Method and system for preparing propylene by using methanol

A technology for propylene and methanol, which is applied in chemical instruments and methods, ethylene production, hydrocarbon cracking and hydrocarbon production, etc. It can solve the problems of easy coking and deactivation of the catalyst, high energy consumption of the device, and low propylene yield, so as to reduce the cost of the catalyst, The effect of reducing complexity and increasing yield

Active Publication Date: 2014-02-05
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above deficiencies in the prior art, the present invention provides a method and system for producing propylene from methanol to solve the problem of low propylene yield, easy coking and deactivation of the catalyst, cumbersome regeneration, and high energy consumption of the device in the existing methanol-to-propylene technology. The problem

Method used

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  • Method and system for preparing propylene by using methanol
  • Method and system for preparing propylene by using methanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The first fixed bed reactor: the feed space velocity of raw material methanol is 1h -1 , the reaction bed temperature is 365~380℃, the reaction pressure is 1.1~1.2MPa, and the catalyst is γ-Al 2 o 3 (Südchem Catalyst Works, DME-1 type catalyst) to obtain a first product stream.

[0067] The first moving bed reactor: the feed is a mixture of the first product stream and water vapor as a reactant diluent, and the feed space velocity of the first product stream is 1h -1 , and its mass ratio to water vapor is 1:1. The reaction temperature is 520-530° C., the reaction pressure is 0.2-0.25 MPa, and the catalyst is ZSM-5 molecular sieve catalyst (MTPROP-1 catalyst from the Southern Chemical Catalyst Factory in Germany) to obtain the second product stream.

[0068] Second moving bed reactor: Feed is propylene-free C from the separation unit 2 ~C 4 hydrocarbon mixture. The reaction temperature is 120-130° C., the reaction pressure is 0.6-0.7 MPa, and the catalyst is ZSM-5 ...

Embodiment 2

[0072] The first fixed bed reactor: the feed space velocity of raw material methanol is 1h -1 , the reaction temperature is 365-380°C, the reaction pressure is 1.1-1.2MPa, and the catalyst is γ-Al 2 o 3 (Südchem Catalyst Works, DME-1 type catalyst) to obtain a first product stream.

[0073] The first moving bed reactor: the feed is a mixture of the first product stream and water vapor as a reactant diluent, and the feed space velocity of the first product stream is 1h -1 , and its mass ratio to water vapor is 1:1. The reaction temperature is 520-530° C., the reaction pressure is 0.2-0.25 MPa, and the catalyst is ZSM-5 molecular sieve catalyst (MTPROP-1 catalyst from the Southern Chemical Catalyst Factory in Germany) to obtain the second product stream.

[0074] Second moving bed reactor: Feed is propylene-free C from the separation unit 2 ~C 4 hydrocarbon mixture. The reaction temperature is 120-130°C, the reaction pressure is 0.6-0.7MPa, and the catalyst is Mo / Al from F...

Embodiment 3

[0078] The first fixed bed reactor: the feed space velocity of raw material methanol is 1h -1 , the reaction temperature is 290-300°C, the reaction pressure is 1.5-1.6MPa, and the catalyst is γ-Al 2 o 3 (Südchem Catalyst Works, DME-1 type catalyst) to obtain a first product stream.

[0079] The first moving bed reactor: the feed is a mixture of the first product stream and water vapor as a reactant diluent, and the feed space velocity of the first product stream is 1h -1 , and its mass ratio to water vapor is 1:1. The reaction temperature is 460-470°C, the reaction pressure is 0.06-0.07MPa, and the catalyst is ZSM-5 molecular sieve catalyst (MTPROP-1 catalyst, Südchem Catalyst Factory, Germany) to obtain the second product stream.

[0080] Second moving bed reactor: Feed is propylene-free C from the separation unit 2 ~C 4 hydrocarbon mixture. The reaction temperature is 80-90°C, the reaction pressure is 1.2-1.3MPa, and the catalyst is Mo / Al from Fushun Kerui Catalyst Co....

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Abstract

The invention discloses a method for preparing propylene by using methanol. The method comprises the steps of: feeding methanol into a first fixed bed reactor to obtain a first product flow; mixing the first product flow with a reactant diluting agent and feeding the mixture in a first moving bed reactor to obtain a second product flow; feeding a C2-C4 hydrocarbon mixture without propylene, which is from a separating device, into a second moving bed reactor to obtain a third product flow; feeding a C5+ hydrocarbon mixture, which is from the separating device, into a second fixed bed reactor to obtain a fourth product flow, wherein the separating device is used for separating the second, third and fourth product flows so as to separate out products: propylene, the C2-C4 hydrocarbon mixture without propylene, and the C5+ hydrocarbon mixture. The invention further discloses a system for preparing propylene by utilizing the method, and the problems in the existing technology for preparing propylene by using methanol that propylene yield is low, a catalyst is likely to coke and deactivate and is complicated to regenerate, and the energy consumption of devices is high can be solved.

Description

technical field [0001] The present invention relates to a method and system for producing propylene from methanol. Background technique [0002] Ethylene and propylene are important petrochemical basic raw materials, and the annual demand is huge. In particular, propylene is currently the second largest chemical in the world, and its consumption has increased significantly, even surpassing ethylene. So far, propylene still mainly comes from the light oil cracking / cracking process in petroleum processing, and is obtained as co-products or by-products. are greatly restricted. In view of my country's energy structure rich in coal, poor in oil, and low in gas, the catalytic conversion of methanol to propylene technology has good application prospects and far-reaching strategic significance. [0003] At present, there are many reports on the process of producing low-carbon olefins from methanol, mainly including the methanol-to-propylene technology (MTP) of Lurgi Company in Ger...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06C07C1/20C07C4/06C07C6/00
CPCY02P20/584Y02P30/20Y02P30/40
Inventor 王林张堃雍晓静王峰罗春桃
Owner CHNA ENERGY INVESTMENT CORP LTD
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