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How does bleaching powder bleach a fibre textile?

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  • Release Time:2020-10-28 17:34
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【Summary】 Artificial fiber and natural fibers are essentially the same, easy to color like cotton, hemp, silk and wool, hence the brilliant colors of rayon and rayon. However, the dyeing of synthetic fibers is quite different. Only polyamide has similar molecules and proteins, and the dye is similar to silk and wool. Dacron, polypropylene, chloroprene and so on are very difficult to dye, because they do not touch the dye, do not hook, mordant does not adhere to. The dye had to be mixed into the material prior to the spinning, and the colored silk was ejected to give the fabric color. Conversely, to whiten the cloth, bleach is used to destroy the dye molecules. So do you know how bleaching powder works? An experiment has been performed in which a bunch of red roses are pinned under a glass bell jar and a burning sulfur is sent inside. After a while, the color of the rose faded. This is the sulfur dioxide generated by burning sulfur and the water molecules in the rose to produce sulfurous acid, which has the reducibility and destroys the pigment of the rose. White cloth, paper and straw hats are often bleached with sulfurous acid. However, oxygen in the air slowly oxidizes back the reduced pigment, so that old white cloth, white paper and straw hats often turn yellow. Reduction can destroy pigment and achieve bleaching; Oxidation can also destroy pigments and achieve bleaching. The main component of bleach is calcium hypochlorite, which dissolves in water and releases hypochlorite. Hypochlorous acid has a strong oxidizing power. The dye molecules are oxidized by it, turning them into colorless compounds, and the bleaching takes place. When Scheele discovered chlorine in 1774, he discovered that chlorine water was a permanent bleaching agent for paper, vegetables and flowers. In 1785, The French chemist Bertolay proposed the application of bleaching to production, and noticed that the solution of chlorine-lime water was thicker than chlorine-water, the bleaching power was stronger, and there was no harmful effect of chlorine escaping. In 1789, The British chemist Lloyd Tenet dissolved chlorine in lime milk to make bleach. Bleaching powder is still made by passing chlorine into lime, which contains a little less than 1% water, because extremely dry lime does not react with chlorine. The reaction process of bleaching powder production is relatively complex, and the main reaction can be expressed as follows: Cl2 Ca (OH) 2 + 2 = 3 Ca (ClO) 2 + CaCl2 · Ca (OH) 2 · H2O + H2O In more advanced bleach, chlorination can be carried out according to the following chemical equation, and the reaction is relatively complete: Cacl2 · Ca (OH) 2 · 2 H2O + 2 cl2 H2O + 8 = Ca (ClO) 2 + 3 cacl2 · 4 H2O Bleach is a mixture whose active ingredient is Ca(ClO)2. Commodity bleach often contains impurities such as Ca(OH)2, CaCl2, Ca(ClO2)2 and Cl2. Calcium hypochlorite is very unstable (but more stable than hypochlorite) and reacts with water as follows: Ca (ClO) 2 + 2 h2o Ca (OH) 2 + 2 = hclo As alkalinity increased in the solution, the bleaching process proceeded slowly. Ca(OH)2 must be removed in order to produce a bleaching effect in a short time, so industrial bleaching powder is used by adding a small amount of weak acid, such as acetic acid, or a small amount of dilute hydrochloric acid. There is no need to add acid to household bleach, since carbon dioxide from the air ACTS as a weak acid when dissolved in water: Ca(ClO)2+H2O+CO2 = CaCO3↓+2HClOCa(ClO)2+2H2O+2CO2 = Ca(HCO3)2+2HClO

How does bleaching powder bleach a fibre textile?

【Summary】

Artificial fiber and natural fibers are essentially the same, easy to color like cotton, hemp, silk and wool, hence the brilliant colors of rayon and rayon.

However, the dyeing of synthetic fibers is quite different.

Only polyamide has similar molecules and proteins, and the dye is similar to silk and wool.

Dacron, polypropylene, chloroprene and so on are very difficult to dye, because they do not touch the dye, do not hook, mordant does not adhere to.

The dye had to be mixed into the material prior to the spinning, and the colored silk was ejected to give the fabric color.

Conversely, to whiten the cloth, bleach is used to destroy the dye molecules.

So do you know how bleaching powder works?

An experiment has been performed in which a bunch of red roses are pinned under a glass bell jar and a burning sulfur is sent inside.

After a while, the color of the rose faded.

This is the sulfur dioxide generated by burning sulfur and the water molecules in the rose to produce sulfurous acid, which has the reducibility and destroys the pigment of the rose.

White cloth, paper and straw hats are often bleached with sulfurous acid.

