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Hierarchical porous composite molecular sieve with adjustable acidity distribution and preparation method thereof

A composite molecular sieve and acidic technology, applied in the recovery/refining of mineral wax, crystalline aluminosilicate zeolite, hydrocarbon oil cracking, etc., to achieve the effect of improving product performance, excellent catalytic performance, and high adaptability

Active Publication Date: 2017-10-10
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the shortcomings in the preparation of the current ZSM-22 / ZSM-23 composite molecular sieve and the controllability of the microstructure, the purpose of the present invention is to provide a kind of ZSM-22 and ZSM-23 with controllable relative content and excellent catalytic performance. Multi-stage pore composite molecular sieve with adjustable acid distribution and preparation method thereof

Method used

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  • Hierarchical porous composite molecular sieve with adjustable acidity distribution and preparation method thereof
  • Hierarchical porous composite molecular sieve with adjustable acidity distribution and preparation method thereof
  • Hierarchical porous composite molecular sieve with adjustable acidity distribution and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Add potassium hydroxide to deionized water, stir to dissolve completely, add ethylmethylamine and sodium aluminate successively, continue to stir until the mixture is completely dissolved, then add dimethylamine and silica sol in order to form the first Parts initial gel mixture (silicon source is SiO 2 In terms of aluminum source as Al 2 o 3 In terms of alkali source in OH - meter), SiO 2 :Al 2 o 3 : Ethylmethylamine: Dimethylamine: OH - : The molar ratio of deionized water=1:0.2:0.05:5.0:0.005:10.0; the first initial gel mixture obtained was transferred to a crystallization kettle, and after crystallization at 140°C and autogenous pressure for 48h, The solid product is separated by filtration, washed with deionized water until neutral, and dried to obtain the initial powder of composite silica-alumina molecular sieve; according to the raw material SiO 2 :Al 2 o 3 : Template A: Template B: OH - : The molar ratio of deionized water=1:0.2:0.025:2.5:0.005:10.0 t...

Embodiment 2

[0035] Add potassium hydroxide to deionized water, stir to dissolve completely, then add diethylamine and pseudoboehmite successively, continue stirring until the mixture is completely dissolved, then add dimethylformamide, n-propylamine and silica gel in order to form The first part of initial gel mixture (silicon source with SiO 2 In terms of aluminum source as Al 2 o 3 In terms of alkali source in OH - meter), SiO 2 :Al 2 o 3 : Diethylamine: Dimethylformamide + n-Propylamine: OH - : The molar ratio of deionized water = 1: 0.1: 0.1: 4.0 (the molar ratio of dimethylformamide: n-propylamine = 1: 1): 0.01: 30.0; transfer the obtained first initial gel mixture into In the crystallization kettle, after crystallization at 145°C and autogenous pressure for 48 hours, the solid product was separated by filtration, washed with deionized water until neutral, and dried to obtain the initial powder of composite silicon-aluminum molecular sieve; according to the ratio of raw materia...

Embodiment 3

[0037] Add potassium hydroxide to deionized water, stir to dissolve completely, add 1,6-hexamethylenediamine, aluminum chloride successively, continue to stir until the mixture is completely dissolved, then add isopropylamine, methyl orthosilicate and orthosilicate in order ethyl ester to form the first initial gel mixture with the following molar ratio (silicon source is SiO 2 In terms of aluminum source as Al 2 o 3 In terms of alkali source in OH - meter), SiO 2 :Al 2 o 3 : 1,6-hexanediamine: Isopropylamine: OH - : The molar ratio of deionized water = 1 (methyl orthosilicate: ethyl orthosilicate = 1:1, with SiO 2 molar ratio): 0.05: 0.2: 3.0: 0.02: 20.0; transfer the obtained first initial gel mixture into a crystallization kettle, crystallize at 150°C for 24 hours under autogenous pressure, and separate the solid product by filtration. Wash with deionized water until neutral, and dry to obtain the initial powder of composite silica-alumina molecular sieve; according ...

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Abstract

The invention relates to a hierarchical porous composite molecular sieve with adjustable acidity distribution. The composition of the molecular sieve in molar ratio is that SiO2:Al2O3 is equal to 4.6-982, the molecular sieve contains TON and MTT framework topological structures, the molar ratio of ZSM-22 to ZSM-23 is (10-90):(90-10), the specific surface area of BET is 253.2-283.7m<2> / g, and each granule is a stick-like substance with the length less than or equal to 1 Mum and the outer diameter of 20-30nm. The composite molecular sieve provided by the invention has the characteristics of hierarchical acidity, hierarchical pores and the like, the TON / MTT proportional distribution is adjustable, and silica-alumina ratio can be adjusted and changed in a wider range.

Description

[0001] Field [0002] The invention relates to a composite molecular sieve with adjustable acidity distribution and a preparation method thereof. Background technique [0003] With the increasingly stringent requirements of environmental protection regulations and the rapid development of the automobile industry, the demand for high-quality lubricating oil is gradually increasing for new types of machinery and equipment, and the quality requirements are also getting higher and higher. Therefore, it is imperative to develop lubricating oil quality to II and III oils with low nitrogen, low sulfur, low ash content, high oxidation resistance, high detergency, dispersibility, low volatility, good viscosity temperature and low temperature fluidity , so that the base oil production process based on solvent refining and catalytic dewaxing is gradually replaced by isomerization dewaxing process. The isomerization dewaxing reaction is to convert the long side chains of wax molecules an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02C10G47/16
CPCC01B39/02C01P2002/72C01P2004/03C01P2004/16C01P2004/62C01P2004/64C01P2004/82C01P2006/12C10G47/16C10G73/00C10G2300/70
Inventor 李德宝林明桂侯博贾丽涛郗宏娟陈晓燕
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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