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Modified alumina composition and preparation thereof

A composition, alumina technology, applied in chemical instruments and methods, catalyst activation/preparation, chemical/physical processes, etc., can solve problems such as poor isomerization selectivity of straight-chain hydrocarbons, reduce olefin content, and promote isomerization. chemical reaction, the effect of increasing the content

Active Publication Date: 2008-05-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The compositions in the above patents all use alkali metal aluminates or solutions containing alkali metal aluminates as raw materials, so the compositions will also form Acid sites, which are less selective for the isomerization of linear hydrocarbons and which were invented to prepare hydrofinishing catalyst supports rather than to provide matrix components for cracking catalysts

Method used

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  • Modified alumina composition and preparation thereof
  • Modified alumina composition and preparation thereof
  • Modified alumina composition and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The silica modified alumina composition provided by the invention is prepared.

[0029] 500 g deionized water and 506.5 g AlCl 3 ·6H 2 16.1 grams of water glass solution (Shandong Aluminum Factory, SiO 2 content is 20.6%), reacted at room temperature for 30 minutes, then added dropwise 1:1 ammonia water (Beijing Chemical Plant, analytically pure) to adjust the pH value until a gel was formed, and its pH value was 4.5, and continued to stir and heat up to 65°C , stop stirring and age for 1 hour, vacuum filter. The filter cake was reslurried with decationized water at 60°C for 30 minutes and vacuum filtered. So repeated washing 3 times, to obtain the modified composition M 1 . Its chemical composition, physicochemical properties and surface acidity measured by pyridine adsorption infrared spectroscopy are listed in Table 1.

Embodiment 2

[0031] Preparation of the silica-modified alumina composition provided by the invention.

[0032]500 g deionized water and 475.2 g AlCl 3 ·6H 2 Slowly add 48.2 grams of water glass solution dropwise to the solution of O, react at room temperature for 25 minutes, then add dropwise 1:1 ammonia water to adjust the pH value until a gel is formed, and its pH value is 4.8, continue to stir and heat up to 60°C , stop stirring and age for 1.5 hours, vacuum filter. The filter cake was reslurried with 70°C decationized water for 25 minutes and vacuum filtered. So repeated washing 3 times, to obtain the modified composition M 2 . Its chemical composition, physicochemical properties and surface acidity measured by pyridine adsorption infrared spectroscopy are listed in Table 1.

Embodiment 3

[0034] Preparation of the silica-modified alumina composition provided by the invention.

[0035] 500 grams of deionized water and 454.5 grams of AlCl 3 ·6H 2 Slowly add 69.6 grams of water glass solution to the solution of O, react at room temperature for 30 minutes, then add dropwise 1:1 ammonia water to adjust the pH value until a gel is formed, the pH value is 5.5, continue to stir and heat up to 70 °C , stop stirring and age for 1.5 hours, vacuum filter. The filter cake was reslurried with 65°C decationized water for 30 minutes and then vacuum filtered. So repeated washing 3 times, to obtain the modified composition M 3 . Its chemical composition, physicochemical properties and surface acidity measured by pyridine adsorption infrared spectroscopy are listed in Table 1.

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Abstract

A modified alumina composition used as the matrix of cracking catalyst to increase the content of isoalkane in gasoline contains alumina (80-99.5 Wt%) and silicon oxide (0.5-20 Wt%). Its preparing process includes such steps as adding the alkaline aqueous solution of silicate to the aqueous solution of Al salt for regulating pH value until gel is generated, heating the gel to 45-95 deg.C, ageing, filtering and washing.

Description

technical field [0001] The invention relates to a modified alumina composition and a preparation method thereof, more specifically, a silica-modified alumina composition and a preparation method thereof. Background technique [0002] As environmental protection has increasingly stringent quality requirements for gasoline products, gasoline has developed from unleaded gasoline to new formula gasoline. There are clear restrictions on the content of olefin components in the reformulated gasoline standard. For example, the Class II gasoline standard in the World Fuel Oil Specification requires that the olefin content in gasoline components be less than 20% by volume. China's gasoline standards implemented in the three major cities of Beijing, Shanghai, and Guangzhou from July 1, 2002 require that the olefin content in gasoline components be less than 35% by volume. China's future gasoline quality standards will further limit the content of olefin components in gasoline. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/12B01J37/03C10G11/05
Inventor 宋海涛蒋文斌达志坚陈蓓艳
Owner CHINA PETROLEUM & CHEM CORP
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