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Method for producing ethylene glycol from formaldehyde

A technology of ethylene glycol and formaldehyde, which is applied in the production of bulk chemicals, chemical instruments and methods, and the preparation of organic compounds, and can solve problems such as low yields of glycolic acid and ethylene glycol, harsh reaction conditions, and long process flow , to achieve the effect of increasing yield, reducing pressure and shortening the process flow

Inactive Publication Date: 2020-04-21
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] The technical problem to be solved by the present invention is: how to solve the problems that the current formaldehyde-based ethylene glycol route has a long technical process, harsh reaction conditions, and low yields of glycolic acid and ethylene glycol

Method used

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  • Method for producing ethylene glycol from formaldehyde
  • Method for producing ethylene glycol from formaldehyde
  • Method for producing ethylene glycol from formaldehyde

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 37.0wt% formaldehyde, reaction solvent sulfolane and CO produced from methanol cracking enter the carbonylation esterification reactor filled with HZSM-5 (Si / Al molar ratio is 30) molecular sieves for carbonylation reaction. The mixed raw material is composed of: the mass content of sulfolane in the liquid phase raw material is 75.0wt%, the mass content of formaldehyde in the liquid phase raw material is 9.3wt%, H 2 The O / formaldehyde molar ratio was 2.7. The carbonylation reaction temperature is 160°C and the pressure is 8.0MPa. The performance of the carbonylation reaction is shown in Table 1.

[0052] Methanol enters the reactor from the middle of the carbonylation esterification reactor to carry out the esterification reaction. The esterification reaction conditions are as follows: the molar ratio of methanol and glycolic acid is 3.0, the reaction temperature is 120° C., and the reaction pressure is 6.0 MPa. The performance of the esterification reaction is shown...

Embodiment 2

[0056] The technological process of embodiment 2 and embodiment 3 is consistent with embodiment 1, and some parameters of modification are shown in table 1.

Embodiment 4

[0058] Paraformaldehyde, water, trifluoromethanesulfonic acid, sulfolane and CO from methanol cracking enter the carbonylation esterification reactor. The mixed raw material is composed of: the mass content of sulfolane in the liquid phase raw material is 75.0wt%, the mass content of paraformaldehyde in the liquid phase raw material is 10.0wt%, H 2 The molar ratio of O and formaldehyde is 1.0, and the mass content of trifluoromethanesulfonic acid in the liquid phase raw material is 2.0 wt%. The carbonylation reaction temperature is 120°C and the pressure is 8.0MPa. The carbonylation reaction performance is shown in Table 2.

[0059] Methanol enters the reactor from the middle of the carbonylation esterification reactor to carry out the esterification reaction. The esterification reaction conditions are as follows: the methanol / glycolic acid molar ratio is 2.0, the reaction temperature is 120° C., and the reaction pressure is 8.0 MPa. The esterification reaction performance ...

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Abstract

The invention relates to a method for producing ethylene glycol from formaldehyde. The method comprises the following steps: carrying out a carbonylation reaction process on formaldehyde, CO and a solvent under the action of an acidic catalyst to generate a glycollic acid-based product, then, carrying out an esterification reaction process on the glycolic acid-based product and an esterification agent alcohol to generate glycolate, and finally, hydrogenating glycolate to generate ethylene glycol. The method has the beneficial effects that the technological process is short, the investment costis low, the pressure of a formaldehyde carbonylation reaction is reduced, the yield of glycollic acid is increased, and then the yield of ethylene glycol in the whole technological process is increased.

Description

technical field [0001] The invention relates to a method for producing ethylene glycol from formaldehyde, specifically a method for producing ethylene glycol from formaldehyde through carbonylation-esterification-hydrogenation. [0002] technical background [0003] Ethylene Glycol (EG for short) is an important chemical raw material, mainly used for synthetic resin (PET), fiber-grade PET is polyester fiber, bottle-grade PET is used for making mineral water bottles, etc. About 89% of the downstream products of ethylene glycol are used in the polyester industry. my country is the world's largest consumer of ethylene glycol, accounting for about 52% of the world's total consumption. From 2009 to 2018, the average annual growth rate of my country's ethylene glycol consumption was 13.09%, but my country's EG production capacity was seriously insufficient, and its dependence on foreign countries reached more than 60%. [0004] At present, the main production processes of ethylen...

Claims

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Application Information

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IPC IPC(8): C07C29/149C07C31/20
CPCC07C29/149C07C51/12C07C67/08C07C31/202C07C59/06C07C69/675Y02P20/52
Inventor 李德宝郭荷芹陈从标侯博贾丽涛李莉夏铭
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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