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Aerogel catalyst and preparation method thereof

An airgel and catalyst technology, which is applied in the field of airgel catalyst preparation, can solve the problems of polyester products such as yellow color

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 zirconium source to obtain TiO 2 -ZrO 2 Co-precipitate;

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

[0017] (3) make the TiO 2 -ZrO 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 zirconium element in the zirconium source, the molar ratio of the titanium source to the zirconium source It can be 3-20:1, preferably 5-15:1.

[0020] According to the preparation method of the airg...

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 zirconium tetrapropoxide were dissolved in 150 mL of absolute ethanol to obtain solution A1. Under stirring, at a room temperature of 20°C, slowly drop ammonia water with a concentration of 3 mol / L into solution A1. When the pH value of the solution is 9, stop adding ammonia water, continue stirring for 2 hours, and then age for 15 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 at a weight ratio of 1:20 to obtain an alcohol gel, which was added to an autoclave and washed with anhydrous Ethanol is used as a supercritical medium, and the alcohol gel is subjected to supercritical drying under the conditions of 262 ° C and 8.5 MPa. The supercritical drying time is 80 minutes, thereby...

Embodiment 2

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

[0049] Measure 18 mL of titanyl sulfate solution with a concentration of 4 mol / L and mix with 40 mL of zirconium nitrate solution with a concentration of 0.15 mol / L to obtain solution A2. Under stirring, at a room temperature of 20°C, slowly drop ammonia water with a concentration of 3 mol / L into solution A2. When the pH value of the solution is 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 at a weight ratio of 1:20 to obtain an alcohol gel, which was added to an autoclave and washed with anhydrous Ethanol is used as a supercritical medium, and the alcohol gel is subjected to supercritical drying under the conditions of 262 ° C and 8.5 MPa. The supercritical ...

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Abstract

The invention provides an aerogel catalyst which is aerogel particle containing TIO2 and ZrO2, the particle diameter of the aerogel particle is 10-200mn, and the density is 30-600mg / cm<3>. The invention also provides a preparation method of the aerogel particle. Biodegradable copolyester prepared from the aerogel catalyst provided by the invention has high degree of polymerization and more intensive molecular weight distribution, and the detect that the color of the biodegradable copolyester is yellow color is alleviated.

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): C08G63/85
CPCY02P20/54
Inventor 陈锡荣黄凤兴
Owner CHINA PETROLEUM & CHEM CORP
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