A method for preparing isohexadecane by using a bifunctional catalyst

A dual-function catalyst, isohexadecane technology, applied in the field of isoparaffin production, can solve the problems of low reaction activity and isomerization selectivity, short catalyst life cycle, frequent regeneration, etc., to improve the reaction activity and isohexadecane Structure selectivity, improve diffusion performance, reduce the effect of carbon deposition

Active Publication Date: 2022-03-15
HEILONGJIANG UNIV
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  • Application Information

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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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  • A method for preparing isohexadecane by using a bifunctional catalyst
  • A method for preparing isohexadecane by using a bifunctional catalyst
  • A method for preparing isohexadecane by using a bifunctional 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

A method for producing isohexadecane by using a high-efficiency dual-function catalyst. The invention relates to a method for producing isoparaffins by hydroisomerization of long-carbon-chain n-paraffins. Problems such as high cost, low reactivity and isomerization selectivity caused by large amount. Preparation method: fill the bifunctional catalyst into the constant temperature zone of the fixed bed reactor, inject n-hexadecane into the fixed bed reactor continuously with the feed pump after activation, control the reaction temperature at 260-380°C, and the reaction pressure at 1.0 ~4.0MPa, to obtain isohexadecane. The catalyst used in the present invention is a bifunctional catalyst prepared by loading as low as 0.09wt.% noble metal Pd on the hierarchically porous SAPO-41 molecular sieve nanosheet, which not only significantly reduces the cost of the catalyst, but also greatly improves the performance of isoparaffins. Diffusion performance, while improving the reactivity and isomerization selectivity of the catalyst.

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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Patent Type & Authority Patents(China)
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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