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H-ZSM-5 zeolite catalyst for preparing propylene from methanol and application thereof

A methanol preparation and molecular sieve technology, which is applied in molecular sieve catalysts, physical/chemical process catalysts, organic chemistry, etc., can solve the problems of low propylene yield, low P/E ratio, low synthesis yield, etc., and improve the propylene yield. , The effect of reducing displacement and small grain size

Inactive Publication Date: 2011-07-20
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a kind of small-grain ZSM-5 molecular sieve catalyst of high selectivity and stability prepared by hydrothermal synthesis technology, to solve existing ZSM-5 molecular sieve synthetic yield low and the propylene yield existing in MTP technology Problems with Low and Low P / E Ratio

Method used

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  • H-ZSM-5 zeolite catalyst for preparing propylene from methanol and application thereof
  • H-ZSM-5 zeolite catalyst for preparing propylene from methanol and application thereof
  • H-ZSM-5 zeolite catalyst for preparing propylene from methanol and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Tetraethyl orthosilicate, aluminum meta-acid, tetrapropylammonium hydroxide, and deionized water are prepared into a gel mixture, and the weight ratio is: 98.4:0.24:0.12:1.24. The prepared mixture was heated to 70°C under normal pressure, kept at constant temperature for 10 hours, and then moved into a crystallization tank. Raise the temperature to 170°C and crystallize for 72 hours. Crystallization was then stopped by rapid cooling with ice water, and the mixture was removed from the kettle. The above mixture was washed with deionized water until the filter cake pH=9. Dry at 110°C for 12 hours, and bake at 540°C for 3 hours in an air atmosphere. At 90°C, exchange with 0.5 mol / L HCl solution twice for 2 hours each time. Washing, drying and calcining at 540° C. for 4 hours to obtain H-ZSM-5 molecular sieve. The crystal phase was analyzed by X powder ray diffractometer (Rigaku D / max-ra type ray diffractometer), tube voltage 40Kv, tube current 30mA, CuKα radiation, Ni ...

Embodiment 2

[0036] Silicic acid, aluminum sulfate, tetrapropylammonium hydroxide, and deionized water are prepared into a gel mixture, and the weight ratio is: 90.3:3.95:1.18:4.57. The prepared mixture was heated to 70°C under normal pressure, kept at constant temperature for 7 hours, and then moved into a crystallization kettle. Raise the temperature to 170°C and crystallize for 96 hours. Crystallization was then stopped by rapid cooling with ice water, and the mixture was removed from the kettle. The above mixture was washed with deionized water until the filter cake pH=9. Dry at 110°C for 12 hours, and bake at 540°C for 4 hours in an air atmosphere. At 90°C, exchange 2 times with 1mol / L HNO3 solution for 2 hours each time. Washing, drying and calcining at 500° C. for 5 hours to obtain H-ZSM-5 molecular sieve. X powder ray diffractometer analysis results show that the synthesized crystal is ZSM-5 molecular sieve.

[0037] The catalyst evaluation method is the same as in Example 1, ...

Embodiment 3

[0039] White carbon black, aluminum nitrate, tetrapropylammonium bromide, sodium hydroxide, and deionized water are prepared into a gel mixture, and the weight ratio is: 88.2:6.9:1.2:0.1:3.6. The prepared mixture was heated to 70°C under normal pressure, kept at constant temperature for 7 hours, and then moved into a crystallization kettle. Raise the temperature to 170°C and crystallize for 48 hours. Crystallization was then stopped by rapid cooling with ice water, and the mixture was removed from the kettle. The above mixture was washed with deionized water until the filter cake pH=8. Dry at 110°C for 12 hours, and bake at 540°C for 4 hours in an air atmosphere. At 90°C, exchange with 1 mol / L HCl solution twice for 2 hours each time. Washing, drying and calcining at 500° C. for 5 hours to obtain H-ZSM-5 molecular sieve. X powder ray diffractometer analysis results show that the synthesized crystal is ZSM-5 molecular sieve.

[0040] The catalyst evaluation method is the s...

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Abstract

The invention provides an H-ZSM-5 zeolite catalyst for preparing propylene from methanol and an application thereof. An H-ZSM-5 zeolite with small crystal grains obtained by directional preparation through the hydrothermal synthesis technology has small crystal grain size and high specific surface area, and can achieve the purpose of shortening the length of a diffusion path of molecules of a product, improving the diffusion performance of the catalyst and reducing the secondary reaction of a low-carbon olefin product. The H-ZSM-5 zeolite catalyst is used in the reaction for preparing the propylene from the methanol, the yield of the propylene and the P / E (propylene / ethylene) weight ratio are greatly improved, and the P / E weight ratio is above 8.

Description

technical field [0001] The invention relates to a molecular sieve catalyst for preparing propylene from methanol, in particular to a small-grain ZSM-5 molecular sieve catalyst synthesized directionally in a very concentrated system and its use in methanol conversion to prepare propylene. Background technique [0002] Propylene is one of the most important basic organic raw materials next to ethylene. With the year-by-year expansion of the application field of its derivatives, the demand is increasing day by day, but the lack of petroleum resources makes it urgent to develop a non-petroleum-based propylene preparation process. Propane dehydrogenation to propylene technology and ethylene and butene disproportionation to propylene technology can produce propylene with high selectivity, but the former uses propane-rich natural gas as a raw material, which is limited geographically, and the latter needs to consume ethylene resources, which are not in line with my country's energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C07C11/06C07C1/20
CPCY02P20/52
Inventor 王俭姚敏崔洪明艾宇廉焦洪桥刘万州张堃宋岩窦涛吉向飞郭兆民孔颖
Owner CHNA ENERGY INVESTMENT CORP LTD
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