Propylene oxide

Description：

Propylene oxide, also known as propylene oxide, methyl ethylene oxide, 1, 2-propylene oxide, is an organic compound, chemical formula C3H6O, is a very important organic compound raw material, is the third largest propylene derivatives after polypropylene and acrylonitrile. Propylene oxide is a colorless ether flavor liquid, low boiling point, flammable, chiral, industrial products are generally racemic mixtures of two enantiomers. Partially miscible with water, miscible with ethanol and ether. Form binary azeotrope with pentane, pentene, cyclopentane, cyclopentene, dichloromethane. Toxic, irritating to mucous membranes and skin, can damage the cornea and conjunctiva, cause respiratory pain, skin burns and swelling, and even tissue necrosis.

Alkane, also known as propylene oxide, methyl ethylene oxide, 1, 2-propylene oxide, is an organic compound, chemical formula C3H6O, is a very important organic compound raw material. Propylene oxide is a colorless ether flavor liquid, low boiling point, flammable, chiral, industrial products are generally racemic mixtures of two enantiomers. Partially miscible with water, miscible with ethanol and ether. Toxic, irritating to mucous membranes and skin, can damage the cornea and conjunctiva, cause respiratory pain, skin burns and swelling, and even tissue necrosis.

Packing:

Propylene oxide can be packed in dry, clean and sealed galvanized iron drums with a net weight of 150kg per barrel, or transported by a special tank truck, which should comply with the relevant safety regulations. Propylene oxide should be stored in a cool, ventilated and dry place below 25 ° C, and should not be directly exposed in the sun and isolated from the fire source.

Application :

① Important petrochemical raw materials, used for the production of polyether, propylene glycol, dimethyl carbonate, surfactant, foaming agent, demulsifier, dressing agents, etc. 

② Polyether polyol is an important raw material for the production of polyurethane foam, thermal insulation materials, elastomers, adhesives and coatings, and various non-ionic surfactants are widely used in petroleum, chemical, pesticide, textile, daily chemical and other industries. 

③ At the same time, propylene oxide is also an important basic chemical raw material.

Propylene oxide can be packed in dry, clean and sealed galvanized iron drums with a net weight of 150kg per barrel, or transported by a special tank truck, which should comply with the relevant safety regulations. Propylene oxide should be stored in a cool, ventilated and dry place below 25 ° C, and should not be directly exposed in the sun and isolated from the fire source.

preparation

The main methods are chlorol and indirect oxidation.

The chlorohydrin process is made from propylene, chlorine gas and water under normal pressure and 60℃ through hypochlorous acid to produce chloropropanol, which is then saponified, condensed and distilled.

The indirect oxidation method is made of ethylbenzene (or isobutane, isopropylbenzene, etc.) by oxidation to produce ethylbenzene hydroperoxide (or tert-butyl hydrogen peroxide, isopropylbenzene hydroperoxide, etc.), which is obtained by epoxidation reaction with propylene in the presence of catalysts such as molybdenum naphthenate.

Electrochemical chlorohydrin method This method uses the aqueous solution of sodium chloride (or potassium chloride, sodium bromide, sodium iodide) to generate chlorine gas and sodium hydroxide by electrolysis. Propylene is introduced into the anode region to generate chloropropanol, and the reaction of chloropropanol and sodium hydroxide in the cathode region to produce propylene oxide.

use

Important raw materials for organic synthesis, used in the manufacture of propylene glycol, propylene alcohol, propanal, synthetic glycerol, organic acids, synthetic resins, foam, plasticizers, surfactants, emulsifiers, wetting agents, detergents, fungicides, fumigants, etc.

security

Propylene oxide is a toxic substance, which can stimulate the skin and mucous membrane, damage the cornea and conjunctiva of the eye, cause pain in the respiratory organs, skin swelling and burning, and even tissue necrosis. Inhalation of its vapor can affect the central nervous system, presenting depression and vomiting, diarrhea, coma, collapse and other symptoms. Mice transoral LD50580mg/kg. The maximum allowable concentration in the air of the workplace is 1mg/m3. Operators should wear gas masks, goggles and protective gloves.

Propylene oxide is a low boiling, flammable liquid, its vapor can spontaneously ignite or explode in the air, should be stored and transported according to the provisions of toxic dangerous goods. Tanks and reactors should be covered with inert gas. The temperature and pressure of the container should be kept below 25℃ and 0.3 mpa. Implement relevant safety measures against fire and explosion. Storage and transportation containers should be made of stainless steel.