JP2504728B2 - High concentration method of tomato juice - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for highly concentrating tomato juice. Highly concentrated tomato juice is widely used as an intermediate product and final product. The highly concentrated product is required to have the original quality (color, taste, aroma, etc.) of tomato. TECHNICAL FIELD The present invention relates to a method for highly enriching tomato juice, which enables continuous and stable production of highly concentrated products having the original quality of tomatoes.

[0002]

2. Description of the Related Art Conventionally, vacuum concentration has been generally performed as a method for highly concentrating tomato juice. However, this conventional method has a drawback in that the quality deterioration inherent in tomatoes is unavoidable because the conventional method involves phase conversion for evaporating water, although the degree varies depending on the conditions.

Therefore, reverse osmosis concentration has heretofore been carried out and proposed as a method for concentrating tomato juice that does not involve phase conversion and therefore retains the original quality of tomatoes (Japanese Patent Publication No. 59-53824 and Japanese Patent Laid-Open No. 3-21326). ). However, these conventional methods have a drawback that it is difficult to continuously and stably produce highly concentrated tomato juice. In these conventional methods, since the tomato juice is a highly viscous one containing a relatively large amount of pulp, it is not possible to produce a highly concentrated product of Brix of 20% or more from the tomato juice, or it is temporarily Although it is possible to manufacture such a highly concentrated product, since the pressure loss is too large, there are restrictions on the structure of the device or its operation,
Such highly concentrated products cannot be continuously and stably manufactured.

[0004]

The problem to be solved by the present invention is that the conventional high-concentration method deteriorates the original quality of the tomato, or the high-concentrated product of Brix 20% or more is continued from the tomato juice. That is, stable manufacturing is not possible.

[0005]

SUMMARY OF THE INVENTION In the present invention, however, a tomato juice is connected to a first stage unit having a membrane module having a salt rejection of 90% or more and a salt rejection of 3%.
A second stage unit having a membrane module of 0% or less and having a membrane area ratio of 10 to 40% of the first stage unit;
A method for highly concentrating tomato juice, characterized in that permeate from the second-stage unit is returned to the first-stage unit and is passed through in a transient manner to perform reverse osmosis concentration to Brix 20% or more. .

In the present invention, the tomato juice is allowed to flow down to the first-stage unit and the second-stage unit connected in series, and the permeated liquid from the first-stage unit at this time is discarded, The permeate from the stage unit is returned to the first stage unit. The first-stage unit is equipped with a membrane module with a salt rejection rate of 90% or more, and the second-stage unit is equipped with a membrane module with a salt rejection rate of 30% or less. Is set to 10 to 40% of the film area of the first stage unit.

As described above, in the present invention, tomato juice is passed down to the first-stage unit and the second-stage unit connected in series in a transient manner. A circulation system in which a concentrate obtained from the first-stage unit is returned to the first-stage unit or a concentrate obtained from the second-stage unit is returned to the first-stage unit or the second-stage unit is also considered. However, if such a circulation system is adopted, not only the device structure becomes complicated and its operation becomes complicated, but also the control of bacteria becomes difficult, and the highly concentrated product finally obtained is easily contaminated. Become.

Further, in the present invention, the permeated liquid from the first stage unit is discarded and the permeated liquid from the second stage unit is returned to the first stage unit. Salt rejection rate of 9 for the first stage unit
It is equipped with a membrane module with a reverse osmosis membrane of 0% or more, and the liquid that permeates the reverse osmosis membrane with such a high rejection rate contains almost no active ingredient inherent in tomato, so it is discarded. To do. However, the salt rejection rate is 3 for the second stage unit.
It is equipped with a membrane module with a reverse osmosis membrane of 0% or less, and the liquid that permeates the reverse osmosis membrane with such a low blocking rate contains the tomato's original active ingredient. It is returned to the first stage unit for recovery.

Further, in the present invention, the first-stage unit is equipped with a membrane module having a salt rejection rate of 90% or more, and the second-stage unit is equipped with a membrane module having a salt rejection rate of 30% or less. , The membrane area of the second stage unit is the first
It is set to 10 to 40% of the membrane area of the stage unit.
Salt rejection rate of 90% as the membrane module of the 1st stage unit
If less than the tomatoes are used, the tomato's original active ingredients will be lost. Also, when a membrane module of the second-stage unit having a salt inhibition rate of more than 30% is used, the required amount of permeate cannot be obtained and the membrane area needs to be increased, resulting in a large pressure loss as a whole. As a result, it becomes impossible to continuously and stably manufacture highly concentrated products with Brix of 20% or more. If the membrane area of the second-stage unit is less than 10% of the membrane area of the first-stage unit, a highly concentrated product with Brix of 20% or more cannot be manufactured. The pressure loss becomes too large, and it becomes impossible to continuously and stably manufacture highly concentrated products with Brix of 20% or more.

