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Preparation method and application of acid modified attapulgite clay catalyst

A technology for attapulgite clay and catalyst, which is applied in the field of preparation of attapulgite catalyst, can solve the problems of blocking pores, catalyst deactivation and the like, and achieves the effect of simple preparation and good industrial application prospect.

Inactive Publication Date: 2012-10-17
NANJING YADONG AOTU MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In US4795550, molecular sieves are used to remove olefin components in mixed aromatics, but due to the strong acidity and small pores of molecular sieves, the polymerized products are easy to block the pores, resulting in rapid deactivation of the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh 200g of commercial attapulgite clay, add 100g concentration of 13% sulfuric acid aqueous solution (the mass ratio of sulfuric acid to water is 0.15:1), activate at a reaction temperature of 80°C for 10 hours, and the activated attapulgite clay sulfuric acid is suspended in Dry at 120°C for 0.5 hours, and the dried powder is calcined at 450°C for 8 hours to make an acid-modified attapulgite clay catalyst. The SO 4 2- The content is 5.0%. The prepared acid-modified attapulgite clay catalyst was loaded into a fixed-bed reactor, the reaction temperature was controlled at 180°C, and the liquid hourly space velocity was 6h -1 The proportion of bromine index is 300mgBr / 100g mixed aromatics, and the bromine index of the product after reaction is 15.66mgBr / 100g.

Embodiment 2

[0018] Weigh 200g of commercial attapulgite clay, add 400g concentration of 2% sulfuric acid aqueous solution (the mass ratio of sulfuric acid to water is 0.02:1), activate at a reaction temperature of 25°C for 24 hours, and the activated attapulgite clay sulfuric acid is suspended in After drying at 150°C for 6 hours, the dried powder was calcined at 350°C for 0.5 hour to make an acid-modified attapulgite clay catalyst, in which SO 4 2- The content is 2.8%. The prepared acid-modified attapulgite clay catalyst was loaded into a fixed-bed reactor, the reaction temperature was controlled at 200°C, and the liquid hourly space velocity was 3h -1 The proportion of bromine index is 300mgBr / 100g mixed aromatics, and the bromine index of the product after reaction is 7.88mgBr / 100g.

Embodiment 3

[0020] Weigh 200g of commercial attapulgite clay, add 100g concentration of 2% sulfuric acid aqueous solution (the mass ratio of sulfuric acid to water is 0.02:1), and activate it at a reaction temperature of 50°C for 12 hours, and the activated attapulgite clay sulfuric acid is suspended in Dry at 120°C for 3 hours, and the dried powder is calcined at 500°C for 4 hours to make an acid-modified attapulgite clay catalyst, in which SO 4 2- The content is 0.2%. The prepared acid-modified attapulgite clay catalyst was loaded into a fixed-bed reactor, the reaction temperature was controlled at 220°C, and the liquid hourly space velocity was 2h -1 The proportion of bromine index is 300mgBr / 100g mixed aromatics, and the bromine index of the product after reaction is 18.67mgBr / 100g.

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Abstract

The invention discloses a preparation method of an acid modified attapulgite clay catalyst, and the modified attapulgite clay catalyst is applied to removal of olefins in mixed aromatics. The acid modified attapulgite clay catalyst of the invention is prepared from commercial attapulgite as a precursor through sulfuric acid modification; and the preparation method is simple, and does not produce acidic wastewater emission. The catalyst exhibits excellent olefin removal performance, and bromine index of aromatic hydrocarbon removed with olefin can be reduced to lower than 20mgBr / 100g; therefore, the acid modified attapulgite clay catalyst has good prospects for industrial application.

Description

1. Technical field [0001] The invention relates to a preparation method of an acid-modified attapulgite clay catalyst, which is used for removing trace olefins in mixed aromatic hydrocarbons. 2. Background technology [0002] Aromatics are important basic organic raw materials in petrochemical industry, mainly produced by processes such as naphtha reforming and steam cracking. In the process of producing aromatics, the double centers on the surface of the reforming catalyst will lead to the formation of a small amount of by-product olefins. These olefins are active in nature, not only easy to form colloids and affect product quality, but also bring troubles to subsequent processing such as the adsorption and separation of aromatics. come difficult. In order to obtain qualified chemical raw materials and ensure the good operation of downstream processes, it is necessary to remove trace olefin impurities in aromatics. The bromine index is an important parameter reflecting th...

Claims

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Application Information

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IPC IPC(8): B01J27/053C07C15/00C07C7/163
Inventor 刘经伟马正东陈韶辉李泽壮杨爱武刘丽娟
Owner NANJING YADONG AOTU MINING
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