Monthly Archives: July, 2013

About Sebacic acid

Sebacic acid, also known as sebum. Pure white scaly crystal, industrial slightly yellow, mp 134.5 ℃. Mainly castor oil as raw materials, agriculture, forestry chemical products.
Sebacic acid, castor oil was first obtained alkali distillation, after the development of the synthesis methods, is currently being developed alkanes oil fermentation (see fermentation process) made new route sebacic acid. Is widely used on industrial castor oil alkaline hydrolysis of the reaction vessel, the castor oil at 100 ℃ alkaline saponification reaction of castor oil, glycerol and sodium. Castor oil and sodium sulfate was added to generate separated ricinoleic acid, an alkali solution and then with a base, the reaction temperature is 260 ~ 280 ℃, using low or high pressure. Reaction of sebacic acid disodium salt and 2 – octanol and hydrogen. And finally by the acid neutralization, bleaching, crystallization, drying to obtain pure product in 40% overall yield. Sebacic acid Another method is developed by Asahi Chemical Industry adipic acid electrolytic oxidation method, and the higher cost compared to alkaline hydrolysis of castor oil, therefore no large-scale production.
Sebacic acid widely used, mainly used for extracting sebacic acid esters such as dioctyl sebacate can be used for plastics, cold rubber plasticizers, can also be used to prepare polyamides, polyurethanes, alkyd resins, synthetic lubricants, lubricant additives. Poly sebacic acid anhydride epoxy curing agent, and perfume, paints and cosmetics.
The main purpose
As cold plasticizers, resins and nylon and other materials. [2]
Generation method
Natural castor oil or acid monomethyl ester as raw materials.
Safety Phrases
1 inadvertent contact with eyes, rinse immediately with plenty of water and seek medical advice.
2. Wear suitable protective clothing.
Safety Information

Safety Statements: S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S36: Wear suitable protective clothing.
Hazard Symbols: Xi: Irritant
Risk Codes: R36/37/38: the eyes, respiratory tract and skin irritation.
Mainly used sebacate plasticizers and nylon molding resin materials are also used for high-temperature lubricant materials. Its main products are methyl ester, isopropyl ester, butyl, octyl, nonyl ester and benzyl ester, dibutyl sebacate esters are used, and dioctyl sebacate. Sebacic acid plasticizers widely used in PVC, alkyd resins, polyester resins, and polyamide molding resin, because of its low toxicity and high temperature performance, so frequently used for some special purpose resin. Sebacic acid production with a nylon molding resin with high toughness and low moisture absorption, can be processed into many special-purpose products. Sebacic acid, or a rubber softener, surfactant, paint and fragrance raw materials.
Production method
Natural castor oil or acid monomethyl ester as raw materials. Ethylene, carbon tetrachloride can also be obtained by the polymerization of sebacic acid, but the world’s industrial production, almost all of sebacic acid with castor oil as raw material. 1 Castor Oil Castor alkali lysis method under the action of heat hydrolyzed sodium castor oil soap, and then add sulfuric acid solution generating ricinoleic acid; cresol in the presence of a diluent, alkali heated to 260-280 ℃ for cracking generate sebacic acid disodium salt and octanol and hydrogen cell lysate was diluted with water, heating the acid neutralization, the pair into a single sodium salt; reuse active carbon and liquid boil after adding acid, so sebacic acid monosodium salt becomes sebacic acid crystallization, after separation, drying derived products. Consumption of raw materials fixed: castor oil (industrial) 2100kg / t, sulfuric acid (98) 1600kg / t, caustic soda (95) 1200kg / t, p-cresol (industrial) 100kg / t. 2 n-decane oil fermentation method using 200 # solvent oil or 166-182 ℃ separated fractions obtained n-decane to 19-2 Candida lipolytica yeast fermentation of sebacic acid. 3 new method cyclopentanone palladium salt – copper or iron as a catalyst in ethanol, propanol, or other alcohol, solvent, temperature and pressure at 40-60 ℃ relaxation of conditions, the air oxidation of cyclopentene generated cyclopentanone, and then use an iron catalyst oxidation and dimerization is made.

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