JPS6059003B2 - filter aid - Google Patents

Description

Detailed Description of the Invention The present invention provides a filtration system suitable for filtration during the manufacturing process of foods with excellent taste, such as alcoholic beverages (alcohol, wine, beer) and seasoning foods (vinegar, soy sauce, ajirin, sugar). There is something about auxiliaries.

In detail, it can be obtained by refining and beating linter. The present invention relates to a filter aid made of purified linter fibers having an α-cellulose content of 95% or more and a beating degree of 300 to 550. Filtration is an essential technique in the production of liquid foods such as alcoholic beverages, wine, beer, soy sauce, and vinegar, which are obtained from agricultural products as starting materials through methods such as compression, dairy fermentation, and concentration.

Generally, various hydrophilic impurities are suspended in such liquid foods during the manufacturing process. In order to efficiently filter such liquids, adding an adsorbent or filter aid to adsorb hydrophilic impurities while filtering reduces clogging during filtration, reduces filtration resistance, and captures impurities. The results show that the rate is good. The body feed method is a method in which a filter aid is mixed into the liquid to be filtered and filtered through a filter medium such as filter paper, filter cloth, wire mesh, porous ceramics, etc., and a certain amount of aid layer is deposited on the surface of the filter medium. The method of filtration is called the precoat method.

In the case of sake, a method is used in which the base sake containing activated carbon is filtered through a pre-coated filter. In this case, if the pre-coated layer of the filter aid is too dense, it will cause clogging, and if it is too coarse, the activated carbon powder will leak, so the selection of the filter aid is an important factor in workability and sake quality. .

Currently, the best filter aid for precoating is asbestos.

However, since it is recognized that asbestos dust is harmful if it enters the human body, the use of asbestos is undesirable in terms of occupational safety and health, and there is a demand for the development of a filter aid to replace asbestos. For example, diatomaceous earth requires a larger amount to be used than asbestos, so there are also problems in terms of use and disposal. Cellulose-based filter aids such as powdered pulp have the advantage of being incinerated, but with conventional cellulose-based filter aids, it has been difficult to filter without causing leakage or clogging. The present inventors focused on the unique performance of linter fibers and, as a result of intensive research, found that linter fibers were highly purified and beaten in water, and were adjusted to exhibit a certain range of fiber length and beating degree. We have found that it is particularly suitable as a filtering aid and have arrived at the present invention.

Linter fibers have a smaller fiber diameter and higher bulk than wood valve fibers, and have a higher α-cellulose content. When crude linter fibers are alkali-cooked and then treated with an oxidizing agent such as chlorine, sodium chlorite, sodium hypochlorite, or hydrogen peroxide, purified linter with an α-cellulose content of 95% or more can be obtained. The purified fibers are fibrillated and cut at the same time by subjecting them to strong shuring using water as a medium, that is, by beating them. At this time, the degree of cutting and fibrillation differs depending on the type of beating machine, the ratio of water and fibers, the way of applying surer, etc. Fibrillated cellulose has strong hydrogen bonds, and the overlapping portions of the fibrillated fibers exhibit viscosity and coagulate using water as a medium. Beating in which fibrillation takes priority is called viscous beating, and beating in which fiber cutting takes priority is called free beating. When beaten under the same conditions, linters are more easily beaten into free form than wood bulbs. Paper made by beating linter fiber into free form is
It is suitable for impregnating resins because of its good drug permeability, but it generally has a low degree of beating. On the other hand, linter fibers with an increased degree of beating, that is, with an increased degree of fibrillation, have so far had no special use. The present inventors have found that linter fibers with a higher degree of beating than those for impregnated paper are particularly suitable for precoat paper.
It has been found that it is suitable as a super-aiding agent.

