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Method for adsorbing-crystal separation of paraxylene and ethylbenzene from C8 aromatic

A p-xylene, adsorption separation technology, applied in the direction of adsorption purification/separation, crystallization purification/separation, organic chemistry, etc., can solve problems such as xylene crystallization separation that are not mentioned, and achieve the effect of increasing the processing capacity

Active Publication Date: 2007-10-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

The adsorbent used in its adsorption separation is non-acidic medium-porous zeolite, such as high-silica ZSM-5 zeolite, but this method does not mention crystallization and separation of streams rich in p-xylene

Method used

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  • Method for adsorbing-crystal separation of paraxylene and ethylbenzene from C8 aromatic
  • Method for adsorbing-crystal separation of paraxylene and ethylbenzene from C8 aromatic
  • Method for adsorbing-crystal separation of paraxylene and ethylbenzene from C8 aromatic

Examples

Experimental program
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Effect test

example 1

[0030] An adsorbent for separating mixed xylenes used in the present invention was prepared.

[0031] Mix ZSM-5 zeolite (produced by Shanghai Xinnian Petrochemical Auxiliary Co., Ltd.) with a silica / alumina molar ratio of 200 and kaolin at a mass ratio of 90:10, roll into a ball, roast at 500°C for 4 hours, and sieve the pellets The particle diameter is 0.4~0.8 millimeter, obtains adsorbent A.

example 2

[0033] Mix X zeolite (produced by Shanghai Xinnian Petrochemical Auxiliary Co., Ltd.) and kaolin at a mass ratio of 90:10, roll into a ball, bake at 500°C for 4 hours, take spherical particles of 0.4-0.8 mm, and add tetramethoxysilane Cyclohexane solution, the mass ratio of spherical particles: tetramethoxy silicon: A cyclohexane is 1:10:10, stirred and contacted at 25°C for 2 hours, the spherical particles were taken out, dried at 50°C for 4 hours, and dried at 500°C After firing for 4 hours, the silicon oxide content of the spherical particles after silicone treatment increased from 44.6% by mass to 46.2% by mass. Then carry out ion exchange with the mixed solution of barium nitrate and potassium chloride, the liquid / solid volume ratio of solution and spherical particle is 10, and the concentration of barium nitrate and potassium chloride in the solution is respectively 6 mass % and 1 mass %, after exchange The solid was dried at 120°C for 4 hours and activated at 200°C for ...

example 3

[0035] Adsorption and separation of mixed xylenes.

[0036] Use a set of small simulated moving bed equipment, as shown in Figure 2. It is composed of 12 columns connected in series. The cavity containing the adsorbent inside each column is 200mm high and 40mm in diameter. The 12th column is connected to the first column through a pump to circulate the fluid in the column. The connections of each column are uniform. Import and export of materials. The number of adsorption columns required for each stage of adsorption separation is set according to the following method: 3 columns with interval numbers of 8, 9, and 10 between the raw material inlet and the raffinate outlet are the adsorption sections; the raffinate outlet and the desorbent The two columns numbered 11 and 12 between the inlets are the isolation section; the three columns numbered 1, 2, and 3 between the desorbent inlet and the outlet of the extract are the desorption section; the outlet of the extract and the T...

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Abstract

An adsorbing-crystallizing process for separating p-xylene and ethylbenzene from C8 arylhydrocarbon includes such steps as adsorptive separation to obtain the first material flow containing ethylbenzene and p-xylene and the second material flow containing meta-xylene and o-xylene, crystallizing for separating p-xylene from the first material flow, and adsorbing for separating ethylbenzene from the residual mother liquid.

Description

technical field [0001] The present invention is a kind of from C 8 A method for adsorption and separation of p-xylene in aromatic hydrocarbons, specifically, a method from C 8 Adsorption-crystallization separation of p-xylene and ethylbenzene in aromatic hydrocarbons. Background technique [0002] Both p-xylene and ethylbenzene are important chemical raw materials, and p-xylene is mainly used to produce refined terephthalic acid and dimethyl terephthalate, the purity of which is at least 99.5%, preferably greater than 99.7%. The above-mentioned monomers are used in the further production of various polyester products such as polyethylene terephthalate. Ethylbenzene is mainly used for dehydrogenation to produce styrene. Styrene is an important monomer for the synthesis of polymer materials and is mainly used for the preparation of polystyrene. Its purity requirement is greater than 99.7%. [0003] In the prior art, ethylbenzene is mainly produced by the alkylation reaction...

Claims

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Application Information

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IPC IPC(8): C07C7/12C07C7/14C07C15/08C07C15/073
Inventor 王德华王辉国马剑锋张宝贵郁灼
Owner CHINA PETROLEUM & CHEM CORP
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