Homogeneous composite cellulose/titanium oxide powder microspheres and its preparing process

A technology of composite microspheres and titanium dioxide, which is applied in the field of homogeneous cellulose/titanium dioxide composite microspheres and its preparation, can solve the problems of not developing a spherical expanded bed adsorption matrix, achieve regular shape, stable chemical properties, low cost effect

Inactive Publication Date: 2002-12-25
ZHEJIANG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Both cellulose and titanium dioxide are very cheap industrial raw materials. So far, there has been no report on the combination of the two to develop a spherical expanded bed adsorption matrix.

Method used

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  • Homogeneous composite cellulose/titanium oxide powder microspheres and its preparing process
  • Homogeneous composite cellulose/titanium oxide powder microspheres and its preparing process
  • Homogeneous composite cellulose/titanium oxide powder microspheres and its preparing process

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preparation example Construction

[0021] The steps of the preparation method of homogeneous cellulose / titanium dioxide composite microspheres are as follows:

[0022] 1) Prepare composite water phase

[0023] At room temperature, mix titanium dioxide superfine particles and industrial cellulose xanthate viscose at 5%-40% by mass, stir evenly, heat up to 25-35°C, and continue stirring for 30-45 minutes.

[0024] 2) Suspension heating and solidification into balls

[0025] Stop stirring, add oil dispersion phase and surfactant, then start stirring, suspend and disperse at 25-35°C for 30-60 minutes, raise the temperature to 90-95°C, keep warm for 1.5-2 hours, the viscose solidifies to obtain microspheres.

[0026] 3) Regeneration of homogeneous microspheres

[0027] The solidified microspheres are filtered out from the oil phase, washed with 1 to 2 times the volume of benzene to remove the oil layer, and then regenerated with 2 to 3 times the volume of methanol, ethanol solution containing 30% acetic acid or 10...

Embodiment 1

[0037] Add 100g industrial viscose (containing cellulose 8.2g, CS 2 3g, NaOH 6.2g, viscosity is 6800cSt) and 10g rutile type titanium dioxide, be warming up to 30 ℃ and stir for half an hour; Stop stirring, add 600mL by the mixed oil phase of pump oil and chlorobenzene preparation (pump oil: chlorobenzene=4: 1, mass ratio), adjust the stirring speed to 450rpm, keep the speed constant, suspend and disperse at 30°C for 45 minutes, raise the temperature to 90°C within 15 minutes, keep warm for 1.5 hours, and solidify to obtain yellow-white microspheres; microspheres from the oil phase filtered out, washed with 150mL benzene for 1 hour, regenerated with 200mL methanol for 1 hour, and regenerated with 200mL ethanol solution containing 30% acetic acid for 1 hour, washed with tap water three times, and sieved in a wet state to obtain particles with a particle size between 100 and 300 μm. White ball 42mL, density 1.16g / cm 3 .

Embodiment 2

[0039] Add 100g of the above-mentioned industrial viscose and 10g of anatase titanium dioxide in a 1-liter three-necked flask, heat up to 30°C and stir for half an hour; add 450mL of mixed oil phase prepared by pump oil and chlorobenzene (pump oil: chlorobenzene=6: 1, mass ratio) and 0.9g oleic acid, adjust the stirring speed to 300rpm, suspend and disperse at 30°C for 1 hour, heat up to 90°C within 15 minutes, keep warm for 1.5 hours, and solidify to obtain yellow-white microspheres; microspheres from the oil phase filtered out, washed with 200mL of benzene for 1 hour, 200mL of methanol for 1 hour, 200mL of 10% sulfuric acid solution for 1 hour, washed with tap water three times, and sieved in a wet state to obtain 48mL of white balls with a particle size between 100 and 300μm. The density is 1.16g / cm 3 .

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Abstract

A homogenized composite cellulose/titanium oxide powder microsphere is prepared through mixing superfine titanium oxide particles with industrial cellulose xanthate viscose, adding oil phase and surfactant to form water-in-oil suspension, heating, solidifying to obtain the spheres, washing with organic solvent, regenerating with acid, screening and floatage to obtain microspheres. Its advantages are high hydrophilicity, good roundness, high porosity, low cost and high resistance to acid and alkali.

Description

technical field [0001] The invention relates to a homogeneous cellulose / titanium dioxide composite microsphere and a preparation method thereof. Background technique [0002] Expanded Bed Adsorption (EBA) technology is a new type of protein separation and purification technology developed in the 1990s, which can directly capture the target product from the fermentation broth or cell homogenate, collect solid-liquid separation, concentration and initial Purification in one operation unit reduces the number of operation units, shortens the operation time, and saves production costs. It is known as the first new unit operation that has appeared in recent decades, and it is very fast in the downstream processing of bioengineering. Has been widely used. Expanded bed is a special case of fluidized bed. Based on the stable classification behavior of adsorbent in expanded bed, its theoretical plate number is much higher than that of ordinary fluidized bed a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/00C08K3/22C08L1/02
Inventor 姚善泾朱自强雷引林林东强关怡新
Owner ZHEJIANG UNIV
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