However, oxygen in the air slowly oxidizes back the reduced pigment, so that old white cloth, white paper and straw hats often turn yellow.

Reduction can destroy pigment and achieve bleaching;

Oxidation can also destroy pigments and achieve bleaching.

The main component of bleach is calcium hypochlorite, which dissolves in water and releases hypochlorite.

Hypochlorous acid has a strong oxidizing power.

The dye molecules are oxidized by it, turning them into colorless compounds, and the bleaching takes place.

When Scheele discovered chlorine in 1774, he discovered that chlorine water was a permanent bleaching agent for paper, vegetables and flowers.

In 1785, The French chemist Bertolay proposed the application of bleaching to production, and noticed that the solution of chlorine-lime water was thicker than chlorine-water, the bleaching power was stronger, and there was no harmful effect of chlorine escaping.

In 1789, The British chemist Lloyd Tenet dissolved chlorine in lime milk to make bleach.

Bleaching powder is still made by passing chlorine into lime, which contains a little less than 1% water, because extremely dry lime does not react with chlorine.

The reaction process of bleaching powder production is relatively complex, and the main reaction can be expressed as follows:

Cl2 Ca (OH) 2 + 2 = 3 Ca (ClO) 2 + CaCl2 · Ca (OH) 2 · H2O + H2O

In more advanced bleach, chlorination can be carried out according to the following chemical equation, and the reaction is relatively complete:

Cacl2 · Ca (OH) 2 · 2 H2O + 2 cl2 H2O + 8 = Ca (ClO) 2 + 3 cacl2 · 4 H2O

Bleach is a mixture whose active ingredient is Ca(ClO)2.

Commodity bleach often contains impurities such as Ca(OH)2, CaCl2, Ca(ClO2)2 and Cl2.

Calcium hypochlorite is very unstable (but more stable than hypochlorite) and reacts with water as follows:

Ca (ClO) 2 + 2 h2o Ca (OH) 2 + 2 = hclo

As alkalinity increased in the solution, the bleaching process proceeded slowly.

Ca(OH)2 must be removed in order to produce a bleaching effect in a short time, so industrial bleaching powder is used by adding a small amount of weak acid, such as acetic acid, or a small amount of dilute hydrochloric acid.

There is no need to add acid to household bleach, since carbon dioxide from the air ACTS as a weak acid when dissolved in water:

Ca(ClO)2+H2O+CO2 = CaCO3↓+2HClOCa(ClO)2+2H2O+2CO2 = Ca(HCO3)2+2HClO

  • Categroy:News
  • Author:
  • Origin:
  • Release Time:2020-10-28 17:34
  • Views:
Information

Artificial fiber and natural fibers are essentially the same, easy to color like cotton, hemp, silk and wool, hence the brilliant colors of rayon and rayon.

However, the dyeing of synthetic fibers is quite different.

Only polyamide has similar molecules and proteins, and the dye is similar to silk and wool.

Dacron, polypropylene, chloroprene and so on are very difficult to dye, because they do not touch the dye, do not hook, mordant does not adhere to.

The dye had to be mixed into the material prior to the spinning, and the colored silk was ejected to give the fabric color.

Conversely, to whiten the cloth, bleach is used to destroy the dye molecules.

So do you know how bleaching powder works?

An experiment has been performed in which a bunch of red roses are pinned under a glass bell jar and a burning sulfur is sent inside.

After a while, the color of the rose faded.

This is the sulfur dioxide generated by burning sulfur and the water molecules in the rose to produce sulfurous acid, which has the reducibility and destroys the pigment of the rose.

White cloth, paper and straw hats are often bleached with sulfurous acid.

However, oxygen in the air slowly oxidizes back the reduced pigment, so that old white cloth, white paper and straw hats often turn yellow.

Reduction can destroy pigment and achieve bleaching;

Oxidation can also destroy pigments and achieve bleaching.

The main component of bleach is calcium hypochlorite, which dissolves in water and releases hypochlorite.

Hypochlorous acid has a strong oxidizing power.

The dye molecules are oxidized by it, turning them into colorless compounds, and the bleaching takes place.

When Scheele discovered chlorine in 1774, he discovered that chlorine water was a permanent bleaching agent for paper, vegetables and flowers.

In 1785, The French chemist Bertolay proposed the application of bleaching to production, and noticed that the solution of chlorine-lime water was thicker than chlorine-water, the bleaching power was stronger, and there was no harmful effect of chlorine escaping.

In 1789, The British chemist Lloyd Tenet dissolved chlorine in lime milk to make bleach.

