Adsorbent for adsorbing and separating m-xylene and preparation method of same

A technology for m-xylene and adsorption separation, applied in the direction of adsorption purification/separation, chemical instruments and methods, and other chemical processes, which can solve the problems of application limitations and low adsorption capacity

Active Publication Date: 2011-08-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the adsorption capacity of zeolites such as Si

Method used

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  • Adsorbent for adsorbing and separating m-xylene and preparation method of same
  • Adsorbent for adsorbing and separating m-xylene and preparation method of same
  • Adsorbent for adsorbing and separating m-xylene and preparation method of same

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preparation example Construction

[0023] The preparation method of adsorbent of the present invention comprises:

[0024] (1) NaY zeolite and kaolin group minerals are mixed and agglomerated into particles, then dried and roasted;

[0025] (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;

[0026] (3) Carry out cation exchange with strontium soluble salt solution, then wash, dry and activate.

[0027] 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 process...

example 1

[0049] Prepare the adsorbent of the present invention and carry out the adsorption performance test.

[0050] (1) Rolling ball molding: 88 kg (mass on dry basis, the same below, produced by Sinopec Catalyst Changling Branch) with a silica / alumina molar ratio of 5.32, an average grain size of 0.8 microns, and a toluene adsorption capacity of 237 mg / The NaY type zeolite of gram is mixed with 9.8 kilograms of kaolin (containing 90 mass % of kaolinite, produced in Linfen, Shanxi Province) and 3.4 kilograms of turnip powder to form a mixed powder, put into a turntable and spray an appropriate amount of water while rolling, so that The solid mixed powder is agglomerated into small balls, and 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...

example 2

[0055] The adsorbent was prepared according to the method of Example 1, except that the concentration of the strontium chloride aqueous solution used in (3) step ion exchange was 0.04moL / L. X-ray fluorescence spectrometry determines that after ion exchange, the adsorbent contains 1.79% by mass of strontium oxide and 11.12% by mass of sodium oxide, and the molar ratio of sodium oxide to strontium oxide is 10.4:1. Dry in a nitrogen stream at 230°C for 2 hours to obtain adsorbent A -2, the ignition loss after roasting at 600°C for 2 hours is 3.1% by mass. The selectivity of the adsorbent, MX half-peak width and net retention volume measured by the pulse test are shown in Table 1.

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Abstract

An adsorbent for adsorbing and separating m-xylene comprises 90-98 wt% of Y zeolite and 2-10 wt% of binder, wherein an exchangeable cation site of the Y zeolite is jointly occupied by a sodion and a strontium ion. With relatively high absorption capacity and absorption selectivity for m-xylene, the absorbent is used for adsorbing and separating m-xylene from C8 aromatic hydrocarbon.

Description

technical field [0001] The invention relates to an adsorbent for adsorbing and separating meta-aromatics and a preparation method thereof, in particular to an adsorbent for adsorbing and separating meta-xylene from C8 aromatics 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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IPC IPC(8): C07C7/13C07C15/08B01J20/18
Inventor 王辉国马剑锋王德华郁灼王志光
Owner CHINA PETROLEUM & CHEM CORP
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