JP2022100695A - Alcoholic beverage production method - Google Patents

Abstract

To provide an alcoholic beverage production method reducing, dissolved oxygen, having freshness, and holding a scent of the alcoholic beverage, especially, a brewing scent which is preferable in brewage such as sake.SOLUTION: A deaerator having a hollow fiber membrane module 16 is used for flowing an alcoholic beverage to a liquid phase part of the hollow fiber membrane module, a gas phase part is held in a negative pressure state, and in the state, a step for flowing a carbon dioxide gas or a carbon dioxide gas and an inactive gas, is executed, in a production method of an alcoholic beverage. A ratio of a dissolved carbon dioxide amount after processing, to a dissolved carbon dioxide amount before processing of the above-mentioned step, is, in a range of 1/500 or greater in terms of mass. In addition, it is preferable that the dissolved oxygen amount in the alcoholic beverage acquired through the step, is in a range up to 10 ppm or lower.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for producing alcoholic beverages.

It has been conventionally known that the generation and coloring of old aroma, which is an unfavorable aroma in alcoholic beverages, especially brewed alcoholic beverages, is derived from the oxidation of alcoholic beverage components. Furthermore, it is known that so-called raw sake, which is not fired at the time of filling, contains about twice as much dissolved oxygen as normal fired sake, and its quality deteriorates faster than fired sake. There is. Therefore, by reducing the dissolved oxygen concentration in alcoholic beverages by using a hollow thread-like or film-type membrane deaerator under reduced pressure, oxidation of alcoholic beverages can be suppressed and favorable quality during production can be maintained for a long period of time. It is known that it can be done (see, for example, Patent Document 1). Further, in order to obtain such an effect, the dissolved oxygen concentration in liquor is as low as possible, for example, it is desirable that it is about 0.5 ppm or less, but the correlation between the dissolved oxygen concentration in liquor and the storage stability of preferable quality. No specific comparative data is shown. Therefore, dissolved oxygen can be degassed under reduced pressure using a membrane degassing device, or by mixing nitrogen gas in a continuous flow using an in-line mixer to reduce the dissolved oxygen to a specific concentration range. Provided is a method for producing brewed liquor, which suppresses deterioration of the taste and color of liquor by long-term storage by suppressing the activity of enzymes in raw liquor (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 6-141840 Japanese Unexamined Patent Publication No. 2000-308482

However, when the dissolved oxygen in alcoholic beverages is degassed under reduced pressure or by using an in-line mixer, carbon dioxide gas (dissolved carbon dioxide) is also reduced at the same time and not only the freshness is lost, but also the aroma of alcoholic beverages, especially sake. There was a problem that "Ginjo scent", which is considered to be a preferable scent, disappears in brewed sake such as.

Therefore, the problem to be solved by the present invention is that it is possible to maintain a fresh scent of alcoholic beverages, especially "Ginjo scent" which is a preferable scent for brewed sake such as sake, while reducing dissolved oxygen. The purpose is to provide a method for producing alcoholic beverages.

As a result of various studies, the inventors of the present application have used a hollow fiber membrane module to reduce dissolved oxygen in alcoholic beverages under negative pressure, and to flow carbon dioxide gas, carbon dioxide gas, and an inert gas from the upstream side. Therefore, they have found that the above problems can be solved, and have come to solve the present invention.

That is, in the present invention, using the degassing device provided with the hollow fiber membrane module, alcohol is poured into the liquid phase portion of the hollow fiber membrane module, and the outlet side of the gas phase portion is held under negative pressure while maintaining the gas phase portion. The present invention relates to a method for producing a liquor having a step of flowing carbon dioxide gas from the inlet side or flowing carbon dioxide gas and an inert gas.

According to the present invention, a method for producing a liquor capable of retaining a fresh scent of liquor, particularly a "ginjo scent" which is a preferable scent for brewed sake such as sake, while reducing dissolved oxygen. Can be provided.

