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System for treating and recovering dimethyl oxalate

A technology of dimethyl oxalate and recovery system is applied in the field of systems for processing dimethyl oxalate crystallization and recovery, and can solve problems such as affecting the normal operation of the system, reducing the efficiency of producing ethylene glycol, and being inconvenient.

Active Publication Date: 2014-08-20
PUJING CHEM IND SHA
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Although the above two methods can solve the problem of crystallization to a certain extent, they are very inconvenient, seriously affect the normal operation of the system, and reduce the efficiency of producing ethylene glycol

Method used

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  • System for treating and recovering dimethyl oxalate

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Embodiment Construction

[0014] Below in conjunction with accompanying drawing, describe in further detail:

[0015] Such as figure 1 As shown, the system includes the carbonylation reaction system commonly used in the prior art, and the DMO described in the present invention is the abbreviation of dimethyl oxalate, and the input end of the carbonylation reaction system is connected with the nitrogen main pipe 1 and the hydrogenation reaction system respectively. 11 connected, the carbonylation reaction system includes DMO scrubber 3, scrubber reboiler 4, circulating cooler 5, DMO crude product tank 6, DMO recovery tower 7, recovery tower reboiler 8 and DMO product tank 9, The devices are connected with each other by pipelines, and the pipelines are made of aluminum profiles. There are 1 to 3 valves on the connecting pipelines of each device. The system also includes a gas heater and a DMO recovery tank 10, because other inert gases are used in industrial production. It is not easy to extract, so...

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Abstract

The invention provides a treatment and recovery system of dimethyl oxalate, the system comprises a carbonylation reaction system, and the carbonylation reaction system comprises a DMO scrubber, a DMO recovery tower, a circulating cooler, a recovery tower reboiler, DMO product tank, scrubber reboiler, DMO crude product tank, nitrogen heater and DMO recovery tank, the devices are connected to each other through pipelines, the output end of the carbonylation reaction system and the input end of the hydrogenation reaction system connected, the input end of the nitrogen heater, the output end of the nitrogen heater is connected to the output end of the nitrogen main pipe used to input nitrogen, and the input port of the DMO recovery tank is connected to each device in the carbonylation reaction system through pipelines Connected; the connecting pipeline between the DMO recovery tank and the DMO crude product tank is provided with a circulating pump. The nitrogen heater in the present invention can enable the whole system to automatically deal with the problem of dimethyl oxalate crystallization, which is very convenient and does not affect the operation of the whole process.

Description

technical field [0001] The invention relates to a treatment and recovery system in the ethylene glycol production process, in particular to a system capable of processing and recovering dimethyl oxalate crystallization. Background technique [0002] The main process of preparing ethylene glycol from synthesis gas is as follows: Coupling, regeneration, and catalytic cycle of CO gas phase to produce dimethyl oxalate (DMO for short) with the participation of methyl nitrite, and hydrogenation of DMO to generate ethylene glycol (EG for short). Pure ethylene glycol is obtained by separation by rectification. [0003] The reaction formula of dimethyl oxalate is CO + 2CH 3 ONO —→ (COOCH 3 ) 2 + 2NO [0004] It uses CO as a raw material, with the participation of strong oxidant MN, the reaction temperature is 120-140 ° C, under normal pressure, and the catalyst is Pd / Al 2 o 3 , the reactor is a fixed bed reactor. [0005] The side reaction produces dimethyl carbonate (DMC), w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/36C07C67/48
Inventor 孙虎
Owner PUJING CHEM IND SHA
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