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A kind of preparation method of trans-1,2-cyclohexanediol diacetate

A technology of cyclohexanediol diacetate and cyclohexanediol is applied in the field of preparation of trans-1,2-cyclohexanediol diacetate, which can solve the problem of restricting large-scale industrial production of MCA and high production cost of MCA , long production process route and other problems, to achieve the effect of excellent organic solubility, low synthesis cost and high product yield

Active Publication Date: 2016-08-31
北京凯迪森科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of o-cresol, an organic phenol with strong toxicity and corrosiveness, is involved in the production process of MCA, which has caused great pressure on the environmental protection of production enterprises.
In addition, the MCA production process also involves the application of dangerous chemical processes (hydrogenation reaction under high temperature and high pressure), and the entire production process route is long, which makes the production cost of MCA relatively high, and the product sales price is at a relatively high position
[0003] The above-mentioned various problems in the production process of MCA limit the large-scale industrial production of MCA, and also limit its wide application in the production process of hydrogen peroxide by anthraquinone method

Method used

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  • A kind of preparation method of trans-1,2-cyclohexanediol diacetate
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  • A kind of preparation method of trans-1,2-cyclohexanediol diacetate

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Embodiment 1

[0036] A preparation method of trans-1,2-cyclohexanediol diacetate of the present invention comprises the following steps:

[0037] (1) if figure 1 Shown, in the 1000ml four-necked flask 1 that has mechanical stirrer 2 and reflux separator 3 (the opening that has thermometer is in figure 1 116 g (1 mol) of a sample of trans-1,2-cyclohexanediol and 8.0 g of esterification catalyst p-toluenesulfonic acid were added, and then 200 g of reaction solvent methylcyclohexane was added. The four-necked flask 1 was placed in an electric heating mantle 5 to heat up to completely dissolve the trans-1,2-cyclohexanediol and the esterification catalyst.

[0038] In this example, trans-1,2-cyclohexanediol is obtained by hydrolysis reaction of epoxycyclohexane recovered from the by-product light oil in the production process of cyclohexanone under acidic conditions; the hydrolysis reaction The post-treatment of liquid includes stratification, neutralization, concentration, crystallization and...

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Abstract

The invention discloses a preparation method of trans-1,2-cyclohexanol glycol diacetate. The preparation method comprises the following steps: (1) adding trans-1,2-cyclohexanol glycol and an esterification catalyst into a reaction container, then adding a reaction solvent, and heating to ensure that the trans-1,2-cyclohexanol glycol and the esterification catalyst are completely dissolved; (2) heating the reaction solution while stirring to boil the reaction solution, and when an organic phase overflow layered in a refluxing water separator returns to the reaction container, dropwise adding an esterifying agent into the reaction solution, and continuously reacting after dropwise adding the esterifying agent until the esterification reaction is finished; and (3) performing filtration, alkali cleaning, water washing and rectification on a reaction product to obtain the trans-1,2-cyclohexanol glycol diacetate. The preparation method disclosed by the invention is high in yield, low in investment and running costs and simple in production process, and is easy to realize industrial large-scale production.

Description

technical field [0001] The invention relates to a method for preparing a solvent in an anthraquinone-based hydrogen peroxide production process, in particular to a method for preparing trans-1,2-cyclohexanediol diacetate. Background technique [0002] The traditional 2-methylcyclohexyl acetate (hereinafter referred to as "MCA") is a kind of hydrogen peroxide industry confirmed at home and abroad, which has good solubility for the working carrier (alkylanthraquinone and alkylhydroanthraquinone) in the production process of hydrogen peroxide. excellent solvent. However, the use of o-cresol, an organic phenol with strong toxicity and corrosiveness, is involved in the production process of MCA, which puts great pressure on the environmental protection of production enterprises. In addition, the MCA production process also involves the application of dangerous chemical processes (hydrogenation reaction under high temperature and pressure), and the entire production process route...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/16C07C67/08
CPCC07C67/08C07C67/48C07C67/54C07C2601/14C07C69/16
Inventor 杨华卿光宗于星
Owner 北京凯迪森科技有限公司
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