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Catalyst used for synthesis of paraxylene through alkylation reactions between coking benzene and methanol and preparation method thereof

A p-xylene and catalyst technology, applied in the field of catalysts, can solve the problems of increased raw material costs, catalyst poisoning and deactivation, and inability to use directly, and achieve the effects of improving activity and selectivity, being less likely to be poisoned and deactivated, and prolonging life

Active Publication Date: 2013-12-04
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The second technical problem to be solved by the present invention is that in the prior art, coking benzene is refined into pure benzene and used as a raw material, which increases the cost of the raw material. impurity, can not be directly used; and then propose a catalyst that can be used for coking benzene and methanol to synthesize p-xylene and its preparation method

Method used

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  • Catalyst used for synthesis of paraxylene through alkylation reactions between coking benzene and methanol and preparation method thereof
  • Catalyst used for synthesis of paraxylene through alkylation reactions between coking benzene and methanol and preparation method thereof
  • Catalyst used for synthesis of paraxylene through alkylation reactions between coking benzene and methanol and preparation method thereof

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Embodiment 1

[0031] Heat the HZSM-5 molecular sieve with a silicon-aluminum ratio of 300:1 and a particle size of 150nm in high-temperature water vapor at 550°C for 0.5 hours; take 6g of the HZSM-5 molecular sieve after the above treatment, add 0.2g of zinc oxide and 2g After uniform mixing with water, kneading and extruding into rods, drying at 80°C for 6 hours, and calcining at 300°C for 8 hours to obtain Catalyst 1.

Embodiment 2

[0033] Heat the SAPO-11 molecular sieve with a silicon-aluminum ratio of 10:1 and a particle size of 600nm in high-temperature water vapor at 300°C for 4 hours; take 10 g of the above-mentioned treated SAPO-11 molecular sieve and impregnate it in 4mol / L chromium nitrate After 2 hours in a mixed solution composed of magnesium sulfate with 6mol / L, dry at 160°C for 0.5 hour, and roast at 600°C for 2 hours to obtain catalyst 2, wherein the content of SAPO-11 molecular sieve is 76.9wt%, and the content of chromium oxide is 9.2wt%, the content of magnesium oxide is 13.9wt%.

Embodiment 3

[0035] The HZSM-5 molecular sieve with a silicon-aluminum ratio of 350:1 and a particle size of 100 nm was heat-treated in high-temperature water vapor at 400° C. for 3 hours; 5 g of the HZSM-5 molecular sieve after the above-mentioned treatment was added, and 0.5 g of nickel oxide and 2 g of After uniform mixing with water, kneading and extruding into rods, drying at 70°C for 8 hours, and calcining at 120°C for 10 hours to obtain catalyst 3.

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Abstract

The invention discloses a catalyst used for synthesis of paraxylene through alkylation reactions between coking benzene and methanol and a preparation method thereof. The catalyst comprises carriers and active components, the carriers are HZSM-5 molecular sieves or SAPO-11 molecular sieves which have been subjected to a water steam heating treatment, and the active components are metal oxides. The molecular sieves are subjected to a high-temperature water steam heating treatment, thus active centers and acid-base properties of the molecular sieves are evenly distributed, and the acidity of the molecular sieves is reduced, so active components can be evenly loaded on the carriers, the catalyst is not easy to be poisoned or lose activity when the catalyst is catalyzing the alkylation reactions of coking benzene, the conversion rate of the alkylation of coking benzene is increased, and the service life of the catalyst is prolonged at the same time.

Description

technical field [0001] The invention relates to a catalyst used for the alkylation of coked benzene and methanol to synthesize p-xylene and a preparation method thereof, belonging to the technical field of catalysts. Background technique [0002] Para-xylene (PX) is an important basic chemical raw material for aromatic hydrocarbons. After oxidation of para-xylene, terephthalic acid (PTA) can be obtained. Further synthesis of terephthalic acid can obtain important polymers such as polyester fibers and plastics. materials; in addition, p-xylene is also widely used in the fields of medicine, pesticides, dyes and solvents. [0003] In industry, p-xylene is generally produced by separating aromatics from petroleum cracking products, disproportionating toluene or transalkylating heavy aromatics. Because the above-mentioned methods will also synthesize a large amount of benzene while synthesizing p-xylene, and the benzene product The low economic value will affect the economics of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J29/85B01J29/46B01J29/48C07C15/08C07C2/86
CPCY02P20/52
Inventor 任相坤朱志荣崔永君郝志显赵文涛王培吴倩李明
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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