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Method for recovering isooctyl thioglycolate from cauldron bottom residues

A technology of isooctyl acetate and bottom liquid, which is applied in the direction of mercaptan preparation and organic chemistry, can solve the problems of cumbersome process, high processing cost and complicated process, and achieve the reduction of pollution, reduction of processing cost and improvement of yield Effect

Inactive Publication Date: 2016-10-12
山东沾化金嘉利化工科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The saponification of the bottom liquid needs to go through processes such as alkaline hydrolysis, separation, and distillation. The process is cumbersome, the process is relatively complicated, and the treatment cost is relatively high. It is accompanied by a certain amount of saponification wastewater, which brings certain costs to the subsequent wastewater treatment. difficulty

Method used

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  • Method for recovering isooctyl thioglycolate from cauldron bottom residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The treatment method of the bottom liquid of isooctyl thioglycolate distillation is formed by reduction reaction of the following raw materials in parts by mass: 20 parts of bottom liquid, 4.0 parts of zinc powder, and 23.0 parts of hydrochloric acid, wherein the concentration of hydrochloric acid is 30%. .

[0032] Wherein, the raffinate is the light brown liquid produced in the distillation process of isooctyl thioglycolate, and its main components are octanol, isooctyl thioglycolate and their oxidation and polymerization products.

[0033] The processing method includes the following steps:

[0034] (1) 4.0 parts of zinc powder are added to 20.0 parts of the raffinate and stirred;

[0035] (2) Add 23.0 parts of hydrochloric acid (30%) dropwise to the solution obtained in step (1) to carry out a reduction reaction, and the dropwise addition time is 1.5 h;

[0036] (3) After the dropwise addition, continue stirring at 20°C for 2.0h;

[0037] (4) Settling and layerin...

Embodiment 2

[0039] The treatment method of isooctyl thioglycolate distillation still bottom residue is formed by reduction reaction of the following raw materials in parts by mass: 22 parts of still bottom residue, 4.0 parts of iron powder, 23.0 parts of sulfuric acid, wherein the concentration of sulfuric acid is 15% ,

[0040] Wherein, the raffinate is the light brown liquid produced in the distillation process of isooctyl thioglycolate, and its main components are octanol, isooctyl thioglycolate and their oxidation and polymerization products.

[0041] The processing method includes the following steps:

[0042] (1) 4.0 parts of iron powder are added to 22.0 parts of the raffinate and stirred;

[0043] (2) Add 23.0 parts of sulfuric acid (15%) dropwise to the solution obtained in step (1) to carry out a reduction reaction for 1.0 hours of dropping time;

[0044] (3) After the dropwise addition, continue stirring at 20°C for 2.0h;

[0045] (4) Settling and layering, separating the or...

Embodiment 3

[0047] The treatment method of isooctyl thioglycolate distillation still bottom residue is formed by reduction reaction of the following raw materials in parts by mass: 25 parts of still bottom residue, 2.0 parts of zinc powder+3.0 parts of iron powder, 30.0 parts of acetic acid, of which The concentration is 30%.

[0048] Wherein, the raffinate is the light brown liquid produced in the distillation process of isooctyl thioglycolate, and its main components are octanol, isooctyl thioglycolate and their oxidation and polymerization products.

[0049] The processing method includes the following steps:

[0050] (1) 2.0 parts of zinc powder and 3.0 parts of iron powder are added to 25.0 parts of the raffinate and stirred;

[0051] (2) Add 30.0 parts of acetic acid (30%) dropwise to the solution obtained in step (1) to carry out reduction reaction, and the dropwise addition time is 1.5h;

[0052] (3) After the dropwise addition, continue stirring at 25°C for 2.0h;

[0053] (4) ...

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Abstract

The invention relates to a method for recovering isooctyl mercaptoacetate from the bottom liquid. 20-30 parts of the bottom liquid, 3-7 parts of metal powder, and 10-50 parts of acid are mixed at 20-30°C. A reduction reaction is carried out, wherein the above raw materials are all measured in parts by mass. The present invention reclaims the method for isooctyl thioglycolate from the raffinate at the bottom of the still, reduces the raffinate at the bottom of the distillation still of isooctyl thioglycolate to isooctyl thioglycolate, obviously improves the yield of isooctyl thioglycolate, and reduces the amount of octyl thioglycolate The pollution brought by the residual liquid to the environment greatly reduces the treatment cost of the bottom of the distillation tank.

Description

technical field [0001] The invention relates to a method for reclaiming isooctyl thioglycolate from bottom liquid. Background technique [0002] Isooctyl thioglycolate is one of the main raw materials for the preparation of ester-based tin heat stabilizers. With the widespread use of ester-based tin heat stabilizers, the demand for isooctyl thioglycolate is constantly increasing. Due to the presence of -SH in isooctyl mercaptoacetate, the chemical properties are extremely unstable, especially in the production rectification process, a large amount of bottom products will be produced, and the generation of bottom products reduces the yield of finished products on the one hand, It also brings great harm to the environment. The main component of the bottom of the kettle is the product of oxidation and polymerization of isooctyl thioglycolate in the process of esterification and distillation, such as: isooctyl monothioethylenediacetate, isooctyl dithioethylenediacetate, so how ...

Claims

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Application Information

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IPC IPC(8): C07C319/06C07C323/52
CPCC07C319/06
Inventor 张广俊王景华崔洪友周子彦胡正岭刘勤学宋峰刘然升
Owner 山东沾化金嘉利化工科技有限公司
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