Method for preparing isohexadecane by adopting high-efficiency double-function catalyst

A bifunctional catalyst, the technology of isohexadecane, which is applied in the field of producing isoparaffins, can solve the problems of low reaction activity and isomerization selectivity, short service life of the catalyst, frequent regeneration, etc., so as to improve the reaction activity and isomerization Structuring selectivity, improving diffusion performance, and reducing carbon deposition

Active Publication Date: 2019-10-08
HEILONGJIANG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of high cost, low reaction activity and isomerization selectivity, short service life of the catalyst, frequent regeneration, etc. A method for preparing isohexadecane with high selectivity using a bifunctional catalyst supported by SAPO-4 molecular sieve nanosheets with a small amount of metal Pd

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  • Method for preparing isohexadecane by adopting high-efficiency double-function catalyst
  • Method for preparing isohexadecane by adopting high-efficiency double-function catalyst
  • Method for preparing isohexadecane by adopting high-efficiency double-function catalyst

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specific Embodiment approach 1

[0019] Specific implementation mode 1: In this implementation mode, the method for preparing isohexadecane by using a high-efficiency dual-function catalyst is implemented according to the following steps:

[0020] The bifunctional catalyst is loaded into the constant temperature zone of the fixed-bed reactor, under H 2 Activate the atmosphere at 350-450°C for 1.0-4.0h, and then use a (trace) feed pump to continuously inject n-hexadecane into the fixed-bed reactor after dropping to the initial reaction temperature, control the reaction temperature at 260-380°C, and the reaction pressure 1.0~4.0MPa, the mass space velocity of n-hexadecane is 1.5~4.5h -1 , H 2 The volume ratio to n-hexadecane is (400-900): 1 to obtain isohexadecane;

[0021] The bifunctional catalyst is formed by loading 0.02-0.09 wt.% Pd on the multi-level porous SAPO-41 molecular sieve nano sheet.

[0022] This embodiment provides a high-efficiency bifunctional catalyst prepared by carrying a small amount o...

specific Embodiment approach 2

[0023] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the preparation method of the described bifunctional catalyst is:

[0024] 1. 10-14g of phosphoric acid with a mass concentration of 85%, 6-8g of pseudoboehmite, 6-8g of silica sol, 12-16g of di-n-butylamine and 4.21-21.06g of crystal growth inhibitor are stirred Add to deionized water in turn, stir evenly to get the initial gel;

[0025] 2. Transfer the initial gel to a stainless steel crystallization kettle lined with polytetrafluoroethylene, crystallize at 175-195°C for 10-60 hours, collect the crystallized product and cool it to room temperature, then centrifuge, wash and dry , the dried crystallized product is placed in a muffle furnace for roasting treatment to obtain a (white) solid reaction powder that is a hierarchically porous SAPO-41 molecular sieve, and the solid reaction powder and Pd(NO 3 ) 2 The solution is impregnated to obtain a bifunctional catalyst; ...

specific Embodiment approach 3

[0028] Specific embodiment three: the difference between this embodiment and specific embodiment two is that in step one, 12.71g mass concentration is 85% phosphoric acid, 7.88g pseudo-boehmite, 7.67g silica sol, 15g di-n-butylamine and 4.21~ 21.06 g of crystal growth inhibitors were sequentially added into deionized water under stirring conditions.

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Abstract

The invention discloses a method for preparing isohexadecane by adopting a high-efficiency double-function catalyst, relates to a method for preparing isoparaffin by long carbon chain hydrogenation ofn-alkanes isomerization reaction, and aims to solve the problems of high cost, low reaction activity and low isomerization selectivity caused by large load of precious metals in an existing catalyst.The preparation method includes the following steps that the double-function catalyst is loaded into a constant temperature zone of a fixed bed reactor, after activation, the isohexadecane is continuously injected into the fixed bed reactor through a feeding pump, the reaction temperature is controlled at 260-380 DEG C, the reaction pressure is 1.0-4.0MPa, and the isohexadecane is obtained. According to the method for preparing the isohexadecane by adopting the high-efficiency double-function catalyst, the catalyst is the double-function catalyst prepared by a supported precious metal Pd as low as 0.09wt.% on a hierarchical pore SAPO-41 molecular sieve nano sheet, the cost of the catalyst is greatly lowered, the diffusion performance of the isoparaffin is greatly improved, and at the sametime, the reaction activity and the isomerization selectivity of the catalyst are improved.

Description

technical field [0001] The invention relates to a method for preparing isoparaffins through hydroisomerization reaction of normal paraffins by using a bifunctional catalyst. Background technique [0002] In the current worldwide energy structure, traditional fossil fuels such as coal, oil and natural gas are still dominant, and petroleum raw materials are mainly converted into fuel oils such as gasoline and diesel through processes such as catalytic cracking, catalytic reforming or isomerization. However, with the continuous exploitation of fossil fuels such as oil and the rapid development of the global economy, the contradiction between the decreasing non-renewable fossil energy and the increasing energy demand has become more prominent. On the one hand, the fuel oil currently used in my country mainly comes from distillate oil refined from petroleum. Due to the shortage of petroleum and the increasing dependence on foreign countries, there is an urgent need to replace raw...

Claims

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Application Information

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IPC IPC(8): C07C5/27B01J29/85C07C9/22
CPCC07C5/2775B01J29/85B01J2229/18C07C2529/85C07C9/22
Inventor 吴伟贾国志白雪峰王巍郭春牧
Owner HEILONGJIANG UNIV
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