SU322984A1 - Method of producing 1,10-decanedicarboxylic acid - Google Patents

Description

The invention relates to a process for the preparation of dicarboxylic acids, in particular 1,10-decanedicarboxylic acid, which can be used as a plasticizer. A known method for the preparation of 1,10-decanedicarboxylic acid by cyclododecene ozonolum, which is carried out in a solution of lower monocarboxylic acids with the oxidant HfcBH followed by lOHM decomposition of the rheonolysis products in a stream of oxygen or air at a constant temperature from 80 to. The realization of thermo-oxidative decomposition of ozonolysis products by such crtoco6oM leads to the formation of oxidation by-products of peroxide ozonolysis products, which complicates the process of obtaining acid of required quality due to the necessity of using complex purification methods. The yield of the target product in the known methods does not exceed 70% of the theoretical one. In the proposed method of producing 1,10-decanedicarvoic acid with ozonolium cyclododecene, there are two steps: first, oxidation of the product of ozonolysis with hydrogen peroxide in the presence of hydrated acid catalysts, for example, 1С – 2/8, at a temperature of 50–70 ° C, the second - thermal decomposition (already without oxygen and catalyst) of oxidation products at a temperature of 90-110 ° C. After cooling the solution, the precipitated 1,10-decanedicarboxylic acid is filtered off, washed with water from traces of the solvent and dried. The acid output is at least 98% of the theoretical. The purity of the product is 99.5%. Example 1. 1b, 6g cyclododecene (0.1 mol) is dissolved in 66.4 g of 98% acetic acid. Through the mixture at a rate of 100 l / h, and when air is passed. Ozonized air (ozone content Zves.%) To ozone leakage. This forms 27.2, g (quantitative conversion) of the product of cyclododecene ozonolysis in a solution of 54.4 g of acetic acid. 6 g of acetic acid is carried away

Claims (1)

Claim A method for producing 1,10-decanedicarboxylic acid by ozonolysis of cyclododecene in a lower monocarboxylic acid medium, followed by thermal decomposition of ozonolysis products and isolation of target products in a known manner, characterized in that, in order to increase the yield and purity of the target products, first, ozonolysis products are first decomposed before thermal decomposition treated with hydrogen peroxide, then heated in the presence of a solid acid catalyst, for example KU2 / 8, at a temperature of 50-70 * C. Circulation 443 Subscription Branch of PPP Patent, Uzhgorod, Project 4,