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Method for preparing dialkyl carbonates

A technology of carbonic acid diester and compound, applied in the field of preparing carbonic acid diester, can solve the problem of low production capacity and the like

Active Publication Date: 2008-12-17
CHINA PETROCHEM DEVMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production capacity of the above-mentioned processes is not high, and all need to use a large amount of catalyst

Method used

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  • Method for preparing dialkyl carbonates
  • Method for preparing dialkyl carbonates
  • Method for preparing dialkyl carbonates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Listed according to Table 1, methyl alcohol, cuprous chloride, 2-methylimidazole cocatalyst and chloride 1-butyl-3-methylimidazolium salt ([Bmim][Cl]) ionic liquid are placed in a stirring In a 1L stainless steel high-pressure reactor with Teflon as the lining material, and replace the air in the reactor with nitrogen, pressurize to 25kg / cm 2 Nitrogen gas was not introduced thereafter. Next, start the stirrer, and after the temperature of the reaction system rises to 120° C., start to introduce the mixed gas containing carbon monoxide and oxygen into the reactor. The concentration of cuprous chloride catalyst was 16492 ppm. After the reaction continued for 1 hour, the obtained product was analyzed by gas chromatography and the yield, conversion and selectivity were calculated, and the results were recorded in Table 1.

Embodiment 2 to 9

[0040] According to list in Table 1, change the kind and addition amount of cocatalyst and / or ionic liquid, repeat the step of embodiment 1. After the reaction continued for 1 hour, the obtained product was analyzed by gas chromatography and the yield, conversion and selectivity were calculated, and the results were recorded in Table 1.

[0041] Table 1

[0042] comparative example

1

comparative example

2

Example

1

Example

2

Example

3

Example

4

Example

5

Example

6

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7

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8

Example

9

Methanol (wt%)

97.3

91.2

80.4

79.4

78.5

7.5

80.8

79.1

77.2

77.7

72.3

Cuprous chloride (wt%)

2.7

2.7

2.7

2.7

2.7

2.7

2.7

2.7

2.7

2.7

2.7

2-Methylimidazole (wt%)

6.1

6.1

6.1

6.1

6...

Embodiment 10

[0049] Listed according to Table 2, methyl alcohol, cuprous chloride, 2-methylimidazole cocatalyst and chloride 1-butyl-3-methylimidazolium salt ([Bmim][Cl]) ionic liquid are placed in a stirring In a 1L stainless steel high-pressure reactor with Teflon as the lining material, and replace the air in the reactor with nitrogen, pressurize to 25kg / cm 2 Nitrogen gas was not introduced thereafter. Next, start the stirrer, and after the temperature of the reaction system rises to 120° C., start to introduce the mixed gas containing carbon monoxide and oxygen into the reactor. The concentration of cuprous chloride catalyst was 16492 ppm. After the reaction continued for 1 hour, the obtained product was analyzed by gas chromatography and the yield, conversion and selectivity were calculated, and the results were recorded in Table 2.

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Abstract

The invention relates to a preparation method of diester carbonate. The diester carbonate is produced through oxidation and carbonylation reaction of alcohols compound under the condition of the existence of a carbon monoxide, oxygen and liquid phase catalyzing system, wherein, the liquid phase catalyzing system contains a catalyst, at least one cocatalyst and at least one ion liquid consists of a positive ion and a negative ion, and the positive ion of the ion liquid has a nitrogen heterocyclic ring structure. The preparation method of the invention mainly uses the cocatalyst and ion liquid to enhance the activity of the catalyst and to further improve the catalysis efficiency, and has effects of improving reaction rate and increasing yield.

Description

technical field [0001] The invention relates to a method for preparing carbonic acid diester, in particular to a method for preparing carbonic acid diester by using an alcohol compound. Background technique [0002] Organic carbonic acid diesters can be used as monomers for synthesizing lubricants, solvents, plasticizers, and plexiglass, and are used in methylation and carbonylation reactions, such as the preparation of isocyanate, polyurethane, and polycarbonate. It can also be used as an additive for gasoline or other heavy fuels to improve its antiknock performance. [0003] Traditionally, phosgene synthesis is used to manufacture organic carbonates. Because phosgene is highly toxic and easy to corrode equipment, it has been gradually replaced by oxidative carbonylation in recent years. This new method for synthesizing organic carbonates from alcohols, oxygen and carbon monoxide has the advantages of easy-to-obtain raw materials, simple synthesis method, low pollution a...

Claims

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Application Information

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IPC IPC(8): C07C69/96C07C68/06B01J31/02
Inventor 陈民升蔡嘉荣张芷维
Owner CHINA PETROCHEM DEVMENT
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