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A process for producing ethylene glycol from syngas

A synthesis gas and ethylene glycol technology, applied in the preparation of organic compounds, chemical industry, climate sustainability, etc., can solve the problems of low purity of ethylene glycol products and high production costs, and achieve less auxiliary units and low production costs , The effect of low refining cost

Active Publication Date: 2021-08-13
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides a process for producing ethylene glycol from synthesis gas, specifically the process of producing ethylene glycol from synthesis gas through "methanol-formaldehyde-glycolic acid-glycolic acid ester", so as to solve the current ethylene glycol synthesis process Existing problems of high production cost and low purity of ethylene glycol products

Method used

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  • A process for producing ethylene glycol from syngas

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Effect test

Embodiment 1

[0031] 200,000 tons / year ethylene glycol synthesis (300 days of annual operation)

[0032] H 2 / CO molar ratio is 2 / 1, yield is 1.6 million Nm 3 / day syngas is divided into two parts, one part is 800,000 Nm 3 / day for methanol synthesis. Another part of 800,000 Nm 3 / day for CO and H 2 Separation, respectively used as raw materials for carbonylation of formaldehyde and hydrogenation of methyl glycolate. Using the method disclosed in the patent CN102133498A to cryogenically separate CO and H 2 , the yield of CO after separation is 267,000 Nm 3 / day, H 2 The output is 534,000 Nm 3 / sky.

[0033] The methanol synthesis adopts the Linde spiral coil isothermal tower methanol synthesis process, and the raw gas volume is 800,000 Nm 3 The synthesis gas per day, after heat exchange, enters the tower gas at a temperature of 225°C, and directly enters the reaction tube of the synthesis tower from the upper part, and generates methanol under the action of the catalyst. The meth...

Embodiment 2

[0039] 300,000 tons / year ethylene glycol synthesis (300 days of annual operation)

[0040] H 2 / CO molar ratio is 2 / 1, yield is 2.4 million Nm 3 / day syngas is divided into two parts, one part is 1.2 million Nm 3 / day for methanol synthesis. Another part of 1.2 million Nm 3 / day for CO and H 2 Separation, respectively used as raw materials for carbonylation of formaldehyde and hydrogenation of methyl glycolate. Using the method disclosed in the patent CN102191086A to cryogenically separate CO and H 2 , the yield of CO after separation is 400,000 Nm 3 / day, H 2 The output is 800,000 Nm 3 / sky.

[0041] Methanol synthesis adopts lurgi tubular isothermal synthesis tower low-pressure synthesis process. Syngas raw material 1.2 million Nm 3 / day The temperature of the gas entering the tower after heat exchange is 225°C, and it directly enters the reaction tube of the synthesis tower from the upper part to generate methanol under the action of the catalyst. Methanol synth...

Embodiment 3

[0047] 500,000 tons / year ethylene glycol synthesis (300 days of annual operation)

[0048] H 2 / CO molar ratio is 2 / 1, yield is 4 million Nm 3 / day syngas is divided into two parts, one part is 2 million Nm 3 / day for methanol synthesis. Another part of 2 million Nm 3 / day for CO and H 2 Separation, respectively used as raw materials for carbonylation of formaldehyde and hydrogenation of methyl glycolate. Using the method disclosed in the patent CN102191086A to cryogenically separate CO and H 2 , the yield of CO after separation is 667,000 Nm 3 / day, H 2 The output is 1.333 million Nm 3 / sky.

[0049] Methanol synthesis adopts ICI multi-stage quenching tower multi-stage synthesis process, the reaction tower is divided into 4 beds, and the catalyst uses ICI51-1 catalyst of ICI company. The raw material synthesis gas volume is 2 million Nm 3 / day of synthesis gas, the mixed temperature of the gas entering the tower after heat exchange and part of the chilled gas is 22...

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Abstract

The invention relates to a process for producing ethylene glycol from synthesis gas, a process for producing ethylene glycol from synthesis gas. Synthesis gas and methanol synthesis tail gas are mixed into methanol synthesis raw materials, and methanol and methanol synthesis are produced under the action of a methanol synthesis catalyst Exhaust gas: a part of methanol is mixed with air to generate formaldehyde and formaldehyde synthesis tail gas under the action of formaldehyde synthesis catalyst, and another part of methanol is mixed with methanol recycled from hydrogenation reaction and then esterified with glycolic acid to form methyl glycolate; synthesis gas separation H obtained 2 After mixing with methyl glycolate hydrogenation tail gas, it will generate ethylene glycol, methanol and hydrogenation tail gas with methyl glycolate under the action of hydrogenation catalyst; separate ethylene glycol and methanol.

Description

technical field [0001] The invention relates to a process for producing ethylene glycol from synthesis gas, specifically the process of synthesizing ethylene glycol from synthesis gas through "methanol-formaldehyde-glycolic acid-glycolic acid ester". [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 to make 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/149C07C31/20
CPCC07C29/149C07C29/1512C07C45/29C07C51/12C07C67/08C07C31/202C07C31/04C07C47/04C07C59/06C07C69/675Y02P20/10
Inventor 李德宝郭荷芹陈从标李莉贾丽涛侯博夏铭
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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