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Method for Improving the Product Quality of Ethylene Glycol Produced from Syngas

A product quality, ethylene glycol technology, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve problems such as reducing product purity, industrialization restrictions, and inability to process routes.

Active Publication Date: 2020-01-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Some of the previous methods are still in the experimental research stage, and some industrialization is limited. Although the method for improving the quality of the petroleum route ethylene glycol product is relatively mature, due to its impurity composition and the ethylene glycol produced by the synthesis gas ethylene glycol method The impurities in the product are not the same, so it cannot be well used in the process route of syngas to ethylene glycol, or directly hydrogenating the ethylene glycol product whose purity meets the national standard but whose UV value does not meet the standard may reduce the product to a certain extent the purity of

Method used

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  • Method for Improving the Product Quality of Ethylene Glycol Produced from Syngas
  • Method for Improving the Product Quality of Ethylene Glycol Produced from Syngas
  • Method for Improving the Product Quality of Ethylene Glycol Produced from Syngas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Stream 1 contains 97% ethylene glycol, 350ppm of C=O impurities, and enters the rectifying tower 2 with an overhead pressure of 0.1kpa. The rising gas at the top of the column of 2 contains 99.2% of ethylene glycol and 188ppm of C=O impurities. The ascending gas is completely condensed by the condenser 4 and then divided into two parts, a stream 5 and a stream 7, and the mass ratio of the two streams is 0.01. The cooling medium of the condenser 4 is cooling water at 10°C. Stream 5 is extracted as first-class product of ethylene glycol. Stream 7 is cooled to 80 DEG C through cooler 6, and after entering refiner 8 for refining, C=O impurity stream 10 containing ethylene glycol 99.7% and 15 ppm enters heater 9 and is heated to bubble point temperature and returns to tower 2 as reflux. The polyester grade ethylene glycol extracted from the side line of the second tower contains 99.94% ethylene glycol and 6ppm of C=O impurity.

[0051] Table 1 shows the UV values ​​of the ...

Embodiment 2

[0055] Stream 1 contains 85% ethylene glycol, 500ppm of C=O impurities, and enters the rectifying tower 2 with an overhead pressure of 30kpa. The rising gas at the top of tower 2 contains 99.99% of ethylene glycol and 327ppm of C=O impurities. The ascending gas is completely condensed by the condenser 4 and then divided into two parts, a stream 5 and a stream 7, and the mass ratio of the two streams is 0.5. The cooling medium of the condenser 4 is saturated water at 130°C. The cooling medium outlet of the condenser 4 is saturated steam at 130°C. Stream 5 is extracted as first-class product of ethylene glycol. Stream 7 is cooled to 130 DEG C through cooler 6, enters refiner 8 after refining, stream 10 containing the C=O impurity of ethylene glycol 99.3% and 8ppm enters heater 9 and is heated to bubble point temperature and returns 2 towers as reflux. The polyester-grade ethylene glycol extracted from the 2-tower measuring line contains 99.8% ethylene glycol and 8ppm of C=O im...

Embodiment 3

[0060] Stream 1 contains 99% ethylene glycol and 130ppm of C=O impurities, and enters the rectifying tower 2 with an overhead pressure of 3kpa. The rising gas at the top of the tower contains 99.93% of ethylene glycol and 35ppm of C=O impurities. The ascending gas is completely condensed by the condenser 4 and then divided into two parts, a stream 5 and a stream 7, and the mass ratio of the two streams is 0.06. The cooling medium of the condenser 4 is saturated water at 120°C. The cooling medium outlet of the condenser 4 is saturated steam at 120°C. Stream 5 is extracted as first-class product of ethylene glycol. Stream 7 is cooled to 90 DEG C through cooler 6, and after entering refiner 8 for refining, stream 10 containing ethylene glycol 99.94% and 2ppm C=O impurities enters heater 9 and is heated to the bubble point temperature and returns to tower 2 as reflux. The polyester-grade ethylene glycol extracted from the 2-tower measuring line contains 99.95% ethylene glycol an...

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Abstract

The invention relates to a method for improving the quality of a glycol product made from synthetic gas to mainly solve the problem that a glycol product made from synthetic gas is low in ultraviolet transmittance (UV value) and high in impurity (particularly C=O) content. The method adopts the technical scheme that gas rise to the top of a refinery column of the glycol product is condensed into two flows including a material flow 5 and a material flow 7, wherein the material flow 5 is taken as top-quality glycol for extraction and the material flow 7 is sent back to a refiner to remove the impurities, and then the obtained product taken as a return flow returns to the refinery column of the glycol product, the problem is well solved. The method is used for industrial production of glycol product made from synthetic gas.

Description

[0001] field of invention [0002] The invention relates to a method for improving the product quality of ethylene glycol produced from synthesis gas. Background technique [0003] Ethylene glycol is an important chemical raw material and strategic material for the manufacture of polyester (which can be further produced for polyester, beverage bottles, films), explosives, glyoxal, and can be used as antifreeze, plasticizer, hydraulic fluid and solvent, etc. . In 2012, the global consumption of ethylene glycol was about 22 million tons, of which 84.7% was used to produce PET resin, 8.1% was used as antifreeze, and 98.5% of ethylene glycol was produced through ethylene oxide hydration process. China's ethylene glycol self-sufficiency rate has been less than 30% for a long time, and the import volume has increased year by year; in 2013, China's ethylene glycol production was 3.74 million tons, consumption was 11.71 million tons, and import volume reached 8.24 million tons. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/20C07C29/80C07C29/74
CPCC07C29/74C07C29/80C07C31/202
Inventor 杨卫胜郭毅
Owner CHINA PETROLEUM & CHEM CORP