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Method for improving selectivity of ethylene propylene

An ethylene-propylene, selective technology, applied in ethylene production, chemical instruments and methods, molecular sieve catalysts, etc., can solve difficult problems such as uniform distribution of raw materials, complex contact conduit structure, etc.

Active Publication Date: 2008-10-08
SHANGHAI RES INST OF PETROCHEMICAL TECH SINOPEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure of the contact conduit is complex, and it is difficult to solve the problem of uniform distribution of raw materials in the reactor during the scale-up process of the reactor.

Method used

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  • Method for improving selectivity of ethylene propylene
  • Method for improving selectivity of ethylene propylene
  • Method for improving selectivity of ethylene propylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 200,000 tons / year of methanol to produce low-carbon olefins figure 1 The fluidized bed reactor shown. The diameter of the reactor is 3100 mm, the distribution plate is covered with insulating material high alumina bricks, the thickness is 200 mm, the pressure is 0.06 MPaG, the reaction temperature is 470 ° C, and the space velocity is 6.0 hours -1 , the perforation speed is 186.8 m / s, the speed of the side slot is 8.5 m / s, the SAPO-34 molecular sieve catalyst is used, the reaction raw material is pure methanol, the temperature of the raw material before contacting the catalyst is 150 ° C, the selectivity of ethylene + propylene 82.18%.

Embodiment 2

[0019] 300,000 tons / year of methanol production of low-carbon olefins figure 1 The fluidized bed reactor shown. The diameter of the reactor is 3900 mm, the distribution plate is covered with insulating material high-temperature calcium silicate, the thickness is 110 mm, the pressure is 0.06 MPaG, the reaction temperature is 450 ° C, and the space velocity is 0.5 hours -1 , the perforation speed is 142.1 m / s, the speed of the side slot is 12.0 m / s, the SAPO-34 molecular sieve catalyst is used, the reaction raw material is pure methanol, the temperature of the raw material before contacting the catalyst is 200 ° C, the selectivity of ethylene + propylene 81.55%.

Embodiment 3

[0021] 300,000 tons / year of methanol production of low-carbon olefins figure 1 The fluidized bed reactor shown. The diameter of the reactor is 3900 mm, the distribution plate is covered with insulating material silicon oxide-alumina ceramics, the thickness is 160 mm, the pressure is 0.06 MPaG, the reaction temperature is 500 ° C, and the space velocity is 3.0 hours -1 , the perforation speed is 101.5 m / s, the speed of the side slot is 22.8 m / s, the SAPO-34 molecular sieve catalyst is used, the reaction raw material is pure methanol, the temperature of the raw material before contacting the catalyst is 160 ° C, the selectivity of ethylene + propylene 81.87%.

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Abstract

The invention relates to a method for improving the selectivity of ethylene propylene, which mainly solves the problems that the temperature is rather high before a methanol enters a reactor to contact with a catalyst in the process of low carbon olefin production by methanol, then partial methanol is decomposed to produce a by-product, and the selectivity of the low carbon olefin is reduced. The invention well solves the problems by adopting the technical proposal that an insulating material (3) is covered at the lower part of a gas distribution plate (2) of a fluidized bed reactor (1) to maintain the temperature under 200 DEG C before the raw material contacts with the catalyst, and the method can be used for the industrial production of producing the low carbon olefin by methanol.

Description

technical field [0001] The present invention relates to a method for increasing the selectivity of ethylene and propylene. Specifically, it relates to a method for improving the selectivity of ethylene propylene by reducing methanol decomposition into by-products in the process of producing ethylene propylene from methanol. Background technique [0002] Petrochemical industry is an important pillar industry in the national economy. It provides a large amount of chemical raw materials for industry, agriculture, transportation and national defense. It is one of the most relevant and leading industrial sectors in the national economy. Ethylene and propylene are the two most important basic raw materials for modern petrochemical industry. [0003] For a long time, coal or natural gas-to-synthesis gas, syngas-to-methanol and olefin separation technologies have had large-scale and mature experience, but the process from methanol to olefins is a breakpoint and difficulty in the in...

Claims

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Application Information

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IPC IPC(8): C07C1/20C07C11/02B01J29/85
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 谢在库钟思青张惠明刘俊涛
Owner SHANGHAI RES INST OF PETROCHEMICAL TECH SINOPEC
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