Sulfuration modification method of xylene isomerization catalyst

A catalyst and isomerization technology, applied in catalyst activation/preparation, physical/chemical process catalyst, isomerization hydrocarbon production, etc., can solve problems such as sulfur poisoning and achieve high yield effect

Active Publication Date: 2015-02-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sulfurization technology is also used in the reforming process. Sulfur has a certain passivation effect on noble metal

Method used

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  • Sulfuration modification method of xylene isomerization catalyst

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example 1

[0045] The following examples prepare catalysts according to the method of the present invention.

[0046] Take 10 grams of SiO 2 / Al 2 o 3 ZSM-5 molecular sieve powder with a molar ratio of 20 was thoroughly mixed with 10 grams of alumina (Condea company, C1 powder). Add 20 ml of nitric acid aqueous solution with a concentration of 3% by mass, knead, and extrude. Dry the strips at 120°C for 6 hours, cut into pellets, and bake at 550°C for 4 hours. Ion exchange was carried out at 90° C. for 2 hours with 50 ml of aqueous ammonium chloride solution having a concentration of 2% by mass, and the mother liquor was washed until there was no chloride ion in the mother liquor. Immerse in 20 grams of carbon disulfide at 25°C for 8 hours to carry out liquid phase modification. After the impregnation, drain the carbon disulfide, dry at 120°C for 8 hours, and roast in air at 500°C for 2 hours. Then use 20 ml of chloroplatinic acid aqueous solution containing 0.004 g of platinum to im...

example 2

[0048] Prepare catalyst by the method for example 1, difference is to get SiO 2 / Al 2 o 3 16 grams of ZSM-5 molecular sieve with a molar ratio of 200 and 4 grams of alumina were mixed and formed. After ammonium exchange, they were immersed in 40 grams of dimethyl disulfide at 25°C for 48 hours for liquid-phase sulfur modification. After the impregnation, Drain dimethyl disulfide, dry at 120°C for 24 hours, and roast in air at 280°C for 12 hours. Use 20 milliliters of chloroplatinic acid aqueous solution containing 0.1 grams of platinum as the impregnation solution to impregnate the platinum primer, dry, roast and reduce to obtain the catalyst CL-2, which has a platinum content of 0.5% by mass and a sulfur content of 0.5% by mass.

example 3

[0050] Prepare catalyst by the method for example 1, difference is to get SiO 2 / Al 2 o 3 12 grams of ZSM-5 molecular sieves with a molar ratio of 60 and 8 grams of aluminum oxide are mixed and formed, and the catalyst after reduction is carried out gas-phase sulfur modification in hydrogen, and dipropyl trisulfide is passed into hydrogen during gas-phase sulfur modification, so that Hydrogen contains 1 mass% sulfur, at 280°C, 2.0MPa, hydrogen passing through space velocity for 5h -1 Carry out under the condition of 8 hours, obtain catalyst CG-3, and its platinum content is 0.05 mass %, and sulfur content is 0.05 mass %.

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Abstract

A sulfuration modification method of a xylene isomerization catalyst includes the following steps: uniformly mixing a ZSM-5 molecular sieve with a binder, forming, drying, roasting, carrying out ammonium exchange, dipping the obtained substance in a platinum-containing compound solution, drying, roasting, reducing, and carrying out gas phase sulfuration on the obtained roasted substance by a sulfur-containing compound in the presence of hydrogen. A xylene isomerization catalyst modified by the sulfur-containing compound through the method can be used in a xylene isomerization reaction, can inhibit disproportionation side reactions, and can realize high yield of xylene.

Description

technical field [0001] The invention relates to a modification method of a xylene isomerization catalyst, in particular to a vulcanization modification method of a xylene isomerization catalyst. 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 m-xylene and o-xylene 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 can be separated from the PX product through the separation device, and then a small amount of light non-aroma...

Claims

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Application Information

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IPC IPC(8): B01J29/44B01J37/20C07C15/08C07C5/27
CPCY02P20/52
Inventor 周震寰吴巍顾昊辉刘中勋钟进阮迟
Owner CHINA PETROLEUM & CHEM CORP
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