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Semi-continuous method for converting methyl alcohol into propylene by using moving bed technology

A methanol conversion and moving bed technology, applied in organic chemistry, chemical recovery, ethylene production, etc., can solve the problems of large transmission power, high energy consumption, poor economic benefits, etc., to increase the reaction system and regeneration device, reaction continuous effect

Inactive Publication Date: 2012-02-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process of continuous reaction regeneration using a continuous reaction-regeneration device and the transfer of the catalyst from the second reaction zone to the first reaction zone require special air stripping between the reaction system and between the reaction system and the regeneration device. The device transports the catalyst flowing out of the reactor to the regeneration device for regeneration, which requires a lot of power for transmission, and has technical defects such as high energy consumption and poor economic benefits

Method used

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  • Semi-continuous method for converting methyl alcohol into propylene by using moving bed technology
  • Semi-continuous method for converting methyl alcohol into propylene by using moving bed technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] 1) The molecular sieve catalyst is mixed with the catalyst diluent and then continuously passed into the first reaction zone. The inlet temperature of the methanol raw material is 240°C. The methanol raw material is passed into the first reaction zone to contact with the molecular sieve catalyst. Under the condition of MPa~0.3MPa, the molecular sieve catalyst stays in the first reaction zone for 30h, and produces the first stream, and the outlet temperature of the first stream is 280°C;

[0069] The first reaction zone is a moving bed reactor;

[0070] 2) The molecular sieve catalyst after passing through the first reaction zone enters the second reaction zone, and the first stream obtained in step 1) is added with utility water vapor and then passed into the second reaction zone to contact with the molecular sieve catalyst, the first stream The molar ratio of stream to water vapor is 1:1, the inlet temperature of the first stream is 450°C, and under the conditions of 4...

Embodiment 2

[0091] 1) The molecular sieve catalyst is mixed with the catalyst diluent and then continuously passed into the first reaction zone. The inlet temperature of the methanol raw material is 260°C. The methanol raw material is passed into the first reaction zone to contact with the molecular sieve catalyst. Under the condition of MPa ~ 0.6MPa, the molecular sieve catalyst stays in the first reaction zone for 50 hours to generate the first stream, and the outlet temperature of the first stream is 300°C;

[0092] The first reaction zone is a moving bed reactor;

[0093]2) The molecular sieve catalyst after passing through the first reaction zone enters the second reaction zone, and the first stream obtained in step 1) is added with utility water vapor and then passed into the second reaction zone to contact with the molecular sieve catalyst, the first stream The molar ratio of stream to water vapor is 4:1, the inlet temperature of the first stream is 470°C, and under the conditions ...

Embodiment 3

[0114] 1) The molecular sieve catalyst is mixed with the catalyst diluent and then continuously passed into the first reaction zone. The inlet temperature of the methanol raw material is 280°C. The methanol raw material is passed into the first reaction zone to contact with the molecular sieve catalyst. Under the condition of MPa~1MPa, the molecular sieve catalyst stays in the first reaction zone for 100h to generate the first stream, and the outlet temperature of the first stream is 320°C;

[0115] The first reaction zone is a moving bed reactor;

[0116] 2) The molecular sieve catalyst after passing through the first reaction zone enters the second reaction zone, and the first stream obtained in step 1) is added with utility water vapor and then passed into the second reaction zone to contact with the molecular sieve catalyst, the first stream The molar ratio of stream to water vapor is 1:4, the inlet temperature of the first stream is 480°C, and under the conditions of 480°...

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Abstract

The invention discloses a semi-continuous method for converting methyl alcohol into propylene by using a moving bed technology, which comprises the following steps: mixing a molecular sieve based catalyst with a diluent, and then, introducing into a first reaction zone; introducing a methyl alcohol raw material into the first reaction zone to generate contact reaction with the molecular sieve based catalyst to generate a first material flow; introducing the first material flow into a second reaction zone to generate the contact reaction with the molecular sieve based catalyst to generate a second material flow; after the second material flow and the methyl alcohol raw material exchange heat and after dehydration and oxide removing are carried out, carrying out separation to obtain a second reaction zone return, a second reaction zone discharge and a third reaction zone feed, and merging the second reaction zone return into the first material flow; introducing the third reaction zone feed into a third reaction zone to be contacted with the molecular sieve based catalyst to generate a third material flow; and conveying the molecular sieve based catalyst into a regenerating unit at regular intervals by adopting a catalyst collector for regeneration, and intermittently merging into the molecular sieve based catalyst for circulation. Three stages of reaction of the methyl alcohol into the propylene are realized only by one molecular sieve based catalyst, thereby, the propylene yield is improved.

Description

technical field [0001] The invention relates to the field of preparing propylene by using the moving bed technology, in particular to a semi-continuous method for converting methanol into propylene by using the moving bed technology. Background technique [0002] Propylene is an important basic chemical raw material in the modern chemical industry, and is currently the second largest chemical in global demand. With the development of industrial economy in various countries in the world, the demand for propylene will increase. The traditional production route of propylene is the catalytic cracking of petroleum raw materials. Due to the limited amount of oil in the world and the rising international crude oil prices, the cost of producing propylene from oil is constantly increasing, which has triggered a research boom in the production of propylene technology (MTP) from relatively cheap methanol. Under the circumstances that the current crude oil price is very high and it is...

Claims

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Application Information

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IPC IPC(8): C07C1/20C07C11/06
CPCY02P20/52Y02P20/584Y02P30/20Y02P30/40
Inventor 阳永荣严丽霞王靖岱蒋斌波黄正梁廖祖维汪燮卿张擎姜坤唐玥琪童国红
Owner ZHEJIANG UNIV
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