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System and method for preparing ethylene through acetylene hydrogenation

A technology for acetylene hydrogenation and ethylene production, which is applied in the system field of acetylene hydrogenation to ethylene, which can solve the problems of noble metal catalyst deactivation, low precision of acetylene purification process, and catalyst activity decline, so as to avoid green oil accumulation and reduce occupation Land and investment, the effect of state stability

Pending Publication Date: 2017-05-10
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a system and method for hydrogenation of acetylene to ethylene, so as to avoid the reduction of catalyst activity caused by the accumulation of green oil, and at the same time avoid the low precision of the existing acetylene purification process, and the highly dispersed noble metal catalysts are easily affected by trace impurities And deactivation, and high hydrogen-alkyne ratio raw material gas compression defects

Method used

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  • System and method for preparing ethylene through acetylene hydrogenation
  • System and method for preparing ethylene through acetylene hydrogenation
  • System and method for preparing ethylene through acetylene hydrogenation

Examples

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Embodiment 1

[0100] The invention provides a method for producing ethylene by hydrogenation of high-purity acetylene, the process of which is as follows:

[0101] Mix the catalyst diluent aluminum oxide with a particle size of 100 mesh to 150 mesh and the acetylene hydrogenation catalyst according to the mass ratio of 1:1, and then add it into the slurry bed and mix it with the solvent N-methyl pyrrolidone to form a slurry.

[0102] The reaction gas enters the slurry through the internal gas distributor of the slurry bed, the molar ratio of hydrogen to acetylene in the slurry bed is 5:1, and the reaction is carried out at 170°C. After the reaction, the gas phase material is subjected to cryogenic separation to obtain the target product ethylene, and the recovered hydrogen is mixed with the raw material hydrogen and returned to the hydrogenation reaction unit. The liquid phase material is passed through the rotary drum vacuum filter to obtain solid phase material and liquid phase material. ...

Embodiment 2

[0104] Using the system of the present invention, the process of hydrogenation of high-purity acetylene to ethylene of the present invention is:

[0105] Mix the catalyst diluent aluminum oxide with a particle size of 100 mesh to 150 mesh and the acetylene hydrogenation catalyst according to the mass ratio of 2:1, and then add it into the slurry bed and mix it with the solvent N-methyl pyrrolidone to form a slurry. Acetylene and hydrogen are mixed and pressurized through a compressor at a molar ratio of 1:1 to form a mixed gas, and the pressure is raised to 0.18MPa, the temperature is 60°C, and the dew point is -44°C. The compressed raw gas enters the raw gas heat exchanger and cools down to 28°C, and passes through the tubular catalyst protector to obtain purified gas; the temperature of the protective agent bed is 28°C, and the active components of the protective agent are copper oxide and zinc oxide. For ceramics; space velocity 1500h -1 , Pressure drop 100KPa.

[0106] W...

Embodiment 3

[0109] The process for producing ethylene by hydrogenation of high-purity acetylene of the present invention is:

[0110] Mix the catalyst diluent perlite particles with a particle size of 100 mesh to 150 mesh and the acetylene hydrogenation catalyst in a mass ratio of 10:1 to form a solid phase material, and then add it to the slurry bed and mix it with the solvent N-methyl pyrrolidone to form a slurry . Acetylene and hydrogen are mixed with the pressure-lifting unit through the compressor at a molar ratio of 1:1 to form a mixed gas. After compression, the pressure of the raw material gas is 0.22MPa, the temperature is 70°C, and the dew point is -46°C. The compressed raw material gas enters the raw material The temperature of the gas heat exchanger is lowered to 30°C, and the purified gas is obtained through the tubular catalyst protector. The active components of the protector are silver oxide and zinc oxide, the carrier is spherical alumina, the bed temperature is 30°C, and...

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Abstract

The invention relates to a system and a method for preparing ethylene through acetylene hydrogenation. The system comprises a mixed pressure increasing unit, a catalyst protection unit, a hydrogenation reaction unit, a cryogenic separation unit, a vacuum filtration unit, a revolving bed generation unit and a vacuum low-pressure distillation unit. The method comprises steps as follows: acetylene and hydrogen are mixed under increased pressure; feed gases obtained after mixing are sequentially introduced into the catalyst protection unit and the hydrogenation reaction unit for a reaction; gaseous products obtained after the reaction are separated, a product ethylene, byproducts and surplus hydrogen are obtained, and the surplus hydrogen is sent to the reaction unit; slurry in a slurry reactor is led out and separated by the vacuum filtration unit, and a solid-phase material and a liquid-phase material are obtained; the solid-phase material is treated by the revolving bed generation unit, and a regenerated catalyst is obtained; the liquid-phase material is treated by the vacuum low-pressure distillation unit, and a solvent is recovered. The system and the method have the advantages as follows: operating flexibility is high, energy consumption of a compressor is low, the service life of the catalyst is long and the adaptive capacity is high.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a system and method for hydrogenating acetylene to produce ethylene. Background technique [0002] Ethylene is a major raw material in the petrochemical industry. The current preparation process is mainly through the cracking of naphtha to produce olefins and coal to olefins. In 2015, the total domestic ethylene production capacity reached about 22 million t / a. In 2020, the domestic ethylene production capacity will further increase to 32.5 million t / a. However, the domestic ethylene consumption is expected to be 48 million tons per year in 2020, and the demand will exceed productivity phenomenon. This poses a serious strategic threat to our country, which is not rich in oil reserves. Therefore, seeking another new source and process to prepare ethylene, which can replace petroleum in the field of industrial production, can largely alleviate my country's d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C5/09
CPCY02P20/584C07C5/09C07C11/04
Inventor 余海鹏史雪君刘周恩吴黎阳程广林吴道洪
Owner SHENWU TECH GRP CO LTD
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