JPH09313162A - Production of sake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously remove dreg components and an added active carbon in a Sake (a Japanese fermented mildly alcoholic beverage made of rice) after pasteurization with a membrane without adding a dreg settling agent thereto. SOLUTION: An activated carbon is added to Sake (a Japanese fermented mildly alcoholic beverage made of rice) after pasteurization and an internal pressure circulating filtration is then carried out at a circulation flow rate of >=1.0m/s linear velocity by using a hollow yarnlike ultrafiltration membrane having ι6,000 fractionation molecular weight and >=1.00mm inside diameter of the membrane to simultaneously remove dreg components and the activated carbon in the Sake. Labors in operations due to the addition of a dreg settling agent or a filter aid can be omitted to produce a high-quality product. Concentration and filtration can be carried out without causing clogging even to a high concentrating degree. Since the water permeation retention ratio after the filtration is high, the hollow yarnlike ultrafiltration membrane can repetitively be used to carry out economical, efficient and stable production.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD [0001] The present invention uses a filtration membrane to prevent the addition of a flavor-lowering agent to sake after burning.
The present invention relates to a method for producing sake by removing the agglomerate component and activated carbon.

[0002]

2. Description of the Related Art Conventionally, in the method for producing sake, in the purification of sake after burning, activated carbon is added for decolorization and flavor adjustment, persimmon astringent etc. is added as a depressant, and the supernatant is filtered. It was filtered with a press or the like. In addition, Tokuhei 2
As described in Japanese Patent Publication No. 8706, after adding activated carbon and an oil-lowering agent to sake after burning, an average pore diameter of 0.0
A method of performing external pressure total filtration treatment with a microfiltration membrane of 2 μm to 0.2 μm is also known and is generally performed.

[0003]

In the conventional method, it is necessary to add the anti-thrusting agent and leave it for several days until coagulation and settling occurs. Therefore, a considerable number of tanks are required or continuous treatment is required. There was a problem that it became difficult. Also, depending on the quality of liquor, the amount of anti-depressant used was different from that shown in the efficacy statement, so it was necessary to carry out a preliminary test.

In the method of external pressure total filtration using a microfiltration membrane described in Japanese Patent Publication No. 2-8706, it is necessary to increase the particle size of the sediment and agglomerate the sediment component. In addition to activated charcoal, zeolite, persimmon astringent, gelatin, etc. must be used in addition to activated carbon, and it is necessary to select the type and amount of depressant depending on the type of sake. there were.
In addition, as the amount of treated sake increases, the amount of cake produced becomes too large and clogging may make regeneration difficult. Therefore, chemical cleaning had to be repeated.

[0005]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have added activated carbon to sake after burning and used a specific hollow fiber type module,
By operating under specific conditions, we have found a method for producing sake that can remove activated carbon and sediment at the same time without adding a sediment lowering agent, hardly cause clogging, and can be concentrated and filtered to a high degree of concentration. It came to completion.

That is, according to the present invention, in the method for producing sake, hollow fiber-like ultrafine particles having a molecular weight cutoff of 6,000 or more and an inner diameter of the membrane of 1.0 mm or more are obtained after adding activated carbon to the sake after burning. A method for producing sake, which comprises a step of simultaneously removing an ori component and activated carbon in sake by internal pressure circulation filtration at a linear velocity of 1.0 m / sec or more using a filtration membrane. As the activated carbon in the present invention, any of powdered activated carbon, granular activated carbon and fibrous activated carbon can be used, but from the viewpoint of work efficiency, it is effective to use powdered activated carbon having a strong decolorizing power and a high adsorption ability.

Further, the hollow fiber ultrafiltration membrane which can be used in the present invention needs to have a molecular weight cutoff of 6,000 or more. As the material of the membrane, any material that does not adversely affect the quality of alcohol such as polysulfone, polyacrylonitrile, polyolefin and polyvinyl alcohol can be used, and a hydrophilic material is particularly preferable. The inner diameter of the membrane is required to be 1.0 mm or more, and if it is smaller than this, the activated carbon powder is clogged in the hollow portion of the membrane and the circulating flow rate is reduced, or the effective membrane area is reduced, which causes the flux to be reduced.

[0008] Usually, when deenzyme of unburned sake (sake that has not been fired after squeezing) is carried out with a membrane, since activated carbon is not added, it is used at a linear velocity of less than 1.0 m / sec. However, when the suspension of sake containing the powdered activated carbon of the present invention is passed through the hollow fiber ultrafiltration membrane, the circulation flow rate must be 1.0 m / sec or more at a linear velocity. By setting the linear velocity to 1.0 m / sec or more, clogging of activated carbon in the hollow portion of the hollow fiber membrane is prevented, and highly concentrated filtration becomes possible.

If the concentration is low, the residual liquor must be collected, mixed with other sake, and filtered again, which is a labor burden. , The recovery rate of sake is improved, and a great economic advantage can be obtained. The linear velocity here is a value obtained by dividing the circulation flow rate in the hollow fiber ultrafiltration membrane by the membrane cross-sectional area. Although an external pressure filtration method can be used as the filtration method, the internal pressure filtration method is preferable because the activated carbon is deposited in the yarn bundle and becomes difficult to use repeatedly.

