JPH0755282B2 - ▲ Ro ▼ How to pass - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a liquid superfluid using an existing superauxiliary agent such as diatomaceous earth, potassium titanate, pulp and linter, and a superauxiliary agent in which microfibrillated fibers are used in combination. About the method,
It concerns how to pass liquid foods and medicines.

<Prior Art> Liquid foods such as liquor, wine, beer, soy sauce, and vinegar produced from agricultural products as raw materials through processes such as squeezing, fermentation, excess, and blending are essential processes.

Generally, in such a liquid food, various hydrophilic impurities are suspended during production. In order to efficiently clarify such a liquid, a method is used in which a super-auxiliary agent is used and hydrophilic impurities are allowed to adhere or be adsorbed thereto.

As a super-auxiliary agent, asbestos, diatomaceous earth, acid clay, clay, colloidal soil, alumina, silica, alkali titanate, anthracite,
Inorganic and organic particles and fibers such as charcoal, pulp and sawdust have been used. Among these, asbestos has the highest performance,
That is, it has a high capture rate and little clogging, and in Japan, it has been overused for alcoholic beverages.

However, since asbestos dust is particularly harmful to the respiratory organs of the human body, the production and use of asbestos are considered unfavorable from the viewpoint of occupational safety and health, and the development of a hyperauxiliary agent to replace asbestos is desired.

<Problems to be solved by the invention> As an alternative to asbestos, a method has been developed in which refined linter is decomposed into a specific range and fibrillated linter fiber is used as the auxiliary agent (Japanese Patent Publication No. 60-59003). ). The fibrillated linter fiber has a thickness of the fibrillated portion of about 1/10 of the original fiber, and due to the effect of the relatively rigid linter fiber main body and the fibrillated portion, there is little clogging, It is a super-auxiliary agent with a good capture rate.

However, the disadvantage is that the formation of a stable precoat layer is inferior to that of asbestos, and it is necessary to re-dissociate before use because the fibrillated part becomes keratinized once dried, and therefore a disintegrator for that is required, There was such a problem.

<Means for Solving the Problem> In recent years, a method for microfibrillating cellulose fibers by a special method has been developed. This method involves suspending cellulose fibers in water, passing them through a small diameter orifice with a pressure difference of at least 200 kg / cm ² , colliding with the vessel wall at high speed and rapidly decelerating, thereby giving a shearing force to the fibers. Cellulose fibers are divided into microfibril units by repeating the process (Japanese Patent Publication No. 60-19921). An apparatus suitable for this microfibrillation is a homogenizer manufactured by Gaulin. The size of the microfibril is less than 1/100 of the original fiber, the original fiber is completely lost when the above treatment is completely performed, and the suspension contains only microfibrillation and aggregates thereof. Can be obtained as This microfibrillation of cellulose fibers can be applied to not only natural cellulose fibers such as pulp, cotton, and linter, but also so-called ion-exchange cellulose fibers in which ion-exchange groups are introduced while maintaining the fiber state. . The ion exchange cellulose fibers to which the present invention can be applied include both cation exchangeable cellulose and anion exchangeable cellulose such as carboxymethyl cellulose, cellulose phosphate, sulfoalkyl cellulose, diethylaminoethyl cellulose, polyethyleneiminocellulose and the like.

These microfibrillated fibers when formed alone form a very dense layer, which makes the layer very low in water and unsuitable for use as a super-auxiliary agent.

However, when used in combination with many conventionally known superauxiliaries,
It was found that an excellent effect was obtained, and the present invention was reached.

<Structure of the Invention> The present invention relates to a liquid process using a super-auxiliary agent comprising two or more components, wherein one component is a microfibrillated fiber of cellulose or a fibrous derivative thereof. It relates to the liquid passing method.

The term "microfibrillated fiber" as used herein refers to a fiber obtained by treating a natural cellulose fiber or a fibrous derivative thereof, such as an ion exchange cellulose fiber, by the method disclosed in JP-B-60-19921. The characteristics of microfibrillated fiber are that the fiber diameter is extremely small and that it has a great affinity for water,
That is, it shows extremely large suspension stability. The following value is defined as the "stability amount" as a characteristic value indicating this suspension stability.

"Water dispersion 100m containing 2.0% by weight of water-insoluble substance
In a graduated cylinder and left at room temperature for 1 hour, the amount of the transparent supernatant liquid is 100-A when Am is used. "Microfibrillated fibers of cellulose and cellulose derivatives have a stable amount of 50- Is 100.

There is no particular limitation as other super-auxiliary agent used in combination with microfibrillated fiber, and diatomaceous earth, acid clay, porcelain clay, colloidal soil, alumina, silica, potassium titanate, anthracite, charcoal, pulp, sawdust, etc. can be used. . The method of use is 0.5 to 50% by weight, preferably 1 to 1 based on these other super-auxiliaries.
0% by weight of microfibrillated fibers are used together. The method may be used by pre-coating or body feeding method by slurry-mixing with other super-auxiliary agent, but the pre-coat layer of microfibrillated fiber is superposed on the pre-coat layer formed by other super-auxiliary agent. May be. The features of the present invention are exerted particularly advantageously when the latter method is adopted.

<Effects of the Invention> In the method of the present invention using a microfibrillated fiber and another super-auxiliary agent, when the body feed method is used, the dispersion and suspension properties of the other super-auxiliary agent are insufficient, Dispersion and suspension properties are improved, and a uniform overlayer is formed.

Even in the precoating method, the simultaneous use thereof has the effect of improving the dispersibility and suspension property of the super-assisting agent, and the uniform pre-coating property, but first forming another pre-assisting agent pre-coating layer,
When a method of forming a precoat layer of microfibrillated fibers thereon is taken, the microfibrillated fibers show an action of first filling pinholes or defective portions of the precoated layer already formed, and for example, When a few% of the above-mentioned super-auxiliary agent is used, the over-layer with improved trapping property is obtained without increasing the overall over-resistance, and the clarifying property of the treated liquid is improved.

The present invention is described below with reference to examples, but the present invention is not limited thereto.

Examples and Comparative Examples A polystyrene latex was filtered by a precoating method using a super-auxiliary agent obtained by treating a purified linter and microfibrillated cellulose by the method described in JP-B-60-59003.

The lintering superaidant used is equivalent to the sample E of Example in the specification of JP-B-60-59003 (fiber length 1.1 mm, DP resolution 42
° SR).

The microfibrillated cellulose was made into a 2% by weight slurry of wood pulp, and 420 g was obtained using a Gaulin homogenizer.
g / cm ² at 10 times repeatedly with those obtained by processing "stable amount"
Is 100.

Sekisui polystyrene latex (0.78 μm) precoated with a lintering aid on a cloth supported by wire mesh.
(containing φ, 10 ppm) was passed under suction of 20 mmHg, and the polystyrene latex concentration of the liquid was measured.

(Comparative Example) Similarly, a microfibrillated cellulose was pre-coated on the linter super-aid agent pre-coat layer, and an over-test was conducted in the same manner.

(Example) Precoat conditions and test results are shown in the table. The combined use of a small amount of microfibrillated cellulose significantly improved the overperformance of the linter precoat layer.

Claims (2)

[Claims] 1. A liquid filtration method using a super-auxiliary agent comprising two or more components, wherein one component is a microfibrillated fiber of cellulose or a fibrous derivative thereof. Method. 2. A precoat layer of microfibrillated fibers is formed on a precoat layer formed of components other than the microfibrillated fibers, and the liquid is treated with the composite precoat layer. The method for passing a liquid according to item 1.