JPS60232074A - Production of powdery soy - Google Patents

Abstract

PURPOSE:To prepare pure powdery soy capable of giving soy having the same quality as the raw soy when reconstituted with hot water, etc., economically, without adding additives, by concentrating the raw soy with a centrifugal thin- layer vacuum concentration apparatus at a low temperature, and drying with a vacuum dryer at a low temperature. CONSTITUTION:The raw soy is supplied from the stock liquid tank 1 to the conical rotor 6 of the vacuum vessel 5 attached to the centrifugal thin-layer vacuum concentration apparatus A. The soy is spread and transferred in the form of a thin layer on the evaporation surface 6' of the rotor 6 by the rotation of the rotor 6, and is heated at a low temperature under reduced pressure to effect the instantaneous concentration. The concentrated soy is discharged from the concentrate discharge tube 12, supplied to the vacuum dryer B, and dried at a low temperature. The obtained powdery soy is delivered from the product outlet port 40.

Description

[Detailed Description of the Invention] The present invention relates to a method for producing powdered soy sauce, which is a pure powdered soy sauce without any additives, and which maintains almost the same quality as the raw soy sauce when returned to hot water etc. This relates to a manufacturing method that allows products to be provided at low cost.

Conventional methods for producing powdered soy sauce include freeze-drying and spray-drying, both of which involve drying raw soy sauce.

Since the freeze-drying method is processed at low temperatures, when the dried powder is returned to water or hot water, it is possible to reproduce the quality almost equivalent to that of the raw soy sauce. What's more, you can make pure powdered soy sauce without any additives. However, the manufacturing cost per unit process is high;
A disadvantage is that the device requires a large area.

In addition, the spray drying method has low manufacturing costs, and if you try to spray and dry the raw soy sauce as it is, it will stick to the inner wall of the drying tower, making it difficult to take out.It will also cause burns on some products.It uses relatively high temperature hot air. Because of this, there are drawbacks such as flavor components moving into the exhaust gas and reducing the product value.In order to overcome these drawbacks, dextrin is added in an amount of about 20% of the dry matter ratio during drying. However, the use of such additives is not only undesirable due to the recent increase in food safety concerns, but also has the drawback that when reconstituted with hot water, the taste, aroma, color, etc. are inferior compared to the raw soy sauce. was unavoidable.

The present invention was made in order to overcome the drawbacks of such conventional production methods. First, raw soy sauce is instantaneously concentrated at low temperature in a centrifugal thin film vacuum concentrator, and then one layer of the soy sauce is concentrated in a vacuum dryer. It is made to dry at once at low temperatures. As a result, it is pure powdered soy sauce with no additives mixed in during manufacturing, and it is reconstituted with warm water! An excellent product that can almost reproduce the taste and aroma of raw soy sauce can be manufactured at a low creative cost.

The present invention will be specifically described below based on illustrated embodiments. Figure 1 schematically shows an apparatus for carrying out the present invention, which is mainly composed of a centrifugal thin film vacuum concentrator A and a vacuum dryer B'e. explain. First, reference numeral 1 denotes a stock solution supply tank, which is connected to a p-centrifugal thin film vacuum concentrator A through a stock solution supply pipe 2, and a crude oil supply pump 3 is provided therebetween.

The centrifugal thin film vacuum concentrator A is equipped with a rotating substantially conical rotor 6 in a vacuum container 5, and a vacuum pump 7 is connected to the vacuum container 5.

A capacitor 8 is installed to separate the sucked exhaust gas into water and water and release it. Further, the substantially conical rotor 6 has a jacket structure in the FF3 section, and a heating medium supply section 9 such as steam is located near the center of the rotor 6.
A liquid collecting groove 10 is formed on the outer periphery, and a drain collecting groove 10' is provided outside the machine from which a vacuum pump 1 is connected.
Connect 1.

Also, the tip of the stock solution supply pipe 2 faces the center of the evaporation surface 6'' on the outside of the roller, and the concentrated solution discharge tube 12 is placed on the periphery.
will be established.

Similarly, in the present invention, IIm is performed in a vacuum and evaporated at a low temperature. At this time, it is necessary to replenish the amount of heat necessary for evaporation, and the temperature of the heating medium such as steam on the heating side is kept constant. It is desirable to maintain the temperature at For this reason, it is possible to add a configuration for controlling the internal pressure of the heating medium system.

