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Method for utilizing circulating fluidized bed to prepare propylene and C4 hydrocarbons from methanol

A circulating fluidized bed and methanol preparation technology, which is applied in the field of chemical catalysis, can solve the problems of easy coking and deactivation of the catalyst, slow heat dissipation of the fixed bed, etc., and achieve the effects of good economy, wide operating conditions and increased space velocity

Inactive Publication Date: 2014-10-15
SHANGHAI BI KE CLEAN ENERGY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, methanol to olefins is a strong exothermic reaction. If a fixed-bed reactor is used, in the laboratory stage, because the catalyst loading is relatively small and the water-to-alcohol ratio is high, excess heat can be removed by water, and in industrial scale-up Finally, due to the slow heat dissipation of the fixed bed, the catalyst is easily coked and deactivated due to the high bed temperature

Method used

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  • Method for utilizing circulating fluidized bed to prepare propylene and C4 hydrocarbons from methanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The 120Kg catalyst prepared according to No. 201310040880.0 Chinese patent application (using ZSM-5 molecular sieve with a silicon-aluminum ratio of 200 as the active ingredient, the mass content of ZSM-5 molecular sieve in the catalyst is 50%, and the average particle size of catalyst microspheres is 85 μm) is loaded In a circulating fluidized bed reactor with a reactor inner diameter of 263mm and a height of 1288mm, the raw material methanol is gasified at a gasification temperature of 300°C, then passed into the fluidized bed reactor, and reacted under the action of the above catalyst, The mass space velocity of methanol is 4h -1 , the linear velocity of which enters the reactor is 0.3m / s, the temperature of the reactor is 500°C, and the pressure is 0.09MPa.

[0055] The reaction product from the fluidized bed reactor enters the separation system mainly composed of water washing tower, alkali washing tower, deethanizer and other rectification towers, and C1, C2, and ...

Embodiment 2

[0059]150kg of catalyst prepared according to Chinese patent application No. 201310040880.0 (ZSM-5 molecular sieve with a silicon-aluminum ratio of 200 as the active ingredient, the mass content of ZSM-5 molecular sieve in the catalyst is 20%, and the average particle size of the catalyst microspheres is 60 μm) is loaded In a circulating fluidized bed reactor with an inner diameter of 263mm and a height of 1288mm, the raw material methanol aqueous solution (alcohol-water ratio is 10) is gasified at a gasification temperature of 300°C, and then passed into the fluidized bed reactor In the reaction under the action of the above catalyst, the mass space velocity of methanol is 3h -1 , the linear velocity of which enters the reactor is 0.1m / s, the temperature of the reactor is 450°C, and the pressure is 0.15MPa.

[0060] The reaction product from the fluidized bed reactor enters the separation system mainly composed of water washing tower, alkali washing tower, deethanizer and oth...

Embodiment 3

[0064] 150 kg of the above-mentioned catalyst prepared according to the Chinese patent application No. 201310040880.0 (with the ZSM-5 molecular sieve having a silicon-aluminum ratio of 200 as the active ingredient, the mass content of the ZSM-5 molecular sieve in the catalyst being 80%, and the average particle diameter of the catalyst microspheres being 100 μm) Fill it into a circulating fluidized bed reactor with an inner diameter of 263mm and a height of 1288mm. After gasifying the raw methanol aqueous solution (alcohol-water ratio: 5) at a gasification temperature of 300°C, it is passed into the fluidized bed for reaction. In the reactor, react under the action of the above catalyst, wherein the mass space velocity of methanol is 8h -1 , the linear velocity of which enters the reactor is 1m / s, the temperature of the reactor is 490°C, and the pressure is 0.1MPa.

[0065] The reaction product from the fluidized bed reactor enters the separation system mainly composed of wate...

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Abstract

The invention provides a method for utilizing a circulating fluidized bed to prepare propylene and C4 hydrocarbons from methanol. The method comprises the following steps: 1) enabling a raw material containing methanol to enter a fluidized bed reactor, so as to generate a reaction product flow containing C1 hydrocarbon, C2 hydrocarbons, propylene, by-products, C4 hydrocarbons, C5 hydrocarbons, C6 hydrocarbons and hydrocarbons with more than six carbon atoms under the effect of a catalyst; and 2) enabling the reaction product flow obtained in the step 1) to enter a separation system to perform separation, so as to separate C1, C2 and C5 hydrocarbons, propylene, C4 hydrocarbons, C6 hydrocarbons, hydrocarbons with more than six carbon atoms and by products, returning C1, C2 and C5 hydrocarbons to the reactor to perform reaction, and recovering propylene, C4 hydrocarbons, C6 hydrocarbons, hydrocarbons with more than six carbon atoms and by-products as final products.

Description

technical field [0001] The invention relates to the field of chemical catalysis, in particular to a method for preparing propylene and C4 hydrocarbons from methanol using a circulating fluidized bed. Background technique [0002] Propylene and butadiene are important chemical raw materials, which are generally obtained from naphtha cracking and steam cracking. At present, the main source of propylene is ethylene co-production of propylene and refinery by-product propylene, while the main source of butadiene is obtained by further processing the C4 by-products produced by the ethylene cracking process, but these production methods are difficult to meet the growing demand in my country. With the demand for propylene and butadiene, it is highly desirable to develop a process that can produce propylene and C4 olefins with high selectivity. [0003] Lurgi Corporation of Germany has developed a technology for preparing olefins from methanol using a fixed bed (WO2004 / 018089). This...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06C07C1/20
CPCC07C2529/40C07C1/20C07C11/06C10G11/05B01J29/40Y02P20/52
Inventor 王义君张帆芮果甘永胜张小莽
Owner SHANGHAI BI KE CLEAN ENERGY TECH
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