Alkene co-cracking catalyst and alkene mixed catalytic cracking method

A catalyst and co-cracking technology, used in catalytic cracking, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of catalyst loss, high coking amount, low total conversion rate and low propylene selectivity yield, etc., and achieve low wear and coking. Low volume, the effect of increasing the overall conversion rate

Active Publication Date: 2021-02-05
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is firstly to provide an alkene co-cracking catalyst and

Method used

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  • Alkene co-cracking catalyst and alkene mixed catalytic cracking method
  • Alkene co-cracking catalyst and alkene mixed catalytic cracking method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0058]Example 1

[0059](1) Preparation of ZSM-5

[0060]First, the ethyl orthosilicate, sodium aluminate, tetrapropylammonium hydroxide, ammonia and water are2:1Al2O3:20TPABr:120NH3·H2O:2000H2The molar ratio of O is mixed, and then crystallized at 80°C for 12h, and then at 180°C for 48h to obtain ZSM-5 with a grain size of 500-3000nm and a silicon-to-aluminum molar ratio of 100. Then wash and pump It is filtered and dried at 120°C for 12 hours, and then calcined at 600°C for 10 hours to obtain molecular sieve material ZSM-5.

[0061](2) Alkali treatment of catalyst carrier

[0062]Mix the above-mentioned molecular sieve material ZSM-5 with 0.4mol / L NaOH solution in a mass ratio of 1:6, then exchange at 90℃ for 2h, then wash it to neutrality, and then dry it at 120℃ for 12h, Baking at 540℃ for 2h.

[0063]Mix ZSM-5 molecular sieve with 1mol / L ammonium nitrate solution in a mass ratio of 1:10, then carry out ammonium exchange at 90°C for 4h, then wash it to neutrality, and then dry it at 120°C for ...

Example Embodiment

[0078]Example 2

[0079]The catalyst was prepared according to the same process as in Example 1, except that the supported non-metal elements were different.

[0080]The steps of non-metallic element impregnation modification are:

[0081](3) Combine boric acid and (NH4)2SO4The solution is mixed to prepare the dipping liquid. According to the mass ratio of the dipping liquid to HZSM-5 of 0.5:1, the HZSM-5 is impregnated with B and S to obtain a loading of 0.5wt% of B and 0.8wt of S %. Then, they were aged for 6 hours at room temperature, dried at 120°C for 12 hours, and baked at 540°C for 4 hours.

[0082]The rest of the operation is the same as in Example 1.

[0083]The catalytic effect evaluation experiment of the catalyst is the same as that of Example 1, and the results are shown in Table 2.

Example Embodiment

[0084]Example 3

[0085]The catalyst was prepared according to the same process as in Example 1, except that the supported metal elements were different, and the conditions for impregnation and modification of the metal elements were different.

[0086]The specific operation of HZSM-5 for metal element impregnation modification is:

[0087](5.1) Impregnation of Mo on HZSM-5 that has been hydrothermally treated

[0088]First dissolve ammonium molybdate in a dilute ammonia solution with pH=8.5, heat to 90°C to dissolve it, and then immerse Mo on the hydrothermally aged HZSM-5 at room temperature at a mass ratio of 0.4:1 The loading amount of Mo is 0.2wt%, and then it is aged at room temperature for 6 hours, dried at 120°C for 12 hours, and baked at 540°C for 4 hours.

[0089](5.2) Impregnation of Mn, Ca and La on HZSM-5 loaded with Nb

[0090]MnCl2, CaCl2And La(NO3)3After mixing the citric acid solution with HZSM-5 at a mass ratio of 0.3:1, impregnate Mn, Ca and La on the Mo-loaded HZSM-5 to obtain a l...

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Abstract

The invention provides an alkene co-cracking catalyst and an alkene mixed catalytic cracking method. The catalyst disclosed by the invention is obtained by carrying out hydrothermal aging treatment on20-50 wt% of a modified molecular sieve, 1-50 wt% of a matrix, 3-35 wt% of a binder and 3-15 wt% of a composite additive at the temperature of 500-800 DEG C, the modified molecular sieve is obtainedby sequentially performing alkali treatment, impregnation modification of at least two non-metallic elements, hydro-thermal treatment and impregnation modification of at least three metallic elementson a molecular sieve; and the composite additive at least comprises inorganic acid and cellulose. The alkene co-cracking catalyst provided by the invention has different types of acid centers such assuper acid, strong acid and weak acid, so that an alkene mixed raw material can be catalytically cracked, a relatively high conversion rate can be achieved and can reach 50% or above, the propylene yield is not lower than 20%, the coking amount is lower than 3%, and the catalyst loss within 4 hours is lower than 0.5%.

Description

technical field [0001] The invention relates to petrochemical technology, in particular to an alkene co-cracking catalyst and a catalytic cracking method for alkene mixed feed. Background technique [0002] Propylene is an important petrochemical basic raw material, mainly used in the production of polypropylene, acrylonitrile, isopropanol, acetone and propylene oxide, etc. Other uses include alkylation oil, catalytic lamination and dimerization, high octane Alkane gasoline blending materials, etc. In recent years, driven by the rapid growth in demand for downstream derivatives, global propylene consumption has increased significantly. At this stage, propylene is mainly derived from the by-products of ethylene, gasoline and diesel production processes. However, due to the increasingly saturated gasoline and diesel markets, the production of propylene is also severely restricted, and a stable supply cannot be guaranteed. [0003] The development of new low-carbon olefins pr...

Claims

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Application Information

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IPC IPC(8): C10G11/06B01J29/48
CPCC10G11/06B01J29/48C10G2400/20
Inventor 赵亮曹丽媛孙海玲高金森张宇豪徐春明刘梦绮
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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