JPH05211855A - Treatment of sterilization dreg of soy sauce - Google Patents

Abstract

PURPOSE:To improve the efficiency of a soy sauce recovering process by filtering the sterilization dreg of say sauce with a plate-and-frame membrane filter. CONSTITUTION:A raw soy sauce is heat-treated by conventional process and left standing for 5 days in a product tank to separate dregs. The separated sterilization dreg is precipitated to the bottom of the tank and the upper clear liquid is recovered as the product. The precipitated sterilization dreg is supplied to a plate-and-frame membrane filter 2 having ultrafiltration membranes 16 and precision filtration membranes 17 and filtered to obtain the product as the filtrate having a turbidity of 0.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an invention for filtering soy sauce burned by a plate & frame type membrane filtration device.

[0002]

2. Description of the Related Art The soy sauce burning liquor is a general term for what precipitates and precipitates in the clarification process of the burning soy sauce obtained by pressing and sterilizing raw soy sauce obtained by squeezing soy sauce moromi. Derived insoluble protein,
It is a composition comprising a sparingly soluble amino acid, an organic acid salt, and a suspending bacterium. Since the soy sauce burning sauce precipitates in a state of being mixed with the soy sauce, efficient recovery of soy sauce from the soy sauce burning sauce is an important issue for those skilled in the art to improve productivity.

From this point of view, the applicant of the present invention has previously applied for "method of treating soy sauce for burning" (Japanese Patent Laid-Open No. 3-201963). This is a vacuum drum type filtration device that filters the liquid while forming a layer of filter aid on the circumference of a horizontal cylindrical rotatable filtration drum whose inside is held in vacuum. The invention is configured to do so.

[0004] In addition, the fired cage is made to have a hole diameter of 0.01.
Examples of the soy sauce drop-down treatment method (JP-A-56-45173) and the soy sauce drop-filtration method (JP-A-57-26560), in which a porous hollow fiber membrane having a particle size of 0.5 to 0.5 μm is used for treatment. ..

After that, the inventor of the present invention further conducted research, and formed by arranging plate-shaped filter members and filter membranes alternately.
Focusing on a plate-and-frame type membrane filtration device, which has features such as high product recovery rate and easy automation, it was conceived to treat the soy sauce burned by the device.

However, when a membrane is used to recover soy sauce from a burning dough, a microfiltration membrane is suitable from the viewpoint of quality maintenance, but in the plate & frame type membrane filtration device, the liquid channel is narrow and long, so Since the resistance is large and the filtration area is increased from a practical point of view, when the number of stages is increased, the flow path resistance tends to be further increased. Therefore, it was necessary to supply high-viscosity firing oil to the plate & frame type membrane filtration device at high pressure, resulting in clogging of the microfiltration membrane, and the microfiltration membrane was directly applied to the plate & frame type membrane filtration device. In this case, the permeation flux is significantly reduced, and the membrane area and pump power are increased in order to obtain the target volume reduction rate (retention fluid volume in membrane / volume of undiluted fluid), which poses a problem in practical use. It was

Further, the methods of JP-A-56-45173 and JP-A-57-26560 are inventions that use only a microfiltration membrane, and the structure of the membrane has a limit in the degree of enrichment by firing.

Therefore, the inventors of the present application further studied, and noticed that the permeation flux of the ultrafiltration membrane increased in proportion to the pressure, and in the plate & frame type membrane filtration device, the ultrafiltration membrane was placed on the upstream side. If the microfiltration membranes are arranged on the downstream side, respectively, the filtration of the high pressure portion on the upstream side is performed by the ultrafiltration membrane, and the low pressure portion on the downstream side is shared by the microfiltration membrane, that is, the same membrane surface linear velocity (membrane With the above average flow velocity), an ultrafiltration membrane that produces high permeation flux at high pressure and a microfiltration membrane that produces high permeation flux at low pressure will be combined, eliminating clogging.
The present invention has been completed on the basis of the finding that it is possible to process burn-in cages efficiently and while maintaining stable quality.

That is, according to the present invention, a soy sauce burner is attached, an upstream filtration member is provided with an ultrafiltration membrane, and a downstream filtration member is provided with a microfiltration membrane, which are vertically sandwiched in multiple stages. It is a soy sauce burning pouring treatment method characterized by performing a filtration treatment with a plate & frame type membrane filtration machine.

[0010]

Specific means for solving the problems First, the firing orient to which the present invention can be applied is not particularly limited, and the firing orient of all soy sauces such as dark soy sauce, light soy sauce, tamari soy sauce, white soy sauce, low salt soy sauce, etc. Can be applied to. The moromi mash of aged soy sauce is squeezed by a squeezing machine, and the filtrate becomes raw soy sauce. After that, the raw soy sauce is filtered to remove foreign matters, and then heat sterilized, that is, fired by a plate heater.

After this step, soy sauce is allowed to stand in a tank, and a so-called "orienting" step is carried out in which the fired sediment is allowed to settle at the bottom of the tank, and the clarified liquid on the top is collected to obtain a product. Next, the settled fired residue is treated with a filtration membrane, and an ultrafiltration membrane and a microfiltration membrane are used as the filtration membrane.

First, an ultrafiltration membrane, which is arranged upstream of the plate-and-frame type membrane filtration device and is arranged so as not to reduce the filtration amount even when the pouring orient is supplied at high pressure. The molecular weight cut-off is preferably such that the permeated liquid, that is, soy sauce, is not changed in taste component and color tone, and preferably 20,000 MW or more. Specifically, polysulfone film IRIS3026 (manufactured by Rhone Poulin), polysulfone film GR40PPNOVA
(Manufactured by DDS) and the like.

