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Catalyst for removing olefin in reformed arene and preparation method thereof

A catalyst and aromatic technology, 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 good reaction performance, long service life and extended operation period

Active Publication Date: 2013-03-06
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 removing olefin in reformed arene and preparation method thereof
  • Catalyst for removing olefin in reformed arene and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0019] The preparation method of the catalyst of the present invention comprises fully mixing MCM series molecular sieves and modified Y molecular sieves, then adding kale powder and dilute acid solution and kneading, or adding carboxymethyl cellulose or methyl cellulose solution and kneading, and then extrusion molding, Dry and roast.

[0020] In the above method, extrusion aids need to be added to molecular sieve molding, and the extrusion aids can be safflower powder and dilute acid solution, or carboxymethyl cellulose or methyl cellulose solution. The acid is preferably nitric acid, acetic acid, citric acid or a mixture of any two or three of them.

[0021] To prepare a catalyst containing alumina and / or sepiolite, aluminum hydroxide powder and / or sepiolite need to be added to MCM series molecular sieves and modified Y molecular sieves for mixing, and then kneaded and extruded.

[0022] When using safflower powder and dilute acid solution for molding, the mass ratio of sq...

example 1

[0029] Preparation of the catalyst of the present invention.

[0030] Get 50 grams of DOSY molecular sieves (produced by Changling Catalyst Branch Company, containing Al 2 o 3 21.3% by mass, SiO 2 57.3% by mass, 4.5% by mass of lanthanum oxide, 8.5% by mass of cerium oxide, Na2 O 0.06 mass %) and 50 grams of MCM-22 molecular sieves (produced by Shanghai Excellence Chemical Technology Co., Ltd., the silica / alumina mol ratio is 45, Na 2 O content is 0.08% by mass) and fully mixed, according to the mass ratio of mixed molecular sieve powder: turmeric powder: nitric acid: acetic acid: citric acid: water=50: 1: 2: 3: 3: 40 and kneaded evenly, then extruded strips, Cut into pellets, dry at 120° C. for 12 hours, and bake at 550° C. for 4 hours to obtain a bar-shaped catalyst DOC-1, which contains 50% by mass of DOSY molecular sieve and 50% by mass of MCM-22 molecular sieve.

example 2

[0032] Prepare the catalyst according to the method of Example 1, except that the mixed molecular sieve powder and 5% by mass sodium carboxymethylcellulose solution are mixed and kneaded evenly at a mass ratio of 5:3, then extruded, pelletized, and dried at 120°C for 12 hours , Roasted at 550° C. for 4 hours to prepare strip catalyst DOC-2, which contains 50% by mass of DOSY molecular sieve and 50% by mass of MCM-22 molecular sieve.

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Abstract

The invention relates to a catalyst for removing olefin in reformed arene. The catalyst comprises the following components in percentage by weight: 20-80 percent of MCM series molecular sieve and 20-80 percent of modified REY molecular sieve, wherein the REY molecular sieves are DOSY or CDY; the DOSY is the REY of phosphorus-containing amorphous silicon oxide, in the 31P MAS NMS spectrum of the DOSY, the chemical shift is the sum of the peak areas of a -15+ / -2ppm peak and a -23+ / -2ppm peak, and the specific value of the peak area sum to a total peak area is larger than 85 percent; the CDY is an REY, and metered by rare earth oxide, the content of rare earth is 12-22 weight percent; and rare earth ions are all in a molecular sieve cellule, and non-framework aluminum does not exist. The catalyst is used for removing olefin in reformed generated oil and has better olefin removal activity and stability.

Description

technical field [0001] The invention relates to a catalyst for removing olefins in reforming aromatic hydrocarbons and a preparation method thereof, in particular to a catalyst for removing 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. Therefore, it is of great practical significance to develop a technology for removing trace olefins in reformed mixed aromatics. [0003] The olefins in the reformed oil are ge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/80
Inventor 臧高山马爱增张大庆陈志祥张玉红王嘉欣
Owner CHINA PETROLEUM & CHEM CORP