Preparation method of xylene isomerization catalyst

A catalyst and isomerization technology, used in isomerization for hydrocarbon production, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve the problems of increased coking and increased acid strength, and achieve the effect of improving activity and high achievement rate.

Inactive Publication Date: 2016-05-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the acid strength increases during the reaction, and the coking of the reaction will also increase.

Method used

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  • Preparation method of xylene isomerization catalyst
  • Preparation method of xylene isomerization catalyst
  • Preparation method of xylene isomerization catalyst

Examples

Experimental program
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Effect test

example 1

[0030] (1) Preparation of acid-modified ZSM-5 molecular sieves.

[0031] Take 14 grams of SiO 2 / Al 2 o 3 NaZSM-5 molecular sieve with a molar ratio (silicon-aluminum ratio) of 90 was ion-exchanged at 90°C for 2 hours with 50 ml of ammonium chloride aqueous solution with a concentration of 2% by mass, washed until there was no chloride ion in the washing liquid, and dried at 120°C for 6 hours, and calcined at 550°C for 4 hours to obtain HZSM-5 molecular sieve. Put the HZSM-5 molecular sieve into hydrochloric acid with a concentration of 0.25 mol / liter, soak it at 90°C for 4 hours, the impregnating liquid / solid ratio is 5mL / g, wash the impregnated solid with water until the washing liquid has no chloride ions, and dry at 120°C After 8 hours, an acid-modified molecular sieve was obtained.

[0032] (2) Preparation of catalyst

[0033] Take the above-mentioned acid-modified molecular sieve and 6 grams of alumina and mix well, add 20 milliliters of nitric acid solution with a ...

example 2

[0036] Prepare catalyst by the method for example 1, difference is (1) the concentration of hydrochloric acid used is 1.0 mol / liter, makes catalyst C-4, and wherein platinum content is 0.02 mass %, and carrier contains the acid-modified molecular sieve of 70 mass % and 30% by mass of alumina. The reagents and conditions used for acid modification are listed in Table 1.

example 3

[0038] Prepare catalyst by the method for example 1, difference is (1) step used NaZSM-5 molecular sieve SiO 2 / Al 2 o 3 The molar ratio was 28, and the prepared HZSM-5 molecular sieve was modified by impregnating it with 1.0 mol / L hydrochloric acid at 90° C. for 12 hours. The acid-modified molecular sieve was prepared as a catalyst according to the step method of Example 1 (2) to obtain catalyst C-5, wherein the platinum content was 0.02% by mass, and the carrier contained 70% by mass of acid-modified molecular sieve and 30% by mass of alumina. The reagents and conditions used for acid modification are listed in Table 1, and the catalyst acid distribution measured at different temperatures by pyridine adsorption method is shown in Table 2; 27 The changes of framework aluminum and non-framework aluminum determined by Al NMR are shown in Table 3.

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Abstract

The invention provides a preparation method of a xylene isomerization catalyst. The method comprises the following steps: acid modified ZSM-5 molecular sieve and aluminum oxide are mixed and moulded, drying and calcination are carried out, in order to obtain a carrier, a solution of a platinum containing compound is used for dipping the carrier, drying, calcination and reduction are carried out, and the catalyst is prepared; a preparation method of the acid modified ZSM-5 molecular sieve comprises the following steps: after ammonia exchange, the ZSM-5 molecular sieve is dipped with a hydrochloric acid or nitric acid solution for 2-14 hours, and washing and drying are carried out. The catalyst prepared by the method is used for isomerization reactions of C8 aromatic hydrocarbons, and higher isomerization activity is obtained.

Description

technical field [0001] The invention is a preparation method of a xylene isomerization catalyst, specifically, a preparation method of a xylene isomerization catalyst whose active component is ZSM-5 molecular sieve. Background technique [0002] Paraxylene (PX) is an important chemical raw material, mainly used in the production of terephthalic acid, terephthalic acid diester, phthalic anhydride, and also used in coatings, dyes, pesticides and pharmaceuticals. With the development of these industries, the demand for PX is increasing rapidly. At present, the process technology for increasing the production of PX is mainly xylene isomerization, which is an important means to convert meta-xylene (MX) and o-xylene (OX) with low utilization value into PX. [0003] Through the xylene isomerization reaction, p-xylene in the product reaches or approaches the thermodynamic equilibrium value, and the product is separated to obtain the PX product, and then a small amount of light non-...

Claims

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Application Information

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IPC IPC(8): B01J29/44C07C5/27C07C15/08
CPCY02P20/52
Inventor 康承琳周震寰吴巍
Owner CHINA PETROLEUM & CHEM CORP
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