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Preparation method of m-xylene adsorbent

A m-xylene and adsorbent technology, which is applied in the field of m-xylene adsorbent preparation, can solve the problems of poor particle compressive strength, achieve high compressive strength, increase processing capacity, and prolong operating cycle

Active Publication Date: 2020-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, in the rolling forming process, the powder materials contact and adhere to each other to make the particles agglomerate and become larger. During the agglomeration process, the particles are always in contact with the powder materials of the same composition to make the inside and outside uniform, but the compressive strength of the particles obtained in this way is relatively low. Difference

Method used

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  • Preparation method of m-xylene adsorbent
  • Preparation method of m-xylene adsorbent
  • Preparation method of m-xylene adsorbent

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0037] (1) Rolling ball forming

[0038] NaY zeolite and kaolin are mixed evenly according to the mass ratio of 95:5 to obtain the initial molding powder. The silica / alumina molar ratio of the NaY zeolite (toluene adsorption capacity is 234 mg / g) is 4.8, and the grain size is 1.0 to 1.5 microns, the average particle size of kaolin is 57 microns, which contains 80% by mass of kaolinite and 10% by mass of halloysite. Put the initial molding powder into the turntable and spray 10% of the powder while rolling. The mass % deionized water makes the powder aggregate into small balls for initial rolling ball forming. After the initial molding powder is all formed into balls, add the later molding powder to the rolling plate for later rolling ball molding. The later molding powder is composed of 16% by mass of kaolin and 84% by mass of NaY zeolite, during which the amount of water sprayed is 13% by mass of the molding powder; the late molding powder used is 4% of the mass of the initi...

example 2

[0043] The adsorbent was prepared according to the method of Example 1, except that the post-molding powder used was composed of 35% by mass of kaolin and 65% by mass of NaY zeolite. The composition and properties of the obtained adsorbent B are shown in Table 1.

example 3

[0045] The adsorbent was prepared according to the method of Example 1, except that the post-molding powder used was composed of 95% by mass of kaolin and 5% by mass of NaY zeolite. The composition and properties of the obtained adsorbent C were shown in Table 1.

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Abstract

The invention discloses a preparation method of an m-xylene adsorbent. The method comprises the following steps: (1) uniformly mixing Y zeolite and kaolin to obtain initial molding powder, wherein thekaolin content is 1-10% by mass; putting the initial molding powder into rolling forming equipment; spraying water while rolling until all the powder is gathered into pellets so as to obtain initially-formed pellets; and (2) spraying water on the initially-formed pellets prepared in the step (1) while adding later-stage molding powder for later-stage ball rolling molding, wherein the later-stagemolding powder consists of 11-100 mass percent of kaolin and 0-89 mass percent of Y zeolite; drying the molded pellets, roasting at the temperature of 500-700 DEG C, treating with an alkaline solutionfor in-situ crystallization, and drying. The adsorbent prepared by the method has high compressive strength and burning bulk density, good adsorption selectivity and good mass transfer performance.

Description

technical field [0001] The present invention relates to a kind of preparation method of m-xylene adsorbent, specifically, is a kind of from mixing C 8 A method for preparing an adsorbent for adsorbing and separating m-xylene from aromatic hydrocarbons. Background technique [0002] Meta-xylene (MX) is an important basic organic chemical raw material, widely used in synthetic resins, pesticides, medicines, paints and dyes and other fields. mix C 8 Aromatic hydrocarbons include four isomers of p-xylene (PX), m-xylene (MX), o-xylene (OX) and ethylbenzene (EB), and their boiling point difference is very small, especially p-xylene and m-xylene 0.6°C, industrially generally adopts the adsorption separation method to produce high-purity m-xylene. Adsorption separation technology consists of zeolite adsorbent combined with simulated moving bed continuous countercurrent separation process, the core of which is the development and application of high-efficiency adsorbents. In the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01J20/30C07C7/13C07C15/08
CPCB01J20/12B01J20/18C07C7/13B01J2220/42B01J2220/4806C07C15/08
Inventor 高宁宁王辉国王德华马剑锋王红超杨彦强刘宇斯乔晓菲
Owner CHINA PETROLEUM & CHEM CORP
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