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Method for distilling and purifying 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate

A technology of pentanediol monoisobutyrate and pentanediol diisobutyrate, which is applied in the field of distillation and purification of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, It can solve the problems that can only reach about 99.2%, high content of alcohol impurities, low purity of monoisobutyrate, etc., and achieve the effect of improving product performance, purity and product quality

Active Publication Date: 2021-03-02
TIANJIN RUIWEIJIN CHEM TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on the existing disclosed process, it can be known that at present, the 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate synthetic liquid obtained by the existing process is separated and purified by the existing distillation process, The highest final purity of the finished product can only reach about 99.2%, and the content of alcohol impurities in the finished product is relatively high. Therefore, there are 2,2,4-trimethyl-1,3-pentanediol monoiso The problem of lower purity of butyrate

Method used

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  • Method for distilling and purifying 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate
  • Method for distilling and purifying 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate
  • Method for distilling and purifying 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate

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Effect test

Embodiment 1

[0030] A method for distillation and purification of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, comprising: in 2,2,4-trimethyl-1,3-pentanediol 2,2,4-Trimethyl-1,3-pentanediol diisobutyrate or 2,2,4-trimethyl-1, 3-Pentanediol bisisobutyrate material. In this example, the 2,2,4-trimethyl-1,3-pentanediol diisobutyrate or 2,2,4-trimethyl-1,3-pentanediol diisobutyrate The introduction position of the ester material can be before entering the distillation system after the reaction, such as figure 1 Introduced in position 1. The introduction location can also be in the distillation system, such as figure 1In the introduction position 2 between the distillation tower and the isobutyraldehyde recovery tower, as another example figure 1 In the introduction position 3 between the isobutyraldehyde recovery tower and the alcohol recovery tower, as again figure 1 Introduction position 4 between the alcohol recovery tower and the refining tower.

[0031] The crude synthetic solut...

Embodiment 2

[0035] A method for distillation and purification of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, 2,2,4-trimethyl-1,3-pentanediol mono The crude synthesis liquid of isobutyrate is sent into the distillation column continuously at a speed of 100 kg / hour, wherein the content of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate is 65%, Diol content 8%, 2,2,4-trimethyl-1,3-pentanediol diisobutyrate content 0.3%. Into the distillation column, 2,2,4-trimethyl-1,3-pentanediol diisobutyrate is continuously introduced at a rate of 71.2 kg / hour, and the introduced 2,2,4-trimethyl- The mass ratio of 1,3-pentanediol diisobutyrate to 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate is 1.1:1, 2,2,4-tri The introduction position of methyl-1,3-pentanediol diisobutyrate is at the outlet of the synthetic liquid tank, the distillation tower separates and removes components such as light components and alcohol impurities, and the material effluent from the distillation tower tank is sent to 2 ...

Embodiment 3

[0037] A method for distillation and purification of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, 2,2,4-trimethyl-1,3-pentanediol mono The crude synthesis liquid of isobutyrate is sent into the distillation column continuously at a speed of 100 kg / hour, wherein the content of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate is 65%, Diol content 8%, 2,2,4-trimethyl-1,3-pentanediol diisobutyrate content 0.3%, continuously introduce 2,2, 4-Trimethyl-1,3-pentanediol diisobutyrate, introduced 2,2,4-trimethyl-1,3-pentanediol diisobutyrate with 2,2,4 - The mass ratio of trimethyl-1,3-pentanediol monoisobutyrate is 10:1, the introduction position of 2,2,4-trimethyl-1,3-pentanediol diisobutyrate At the outlet of the synthetic liquid tank, the distillation tower separates and removes components such as light components and alcohol impurities, and the material effluent from the bottom of the distillation tower is sent to 2,2,4-trimethyl-1,3-pentanediol monoiso The butyrate refining ...

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Abstract

The invention relates to a method for distilling and purifying 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, which comprises the step of controlling the ratio of 2, 2, 4-trimethyl-1, 3-pentanediol diisobutyrate to 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, such that the mass ratio is greater than or equal to 1, prior to distillation of a crude synthesis liquid of 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate. According to the method, 2, 2, 4-trimethyl-1, 3-pentanediol diisobutyrate is introduced in the distillation process or any step before distillation, and the mass ratioof 2, 2, 4-trimethyl-1, 3-pentanediol diisobutyrate to 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate is controlled, so that 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate can be prevented from reacting in the separation and purification process to generate alcohol, acid and other reactions, the content of alcohol impurities in the 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate obtained through distillation can be effectively reduced, the acid value of a final product can be effectively reduced, and the product quality is improved.

Description

technical field [0001] The invention relates to the field of separation and purification of chemical products, in particular to a method for distillation and purification of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate. Background technique [0002] 2,2,4-Trimethyl-1,3-pentanediol monoisobutyrate, also known as dodecyl alcohol ester, is a water-insoluble glycol ester with high boiling point and low freezing point. It is non-toxic, has very good compatibility with various solvents, and is generally recognized as a green solvent. 2,2,4-Trimethyl-1,3-pentanediol monoisobutyrate is a strong solvent for latex polymers with high hydrolytic stability and a wide range of applications, but its main function is for latex paints Film-forming, is a very ideal film-forming aid. [0003] The current main production process of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate is usually: under weak alkaline conditions, firstly, isobutyraldehyde itself undergoes aldol condensation reacti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/54C07C67/48C07C69/28
CPCC07C67/54C07C67/48C07C69/28Y02P20/10
Inventor 崔龙胡伟光
Owner TIANJIN RUIWEIJIN CHEM TECH LTD