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Methanol-to-propylene reaction regeneration system and method

A technology of methanol to propylene and reaction regeneration, which is applied in chemical instruments and methods, catalyst regeneration/reactivation, bulk chemical production, etc., can solve the problem of reducing methanol conversion rate, increasing olefin residence time by reaction order, increasing alkanes and aromatics By-products and other problems, to avoid hydrogen transfer reaction, increase the inlet concentration, reduce the generation of by-products

Active Publication Date: 2016-10-12
上海润和盛建工程科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such a low methanol concentration reduces the methanol conversion rate, and the excessive number of reaction stages increases the residence time of olefins, thereby increasing the formation of by-products such as alkanes and aromatics

Method used

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  • Methanol-to-propylene reaction regeneration system and method
  • Methanol-to-propylene reaction regeneration system and method

Examples

Experimental program
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Effect test

Embodiment 1

[0070] Such as figure 1 As shown, a methanol-to-propylene reaction regeneration device includes an inlet stream switching valve 410, a tubular heat exchanger 300, a heating furnace 200, a single-stage fixed-bed reactor 100, and an outlet Stream switching valve 420 and separation unit 500. The reactor 100 is filled with 50 tons of catalyst, the catalyst is HZSM-5 type molecular sieve particles, and the Si / Al ratio is 200. Methanol raw material 10 flow rate is 200 tons / hour; Recirculating stream is the mixture of water and hydrocarbon, and flow rate is water 252 tons / hour, C 2 and C 4 -C 6 Hydrocarbon 775 tons / hour. After heat exchange and furnace heating, the temperature of reactant stream 14 is 400°C. After the reaction, the temperature of the reactant stream 15 was 480° C., and the conversion rate of methanol was 99%. After separation, the output of propylene 60 is 76.6 tons / hour, which is equivalent to a selectivity of 87.54% for propylene, 3 tons / hour for fuel gas and...

Embodiment 2

[0073] Such as figure 1As shown, a methanol-to-propylene reaction regeneration device includes an inlet stream switching valve 410, a tubular heat exchanger 300, a heating furnace 200, a single-stage fixed-bed reactor 100, and an outlet Stream switching valve 420 and separation unit 500. Reactor 100 is filled with 50 tons of catalyst, which is ZSM-5 high-silicon molecular sieve particles, and the silicon-aluminum ratio is the same as that in Example 1. Methanol raw material 10 flow rate is 100 tons / hour; Recycle flow is the mixture of water and hydrocarbon, and flow rate is water 126 tons / hour, C 2 and C 4 -C 6 Hydrocarbon 387 tons / hour. After heat exchange and furnace heating, the temperature of reactant stream 14 is 400°C. After the reaction, the temperature of the reactant stream 15 was 480° C., and the conversion rate of methanol was 99.9%. After separation, the output of propylene is 35.6 tons / hour, which corresponds to a selectivity of propylene of 81.37%, 3.5 tons...

Embodiment 3

[0076] Such as figure 1 As shown, a methanol-to-propylene reaction regeneration device includes an inlet stream switching valve 410, a tubular heat exchanger 300, a heating furnace 200, a single-stage fixed-bed reactor 100, and an outlet Stream switching valve 420 and separation unit 500. Reactor 100 is filled with 50 tons of catalyst, which is ZSM-5 high-silicon molecular sieve particles, and the silicon-aluminum ratio is the same as that in Example 1. Methanol raw material 10 flow rate is 400 tons / hour; Recycle flow is the mixture of water and hydrocarbon, and flow rate is water 504 tons / hour, C 2 and C 4 -C 6 Hydrocarbon 1548 tons / hour. After heat exchange and furnace heating, the temperature of reactant stream 14 is 400°C. After the reaction, the temperature of the reactant stream 15 was 480° C., and the conversion rate of methanol was 97%. After separation, the output of propylene is 161 tons / hour, which corresponds to a selectivity of 92.0% for propylene, 5.5 tons / ...

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Abstract

The invention relates to a methanol-to-propylene reaction regeneration system and method. The system comprises a reactor, a heating furnace, a heat exchanger, an entrance flow switch valve, an exit flow switch valve and a separation unit, wherein periodical switch between the reaction and regeneration states is realized by controlling the exit flow switch valve; a catalyst is arranged in the reactor; in the reaction process, the reaction materials enter the reactor through a raw material channel and react in the reactor and then are discharged in a form of product through a product channel; and in the regeneration process, the regeneration gas enters the reactor through the raw material channel, the catalyst is regenerated in the reactor, and the regeneration tail gas is discharged from the exit flow switch valve through the product channel. Compared with the prior art, in the invention, propylene is prepared from methanol by a single-section adiabatic fixed-bed reactor, the generation of byproducts is reduced, and the propylene selectivity is remarkably high; and meanwhile, the airspeed of the reactor can be increased, and the dosage of catalyst is reduced.

Description

technical field [0001] The invention relates to a propylene production system and method, in particular to a reaction regeneration system and method for producing propylene from methanol. Background technique [0002] Propylene is an important basic chemical raw material. With the development of industrial economy in various countries, its demand is increasing. At present, the main production method of propylene is naphtha cracking process. However, the global oil reserves are limited and unevenly distributed, and the price fluctuates greatly. Therefore, the development of non-petroleum propylene production technology is of very important strategic significance for China, which is poor in oil and rich in coal. [0003] Methanol catalytic dehydration to propylene technology is one of the most competitive propylene production methods using coal as raw material. German patent DE4009459 (1990) discloses a two-step method for producing propylene from methanol, using ZSM-5 molec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/24C07C11/06B01J38/14B01J29/90
CPCB01J29/90B01J38/14C07C1/24C07C11/06Y02P20/52Y02P20/584
Inventor 黄寻肖文德
Owner 上海润和盛建工程科技有限公司
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