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

Inactive Publication Date: 2012-01-04
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using water as the diluent is a relatively simple and easy method, but the presence of a large amount of water in the reaction will accelerate the aging of the catalyst, especially the nano-molecular sieve catalyst, which is extremely unfavorable for long-term use

Method used

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  • Method for preparing propene by catalytic cracking
  • Method for preparing propene by catalytic cracking
  • Method for preparing propene by catalytic cracking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] That is, water glass, seed crystal, n-butylamine and deionized water are formulated into glue A, and then aluminum sulfate solution, deionized water and H 2 SO 4 solution, stirred evenly to form solution B, and then slowly added solution B to solution A under strong stirring to form a mixture gel. The molar ratio of each component in the gel according to its oxide is: Al 2 o 3 : SiO 2 :Na 2 O: n-C 4 h 9 NH 2 :H 2 O=1.0:36.2:2.0:12.2:850, the amount of seed crystal added is 10.0% of the total weight of the mixture gel dry basis. The reaction mixture gel was added into the reaction kettle, and the temperature was gradually raised to 110° C. under stirring, and maintained for 24 hours. Then lower it to normal temperature, filter, separate the mother liquor, and wash the reactant with water, dry and roast to obtain a white powder product. As measured by X-ray diffraction (XRD), it has the diffraction characteristic peak of ZSM-5 molecular sieve, but its intensity ...

Embodiment 2

[0116] Repeat Example 1, but change the crystallization temperature to 120°C and 170°C, and the corresponding crystallization time is 18h and 0.5h. Then ZSM-5 crystal nucleus catalysts A-3 and A-4 are obtained. The reaction pressure is normal pressure, the reaction temperature is 470°C, and WHSV=3.5h -1 Under certain conditions, the butene conversion rates were 82.71% and 81.54%, the propylene yields were 27.60% and 26.48%, and the isobutene yields were 12.01% and 14.60%.

Embodiment 3～5

[0118] Repeat Example 1, but change the crystallization time to 20h, 10h, 5h, respectively. Then ZSM-5 crystal nucleus catalysts A-5, A-6 and A-7 were obtained. The butene conversion rates are 69.51%, 65.65% and 66.47%, the propylene yields are 33.40%, 32.60% and 30.26%, and the isobutene yields are 10.45%, 9.75% and 11.03%.

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C07C11/06C07C11/09C07C4/06
CPCY02P20/52
Inventor 郭洪臣张小乐刘春燕常旭生刘家旭梁翠翠
Owner DALIAN UNIV OF TECH
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