A reaction regeneration system and method for methanol to propylene

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

Active Publication Date: 2018-06-26
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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  • A reaction regeneration system and method for methanol to propylene
  • A reaction regeneration system and method for methanol to propylene

Examples

Experimental program
Comparison scheme
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 present invention relates to a reaction and regeneration system and method for preparing propylene from methanol, the system comprising a reactor, a heating furnace, a heat exchanger, an inlet stream switching valve, an outlet stream switching valve, and a separating unit; switching between reaction and regeneration states is implemented by means of controlling the inlet stream switching valve; the catalyst is internally arranged in the reactor; during the reaction process, a reaction material enters the reactor via a raw material channel, and after reaction inside the reactor, is discharged in the form of a product via a product channel; during the regeneration process, regeneration gas enters the reactor via the raw material channel and regenerates the catalyst in the reactor, the regeneration exhaust gas being discharged from the outlet stream switching valve via the product channel. Compared to the prior art, the present invention uses a single stage adiabatic fixed bed reactor to prepare propylene from methanol, reducing the generation of by-products and having high propylene selectivity; the airspeed of the reactor is also increased, reducing the amount of catalyst used.

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 Patents(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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