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Synthesis method of nano BaKL zeolite applied to aromatization of low-carbon alkane

A technology of low carbon alkane and synthesis method, which is applied in chemical instruments and methods, L-type crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc. It can improve the yield of aromatics, increase the single-pass life, and improve the utilization rate of raw materials.

Active Publication Date: 2021-12-17
奥斯催化材料(大连)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems are that the ratio of silicon to aluminum is high, the utilization rate of silicon is low, and the synthesis cost is high.

Method used

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  • Synthesis method of nano BaKL zeolite applied to aromatization of low-carbon alkane
  • Synthesis method of nano BaKL zeolite applied to aromatization of low-carbon alkane
  • Synthesis method of nano BaKL zeolite applied to aromatization of low-carbon alkane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh 12.25 g KOH in a 500 mL beaker, add 10 g pure water, stir well and add 7.06 g Al(OH) 3 , heated to 95ºC and stirred to make the solution clear. After the solution is cooled, add 117.12 g of pure water, add 0.097 g of barium nitrate, and continue stirring. Take another 500 mL beaker and weigh 49.48 g of silica sol, then use a separatory funnel to separate the clarified Al(OH) 3 The solution was added dropwise to the silica sol, and stirring was continued for 8 h. Stirring was stopped, and the gel was placed in a 200 mL crystallization kettle. The crystallization kettle was put into an oven for dynamic crystallization at 170°C for 18 h. After the crystallization is completed, the crystallization tank is taken out, and then the sample is centrifuged and washed with pure water until the pH is 7 or 8. The sample was transferred to a crucible and dried in an oven at 120 ºC for 12 h, and the yield was 91%.

[0037] The molecular sieve is ground into powder, and anal...

Embodiment 2

[0041] Weigh 1.53 g KOH in a 100 mL beaker, add 2 g pure water, stir evenly, add 3.53 g Al(OH) 3 , heated to 95ºC and stirred to make the solution clear. After the solution is cooled, add 9 g of pure water, add 0.0061 g of barium chloride, and continue stirring. Take another 100 mL beaker and weigh 30 g of silica sol, then use a separatory funnel to separate the clarified Al(OH) 3 The solution was added dropwise to the silica sol, and stirring was continued for 24 h. Stirring was stopped, and the gel was placed in a 30 mL crystallization kettle. Put the crystallization kettle into the oven and conduct static crystallization at 185ºC for 6 h. After the crystallization is completed, the crystallization tank is taken out, and then the sample is centrifuged and washed with pure water until the pH is 7 or 8. The sample was transferred to a crucible and dried in an oven at 120 ºC for 12 h, and the yield was 67%. According to XRD spectrum analysis, the molecular sieve is BaKL. ...

Embodiment 3

[0043] Weigh 130.13 g KOH in a 2000 mL beaker, add 100 g pure water, stir well and add 30 g Al(OH) 3 , heated to 95ºC and stirred to make the solution clear. After the solution is cooled, add 1030 g of pure water, add 51.52 g of barium acetate, and continue stirring. Take another 2000 mL beaker and weigh 473.79 g of silica sol, then use a separatory funnel to separate the clarified Al(OH) 3 The solution was added dropwise to the silica sol, and stirring was continued for 4 h. Stirring was stopped, and the gel was placed in a 2 L crystallization kettle. Put the crystallization kettle into an oven, and dynamically crystallize at 110°C for 24 h. After the crystallization is completed, the crystallization tank is taken out, and then the sample is centrifuged and washed with pure water until the pH is 7 or 8. The sample was transferred to a crucible and dried in an oven at 120 ºC for 12 h, and the yield was 59%. According to XRD spectrum analysis, the molecular sieve is BaKL. ...

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Abstract

The invention discloses a synthesis method of nano BaKL zeolite applied to aromatization of low-carbon alkane, and belongs to the technical field of zeolite preparation. The method comprises the following steps: mixing a barium source, an alkali source, an aluminum source, a silicon source and water according to a molar ratio to prepare a sol, and performing solid-state or dynamic crystallization to obtain the nano-scale BaKL zeolite. According to the invention, the BaKL zeolite with nanoscale, high crystallinity and hierarchical pore structure can be synthesized under the conditions of low silica-alumina ratio feeding and no addition of a template agent and a structure-directing agent. When the BaKL zeolite provided by the invention is used in a low-carbon alkane aromatization reaction, the yield of aromatic hydrocarbon, especially the yield of C8 aromatic hydrocarbon, can be obviously improved. Compared with a traditional method, the method is simple in preparation process, high in raw material utilization rate, low in cost and wide in application prospect.

Description

technical field [0001] The invention relates to a method for synthesizing nanoscale BaKL zeolite applied to the aromatization of low-carbon alkanes. Background technique [0002] Aromatics occupy a pivotal position in the chemical industry. They are important bulk chemicals and basic chemical raw materials. They are widely used in the manufacture of various important means of production and living. They are also important blending components of high-quality gasoline, which are related to the national economy and people's livelihood. my country is the largest consumer of benzene and p-xylene in the world, and with the development of social economy, the demand is still rising. In 2018, my country's dependence on foreign aromatics was as high as 20%-60%. The development of relevant industrial application technologies for the aromatization of low-carbon alkanes is of great significance to reduce my country's dependence on foreign aromatics. [0003] Pt / KL catalyst is a base-ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/32B01J29/60
CPCC01B39/32B01J29/60C01P2002/72C01P2004/03C01P2006/17Y02P20/52
Inventor 张文赟
Owner 奥斯催化材料(大连)有限公司
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