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Method for preparing aromatic hydrocarbon

A technology for aromatic hydrocarbons and hydrocarbons, which is used in the field of catalysts for preparing aromatic hydrocarbons with methanol or co-feeding of the two, and in the field of hydrocarbon compounds, which can solve the problems of easy aggregation or loss of metal components, rapid decrease in aromatic hydrocarbon selectivity, and low BTX selectivity. , to achieve the effect of inhibiting rapid coking and carbon deposition, effective circulating logistics, and high aromatization efficiency

Pending Publication Date: 2020-08-14
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, dry gas and aromatics are exported to the system as products, while C 3+ Non-aromatic enters the dehydrogenation reactor for dehydrogenation, and the C after dehydrogenation 3+ Non-aromatic returns to the methanol alkylation reactor to continue the reaction, and the yield of aromatics is low
The process uses three reactors, the amount of catalyst used is large, and the process flow is complicated
[0006] In addition, studies have shown that metal components are easy to accumulate or lose under high temperature conditions, the selectivity of aromatics decreases rapidly, the catalyst life is short, the selectivity of BTX is not high, and the performance of catalysts decreases significantly after regeneration. Large-scale industrial application of technology
There are few reports on the combination of metal and metalloid to control the catalytic effect, and there are few reports on the use of carbon dioxide in the preparation of aromatic hydrocarbons

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Preparation: The HZSM-5 molecular sieve with a silicon-aluminum ratio of 46 was prepared by a hydrothermal method. 2) Loading: The roasted product obtained in step 1) was immersed in a zinc nitrate solution with a concentration of 1 wt% and a chromium nitrate solution with a concentration of 5 wt%, immersed for 10 h, centrifuged, dried overnight at 110 °C, and finally roasted at 550 °C for 5 h; The obtained zinc and chromium modified zeolite is designated as catalyst A.

[0027] performance evaluation 1

Embodiment 2

[0037] This example serves to illustrate the catalyst of the present invention.

[0038] 1) Preparation: The HZSM-5 molecular sieve with a silicon-aluminum ratio of 46 was prepared by a hydrothermal method. 2) Loading: The roasted product obtained in step 1) was immersed in a zinc nitrate solution with a concentration of 1 wt% and a chromium nitrate solution with a concentration of 5 wt%, immersed for 10 h, centrifuged, dried overnight at 110 °C, and finally roasted at 550 °C for 5 h; The obtained zinc and chromium modified zeolite is designated as catalyst A.

[0039] 3) Secondary loading: The roasted product obtained in step 2) was immersed in ammonium dihydrogen phosphate solution with a concentration of 3 wt%, immersed for 10 h, centrifuged, dried at 110 °C overnight, and finally roasted at 550 °C for 5 h; zinc, chromium , P modified zeolite, denoted as catalyst B.

[0040] performance evaluation

Embodiment 3

[0043] This example serves to illustrate the catalyst of the present invention.

[0044] 1) Preparation: The HZSM-5 molecular sieve with a silicon-aluminum ratio of 46 was prepared by a hydrothermal method. 2) Loading: The roasted product obtained in step 1) was immersed in a solution of 1 wt% zinc nitrate and 5 wt% chromium nitrate solution, immersed for 10 h, centrifuged, dried overnight at 110 °C, and finally roasted at 550 °C for 5 h; The obtained zinc and chromium modified zeolite is designated as catalyst A. 3) Secondary load

[0045] Immerse the calcined product obtained in step 2) in ammonium dihydrogen phosphate solution with a concentration of 3 wt%, immerse for 10 h, centrifuge, dry overnight at 110°C, and finally roast at 550°C for 5 h; obtain zinc, chromium, and P modified zeolite, Denoted as Catalyst B.

[0046] Performance evaluation: using Example 3 as an example to evaluate the performance of catalyst B.

[0047] 1) 1.0 g of Catalyst B was loaded into a fi...

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Abstract

The invention discloses a method for preparing aromatic hydrocarbon. In the method, a fixed bed reactor is adopted; by adopting light hydrocarbon and methanol or a mixture of the light hydrocarbon andmethanol as raw materials, and under the function of a catalyst, products are converted to two extremes, namely C1-C3 gaseous hydrocarbon and liquid aromatic hydrocarbon; high-yield aromatic hydrocarbon can be obtained and the total aromatic hydrocarbon yield can be 90 wt% or above; meanwhile, the obtained aromatic hydrocarbon can be directly used for producing p-xylene without separation, so that the production cost is reduced.

Description

technical field [0001] The invention belongs to the fields of aromatics production in petrochemical and coal chemical industries, and in particular relates to a catalyst and method for preparing aromatics by feeding hydrocarbon compounds, methanol or both. Background technique [0002] Benzene, toluene, and xylene are important basic chemical raw materials, reflecting a country's level of development. In recent years, as the downstream products of aromatics have maintained strong demand, the annual demand for aromatics has increased year by year. With the rapid development of coal chemical industry, methanol production capacity is seriously oversupplied. Moreover, most of the domestic coal chemical and petrochemical by-products produce a large amount of C 1 -C 9 The utilization rate of hydrocarbon resources is low, which seriously affects economic benefits. It is an important and realistic issue to find value-added resources in the downstream market and utilize this part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/48B01J37/10B01J37/02C07C1/20C07C2/86C07C15/02C07C15/04C07C15/06C07C15/08
CPCB01J29/48B01J37/10B01J37/0201C07C1/20C07C2/864B01J2229/18C07C15/02C07C15/04C07C15/06C07C15/08Y02P20/52
Inventor 范素兵王丹吕俊敏赵天生
Owner NINGXIA UNIVERSITY
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