Aerogel catalyst and preparation method thereof

An aerogel and catalyst technology, which can be used in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., and can solve the problems of yellow color of polyester products.

Active Publication Date: 2012-05-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the catalytic activity of the polyester polycondensation catalyst used in this patent application has been improved, and the hue of the polyester product has been improved to a certain extent, the color of the polyester product will still turn yellow

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0014] The present invention also provides a kind of preparation method of airgel catalyst, and this method comprises the following steps:

[0015] (1) Co-precipitate the mixed liquid of titanium source and silicon source to obtain TiO 2 -SiO 2 Co-precipitate;

[0016] (2) the TiO 2 -SiO 2 The co-precipitate is contacted with an alcohol to obtain TiO 2 -SiO 2 Alcohol gel;

[0017] (3) make the TiO 2 -SiO 2 The alcohol gel is supercritically dried in the presence of a supercritical medium;

[0018] The alcohol is C1-C4 alcohol, and the supercritical medium is carbon dioxide, methanol or ethanol.

[0019] According to the preparation method of the airgel catalyst provided by the present invention, in step (1), based on the titanium element in the titanium source and the silicon element in the silicon source, the molar ratio of the titanium source to the silicon source It can be 1-20:1, preferably 5-15:1.

[0020] According to the preparation method of the airgel catal...

Embodiment 1

[0045] This example is used to illustrate the airgel catalyst provided by the present invention and its preparation method.

[0046] 82.7 mmol of tetraisopropyl titanate and 9.14 mmol of methyl orthosilicate were dissolved in 150 mL of absolute ethanol to obtain solution A1. Under stirring, ammonia water with a concentration of 3 mol / L was slowly added dropwise to the solution A1. When the pH value of the solution was 9, stop adding ammonia water, continue stirring for 2 hours, and then age for 20 hours. The mixture obtained after aging was centrifuged, washed three times with water, and the co-precipitate obtained after water washing was mixed with ethanol for 1.5 hours at 25°C to obtain an alcohol gel, which was added to the autoclave and used without Water ethanol is used as a supercritical medium, and the alcohol gel is supercritically dried for 80 minutes under the conditions of 262 ° C and 8.5 MPa, so as to obtain particles with a diameter of 50-100 nanometers and a dens...

Embodiment 2

[0048] This example is used to illustrate the airgel catalyst provided by the present invention and its preparation method.

[0049] 72.0 mmol of n-butyl titanate and 7.98 mmol of tetraethyl orthosilicate were dissolved in 100 mL of absolute ethanol to obtain solution A2. Under stirring, ammonia water with a concentration of 3 mol / L was slowly added dropwise to solution A2. When the pH value of the solution was 8, stop adding ammonia water, continue stirring for 2 hours, and then age for 36 hours. The mixture obtained after aging was centrifuged, washed three times with water, and the co-precipitate obtained after water washing was mixed with ethanol for 2 hours at 20°C to obtain an alcohol gel, which was added to the autoclave and used without Water ethanol is used as the supercritical medium, and the alcohol gel is supercritically dried for 60 minutes under the conditions of 262 ° C and 8.5 MPa, so as to obtain particles with a diameter of 60-120 nanometers and a density of ...

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Abstract

The invention provides an aerogel catalyst. The aerogel catalyst is aerogel particles containing TiO2 and SiO2. The particle diameter of each aerogel particle is 10-200 nanometers, and the density of the aerogel particles is 30-600 mg/cm<3>. The invention also provides a preparation method of the aerogel catalyst. Biodegradable copolyester prepared by using the aerogel catalyst provided by the invention has higher polymerization degree, the distribution of molecular weights is more centralized, and the defect of yellow color of the biodegradable copolyester is relieved.

Description

technical field [0001] The invention relates to an airgel catalyst and a preparation method of the airgel catalyst. Background technique [0002] At present, thermoplastic aromatic polyesters, which are widely used in industry and daily life, have excellent thermal stability and mechanical properties, are easy to process and low in price. Polyethylene terephthalate (PET), and polybutylene terephthalate (PBT), for example, have been widely used in the manufacture of fibers, films and containers. However, these aromatic polyesters are difficult to degrade after being used and discarded, and no obvious direct degradation of aromatic polyesters such as PET and PBT by microorganisms has been observed so far. In order to combine the excellent properties of aromatic polyesters, since the 1980s, those skilled in the art have devoted themselves to the research of synthesizing aliphatic-aromatic copolyesters, that is, introducing aromatic segments into aliphatic polyesters, which not...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/08B01J35/10
Inventor 陈锡荣黄凤兴
Owner CHINA PETROLEUM & CHEM CORP
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