Bleaching powder is still made by passing chlorine into lime, which contains a little less than 1% water, because extremely dry lime does not react with chlorine.

The reaction process of bleaching powder production is relatively complex, and the main reaction can be expressed as follows:

Cl2 Ca (OH) 2 + 2 = 3 Ca (ClO) 2 + CaCl2 · Ca (OH) 2 · H2O + H2O

In more advanced bleach, chlorination can be carried out according to the following chemical equation, and the reaction is relatively complete:

Cacl2 · Ca (OH) 2 · 2 H2O + 2 cl2 H2O + 8 = Ca (ClO) 2 + 3 cacl2 · 4 H2O

Bleach is a mixture whose active ingredient is Ca(ClO)2.

Commodity bleach often contains impurities such as Ca(OH)2, CaCl2, Ca(ClO2)2 and Cl2.

Calcium hypochlorite is very unstable (but more stable than hypochlorite) and reacts with water as follows:

Ca (ClO) 2 + 2 h2o Ca (OH) 2 + 2 = hclo

As alkalinity increased in the solution, the bleaching process proceeded slowly.

Ca(OH)2 must be removed in order to produce a bleaching effect in a short time, so industrial bleaching powder is used by adding a small amount of weak acid, such as acetic acid, or a small amount of dilute hydrochloric acid.

There is no need to add acid to household bleach, since carbon dioxide from the air ACTS as a weak acid when dissolved in water:

