Method for refining and separating dimethyl nylon acid

A technology of dimethyl mixed diacid and dimethyl succinate, which is applied to the preparation of carboxylic acid esters, chemical instruments and methods, and the preparation of organic compounds, and can solve complex production processes, high production costs, and large investment in equipment and other issues, to achieve the effects of simplified production process, environmentally friendly production process and high purity

Active Publication Date: 2014-02-26
WEIFANG YUANLI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To obtain the three esters requires three raw materials and three production processes, the production process is complicated, the equipment investment is large, and the production cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The raw material dimethyl mixed diacid is pumped into the first rectification tower with 100 trays connected in series at the head end, the vacuum degree in the tower is -0.07MPa, the gas phase temperature at the top of the tower is 90°C, and the temperature at the bottom of the tower is At 110°C, light components are separated from the top of the first rectification tower. After being condensed by the condenser, the liquid reflux ratio is 20:1. After the light components at the bottom of the tower cannot be detected, the bottom materials enter the towers connected in series The second rectification tower with 100 plates; the vacuum degree in the second rectification tower is -0.075MPa, the gas phase temperature at the top of the tower is 95°C, and the temperature at the bottom of the tower is 115°C. The top of the second rectification tower is separated, and after being condensed by the condenser, the liquid reflux ratio is 8:1, and the bottom material enters the third ...

Embodiment 2

[0022] The raw material dimethyl mixed diacid is pumped into the first rectification tower with 100 trays connected in series at the head end, the vacuum degree in the tower is -0.065MPa, the gas phase temperature at the top of the tower is 92°C, and the temperature at the bottom of the tower is At 113°C, the light components are separated from the top of the first rectification tower. After being condensed by the condenser, the liquid reflux ratio is 19:1. After the light components at the bottom of the tower cannot be detected, the bottom materials enter the towers connected in series The second rectification tower with 100 plates; the vacuum degree in the second rectification tower is -0.07MPa, the gas phase temperature at the top of the tower is 98°C, and the temperature at the bottom of the tower is 117°C. The top of the second rectification tower is separated, and after being condensed by the condenser, the liquid reflux ratio is 7:1, and the bottom material enters the th...

Embodiment 3

[0024] The raw material dimethyl mixed diacid is pumped into the first rectification tower with 100 trays connected in series at the head end, the vacuum degree in the tower is -0.06MPa, the gas phase temperature at the top of the tower is 95°C, and the temperature at the bottom of the tower is At 115°C, the light component is separated from the top of the first rectification tower. After being condensed by the condenser, the liquid reflux ratio is 18:1. After the light component at the bottom of the tower cannot be detected, the bottom material enters the columns connected in series The second rectification tower with 100 plates; the vacuum in the second rectification tower is -0.065MPa, the gas phase temperature at the top of the tower is 100°C, and the temperature at the bottom of the tower is 122°C. The top of the second rectification tower is separated, and after being condensed by the condenser, the liquid reflux ratio is 6.5:1, and the bottom material enters the third re...

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PUM

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Abstract

The invention discloses a method for refining and separating dimethyl nylon acid. The refining and separating processes are completed in four rectifying towers connected in series. Raw material dimethyl nylon acid sequentially enters the four rectifying towers connected in series, light components, 1, 4-succinic acid dimethyl ester, 1, 5-glutaric acid dimethyl ester and 1,6-dimethyl ester are respectively separated out from tower tops of the first rectifying tower, the second rectifying tower, the third rectifying tower and the fourth rectifying tower, and the vacuum degrees of the four rectifying towers connected in series are respectively -0.06 to -0.075MPa, -0.065 to -0.08MPa, -0.070 to -0.085MPa and -0.075 to -0.09MPa. The gaseous phase temperatures at the tower tops of the four rectifying towers are respectively 90-100 DEG C, 95-105 DEG C, 100-110 DEG C and 105-115 DEG C, and the relative vacuum degrees and temperatures of the rectifying towers sequentially rise from the first rectifying tower.

Description

technical field [0001] The present invention relates to the preparation technology of lipids, in particular to a method for preparing 1,4-dimethyl succinate, 1,5-dimethyl glutarate and 1,6- The production method of dimethyl adipate. Background technique [0002] Dimethyl 1,4-succinate, dimethyl 1,5-pentanedioate, and dimethyl 1,6-hexanedioate are all important chemical raw materials, among which, dimethyl 1,4-succinate Esters are mainly used in food spices, in the preparation of fruit and fruit wine flavors and in the pharmaceutical industry, and also in the synthesis of light stabilizers, high-grade paints, fungicides, pharmaceutical intermediates, etc.; 1,5-dimethyl glutarate Mainly used in organic synthesis; dimethyl 1,6-adipate can be used as a raw material for the synthesis of intermediates, medicines, and spices, as a plasticizer and high-boiling solvent, and as the main component of dimethyl nylon acid. As a raw material for hydrogenation to produce 1,6-hexanediol, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/40C07C69/42C07C69/44C07C67/54
Inventor 刘修华杨辉谭立文秦国栋张建梅
Owner WEIFANG YUANLI CHEM
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