It is a schematic diagram which shows the outline of the apparatus used in the Example of this invention.

Hereinafter, the present invention will be described in detail, but the present invention is not limited to these embodiments. Further, in the method for producing liquor of the present invention, the process of producing liquor, particularly raw liquor (new liquor) by brewing is well known, and thus is omitted. The raw liquor obtained through the brewing step is preferably passed through a filtration device to have a step of removing microorganisms, fine particles and the like remaining in the raw liquor (filtration step). The method for producing alcoholic beverages of the present invention then uses a degassing device having a gas phase portion and a liquid phase portion and having a hollow thread film module capable of exchanging oxygen molecules and carbon dioxide molecules between the gas and liquid. It has a step (deoxidation step) of flowing carbon dioxide gas, or carbon dioxide gas and an inert gas, while flowing alcoholic beverages through the liquid phase portion and keeping the gas phase portion under negative pressure. After that, alcoholic beverages, especially undiluted alcoholic beverages, are transferred to a storage container and stored.

The filtration step is roughly composed of two steps of filtration with activated carbon and filtration with a filter using a filtration device. First, by filtering with activated carbon, the aroma, taste, and color of alcoholic beverages, especially raw alcoholic beverages, in the subsequent process are corrected, and subsequent deterioration is suppressed. Next, by filtering with a filter, microorganisms, fine particles, etc. that were not adsorbed on the activated carbon are removed. Although the filter used at this time depends on the balance with the filtration rate, it is preferable to use a filter having a fineness enough to remove microorganisms that cause contamination with various germs without deteriorating the quality of sake. ..

Next, the deoxidizing step is a step of sending the liquor obtained through the filtration step, preferably the undiluted liquor, to the degassing device provided with the hollow fiber membrane module and flowing it to the liquid phase side of the hollow fiber membrane module. At this time, the gas phase portion flows carbon dioxide gas, or carbon dioxide gas and an inert gas from the inlet side (upstream side) while keeping the outlet side at a negative pressure (less than 0 atm in gauge pressure).

As the degassing device provided with the hollow fiber membrane module that can be used in the present invention, a known one can be used. Examples of such a hollow fiber membrane module include an internal recirculation type hollow fiber membrane module and an external recirculation type hollow fiber membrane module. In any type of module, the gas phase part requires at least two entrances and exits to the module while flowing alcohol into the liquid phase part, and one of them is communicated with the vacuum pump to the outlet side ( Downstream side), and when the vacuum pump is operated, the gas phase part is held under negative pressure. The other side is an inlet side (upstream side) that communicates with a carbon dioxide gas cylinder or a carbon dioxide gas cylinder and an inert gas cylinder, and when carbon dioxide gas or carbon dioxide gas and an inert gas are supplied from the cylinder, carbon dioxide gas or carbon dioxide gas or Carbon dioxide gas and inert gas can flow. In this way, the film is formed from the alcohol by flowing carbon dioxide gas or carbon dioxide gas and an inert gas while flowing the alcoholic beverage into the liquid phase portion of the hollow filament film module and keeping the gas phase portion under negative pressure. It is possible to retain the dissolved carbon dioxide while deoxidizing the dissolved oxygen to the gas phase portion through the gas phase. Of these, the external recirculation type hollow fiber membrane module is superior in processing efficiency to the internal recirculation type hollow fiber membrane module, and can suppress the flow pressure loss of the liquid to an extremely low level, and particularly treats a large amount of alcoholic beverages. Most preferable when doing so.

The hollow fiber membrane used in the hollow fiber membrane module used in the present invention is not particularly limited, but for example, the membrane structure is such that at least a skin layer (dense layer) and a layer having pores (porous layer) are laminated. If so, what is usually used as a degassing module or an intake module can be used without limitation, and further, the following are preferably used.

