Method for synthesizing ZSM-22/ZSM-23 composite molecular sieve in low template agent using amount

A composite molecular sieve, ZSM-23 technology, applied in the direction of molecular sieves and alkali exchange compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of increasing the synthesis cost of zeolite molecular sieves, affecting environmental safety, and producing large harmful waste gas, etc., to achieve excellent Catalytic performance, avoiding miscellaneous crystals, and high adaptability

Active Publication Date: 2017-11-03
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

Looking at such conventional crystallization synthesis methods, the synthesis of ZSM-22 / ZSM-23 composite molecular sieves requires the addition of a large amount of organic amines as templates, and these templates eventually need to be decomposed into gas emissions by roasting, which not only improves the quality of zeolite molecular sieves. At the same time, a large amount of harmful waste gas will be generated during the roasting process, which directly affects environmental safety

Method used

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  • Method for synthesizing ZSM-22/ZSM-23 composite molecular sieve in low template agent using amount
  • Method for synthesizing ZSM-22/ZSM-23 composite molecular sieve in low template agent using amount
  • Method for synthesizing ZSM-22/ZSM-23 composite molecular sieve in low template agent using amount

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 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 an initial gel with the following molar ratio Glue mixture (silicon source to 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 - : deionized water = 1: 0.2: 0.05: 5.0: 0.005: 10.0; put the obtained initial gel mixture in an ultrasonic device, perform ultrasonic oscillation for 180 minutes at 25°C, ultrasonic frequency 50kHz, ultrasonic power 100W, and obtain a Ultrasonic mixture; reconstitute the second initial gel mixture (without adding template) according to the above-mentioned raw material ratio, and the molar ratio of the first initial gel to the second initial gel is 5:95 (based on SiO 2meter); the primary ultrasonic mixture w...

Embodiment 2

[0030] 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 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 : Diethylamine: Dimethylformamide + n-Propylamine: OH - : deionized water = 1: 0.1: 0.1: 4.0 (dimethylformamide: n-propylamine = 1: 3, molar ratio): 0.01: 30.0; the resulting initial gel mixture is placed in an ultrasonic device, at 30 ° C, Ultrasonic frequency 40kHz, under the condition of ultrasonic power 500W, carry out ultrasonic oscillation for 120 minutes, obtain an ultrasonic mixture; Reconstitute the second initial gel mixture (without adding template agent) according to the above-mentioned raw material ratio, press the fir...

Embodiment 3

[0032] 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, forming an 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 - : deionized water = 1 (methyl orthosilicate: ethyl orthosilicate = 1:1, molar ratio, with SiO 2 Measure): 0.05: 0.2: 3.0: 0.02: 20.0; place the obtained initial gel mixture in an ultrasonic device, perform ultrasonic oscillation for 60 minutes at 40°C, ultrasonic frequency 60kHz, and ultrasonic power 1000W to obtain an ultrasonic mixture; press The above-mentioned raw material ratio reconstitutes the second initial gel mixture (without adding template), and the mol...

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Abstract

The invention relates to a method for synthesizing a ZSM-22 / ZSM-23 composite molecular sieve in a low template agent using amount. The method comprises the following steps: adding a template agent A and an aluminum source after dissolving an inorganic base source by using deionized water, adding a template agent B and a silicon source after completely dissolving, forming first initial gel, and carrying out ultrasonic oscillation, thus obtaining a primary ultrasonic mixture; preparing second initial gel (no template agent) again according to the same proportion, adding the primary ultrasonic mixture in the second initial gel, and carrying out ultrasonic oscillation after uniformly stirring, thus obtaining a secondary ultrasonic mixture; transferring the obtained secondary ultrasonic mixture into a crystallization kettle, and crystallizing, thus obtaining the ZSM-22 / ZSM-23 composite molecular sieve. By adopting the method disclosed by the invention, the template agent using amount can be greatly reduced, and the molecular sieve synthesis cost and the influence to the environment are reduced; the obtained ZSM-22 / ZSM-23 composite molecular sieve has no a mixed crystal phase, is small and uniform in granularity and good in preparation reproducibility.

Description

technical field [0001] The invention relates to a method for synthesizing ZSM-22 / ZSM-23 composite molecular sieves with low dosage of template agent. Background technique [0002] 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 molecu...

Claims

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Application Information

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IPC IPC(8): C01B39/48C01B39/04
CPCC01B39/04C01B39/48C01P2002/72C01P2004/61C01P2006/12
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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