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Catalyst for toluene alkylation reaction, and preparation method thereof

A technology of toluene alkyl and catalyst, which is applied in the field of catalyst and its preparation, can solve the problems of low conversion rate of toluene, etc., and achieve the effects of prolonged reaction life, enhanced activity stability, and improved selectivity

Active Publication Date: 2012-02-01
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] CN85102764A discloses the preparation and application of a rare earth modified zeolite catalyst. The ZSM-5 molecular sieve is first modified with phosphorus and then modified with rare earth. Excellent p-xylene selectivity but low toluene conversion

Method used

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  • Catalyst for toluene alkylation reaction, and preparation method thereof
  • Catalyst for toluene alkylation reaction, and preparation method thereof

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preparation example Construction

[0017] The preparation method of the catalyst provided by the invention comprises the steps of mixing the P-ZSM-5 / Silicalite-1 composite molecular sieve and the Silicalite-1 molecular sieve which are loaded with rare earth elements on the outer layer and forming them.

[0018] The preparation method of the preferred catalyst provided by the present invention includes uniformly mixing the P-ZSM-5 / Silicalite-1 composite molecular sieve, the Silicalite-1 molecular sieve and the precursor of the binder, which are loaded with rare earth elements on the outer layer, and then forming, drying and roasting.

[0019] The precursor of the binder is pseudo-boehmite or silica sol.

[0020] The preparation method of the P-ZSM-5 / Silicalite-1 composite molecular sieve of the outer layer loading rare earth elements comprises the following steps:

[0021] (1) impregnating the HZSM-5 molecular sieve with a phosphorus-containing compound solution, drying and roasting to obtain P-ZSM-5,

[0022] ...

example 1

[0035] The following example prepares the composite molecular sieve of the present invention.

[0036] (1) Take 15 grams of SiO 2 / Al 2 o 3 For HZSM-5 molecular sieve with a molar ratio of 42, use 20ml of an aqueous solution containing 1.929 grams of ammonium dihydrogen phosphate, impregnate at 25°C for 8 hours, dry at 120°C for 4 hours, and roast at 550°C for 3 hours to obtain phosphorus-modified ZSM-5 molecular sieve P-ZSM-5.

[0037] (2) Combine P-ZSM-5 with 8.67g tetraethyl orthosilicate (produced by Beijing Chemical Reagent Company, SiO 2 content 28% by mass), 5.38g tetrapropylammonium bromide (Guangzhou Dayou Fine Chemical Factory) mixed with 20ml aqueous solution, placed in a polytetrafluoroethylene-lined crystallization kettle, 150 DEG C of static crystallization for 20 hours, Cool to 25°C, dry at 120°C for 4 hours, and bake at 550°C for 3 hours to obtain a composite molecular sieve whose inner layer is P-ZSM-5 and outer layer is Silicalite-1.

[0038] (3) The com...

example 2

[0041] Catalyst was prepared according to the method of Example 1, except that (4) step mixed uniformly with 3 grams of modified composite molecular sieve A and 17 grams of pure silicon ZSM-5 molecular sieve Silicalite-1, and tableted to obtain catalyst H.

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Abstract

The invention relates to a toluene alkylation reaction catalyst comprising components of, by mass: 10 to 70% of P-ZSM-5 / Silicalite-1 composite molecular sieve with rare earth elements loaded on the outer layer, and 30 to 90% of Silicalite-1 molecular sieve. The P-ZSM-5 / Silicalite-1 composite molecular sieve comprises, by mass: 3.0 to 21.0% of phosphorus expressed by phosphoric anhydride, and 1.0 to 9.0% of rare earth expressed by rare earth oxide. When the catalyst is used in the alkylation reaction between toluene with methanol, the activity stability is improved, the selectivity upon xyleneproducts is high, and the reaction life of the catalyst is prolonged.

Description

technical field [0001] The invention relates to a catalyst used for the alkylation reaction of toluene methanol and its preparation method and application, in particular to a catalyst containing composite molecular sieves and its preparation method. Background technique [0002] Alkylation of toluene with methanol can produce p-xylene with high selectivity, avoid the use of expensive and complicated adsorption separation technology, and has the advantages of abundant raw material sources, mild reaction conditions, and less by-products, so this reaction has attracted worldwide attention. Great attention of big chemical companies. [0003] In the 1970s, Mobil Corporation of the United States developed ZSM-5 shape-selective molecular sieve. Because ZSM-5 molecular sieve has good thermal stability and hydrothermal stability, the diameter of the channel is close to the size of p-xylene, which is beneficial to the diffusion of p-xylene , so it is possible to prepare p-xylene by a...

Claims

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Application Information

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IPC IPC(8): B01J29/40B01J29/035C07C15/08C07C2/88
CPCY02P20/52
Inventor 孙敏王永睿王萍慕旭宏舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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