Ca(ClO)2+H2O+CO2 = CaCO3↓+2HClOCa(ClO)2+2H2O+2CO2 = Ca(HCO3)2+2HClO

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Difference between calcium hypochlorite and bleaching powder
Difference between calcium hypochlorite and bleaching powder
1. What is Calcium hypochlorite? The main components of bleaching powder commonly used in aquaculture are calcium chloride and calcium hypochlorite. Among them: the effective component of bleaching powder that plays a role in disinfection is calcium hypochlorite [ca (CLO) 2], and calcium chloride is a chemical substance that will obviously absorb moisture. Due to the existence of calcium chloride in bleaching powder, the available chlorine in bleaching powder is easily affected and reduced. Because calcium hypochlorite is the essence of bleaching powder, calcium hypochlorite is also called bleaching powder essence in the market. Compared with bleaching powder, it is pure calcium hypochlorite essence and does not contain calcium chloride and other hygroscopic substances. The chlorine content is about 68%, which is significantly higher than the effective chlorine content of the newly produced non damped bleaching powder. Generally, the disinfection dose is only 0.1~0.2ppm. In aquaculture and other industries that need disinfection and oxidation, disinfectants that dissolve in water and produce hypochlorite are generally referred to as chlorine containing disinfectants. The germicidal efficacy of chlorine containing disinfectants is closely related to the amount of effective chlorine they contain. The higher the effective chlorine, the stronger the disinfection and oxidation capacity. 2. Comparison of advantages and disadvantages between bleaching powder and calcium hypochlorite Advantages of bleach: It is cheap and has obvious effect on general pathogenic microorganisms. Disadvantages of bleach: Due to the strong water absorption of calcium chloride contained in bleaching powder, it is easy to decompose when exposed to light, water, heat, etc., and is not resistant to storage. Especially in humid areas, the available chlorine of bleaching powder will decrease exponentially in about a month. Even lead to the loss of proper disinfection effect. The principle of bleaching powder deterioration: Calcium chloride in bleaching powder absorbs water and makes calcium hypochlorite in bleaching powder generate hypochlorite.   3. Hypochlorous acid will decompose into hydrogen chloride and oxygen under light conditions, thus losing effective chlorine. Advantages of calcium hypochlorite: contains very little hygroscopic calcium chloride, so calcium hypochlorite is relatively stable and resistant to storage and transportation (which is very important to ensure the disinfection effect). Compared with bleaching powder, the available chlorine of calcium hypochlorite is stable and high, which has obvious effect on general pathogenic microorganisms. The amount of use in disinfection is small, which reduces the amount of labor. Disadvantages of calcium hypochlorite: Since calcium hypochlorite contains a large amount of effective chlorine, protective measures need to be taken during operation.
See more information
1. What is Calcium hypochlorite? The main components of bleaching powder commonly used in aquaculture are calcium chloride and calcium hypochlorite. Among them: the effective component of bleaching powder that plays a role in disinfection is calcium hypochlorite [ca (CLO) 2], and calcium chloride is a chemical substance that will obviously absorb moisture. Due to the existence of calcium chloride in bleaching powder, the available chlorine in bleaching powder is easily affected and reduced. Because calcium hypochlorite is the essence of bleaching powder, calcium hypochlorite is also called bleaching powder essence in the market. Compared with bleaching powder, it is pure calcium hypochlorite essence and does not contain calcium chloride and other hygroscopic substances. The chlorine content is about 68%, which is significantly higher than the effective chlorine content of the newly produced non damped bleaching powder. Generally, the disinfection dose is only 0.1~0.2ppm. In aquaculture and other industries that need disinfection and oxidation, disinfectants that dissolve in water and produce hypochlorite are generally referred to as chlorine containing disinfectants. The germicidal efficacy of chlorine containing disinfectants is closely related to the amount of effective chlorine they contain. The higher the effective chlorine, the stronger the disinfection and oxidation capacity. 2. Comparison of advantages and disadvantages between bleaching powder and calcium hypochlorite Advantages of bleach: It is cheap and has obvious effect on general pathogenic microorganisms. Disadvantages of bleach: Due to the strong water absorption of calcium chloride contained in bleaching powder, it is easy to decompose when exposed to light, water, heat, etc., and is not resistant to storage. Especially in humid areas, the available chlorine of bleaching powder will decrease exponentially in about a month. Even lead to the loss of proper disinfection effect. The principle of bleaching powder deterioration: Calcium chloride in bleaching powder absorbs water and makes calcium hypochlorite in bleaching powder generate hypochlorite.   3. Hypochlorous acid will decompose into hydrogen chloride and oxygen under light conditions, thus losing effective chlorine. Advantages of calcium hypochlorite: contains very little hygroscopic calcium chloride, so calcium hypochlorite is relatively stable and resistant to storage and transportation (which is very important to ensure the disinfection effect). Compared with bleaching powder, the available chlorine of calcium hypochlorite is stable and high, which has obvious effect on general pathogenic microorganisms. The amount of use in disinfection is small, which reduces the amount of labor. Disadvantages of calcium hypochlorite: Since calcium hypochlorite contains a large amount of effective chlorine, protective measures need to be taken during operation.
Calcium hypochlorite Market Overview
Calcium hypochlorite Market Overview
Time of issue : 2024-04-15 16:52:27
Market Overview It is estimated to reach USD 1,808.11 million by 2031, growing at a CAGR of 11.13% over the forecast period (2023–2031). Market growth is anticipated to be driven by the rising demand for calcium hypochlorite in the coming years, driven by the rising usage of hygiene products to prevent water-borne diseases like cholera and typhoid.   Calcium hypochlorite is an inorganic compound utilized as a component in chlorine powder and bleaching powder, among other applications. It undergoes gradual decomposition in humid air and emits a potent chlorine odor. Calcium hypochlorite overuse can be harmful and irritate the skin. It has extensive applications in the disinfection of swimming pools, water purification, and bleaching textiles and paper. Calcium hypochlorite must be stored away from organic materials such as cloth, wood, and petroleum products since it can cause an explosion or fire when reacted.   Calcium hypochlorite is mainly used to disinfect drinking water and public swimming pools. The surging usage of calcium hypochlorite in spas, hot tub water, and swimming pools is anticipated to positively impact the growth of the calcium hypochlorite market worldwide. It is used as an oxidizer for decontaminating mustard gas and as a pesticide for insects, especially caterpillars. Calcium hypochlorite is also used to kill bacteria in different food products. It is utilized to sanitize the surfaces of different equipment and utensils. In households, calcium hypochlorite is commonly used in algaecides, bathroom cleaners, herbicides, household disinfectant sprays, laundry detergents, etc.
