Method for adsorbing and separating paraxylene and ethylbenzene from C8 aromatic components

An adsorption separation and p-xylene technology, applied in the direction of adsorption purification/separation, isomerization hydrocarbon production, organic chemistry, etc., can solve the problems of increased loss of aromatics, low conversion rate of ethylbenzene, harsh operating conditions, etc., to achieve improved Purity and yield, reducing the difficulty of separation, reducing the effect of energy consumption

Active Publication Date: 2015-03-18
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method results in the loss of xylene in the isomerization reaction due to the occurrence of non-target acid-catalyzed transalkylation reactions and cyclocracking reactions
[0010] In the prior art, the raw material for isomerization contains a certain amount of ethylbenzene, and the isomerization can be divided into ethylbenzene deethylation type and ethylbenzene conversion type isomerization according to the different conversion modes of ethylbenzene. base, then C 8 Increased loss of aromatics; if ethylbenzene is converted to xylene, the conversion rate of ethylbenzene is low and the operating conditions are harsh

Method used

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  • Method for adsorbing and separating paraxylene and ethylbenzene from C8 aromatic components
  • Method for adsorbing and separating paraxylene and ethylbenzene from C8 aromatic components
  • Method for adsorbing and separating paraxylene and ethylbenzene from C8 aromatic components

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preparation example Construction

[0032] The preparation method of the above-mentioned isomerization catalyst is as follows: after mixing the zeolite and the binder, adding a peptizer and kneading, extruding, drying and roasting. The peptizer is an inorganic acid, preferably nitric acid. The drying temperature after extruding is 90-120°C, and the roasting temperature is 450-650°C.

[0033] The temperature for the isomerization of o-xylene and m-xylene under non-hydrogenation conditions is 290-350°C, the pressure is 0.2-0.6MPa, and the mass space velocity of the feed is 1-5h -1 .

[0034] The isomerization of the absorbing matter described in the present invention can also be carried out under the condition of facing hydrogen, and the catalyst used for the hydrogen isomerization can further support platinum in the above-mentioned acidic catalyst, and the platinum-loaded catalyst is based on the above-mentioned acidic catalyst. The platinum content calculated as a basis is 0.1 to 1.0% by mass, preferably 0.1 t...

example 1

[0040] Prepare the adsorbent used in liquid phase adsorption separation.

[0041] Mix X zeolite (produced by Shanghai Fuxu Molecular Sieve Co., Ltd.) and kaolin at a mass ratio of 92:8, roll into a ball, and roast at 520°C for 6 hours to take spherical particles with a particle size of 0.15-1.0 mm, and use barium nitrate solution For ion exchange, the liquid / solid volume ratio of the solution to the adsorbent is 10, the concentration of the barium nitrate solution is 0.5 mol / liter, and the exchange degree calculated according to the residual sodium content after the exchange is 95 mol%. After the exchange, the solid was dried at 100°C for 3 hours and activated at 220°C for 2 hours to obtain Adsorbent A, in which the BaX content was 93.41% by mass and the kaolin content was 6.59% by mass.

example 2

[0043] Prepare the adsorbent used in gas phase pressure swing adsorption separation.

[0044] According to the method described in ZL99126289.1, the raw powder of TS-1 molecular sieve with hollow crystal grains was prepared. Mix the TS-1 molecular sieve raw powder with a hollow grain structure and kaolin at a mass ratio of 94:6, roll into balls, take spherical particles with a particle size of 0.5-1.0 mm, dry at 90°C for 4 hours, and bake at 520°C for 6 hours. Adsorbent B was prepared in hours, which contained 94.2% by mass of hollow structure TS-1 molecular sieve and 5.8% by mass of kaolin.

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Abstract

The invention discloses a method for adsorbing and separating paraxylene and ethylbenzene from C8 aromatic components. The method comprises the following steps: performing liquid-phase adsorption and separation on C8 aromatic hydrocarbons, thereby obtaining extracted oil rich in paraxylene and raffinate oil rich in ethylbenzene, m-xylene and o-xylene; introducing the raffinate oil into a gas phase adsorption and separation column, adsorbing ethylbenzene from the raffinate oil under the conditions of 190-270 DEG C, 0.4-0.8MPa and gas phase, allowing the non-adsorbed components to flow out of the gas phase adsorption and separation column to serve as adsorption residues, and purging an adsorbent bed layer by using purge gas under the pressure not less than the adsorption pressure, wherein the purged intermediate components is used as gas phase adsorption feedstock; reducing the pressure to 0.1-0.3 MPa, introducing the purge gas to desorb the adsorbed ethylbenzene so as to obtain the aspirate, performing xylene isomerization on the adsorption residues, wherein the isomerization products are taken as raw materials of the above liquid phase adsorption and separation. According to the method, the high-purity paraxylene and ethylbenzene can be separated from the C8 aromatic components, the adsorption residues hardly contain ethylbenzene, and isomerization can be performed under the non-hydrogen and low-temperature conditions.

Description

technical field [0001] The present invention is a kind of method for adsorbing and separating aromatic hydrocarbon isomers, specifically, is a kind of method from C 8 A method for adsorption and separation of p-xylene and ethylbenzene in aromatic hydrocarbons. Background technique [0002] Both p-xylene and ethylbenzene are important basic chemical raw materials, p-xylene is mainly used to produce purified terephthalic acid (PTA) and dimethyl terephthalate (DMT), and then produce polyester. The purity of p-xylene It is required to be at least 99.5%, preferably greater than 99.7%. Ethylbenzene is mainly used to produce styrene, which is an important monomer of the three major synthetic materials, and is mainly used to produce polystyrene, ABS resin, etc. [0003] In the prior art, the simulated moving bed adsorption separation technology is widely used to produce high-purity p-xylene, and the different selective adsorption capacity of the adsorbent for the various isomers o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/08C07C15/073C07C7/13C07C5/27
Inventor 刘宇兴王德华王辉国郁灼杨彦强
Owner CHINA PETROLEUM & CHEM CORP
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