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Method for preparing ethylene through liquid-phase selective hydrogenation of acetylene in slurry reactor

A technology of selective hydrogenation and slurry bed, applied in hydrogenation to hydrocarbons, bulk chemical production, organic chemistry, etc., can solve the problems of high energy consumption, uneconomical, complex process, etc. rate, the effect of improving selectivity

Inactive Publication Date: 2013-04-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is complex, energy-intensive, and uneconomical

Method used

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  • Method for preparing ethylene through liquid-phase selective hydrogenation of acetylene in slurry reactor
  • Method for preparing ethylene through liquid-phase selective hydrogenation of acetylene in slurry reactor
  • Method for preparing ethylene through liquid-phase selective hydrogenation of acetylene in slurry reactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A slurry bed reactor is used, which is filled with 100 ml N-methylpyrrolidone and 0.5 g catalyst, which is Pd / SiO prepared by impregnation method 2 , where the loading of Pd was 0.01 wt%. During the reaction, the rotational speed was 700 rpm. Among them, C4 is butane, 1-butene, cis-2-butene, trans-2-butene, 1,3-butadiene.

[0037] Operating temperature: 80°C,

[0038] Operating pressure: 0.1 MPa,

[0039] Operating air speed: 3600 ml / (gcat h),

[0040] Hydrogen to acetylene volume ratio: 6,

[0041] Detection method: GC7900, FID detector, capillary column.

[0042] Table 1 Experimental data table of Example 1

[0043]

[0044] The experiment was carried out for 100 h, and there was no obvious inactivation phenomenon.

Embodiment 2

[0046] A slurry bed reactor is used, which is filled with 100 ml N-methylpyrrolidone and 0.5 g catalyst, which is Pd / SiO prepared by impregnation method 2 , where the loading of Pd was 0.01 wt%. During the reaction, the rotational speed was 700 rpm. Among them, C4 is butane, 1-butene, cis-2-butene, trans-2-butene, 1,3-butadiene.

[0047] Operating temperature: 100°C,

[0048] Operating pressure: 0.1 MPa,

[0049] Operating air speed: 3600 ml / (gcat h),

[0050] Hydrogen to acetylene volume ratio: 10,

[0051] Detection method: GC7900, FID detector, capillary column.

[0052] Table 2 Example 2 Experimental Data Table

[0053]

[0054] The experiment was carried out for 100 h, and there was no obvious inactivation phenomenon.

Embodiment 3

[0056] A slurry bed reactor is used, which is filled with 100 ml N-methylpyrrolidone and 0.5 g catalyst, which is Pd / SiO prepared by impregnation method 2 , where the loading of Pd was 0.01 wt%. During the reaction, the rotational speed was 700 rpm. Among them, C4 is butane, 1-butene, cis-2-butene, trans-2-butene, 1,3-butadiene.

[0057] Operating temperature: 100°C,

[0058] Operating pressure: 0.1 MPa,

[0059] Operating air speed: 8000 ml / (gcat h),

[0060] Hydrogen to acetylene volume ratio: 10,

[0061] Detection method: GC7900, FID detector, capillary column.

[0062] Table 3 Example 3 experimental data table

[0063]

[0064] The experiment was carried out for 100 h, and there was no obvious inactivation phenomenon.

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Abstract

The invention belongs to the technical field of chemical material preparing methods, and particularly relates to a method for preparing ethylene through liquid-phase selective hydrogenation of acetylene in a slurry reactor. A liquid-phase solvent with high selective solubility for acetylene and low selective solubility for ethylene is introduced into a gas-solid catalytic system, and the relative solubility coefficient of the solvent is larger than 8; a catalyst is dispersed evenly in the liquid-phase solvent, and process coupling is achieved through the high selective solubility of the liquid-phase solvent for acetylene, so that the selectivity of ethylene is improved; and ethylene is prepared and separated through an hydrogenation reaction of acetylene. According to the method, the concentration of ethylene on the surface of the catalyst is reduced through the process coupling, therefore a path of ethane generation through deep hydrogenation is blocked to a certain extent, and the selectivity of ethylene can be improved remarkably. Simultaneously, the liquid-phase dilution thermal effect can accelerate heat transfer in the slurry reactor, and temperature runaway is avoided. The method is not only used for preparing ethylene from acetylene obtained from natural gas pyrolysis, but also is an efficient method in a process for removing acetylene in ethylene.

Description

technical field [0001] The invention belongs to the technical field of chemical material preparation methods, in particular to a method for preparing ethylene by liquid-phase selective hydrogenation of acetylene in a slurry bed. Background technique [0002] Ethylene is an important basic raw material in modern industry, and it is also one of the most produced chemicals in the world. In 2010, the domestic output of ethylene has exceeded 14 million tons. Ethylene is mainly produced by the cracking of petroleum hydrocarbons. Petroleum is a scarce non-renewable resource, and its price fluctuates greatly with changes in the international environment. At present, my country's annual petroleum consumption ranks second in the world. The dependence rate has reached 56.5%, which poses a serious strategic threat to our country, which is not rich in oil reserves. Therefore, seeking another new source and process method to prepare a large amount of basic organic chemical raw material - ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C5/05
CPCY02P20/52
Inventor 王铁峰侯瑞君
Owner TSINGHUA UNIV
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