FIG. 1 is a system diagram schematically showing one embodiment of the present invention. The first stage unit 11 and the second stage unit 12 are connected in series. The first-stage unit 11 is equipped with a membrane module 21 having a salt rejection rate of 90% or more, and the second-stage unit 12 is equipped with a membrane module 22 having a salt rejection rate of 30% or less. The membrane area of the unit 12 is 10 to 4 of the membrane area of the first stage unit 11.
It is set to 0%. The tomato juice is passed through the first-stage unit 11 and the second-stage unit 12 in a transient manner, and the permeated liquid from the first-stage unit 11 at this time is discarded,
The permeated liquid from the stage unit 22 is returned to the first stage unit 11.

FIG. 2 illustrates the relationship between the area ratio and the Brix (%) of the concentrate obtained when the film area ratio (%) of the second unit to the first unit is changed in FIG. It is a graph. Here, tomato juice with 5.0% Brix, a first-stage unit equipped with a tubular membrane module with a total membrane area of 15 m ² with a salt rejection rate of 95%, and a tubular membrane module with a salt inhibition rate of 20% were installed. It is continuously flowed down to the second stage unit at 300 liters / hour for 10 hours in a transient manner. As is clear from FIG. 2, when the membrane area ratio of the second-stage unit is less than 10%, the membrane area of the second-stage unit is insufficient and the required amount of permeate cannot be obtained. The above highly concentrated product could not be produced, and conversely, the membrane area ratio of the second stage unit was 4
If it exceeds 0%, the pressure loss due to the second-stage unit becomes too large, and continuous stable operation of the device becomes difficult.
Brix 20% or more highly concentrated products cannot be continuously and stably manufactured.

FIG. 3 shows the relation between the salt rejection rate (Brix (%) of the obtained concentrate) and the salt inhibition rate (%) when the salt rejection rate (%) of the membrane module installed in the second stage unit in FIG. 1 is changed. It is a graph which illustrates. Here, Brix 5.0
% Tomato juice, a salt rejection rate of 99%, a first stage unit equipped with a tubular membrane module having a total membrane area of 15 m ² and a membrane area ratio of 20% for the first stage unit.
To the second-stage unit equipped with the tubular membrane module of 300 liters / hour for 10 hours in a transient manner. As is clear from FIG. 3, if the salt inhibition rate of the second-stage unit is more than 30%, the required amount of permeate cannot be obtained from the second-stage unit, so a highly concentrated product with Brix of 20% or more is produced. You cannot do it.

[0013]

Example According to the system diagram of FIG. 1 described above, tomato juice was reverse osmosis concentrated under the following conditions for 10 hours continuously. We were able to continue the stable production of a highly concentrated Brix 27.8% product that retains the original quality of tomatoes.

Conditions Tomato juice: Brix 5.0%, 20 ° C. Tomato juice supply: 300 liters / hour. First-stage unit: Reverse osmosis membrane with 99% salt rejection (PCI AFC99)
Tubular membrane module with a total membrane area of 2
0.0 m ² . Second stage unit: a tubular membrane module equipped with a reverse osmosis membrane (NTR7410 manufactured by Nitto Denko Corporation) having a salt rejection rate of 10%, a total membrane area of 3.5 m ² . Operating pressure:
50-60 kg / cm ² . Entrance linear velocity of 1st stage unit: 0.6
8 m / sec. Amount of permeate discarded from the first-stage unit: 246
Liter / hour. Entrance linear velocity of second stage unit: 0.3m /
Seconds. Amount of permeated liquid returned from the second stage unit: 68 liters / hour.

[0015]

As is apparent from the above, the present invention described above has an effect that a highly concentrated product of 20% or more Brix having the original quality of tomato can be continuously and stably produced from tomato juice. .

[Brief description of drawings]

FIG. 1 is a system diagram schematically showing an embodiment of the present invention.

FIG. 2 is a graph illustrating the relationship between the area ratio and the Brix (%) of the obtained concentrate when the film area ratio (%) of the second-stage unit to the first-stage unit is changed in FIG.

FIG. 3 exemplifies the relationship between the salt inhibition rate and the Brix (%) of the obtained concentrate when the salt inhibition rate (%) of the membrane module equipped in the second-stage unit in FIG. 1 is changed. Chart to do.

[Explanation of symbols]

11 ... First-stage unit, 12 ... Second-stage unit, 21, 22 ... Membrane module

Claims (1)

(57) [Claims] 1. A first-stage unit comprising tomato juice, which is connected in series with a membrane module having a salt rejection rate of 90% or more, and a membrane module having a salt rejection rate of 30% or less, and 10 to 10 of the first-stage units. While passing the permeate from the second-stage unit back to the first-stage unit to the second-stage unit having a membrane area ratio of 40%, the permeate is allowed to flow through in a transient manner,
A method for highly concentrating tomato juice, which comprises reverse osmosis concentration to 20% or more.