The material of the hollow fiber membrane used in the present invention is preferably a membrane made of a highly hydrophobic material, and for example, a polyolefin resin such as a poly (4-methylpentene-1) resin is preferable. The film structure is not particularly limited as long as at least a skin layer (dense layer) and a layer having pores (porous layer) are laminated, but is preferably a skin layer (dense layer) and fine. It is preferable that the membrane is an inhomogeneous film in which a support layer having pores (porous layer) is laminated, and further, a skin layer (dense layer) on the outside and a support layer (porous layer) having pores on the inside are laminated. It is more preferable that the membrane is an inhomogeneous film. The pore diameter of the pores is not particularly limited, but may be preferably in the range of more than 0 nm, more preferably 0.1 nm or more, and preferably 100 nm or less, more preferably 50 nm or less.

When an inhomogeneous film in which a skin layer and a support layer having pores are laminated is used as described above, it is preferable because the resin odor can be reduced by contacting the skin layer with the liquid.

The hollow thread film used in the hollow thread film module used in the present invention has an oxygen permeation rate of preferably 0.1 × 10 ^-5 [cm ³ (STP) / cm ² · sec · cmHg] or more, more preferably. Is 0.5 × 10 ^-5 [cm ³ (STP) / cm ² · sec · cmHg] or more, more preferably 0.9 × 10 ^-5 [cm ³ (STP) / cm ² · sec · cmHg] or more. It may be in the range, preferably 5000 × ^10-5 [cm ³ (STP) / cm ² · sec · cmHg] or less, more preferably 500 × 10 ^-5 [cm ³ (STP) / cm ² · sec. It may be in the range of [cmHg] or less, more preferably 100 × ^10-5 [cm ³ (STP) / cm ² · sec · cmHg].

The hollow thread film used in the hollow thread film module used in the present invention has a carbon dioxide permeation rate of preferably 0.1 × 10 ^-5 [cm ³ (STP) / cm ² · sec · cmHg] or more. It is preferably 0.5 × 10 ^-5 [cm ³ (STP) / cm ² · sec · cmHg] or more, and more preferably 0.9 × 10 ^-5 [cm ³ (STP) / cm ² · sec · cmHg] or more. It may be in the range of, preferably 5000 × ^10-5 [cm ³ (STP) / cm ² · sec · cmHg] or less, and more preferably 500 × 10 ^-5 [cm ³ (STP) / cm ² ·. It may be in the range of [sec · cmHg] or less, more preferably 100 × ^10-5 [cm ³ (STP) / cm ² · sec · cmHg]. It is preferable to select a module in the above range because it is possible to suppress the leakage of beverage while improving the air supply performance of the module.

The hollow fiber membrane used in the hollow fiber membrane module used in the present invention has a carbon dioxide and oxygen separation coefficient α = (QCO ₂ : carbon dioxide permeation amount) / (QO ₂ : oxygen permeation amount) = 1 to 10. Those in the range are preferable, those in the range of 1 to 4.5 are more preferable, and those in the range of 3.0 to 4.2 are particularly preferable. Within the range, it is preferable that alcoholic beverages are not substantially permeated, and it is easy to degas the dissolved oxygen amount to a predetermined range and to fill the dissolved carbon dioxide amount to a predetermined range.

The degassing performance and carbon dioxide gas filling performance of the module generally improve as the oxygen permeation rate and carbon dioxide (carbon dioxide) permeation rate of the hollow fiber membrane diaphragm increase, but the liquid permeation rate also increases accordingly. Therefore, it is desirable to select a diaphragm with an excellent balance between both characteristics.

Further, the measurement of the oxygen permeation rate and the carbon dioxide (carbon dioxide) permeation rate and the gas separation coefficient α are easily performed in accordance with ASTM-D1434.

In particular, a hollow fiber inhomogeneous membrane made of a poly (4-methylpentene-1) resin is preferable because it has excellent gas permeability to oxygen, nitrogen, carbon dioxide and the like and has a high water vapor barrier property. The inhomogeneous membrane is described in detail in, for example, Japanese Patent Publication No. 2-382050, Japanese Patent Publication No. 2-54377, Japanese Patent Publication No. 4-15014, Japanese Patent Application Laid-Open No. 4-50053, and Japanese Patent Application Laid-Open No. 5-6656. It is stated.

