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A kind of 2-ethylhexyl acrylate waste oil recovery process

A technology of ethylhexyl ester and acrylic acid, which is applied in the direction of carboxylate preparation, carboxylate separation/purification, carboxylate preparation, etc. It can solve the problem of high concentration of polymerization inhibitor, affecting the effect of polymerization inhibition, and the effect of polymerization inhibition is not good. Ideal and other issues to achieve the effect of ensuring the effect of polymerization inhibition

Active Publication Date: 2017-06-13
JIANGSU XINDONGFENG CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different types of polymerization inhibitors have different action mechanisms. In the prior art, there is a technical solution for using a single polymerization inhibitor, but the polymerization inhibition effect is not ideal.
In addition, too much amount of polymerization inhibitor will affect the effect of polymerization inhibition
In the prior art, liquid caustic soda is used to neutralize excess acrylic acid after the esterification reaction, and then the oil layer produced by neutralization is directly rotated to lighten the process. However, the commonly used polymerization inhibitor has a high boiling point and is soluble in the target product. As a result, the concentration of the polymerization inhibitor in the light removal process is too large, and the polymerization inhibition effect is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The raw material of embodiment 1 acrylate-2-ethylhexyl waste oil recovery process is acrylate-2-ethylhexyl waste oil and acrylic acid waste oil, and the acrylate-2-ethylhexyl waste oil component is 4.72% acrylic acid , 51.6% of 2-ethylhexyl acrylate, 9.44% of isooctyl, 1.6% of water, 32.64% of 2-hexyl octyloxyacrylate, the composition of acrylic waste oil is 38.52% of acrylic acid dimer, 5.8% water, 55.68% acrylic acid, the ratio of the amount of 2-ethylhexyl acrylate waste oil to acrylic acid waste oil is 6:1, and excessive isooctyl alcohol is put in for depolymerization reaction.

[0026] S1: Depolymerization, heat up and depolymerize the mixture of 2-ethylhexyl acrylate waste oil, acrylic acid waste oil, esterification acid catalyst (p-toluenesulfonic acid) and isooctyl alcohol, and depolymerize the obtained reaction liquid after the reaction Carry out distillation, the main component is the mixed steam of 2-ethylhexyl acrylate, isooctyl alcohol and water, after cond...

Embodiment 2

[0045] The difference between Example 2 and Example 1 is that the process conditions of back steaming are 135°C and negative pressure -0.1MPa.

[0046] The process conditions for depolymerization are 135°C, negative pressure -0.095MPa; the process conditions for depolymerization material esterification are 125°C, negative pressure -0.095MPa; the process conditions for light removal are 115~120°C, negative pressure -0.1MPa; The process conditions for deweighting are 125°C and negative pressure -0.1MPa.

Embodiment 3

[0048] The difference between Example 3 and Example 1 is that the process conditions of back steaming are 145°C and negative pressure -0.095MPa.

[0049] The process conditions for depolymerization are 145°C, negative pressure -0.085MPa; the process conditions for depolymerization material esterification are 135°C, negative pressure -0.085MPa; the process conditions for light removal are 120~125°C, negative pressure -0.095MPa ; Deweighting process conditions are 130 ° C, negative pressure -0. 095MPa.

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PUM

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Abstract

The invention discloses a 2-ethylhexyl acrylate waste oil recovery technology including six steps of depolymerization, depolymerized material esterification, back distillation, neutralization, low boiling fraction removal and high boiling fraction removal. By addition of the back distillation step between the esterification and neutralization steps, 2-ethylhexyl acrylate and a polymerization inhibitor added in the depolymerization and esterification steps are separated, other high boiling point impurities can also be isolated at the same time, and the addition amount and proportion selected control of the polymerization inhibitor in the low boiling fraction removal step can be facilitated.

Description

technical field [0001] The invention relates to the field of recovery of acrylate waste oil, in particular to a process for recovery of 2-ethylhexyl acrylate waste oil. Background technique [0002] 2-Ethylhexyl acrylate is an important synthetic intermediate and a monomer for the synthesis of polymers, widely used in rubber, medicine, leather, paper, adhesives and coatings industries. At present, the amount of waste oil produced in the production process of acrylic acid and acrylic acid esters is increasing, which requires corresponding treatment. The main components in 2-ethylhexyl acrylate waste oil are 2-ethylhexyl acrylate, acrylic acid, isooctyl alcohol, water and 2-ethylhexyl methoxyacrylate. The recovery of 2-ethylhexyl acrylate in the prior art mainly includes four processes of cracking, esterification, light removal and heavy removal. Chinese patent 200820214814.5 discloses a recovery device for acrylic acid, that is, acrylic waste oil, in which the cracking, est...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/54C07C67/08C07C67/48C07C67/54
CPCC07C51/377C07C67/08C07C67/48C07C67/54C07C67/60C07C57/04C07C69/54
Inventor 周晓云
Owner JIANGSU XINDONGFENG CHEM TECH
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