A process for producing propylene using oxygen-containing compounds as raw materials

A compound and propylene technology, applied in the field of propylene production, can solve the problem of high yield of by-products such as aromatic hydrocarbons and alkanes, and achieve the effects of high propylene selectivity, improved atom utilization, and inhibition of hydrogen transfer reaction

Active Publication Date: 2017-08-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a process for producing propylene using oxygen-containing compounds as raw materials for the problem of high yields of by-products such as aromatics and alkanes in the existing moving bed methanol-to-propylene technology

Method used

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  • A process for producing propylene using oxygen-containing compounds as raw materials
  • A process for producing propylene using oxygen-containing compounds as raw materials
  • A process for producing propylene using oxygen-containing compounds as raw materials

Examples

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Effect test

Embodiment 1

[0041] The process for producing propylene from oxygenates includes the following steps:

[0042] 1) The oxygenate stream 1 containing methanol is continuously fed into the first reaction zone a at 400 °C, 1 MPaG, and the mass space velocity of methanol is 1 h -1 The etherification reaction occurs in contact with the catalyst under certain conditions, and the reaction generates an oxygen-containing compound stream 2, and the first reaction zone a includes a fixed-bed reactor filled with an alumina catalyst;

[0043] 2) The oxygenate stream 2 at the outlet of the first reaction zone a is mixed with the diluent 3 and the stream 4 is passed into the second reaction zone b at 450 °C, 0.1 MPaG, oxygenate partial pressure 5 kPa, mass space velocity 0.5 h -1 Under certain conditions, it contacts with the molecular sieve catalyst to produce olefins, and generates a mixed hydrocarbon stream 5 including the target product propylene. The second reaction zone b comprises a moving bed rea...

Embodiment 2

[0050] The process for producing propylene from oxygenates includes the following steps:

[0051] 1) The oxygenate stream 1 containing dimethyl ether is continuously fed into the first reaction zone a at 200 ℃, 0.1MPaG, and the oxygenate mass space velocity is 20 h -1 The etherification reaction occurs in contact with the catalyst under certain conditions, and the reaction generates an oxygen-containing compound stream 2, and the first reaction zone a includes a moving bed reactor filled with a molecular sieve catalyst;

[0052] 2) Mix the oxygenate stream 2 from the outlet of the first reaction zone a and the stream 4 of the diluent 3 into the second reaction zone b at 550 °C, 1 MPaG, oxygenate partial pressure 50 kPa, mass space velocity 10.0 h -1 Under certain conditions, it contacts with the molecular sieve catalyst to produce olefins, and generates a mixed hydrocarbon stream 5 including the target product propylene. The second reaction zone b comprises two moving bed react...

Embodiment 3

[0059] The process for producing propylene from oxygenates includes the following steps:

[0060] 1) The oxygenate stream 1 containing methanol and dimethyl ether is continuously fed into the first reaction zone a at 250 °C, 0.5 MPaG, and the oxygenate mass space velocity is 10 h -1 The etherification reaction occurs in contact with the catalyst under certain conditions, and the reaction generates an oxygen-containing compound stream 2. The first reaction zone a includes two moving bed reactors arranged in series and filled with molecular sieve catalysts;

[0061] 2) The oxygenate stream 2 at the outlet of the first reaction zone a is mixed with the diluent 3 and the stream 4 is passed into the second reaction zone b at 500 °C, 0.3 MPaG, oxygenate partial pressure 15 kPa, mass space velocity 5.0 h -1 Under certain conditions, it contacts with the molecular sieve catalyst to produce olefins, and generates a mixed hydrocarbon stream 5 including the target product propylene. The...

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PUM

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Abstract

The invention discloses a process for producing propylene by taking oxygenated compounds as raw materials. The process comprises the steps of converting methanol in the oxygenated compounds into dimethyl ether to the maximum extent, then, carrying out contact reaction on dimethyl ether and a molecular sieve based catalyst under a high-severity condition, and next, delivering the reaction product into a separation system; introducing residual components except for propylene to a hydrocarbon conversion reaction region to further generate propylene; and returning non-propylene parts as circular logistics to the hydrocarbon conversion reaction region to carry out circular reaction, wherein the catalyst used in the hydrocarbon conversion reaction region is from a carbon deposition agent obtained after catalyzing the oxygenated compounds to react under the high-severity condition. By using the process, the yield of propylene can be effectively increased, the flow of the circular logistics can be reduced, the energy consumption of the process can be reduced, and the total life of the catalyst can be favorably prolonged; and the process can be used in industrial production of propylene prepared from methanol.

Description

technical field [0001] The invention relates to a process for preparing low-carbon olefins, in particular to a process for producing propylene with oxygen-containing compounds as raw materials. Background technique [0002] Low-carbon hydrocarbons such as ethylene and propylene are the foundation of the modern chemical industry, and the demand for propylene has the highest growth rate. At present, the production methods of propylene mainly include olefin disproportionation, steam cracking and FCC unit modification, C 4 / C 5 Selective cracking of hydrocarbons, propane dehydrogenation and methanol to olefins, etc. Among them, steam cracking, FCC and propane dehydrogenation technologies are relatively mature, methanol to olefins (MTO) technology, olefin disproportionation technology, C 4 / C 5 The selective cracking technology of hydrocarbons has also been industrialized, but there is still a lot of room for technological breakthroughs. In today's increasingly tense situatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/06C07C1/20
CPCY02P20/52Y02P20/584Y02P30/20Y02P30/40
Inventor 蒋斌波蒋云涛周冰洁阳永荣王靖岱廖祖维黄正梁
Owner ZHEJIANG UNIV
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