Method for preparing propene by catalytic cracking

A catalytic cracking and propylene technology, applied in chemical instruments and methods, hydrocarbon cracking to produce hydrocarbons, molecular sieve catalysts, etc., can solve the problems of accelerated catalyst aging and long-term unfavorable use
CN102302945AInactive Publication Date: 2012-01-04DALIAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DALIAN UNIV OF TECH
Publication Date
2012-01-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the field of petrochemical industry, and relates to a method for preparing propene by catalytic cracking, which is characterized by comprising the following steps: firstly synthesizing molecular sieve ZSM-5 crystal nuclei, and preparing a silicon source, seed crystals, templating agent and deionized water into a colloidal liquid; preparing an aluminum source, inorganic acid or alkali and deionized water into a solution; while stirring, adding the solution into the colloidal liquid to prepare a uniform gel; carrying out hydrothermal crystallization on the gel, and stopping crystallization before the crystallization induction period finishes; and preparing the molecular sieve ZSM-5 crystal nuclei into a catalytic cracking catalyst which is used for preparing propylene and isobutylene by cracking olefins. The molecular sieve ZSM-5 crystal nuclei catalyst only has a weak acid center; the crystal grains are very tiny and do not need any modification treatment, and hydrogen transfer aromatization and other side reactions can be obviously inhibited without any negative pressure or diluent gas condition, thereby enhancing the selectivity of the target product, simplifying the catalytic cracking technique and lowering the catalyst cost.
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Description

technical field

[0001] The invention belongs to the field of petrochemical industry and relates to a method for producing propylene by catalytic cracking, in particular to a method for preparing a new catalyst and applying the obtained catalyst to produce propylene and isobutene. Background technique

[0002] Liquefied petroleum gas (LPG) is a general term for C3 and C4 hydrocarbons, mainly derived from the by-product gas of crude oil processing, oilfield associated gas, and natural gas field associated gas. More than 95% of LPG produced in my country comes from catalytic cracking gasoline production units, steam cracking production ethylene units, platinum reforming production aromatics units, hydrocracking, coking and other oil refining and processing units. In recent years, with the continuous expansion and new construction of domestic refineries, the output of liquefied gas has continued to increase.

[0003] More than 70% of LPG in China is burned as civil fuel every y...

Claims

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