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Molecular sieve P-IM-5 and its application in toluene alkylation reaction

A technology of IM-5 and toluene alkyl, applied in the field of IM-5 molecular sieves and catalysts prepared from the molecular sieves, can solve the problems of reduced activity, reduced selectivity of xylene, reduced acid strength, etc., to reduce side reactions and improve Effect of Toluene Conversion and Xylene Selectivity

Active Publication Date: 2011-10-05
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, when ZSM-5 molecular sieve is used as the catalyst active component, it has the following disadvantages: the acidic sites on the outer surface of ZSM-5 molecular sieve perform non-selective isomerization of the para-rich products diffused from the pores; disproportionation, xylene Side reactions such as alkylation with methanol produce components such as benzene, ethylbenzene and carbon nine, which reduce the selectivity of xylene, and the conversion rate of toluene is only 28-35%.
The reduction of acid strength can effectively inhibit the occurrence of side reactions such as toluene disproportionation, and increase the yield of xylene. Correspondingly, the yield of p-xylene also increases, but the activity is significantly reduced.

Method used

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  • Molecular sieve P-IM-5 and its application in toluene alkylation reaction
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preparation example Construction

[0017] The preparation method of P-IM-5 described in the present invention is: introducing phosphorus element in the molecular sieve preparation process for modification, and the phosphorus-containing compound is selected from phosphoric acid, ammonium phosphate, ammonium hydrogen phosphate, ammonium dihydrogen phosphate, three Phenylphosphonium, Trimethyl Phosphate. The method of introducing can be dipping method, mechanical mixing method, preferably dipping method. During impregnation, the liquid / solid ratio of the phosphorus-containing compound solution to the H-IM-5 molecular sieve is 1-8ml / g, preferably 3-6ml / g, the impregnation time is 1-4 hours, and the impregnation temperature is 60-85°C. After impregnation, the solid is dried at 90-120°C and calcined at 450-550°C to obtain P-IM-5 molecular sieve.

[0018] The method for preparing the catalyst of the present invention is as follows: thoroughly mix and knead the P-IM-5 molecular sieve and the precursor of the binder, t...

example 1

[0023] Prepare the P-IM-5 molecular sieve of the present invention.

[0024] (1) Preparation of H-IM-5 molecular sieve

[0025] SiO 2 / Al 2 o 3 NaIM-5 molecular sieve with a molar ratio of 48.4 was ion-exchanged with ammonium nitrate solution with a concentration of 0.5 mol / L at 80° C. for 3 times, each time for 2 hours. The molecular sieve obtained after the exchange was washed with deionized water, dried at 90°C for 24 hours, and calcined at 500°C for 5 hours to obtain H-IM-5 molecular sieve z 1 , whose Na 2 The O content is less than 0.1% by mass.

[0026] (2) Preparation of P-IM-5 molecular sieve

[0027] The above-mentioned H-IM-5 molecular sieve was impregnated with ammonium dihydrogen phosphate solution with a concentration of 0.2mol / L at a liquid / solid ratio of 3.52ml / g at 80°C for two hours, dried at 90°C for 24 hours, and calcined at 500°C for 4 hours , to prepare phosphorus-modified P-IM-5 molecular sieve z 2 , whose P 2 o 5 The content is 5.0% by mass.

example 2

[0029] Prepare the P-IM-5 molecular sieve by the method for example 1, difference is that (2) step is impregnated with the ammonium dihydrogen phosphate solution of 0.2mol / L with the liquid / solid ratio of 4.23ml / g 1 Molecular sieve, P-IM-5 molecular sieve obtained after drying and roasting 3 , whose P 2 o 5 The content is 6.0% by mass.

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Abstract

The invention provides a phosphorus modified molecular sieve P-IM-5 for a toluene alkylation reaction, the content of phosphorus is 5-9 wt% measured as P2O5, the phosphorus modified molecular sieve P-IM-5 is used as a catalyst of active component. The molecular sieve P-IM-5 can minimize the auxiliary reaction in the toluene alkylation reaction and allow selectivity of xylene to reach to 100%, with high toluene conversion rate.

Description

technical field [0001] The present invention relates to a phosphorus-modified molecular sieve and a catalyst prepared from the molecular sieve, and the application of the catalyst in toluene alkylation reaction, specifically, a phosphorus-modified IM-5 molecular sieve and the molecular sieve prepared from the molecular sieve The prepared catalyst, and the application of the catalyst in the methanol methylation reaction of toluene. Background technique [0002] The industrial application value of methylation reaction of toluene and methanol is very high. It can generate xylene through alkylation reaction of cheap toluene and methanol, especially the important basic organic raw material - p-xylene. [0003] In the 1970s, Mobil Corporation of the United States developed the ZSM-5 shape-selective molecular sieve. Because the ZSM-5 molecular sieve has good thermal stability and hydrothermal stability, and the diameter of the channel is close to the size of the p-xylene molecule, ...

Claims

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Application Information

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IPC IPC(8): C07C15/08C07C2/88B01J29/70
CPCY02P20/52
Inventor 张超陈强王永睿孙敏慕旭宏舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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