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Adsorbent for adsorption stripping dimethyl benzene and its preparing process

A p-xylene, adsorption separation technology, applied in the direction of adsorption purification/separation, crystallization purification/separation, chemical instruments and methods, etc., can solve the problem of low mass transfer efficiency of xylene isomers

Inactive Publication Date: 2003-10-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, those used in the prior art are all zeolite X prepared by conventional methods, and the grain size is about 2.5 microns. The larger grain size makes the mass transfer efficiency of xylene isomers in the zeolite crystals lower.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0012] The preparation method of the adsorbent provided by the present invention comprises rolling molding NaX zeolite with a grain size of 0.5-1.0 microns and a binder into pellets, calcining at 400-600°C, and then using barium soluble salt solution or potassium Cation exchange with a soluble salt solution of barium, followed by drying. The drying temperature is 80-120° C., and the drying time is 6-12 hours.

[0013] The adsorbent is prepared by roll forming method, that is, after NaX zeolite and binder powder are mixed evenly, an appropriate amount of water is sprayed on the turntable while rotating, so that the powder is formed into small balls. The amount of water sprayed is 10-20% of the total amount of powder. The formed pellets are collected, dried and then calcined. The drying temperature is 80-120° C., and the drying time is 6-12 hours. The calcination temperature is preferably 520-560, and the time is preferably 2-6 hours.

[0014] The material after above-mentio...

example 1

[0037] Preparation of small crystal X zeolites.

[0038] In 264 ml of water glass (Na 2 O1.384 mol / L, SiO 2 4.644 mol / liter, specific gravity 1.278 kilogram / liter), add 155 milliliters of high alkali sodium metaaluminate solutions (Na 2 O5.226 mol / L, Al 2 o 3 0.529 mol / liter, specific gravity 1.310 kilogram / liter), 28 milliliters of NaOH solution (NaOH 2 (5.306 mol / liter, specific gravity 1.335 kg / liter) and 28 milliliters of water, after stirring uniformly at a speed of 350 rpm, leave it to stand at 10° C. for aging for 18 hours to obtain the directing agent.

[0039] At 5°C, add 374 ml of low-alkali sodium metaaluminate solution (Na 2 O2.581 mol / L, Al 2 o 3 0.9584 mol / L, specific gravity 1.264 kg / L), then add 214 ml of the directing agent prepared in step (1) and 513 ml of water, stir at 350 rpm for 0.5 hour, heat up to 100°C, and statically crystallize for 10 hours . The product was washed with water until the pH value of the washing solution was less than 10, filt...

example 2

[0041] Zeolite X was prepared according to the method of Example 1, except that the aging temperature of the directing agent was 5°C for 6 hours, and the low-alkali sodium metaaluminate solution was added to the water glass at 10°C. The grain size and physical and chemical properties of the prepared zeolite are shown in Table 1. The relative crystallinity was 98% after calcination at 540°C for 4 hours.

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Abstract

The adsorbent for adsorbing and separating paraxylene includes active adsorbing component in mass fraction 85-95 % and adhesive in mass fraction 5-15 %. The active adsorbing component is selected from BaX zeolite and BaKX zeolite, and the adhesive is selected from kaolin, silica and alumina, with the crystal grain size of X zeolite in the adsorbent being 0.5-1.0 micron. The adsorbent is suitable for adsorption and separation of paraxylene from C8 arene and has high adsorption selectivity.

Description

technical field [0001] The present invention is a C 8 Adsorbent and preparation method for the adsorption and separation of aromatics, specifically, a 8 In the mixture of aromatic hydrocarbons, an adsorbent for selective adsorption and separation of p-xylene by molecular sieve liquid phase and a preparation method thereof. Background technique [0002] For isomers with similar boiling points and similar physical properties, such as C 8 For aromatic hydrocarbons, the isomers are generally separated by adsorption separation. Some crystalline aluminosilicates are exchanged with cations to change the electrochemical properties of their crystals, or to adjust the pH, and can be used as adsorbents for adsorption and separation of isomers. A typical example is X or Y zeolite through Ba ++ 、K + Cation exchange separates p-xylene therefrom. For example, USP3626020, USP3686342, USP3734974 and USP3997620 of Neuzil, USP3665046 of De Rosset, USP3668266 of Chen, USP3700744 of Berger...

Claims

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Application Information

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IPC IPC(8): B01J20/18C07C7/13C07C7/14C07C15/08
Inventor 赵毓璋郁灼于永军王辉国姚志龙陈素华谷德英张宝贵杨会荣
Owner CHINA PETROLEUM & CHEM CORP
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