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Catalyst for alkylation of toluene with methanol to produce paraxylene with coproduction of ethylene and application thereof

A technology of paraxylene and catalyst is applied in the field of catalysts for the co-production of ethylene from paraxylene with high selectivity by alkylation of toluene with methanol, which can solve the problem that the downstream application requirements of polyester cannot be met, the selectivity of PX and ethylene cannot have both, and the ethylene /The problem of low proportion of propylene

Inactive Publication Date: 2014-11-05
陕西煤化工技术工程中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It can be seen from this that in the prior art, the co-production of low-carbon olefins (propylene + ethylene) is mainly based on the production of PX. The content of propylene in low-carbon olefins is too high, and the ratio of ethylene / propylene is not high. There is a choice of PX Due to the incompatibility of the selectivity of sex and ethylene, it cannot meet the downstream application requirements of polyester with p-xylene and ethylene as raw materials

Method used

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  • Catalyst for alkylation of toluene with methanol to produce paraxylene with coproduction of ethylene and application thereof
  • Catalyst for alkylation of toluene with methanol to produce paraxylene with coproduction of ethylene and application thereof

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Effect test

Embodiment 1

[0023] The desalinated water, ZSM-5 molecular sieve, matrix material and binder are mixed, sprayed and formed, and then calcined to obtain the original powder of the fluidized bed catalyst. Then, impregnating, drying, and calcining the original catalyst powder by using an aqueous solution of a phosphorus compound; and then impregnating, drying, and calcining an alkoxy compound anhydrous ethanol solution to obtain a catalyst. The weight percentage of ZSM-5 molecular sieve in the fluidized bed catalyst is 20%, and SiO in the ZSM-5 molecular sieve 2 with Al 2 o 3 The molar ratio of the matrix material is 200:1; the weight percentage of the matrix material is 50%, and the matrix material is kaolin; the weight percentage of the binder is 5%, and the binder is silica sol; the weight percentage of the phosphorus element is 10%, And the phosphorus-containing compound is phosphoric acid; the percentage by weight of the silicon element after the siloxane compound is impregnated in the...

Embodiment 2

[0025] The desalinated water, ZSM-5 molecular sieve, matrix material and binder are mixed, sprayed and formed, and then calcined to obtain the original powder of the fluidized bed catalyst. Then, the original catalyst powder is impregnated, dried, and calcined with an aqueous solution of a lanthanum compound; and then impregnated, dried, and calcined with an alkoxy compound anhydrous ethanol solution to obtain a catalyst. The weight percent of ZSM-5 molecular sieve is 40% in the fluidized bed catalyst, and SiO in the ZSM-5 molecular sieve 2 with Al 2 o 3 The molar ratio of the matrix material is 150:1; the weight percentage of the matrix material is 20%, and the matrix material is montmorillonite; the weight percentage of the binder is 25%, and the binder is silica sol; the weight percentage of the lanthanum element is 10 %, and the lanthanum-containing compound is lanthanum nitrate; the percentage by weight of silicon after impregnating the siloxane compound absolute ethano...

Embodiment 3

[0027] The desalinated water, ZSM-5 molecular sieve, matrix material and binder are mixed, sprayed and formed, and then calcined to obtain the original powder of the fluidized bed catalyst. Then use alkoxy compound absolute ethanol solution to impregnate, dry, and roast; then use magnesium compound aqueous solution to impregnate, dry, and roast to obtain the catalyst. The weight percentage of ZSM-5 molecular sieve in the fluidized bed catalyst is 70%, and ZSM-5 molecular sieve Medium SiO 2 with Al 2 o 3 The molar ratio of the matrix material is 20:1; the weight percentage of the matrix material is 20%, and the matrix material is silicon oxide; the weight percentage of the binder is 5%, and the binder is a mixture of silica sol and aluminum sol; siloxane The percentage by weight of silicon after impregnating the absolute ethanol solution of the compound is 0.01%, and the siloxane compound is phenylmethyl polysiloxane; the percentage by weight of magnesium element is 4.99%, an...

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Abstract

The invention discloses a catalyst for alkylation of toluene with methanol to produce paraxylene with coproduction of ethylene and application thereof. The catalyst is prepared by modifying zeolite molecular sieve with alkaline earth metal, non-metallic or / and rare earth metal and modifying surface acidity and pore structure by a siloxane compound. The invention aims at the characteristics of the two raw materials paraxylene and ethylene for polyester production, and uses one catalyst for high selectivity production of paraxylene and ethylene at the same time; and the catalyst can be used for industrial shape selective alkylation of toluene with methanol to produce paraxylene, and further can be used in industrial production of polyester.

Description

technical field [0001] The invention belongs to the technical field of chemical catalysts, and relates to a catalyst for producing p-xylene and co-producing ethylene, in particular to a catalyst for producing p-xylene and co-producing ethylene with high selectivity through alkylation of toluene and methanol and its application. Background technique [0002] Polyethylene terephthalate, referred to as polyester (PET), was invented in 1944 and was first industrialized in the UK in 1949. Polyester has rapidly evolved into the most productive variety among synthetic fibers due to its excellent wearability and high strength. Before the 1970s, polyester had maintained a high-speed development trend in developed countries such as Europe and the United States; after the 1990s, the development focus of the polyester industry gradually shifted to Asia, and the polyester industry ushered in a new stage of development. After entering the 21st century, with the rapid development of chemi...

Claims

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Application Information

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IPC IPC(8): B01J29/40C07C2/86C07C1/20C07C11/04C07C11/06C07C15/08
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 张世刚汪彩彩辛玉兵张军民闵小建刘建斌陈亚妮
Owner 陕西煤化工技术工程中心有限公司
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