In recent years, China's Adipic Acid demand is strong, domestic production can not meet the market demand, so every year from abroad a large number of imports. Adipic acid two octyl ester manufacturers xiao bian today with you to understand the use of Adipic Acid related to the introduction! Adipic acid, also known as fatty acid, white crystalline or crystalline powder, is an important organic dihydric acid.

Dioctyl Adipic Acid manufacturer introduces the main uses of Adipic Acid

Adipic Acid is primarily used as a raw material for nylon 66 and engineering plastics, but is also used in the production of various esters, as a raw material for polyurethane elastomers and as an acidifying agent for various foods and beverages, sometimes even more than citric and tartaric acid.

Adipic Acid is also used in medicine, yeast purification, pesticides, adhesives, synthetic leather, synthetic dyes and spices.

Adipic Acid is a good pH regulator with a mild and persistent sour taste and little pH change over a wide concentration range. According to GB2760-2007, the maximum content of solid beverage is 0.01g/kg; It can also be used in jelly and jelly powder. The maximum dosage of jelly is 0.01g/kg. When used for jelly powder, the amount can be increased according to the punching machine.

Dioctyl adipate manufacturer introduces the preparation method of Adipic Acid

In 1937, DuPont oxidized cyclohexanol with nitric acid (through hydrogenation production of phenol), and realized the industrial production of Adipic Acid for the first time. In the 1960s, the industry gradually adopted cyclohexane oxidation, that is, first from cyclohexane to the intermediate cyclohexanone and cyclohexanol mixture (that is, ketol oil, also known as KA oil), and then with nitric acid or air oxidation of KA oil.

One step oxidation of cyclohexane

Using cyclohexane as raw material, acetic acid as solvent, cobalt and bromide as catalyst, 2MP was prepared. Reaction at 90℃ 10? 13 h. Yield 75%.

Step oxidation of cyclohexane

KA oil can be at 1.0? 2.5 MPa, 145? It is directly oxidized by air at 180℃ with a yield of 70%. 75%. Metaborate can also be used as a catalyst. Air oxidation can be achieved at 1.0? At 2.0MPa and 165℃. The yield can reach 90%, and the ratio of alcohol to ketone is 10∶1. The reactants are treated with hot water, the esters are hydrolyzed and stratified, the boric acid is recovered through the water layer, and the boric acid is formed by dehydration to form part of the boric acid for recycling. In the organic layer, the organic ester is saponified with caustic soda, the acid is removed, and cyclohexane is recovered by distillation.

The oxidation of KA oil was carried out in a two-stage series reactor at a reaction temperature of 60? 80 ℃, 0.1? 0.4 MPa, in which the content of nitric acid is 50%? 60%. The catalyst is a copper-vanadium series (copper 0.1%? 0.5%, 0.1% vanadium? 0.2%), the yield is 92% of the theoretical value. 96%. High purity Adipic Acid can be obtained by two crystallization after nitric acid is evaporated from the reactant.