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Attapulgite clay loaded lewis acid catalyst, preparation method and applications thereof

A technology of attapulgite clay and acid catalyst, applied in chemical instruments and methods, physical/chemical process catalysts, refining with metal salts, etc., can solve the problems of small specific surface area and small effective adsorption surface area of ​​olefin substances, and achieve high olefin desorption The effect of good removal rate, good catalyst stability and good industrial application prospect

Inactive Publication Date: 2015-11-04
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, bentonite is generally used as raw material to prepare activated clay in industry, but the specific surface area of ​​bentonite is small, and the effective adsorption surface area of ​​olefin substances formed is also small.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Dissolve 1.32g zinc chloride in 66mL water, stir at room temperature to form a solution, add acidified attapulgite clay (specific surface area is 261m 2 / g) 25.00 g, dried at 60°C with constant temperature stirring, and roasted at 120°C for 4 hours to obtain an acidified attapulgite clay-supported zinc chloride catalyst, in which the mass fraction of zinc chloride was 5.0%. Put 30mL of the prepared acidified attapulgite clay-supported zinc chloride catalyst into a fixed bed reactor with a loading capacity of 30mL. Under the conditions of a pressure of 1.0MPa and a reaction temperature of 180°C, pump in a bromine index of 850mgBr at a rate of 1.0mL / min. Aromatics reformed oil per 100g oil, after 8 hours of reaction, the olefin removal rate is 87.6%.

Embodiment 2

[0020] Dissolve 2.78g of zinc chloride in 56mL of water, stir at room temperature to form a solution, add acidified attapulgite clay (specific surface area is 180m 2 / g) 25.00 g, stirred and dried at 70°C, and roasted at 150°C for 5 hours to obtain an acidified attapulgite clay-supported zinc chloride catalyst, in which the mass fraction of zinc chloride was 10.0%. Put 30mL of the prepared acidified attapulgite clay-supported zinc chloride catalyst into a fixed bed reactor with a loading capacity of 30mL. Under the conditions of a pressure of 1.5MPa and a reaction temperature of 200°C, pump in a bromine index of 260mgBr at a rate of 3.0mL / min. Aromatics reformed oil per 100g oil, after 8 hours of reaction, the olefin removal rate is 90.2%.

Embodiment 3

[0022] Dissolve 4.41g zinc chloride in 74mL water, stir at room temperature to form a solution, add acidified attapulgite clay (specific surface area is 300m 2 / g) 25.00 g, dried with constant temperature at 90°C, and roasted at 300°C for 2 hours to obtain an acidified attapulgite clay-supported zinc chloride catalyst, in which the mass fraction of zinc chloride was 15.0%. Put 30mL of the prepared acidified attapulgite clay-supported zinc chloride catalyst into a fixed bed reactor with a loading capacity of 30mL. Under the conditions of a pressure of 1.3MPa and a reaction temperature of 180°C, pump in a bromine index of 200mgBr at a rate of 9.0mL / min. Aromatics reformed oil per 100g oil, after 8 hours of reaction, the olefin removal rate is 88.5%.

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Abstract

The present invention discloses a Lewis acid catalyst adopting acidified attapulgite clay as a carrier and used for removing trace olefin from aromatic hydrocarbon reformate, wherein the mass content of the active component Lewis acid is 5.0-20.0%. The catalyst preparation method sequentially comprises: adding water to Lewis acid to dissolve so as to obtain a solution with a mass concentration of 0.02-0.06 g / mL; and adding acidified attapulgite clay to the aqueous solution containing the Lewis acid according to a mass ratio of the Lewis acid to the acidified attapulgite clay of 1:4-19, carrying out constant temperature stirring drying, and carrying out calcination so as to obtain the acidified attapulgite clay-loaded Lewis acid catalyst. According to the present invention, the catalyst has characteristics of no precious metal, low cost, simple preparation, high olefin removal rate and good stability, wherein the olefin removal rate on the aromatic hydrocarbon reformate after reacting for 8 h is more than or equal to 85.0% so as to provide the good industrial application prospects.

Description

technical field [0001] The invention belongs to the field of aromatic reformed oil production, and relates to an acidified attapulgite clay-supported Lewis acid catalyst and a preparation method thereof, and its application in removing trace olefins in aromatic reformed oil. Background technique [0002] During the production of aromatics reformate in aromatics complex, due to the existence of some side reactions, the product often contains a small amount of olefins. These olefin impurities are easy to react, and produce undesired by-products in the downstream processing process, which affects the acid wash colorimetry of aromatic products; the olefins in xylene entering the p-xylene adsorption separation unit can occupy the voids of the molecular sieve adsorbent, which is beneficial to Molecular sieve adsorbents are toxic and affect device performance; in addition, the presence of olefins and dienes in circulating toluene may lead to mixed-feed heat exchanger internal struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/10B01J27/122B01J27/125C10G29/12
Inventor 李泽壮刘经伟陈韶辉杨爱武柏基业刘丽娟王英武
Owner SINOPEC YANGZI PETROCHEM
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