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Method of recycling isooctanol from waste solvent in production process of isooctyl thioglycolate

A technology of isooctyl thioglycolate and isooctyl acetate, applied in the field of chemical separation, can solve the problems of high boiling point, inability to realize distillation operation, low content of thioglycolic acid, etc., and achieve high product purity, reduced energy consumption, and stable product quality Effect

Inactive Publication Date: 2016-07-13
NANJING NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The content of thioglycolic acid in the mixture is small and the boiling point is high, so it cannot be distilled at low temperature. Therefore, it is necessary to develop a more effective separation process for the mixed system of isooctyl alcohol-thioglycolic acid-water to realize the recycling of this part of resources. use

Method used

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  • Method of recycling isooctanol from waste solvent in production process of isooctyl thioglycolate
  • Method of recycling isooctanol from waste solvent in production process of isooctyl thioglycolate
  • Method of recycling isooctanol from waste solvent in production process of isooctyl thioglycolate

Examples

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Embodiment 1

[0028] Embodiment 1: the method for reclaiming isooctyl alcohol from mercaptoacetic acid-water-isooctanol system in combination with rectification process, with reference to figure 1 Process flow shown. The waste liquid produced in the production process of isooctyl thioglycolate is used as raw material ①, wherein the mass contents of thioglycolic acid, water, and isooctyl alcohol are 4.11%, 1.96%, and 93.93% respectively (the flow rate is 5Kg / h), and raw material ① enters Rectification tower Ⅰ, the temperature of the control tower is 186.1-189.3 ℃, the temperature of the tower top is 95.2-97.5 ℃, the reflux ratio is 3, after rectification separation, the azeotrope of isooctyl alcohol and water is obtained from the top of the rectification tower ② (Flow rate 0.49Kg / h, its composition is X 异辛醇 =0.8002,X 水 =0.1998), and it is passed in the liquid separator 2; The mixed solution ③ (flow rate 4.51Kg / h, its composition is X 异辛醇 =0.9544,X 巯基乙酸 =0.0456) into the reactor 3, with p...

Embodiment 2

[0042] The operation steps adopted are the same as in Example 1, the difference is that the mass content of thioglycolic acid in the waste liquid produced in the production process of the used raw material isooctyl thioglycolate is 5%, the mass content of water is 2.2%, and the mass content of isooctanol was 92.8%.

Embodiment 3

[0044] The operation steps adopted are the same as in Example 1, the difference is that the mass content of thioglycolic acid in the waste liquid produced in the production process of the used raw material isooctyl thioglycolate is 6%, the mass content of water is 2.8%, and the mass content of isooctyl alcohol is 6%. was 91.2%.

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Abstract

The invention discloses a method of recycling isooctanol from waste solvent in the production process of isooctyl thioglycolate.The method includes: adopting a method of combining reaction with distillation separation, separating raw materials through a distillation tower I, obtaining an azeotrope of isooctanol and water at the top of the tower I, and enabling thioglycolic acid and isooctanol mixed liquid obtained at the bottom of the tower I to enter a reaction kettle for reaction; enabling a mixture of isooctyl thioglycolate, water and isooctanol enter a distillation tower II for separaton, obtaining an azeotrope of isooctanol and water obtained at the top of the tower II, enabling a mixture of isooctyl thioglycolate and icooctyl obtained at the bottom of the tower II to enter a distillation tower III for separation, obtaining isooctyl at the top of the tower III, and obtaining isooctyl thioglycolate at the bottom of the tower III; subjecting products at the tops of the distillation tower I, the distillation tower II and the distillation tower III to liquid separation to obtain isooctyl thioglycolate for recycling.Compared with conventional methods, the method has the advantages of more remarkable separation effect, higher product purity and higher recycling rate.

Description

technical field [0001] The invention relates to a method for chemical separation, in particular to a method for recovering isooctyl alcohol from waste solvents in the production process of isooctyl thioglycolate in combination with a rectification process. Background technique [0002] Isooctyl thioglycolate is a fine chemical product widely used in the fields of pesticides, pharmaceuticals, and synthesis of organic intermediates. This product is synthesized by esterification reaction with thioglycolic acid and isooctyl alcohol as raw materials. During the production process, a large amount of mixed waste solvents containing isooctyl alcohol, thioglycolic acid and water will be produced. It is necessary to adopt a suitable process to realize the recovery of this part of waste solvent. Recycle and reduce waste generation. [0003] The content of thioglycolic acid in the mixture is small and the boiling point is high, so it cannot be distilled at low temperature. Therefore, i...

Claims

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Application Information

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IPC IPC(8): C07C29/82C07C31/125C07C323/52C07C319/28
CPCC07C29/82C07C31/125C07C319/28C07C323/52
Inventor 林军李星苏佳伟赫斌徐伟汤良燕
Owner NANJING NORMAL UNIVERSITY
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