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Method for preparing ethylene glycol through gas phase hydrogenation of oxalate

A technology of ethylene glycol and oxalate, applied in chemical instruments and methods, chemical/physical processes, preparation of hydroxyl compounds, etc., can solve the problems of low selectivity of ethylene glycol

Active Publication Date: 2015-04-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is the low technical problem of ethylene glycol selectivity in the process of hydrogenation of oxalate ester used in the previous document technology to prepare ethylene glycol, and a new oxalate ester is provided through gas-phase hydrogenation Method for producing ethylene glycol

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  • Method for preparing ethylene glycol through gas phase hydrogenation of oxalate

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Embodiment 1

[0021] use figure 1 In a fluidized bed reactor, the vertical distance between the terminator injection port and the bottom of the riser is 1 / 5 of the length of the riser, the inner diameter of the riser is 1 / 10 of the outer diameter of the dense phase zone, and the height of the riser is 1 / 4 of the height of the phase area. The vertical distance between the regeneration inclined pipe of the fluidized bed reactor and the connection port of the dense phase area is 1 / 5 of the vertical height of the dense phase area from the bottom of the dense phase area, and the vertical height of the transition area of ​​the fluidized bed reactor is 1 / 5 of the vertical height of the dense phase area / 10. The average particle diameter is 80 microns, and the composition is 30wt%Cu+10wt%Zn+1wt%W / SiO 2 The fluidized bed catalyst, methanol is the terminator, with dimethyl oxalate as raw material, the weight ratio of raw material and terminator is 10: 1, the feed temperature of terminator is 40 ℃, ...

Embodiment 2

[0023] use figure 1 In a fluidized bed reactor, the vertical distance between the terminator injection port and the bottom of the riser is 1 / 8 of the length of the riser, the inner diameter of the riser is 1 / 12 of the outer diameter of the dense phase zone, and the height of the riser is 1 / 2 of the height of the phase area. The vertical distance between the regeneration inclined pipe of the fluidized bed reactor and the connection port of the dense phase area is 1 / 3 of the vertical height of the dense phase area from the bottom of the dense phase area, and the vertical height of the transition area of ​​the fluidized bed reactor is 1 / 3 of the vertical height of the dense phase area / 5. The composition is 40wt%Cu+5wt%Zn+1wt%Ni / SiO 2 The fluidized bed catalyst, its particle diameter average is 100 microns, and ethanol is terminator, is raw material with diethyl oxalate, and the weight ratio of raw material and terminator is 10: 1, and terminator feeding temperature is 40 ℃, in...

Embodiment 3

[0025] use figure 1 The fluidized bed reactor adopts a composition of 28wt%Cu+3wt%Al / SiO 2 The average diameter of catalyst particles is 120 microns, water is the terminator, the vertical distance between the terminator injection port and the bottom of the riser is 1 / 10 of the length of the riser, and the inner diameter of the riser is 1 / 10 of the outer diameter of the dense phase zone 1 / 6, the height of the riser is 1 / 8 of the height of the dense phase zone. The vertical distance between the connecting port of the regenerated inclined pipe and the dense-phase area and the bottom of the dense-phase area is 1 / 6 of the vertical height of the dense-phase area. The vertical height of the transition zone is 1 / 7 of the vertical height of the dense phase zone. The vertical distance between the gas inlet of the cyclone separator and the top of the gas collection chamber is 1 / 4 of the diameter of the settler. Dimethyl oxalate is used as raw material, the weight ratio of raw material...

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Abstract

The invention relates to a method for preparing ethylene glycol through gas phase hydrogenation of oxalate, and mainly solves the technical problem in the prior art that in the reaction process of hydrogenation of oxalate to ethylene glycol, the selectivity of ethylene glycol is low. The method adopts oxalate as the raw material and methanol, alcohol or water as a terminator, and comprises the step that the raw material is in contact with a copper bearing catalyst in a fluidized bed reactor of an external cyclone separator to generate an effluent containing ethylene glycol under the conditions that the reaction temperature is 170-270 DEG C, the weight space velocity of oxalate is 0.2-5hours <-1>, the hydrogen / ester molar ratio is 40-200:1 and the reaction pressure is 1.5-10MPa. By adopting the technical scheme, the problem is better solved, and the method provided by the invention can be used for industrial increase production of ethylene glycol.

Description

technical field [0001] The invention relates to a method for preparing ethylene glycol by gas-phase hydrogenation of oxalate, in particular about the use of an external cyclone separator, which is practical for the reaction process of oxalate hydrogenation for preparing ethylene glycol. Background technique [0002] Ethylene glycol (EG) is an important organic chemical raw material, mainly used in the production of polyester fiber, antifreeze, unsaturated polyester resin, lubricant, plasticizer, nonionic surfactant and explosives, etc. It can be used in industries such as paint, photographic developer, brake fluid and ink, as a solvent and medium for ammonium perborate, and for the production of special solvents such as glycol ether, etc., and has a wide range of uses. [0003] At present, my country has surpassed the United States to become the world's largest consumer of ethylene glycol. From 2001 to 2006, the average annual growth rate of domestic apparent consumption rea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/20C07C29/149B01J8/22
Inventor 刘俊涛李蕾张惠明
Owner CHINA PETROLEUM & CHEM CORP