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Method for producing propylene ethane by carbon-containing olefin catalytic cracking

A technology of catalytic cracking and propylene ethylene, which is applied in the field of catalytic cracking of carbon-containing olefins to produce propylene and ethylene. It can solve the problems of low independence and combinability of carbon-containing olefin cracking processes, and low added value of carbon-containing olefin mixtures.

Active Publication Date: 2009-07-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the added value of the carbon-containing olefin mixture is not high in the prior art and the independence and combinability of the carbon-containing olefin cracking process are not strong. Methods

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  • Method for producing propylene ethane by carbon-containing olefin catalytic cracking
  • Method for producing propylene ethane by carbon-containing olefin catalytic cracking

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Experimental program
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Effect test

Embodiment 1

[0033] according to figure 1 As shown, the composition (% by weight) of the carbon-containing olefin mixture is: isobutene: 45%, isobutane: 55%. Adopting the technical process of the present invention, the catalyst is a ZSM-5 molecular sieve with a silicon-aluminum ratio of 200, the reactor is a fixed-bed reactor, and the reaction weight hourly space velocity is 15 hours -1 , the reaction temperature is 450°C, the reaction pressure is 0.08MPa, the temperature after partial condenser 5 is 25°C, the cracked product is compressed to 1.5MPa, 28% by weight of C 4 The above cut cycle is used as the cracking raw material, and the pilot plant proves that the product (% by weight) of the following ratio will be obtained:

[0034] Ethylene at a concentration of 90% by weight: 12.3%

[0035] Propylene at 92% by weight: 43.0%

[0036] Non-condensable gas: 0.08%

[0037] 95% propane by weight: 2.2%

[0038] C 4 Above fraction: 424%

Embodiment 2

[0040] according to figure 1 Shown, carbon-containing olefin mixture composition is the same as embodiment 1. Adopt the technological process of the present invention, catalyst is the ZSM-5 molecular sieve of silicon-aluminum ratio 200, and reactor is a fixed-bed reactor, and reaction weight hourly space velocity is 60 hours -1 , the reaction temperature is 500°C, the reaction pressure is 0.15MPa, the temperature after partial condenser 5 is 45°C, the cracked product is compressed to 2.0MPa, 48% by weight of C 4 Above cut cycle will obtain the product (weight %) of following ratio as cracking raw material:

[0041] Ethylene at a concentration of 95% by weight: 12.1%

[0042] Propylene at 96% by weight: 42.2%

[0043] Non-condensable gas: 0.06%

[0044] 92% propane by weight: 5.5%

[0045] C 4 Above fraction: 40.2%

Embodiment 3

[0047] according to figure 1 Shown, carbon-containing olefin mixture composition is the same as embodiment 1. Adopt the technological process of the present invention, the catalyst is the ZSM-5 molecular sieve of silicon aluminum ratio 200, and the reactor is a fixed bed reactor, and the reaction weight hourly space velocity is 100 hours -1 , the reaction temperature is 550 ° C, the reaction pressure is 0.30 MPa, the temperature after the partial condenser 5 is 55 ° C, the cracked product is compressed to 3.5 MPa, 68% by weight of C 4 Above cut cycle will obtain the product (weight %) of following ratio as cracking raw material:

[0048] Ethylene at a concentration of 98% by weight: 13.1%

[0049] Propylene at 99% by weight: 38.6%

[0050] Non-condensable gas: 0.05%

[0051] 82% propane by weight: 3.0%

[0052] C 4 Above fraction: 45.2%

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Abstract

The invention relates to a method for producing propylene and ethylene by catalytic cracking of carbon-containing olefins, which mainly solves the problems in the prior art that the added value of the carbon-containing olefin mixture is not high, and the independence and combinability of the carbon-containing olefin cracking process are not strong. In the present invention, the carbon-containing olefin mixture of the liquid phase raw material is gasified and preheated by heat exchange with the cracked product, and then heated by a heating furnace to reach the reaction temperature; Fractions above C5; the rest of the pyrolysis products are compressed to 1.0-4.0 MPa, sent to the subsequent separation unit for further separation, and the method of obtaining propylene with a weight concentration of 90-99%, ethylene with a weight concentration of 90-99%, and fractions above C4 is better. This problem is solved, and it can be used in industrial devices for producing propylene and ethylene.

Description

technical field [0001] The invention relates to a method for producing propylene and ethylene by catalytic cracking of carbon-containing olefins. Background technique [0002] Propylene and ethylene are important basic organic chemical raw materials. Propylene is mainly used to produce PP, cumene, acrylonitrile, acrylic acid and many other products; ethylene is used to produce polyethylene (PE), polyvinyl chloride (PVC) and ethylene oxide / ethylene glycol (EO / EG), etc. The main raw material of organic chemical products. As important light olefins, the annual demand for propylene and ethylene keeps growing. Thermal cracking of hydrocarbons is still one of the main methods for producing ethylene, while the process for producing propylene can generally be summarized as a by-product process and a proprietary process. The by-product process mainly refers to propylene obtained by steam cracking and catalytic cracking ethylene units. Proprietary technology refers to the technolo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C4/06C07C11/04C07C11/06
Inventor 谢在库杨为民甘永胜滕加伟宗弘元钟思青
Owner CHINA PETROLEUM & CHEM CORP