JP2991826B2 - How to treat liquid soup - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for producing a liquid stock, which comprises continuously treating the liquid stock with a specific porous membrane after burning or in a fresh state, and further using the obtained membrane retentate. The present invention relates to a method for recovering a liquid stock in a high yield by treating with an ultrafiltration membrane.

[0002]

2. Description of the Related Art An outline of a manufacturing process of a liquid stock is as follows. Soy sauce, sugar, mirin and various extracts,
Separate bonito, mackerel, etc. are added to the solution of the chemical seasoning, etc., and the juice is added. This burning is carried out in order to impart preservative properties by disinfecting microorganisms and inactivating enzymes, and also to give incense to those with low aroma to give a strong aroma. After the burning treatment, the mixture is allowed to stand still and naturally cooled, so that protein solids and phosphates become fine solids, and diatomaceous earth filtration is performed to remove the solids.

[0003]

However, in diatomaceous earth filtration, there is a problem that complete sterilization is impossible and the product is deteriorated with time. Also, in view of recent environmental problems, disposal of diatomaceous earth containing a large amount of putrefactive components has become a problem.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and is intended to treat liquid stocks at a high temperature by using a specific porous membrane and obtain such a process. By further treating the obtained membrane retentate with an ultrafiltration membrane, a liquid broth having a sufficient taste component can be economically recovered with high yield.

That is, according to the present invention, liquid dashi is used in the range of 15 to 80.
The solution was recovered by contacting with a porous membrane having an average pore size of 0.05 to 0.6 μm at a liquid temperature of 0.05 ° C., and the liquid was recovered as a filtrate (a). , And filtered to obtain a filtrate (b).
Provided is a method for treating liquid dashi, characterized in that the liquid dashi is recovered in high yield by combining the excess liquid (b) .

The liquid soups to which the present invention is applied are, for example, liquid soups such as noodle soup, ten soup, pot soup, boiled soup, and the like. In the present invention,
For fired products, after burning treatment, preferably a liquid stock immediately after burning, and for fresh products that are not subjected to burning sterilization treatment, by performing microfiltration treatment by contacting the porous membrane without performing burning treatment, And removing the microorganisms and coagulates of proteins and the like in the liquid stock, and putting the liquid stock containing valuable components such as nitrogen compounds on the filtration side for 90 to 9 days.
It is recovered in a yield of about 5%.

[0007] The porous membrane used here has an average pore size of 0.
It is a microfiltration membrane having a micropore structure of 05 to 0.6 μm.
If the average pore size is too small, the nitrogen compound serving as the umami component is excessively removed, and the taste is lowered, which is not preferable.
On the other hand, if the average pore size is too large, undesired substances such as coagulated substances such as microorganisms and proteins permeate to the filtration side, which is not preferable because the filtrate is deteriorated. The film thickness is usually 50
200200 μm. Although the form of the porous membrane is not particularly limited, a plate-and-frame type or a spiral type, which is preferably in the form of a flat plate, is exemplified. However, when the liquid to be treated has a low viscosity, a hollow fiber type is also applicable. As the film material, a material having heat resistance is preferable because the liquid is treated at a high temperature, and examples thereof include hydrophobic films such as polytetrafluoroethylene (PTFE), polyethylene, and polypropylene.

[0008] In the present invention, the membrane retentate obtained by the above treatment is further treated using an ultrafiltration membrane. on the other hand,
Since the filtrate obtained here is 10% or less of the total amount,
Umami components are not affected by using an ultrafiltration membrane.
By such a treatment, the treatment of the high-viscosity film holding liquid can be performed.

The form of the ultrafiltration membrane is not particularly limited, but is preferably a tubular type or a rotating disk type. The nominal molecular weight cut-off of the ultrafiltration membrane is 10,000 to 1,0
Preferably it is 00,000. Here, the nominal molecular weight cut-off is a value determined by filtering a spherical protein solution having a molecular weight of each size and measuring the rejection.
The material of the ultrafiltration membrane is not particularly limited, but includes polysulfone, polyolefin, ethylene vinyl-
Various synthetic polymers such as an alcohol copolymer, polyvinyl alcohol, polyacrylonitrile, and polyamide can be used. The treatment temperature is preferably as high as possible, usually 15 to 80 ° C, preferably 50 to 70 ° C.
It is. If the temperature is too low, the viscosity of the liquid becomes high, and the processing ability is undesirably reduced.

[0010]

According to the present invention, liquid dashi can be recovered in high yield, and a liquid dashi excellent in quality stability can be obtained. In addition, there is an advantage that the problem of disposal of diatomaceous earth containing putrefactive components, which has conventionally occurred in large quantities, is eliminated.

[0011]

EXAMPLES Examples of the present invention will be described below, but the present invention is not limited thereto. Example Using a plate-type module (membrane area: 3 m ² ) equipped with a plate-shaped porous membrane (PTFE, made by Nitto Denko Corporation; trade name: NTF-5200) having an average pore diameter of 0.2 μm, a three-fold concentrated noodle soup was fired. (80 ° C) immediately after (liquid temperature 65 ° C), average pressure
Under a condition of 2.5 kgf / cm ² and a linear velocity of 1 m / sec, the enrichment ratio is 10 times (Mentsuyu recovery rate: 90%), and the membrane retentate is further treated with a tubular ultrafiltration membrane (polysulfone, Nitto Denko) Manufactured by NTU-35100 (trade name: molecular weight cut off: 100,000, tube diameter: 11.5 mm)
m ² ) at an average pressure of 4 kgf / cm ² and a linear velocity of 2 m / sec.
%). Table 1 shows the analysis results of the filtrate.

[0012]

[Table 1] * No orizon after 10 days.

[0013] The filtration flux is 115 l / m ² · h at the initial stage and 21 l / m ² · h at the final stage (concentration ratio 10 times, recovery rate of Mentsuyu 90%) in the microfiltration treatment using a flat porous membrane. , On average
It was 59 l / m ² · h. Furthermore, the filtration flux when the retentate was treated with a tubular ultrafiltration membrane was initially 36 l / m ²
Final time (concentration ratio 10x, noodle soup recovery rate total 99
%) And 12 l / m ² · h on average, and 21 l / m ² · h on average.

Claims (1)

(57) [Claims] 1. A liquid stock is brought into contact with a porous membrane having an average pore size of 0.05 to 0.6 .mu.m at a liquid temperature of 15 to 80.degree. C. and filtered to collect the liquid stock as a filtrate (a). , And the resulting membrane retentate is further contacted with an ultrafiltration membrane for filtration.
Then, a filtrate (b) is obtained, and the filtrate (a) and the filtrate (b) are separated.
A method for treating liquid dashi characterized by recovering the liquid dashi in high yield by combining.