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Method for hydrogenated preparation of ethylene glycol by oxalic ester

A technology of oxalate ester and ethylene glycol, which is applied in chemical instruments and methods, preparation of hydroxyl compounds, and preparation of organic compounds, etc. It can solve the problem of low selectivity of the target product ethylene glycol, uneven use of catalysts, and poor catalyst stability and other issues to achieve the effect of improving selectivity and yield, protecting reaction performance, and improving conversion rate

Active Publication Date: 2013-12-04
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, the selectivity of the target product ethylene glycol is low and the stability of the catalyst is poor, and a new hydrogenation production of oxalate is provided. Ethylene glycol method

Method used

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  • Method for hydrogenated preparation of ethylene glycol by oxalic ester
  • Method for hydrogenated preparation of ethylene glycol by oxalic ester
  • Method for hydrogenated preparation of ethylene glycol by oxalic ester

Examples

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Embodiment 1

[0030] according to Figure 4 and Figure 5 , the reaction adopts two axial flow fixed-bed reactors connected in series, the inner diameters of the first reactor and the second reactor are both 2 meters, and the inner diameter of the feed port is D in Both are 350 mm, all adopt such as Figure 5 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 ...

Embodiment 2

[0032] according to Figure 4 with Figure 5 , the reaction adopts two axial flow fixed-bed reactors connected in series, the inner diameters of the first reactor and the second reactor are 4 meters, and the inner diameter of the feed port is D in Both are 700 mm, all adopt such as Figure 5 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 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 d...

Embodiment 3

[0034] according to Figure 4 with Figure 5 , the reaction adopts two axial flow fixed-bed reactors in series, the inner diameter of the first reactor and the second reactor is 3.4 meters, and the inner diameter of the feed port is D in Both are 600 mm, all adopt such as Figure 5 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...

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Abstract

The invention relates to a method for the hydrogenated preparation of ethylene glycol by oxalic ester, which mainly solves the problems in the prior art that reactant fluids are distributed unevenly through a catalyst bed of a reactor, catalyst cannot be utilized sufficiently and evenly, the conversion rate of oxalic ester is low and the target product, i.e. ethylene glycol, has low selectivity and inferior catalyst stability. The method in which the oxalic ester is used as raw material and polar solvent is used as solvent comprises the following steps that: (a) the raw material, the solvent and nitrogen firstly enter a first fixed bed reactor to have a catalyzed reaction with a copper catalyst in order to generate a first reaction fluid containing ethylene glycol; and (b) the first reaction fluid and the hydrogen enter at least one second fixed bed reactor to have a catalyzed reaction with the copper catalyst in order to generate a second reaction fluid containing ethylene glycol; a two-stage porous baffle-type gas pre-distributor is installed at an inlet of the fixed bed reactor, solving the problems greatly, and the method can be used for the industrial hydrogenated production of ethylene glycol by oxalic ester.

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): C07C31/20C07C29/149B01J8/04
CPCY02P20/52
Inventor 孙凤侠刘俊涛蒯骏朱志焱
Owner CHINA PETROLEUM & CHEM CORP
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