Method for synthesizing small crystal grain P-ZSM-5 molecular sieve by using low cost raw material

A technology of P-ZSM-5 and ZSM-5, applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve the problems that industrialization cannot be truly realized, and achieve the improvement of hydrothermal Stability, increased propylene yield, and uniform particle size

Active Publication Date: 2014-10-22
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above related documents have prepared P-ZSM-5 molecular sieves by one-step hydrothermal synthesis, but some use expensive organics as templ

Method used

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  • Method for synthesizing small crystal grain P-ZSM-5 molecular sieve by using low cost raw material
  • Method for synthesizing small crystal grain P-ZSM-5 molecular sieve by using low cost raw material
  • Method for synthesizing small crystal grain P-ZSM-5 molecular sieve by using low cost raw material

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Measure 0.72ml of concentrated sulfuric acid and dissolve it in 34.4ml of deionized water with stirring at room temperature, weigh 0.68g of aluminum sulfate, 3.09g of sodium chloride, and 0.165g of isopropanol, and add them to the above mixture in turn and stir for 30 minutes. Measure 0.608 The amount of substance in ml is 1 mol / L diammonium hydrogen phosphate solution, which is slowly added to the above solution and stirred for 1 h, marked as A.

[0030] Weigh 16.7g of water glass and 0.2g of seed crystals and dissolve them completely in 13.7ml of water, stir vigorously to mix the two substances evenly, slowly add 1.74ml of n-butylamine to the above mixture under stirring conditions, stir for 30min, and mark as b. Slowly add solution B to solution A, then stir on a magnetic stirrer for 2 hours, stir and age in a 70oC water bath for 6 hours, then raise the temperature to 180oC to crystallize for 30 hours, immediately cool the reactor to room temperature with tap water a...

Embodiment 2

[0032]Measure 0.36ml of concentrated sulfuric acid and dissolve it in 19.2ml of deionized water with stirring at room temperature, respectively weigh 0.68g of aluminum sulfate, 4.5g of sodium chloride, and 0.1g of isopropanol into the above mixture and stir for 30 minutes, then measure 1.216ml of ammonium dihydrogen phosphate solution with a concentration of 0.4mol / L was slowly added to the above solution and stirred for 1h, marked as A.

[0033] Weigh 10.7g of water glass and 0.4g of seed crystals and dissolve them completely in 25.6ml of water, stir vigorously to mix the two substances evenly, slowly add 2.5ml of n-butylamine dropwise to the above mixture under stirring conditions, stir for 30min, and mark for B. Slowly add solution B to solution A, then stir on a magnetic stirrer for 2 hours, stir and age in a 60oC water bath for 8 hours, then raise the temperature to 180oC for crystallization for 24 hours, immediately cool the reactor to room temperature with tap water aft...

Embodiment 3

[0035] Measure 1.08ml of concentrated sulfuric acid and dissolve it in 24.4ml of deionized water with stirring at room temperature, weigh 0.5g of aluminum sulfate, 3.09g of sodium chloride, and 0.165g of isopropanol, and add them to the above mixture in turn and stir for 30 minutes, then measure 0.608ml of diammonium hydrogen phosphate and ammonium dihydrogen phosphate solution with a substance concentration of 0.6mol / L was slowly added to the above solution and stirred for 2 hours, marked as A.

[0036] Weigh 13g of water glass and 0.2g of seed crystals and completely dissolve them in 10.3ml of water, stir vigorously to mix the two substances evenly, slowly add 1.25ml of n-Damine to the above mixture under stirring conditions, stir for 30min, and mark it as B . Slowly add solution B to solution A, then stir on a magnetic stirrer for 2 hours, stir and age in a 70oC water bath for 12 hours, then crystallize in an oven at 170oC for 36 hours, immediately cool the reactor to room ...

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Abstract

The invention discloses a method for synthesizing a small crystal grain P-ZSM-5 molecular sieve by using a low cost raw material. The method comprises the following steps: mixing aluminum sulfate with concentrated sulfuric acid, NaCl, isopropanol, water glass, n-butylamine, ZSM-5 molecular sieve seeds and a phosphorus-containing aqueous solution, uniformly stirring for ageing, crystallizing, filtering, drying, and roasting to obtain the small crystal grain P-ZSM-5 molecular sieve. The small crystal grain P-ZSM-5 molecular sieve prepared in the invention can be used in heavy oil catalytic cracking catalysts to improve the yield of propylene or improve the octane number of gasoline.

Description

technical field [0001] The invention relates to a method for directly synthesizing small-grain P-ZSM-5 molecular sieves in one step with low-cost raw materials, which belongs to the preparation of zeolite molecular sieve catalysts. Background technique [0002] Low-carbon olefins such as ethylene and propylene are important chemical raw materials. my country is in the stage of rapid economic and social development, and will continue to grow rapidly in a certain period of time in the future. Therefore, the demand for low-carbon olefins will continue to increase. At present, light olefins are mainly produced by steam cracking of hydrocarbons and catalytic cracking of heavy oil. Traditional steam cracking is carried out by free radical reaction, with high temperature and strict requirements on raw materials. The cost of producing low-carbon olefins by catalytic cracking is relatively low, and it is currently a hot spot in domestic and foreign research on increasing the product...

Claims

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Application Information

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IPC IPC(8): C01B39/40
Inventor 唐志诚张朋韩维亮吕功煊潘霞
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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