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Method for refining non-petroleum-based ethylene glycol

A glycol-based, non-petroleum technology, applied in the field of refining non-petroleum-based glycol, can solve the unspecified separation of butanediol and other problems

Active Publication Date: 2020-03-13
CHANGCHUN MEIHE SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology only describes the improvement of the UV transmittance of ethylene glycol, and does not describe the ability to separate butanediol, such as compounds with the following molecular formula: , pentanediol, hexanediol and other alcohol impurities

Method used

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  • Method for refining non-petroleum-based ethylene glycol
  • Method for refining non-petroleum-based ethylene glycol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Attached figure 1 In the process shown in , the mixed alcohol feed is the material obtained after dehydration and light component removal of the mixed product produced with biomass as raw material. The composition of the material is 85.1% ethylene glycol, 1,2- Propylene glycol 6.6%, 1,2-butanediol 2.2%, 2,3-butanediol 0.4%, 1,4-butanediol 0.7%, 1,2-pentanediol 0.2%, 1,2-hexanediol 0.2%, 0.1%, glycerol 0.5%, sorbitol 0.5%, other light and heavy components 3.5%.

[0040] The mixed alcohol feed is mixed with the fresh entrainer iso-octanol into the 45th theoretical plate of the azeotrope column. The weight ratio of entrainer (including fresh entrainer and reused entrainer stream 2 and stream 11) to ethylene glycol in the mixed alcohol feed was 3.39:1. There are a total of 90 theoretical plates in the azeotropic column. The azeotropic agent stream 2 reused at the top of the tower and the azeotrope stream 11 reused at the bottom of the tower respectively enter the azeot...

Embodiment 2

[0045] Attached figure 1 In the process shown in , the mixed alcohol feed is the material obtained after dehydration and light component removal of the mixed product produced with biomass as raw material. The composition of the material in weight percentage is ethylene glycol 23.20%, 1,2- Propylene glycol 55.09%, 1,2-butanediol 4.60%, 2,3-butanediol 1.40%, 1,4-butanediol 0.60%, 1,2-pentanediol 0.31%, 1,2-hexanediol Alcohol 0.49%, 0.15%, glycerol 2.10%, sorbitol 1.90%, other light and heavy components 10.16%.

[0046] The mixed alcohol feed is mixed with the fresh entrainer 2-nonanone into the 30th theoretical plate of the azeotrope column. The weight ratio of entrainer (including fresh entrainer and reused entrainer stream 2 and stream 11) to ethylene glycol in mixed alcohol feed is 7.04:1. There are a total of 90 theoretical plates in the azeotropic column. The azeotropic agent stream 2 reused at the top of the tower and the azeotrope stream 11 reused at the bottom of th...

Embodiment 3

[0051] Attached figure 1 In the process shown in , the mixed alcohol feed is the material obtained after dehydration and removal of light components from the mixed product produced with biomass as raw material. The composition of the material in terms of weight percentage is ethylene glycol 92.50%, 1,2- Propylene glycol 4.89%, 1,2-butanediol 1.42%, 2,3-butanediol 0.17%, 1,4-butanediol 0.12%, 1,2-pentanediol 0.06%, 1,2-hexanediol Alcohol 0.24%, 0.07%, other light and heavy components 0.53%.

[0052] The mixed alcohol feed is mixed with the fresh entrainer n-decyl alcohol and enters the 30th theoretical plate of the azeotrope column. The weight ratio of entrainer (including fresh entrainer and reused entrainer stream 2 and stream 11) to ethylene glycol in mixed alcohol feed is 0.60:1. There are a total of 90 theoretical plates in the azeotropic column. The azeotropic agent stream 2 reused at the top of the tower and the azeotrope stream 11 reused at the bottom of the tower ...

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Abstract

The invention provides a method for refining non-petroleum-based ethylene glycol, wherein impurities with a boiling point close to the boiling point of ethylene glycol are separated. In the method, aC5-C20 oleophylic alcohol compound, C5-C20 alkane and / or C4-C20 oleophylic ketone compound are used as entrainers to be azeotropic with non-petroleum-based ethylene glycol to obtain an azeotrope containing ethylene glycol, then the entrainers in the azeotrope are separated and removed to obtain an ethylene glycol crude product, and the ethylene glycol crude product is further purified to obtain ethylene glycol.

Description

technical field [0001] The present invention relates to a method for refining ethylene glycol, in particular to The refining method of non-petroleum-based ethylene glycol such as impurities close to the boiling point of ethylene glycol and trace impurities such as acids, ethers, aldehydes, ketones and / or alcohols that affect the UV transmittance of ethylene glycol. Background technique [0002] In recent years, due to the uncertainty of oil prices and people's emphasis on sustainable development, non-petroleum routes such as coal-based ethylene glycol and biomass-based ethylene glycol production technologies have developed rapidly. However, due to the different synthetic routes, the non-petroleum route produces ethylene glycol by-products different from the ethylene glycol produced by the petroleum route, such as butanediol, pentanediol, hexanediol, Alcohol impurities such as alcohols, and impurities such as acids, ethers, aldehydes, ketones and / or alcohols that affect th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07D307/12C07C29/82
CPCC07D307/12C07C29/82C07C31/202C07C31/207C07C31/20C07C29/86C07C29/94
Inventor 袁一
Owner CHANGCHUN MEIHE SCI & TECH DEV