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Method for preparing isooctyl thioglycolate by utilizing thionocarbamate tail liquid

A technology of isooctyl thioglycolate and thiourethane, which is applied in the fields of mercaptan preparation and organic chemistry, can solve the problems of unsafe ether treatment, unstable product quality, difficult operation, etc., and achieve outstanding substantive features and products The effect of stable quality and reduced operation steps

Active Publication Date: 2014-07-16
YANTAI HUMON CHEM AUX CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and provide a method for utilizing thiourethane tail liquid to manufacture isooctyl thioglycolate, mainly solve existing technological operation difficulty, long reaction time, high cost, poor product quality Stability and unsafe ether treatment cause environmental pollution and other issues

Method used

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  • Method for preparing isooctyl thioglycolate by utilizing thionocarbamate tail liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Example 1, the thiourethane tail liquid and the xylene extractant are uniformly mixed under normal pressure at a molar ratio of 1:7, and the tail liquid is removed for impurity removal; dilute hydrochloric acid is added for acidification while removing impurities, and the adjustment pH 4 ~5； After the acidification is completed, let it stand for stratification, separate the bottom acidification solution, and keep the xylene extractant in the upper layer for recycling in the original process; under the condition of stirring in the acidification solution, add 1%-2% zinc powder of the weight of the acidification solution to make the acidification solution It is colorless; the esterification liquid is subjected to multi-stage continuous extraction with isooctyl alcohol in the extraction tank, the content of thioglycolic acid in the extraction liquid is 55%-60%, and the content of thioglycolic acid in the tail liquid is ≤0.2%; in the extraction liquid , adding 0.2% benzenesu...

Embodiment 2

[0020] Example 2, the thiourethane tail liquid and the toluene extractant are uniformly mixed under normal pressure at a molar ratio of 1:6 to remove impurities from the tail liquid; while removing impurities, dilute hydrochloric acid is added to acidify and adjust the pH value 4 ~5； After the acidification is completed, let it stand for stratification, separate the bottom acidification solution, and keep the toluene extractant in the upper layer for recycling; under the condition of stirring in the acidification solution, add zinc powder of 1%-2% of the weight of the acidification solution to make the acidification solution reach Colorless; the esterification liquid is subjected to multi-stage continuous extraction with isooctyl alcohol in the extraction tank, the content of thioglycolic acid in the extraction liquid is 55%-60%, and the content of thioglycolic acid in the tail liquid is ≤0.2%; in the extraction liquid, Add 0.02% benzenesulfonic acid catalyst of the weight of ...

Embodiment 3

[0021] Example 3, the thiourethane tail liquid and the dinitrobenzene extractant are uniformly mixed under normal pressure at a molar ratio of 1:8, and the tail liquid is removed; while removing impurities, dilute hydrochloric acid is added for acidification , adjust the pH value to 4 ~5； After the acidification is completed, let it stand for stratification, separate the bottom acidification solution, and keep the dinitrobenzene extractant in the upper layer for recycling; under the condition of stirring in the acidification solution, add zinc powder of 1%-2% of the weight of the acidification solution to make The acidified solution is colorless; the esterified solution is subjected to multi-stage continuous extraction with isooctyl alcohol in the extraction tank, the content of thioglycolic acid in the extraction solution is 55%-60%, and the content of thioglycolic acid in the extraction tail liquid is ≤0.2%; In the liquid, add 0.5% benzenesulfonic acid catalyst of the weight...

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Abstract

The invention discloses a method for producing isooctyl mercaptoacetate by utilizing thiourethane tail liquid, which is characterized in that it includes the process steps of impurity removal acidification, Zn powder decolorization, extraction, rough distillation and rectification, and the impurity removal acid compound is First, the use of benzene-based high-efficiency extractant instead of ether reduces the risk and pollution, and simplifies the operation steps. At the same time, the benzene-type high-efficiency extractant can be recycled, which is easy to operate, and the zinc powder decolorization process is added to ensure the stability of product quality. During the crude distillation process, the esterification reaction is completed at the same time, and a qualified crude ester semi-product is obtained at one time, which reduces the operation steps and improves the efficiency. Produced, increased production capacity and product yield, and reduced costs.

Description

Technical field: [0001] The invention relates to the technical field of chemical engineering, in particular to a method for producing isooctyl thioglycolate using thiourethane tail liquid. Background technique: [0002] At present, with the continuous expansion of the plastic stabilizer market, the demand for isooctyl ester as a raw material for the manufacture of stabilizers is also increasing. The existing processes are: 1. acidification of tail liquid; 2. removal of impurities with ether; 3. extraction of isooctyl alcohol; 4. esterification reaction; 5. removal of impurities of crude ester; Large, long reaction time, high cost, unstable product quality, and problems such as environmental pollution caused by unsafe ether treatment. Invention content: [0003] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and provide a method for utilizing thiourethane tail liquid to manufacture isooctyl thioglycolate, mainly solve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C323/52C07C319/12
Inventor 王雄斌姜维远徐晓黄东梅鲁新洲林乐平李海平
Owner YANTAI HUMON CHEM AUX CO LTD
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