Preparation method of LaZSM-5 molecular sieve, its application and using method

A technology of molecular sieve and reaction kettle, which is applied in the field of preparation of LaZSM-5 molecular sieve, can solve the problems of insufficient catalyst activity, expensive catalyst cost, and long production cycle, and achieve the effects of easy large-scale promotion, easy control, and shortened production cycle

Inactive Publication Date: 2017-09-15
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the typical esterification process is to put molten rosin, glycerin with a molecular ratio, and a catalyst into the esterification kettle, and the reaction is carried out at 230-260 ° C, and the generated water is continuously evaporated. Generally, after 8-12 hours of esterification reaction, it can be The product is obtained, but it also has some shortcomings that cannot be ignored in the production process. Due to the traditional catalysts used in production—zinc oxide, palladium carbon, etc., the catalyst activity is not high enough or the catalyst cost is expensive, resulting in a longer production cycle and higher cost. high

Method used

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  • Preparation method of LaZSM-5 molecular sieve, its application and using method
  • Preparation method of LaZSM-5 molecular sieve, its application and using method
  • Preparation method of LaZSM-5 molecular sieve, its application and using method

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Embodiment 1

[0031] The preparation method of present embodiment LaZSM-5 molecular sieve, carry out according to the following steps:

[0032] Step 1. At 40°C, add 100mL of deionized water and 30mL of 40% tetrapropylammonium hydroxide solution to the beaker, transfer to a constant temperature magnetic stirrer and stir for 30min, then add 25mL of ethyl orthosilicate, 0.4g Aluminum sulfate, 0.3g sodium hydroxide and 0.6g lanthanum carbonate were stirred for 3 hours at 28°C to obtain a reaction mixture;

[0033] Step 2. Transfer the reaction mixture to a stainless steel reactor (lined with polytetrafluoroethylene) under airtight conditions, and crystallize at 180°C for 48 hours to obtain a crystallized product;

[0034] Step 3, cooling the crystallized product to room temperature with water, washing with deionized water for 3 times, transferring the washed crystallized product to a drying oven, and drying at 110°C for 20 hours to obtain a white powder;

[0035] Step 4: Transfer the white pow...

Embodiment 2

[0037] The preparation method of present embodiment LaZSM-5 molecular sieve, carry out according to the following steps:

[0038] Step 1. At 20°C, add 120mL deionized water and 15mL n-butylamine to the beaker, transfer to a constant temperature magnetic stirrer and stir for 30min, then add 40mL fuming silica gel, 0.25g sodium metaaluminate, and 0.6g sodium hydroxide and 0.25g of lanthanum nitrate, stirred at 20°C for 3h to obtain a reaction mixture;

[0039] Step 2. Transfer the reaction mixture to a stainless steel reactor (lined with polytetrafluoroethylene) under airtight conditions, and crystallize at 185°C for 28 hours to obtain a crystallized product;

[0040] Step 3: cooling the crystallized product to room temperature, washing with deionized water for 4 times, transferring the washed crystallized product to a drying oven, and drying at 115°C for 16 hours to obtain a white powder;

[0041] Step 4: Transfer the white powder to a muffle furnace and calcinate at 560° C. f...

Embodiment 3

[0043] The preparation method of present embodiment LaZSM-5 molecular sieve, carry out according to the following steps:

[0044] Step 1. At 35°C, add 200mL deionized water and 45mL ethylenediamine to the beaker, transfer to a constant temperature magnetic stirrer and stir for 30min, then add 35mL tetraethyl orthosilicate, 0.65g pseudoboehmite, 0.45g Sodium hydroxide and 0.2 g of lanthanum chloride were stirred for 3 h at 34 ° C to obtain a reaction mixture;

[0045] Step 2. Transfer the reaction mixture to a stainless steel reactor (lined with polytetrafluoroethylene) under airtight conditions, and crystallize at 195°C for 24 hours to obtain a crystallized product;

[0046] Step 3, cooling the crystallized product to room temperature, washing with deionized water three times, transferring the washed crystallized product to a drying oven, and drying at 120°C for 22 hours to obtain a white powder;

[0047] Step 4: Transfer the white powder to a muffle furnace and calcinate at ...

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Abstract

The invention discloses a preparation method of a LaZSM-5 molecular sieve, its application and a using method. The LaZSM-5 molecular sieve compounded by an in-situ synthesis method is used as a catalyst for compounding glycerol ester of rosin; catalytic activity of LaZSM-5 molecular sieve in the esterification reaction is enhanced by increasing L acid center amount on the LaZSM-5 molecular sieve. Besides, the production technique of compounding glycerol ester of rosin by the catalyst of the LaZSM-5 molecular sieve is continuous; the preparation method is gentle in reaction condition, convenient to operate, clean and environment-friendly, low in cost, high in efficiency, strong in practicability, and easy to carry out the industrial production and application.

Description

technical field [0001] The invention relates to the technical field of rosin deep processing, in particular to a preparation method of LaZSM-5 molecular sieve and its application and use method. Background technique [0002] ZSM-5 molecular sieve is a new structure zeolite molecular sieve with high silicon three-dimensional crossed straight channels first developed by Mobile Company of the United States in 1972. Because of its unique pore structure, it not only provides space restriction for shape-selective catalysis, but also provides space for reaction. It also provides a crystal structure basis for the preparation of industrial catalysts with high selectivity, high activity, and strong resistance to carbon deposition and deactivation. ZSM-5 molecular sieve catalyzes the esterification reaction of rosin and glycerin. It has the advantages of non-corrosive equipment, high temperature resistance, convenient preparation, high activity, easy separation from products and good r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/40C07C67/08C07C69/753B01J29/40
CPCC01B39/40B01J29/40C01P2002/72C01P2002/82C01P2004/03C01P2004/38C01P2004/61C07C67/08C07C69/753
Inventor 王潇潇卫贤贤刘振民薛永兵王远洋
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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