That is, as the beating degree is increased, fibrillation occurs from the surface of the linter fiber, but the thickness of the fibrillated portion is about 1/2 of the fiber itself, which is comparable to the thickness of asbestos fiber. . It is believed that when the length of the fiber body and the degree of fibrillation are appropriate, a resin material that has a high capture rate during percolation and is less prone to clogging can be obtained. Fibers with a desired degree of freedom can also be obtained by first making paper from fibers with a lower degree of freedom, and then crushing the resulting paper. This is because the degree of beating progresses during the crushing process. Furthermore, when the filter aid of the present invention is used, the following advantages can also be enjoyed.

In other words, highly purified linter fibers contain less eluted iron than other Oki additives, so they can be used without impairing the purity or taste of foods processed with them. There are advantages. The present invention will be explained below using experimental examples.

Experimental example The method for preparing the linter fiber used in the test is shown below.

Table 1 shows the fiber length, degree of beating, and degree of polymerization of the above sample. The methods for these measurements are as follows. Fiber length: The average fiber length was determined using a Clark fiber length distribution measuring device using a prescribed method.

Freeness: Measured according to a prescribed method using a Schottsper-Riegler method freeness measuring device.

Degree of polymerization: Calculated from ACS viscosity measurement method viscosity shown in JIS 9OOl - Purification Cotton Linter Test Method.

Sample A was chemically analyzed and compared with a commercially available Valve P superaid.

The results are shown in Table 2. Example 1 The influence of Oki shoju on sake was investigated.

Add 25 grams of each p-superior to sake 1e, stir well,
After standing at 220° C. for 3 hours, the supernatant liquid was collected, the degree of coloration and iron content were measured, and a sensory test regarding taste (liquor taste) was conducted. The above amount of Oki-filtering agent added is much excessive compared to the amount normally used in Oki-filtering, and since activated carbon was not used, the experiment in this example was conducted to eliminate only the adverse effects of the components eluted from the Oki-filtering agent. This is a revealing test. Chromaticity (transparency T%)
The iron content (Ppm) was measured by the method shown in 1. National Tax Agency prescribed analytical method commentary.

In addition, the sensory test was expressed as the total value of the 3-point system (1, 2, 3) scoring by 11 judges. The higher the number, the worse the taste and aroma. The results are shown in Table 3. Blank is sake with no added sake additive. Example 2 An offshore overpass test was conducted on a commercial scale.

The treated liquid was filtered sake with activated carbon added, and was passed through a p-filter pre-coated with various filter aids. An outline of the processing conditions is as follows. Activated carbon: Powdered activated carbon (5% below 100 mesh, 25% 100-325 mesh, 3
25 mesh or more 70%) 150-200y
Oki-filter used per 1kt of sake; Moriya type jumbo filter (square type Oki-filter) P-filter area approx. 70d (7 forge) Pre-coated with Oki cloth;
It took me about 3 hours to record and drink 400 koku of sake.

Oki overpressure was measured at regular intervals, and p oversake was sampled to measure turbidity and carbon leakage.

The measurement method is shown below. Turbidity: Measured by the method shown in 1. National Tax Agency prescribed analytical method commentary.

Carbon leakage: Pour the sampling liquid through a 0.45μ pore diameter membrane.
It was treated with a prefilter and visually determined based on the dirt on the membrane filter.

Table 4 shows the auxiliary agents used and the p excess test results.

Also, fluctuations during offshore passage are due to increased resistance due to clogging, which is shown in Figure 1. Immediately after starting refers to the time when the supernatant portion is being treated, and immediately after pouring refers to the time when the portion containing activated carbon and sediment is being treated.
The time after 2 hours indicates a steady state time point.

[Brief explanation of drawings]

FIG. 1 is a graph showing clogging resistance curves when using various filter agent samples.

Claims (1)

[Claims] 1. α-cellulose content of 95% or more, fiber length 0.6, obtained by beating purified linter fibers into a viscous state using water as a medium.
A filter aid for precoat comprising fibrillated purified linter fibers with a diameter of 30° or more and 55° or less, and a diameter of 30° or more and 55° or less.