The structure of the module and the method of filling the hollow fiber membrane may be configured so that eccentricity does not occur in the degassed water. It has been disclosed.

As for the dimensions of the hollow fiber membrane applied to the hollow fiber membrane module used in the present invention, the smaller the outer diameter of the hollow fiber membrane, the larger the membrane area can be obtained even if the diameter of the winding body is small, and therefore, the outer diameter is obtained. The diameter may be preferably in the range of 70 μm or more, more preferably 150 μm or more, and preferably 370 μm or less, more preferably 280 μm or less. On the other hand, the inner diameter of the hollow fiber membrane may be preferably 30 μm or more, more preferably 80 μm or more, and preferably 310 μm or less, more preferably 220 μm or less. The film area is not particularly limited, but may be preferably 0.018 m ² or more, more preferably 0.18 m ² or more, still more preferably 1.8 m ² or more, particularly preferably 7.0 m ² or more, and preferably. May have a range of 400 m ² or less, more preferably 120 m ² or less, still more preferably 40 m ² or less, and particularly preferably 20 m ² or less.

The hollow fiber membrane module used in the present invention has the characteristics that the circumvention of alcoholic beverages flowing in the liquid phase portion can be easily suppressed, the pressure resistance is excellent, the structure is simple, and the production is easy. There are no particular restrictions on the form of the hollow yarn-like sheet, such as a non-woven fabric, knitting, or woven fabric. Is preferably a knit or woven fabric organized as warp or weft. The sheet-like material organized in a bamboo blind shape can be incorporated into the housing in the state of a superposed body, a wound body, and a convergent body. Further, it is possible to take an appropriate shape such as incorporating a three-dimensional structure in which a hollow fiber is twilled around a tubular core.

In the deoxidizing step, the processing flow rate of liquor (liquid phase side) per hollow fiber membrane module is 0.1 [L] from the viewpoint of being able to deoxidize dissolved oxygen in a short time and having excellent productivity during liquor production. A range of [/ min] or more is preferable, a range of 1 [L / min] or more is more preferable, and a range of 100 [L / min] or less is preferable from the viewpoint of handleability of the module, and a range of 10 [L / min] or less is preferable. The range of is more preferable.

In the deoxidizing step, the liquor flowing on the liquid phase side in the hollow fiber membrane module is pressurized by a pump or the like or placed in a storage container such as a tank and pressurized with a gas containing carbon dioxide gas or an inert gas. , It can also be extruded from the storage container and introduced into the hollow fiber membrane module. The pressure for pressurizing alcoholic beverages is not particularly limited as long as it is within the above processing flow rate, but since it can be degassed in a short time, it should be pressurized in the range of 0.001 [MPa] or more as the lower limit. Is preferable, and it is more preferable to pressurize in the range of 0.01 [MPa] or more. On the other hand, from the viewpoint of excellent pressure resistance of the module, it is preferable to pressurize in the range of 1.0 [MPa] or less as the upper limit value, and more preferably in the range of 0.8 [MPa] or less, 0.3. [MPa] It is more preferable to pressurize in the range below.

When the hollow fiber membrane module used in the deoxidization step is an internal recirculation type, the pressure on the outlet side of the hollow fiber membrane outside the hollow fiber membrane (gas phase side) of the internal recirculation type hollow fiber membrane module is kept under reduced pressure, and the above gas is flowed from the inlet side. At the same time, liquid is passed from inside the hollow fiber membrane (liquid phase side) to degas. On the other hand, when the hollow fiber membrane module used in the degassing step is an external recirculation type, the pressure on the outlet side in the hollow fiber membrane (gas phase side) of the external recirculation type hollow fiber membrane module is kept under reduced pressure, and the gas from the inlet side. While flowing, liquid is passed from the outside of the hollow fiber membrane (liquid phase side) to degas. In either case, it is preferable that the liquid phase side is a skin layer (dense layer) and the gas phase side is a layer having pores (porous layer).

