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Phosphorus-modified ZSM-5 molecular sieve and preparation method thereof

A technology of ZSM-5 and molecular sieve, which is applied in the direction of molecular sieves and alkali exchange compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of destroying the molecular sieve skeleton structure and decreasing the crystallinity of molecular sieves, so as to reduce energy consumption and time, and effectively Facilitate the effect of large-scale production

Pending Publication Date: 2021-03-23
山西腾茂科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the tetraethoxyphosphorus hydroxide used in this method is strongly alkaline, and at the same time when the ZSM-5 molecular sieve is modified with phosphorus, the molecular sieve skeleton structure will be destroyed, resulting in a decrease in the crystallinity of the modified molecular sieve.

Method used

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  • Phosphorus-modified ZSM-5 molecular sieve and preparation method thereof
  • Phosphorus-modified ZSM-5 molecular sieve and preparation method thereof

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Embodiment 1

[0025] The method of the invention prepares phosphorus-modified ZSM-5 molecular sieves.

[0026] With 480 grams of ZSM-5 molecular sieves (dry basis, SiO 2 / Al 2 o 3 = 33), 7.57 grams of tetrakis hydroxymethyl phosphorus chloride and 1200 grams of deionized water were mixed, beaten, heated to 60 ° C, continued stirring for 3 hours, then filtered, dried, and roasted at 500 ° C for 3 hours to obtain Phosphorus modified ZSM-5 molecular sieve PZSM-S1.

Embodiment 2

[0028] The method of the invention prepares phosphorus-modified ZSM-5 molecular sieves.

[0029] With 535 grams of ZSM-5 molecular sieves (dry basis, SiO 2 / Al 2 o 3 =33), 3.05 grams of tetrakis hydroxymethyl phosphorus sulfate and 2140 grams of deionized water were mixed and beaten, heated up to 70°C, kept stirring for 2 hours, then filtered, dried, and roasted for 4 hours at a temperature of 400°C to obtain phosphorus Modified ZSM-5 molecular sieve PZSM-S2.

Embodiment 3

[0031] The method of the invention prepares phosphorus-modified ZSM-5 molecular sieves.

[0032] With 615 grams of ZSM-5 molecular sieves (dry basis, SiO 2 / Al 2 o 3 =33), 29.2 grams of tetrakis hydroxymethyl phosphorus chloride, 35.3 grams of tetrakis hydroxymethyl phosphorus sulfate and 4920 grams of deionized water were mixed and beaten, and the temperature was raised to 90° C., and the stirring reaction was continued for 0.5 hour, then filtered, dried, and dried at 700 Calcining at ℃ for 1 hour to obtain phosphorus-modified ZSM-5 molecular sieve PZSM-S3.

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Abstract

The invention provides a modified ZSM-5 molecular sieve and a preparation method thereof. The preparation method comprises the following steps that the ZSM5 molecular sieve, a phosphorus-containing cationic compound and deionized water are mixed, pulped, heated to 60-90 DEG C, continuously stirred for reaction for 0.5-3 h, then filtering and drying are conducted, and roasting is conducted for 1-4h at the temperature of 400-700 DEG C, so that the phosphorus-modified ZSM-5 molecular sieve is obtained. The modification method provided by the invention can obtain the phosphorus-modified ZSM-5 molecular sieve with high crystallinity and high cracking activity, and has the characteristics of simple process and no loss of phosphorus element.

Description

technical field [0001] The invention relates to a phosphorus-modified ZSM-5 molecular sieve and a preparation method thereof, in particular to a phosphorus-modified ZSM-5 molecular sieve which can be used for catalytic cracking reaction and a preparation method thereof. Background technique [0002] Propylene is one of the most important organic chemical raw materials, its largest use is the production of polypropylene, accounting for about 52%, followed by the production of acrylonitrile 12%, propylene oxide 7%, cumene 7%, isopropanol 4%, Carbonyl Alcohol 9% and Other 9%. With the development of the national economy, the demand for propylene is increasing day by day. In recent years, the growth rate of propylene demand has been higher than that of ethylene. Naphtha cracking co-produces ethylene and propylene, the typical ratio of propylene to ethylene is 6.5:1, and the shortfall is mainly supplemented by the catalytic cracking (FCC) unit of the refinery. [0003] The FCC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/38C01B39/02
CPCC01B39/38C01B39/026
Inventor 王丽陈强
Owner 山西腾茂科技股份有限公司
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