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Catalyst and method for improving selectivity of preparation of aromatic hydrocarbon products from methanol

A selective, catalyst technology, applied in the direction of carbon compound catalyst, physical/chemical process catalyst, catalyst, etc., can solve the problem of low yield of aromatics and BTX, etc.

Inactive Publication Date: 2016-09-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the technical problems to be solved by the present invention is the low yield of aromatics and BTX (benzene, toluene, xylene) in the process of producing aromatics from methanol. A catalyst for improving the selectivity of aromatics produced from methanol is provided.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1. Catalyst preparation

[0017] (1) The commercially available powdered HZSM-5 with a Si / Al ratio of 38 was pressed into tablets with a tablet machine and crushed into 14-20 meshes. After drying in an oven at 150°C for 4 hours, the water absorption was measured and 6g of molecular sieves were taken. spare.

[0018] (2) According to the water absorption in (1), the metal atom that can load 1.5wt% is impregnated by equal volume to prepare a certain concentration of zinc nitrate, nickel nitrate mixed solution, excessively impregnating the molecular sieve in (1), and standing in room temperature After 15 hours, the excess solution was sucked out with a vacuum pump and dried in an oven at 105° C. for 4 hours.

[0019] (3) Take a certain amount of cerium nitrate hexahydrate preparation solution, excessively impregnate the molecular sieve in (2) to make it load 0.5wt% cerium metal, after standing at room temperature for 15 hours, utilize a vacuum pump to remove excess soluti...

Embodiment 2

[0023] 1. Catalyst Preparation

[0024] (1) The commercially available powdered HZSM-5 with a Si / Al ratio of 38 was pressed into tablets with a tablet machine and crushed into 14-20 meshes. After drying in an oven at 150°C for 4 hours, the water absorption was measured and 6g of molecular sieves were taken. spare.

[0025] (2) According to the water absorption in (1), the metal atom that can load 2.5wt% is impregnated according to equal volume to prepare a certain concentration of zinc nitrate, nickel nitrate mixed solution, excessive impregnation of the molecular sieve in (1), let stand at room temperature After 15 hours, the excess solution was sucked out with a vacuum pump and dried in an oven at 105° C. for 4 hours.

[0026] (3) Take a certain amount of cerium nitrate hexahydrate preparation solution, excessively impregnate the molecular sieve in (2) to make it load 1.0wt% cerium metal, and after standing at room temperature for 15 hours, utilize a vacuum pump to remove e...

Embodiment 3

[0030] 1. Catalyst Preparation

[0031] (1) The commercially available powdered HZSM-5 with a Si / Al ratio of 38 was pressed into tablets with a tablet machine and crushed into 14-20 meshes. After drying in an oven at 150°C for 4 hours, the water absorption was measured and 6g of molecular sieves were taken. spare.

[0032] (2) According to the water absorption in (1), the metal atom that can load 1.5wt% is impregnated by equal volume to prepare a certain concentration of zinc nitrate, silver nitrate mixed solution, excessively impregnating the molecular sieve in (1), and standing in room temperature After 15 hours, the excess solution was sucked out with a vacuum pump and dried in an oven at 105° C. for 4 hours.

[0033](3) Take a certain amount of cerium nitrate hexahydrate preparation solution, excessively impregnate the molecular sieve in (2) to make it load 0.5wt% cerium metal, after standing at room temperature for 15 hours, utilize a vacuum pump to remove excess solutio...

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Abstract

The invention relates to a catalyst and a method for improving the selectivity of preparation of aromatic hydrocarbon products from methanol in order to mainly solve the problem of low aromatic hydrocarbon yield caused by generation of a large amount of low carbon alkanes due to a hydrogen transfer reaction in the aromatization process. ZSM-5 molecular sieve is modified with different concentrations of Zn, Ag, Ni, Mo, Cu, Pt, Ga and other dehydrogenation metals, the modified ZSM-5 molecular sieve is processed to contain high valence oxide of V, Ce, Fe, La, Co, Au or Cr, the obtained ZSM-5 molecular sieve catalyzes efficient aromatization of methanol in weak oxidation gas and other inert diluted gas mixed reaction atmosphere, the partial pressure ratio of methanol is 0.1-10, the reaction temperature is 350-550DEG C, and the operating pressure is 0.1-4.0MPa. A catalyst is used to accelerate dehydrogenation aromatization of intermediate olefin substances, and the high valence metal oxide in the catalyst accelerates activation, and cooperates with weak oxidation gas to realize in situ elimination of hydrogen, so the alkane content in the product reaches the aromatic hydrocarbon selectivity improving purpose, and the aromatic hydrocarbon selectivity is higher than 72wt%.

Description

technical field [0001] The invention relates to a catalyst and a method for improving the selectivity of methanol for producing aromatic products. Background technique [0002] As an important organic chemical raw material, aromatics are widely used in pesticides, dyes, organic materials and other fields, especially the demand for light aromatics BTX (benzene, toluene and xylene) will grow by about 3.5-4.0wt% in the next five years . Aromatics in my country are mainly produced and supplied by petroleum-based production such as catalytic reforming and cracking processes in refineries. With the gradual shortage of resources, the supply gap of aromatics is bound to increase day by day. However, the production of methanol in my country is seriously oversupplied, and the product separation cost of the MTA route is relatively low. The production of aromatics from methanol can optimize the energy structure and alleviate the shortage of aromatics in excess methanol in my country. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/20C07C15/02B01J29/46B01J29/40B01J29/48
CPCB01J29/405B01J29/46B01J29/48B01J2229/18C07C1/20C07C2529/40C07C2529/46C07C2529/48C07C15/02Y02P20/52
Inventor 蒋斌波许彩霞廖祖维王中仁陆飞鹏王靖岱黄正梁阳永荣吴美玲
Owner ZHEJIANG UNIV
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