Preparation method of magnetic cellulose microsphere and method for separating pigments from grease

A technology of cellulose microspheres and pure cellulose, applied in chemical instruments and methods, production of fat, fat oil/fat refining, etc., can solve problems such as difficulty in filtration, high oil absorption by clay, and small amount of oil hydrolysis

Active Publication Date: 2018-09-11
WUHAN POLYTECHNIC UNIVERSITY
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] In related literature, peanut shells, coffee bean skins, etc. are used as raw materials, and paraffin wax is attached on the surface, which is mainly used to adsorb oil in oil-water mixtures. However, although this oil adsorbent has a good adsorption effect, it also adsorbs Fatty acid, unsuitable for oil decolorization process
[0006] There are also relevant literatures pointing out that activated clay is a kind of adsorbent with high activity, which is made of bentonite as raw material and processed by artificial chemical treatment. It has a strong adsorption capacity for chlorophyll and other peptized impurities, but there are also obvious deficiencies. , has oil absorption, after decolorization, clay absorbs more oil, about 50% of oil absorption, and because of its high activity, when in contact with oil, it is easy to cause a small amount of hydrolysis of oil, resulting in an increase in the acid value of oil after decolorization
[0007] There are also related literatures pointing out that attapulgite is a magnesium-rich fibrous mineral whose main component is silicon dioxide. Its decolorization effect is good. Compared with activated clay, it uses less amount of decolorization, less oil loss and cheaper price. However, it is difficult to filter and will become a new impurity in the oil

Method used

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  • Preparation method of magnetic cellulose microsphere and method for separating pigments from grease
  • Preparation method of magnetic cellulose microsphere and method for separating pigments from grease
  • Preparation method of magnetic cellulose microsphere and method for separating pigments from grease

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preparation example Construction

[0040] The present invention provides a preparation method of magnetic cellulose microspheres, please refer to figure 1 , including the following steps:

[0041] S100, dissolving cellulose cotton linter pulp in LiOH / urea aqueous solution to obtain a cellulose solution;

[0042] Cotton linters are the short fibers that remain on the cottonseed (hairseed) after ginning, and these short fibers are peeled off by a stripping machine, which is cotton linters. Cotton linters are composed of three parts; the first part comes from the longer fibers of the "hair head"; the second part comes from the fibers on the wool seeds that were cut by the cotton gin; Dense fibers.

[0043] Preferably, the concentration of the cellulose solution is 4wt%.

[0044] The cellulose cotton fluff pulp was provided by Hubei Chemical Fiber Group Co., Ltd. (Hubei, Xiangfan), in which the α-cellulose content was higher than 95%. The cellulose cotton fluff pulp was dissolved in LiOH / urea aqueous solution an...

Embodiment 1

[0091] (1) Preparation of a transparent cellulose solution: 4.2 g of cellulose cotton fluff pulp was dissolved in 100 g of LiOH / urea aqueous solution (the mass ratio of LiOH to urea was 4.6:15) precooled to -12.6 ° C to obtain 4 wt % of cellulose The cellulose solution was degassed by centrifugation at 5° C. at 6000 rpm to obtain a transparent cellulose solution.

[0092] (2) Preparation of pure cellulose microspheres: under an ice-water bath at 0°C, add 10ml of epichlorohydrin to 100g of transparent cellulose solution, and stir for 2 hours to disperse the epichlorohydrin evenly;

[0093] Add 60g of Span 80 / Span 85 and 300ml of isooctane to a 500ml three-necked flask under an ice-water bath at 0°C, and stir at a speed of 300r / min for 30min to disperse the emulsifier evenly;

[0094] Stir the emulsifier at a speed of 1000r / min, add 60g of 4wt% cellulose solution after cross-linking reaction, continue stirring for 30min, remove the ice bath and continue stirring for 2h to obtain...

Embodiment 2

[0102] (1) Preparation of a transparent cellulose solution: 4.2 g of cellulose cotton fluff pulp was dissolved in 100 g of LiOH / urea aqueous solution (the mass ratio of LiOH to urea was 4.6:15) precooled to -12.6 ° C to obtain 4 wt % of cellulose The cellulose solution was degassed by centrifugation at 5° C. at 6000 rpm to obtain a transparent cellulose solution.

[0103] (2) Preparation of pure cellulose microspheres: under an ice-water bath at 0°C, add 10ml of epichlorohydrin to 100g of transparent cellulose solution, and stir for 2 hours to disperse the epichlorohydrin evenly;

[0104] In an ice-water bath at 0°C, add 60g of Span 80 / Span 85 and 300ml of isooctane into a 500ml three-necked flask, and stir at a speed of 500r / min for 30min to disperse the emulsifier evenly;

[0105] Stir the emulsifier at a speed of 1000r / min, add 60g of 4wt% cellulose solution after cross-linking reaction, continue stirring for 30min, remove the ice bath and continue stirring for 2h to obtain...

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Abstract

The invention discloses a preparation method of a magnetic cellulose microsphere and a method for separating pigments from grease. The preparation method comprises following steps: dissolving cellulose cotton short fiber slurry into a LiOH/urea water solution to obtain a cellulose solution; centrifuging and defoaming the cellulose solution to obtain a transparent cellulose solution; adding epoxy chloropropane into the transparent cellulose solution, stirring to trigger crosslinking reactions; adding the cellulose solution into an emulsifier after crosslinking reactions to carry out emulsification, stirring to obtain pure cellulose microspheres; cleaning the pure cellulose microspheres by ethanol and deionized water to obtain regenerated cellulose microspheres; adding a ferric chloride tetrahydrate solution into the regenerated cellulose microspheres to obtain a turbid mixture; adding a sodium hydroxide solution and a silver nitrate solution into the turbid mixture in sequence, and stirring to obtain the magnetic cellulose microspheres.

Description

technical field [0001] The invention relates to the technical field of biodegradation, in particular to a method for preparing magnetic cellulose microspheres and a method for separating pigments in oil. Background technique [0002] Grease decolorization is a necessary process for the production of high-quality edible oil. During this process, pigments, peroxides, trace metals, residual soap and phospholipids in the oil can be removed, and it can prevent the color return of the finished oil and increase the shelf life. The pigments in oils can be divided into natural pigments and non-natural pigments. Natural pigments mainly include carotene, carotenoids, chlorophyll, and red pigment, etc. Unnatural pigments are caused by chemical changes in oil during storage and processing. The oil color is generally dark red; the decomposition of quinones and proteins makes the oil brown. [0003] At present, the decolorization methods of oil mainly include the following several method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C11B3/10C08B15/10
CPCB01J20/24B01J20/28009B01J20/28021C08B15/10C11B3/10
Inventor 王国珍蔡礼彬蔡杰李亮龚贤哲李超
Owner WUHAN POLYTECHNIC UNIVERSITY
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