Method for preparing ZSM-35 molecular sieve

A technology of ZSM-35 and molecular sieve, applied in the field of preparing ZSM-35 molecular sieve, can solve the problems of long crystallization time, large grain size of ZSM-35 molecular sieve, low crystallinity, etc., to shorten the crystallization time and improve the mass transfer rate. , the effect of crystallinity improvement

Active Publication Date: 2010-12-29
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The crystallization time of ZSM-35 molecular sieve synthesized by conventional method is long, and the obtained ZSM-35 molecular sieve has large crystal grains and low crystallinity

Method used

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  • Method for preparing ZSM-35 molecular sieve
  • Method for preparing ZSM-35 molecular sieve
  • Method for preparing ZSM-35 molecular sieve

Examples

Experimental program
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Effect test

Embodiment 1

[0034] First, 8.3 grams of aluminum sulfate (analytical pure, content greater than 99.5%) was added to 23.5 ml of deionized water under stirring at room temperature, and stirred for 40 minutes. After the aluminum sulfate is completely dissolved, slowly add 67.5 grams of silica sol (SiO 2 content is 22.2% silica sol), stirred for 1 hour, and then slowly added 10 ml of 0.5 mol / L sodium hydroxide aqueous solution to form a colloidal solution. The colloidal solution was placed in an aqueous medium at 70° C. and treated with an ultrasonic wave with a frequency of 40 kHz for 90 minutes, so that the colloidal solution was fully aged and dispersed. Then turn off the ultrasound, cool to room temperature, add 7.5ml cyclohexylamine as a template agent and 0.36g ZSM-35 molecular sieve powder as a seed crystal, stir evenly to prepare a reaction mixture. The mixture has the following molar composition: OH-: Al 2 o 3 : SiO 2 :R:H 2 O=0.2:0.05:1:0.3:20. The reaction mixture was transfer...

Embodiment 2

[0036] First, 8.3 grams of aluminum sulfate (analytical pure, content greater than 99.5%) was added to 23.5 ml of deionized water under stirring at room temperature, and stirred for 40 minutes. After the aluminum sulfate is completely dissolved, slowly add 67.5 grams of silica sol (SiO 2 content is 22.2% silica sol), stirred for 1 hour, and then slowly added 10 ml of 0.5 mol / L sodium hydroxide aqueous solution to form a colloidal solution. The colloidal solution was placed in an aqueous medium at 70° C. and treated with an ultrasonic wave with a frequency of 50 kHz for 65 minutes, so that the colloidal solution was fully aged and dispersed. Then turn off the ultrasound, cool to room temperature, add 10.1ml ethylenediamine as a template agent and 0.36g ZSM-35 molecular sieve powder as a seed crystal, and stir evenly to prepare a reaction mixture. This mixture has the following molar composition: OH - :Al 2 o 3 : SiO 2 :R:H 2 O=0.2:0.05:1:0.6:20. After the reaction mixtur...

Embodiment 3

[0038] First, 8.3 grams of aluminum sulfate (analytical pure, content greater than 99.5%) was added to 23.5 ml of deionized water under stirring at room temperature, and stirred for 40 minutes. After the aluminum sulfate is completely dissolved, slowly add 33.7 grams of silica sol (SiO 2 content is 22.2% silica sol), stirred for 1 hour, and then slowly added 10 ml of 0.5 mol / L sodium hydroxide aqueous solution to form a colloidal solution. The colloidal solution was placed in an aqueous medium at 70° C. and treated with an ultrasonic wave with a frequency of 40 kHz for 70 minutes, so that the colloidal solution was fully aged and dispersed. Then turn off the ultrasound, cool to room temperature, add 7.5ml cyclohexylamine as a template agent and 0.36g ZSM-35 molecular sieve powder as a seed crystal, stir evenly to prepare a reaction mixture. This mixture has the following molar composition: OH - :Al 2 o 3 : SiO 2 :R:H 2 O=0.4:0.1:1:0.6:27. The reaction mixture was transf...

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Abstract

The invention provides an improved method for preparing a ZSM-35 molecular sieve. The method comprises the following steps of: uniformly mixing a silicon source, an aluminum source, an alkali source and water to obtain colloidal solution; ultrasonically vibrating and aging the colloidal solution; adding a template agent into the colloidal solution; and hydrothermally crystallizing the mixture to obtain the ZSM-35 molecular sieve. The method can remarkably shorten the crystallization time of the ZSM-35 molecular sieve and enhance the degree of crystallization of a synthetic product; and the generated molecular sieve has small crystal grains and uniform particles and can be taken as a catalyst in the process of isomerizing an n-butene framework into isobutene.

Description

technical field [0001] The present invention relates to an improved method for preparing ZSM-35 molecular sieve, specifically, relates to a method for preparing ZSM-35 molecular sieve by ultrasonic vibration aging treatment before crystallization, in addition, the present invention also relates to the preparation of ZSM-35 molecular sieve by the method of the present invention Use of the ZSM-35 molecular sieve as a catalyst in the isomerization of n-butene to isobutene. Background technique [0002] Since methyl tert-butyl ether (MTBE) and ethyl tert-butyl ether (ETBE) show high octane number, low vapor pressure and good performance in gasoline distillate hydrocarbons in reformulated gasoline and oxygenated gasoline Solubility makes it an excellent gasoline additive component, and the demand is increasing rapidly around the world, so that the output of isobutene obtained by traditional petroleum catalytic cracking and thermal processing is far from meeting the needs of ether...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/44B01J29/65C07C5/27C07C11/09
Inventor 任行涛伦志红杨光裴庆君刘艳慧
Owner CHINA PETROLEUM & CHEM CORP
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