Method for producing ethanediol from oxalic ester and hydrogen

An oxalate and ethylene glycol technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of uneven air distribution, uneven distribution, and backflow, etc., and improve catalyst utilization. , avoid overload and load, eliminate the effect of short circuit and channel current

Active Publication Date: 2013-07-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is that in the past oxalate ester hydrogenation technology to produce ethylene glycol, the reactant flows through the gas pre-distributor at the inlet of the fixed bed reactor, and the distribution is uneven, and there is backflow, which leads to the catalyst bed of the reactor The gas flow distribution in the layer is not uniform, the catalyst cannot be used uniformly and fully, the conversion rate of oxalate is low and the selectivity of the target product ethylene glycol is low, and a new method for the hydrogenation of oxalate to produce ethylene glycol is provided.

Method used

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  • Method for producing ethanediol from oxalic ester and hydrogen
  • Method for producing ethanediol from oxalic ester and hydrogen
  • Method for producing ethanediol from oxalic ester and hydrogen

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The inner diameter of the axial flow fixed bed gas-solid catalytic reactor is 2 meters, and the inner diameter of the feed port is D in for 350 mm, using as Figure 4 The two-stage porous baffle type inlet gas predistributor shown above, the upper and lower porous baffles are spherical porous baffles, the distributor cylinder and the porous upper baffle are connected by 4 evenly distributed tie bars, the porous upper baffle The plate and the perforated lower baffle are connected by 4 evenly distributed tie bars. The inner diameter D of the distributor cylinder is 300 mm, the diameter d of the large hole of the porous upper baffle is 150 mm, and the diameter of the circular small hole 5 mm, the opening rate is 30%, the diameter of the circular small hole of the porous lower baffle is 5 mm, the opening rate is 25%, the lateral annular gap height H1 between the distributor cylinder and the porous upper baffle is 130 mm, and the lateral annular gap height H2 between the...

Embodiment 2

[0030] The inner diameter of the axial flow fixed bed gas-solid catalytic reactor is 4 meters, and the inner diameter of the feed port is D in for 700mm, using as Figure 4The two-stage porous baffle type inlet gas predistributor shown above, the upper and lower porous baffles are spherical porous baffles, the distributor cylinder and the porous upper baffle are connected by 8 evenly distributed tie bars, the porous upper baffle The board and the perforated lower baffle are connected by 8 evenly distributed tie bars. The inner diameter D of the distributor cylinder is 660 mm, the diameter d of the large hole of the porous upper baffle is 500 mm, and the diameter of the circular small hole 8 mm, the opening rate is 60%, the circular hole diameter of the porous lower baffle is 8 mm, the opening rate is 50%, the lateral annular gap height H1 between the distributor cylinder and the porous upper baffle is 240 mm, and the lateral annular gap height H2 between the porous upper a...

Embodiment 3

[0032] The inner diameter of the axial flow fixed bed gas-solid catalytic reactor is 3.4 meters, and the inner diameter of the feed port is D in for 600mm, using as Figure 4 The two-stage porous baffle type inlet gas predistributor shown above, the upper and lower porous baffles are spherical porous baffles, the distributor cylinder and the porous upper baffle are connected by 6 evenly distributed tie bars, the porous upper baffle The board and the perforated lower baffle are connected by 6 evenly distributed tie bars. The inner diameter D of the distributor cylinder is 540 mm, the diameter d of the large hole of the porous upper baffle is 360 mm, and the diameter of the circular small hole 6 mm, the opening rate is 40%, the circular hole diameter of the porous lower baffle is 8 mm, the opening rate is 35%, the lateral annular gap height H1 between the distributor cylinder and the porous upper baffle is 180 mm, and the lateral annular gap height H2 between the porous uppe...

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Abstract

The invention relates to a method for producing ethanediol from oxalic ester and hydrogen and mainly solves the problems in the prior art that reactants are not distributed uniformly and reflows after flowing through a gas pre-distributor at the position of an inlet of a fixed bed reactor, so that gas flow is not distributed uniformly in a catalyst bed layer of the reactor, a catalyst cannot be uniformly and sufficiently utilized, the conversion rate of the oxalic ester is low and the selectivity of the target product, namely the ethanediol, is low. By adopting the technical scheme that a mixture of a polar solvent and the ethanediol and hydrogen are used as raw materials, enter an axial flow fixed bed reactor with two stages of perforated baffle inlet gas pre-distributors under the gas phase condition and react with each other in the presence of a copper catalyst, the method well solves the problems and can be used in the industrial production of producing the ethanediol from the oxalic ester and the hydrogen, wherein the oxalic ester accounts for more than or equal to 10 mass percent of the mixture.

Description

technical field [0001] The invention relates to a method for producing ethylene glycol by hydrogenation of oxalate, in particular to a reactor using a two-stage open-hole baffle type inlet gas predistributor for hydrogenation of dimethyl oxalate or diethyl oxalate Process for producing ethylene glycol. Background technique [0002] Ethylene glycol (EG) is an important basic organic raw material in petrochemical industry. It can be mixed with water in any proportion, and has a high boiling point and a low freezing point. Mainly used in the production of polyester fibers, antifreeze, unsaturated polyester resins, lubricants, plasticizers, non-ionic surfactants and explosives, etc., in addition to coatings, photographic developers, brake fluids and inks and other industries, It is used as a solvent and medium for ammonium perborate, used in the production of special solvents such as glycol ether, etc., and has a wide range of uses. [0003] At present, the large-scale industr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/20C07C29/149B01J8/02
Inventor 孙凤侠刘俊涛王万民蒯骏
Owner CHINA PETROLEUM & CHEM CORP
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