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Market Overview It is estimated to reach USD 1,808.11 million by 2031, growing at a CAGR of 11.13% over the forecast period (2023–2031). Market growth is anticipated to be driven by the rising demand for calcium hypochlorite in the coming years, driven by the rising usage of hygiene products to prevent water-borne diseases like cholera and typhoid.   Calcium hypochlorite is an inorganic compound utilized as a component in chlorine powder and bleaching powder, among other applications. It undergoes gradual decomposition in humid air and emits a potent chlorine odor. Calcium hypochlorite overuse can be harmful and irritate the skin. It has extensive applications in the disinfection of swimming pools, water purification, and bleaching textiles and paper. Calcium hypochlorite must be stored away from organic materials such as cloth, wood, and petroleum products since it can cause an explosion or fire when reacted.   Calcium hypochlorite is mainly used to disinfect drinking water and public swimming pools. The surging usage of calcium hypochlorite in spas, hot tub water, and swimming pools is anticipated to positively impact the growth of the calcium hypochlorite market worldwide. It is used as an oxidizer for decontaminating mustard gas and as a pesticide for insects, especially caterpillars. Calcium hypochlorite is also used to kill bacteria in different food products. It is utilized to sanitize the surfaces of different equipment and utensils. In households, calcium hypochlorite is commonly used in algaecides, bathroom cleaners, herbicides, household disinfectant sprays, laundry detergents, etc.
Pros of Calcium Hypochlorite
Pros of Calcium Hypochlorite
Time of issue : 2024-04-09 10:13:04
Calcium hypochlorite is a white, concentrated chemical sold as a powder, as crystals and in tablets. All are used to disinfect and sanitize drinking water and swimming pool water. When combined with water, calcium hypochlorite releases oxygen and a high concentration of chlorine molecules. Chlorine is an effective way to kill bacterial and fungal populations in water sources, and, compared with other sources of chlorine for water purification, it is easier and safer to use. However, there are some downsides to be aware of in calcium hypochlorite use. Cost Effectiveness One of the primary benefits of calcium hypochlorite is that a relatively small amount of the chemical can successfully disinfect large amounts of water, making it one of the most cost-effective choices in water sanitation. According to Survivaltopics.com, a site devoted to providing readers information about surviving outdoors and during emergency situations, a 1-lb. bag of calcium hypochlorite in granular form can treat up to 10,000 gallons of water. Ease of Use Although using chlorine as a water disinfectant is generally simple and efficient, calcium hypochlorite is preferred over the other common forms of chlorine water treatment–chlorine gas and liquid bleach (also known as sodium hypochlorite)–because it is more stable, requires less equipment to use and is easier to transport. Chlorine gas is highly effective but must be handled with extreme care because of its hazardous, corrosive nature. Liquid bleach is most useful when treating only small amounts of water. By contrast, calcium hypochlorite is safer to handle than chlorine gas and can be used on much larger volumes of water than bleach. Length of Storage Another benefit of calcium hypochlorite is that it can be stored for long periods of time without any of its disinfectant ability diminishing. Other forms of chlorine, such as liquid bleach, degrade in a matter of months. In order to be certain that your bleach has the optimal level of chlorine, a representative of Clorox says, you should change your supply of bleach every three months. Length of Storage Another benefit of calcium hypochlorite is that it can be stored for long periods of time without any of its disinfectant ability diminishing. Other forms of chlorine, such as liquid bleach, degrade in a matter of months. In order to be certain that your bleach has the optimal level of chlorine, a representative of Clorox says, you should change your supply of bleach every three months.  
See more information
Calcium hypochlorite is a white, concentrated chemical sold as a powder, as crystals and in tablets. All are used to disinfect and sanitize drinking water and swimming pool water. When combined with water, calcium hypochlorite releases oxygen and a high concentration of chlorine molecules. Chlorine is an effective way to kill bacterial and fungal populations in water sources, and, compared with other sources of chlorine for water purification, it is easier and safer to use. However, there are some downsides to be aware of in calcium hypochlorite use. Cost Effectiveness One of the primary benefits of calcium hypochlorite is that a relatively small amount of the chemical can successfully disinfect large amounts of water, making it one of the most cost-effective choices in water sanitation. According to Survivaltopics.com, a site devoted to providing readers information about surviving outdoors and during emergency situations, a 1-lb. bag of calcium hypochlorite in granular form can treat up to 10,000 gallons of water. Ease of Use Although using chlorine as a water disinfectant is generally simple and efficient, calcium hypochlorite is preferred over the other common forms of chlorine water treatment–chlorine gas and liquid bleach (also known as sodium hypochlorite)–because it is more stable, requires less equipment to use and is easier to transport. Chlorine gas is highly effective but must be handled with extreme care because of its hazardous, corrosive nature. Liquid bleach is most useful when treating only small amounts of water. By contrast, calcium hypochlorite is safer to handle than chlorine gas and can be used on much larger volumes of water than bleach. Length of Storage Another benefit of calcium hypochlorite is that it can be stored for long periods of time without any of its disinfectant ability diminishing. Other forms of chlorine, such as liquid bleach, degrade in a matter of months. In order to be certain that your bleach has the optimal level of chlorine, a representative of Clorox says, you should change your supply of bleach every three months. Length of Storage Another benefit of calcium hypochlorite is that it can be stored for long periods of time without any of its disinfectant ability diminishing. Other forms of chlorine, such as liquid bleach, degrade in a matter of months. In order to be certain that your bleach has the optimal level of chlorine, a representative of Clorox says, you should change your supply of bleach every three months.  
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