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Benzoyl peroxide | CAS 94-36-0 - Haihang Industry

Oct. 26, 2018
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Dibenzoyl peroxid, Benzoyl peroxide, Benzoyl superoxide, the common name initiator BPO. Benzoyl peroxide is a white crystalline powder at room temperature, slightly bitter almond odor, soluble in benzene, chloroform and ether. Slightly soluble in ethanol and water. It is used as a monomer polymerization initiator for polyvinyl chloride, unsaturated polyesters, polyacrylates, etc., and can also be used as a crosslinking agent for polyethylene, and can also be used as a rubber vulcanizing agent. Dibenzoyl peroxide is a strong oxidizing agent that is easily burned. The nature is extremely unstable. Friction, impact, encounter with bright light, high temperature, sulfur and reducing agent all cause fire and explosion. When sulfuric acid is added, it can also cause combustion. In order to prevent an explosion, it is generally used when it is diluted to about 20% with an insoluble salt such as calcium carbonate, calcium phosphate or calcium sulfate, or talc or bentonite. Or inject 25-30% of water when storing. Dibenzoyl peroxide is low in toxicity, harmful to use, and irritating to eyes, skin and mucous membranes. Direct contact should be avoided. The molecular formula is C14H10O4.


English synonym: Benzaknen;Benzaknew;Benzamycin;Benzoic acid, peroxide;benzoicacid,peroxide;benzoicacidperoxide;Benzol peroxide;Benzoyl

Benzoyl peroxide Typical Properties


Item

Specifications

Appearance

White powder

Purity (Dried)

≥98.00%

Purity (Wet)

75%~77%

Water content

23%-25%

Chlorinity

≤0.1%

Free acid

≤0.5%

Melting point

102~106



Main uses of dibenzoyl peroxide


Dibenzoyl peroxide is the most widely used initiator in polymerization. It is mainly used as solvent polymerization of PVC, polyacrylonitrile, acrylate, vinyl acetate, graft polymerization of neoprene, SBS and methyl methacrylate. An unsaturated polyester resin, an initiator such as a plexiglass adhesive, or a crosslinking agent. Used as a vulcanizing agent and cross-linking agent for silicone rubber and fluororubber in the rubber industry. It can also be used as a bleaching agent or oxidizing agent in chemical production. It is forbidden to add benzoyl peroxide or calcium peroxide to flour production. Food additive manufacturers are not allowed to produce or sell food additives such as calcium peroxide and benzoyl peroxide.


Benzoyl peroxide is widely used in foods and cosmetics and has not been banned in China.

Benzoyl peroxide:

Currently the most effective over-the-counter fungicide for the treatment of acne. Benzoyl peroxide can penetrate into the pores and kill P. acnes, which causes acne, and the skin is stimulated very little. Unlike other antibiotics, it does not develop resistance.

Recent studies have found that benzoyl peroxide is better for acne than some prescription drugs such as oral and topical antibiotics.



This treatment for acne, inflammation and non-inflammatory acne.


There are very few brands in China, only ointments, including in Taiwan, only as ointments, such as Panya gel, Yaruo gel, in addition to Proactiv this brand is useful.

The most common side effects of benzoyl peroxide are: high irritation, heat, itching, and severe edema, so it is recommended to use it gradually from a low concentration.

In addition, although benzoic acid can also make the keratin dry and peel off, reduce the problem of acne, but it is not recommended to use it to rub acne, it is safer to use only on acne.


Instructions:

Use a cotton swab, or a little bit of your finger, and place it on the acne; don't rub it with a lotion.

Excessive use of benzene is easy to cause redness and swelling, so slowly increase the use from a small amount, can not be applied to the acne at the beginning.


Method for producing benzoyl peroxide


Hydrogen peroxide having a concentration of 30% was added to a 30% sodium hydroxide solution under cooling to form an aqueous sodium peroxide solution. Then, benzoyl chloride is added dropwise at 0 to 10 ° C, and the resulting benzoyl peroxide is precipitated, cooled, filtered, washed, and recrystallized with 2:1 methanol/chloroform, dried (50-70 ° C) to obtain a product. The yield is above 85%, and the chemical reaction formula is as follows:


2NaOH+H2O2→Na2O2 + 2H2O

Na2O2+2C6H5COCl→C6H5COOOOC6H5+2NaCl


Industrial products have a benzoyl peroxide content of up to 99% (second grade), a melting point of 102-106 ° C raw material consumption quota: benzoyl chloride (95% or more) 1000 kg / t, hydrogen peroxide (30%) 800 kg / t. When purification is required, it may be recrystallized with an alcohol, acetone, benzene, and other suitable solvents.


Stability of dibenzoyl peroxide


Dibenzoyl peroxide is a strong oxidizing agent that is easily burned. The nature is extremely unstable. Friction, impact, encounter with bright light, high temperature, sulfur and reducing agent all cause the danger of fire and explosion. When sulfuric acid is added, it can also cause combustion. In order to prevent an explosion, it is generally used when it is diluted to about 20% with an insoluble salt such as calcium carbonate, calcium phosphate or calcium sulfate, or talc or bentonite. Or store 25-30% water when storing.


Toxicity and environmental impact


Dibenzoyl peroxide is low in toxicity, harmful to use, and irritating to eyes, skin and mucous membranes. Direct contact should be avoided.


Packaging, storage and transportation of dibenzoyl peroxide


The dry dibenzoyl peroxide product is contained in a polyethylene paper bag or a fiber-reinforced barrel or in a metal drum lined with polyethylene. Store in a separate warehouse that is cool, ventilated, dry, protected from light, and made of non-combustible materials. Install explosion-proof ventilators (explosion-proof holes) in a safe direction. Do not install electrical equipment or heating facilities indoors. It must be stored and taken in the original packaging container, and must not be modified to avoid danger. 30% water should be added for storage to ensure safety. Shading, sealed and stored, must store certain moisture when stored. When transporting, the container must be marked with “organic peroxide” mark. It should be handled gently and gently. It is strictly prohibited to knock or hit. It is strictly prohibited to mix and store with reducing agent and flammable organic matter.


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