As a more stable filtration method, it is effective to carry out backwashing in which the filtrate collected and accumulated is periodically returned with a gas, and this backwashing prevents clogging of the hollow portion. The gas referred to herein may be any gas that does not affect the quality of liquor, such as air, nitrogen gas, and inert gas, and is preferably air in consideration of economy and versatility. Once you have an occlusion,
It is important not to cause clogging at the membrane inlet and hollow part, because the clogging is accelerated in a chained manner by using that portion as a trigger.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments. (Example 1) Commercially available powdered activated carbon (water content 50%, average particle size 6.6 μm) was added to 1,000 liters of burned sake.
After adding kg and stirring, the mixture was allowed to stand for 1 hour, and a hollow fiber ultrafiltration membrane made of polyacrylonitrile (made by Asahi Kasei Kogyo Co., Ltd., molecular weight cut-off 13,000) was used from a horizontal nozzle at the bottom of the tank.
0, membrane inner diameter 1.4 mm) outer diameter 3 inches including 725
It was passed through a filtration module having a length of 1,129 mm and a membrane area of 3.1 m ² at a flow rate of a hollow fiber inner linear velocity of 1.3 m / sec.

The filtration condition at this time is that the inlet pressure is 2.0 k.
g / cm ^2, outlet pressure was 1.4kg / cm ^2. Further, the filtrate accumulated on the secondary side of the module was backwashed periodically by air pressure every 30 minutes of filtration. The backwash conditions were a pressure of 2 kg / cm ² and a backwash time of 30 seconds. Circulation filtration was performed under these conditions, and finally concentrated to 14 liters. The time required at that time was 8 hours.

The filtration conditions are shown in Table 1. The results are shown in Tables 2 and 3.
As shown in Fig. 3, high concentration up to 70 times was possible, and clogging of activated carbon was not observed. The quality of the resulting filtrate was also good. After the filtration was completed, the water retention of the hollow fiber ultrafiltration membrane was measured, and it was found that it did not decrease at all.
This eliminates the need for cleaning with a chemical solution and enables repeated shifts to the next filtration step.

(Comparative Example 1) Hollow fiber ultrafiltration membrane made of polyacrylonitrile (manufactured by Asahi Chemical Industry Co., Ltd., molecular weight cutoff 1)
3,000, membrane inner diameter 0.8 mm) Outer diameter 3 inch including 2,025 pieces, length 1,129 mm, membrane area 4.7 m ² Filter module changed to pressure condition inlet pressure 2.15 k
It was carried out under the same conditions as in Example 1 except that it was carried out at g / cm ² and the outlet pressure was 1.25 kg / cm ² . The time required at this time was 10.7 hours, and the solution was concentrated to 71 liters. After the end of the circulation filtration, the inlet of the membrane was observed, and as a result, clogging of the hollow fiber membrane due to activated carbon was observed in about 30% of the membrane. The filtration conditions are shown in Table 1 and the results are shown in Tables 2 and 3.

(Comparative Example 2) Hollow fiber ultrafiltration membrane made of polyacrylonitrile (manufactured by Asahi Kasei Co., Ltd., molecular weight cutoff 1)
3,000, outer diameter 3 including 725 membrane inner diameter 1.4 mm)
Change the linear velocity in the hollow fiber of the filtration module of inch, length 1,129 mm, membrane area 3.1 m ² to 0.8 m / sec,
The pressure condition at this time was that the inlet pressure was 1.9 kg / cm ² ,
Example 1 except that the outlet pressure was 1.5 kg / cm ^2.
It carried out on the same conditions as. The time required at this time was 10.2 hours, and the solution was concentrated to 29 liters. After the end of the circulation filtration, no clogging was observed at the inlet of the membrane, but as a result of disassembling the membrane, activated carbon was clogged in about 10% of the membrane in the central part of the module. The filtration conditions are shown in Table 1 and the results are shown in Tables 2 and 3.

[0016]

[Table 1]

[0017]

[Table 2]

[0018]

[Table 3]

[0019]

INDUSTRIAL APPLICABILITY According to the present invention, by removing the salt component and the activated carbon without adding an orient-lowering agent to sake after burning,
Work efficiency in refining can be greatly improved and labor can be saved. In addition, it is possible to save the labor of the operation by adding the tilt reducing agent and the filter aid, and to manufacture a high quality product. It can be concentrated to a high degree of concentration, and the recovery rate of sake can be improved. Moreover, since it is not clogged and can be repeatedly used without chemical cleaning, economical and efficient stable production can be achieved.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Yamauchi 46-81 Hyuga, Momoyama-cho, Fushimi-ku, Kyoto-shi, Kyoto Prefecture

Claims (1)

[Claims] 1. A method for producing sake, wherein the fractionated molecular weight is 6,000 after activated carbon is added to the sake after burning.
As described above, a step of simultaneously removing the salt component and activated carbon in sake by the internal pressure circulation filtration at a linear velocity of 1.0 m / sec or more using a hollow fiber ultrafiltration membrane having an inner diameter of 1.0 mm or more is included. A method for producing sake, which is characterized in that