The temperature of the liquor at the time of deoxidation is not particularly limited, but is preferably 10 ° C. or higher, more preferably 20 ° C. or higher, preferably 50 ° C. or lower, and more preferably 40 ° C. or lower.

In the deoxidizing step, carbon dioxide gas, or carbon dioxide gas and an inert gas may flow from the module inlet side (upstream side) to the gas phase portion in the hollow fiber membrane of the hollow fiber membrane module. The pressure for flowing carbon dioxide gas, or carbon dioxide gas and an inert gas may be any pressure that can hold the gas phase portion at a negative pressure. That is, it suffices that the pressure at which the carbon dioxide gas or the carbon dioxide gas and the inert gas flow through the gas phase portion is lower than the pressure at which the gas phase portion is evacuated by the vacuum pump.

The total pressure of the gas in the gas phase portion may be a negative pressure (gauge pressure less than 0 atm), preferably -0.3 atm (gauge pressure) or less, more preferably -0.5 atm (gauge pressure). It may be less than or equal to, and the lower limit is not limited, but it is preferably -1 atm (gauge pressure) or more. In the present invention, when the unit conversion from the atmospheric pressure (atm) to "Pa" is required, the standard atmospheric pressure (101,325 Pa) is used.

In the case of carbon dioxide gas, the gas flowing into the gas phase portion is preferably 5 mol% or more, more preferably 50 mol% or more, still more preferably 80 mol% or more. It is particularly preferred that it is 100 mol%, i.e., substantially only carbon dioxide. However, even when a gas other than carbon dioxide is present in the flowing gas, the proportion of oxygen gas is 20 mol% or less, preferably 10 mol% or less, and more preferably 0 mol%. In addition, "only carbon dioxide gas" means that the total pressure and the partial pressure of carbon dioxide gas are equal, and "substantially only carbon dioxide gas" means completely only carbon dioxide gas due to the remaining air remaining at the start. In some cases, it does not mean that the gas (air) other than carbon dioxide is completely removed except in that case.

On the other hand, when the gas to be flowed to the gas phase portion is carbon dioxide gas or an inert gas, it is more preferably 50 mol% or more, further preferably 80 mol% or more, and 100 mol%. That is, it is particularly preferable that the gas is substantially only a mixed gas of carbon dioxide gas and nitrogen gas. However, even when a gas other than a mixed gas of carbon dioxide gas and nitrogen gas is present in the flowing gas, the ratio of oxygen gas is 20 mol% or less, preferably 10 mol% or less, and more preferably 0 mol%. .. In addition, "only the mixed gas of carbon dioxide gas and inert gas" means that the total pressure is equal to the total of carbon dioxide gas partial pressure and inert gas partial pressure, and "substantially carbon dioxide gas and inert gas". "Gas mixed gas only" may not be completely a mixed gas of carbon dioxide gas and inert gas due to the remaining air remaining at the start, but except for that case, it is completely "carbonated gas and inert gas". It means a state in which other gases (air) other than "mixed gas of gas" are removed. Further, the mixing ratio of the carbon dioxide gas and the inert gas in the mixed gas is not particularly limited and may be arbitrary, but the ratio of the partial pressure of the carbon dioxide gas to the total pressure is preferably in the range of 0.1 or more. It may be, and preferably less than 1.

Here, examples of the inert gas include nitrogen gas (nitrogen molecule), gas (molecule) composed of rare gas elements such as helium, neon, and argon, and nitrogen gas is preferable.

