Method and device for preparing ethylene glycol by hydrogenating dimethyl oxalate

A technology of dimethyl oxalate and ethylene glycol, which is applied in the preparation of carboxylate, chemical instruments and methods, preparation of hydroxyl compounds, etc., can solve the problems of easy deactivation of catalyst, high manufacturing cost, complex structure of isothermal reactor, etc.

Inactive Publication Date: 2019-11-22
ECO ENVIRONMENTAL ENERGY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] As mentioned in CN104841339A, tube and tube reactors are generally used in industry to deal with the problem of narrow operating temperature. Isothermal reactors generally have complex structures and higher m

Method used

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  • Method and device for preparing ethylene glycol by hydrogenating dimethyl oxalate
  • Method and device for preparing ethylene glycol by hydrogenating dimethyl oxalate
  • Method and device for preparing ethylene glycol by hydrogenating dimethyl oxalate

Examples

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Effect test

Embodiment 1

[0073] Example 1 in such as figure 1 carried out in the described device. The hydrogenation reaction of dimethyl oxalate was carried out using two adiabatic reactors. In the first stage of reaction, a low hydrogen ester ratio (H 2 : DMO=30), carry out at low temperature (180°C), reduce the reaction depth, and control the overall reaction heat release. About 40% of the dimethyl oxalate reacts in primary reactor 1 to form methyl glycolate (primary) and ethylene glycol (secondary). The adiabatic temperature rise in the primary reactor 1 is 20.1°C, and the outlet temperature of the primary reactor 1 is 200.1°C, which is the same as the optimum hydrogenation reaction temperature in the mainstream process. The primary reaction product is mixed with hydrogen to form a mixture with a hydrogen-to-ester ratio of 80, and then enters the secondary reactor 2 to hydrogenate the remaining dimethyl oxalate and the methyl glycolate generated in the primary reactor 1 to obtain Secondary re...

Embodiment 2

[0079] The hydrogenation reaction of dimethyl oxalate in Example 2 was carried out using two adiabatic reactors. The first stage reaction was carried out in primary reactor 1 at 200° C. with a hydrogen-to-ester ratio of 50. The adiabatic temperature rise in the primary reactor is 25.3°C, and the primary reaction product at the outlet of the primary reactor passes through a heat exchanger for heat exchange and cooling, and the temperature after cooling is 200°C. The cooled primary reaction product is mixed with hydrogen, the hydrogen-ester ratio is adjusted to an appropriate ratio, and then the hydrogenation reaction is carried out in the secondary reactor to obtain a secondary reaction product containing ethylene glycol.

[0080] Example 2 utilizes two different catalysts to hydrogenate dimethyl oxalate. The catalyst InNi / Ni used in the first step of hydrogenation mainly hydrogenates dimethyl oxalate to generate methyl glycolate. The catalyst used in the second step of hydroge...

Embodiment 3

[0085] The dimethyl oxalate hydrogenation reaction of embodiment 3 utilizes three adiabatic reactors to carry out, and reaction device is as figure 2As shown, the three reactors all use the same catalyst InNiC0.5 / Ni. The first stage of reaction was carried out in the primary reactor 1 at 180° C. with a hydrogen-to-ester ratio of 30 to obtain primary reaction products. Then, the primary reaction product is mixed with hydrogen 1, and after adjusting the ratio of hydrogen to ester to an appropriate ratio, hydrogenation reaction is carried out in the secondary reactor 2 to obtain the first secondary reaction product. The first secondary reaction product continues to be mixed with hydrogen 2, and after adjusting the hydrogen-ester ratio to an appropriate ratio, hydrogenation reaction is carried out in the secondary reactor 3 to obtain a second secondary reaction product containing ethylene glycol.

[0086] By controlling the reaction conditions, the adiabatic temperature rise is ...

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Abstract

The invention provides a method and a device for preparing ethylene glycol by hydrogenating dimethyl oxalate. A nickel-based catalyst is adopted to improve the upper limit temperature of a catalyst operation temperature window; meanwhile, multi-stage reaction is adopted, so that the amount of circulating hydrogen can be reduced, and the energy consumption of the circulating compressor is reduced;the device can adopt an adiabatic reactor, so that the equipment cost can be reduced.

Description

technical field [0001] The invention relates to a method and a device for preparing ethylene glycol by hydrogenating dimethyl oxalate, in particular to a method and a device for preparing ethylene glycol by hydrogenating dimethyl oxalate in stages under adiabatic conditions. Background technique [0002] Ethylene glycol is an important chemical raw material, mainly used in various production fields such as polyester fiber (PET), antifreeze, ethanolamine and explosives, and is also widely used as a solvent, lubricant and plasticizer, and has a wide range of industrial uses . Industrially, ethylene glycol is mainly produced by petroleum route, ethylene oxide is produced by gas-phase oxidation, and then ethylene glycol is produced by liquid-phase catalytic hydration. With the rise of international oil prices in recent years, the pressure on the ethylene glycol industry chain that uses ethylene as raw material to produce ethylene glycol is gradually increasing. In addition, th...

Claims

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Application Information

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IPC IPC(8): C07C29/149C07C31/20
CPCC07C29/149C07C67/31C07C31/202C07C69/675
Inventor 徐彬冯锦迪萧锦诚
Owner ECO ENVIRONMENTAL ENERGY RES INST
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