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Catalyst for ethylene glycol synthesis through gas phase hydrogenation of dimethyl oxalate, preparation method and applications thereof

A dimethyl oxalate and catalyst technology, applied in the field of catalysts, can solve the problems of high reaction hydrogen ester, low product selectivity, low liquid hourly space velocity, etc.

Inactive Publication Date: 2017-04-26
SHANGHAI HUAYI ENERGY CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By analyzing and summarizing the above-mentioned patents, it is found that the main problems of oxalate hydrogenation catalysts are: high reaction hydrogen ester ratio, low liquid hourly space velocity, low product selectivity, short catalyst life, etc.

Method used

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  • Catalyst for ethylene glycol synthesis through gas phase hydrogenation of dimethyl oxalate, preparation method and applications thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Prepare the catalyst of gas-phase hydrogenation of dimethyl oxalate to synthesize ethylene glycol, the active component is the oxide of CuO and Ni metal promoter, the carrier is silicon dioxide, the Cu element accounts for 20wt% of the total weight of the catalyst, the Ni metal promoter element Accounting for 3wt% of the total weight of the catalyst, the balance is carrier silica, and the preparation method is as follows:

[0055] Weigh copper nitrate (Cu(NO 3 ) 2 ·3H 2 O) 30g, nickel nitrate (Ni(NO 3 ) 2 ·6H 2 (2) 5.9g, add 400ml deionized water to dissolve; Add dropwise concentrated ammonia water, form ammonia complex aqueous solution, control pH value about 11.5; Add white carbon black 28.25g again, mechanical stirring aging 8 hours; Elevate system water bath temperature to 85 DEG C, distill ammonia for 2 to 3 hours until the pH is 6.5 and stop, the catalyst mother liquor becomes a gel state; filter and wash to obtain the catalyst filter cake; add organic modifi...

Embodiment 2

[0058] Preparation of dimethyl oxalate gas phase hydrogenation synthesis of ethylene glycol catalyst, the active component is the oxide of CuO and Ni metal promoters, the carrier is silicon dioxide, the Cu element accounts for 30wt% of the total weight of the catalyst, and the Ni metal promoter element accounts for 3wt% of the total weight of the catalyst, and the balance is carrier silica, the preparation method is as follows:

[0059] Weigh copper nitrate (Cu(NO 3 ) 2 ·3H 2 O) 50g, nickel nitrate (Ni(NO 3 ) 2 ·6H 2 (2) 6.5g, add 400ml deionized water to dissolve; Drop concentrated ammonia water, be made into ammonia complex solution, control pH value about 12.5; Add white carbon black 26g again, mechanical stirring aging 8 hours; Elevate system water bath temperature to 85 DEG C, steam ammonia for 2 to 3 hours until the pH is 6.0 and stop, the catalyst mother liquor becomes a gel state; filter and wash to obtain the catalyst filter cake; add organic modifier polyethylen...

Embodiment 3

[0062] Preparation of dimethyl oxalate gas phase hydrogenation synthesis of ethylene glycol catalyst, the active component is the oxide of CuO and Ni metal promoter, the carrier is silicon dioxide, Cu element accounts for 40wt% of the total weight of the catalyst, Ni metal promoter element accounts for 3wt% of the total weight of the catalyst, and the balance is carrier silica, the preparation method is as follows:

[0063] Weigh copper nitrate (Cu(NO 3 ) 2 ·3H 2 O) 70g, nickel nitrate (Ni(NO 3 ) 2 ·6H 2 (2) 6.9g, add 400ml deionized water to dissolve; Drop concentrated ammonia water, be made into ammonia complex solution, control pH value about 11.0; Add white carbon black 21g again, mechanical stirring aging 8 hours; Elevate system water bath temperature to 85°C, distill ammonia for 2-3 hours until the pH is 7.5 and stop, the catalyst mother liquor becomes gel state; filter and wash to obtain catalyst filter cake; add organic modifier polyethylene glycol 1.1g (white 5w...

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Abstract

The present invention relates to a catalyst for ethylene glycol synthesis through gas phase hydrogenation of dimethyl oxalate, a preparation method and applications thereof. The catalyst comprises CuO, a metal auxiliary agent oxide and silica, wherein the Cu element accounts for 10-50% of the total weight of the catalyst, and the metal auxiliary agent element accounts for 1-10% of the total weight of the catalyst. The invention further discloses the preparation method of the catalyst. According to the present invention, a soluble copper salt and a metal auxiliary agent soluble salt are used and are added with ammonia water to form an ammonia complex aqueous solution, aging-ammonia evaporation and co-precipitating are performed, and the obtained material and silica form the gel so as to form the stable chemical structure, such that the stability of the catalyst is substantially improved; during the preparation process, the organic modifier is added so as to effectively improve the pore structure and the specific surface area of the catalyst, and improve the activity of the catalyst and the ethylene glycol selectivity; and with the application of the catalyst in the dimethyl oxalate hydrogenation reaction, the service life is more than one year, the average conversion rate of dimethyl oxalate is more than 99.9%, and the ethylene glycol selectivity is more than 95%.

Description

technical field [0001] The invention relates to a catalyst for synthesizing ethylene glycol by gas-phase hydrogenation of dimethyl oxalate, a preparation method and application thereof, and belongs to the technical field of catalysts. Background technique [0002] Ethylene glycol, also known as glycol, is a colorless, odorless, sweet liquid, and is an important basic raw material for petrochemicals. It can be used in the manufacture of polyester fibers, plastics, rubber, antifreeze, unsaturated polyester resins, nonionic surfactants, ethanolamine, and explosives. It can also be used to prepare low-freezing point coolants and solvents. It has a wide range of uses. [0003] At present, the main method of industrial synthesis of ethylene glycol at home and abroad is the traditional petroleum route, that is, the oxidation of ethylene to ethylene oxide (EO), and then the hydration of ethylene oxide to ethylene glycol. This production method has insurmountable shortcomings, mainl...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J23/75B01J23/80B01J23/72C07C29/149C07C31/20
CPCB01J23/002B01J23/72B01J23/75B01J23/755B01J23/80B01J2523/00C07C29/149B01J2523/17B01J2523/847B01J2523/41B01J2523/845B01J2523/48B01J2523/27C07C31/202Y02P20/52
Inventor 梁铁王群郭平均山炜巍施春辉肖本端金生亚
Owner SHANGHAI HUAYI ENERGY CHEM
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