In this way, the gas phase portion is held at a negative pressure to remove (deoxidize) dissolved oxygen (molecules) in the liquid phase, while carbon dioxide gas or carbon dioxide gas and inactivity are applied to the gas phase portion. By flowing a gas to suppress the reduction of dissolved carbon dioxide in the liquid phase, the reaction of oxidative enzymes can be suppressed and the reaction with the oxidizable substance can be inhibited. At that time, the dissolved carbon dioxide can be suppressed. By suppressing the reduction in the amount, it is possible to retain the freshness and the aroma (fragrance) of alcoholic beverages, particularly the "ginjo aroma" which is a preferable aroma in brewed alcohol such as carbon dioxide.
The ratio of the amount of dissolved carbon dioxide after the treatment to the amount of dissolved carbon dioxide before the deoxidizing step is preferably 1/500 or more, more preferably 1/100 or more, still more preferably 1/50 or more on a mass basis. , Particularly preferably 1/2 or more, most preferably 0.8 or more, and although the upper limit is not specified, it may be 1 or less.

The amount of dissolved oxygen in the liquor after the deoxidation step treatment, preferably in the undiluted liquor, is not particularly limited, but is preferably in the range of 10 ppm or less, more preferably 4 ppm or less. The lower limit is not particularly limited because a lower value is preferable, but it may be preferably in the range of 0.01 ppm or more, more preferably 0.5 ppm or more.

In the deoxidizing step, the flow rate of the gas on the gas side per hollow fiber membrane module may be appropriately adjusted in the range of 0.1 to 10 times the flow rate of the liquid flowing through the set module. , It is preferable that the amount is appropriately set in the range of 1 to 3 times.

The pressure of the gas flowing into the gas phase portion may be appropriately pressurized by a pump or the like, but when the gas is provided in a pressure vessel such as a cylinder, the pressure is reduced from the pressure inside the cylinder via a pressure adjusting valve. It is preferable to adjust the pressure to a required level and use it. At that time, the negative pressure may be applied at the outlet on the gas phase side of the hollow fiber membrane module.
Further, it is preferable to flow the gas on the gas phase side of the degassing module in the direction opposite to the flow on the liquid phase side.

A device provided with a hollow fiber membrane module, which can be adopted in the present invention, in which liquor is flowed through a liquid phase portion thereof, and carbon dioxide gas or carbon dioxide gas and an inert gas are flown while keeping the gas phase portion under negative pressure. An example is shown in FIG.

First, alcoholic beverages are supplied to the pressure-resistant tank 4 and stored while being appropriately temperature-controlled. With the two-way valve 17 closed, the liquor stored in the tank 4 is extruded by supplying nitrogen gas from the nitrogen gas cylinder 1 to the tank 4 through the gas pipe 3 while adjusting the pressure with the pressure adjusting valve 2. .. Then, it is guided to the inside from the liquid phase side inlet 6 of the hollow fiber membrane module 16 for deoxidation through the liquid passing pipe 5.

Next, while maintaining the closed state of the two-way valve 17, while adjusting the pressure of the pressure adjusting valve 10 from the carbon dioxide gas cylinder 9, carbon dioxide gas is introduced from the gas phase side inlet 12 of the hollow thread film module 16 through the pipe 11. By operating the vacuum pump 15 and depressurizing the inside of the module from the gas phase side outlet 13 of the hollow thread film module 16 through the pipe 14 while keeping the pressure gauge P3 at a negative pressure, the hollow thread film module 16 It is possible to deoxidize the dissolved oxygen while maintaining or suppressing the decrease of the dissolved carbon dioxide amount of the liquor passed through the liquid phase side of the above. After a lapse of a predetermined time, the two-way valve 17 is opened, and the deoxygenated liquor can be stored in the storage container from the supply port 18.
It is also possible to provide a cooling device in a part or all of each of the hollow fiber membrane module 16 and the liquid passing pipes 5 and 8.