That is, FIG. 2 shows this embodiment, and the reference numeral 13 in the figure is an evaporation section to which a heat medium is supplied. In order to supply the heat medium to the evaporation section 13, first, a steam supply pipe 14 is connected to the steam intake port 1 of the evaporation section 13.
Pull out and connect boiler 15 here. As an example, the boiler 15 has an electric heater 16 inside the airtight body.
It is a so-called electric boiler equipped with a heater 16.
8 One kyr and three 121w are used and configured to be switchable.Furthermore, an evaporation chamber 17 is provided above, from which a steam supply pipe 14 is drawn out. Also, a burring tube 18 is pulled out from the evaporation section 13 and introduced into the lower part of the boiler t through a drain pipe 19. Pump 22 is connected. The vacuum pump η is, for example, a water ring type pump capable of sucking a gas-liquid mixture. In addition, a heat medium storage tank 24 is connected to the rear stage of the vacuum pump via a cooler.
The reference numeral 5 is an air supply pipe connected to a vacuum pump n, and the reference numeral 5 is a heat medium supply bus pipe, each of which is provided with a steam pressure control valve 25 and a heat transfer medium amount control valve i. The condenser is, for example, a water pipe 2i arranged in a container, and a condensate pipe 27 extending from the liquid outlet of the condenser 21 to the lower part of the boiler 15 is drawn out. A vacuum pump ρ is installed in the steam pressure adjustment pipe 20.
Install the safety valve section between the and condenser 21. same,
Reference numeral 29 is a sight glass for observing the internal situation;
30 is the return pipe for returning the heat medium from the boiler 151C to the heat medium storage tank, 31 is the atmosphere opening hole with a filter, 3
2 is a thermometer. Furthermore, a degree of vacuum adjustment mechanism is provided in order to maintain the temperature of the steam in the evaporation section 13 constant, and specifically, the electric heater 1 in the boiler 15 is provided with a degree of vacuum adjustment mechanism.
6 is kept constant, a temperature sensor is installed in the evaporation chamber 17 to detect the steam temperature, and an electric control device that calculates based on the change in temperature and its rate of change and outputs a constant control signal is used. , change the opening degree of the steam pressure regulating valve,
Adjust the vacuum level.

Further, as another embodiment, the opening degree of the steam pressure regulating valve 2 may be kept constant, and the amount of heat of the electric heater may be controlled in the same manner as described above. In yet another embodiment, a vacuum gauge (or pressure sensor) 34 is provided in addition to the steam pressure adjustment pipe, and the degree of vacuum is detected by this, and the same control as described above is performed.

The present decorative object 1 has such a configuration, and supplies a heat medium under the following operation. That is, at the beginning of operation, the electric heater 16 of the boiler 15 is energized to heat the heat medium and generate steam, and at the same time the vacuum pump 2
2 to suck the vapor inside the evaporator 13. On the other hand, cooling water is supplied to the condenser 21 and the cooler.

The heat medium condensed by heat exchange in the evaporator 71113 passes through the burring tube 18 and is returned to the boiler 15, and excess steam passes from the evaporator 13 through a steam pressure adjustment pipe to the condenser 21, where it is It is condensed and returned to the boiler 15 via the condensate pipe 27. At this time, the inside of the evaporator 13 is brought into a reduced pressure state by the vacuum pump 22, and therefore the temperature of the steam decreases. Therefore, after the inside of the evaporator reaches a predetermined reduced pressure state, the vapor temperature can be maintained constant through the control of the vapor pressure regulating pulp by the vacuum level regulating mechanism. Similarly, when adjusting the degree of vacuum using an electric heater, it can be carried out by almost the same operation as above.

Furthermore, when adjusting the degree of vacuum by detecting it with a vacuum gauge (or pressure sensor), it can be performed in substantially the same manner as described above.

In this way, in this embodiment, when heating the heat medium to generate steam and performing heat exchange in the evaporation section, the inside of the evaporation section is brought into a reduced pressure state using a vacuum pump, and in this state, the steam temperature is controlled by the vacuum level adjustment mechanism. It is designed to be circulated while being controlled at a constant temperature. This allows a large amount of steam to be supplied at a constant temperature, increasing the amount of heat emitted per unit time on the heat transfer surface, and preventing thermal denaturation. This makes it possible to efficiently and stably heat substances that are susceptible to heat.

Furthermore, the amount of material to be treated that is supplied to the heat transfer surface tends to vary, and therefore the amount of steam required for heating also varies.

In contrast, in this device, the amount of heat from the electric heater is kept constant, steam is generated to match the fluctuations in the object to be treated, and excess steam after heat exchange is condensed in a condenser.
The vacuum drying device B is an example of a band-type continuous vacuum drying device. It shows. The reference numeral 35 is a vacuum container, and a vacuum pump 36 is connected thereto.