On the other hand, the microfiltration membrane may be of a type capable of removing spores during burning, and preferably has a pore size of 0.5 μm or less. Specifically, Teflon film NTF-5200 (manufactured by Nitto Denko Corporation) can be mentioned.

In carrying out the present invention, FIGS.
The apparatus shown in (1) can be suitably used, 1 is a circulation pump for circulating the firing or stock solution, and 2 is a plate-and-frame type membrane filtration apparatus in which an ultrafiltration membrane and a microfiltration membrane are mounted.

The discharge port 3 of the circulation pump 1 and the stock solution inlet 4 of the plate-and-frame type membrane filtration device 2, the concentrated solution outlet 5 of the filtration device 2 and the stock solution tank 6, and further the stock solution tank 6 and the suction of the circulation pump 1. The ports 7 are connected in communication with each other to form a circulation circuit 8. 9 is a product tank for the filtrate that has passed through the filtration membrane, and is connected to the filtrate outlet 10 of the plate-and-frame type membrane filtration device 2.

Reference numeral 11 denotes a flat plate-shaped filter member, and a filtrate passage 12 is formed on the surface thereof, and the filter members are arranged vertically in multiple stages. A stock solution communication port 20 is formed through the filter member 11 at right angles to the longitudinal direction. In the present embodiment, the stock solution communication ports 20 are provided in a pair in the upper and lower sides because of the parallel circuit, but in the case of the series circuit, the number is one.

Reference numerals 13 and 14 denote sandwich frames, which are filter members 1
The plate-and-frame type membrane filtration device 2 is formed by sandwiching 1 from the left and right in multiple stages. Are installed respectively.

Reference numeral 15 is a partitioning member interposed in the intermediate portion of the filter members 11 arranged in multiple stages, whereby, for example, the right side is divided into the upstream side and the left side into the downstream side. Then, the ultrafiltration membrane 16 is provided on the surface of the filtration member 11 arranged on the upstream side.
The filtration member 11 arranged on the downstream side includes the microfiltration membrane 17
Further, the filtering member 11 is further sandwiched by the pressure-bonding frames 13 and 14 with the packing 18 interposed therebetween, and the gap serves as the stock solution passage 21. In this state, the undiluted solution communication port 20 becomes a continuous passage to form a undiluted solution communication passage 22, and the undiluted solution inlet 4 and the concentrated solution outlet 5 are communicated with each other via the undiluted solution passage 21. 23
Is a communication passage that connects the filtrate passage 12 and the filtrate outlet 10.

[0019]

The fired container stored in the stock solution tank 6 is repeatedly circulated through the circulation circuit 8 through the plate & frame type membrane filtration device 2 by the circulation pump 1. At the time of this distribution, the fired sediment is sequentially filtered by the ultrafiltration membrane 16 and the microfiltration membrane 17 in the plate & frame type membrane filtration device 2,
The filtrate is the filtrate passage 12, the communication passage 23, the filtrate outlet 10.
It is led to the filtered liquid tank 9 through and is collected as a product. The fired residue is gradually concentrated, and the process ends when the specified concentration is reached.

[0020]

Example 1 After burning raw soy sauce by a conventional method, the raw soy sauce was left to stand in a production tank for 5 days to be pulled, and then fired (total nitrogen amount: 1.6).
0%, salinity; 16.6%) to the bottom of the tank,
Collect the top clarified liquid as product. Next, the settled fired sediment (turbidity; 350 ppm) was supplied to the plate-and-frame type membrane filtration device 2 (specification described below) shown in FIGS. 1 and 2 at a circulation rate of 100 L / min, and the average permeated liquid volume per unit area was 32 L / min. Filtration was performed at a ratio of m ² · hr to obtain a filtrate having a turbidity of 0, that is, a product. The supply pressure is at the ultrafiltration membrane inlet,
4.0 kg / cm ² · G, 2.5 k at the microfiltration membrane inlet
It was g / cm ² · G. The concentration was up to 5.0 times.

Specifications of Plate & Frame Type Membrane Filtration Device (1) Ultrafiltration Membrane Fractionation Molecular Weight; 50,000 MW Material: Polysulfone Area: 0.5 m ² × 3 Stages (2) Microfiltration Membrane Pore Size: 0.2 μm Material: Teflon Area: 0.5m ² x 3 layers

[0022]

EFFECT OF THE INVENTION The invention of the present application is constructed as described above, and makes it possible to efficiently perform the filtration treatment of the fired cage, which has been extremely difficult to treat by the plate & frame type membrane filtration device, with stable quality. The soy sauce production process can be simplified.

[0023]

[Brief description of drawings]

FIG. 1 is a process chart of the present invention.

FIG. 2 is a detailed front sectional view of a filtering member.

[0024]

[Explanation of symbols]

 1 Circulation Pump 2 Plate & Frame Type Membrane Filtration Device 4 Undiluted Liquid Inlet 5 Concentrated Liquid Outlet 6 Undiluted Liquid Tank 9 Product Tank 10 Filtrated Liquid Outlet 11 Filtration Member 13,14 Clamping Frame 15 Fractionation Member 16 Ultrafiltration Membrane 17 Microfiltration Membrane

Claims (1)

[Claims] 1. A plate and frame comprising a soy sauce burner bowl, an upstream filtration member having an ultrafiltration membrane and a downstream filtration member having a microfiltration membrane, which are vertically sandwiched. A method for treating a soy sauce burning pot, which comprises performing a filtering treatment with a membrane filter.