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Adsorbent for adsorption separation of m-Xylene and preparation method thereof

A technology for m-xylene and adsorption separation, which is applied in the direction of adsorption purification/separation, chemical instruments and methods, and other chemical processes. It can solve the problems of application limitations, low adsorption capacity, etc., and achieve high mass transfer speed and improved elution speed. , the effect of reducing dosage

Active Publication Date: 2010-06-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adsorption capacity of zeolites such as Silicalite-1 and β is low, which limits their application.

Method used

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  • Adsorbent for adsorption separation of m-Xylene and preparation method thereof
  • Adsorbent for adsorption separation of m-Xylene and preparation method thereof
  • Adsorbent for adsorption separation of m-Xylene and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0020] The preparation method of adsorbent provided by the invention comprises:

[0021] (1) NaY zeolite and kaolin group minerals are mixed and agglomerated into particles, then dried and roasted;

[0022] (2) Treat the calcined particles with sodium hydroxide solution or a mixed solution of sodium hydroxide and sodium silicate at 90-100° C., so that the kaolin group minerals therein are in-situ crystallized into Y zeolite;

[0023] (3) Carry out cation exchange with copper or silver soluble salt solution, then wash, dry and activate.

[0024] In the above preparation method, step (1) is the coalescence molding of NaY zeolite and kaolin group minerals, and the mass ratio of zeolite and kaolin group minerals used in molding is 85-95:5-15. The coalescing molding can be carried out according to various techniques well known to those skilled in the art, such as extruding, pressing or rolling into balls. From the consideration of the hydrodynamics of the adsorbent filling and use...

example 1

[0043] Prepare the adsorbent of the present invention and carry out the adsorption performance test.

[0044] (1) Rolling ball molding: NaY-type zeolite (mass on a dry basis, the same below, Sinopec Catalyst Changling Branch Company) and 9.8 kilograms of kaolin (containing 90% by mass of kaolinite, produced in Linfen, Shanxi Province) and 3.4 kilograms of celadon powder are mixed uniformly to form a mixed powder, put into a turntable and spray an appropriate amount of water while rolling, To agglomerate the solid mixed powder into pellets, the amount of water sprayed into when rolling the ball is 25% by mass of the solid mixed powder. The pellets with a diameter of 0.35 to 0.80 mm were sieved, dried at 80°C for 10 hours, and roasted at 540°C for 4 hours in an air stream. The toluene adsorption capacity was determined to be 211 mg / g.

[0045] (2) Alkali treatment: The above-mentioned calcined pellets are treated with a 1.0moL / L sodium hydroxide solution at a liquid / solid volum...

example 2

[0049] Prepare sorbent by the method for example 1, difference is (3) the concentration of the used silver nitrate aqueous solution of step ion exchange is 0.05moL / L, after X-ray fluorescence spectrometry measures ion exchange, contains silver oxide 4.31 mass %, Sodium oxide is 11.67% by mass, and the degree of exchange of sodium ions in the adsorbent by silver ions is 9.0%. Adsorbent A-2 was obtained after activation at 230°C, and the ignition loss was 3.2% by mass when roasted at 600°C for 2 hours.

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Abstract

The invention discloses an adsorbent for adsorption separation of m-Xylene, which comprises 90 to 98 percent of Y zeolite by weight and 2 to 10 percent of binder by weight, wherein the exchangeable cathion position of the Y zeolite is occupied commonly by metal ions of IA group and copper or silver ions. The adsorbent has better selectivity of the m-Xylene and better mass transfer rate, and can reduce the usage of strippant.

Description

technical field [0001] The invention is an adsorbent for adsorbing and separating meta-aromatics and a preparation method thereof, specifically, a 8 An adsorbent for adsorbing and separating m-xylene from aromatic hydrocarbons and a preparation method thereof. Background technique [0002] Meta-xylene (MX) is an important basic organic chemical raw material, which is widely used in many fields such as synthetic resin, pesticide, medicine, coating and dyestuff. High-purity m-xylene is usually isolated from mixed C8 aromatics containing ethylbenzene, p-xylene, m-xylene and ortho-xylene. Since the boiling points of the four C8 arene isomers are similar, it is difficult to separate them by conventional distillation methods. Therefore, the separation process of m-xylene mainly includes sulfonation hydrolysis, complexation separation, extraction distillation and adsorption separation. form. Among them, the sulfonation hydrolysis process discharges a large amount of waste acid t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01J20/30C07C7/13C07C15/08
Inventor 王辉国马剑锋王德华郁灼
Owner CHINA PETROLEUM & CHEM CORP
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