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Catalyst for reducing alkene content in aromatic hydrocarbon, and a preparation method thereof

A technology for olefin content and catalyst, applied in the field of catalyst and its preparation, can solve the problems of significant loss of aromatics, high equipment requirements, complicated operation process, etc., and achieve the effects of long service life and good reaction performance

Active Publication Date: 2014-07-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst contains noble metal components, which is better for removing olefins in benzene, but for C 6 ~C 8 Aromatics products, the depth of hydrogenation reaction is difficult to fully consider, and the loss of aromatics is more significant
In addition, due to the relatively high reaction pressure and temperature, hydrogen is also required, so the requirements for equipment are relatively high
The catalyst needs to be vulcanized when starting up, and the operation process is cumbersome

Method used

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  • Catalyst for reducing alkene content in aromatic hydrocarbon, and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0032] Preparation of the catalyst of the present invention.

[0033] (1) Preparation of hydrogen molecular sieve

[0034] Get 60 grams of DOSY molecular sieves (produced by Changling Catalyst Branch Company, containing Al 2 o 3 20.6% by mass, SiO 2 63.2% by mass, 4.0% by mass of lanthanum oxide, 8.2% by mass of cerium oxide, P 2 o 5 0.8% by mass, Na 2 (1.03 mass %), add 200 milliliters of concentration and be the ammonium chloride solution of 0.01 gram / ml, carry out ion exchange at 90 DEG C for 6 hours, filter, dry at 120 DEG C for 12 hours after washing the filter cake with water, roast at 550 DEG C for 4 hours, then The ammonium exchange is repeated once to obtain the hydrogen molecular sieve.

[0035] (2) Preparation of catalyst

[0036] Take 50 grams of the above-mentioned hydrogen-type DOSY molecular sieve, 70 grams of pseudoboehmite powder (produced by Sasol Company, brand SB, wherein the alumina content is 75% by mass) and 3 grams of ammonium phosphotungstate ...

example 2

[0038] Prepare the catalyst according to the method of Example 1, except that the ammonium phosphotungstate added is 5 grams, and the catalyst DOC-2 is obtained, which contains 46.5% by mass of DOSY molecular sieve, 48.8% by mass of aluminum oxide, 3.6% by mass of tungsten, made of phosphotungsten 0.05% by mass of phosphorus introduced by ammonium acid.

example 3

[0040] Catalyst is prepared by the method for example 1, and difference is that 50 gram hydrogen type DOSY molecular sieves, 50 gram pseudoboehmite powder, 30 gram sepiolite (containing MgO 22.4 quality %, SiO 2 64.2% by mass, Al 2 o 3 6.84% by mass) and 3 grams of ammonium phosphotungstate were mixed evenly, and after extruding, pelletizing, roasting, steam treatment and reduction, the catalyst DOC-3 was prepared, which contained 41.5% by mass of DOSY molecular sieve and 24.9% by mass of sepiolite , 31.1% by mass of alumina, 1.9% by mass of tungsten, and 0.026% by mass of phosphorus introduced from ammonium phosphotungstate.

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Abstract

The invention relates to a catalyst for reducing alkene content in aromatic hydrocarbon. The catalyst comprises, by mass: 20 to 90% of MCM system molecular sieve or REY molecular sieve, 9.0 to 70% of alumina, and 0.5 to 10% of modified metal. The modified metal is selected from VIB family metals, or zinc, or bismuth. The VIB family metals are in a reduced state. Under a reaction condition without hydrogen, the catalyst contacts an aromatic hydrocarbon material containing alkene impurities. With the catalyst, the alkene content in the material is reduced. The catalyst has high activity and stability, and can be repeatedly recovered.

Description

technical field [0001] The invention relates to a catalyst for reducing olefin impurities in reformed aromatics and a preparation method thereof, in particular to a catalyst for reducing olefins containing molecular sieves and a preparation method thereof. Background technique [0002] The oil produced by catalytic reforming is rich in aromatics and contains a small amount of olefins. To produce qualified aromatics, the olefins must be removed, otherwise the bromine index, corrosion and pickling color of aromatics products are unqualified. Olefins also have an impact on the performance of downstream equipment, adsorbents and catalysts. In addition, olefins are easy to form gums and other by-products, polluting the heat transfer surface of operating equipment, thereby reducing its use efficiency. [0003] The olefins in the reformed oil generally have the following removal methods: the reformed oil is selectively hydrogenated to convert olefins into alkanes; the hydrogenate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/16B01J29/78B01J29/08C07C7/148C07C15/00C10G29/16
Inventor 臧高山马爱增任坚强张大庆陈志祥张玉红王嘉欣
Owner CHINA PETROLEUM & CHEM CORP