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Raw materials And Preparation Products

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Questions And Answer

• The main method of preparation

  (1) Castor oil is as raw material, ricinoleate is separated from castor oil, with the condition of inflating and 280~300℃, caustic soda proceeds alkali fusion and the reaction is heated for 10h, sebum acid sodium salt can obtain, deputy product is 2-octanol. The sodium salt is dissolved in water, adding sulfuric acid to neutralize, after bleaching, the solution is cooled to precipitate sebum acid, it is washed with cold water, and finally recrystallized.
  CH3 (CH2) 5CH (OH) CH2CH = CH (CH2) 7COOH +
  2NaOH → CH3 (CH2) 5CH (OH) CH3 + NaOOC (CH2) 8COONa + H2
  NaOOC (CH2) 3COONa + H2SO4 → HOOC (CH2) 8COOH + Na2SO4
  (2) Adipic acid (hexane diacid) is as raw material to synthesize. Adipic acid and methanol can proceed esterification reaction to form dimethyl adipate, ion exchange membrane proceeds electrolytic oxidation to get dimer, i.e., dimethyl sebacate, and then reacts with sodium hydroxide to form the disodium salt, hydrochloric acid (or sulfuric acid) is used to neutralize and Sebacic acid can obtain.
  Chemical properties, uses and methods of preparation of sebacic acid are edited by Chemicalbook andy.（2016-12-04）;

• Chemical properties

  It is white flaky crystal. It is slightly soluble in water, soluble in alcohol and ether.;

• Uses

  Sebacic acid is widely used in the preparation of sebacic acid esters, such as dibutyl sebacate, dioctyl sebacate, diisooctyl sebacate. These esters can be used as plasticizers for plastics and cold-resistant rubber, as well as for polyamide, polyurethane, alkyd resin, synthetic lubricating oil, lubricating oil additives, spices, coatings, cosmetics, etc. It can also be used as raw material for producing nylon 1010, nylon 910, nylon 810, nylon 610, nylon 9 and high temperature resistant lubricating oil diethylhexyl ester. It is also the raw material for the production of alkyd resins (used as surface coatings, plasticized nitrocellulose coatings, and urea resin varnishes) and polyurethane rubber, cellulose resins, vinyl resins, and synthetic rubber plasticizers, softeners, and solvents.

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• Production method

  Almost all of the current industrial production of sebacic acid is using castor oil as raw material.
  Castor oil cracking method: castor oil is heated under the action of alkali hydrolysis to generate ricinoleic acid sodium soap, and then add sulfuric acid acid to generate ricinoleic acid; in the presence of diluent cresol, add alkali heated to 260-280 ℃ for cracking to generate sebacic acid double sodium salt and secoctanol and hydrogen, cracked material diluted by water, heated and neutralized with acid, the double sodium salt into a monosodium salt; and then boiled with acid after decolorization of activated carbon neutralization solution. The monosodium salt of sebacic acid is turned into sebacic acid crystals, and then separated and dried to obtain the finished product.;

• Toxicity

  Sebacic acid, also known as 1, 10-decanedioic acid, belongs to aliphatic dibasic acid. Sebacic acid was present in the leaves of flue-cured tobacco, burley tobacco and aromatic tobacco. Sebacic acid was white crystal in flake form at room temperature. Slightly soluble in water, sebacic acid was insoluble in benzene, petroleum ether, carbon tetrachloride. In contrast, sebacic acid was soluble in ethanol and ethyl ether. Irritant to the eyes, respiratory system and skin irritation, sebacic acid oral harmful. However, sebacic acid was low toxic and flammable.

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• Hazards & Safety Information

  Category: Flammable liquid
  Toxicity: grading toxicity
  Acute oral toxicity-rat LD50: 14375 mg/kg; Oral-Mouse LD50: 6000 mg/kg
  Flammability hazard characteristics: flammable, the fire discharges acrid smoke
  Storage characteristics: Treasury ventilation low-temperature drying
  Extinguishing agent: Dry powder, foam, sand, water;

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