An endless flat belt 37 is stretched around the vacuum container 35F'l by a pair of rolls, and one of the rolls is driven to make the belt 37 run. The driving roll may be appropriately equipped with a known transmission that is commercially available to select the running speed of the belt 37.Also, the belt 37 may be provided with a heating plate 38 over a certain length. This device heats each part of the belt under different temperature conditions. For example, the first zone is heated with steam,
The second zone may have a structure in which hot water is passed through it, and the steam, hot water, etc. supplied to each heating plate 38 may be maintained at a required temperature by appropriately attaching a known temperature control device. In addition, the part for supplying the concentrated liquid to the belt 37 is, for example, a swinging nozzle, so that the concentrated liquid is uniformly distributed on the belt, and a product discharge port 40 containing the pulp 39 is formed at the rear end of the belt. . Furthermore, the following devices are added in addition to the above-mentioned devices. That is, a filter 41 is provided between the centrifugal thin film vacuum concentration device 1A and the vacuum drying device B, and pumps 42 and 43 for supplying concentrated liquid are provided before and after the filter 41. Further, an embodiment of the method of the present invention will be described below, in which a pulverizer or a granulator is provided together with the pulverizer (not shown) downstream of the product discharge port 40 of the vacuum drying apparatus B.

First, raw soy sauce (salt concentration 17%)'f: is supplied from the stock solution supply tank 1 to the centrifugal thin film vacuum concentrator A. The device has a heating steam temperature of 100℃ and a vacuum container of about 40 tons.
The operation was carried out under the following conditions: evaporation temperature 40°C, rotor rotation speed 80 Or, and PMB stock solution supply rate 300 t/h. The raw material liquid is supplied to the center of the inner surface of the substantially conical rotor 6, moves along the inner surface of the rotor by the centrifugal force generated by rotation, and forms a thin film V, which collects on the outer periphery in about 1 second and passes through the fixed concentrated liquid discharge tube 7. During this time, the inside of the vacuum container 5 is kept under reduced pressure, and the raw material soy sauce is concentrated while maintaining its quality by staying on the evaporation surface for a short time and evaporating at a low temperature due to reduced pressure. As a result, the raw soy sauce was concentrated 313 times to obtain a concentrated solution with a salt concentration of #56%.
Of the 56% salt, 25% crystallizes and 30% of the salt is present in the concentrate. The crystalline salt was filtered by a filter 41 before being introduced into the band-type continuous vacuum drying apparatus B, and was taken out of the system. Next, the concentrated g containing 30% salt is fed into band-type continuous vacuum drying equipment B. The first stage heating temperature is 120°C, the second stage heating temperature is ω°C, the degree of vacuum is 9 Torr, and the drying time is The vehicle is operated under the following conditions. The concentrated liquid is sent uniformly from an oscillating nozzle via a pump 43,
It adheres to the belt 37 in the form of a thin film, turns into foam on the belt, and is indirectly heated and dried to obtain dry soy sauce of 6.3% WB. Here, too, the heating temperature and evaporation source temperature can be adjusted to the required temperature, and processing at low temperatures is possible without impairing the quality of the raw material soy sauce.

The powdered soy sauce obtained by such a manufacturing method immediately dissolved when reconstituted with warm water and exhibited excellent solubility - the taste, aroma and color were almost the same as the raw soy sauce.

As detailed above, the present invention incorporates a condensation process using a centrifugal thin film vacuum concentrator before the drying process, making it possible to concentrate while maintaining the quality of the raw soy sauce in its entirety.
It is possible to easily dry and powderize concentrated soy sauce without additives.In addition, since the present invention provides a concentration process before the drying process, running costs can be reduced, and pure powdered soy sauce without additives can be produced. It can be provided at low cost.

Furthermore, in the present invention, it is also possible to reduce the salt content, so that it can be used for medical purposes as a low-salt powdered soy sauce.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an embodiment of the apparatus for implementing the present invention, Fig. 2 is a skeletal side view showing an embodiment of the configuration for controlling the internal pressure of the heating medium system, and Fig. 3 is a manufacturing method according to the present invention. It is an explanatory view showing one example of a method. l; Stock solution supply tank A; Centrifugal thin film vacuum concentrator B; Vacuum dryer 41;

Claims (1)

[Claims] A method for producing powdered soy sauce comprising a first step of instantaneously concentrating raw soy sauce at low temperature in a centrifugal thin film vacuum concentrator, and a second step of drying at low temperature in a vacuum dryer.