A recovery method and recovery system for by-products in a dimethyl oxalate synthesis process

A technology of dimethyl oxalate and synthesis process, which is applied in the preparation of organic compounds, chemical instruments and methods, preparation of hydroxyl compounds, etc., can solve the problems of complex recovery process, high number of material cycles, and high recovery costs, and achieve efficient and clean recovery. The effect of the reaction process, reducing equipment investment and simplifying the process flow

Active Publication Date: 2021-08-17
高化学(江苏)化工新材料有限责任公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0012] The technical problem to be solved by the present invention is to provide a recovery method and recovery system for by-products in the dimethyl oxalate synthesis process, which solves the complex recovery process of by-products in the prior art dimethyl oxalate synthesis process and the recovery system The technical problems of many equipments, high cycle times of materials, low conversion rate of by-products, and high recovery cost

Method used

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  • A recovery method and recovery system for by-products in a dimethyl oxalate synthesis process

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Effect test

Embodiment 1

[0046] The mixed by-products collected by the recovery tower are mixed with the circulating hydrogen, and the circulating hydrogen volume is 30600 Nm 3 / h, the reaction pressure is 2.80 MPa, the reaction hydrogen-ester ratio is 60, and the reaction temperature is 200°C. The conversion rates of dimethyl carbonate and methyl formate were 99.8% and 99.9%, respectively. Methanol selectivity 100%, space-time yield STY: 1079 Kg / M 3 cata.h.

Embodiment 2

[0048] The mixed by-products collected by the recovery tower are mixed with the circulating hydrogen, and the circulating hydrogen volume is 30600 Nm 3 / h, the reaction pressure is 2.0 MPa, the reaction hydrogen-ester ratio is 60, and the reaction temperature is 160°C. The conversions of dimethyl carbonate and methyl formate were 95.1 and 96.2 %, respectively. Methanol selectivity 100%, space-time yield STY: 1029 Kg / M 3 cata.h.

Embodiment 3

[0050] The mixed by-products collected by the recovery tower are mixed with the circulating hydrogen, and the circulating hydrogen volume is 30600 Nm 3 / h, the reaction pressure is 2.0 MPa, the reaction hydrogen-ester ratio is 60, and the reaction temperature is 240°C. The conversions of dimethyl carbonate and methyl formate were 99.9 and 99.9 %, respectively. Methanol selectivity 100%, space-time yield STY: 1080 Kg / M 3 cata.h.

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Abstract

The invention discloses a method for recovering by-products in a synthesis process of dimethyl oxalate. A copper-based catalyst is used as a reaction catalyst to carry out ester hydrogenation reaction on dimethyl carbonate and methyl formate in the by-products of synthesis of dimethyl oxalate. Then make it all converted into methanol, and then heat exchange and cool the methanol, so that it can be recycled to be used in the synthesis step of dimethyl oxalate. The method omits the rectification and purification step of by-products in the dimethyl oxalate synthesis process, simplifies the process flow, reduces equipment investment and raw material input, and is an efficient and clean recovery reaction process. In addition, the present invention also discloses a recovery system for recovering by-products in the synthesis process of dimethyl oxalate. The equipment of the recovery system for by-products in the synthesis process of dimethyl oxalate is simple, and can realize the conversion and recovery of methanol , At the same time, the heat recovery utilization rate of this system is high, which is in line with the concept of energy saving and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of recovery and utilization of by-products in the synthesis process of dimethyl oxalate, and in particular relates to a recovery method and a recovery system for by-products in the synthesis process of dimethyl oxalate. Background technique [0002] Ethylene glycol is an important chemical raw material, mainly used in the manufacture of polyester fibers, antifreeze, nonionic surfactants, etc., and can also be used directly as a solvent. The "coal-to-ethylene glycol" process is a process that uses coal as raw material to obtain carbon monoxide (CO) and hydrogen (H 2 ). Among them, under the catalysis of noble metal catalysts, CO is synthesized and refined through oxo-coupling to obtain dimethyl oxalate (DMO), and then reacts with H under the action of the catalyst. 2 The process of hydrogenation reaction and purification to obtain polyester grade ethylene glycol. Compared with the traditional oil productio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/04C07C29/149C07C29/136
CPCC07C29/136C07C29/149C07C31/04Y02P20/10Y02P20/50
Inventor 王佳助姚斐丁继叶
Owner 高化学(江苏)化工新材料有限责任公司
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