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Method for preparing ethylene carbonate by using CO gas phase method

A technology of dimethyl carbonate and gas phase method, which is applied in chemical instruments and methods, preparation of organic compounds, preparation of carbonate/haloformate, etc., can solve the problem of low utilization rate of nitrogen oxide or methyl nitrite, Low selectivity and other problems, to achieve the effect of high selectivity, high reaction rate and low cost

Inactive Publication Date: 2012-08-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is the low technical problem of nitric oxide or methyl nitrite utilization rate and low selectivity existing in the literature in the past, and a new method for preparing dimethyl carbonate by CO gas phase method is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025]Sodium nitrite, water, methanol and sulfuric acid first enter the reactor I to generate effluent I containing methyl nitrite; the effluent II of methyl nitrite obtained after separation of the effluent enters the coupling reaction with CO gas The reactor, in contact with the palladium-containing catalyst, reacts to generate dimethyl carbonate effluent III and NO-containing effluent IV; NO-containing effluent IV enters reactor II with methanol and oxygen for oxidative esterification to generate methyl nitrite The effluent V, the methyl nitrite effluent VI obtained after the effluent is separated returns, and the effluent II and CO gas of methyl nitrite enter the coupling reactor to continue the reaction; wherein, the reactor I and the reactor II are all rotating high-gravity reactors; palladium-containing catalyst, the palladium content is 0.5% based on the weight of the catalyst carrier. The mol ratio of water and sodium nitrite in reactor I is 2: 1, the mol ratio of met...

Embodiment 2

[0027] According to the flow process of [embodiment 1], only containing palladium catalyst wherein, palladium content is 0.8% by catalyst carrier weight. The mol ratio of water and sodium nitrite in reactor I is 15: 1, the mol ratio of methyl alcohol and sulfuric acid is 3: 1, the mol ratio of sulfuric acid and sodium nitrite is 3: 1, and reaction temperature is 20 ℃, and reaction pressure is -0.02MPa, the reaction contact time is 0.1 seconds; the reaction temperature of reactor II is 50°C, the reaction pressure is -0.02MPa, the reaction contact time is 0.08 seconds, the molar ratio of NO to methanol and oxygen in the NO-containing effluent IV 1:5:0.22; the reaction temperature of the coupling reactor is 120°C, the reaction contact time is 10 seconds, the reaction pressure is -0.01MPa, and the molar ratio of CO gas to methyl nitrite is 0.6:1; Reactor I And the rotating speed of the rotor of the high gravity reactor of reactor II is under the condition of 1000rpm, and its resul...

Embodiment 3

[0029] According to the flow process of [embodiment 1], only containing palladium catalyst wherein, palladium content is 0.8% by catalyst carrier weight. The mol ratio of water and sodium nitrite in reactor I is 2: 1, the mol ratio of methyl alcohol and sulfuric acid is 2: 1, the mol ratio of sulfuric acid and sodium nitrite is 0.3: 1, at reaction temperature, be 30 ℃, reaction pressure is -0.05MPa, the contact time is 1 second; the reaction temperature of the reactor II is 80°C, the reaction pressure is 0.2MPa, the reaction contact time is 2 seconds, and the molar ratio of NO, methanol and oxygen in the NO-containing effluent IV is 1:10:0.15; the reaction temperature of the coupling reactor is 140°C, the reaction contact time is 60 seconds, the reaction pressure is 1.0MPa, and the molar ratio of CO gas to methyl nitrite is 2:1; the reactor I and the reaction Under the condition that the rotating speed of the rotor of the rotating supergravity reactor of device II is 2000rpm, ...

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Abstract

The invention relates to a method for preparing ethylene carbonate by using a CO gas phase method and mainly solves the technical problems of low nitric oxide or ethylene carbonate utilization rate and low selectivity existing in the prior art. With the adoption of the technical scheme that the method for preparing the ethylene carbonate by using the CO gas phase method comprises the following steps that: a), the ethylene carbonate, water, methanol and sulfuric acid or nitric acid firstly enter a reactor I, and an effluent II containing methyl nitrite is obtained after a generated effluent is separated; and b), the effluent II and CO gas enter a coupling reactor, a generated NO-contained effluent IV is reacted with the methanol and oxygen in a reactor II, and an effluent VI containing the methyl nitrite obtained after the generated effluent is separated flows back and is continuously reacted with the effluent II and the CO gas in the coupling reactor, wherein the reactor I and the reactor II are rotary super-gravity reactors, so the problems are better solved. The method can be used in the industrial production for preparing the ethylene carbonate by using the CO gas phase method.

Description

technical field [0001] The present invention relates to a method for preparing dimethyl carbonate by CO gas-phase method, in particular to CO coupling to prepare dimethyl carbonate, which greatly reduces the consumption of nitrogen oxides or methyl nitrite and prepares dicarbonate by CO gas-phase method. Methyl ester method. Background technique [0002] Dimethyl carbonate is referred to as DMC for short. It is a colorless, transparent, slightly odorous, slightly sweet liquid at room temperature, with a melting point of 4°C, a boiling point of 90.1°C, and a density of 1.069g / cm 3 , hardly soluble in water, but miscible with almost all organic solvents such as alcohols, ethers, and ketones. DMC is very low in toxicity and was listed as a non-toxic product in Europe in 1992. It is an environmentally friendly chemical raw material that meets the requirements of modern "clean technology". Therefore, the synthesis technology of DMC has received extensive attention from the chemi...

Claims

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Application Information

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IPC IPC(8): C07C69/96C07C68/00
Inventor 刘俊涛王万民刘国强
Owner CHINA PETROLEUM & CHEM CORP
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