In the present invention, the type of alcoholic beverage is not particularly limited, and for example, a beverage having an alcohol content of 1% or more may be used, and the beverage can be diluted to obtain an alcohol content of 1% or more, or dissolved to have an alcohol content. It shall contain powdered beverages that can be made into beverages of 1% or more, and include effervescent liquors such as beer and effervescent liquor, brewed liquors such as sake such as Japanese liquor and fruit liquor such as wine, whiskey and shochu. Distilled liquors and mixed liquors such as liquor can be used, but among them, "raw liquor" (called "burning"), which is said to have a strong "ginjo fragrance (fruit-like)", is a liquor that has never been heat-treated at around 60 ° C. , Especially, it is particularly preferable to apply it to Japanese sake.

As described above, according to the production method of the present invention, not only the amount of dissolved oxygen in liquor can be suppressed by the hollow fiber membrane module, but also the gas phase side is under atmospheric pressure under atmospheric pressure under the circulation of a gas containing carbon dioxide gas. Since it deoxidizes, it is possible to suppress the removal of aroma. As a result, deterioration of aroma, taste, and color can be made less likely to occur. More preferably, the liquor (raw liquor) can retain the aroma, particularly the "ginjo aroma" which is a preferable aroma in brewed sake such as sake, while maintaining the freshness.

Hereinafter, the present invention will be specifically described with reference to Examples, but the present invention is not limited to these Examples.

(Measurement of dissolved gas)
The amount of dissolved oxygen was measured using "B-506" manufactured by Iijima Electronics Co., Ltd. The amount of dissolved carbon dioxide was measured using a "dissolved oxygen (CO ₂ ) meter" manufactured by METTLER TOLEDO.

(Sensory evaluation method and evaluation criteria)
Unless otherwise specified, the evaluation method in this example was as follows.
Regarding the sensory evaluation, Ginjo incense (fruit-like) and freshness were evaluated.
In addition, "Ginjo Kaori" and "Freshness" are Utsunomiya Hitoshi and 3 others, respectively, "Quality evaluation terms and standard samples related to flavor in the sensory evaluation analysis of sake", [online], 2006, Independent Administrative Institution. From the Liquor Research Institute, pages 3 and 4, search date December 7, 2nd year, http://www.nrib.go.jp/data/pdf/seikoumihou.pdf, "Ginjo" in Table 1. It is defined as an evaluation that feels "scent, fruit-like" (codes 110 and 120) and "14. mouthfeel" (code 1460).

The results of the sensory evaluation were obtained by 5 panelists trained using standard samples (50 ml polypropylene centrifuge tube containing 3 g / liter of isoamyl acetate and 1.2 g / liter of ethyl caproate, respectively). The evaluation results are summarized and shown.

The intensity when "Ginjo incense, fruit-like" (codes 110, 120) is sensed is 1 (not felt), 2 (almost not felt), 3 (slightly felt), 4 (feeling), 5 (strong), 6 It was evaluated on a 6-point scale (which feels very strong) and is listed in the "Ginjo Kaori" column in Table 1.

The intensity when "mouthfeel" (code 1460) is sensed is 1 (not felt), 2 (almost not felt), 3 (slightly felt), 4 (feeling), 5 (strong), 6 (very strong feeling). It was evaluated on a 6-point scale and described in the "Freshness" column in Table 1.

(Example 1)
The hollow fiber membrane modules are all made of DIC Corporation "EF-020G-A30" (poly-4 having an asymmetric membrane in which a skin layer (outer layer) and a porous layer having a hollow fiber hole diameter of 5 to 20 nm (inner side) are laminated. -Methylpenten-1 resin hollow fiber membrane) was used, and after washing with ultrapure water for 72 hours before the test, the inside of the module was dried with sterile air. Further, it was washed with clean water (23 ° C.) for 3 minutes.

