Titanium oxide - aluminum oxide composite carrier, preparation method and application thereof

A composite carrier, titanium oxide technology, used in catalyst activation/preparation, catalyst carrier, chemical instruments and methods, etc., can solve the problems of poor cohesion of the product, inability to form, and severe neutralization reaction, and achieve pressure resistance and Strong wear resistance, simple and convenient preparation method, avoiding the effect of exothermic reaction

Active Publication Date: 2005-11-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention has the following disadvantages: 1. The neutralization reaction is violent, and the temperature and speed of the reaction are difficult to control; 2. During kneading and extruding, the neutralization reaction product has poor cohesiveness and cannot be molded; 3. The produced titanium oxide - Alumina composite carrier basically has no strength and cannot meet industrial requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1 Preparation of titania-alumina composite carrier

[0049] 1) Preparation of NaAlO 2 Solution: Weigh 171.25 grams of sodium hydroxide, add 237.5 grams of water to dilute, and react with 192.5 grams of aluminum hydroxide in a three-necked flask at 105°C-110°C for 3-5 hours, then add deionized water to make a 500ml solution, Concentration is 25wt%, filter while hot to remove the impurity entrained by raw material, filtrate is NaAlO 2 solution.

[0050] 2) TiCl 4 Solution 22ml (TiO 2 Concentration: 25g / 100ml) and AlCl 3 ·6H 2 O crystal 123g mixed, adding deionized water to dilute to 333ml; 93.5ml NaAlO 2 The solution was diluted to 333ml with deionized water; under stirring, the titanium aluminum solution was mixed with NaAlO 2 The solution was poured into a four-necked flask at a flow rate of 20 ml / min at a temperature of 40° C. to carry out co-precipitation reaction. After the reaction, add ammonia water to adjust the final pH to 9, and directly filter a...

Embodiment 2

[0054] Using the same method as in Example 1, get TiCl 4 Solution 48.7ml, change titania content, prepare titania-alumina composite carrier, obtain the carrier B that titania content is 20wt%, its physical property parameter is as follows: surface area is 23m 2 / g, the total pore volume is 0.40cm 3 / g, the average pore diameter is 34.5nm, and the mechanical strength is 85N / particle. The carrier only has L acid, no B acid, the total acid content is 1.2A / g / cm2, and the carrier crystal form is α-Al according to XRD 2 o 3 , anatase TiO 2 .

Embodiment 3

[0056] Using the same method as in Example 1, get TiCl 4 Solution 83ml, change titania content, prepare titania-alumina composite carrier, obtain the carrier C that titania content is 30wt%, its physical property parameter is as follows: surface area is 20m 2 / g, the total pore volume is 0.48cm 3 / g, the average pore diameter is 46.5nm, and the mechanical strength is 80N / particle. The carrier only has L acid, no B acid, the total acid content is 1.4A / g / cm2, and the carrier crystal form is α-Al according to XRD 2 o 3 , anatase and rutile TiO 2 .

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PUM

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Abstract

The present invention discloses one kind of composite titania-alumina carrier and its preparation process and application. The composite carrier contains titania in 10-50 wt% and in anatase and / or rutile form and contains alumina in alpha-Al2O3 form. The composite carrier has acid surface and total acid amount of 0.6-8 A / g / sq cm. The preparation process includes the following steps: mixing titanium tetrachloride solution and AlCl3.6H2O crystal through stirring and diluting, mixing with sodium meta-aluminate solution to obtain aluminum titanium hydroxide precipitate, ageing, filtering, washing, drying, crushing, kneading, and roasting at 800-1200 deg.c to obtain the carrier. The composite carrier is used in selective hydrogenation and is favorable to reducing side product 'green oil' and prolonging the life of catalyst.

Description

technical field [0001] The invention relates to a petrochemical catalyst carrier and its preparation method and application, in particular to a titanium oxide-alumina composite carrier and its preparation method and its application in selective hydrogenation of carbon distillates. Background technique [0002] Ethylene is an important chemical raw material and can be used as a monomer for the production of polyolefins. The ethylene obtained from hydrocarbon cracking usually contains 0.2%-0.7mol% of acetylene, and if the cracking depth is high, the content of acetylene can be as high as 0.9mol%. During the synthesis of polyethylene, the presence of acetylene will reduce the activity of the polymerization catalyst, making the physical and chemical properties of the polymer worse. Therefore, the content of acetylene in ethylene must be reduced below a certain value to become a monomer for synthesizing polymers. , such as low-pressure polyethylene technology, requires the conte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00
Inventor 韦以刘新香
Owner CHINA PETROLEUM & CHEM CORP
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