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A kind of molecular sieve catalyst for the catalytic cracking of MTP by-product hydrocarbons and its preparation method

A technology of molecular sieves and catalysts, which is applied in the field of molecular sieve catalysts and their preparation, can solve problems such as separation difficulties, thermal stability and hydrothermal stability reduction of nano-molecular sieves, and achieve rich structural features, good catalytic cracking effect, and reduction of side effects such as aromatics. The effect of product formation

Active Publication Date: 2019-07-23
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nano-ZSM-5 molecular sieves are easy to aggregate and difficult to separate, and the thermal stability and hydrothermal stability of nano-molecular sieves will be greatly reduced.

Method used

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  • A kind of molecular sieve catalyst for the catalytic cracking of MTP by-product hydrocarbons and its preparation method
  • A kind of molecular sieve catalyst for the catalytic cracking of MTP by-product hydrocarbons and its preparation method
  • A kind of molecular sieve catalyst for the catalytic cracking of MTP by-product hydrocarbons and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-16

[0080] II. The hydrocarbon cracking catalytic performance evaluation of the modified ZSM-5 molecular sieve catalyst obtained in embodiment 1-16

[0081] The properties of the modified ZSM-5 molecular sieve catalysts obtained in Examples 1-16 were investigated by catalytic cracking of the model compound n-hexane. The catalytic cracking reaction was evaluated in a continuous small fixed-bed reactor. The reaction tube is a φ10mm×430mm quartz tube, the catalyst loading is 0.5-2.0g, the reaction temperature is 550-650°C, and the space velocity is 1-3.0h -1 , the system pressure is normal pressure. The SP-3420 gas chromatograph was used for on-line analysis, and the organic composition in the product was detected by a hydrogen flame ionization detector, and a small amount of dry gas generated during the reaction was ignored. Before the reaction starts, the catalyst is firstly activated under the condition that N 2 The molecular sieve bed was purged for 1 h at a flow rate of 50 L / ...

Embodiment 17

[0084] At normal pressure, the temperature is 625°C, the catalyst loading is 2.0g, and the space velocity is 3h -1 Under the condition, examine different TPXA among the embodiment 1-4 + The catalytic cracking performance of ZSM-5 molecular sieve synthesized by the added amount on n-hexane, and the evaluation results are shown in Table 5.

Embodiment 18

[0086] At normal pressure, the temperature is 625°C, the catalyst loading is 2.0g, and the space velocity is 3h -1 Under certain conditions, the catalytic cracking performance of ZSM-5 molecular sieves with different silicon-aluminum ratios in Examples 5-8 on MTP by-product hydrocarbons was investigated, and the evaluation results are shown in Table 6.

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Abstract

The invention provides a molecular sieve catalyst used for the catalytic cracking of MTP by-product hydrocarbons and a preparation method thereof. In particular, it relates to a preparation method of a modified ZSM-5 molecular sieve catalyst, which includes the steps of: a. combining a silicon source, an aluminum source, Organic template, alkali and deionized water are prepared to synthesize silica-alumina gel, and then hydrothermal crystallization is performed in a closed reaction vessel to prepare a modified ZSM-5 molecular sieve precursor; b. Add organosilane ammonium salt to the obtained precursor. aqueous solution of TPXA+ and mix evenly; c. Adjust the pH of the system obtained in step b to 10-12 and continue crystallization at 150-180°C; d. Exchange and roast the product obtained in step c to obtain the final product. The catalyst of the invention is used for catalytic cracking of MTP by-product hydrocarbons and has the advantages of high selectivity to low-carbon olefins and long service life.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a molecular sieve catalyst used for catalytic cracking of MTP by-product hydrocarbons and a preparation method thereof. Background technique [0002] With the development of the global economy, the demand for low-carbon olefins is increasing, and oil resources are increasingly scarce. The recent implementation of the coal-based methanol-to-olefins (MTP) project can effectively alleviate the shortage of naphtha and low-carbon oil in my country. The degree of dependence of olefins on the international market. MTP technology uses coal as raw material to produce propylene through dehydration of methanol and dimethyl ether. It is currently the most mature and economical production technology to replace petroleum route to produce propylene. The by-products are gasoline, liquefied gas and a small amount of ethylene and other hydrocarbons. compound. [0003] As a new chemi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40C07C4/06C07C11/04C07C11/06C07C11/08
CPCC07C4/06B01J29/041B01J29/40C07C2529/40B01J2229/32B01J35/60C07C11/04C07C11/06C07C11/08Y02P20/52
Inventor 巩雁军
Owner CHNA ENERGY INVESTMENT CORP LTD
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