Using the manufacturing apparatus shown in FIG. 1, deoxidation treatment was performed under the flow of carbon dioxide gas. Sake ("Junmai Daiginjo Sake" manufactured by Laurel Crown Co., Ltd., dissolved oxygen gas concentration (DO value) 8.2 ppm, dissolved carbon dioxide concentration 200 ppm) before degassing was charged in the tank 4 in advance, and the two-way valve 17 was closed. In this state, the pressure valve 3 is opened to adjust the flow of sake from the tank 4 at a flow rate of 4 L / min, and the vacuum pump 15 is operated on the gas phase side, and the carbon dioxide gas cylinder 9 is passed through the pipe 11. Then, carbon dioxide gas (purity 100%) was supplied into the hollow thread film module from the air supply port 12. The carbon dioxide gas was supplied so as to supply air removed by the vacuum pump while adjusting the negative pressure (vacuum degree −88.025 kPa (g)) on the discharge port 13 side. After that, the two-way valve 17 was opened, and the sake was deoxidized in the hollow fiber membrane module 15. The deoxidized sake was poured into the storage container from the supply port 18. Then, the obtained sake (DO value 1.7 ppm, dissolved carbon dioxide concentration 196 ppm after degassing under reduced pressure under carbon dioxide gas flow) was immediately subjected to sensory evaluation. The sensory evaluation results are shown in Table 1.

(Example 2)
In Example 1, instead of the carbon dioxide gas cylinder 9, a mixed gas of carbon dioxide gas and nitrogen gas (molar ratio N ₂ : CO ₂ = 8.7: 1.3) was used for the sake except that the cylinder 9 was replaced. Deoxidization was performed. The obtained sake (DO value 1.0 ppm, dissolved carbon dioxide concentration 190 ppm after degassing under reduced pressure under the flow of carbon dioxide gas and nitrogen gas) was subjected to sensory evaluation. The sensory evaluation results are shown in Table 1.

(Comparative Example 1)
In Example 1, sake was deoxidized in the same manner except that the pressure control valve 10 was closed and the gas was not supplied. The obtained sake (DO value 1.7 ppm, dissolved carbon dioxide concentration 0.1 ppm after degassing under reduced pressure under no gas circulation) was subjected to sensory evaluation. The sensory evaluation results are shown in Table 1.

From the above sensory evaluation analysis, in Comparative Example 1, as a result of deoxidizing by vacuum degassing using a hollow fiber membrane module to reduce dissolved oxygen, both "Ginjo fragrance, fruit-like" and "freshness" were obtained. Diminished. On the other hand, in Examples 1 and 2, the gas phase side of the hollow fiber membrane module was deoxidized by a reduced pressure degassing treatment while only carbon dioxide gas was circulated, resulting in a reduction in dissolved oxygen. , The decrease of "Ginjo scent, fruit-like" could be suppressed or maintained, and "freshness" was maintained.

1 Nitrogen gas cylinder (high pressure container)
2 Pressure control valve 3 Nitrogen gas piping 4 Tank (pressure resistant storage container)
5 Liquid flow piping 6 Module liquid phase inlet 7 Module liquid phase outlet 8 Liquid flow piping 9 Carbon dioxide gas cylinder (high pressure container)
10 Pressure control valve 11 Carbon dioxide gas supply port side piping 12 Module gas phase inlet (carbon dioxide gas supply port)
13 Module gas phase outlet (carbon dioxide exhaust port)
14 Carbon dioxide gas discharge port side piping 15 Vacuum pump 16 Hollow fiber membrane module 17 Two-way valve 18 Supply port P1 Pressure gauge P2 Pressure gauge F1 Flow meter P3 Pressure gauge

Claims (3)

Using a degassing device equipped with a hollow fiber membrane module, liquor is flowed through the liquid phase portion of the hollow fiber membrane module, and carbon dioxide gas or carbon dioxide gas and an inert gas are flown while keeping the gas phase portion under negative pressure. A method for producing alcoholic beverages having a process. The method for producing alcoholic beverages according to claim 1, wherein the ratio of the amount of dissolved carbon dioxide after the treatment to the amount of dissolved carbon dioxide before the treatment in the step is in the range of 1/500 or more on a mass basis. The method for producing alcoholic beverages according to claim 1 or 2, wherein the amount of dissolved oxygen in the alcoholic beverages obtained through the above steps is in the range of 10 ppm or less.

Images