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Optimized reaction technology producing ethylene-glycol by adding hydrogen in oxalate

A technology of oxalate ester and ethylene glycol, which is applied in organic chemistry, chemical instruments and methods, preparation of hydroxyl compounds, etc., can solve the problems of increased equipment investment, complex processing equipment process, large heat load of air cooler, etc., and achieve equipment saving The effect of investment

Inactive Publication Date: 2015-02-18
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Description
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AI Technical Summary

Problems solved by technology

my country is the largest consumer of ethylene glycol, but its self-sufficiency rate is less than 30%, and most manufacturers adopt foreign petroleum ethylene route technology. The consumption is high, and the price of oil and its downstream products seriously affects the production cost. With the increasing scarcity of oil resources, this route will face severe challenges
However, the heat utilization of this process is still incomplete, the heat load entering the air cooler is large, the energy consumption increases, and the preheating of oxalate needs to use a separate heating equipment, which increases equipment investment

Method used

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  • Optimized reaction technology producing ethylene-glycol by adding hydrogen in oxalate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Charge 4 L of Cu / SiO in the middle of the hydrogenation reactor 2 Catalyst, both ends of the reactor are equipped with fillers of the same particle size as the catalyst, such as porcelain rings, diethyl oxalate is used as the raw material, the hydrogenation reaction temperature is 220 ° C, and the reaction pressure is 3.0 MPa (gauge pressure).

[0031] The system fills in hydrogen 1 with a flow rate of 1.3 Nm 3 / h, the temperature is 60°C, the pressure is 3.2MPa, after mixing with the recycle gas, 2 passes through the heat exchange of E101 to reach 139°C, and enters from the top of the T101 vaporization tower.

[0032] The raw material diethyl oxalate 4 added to the system has a flow rate of 2kg / h, a pressure of 3.05MPa, and a temperature of 139.0°C. It is mixed with the oxalate ester circulating in the vaporization tower tank and then mixed with the mixed gas and flows into the vaporizer for vaporization.

[0033] The mixed gas 6 flow rate from the vaporizer is 42.5Nm ...

Embodiment 2

[0035] Charge 4 L of Cu / SiO in the middle of the hydrogenation reactor 2 Catalyst, the two ends of the reactor are equipped with fillers of the same particle size as the catalyst, such as porcelain rings, diethyl oxalate is used as the raw material, the hydrogenation reaction temperature is 210 ° C, and the reaction pressure is 2.51 MPa (gauge pressure).

[0036] The system fills in hydrogen 1 with a flow rate of 1.27 Nm 3 / h, the temperature is 83°C, the pressure is 2.53MPa, after being mixed with the recycle gas, 2 passes through the E101 heat exchange to reach 140.0°C, and enters from the top of the T101 vaporization tower.

[0037] The raw material diethyl oxalate 4 fed into the system has a flow rate of 2.0kg / h, a pressure of 2.53MPa, and a temperature of 140.0°C. After mixing with the oxalate ester circulated in the vaporization tower, 5 and the mixed gas 3 flow into the vaporization tower for vaporization.

[0038] The flow rate of mixed gas 6 coming out of the vaporiz...

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Abstract

The invention belongs to the field of chemical engineering, and relates to a production technology for ethylene-glycol, in particular to an optimized reaction technology producing ethylene-glycol by adding hydrogen in oxalate. The technology comprises the following steps: adding a raw material oxalate in a vaporization tower directly first; circulating the oxalate in the tower; enabling the oxalate and heated circulating gas in the tower to conduct continuous gas-liquid contact; gradually increasing temperature to a vaporization temperature; taking the oxalate after vaporization and the circulating gas as reaction gas for preheating; pumping the oxalate and the circulating gas in a reactor; heating reaction gas by the product gas after reaction; generating vapor as a byproduct by surplus heat after temperature reduction; reducing the temperature to the temperature required by the inlet of a circulating compressor through air cooling or water cooling. Through the adoption of the technology, equipment investment can be reduced effectively; energy consumption and cost are reduced.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a production process of ethylene glycol, in particular to an optimized reaction process for preparing ethylene glycol from oxalate ester hydrogenation. Background technique [0002] Ethylene glycol (EG) is an important basic chemical raw material, which can be used to produce unsaturated polyester resin, polyester fiber, coating, antifreeze, plasticizer, nonionic surfactant, etc. my country is the largest consumer of ethylene glycol, but its self-sufficiency rate is less than 30%, and most manufacturers adopt foreign petroleum ethylene route technology. The consumption is high, and the price of oil and its downstream products seriously affects the production cost. With the increasing scarcity of oil resources, this route will face severe challenges. [0003] According to my country's national conditions, there is less oil and more coal, so the process route for the synthesis of ethy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/149
CPCC07C29/149C07C29/76C07C29/80C07C31/202
Inventor 胡玉容李扬王科范鑫胡文励
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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