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Method and equipment for producing C4-C6 diacid low-carbon alcohol ester

A production method and technology of dibasic acid, applied in the chemical industry, can solve the problems of long time and high energy consumption, and achieve the effects of short reaction time, low catalyst dosage and low catalyst dosage

Inactive Publication Date: 2010-06-16
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: the present invention provides a kind of C 4 ~C 6 The production method and equipment of dibasic acid low-carbon alcohol ester have the characteristics of low energy consumption and continuous esterification production, and its purpose is to overcome the traditional production C 1 ~C 2 There are problems such as long time and high energy consumption in the esterification reaction of low-carbon alcohol esters

Method used

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  • Method and equipment for producing C4-C6 diacid low-carbon alcohol ester
  • Method and equipment for producing C4-C6 diacid low-carbon alcohol ester

Examples

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Effect test

example 1

[0032] The raw materials used are nylon acid and methanol, acid / alcohol=1:3 (mol / mol), and the amount of catalyst is 1% of the mass of nylon acid.

[0033] In the batching tank 1, add esterification catalyst p-toluenesulfonic acid, nylon acid, and methanol in sequence. After the addition is complete, turn on the stirring and raise the temperature to 60°C. After all the materials are dissolved, they are discharged into the material liquid storage tank 7 through the pipeline. The liquid material in the liquid storage tank 7 is sent to the continuous esterification reactor 4 through the feed metering pump 2. The continuous esterification reaction operation is controlled, the pressure is 1.0 MPa (gauge pressure), the reaction temperature is 130° C., and the esterification reaction residence time is 15 min. Under these conditions, the esterification is continued. When the continuous esterification reactor 4 reaches the above-mentioned operating conditions, slowly open the discharge po...

example 2

[0035] The raw materials used are nylon acid and ethanol, acid / alcohol=1:4 (mol / mol), and the amount of esterification catalyst is 1.5% of the mass of nylon acid.

[0036] The process of synthesizing diethyl nylonate from nylon acid and ethanol is the same as in Example 1. The differences are as follows: (1) The batching temperature is 75°C; (2) The operating pressure of the continuous esterification reaction is controlled to 1.2 MPa (gauge pressure), The reaction temperature is 130°C, and the residence time of the esterification reaction is 20min; (3) The flash evaporator system pressure is 0.07MPa and the temperature is 120°C. The experimental results are shown in Table 1.

example 3

[0038] The raw materials used are succinic acid and methanol, acid / alcohol=1:3 (mol / mol), and the amount of esterification catalyst is 1% of the mass of succinic acid.

[0039] The process of synthesizing dimethyl succinate from succinic acid and methanol is the same as that in Example 1, with the following differences: (1) The batching temperature is 65°C; (2) The operating pressure of the continuous esterification reaction is controlled to 0.9MPa (gauge pressure). ), the reaction temperature is 120°C, and the residence time of the esterification reaction is 10min; (3) The flasher system pressure is 0.09MPa and the temperature is 120°C. The experimental results are shown in Table 1.

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Abstract

The invention belongs to the chemical field, in particular to method and equipment for producing C1-C2 low-carbon alcohol ester of C4-C6 diacid. The method is characterized by comprising the following steps of: adding a catalytic agent, C4-C6 diacid and C1-C2 alcohol to a dispensing kettle, stirring and heating to enable the solid diacid to be dissolved; and then continuously delivering feed liquid to an esterification reactor to carry out esterification reaction under the conditions of a certain pressure, a certain reaction temperature and the like; continuously delivering an obtained esterification reaction mixture to a flash evaporator for flash evaporation; separating out unreacted alcohol and generated water from the upper part of the flash evaporator; discharging the product ester and unreacted raw material acid from the lower part of the flash evaporator; and then rectifying to obtain the C1-C2 alcohol ester of the C4-C6 diacid. The invention has the characteristics of low energy consumption and continuous esterification production, and aims to solve the problems existing in the aspects of long time, high energy consumption and the like in the esterification reaction for traditionally producing the C1-C2 low-carbon alcohol ester.

Description

1. Technical Field [0001] The present invention belongs to the field of chemical industry, and particularly relates to a production C 4 ~C 6 Dibasic acid C 1 ~C 2 Production method and equipment of lower alcohol ester. 2. Background technology [0002] C 4 ~C 6 Dibasic acid lower alcohol esters include: mixed dibasic acid (nylon acid) composed of succinic acid or glutaric acid or adipic acid or succinic acid, glutaric acid and adipic acid, which are esterified with methanol or ethanol respectively Synthesis of the corresponding dibasic acid lower alcohol ester by chemical reaction. Among them, the dimethyl dibasic acid produced by nylon acid is referred to as DBE, and this type of dimethyl dibasic acid is widely used as a solvent, cleaning agent, etc. This type of dimethyl dibasic acid (DBE) as a solvent has five major characteristics: first, colorless, light fragrance, low toxicity, low cost, and environmental protection; second, slow volatilization at room temperature and fast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/44C07C69/34C07C69/40C07C69/42C07C67/08
Inventor 唐丽华张晓娟徐铁军樊友贾长英邵英贵沈国良王文友陈旭沈显明
Owner SHENYANG POLYTECHNIC UNIV
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