KR101196458B1 - Method for manufacturing milk with good flavor - Google Patents

Abstract

The present invention relates to a method for producing flavor-enhanced milk, and more particularly, to a flavor comprising a nitrogen substitution process for directly mixing and dispersing nitrogen gas in a feeding process for supplying crude oil conveyed from a ranch to a crude oil storage tank. It relates to a process for producing enhanced milk.

Crude Oil, Nitrogen Substitution, Freshness, Dissolved Oxygen

Description

Method for manufacturing milk with enhanced flavor {Method for manufacturing milk with good flavor}

The present invention relates to a method for producing flavor-enhanced milk, and more particularly, to a flavor comprising a nitrogen substitution process for directly mixing and dispersing nitrogen gas in a feeding process for supplying crude oil conveyed from a ranch to a crude oil storage tank. It relates to a process for producing enhanced milk.

Off-flavor components and air, especially oxygen in the crude oil is known to act as a factor to inhibit the fresh taste of milk, sulfur compounds produced during the sterilization process, in particular dimethyl sulfide (dimethyl sulfide) damages the taste and flavor of milk.

In order to solve this problem, a process of removing dissolved oxygen contained in milk by removing nitrogen is known, and conventional methods of removing dissolved oxygen in a liquid include an inject method, a physical method such as top flexing, and a chemical using a deoxidizer. There is a method for gas-dissolving dissolved oxygen in a liquid, and a gas-substituting method is performed by blowing a gas to be directly replaced by a pipe or the like into a liquid tank.

A method of dissolving dissolved oxygen with nitrogen gas and disinfecting it, which is used to disperse nitrogen gas directly into milk, and mix and disperse nitrogen gas stored in the nitrogen gas replacement tank at the upper nozzle of milk without mixing nitrogen gas. A method of disinfecting and then dissolving the dissolved oxygen in milk by simultaneously spraying a milk is known (Patent No. 0438252), but the method has a large amount of bubbles in the process of replacing the dissolved oxygen in milk with nitrogen gas. In order to solve this problem, a tank for nitrogen replacement is required, and thus, there is a disadvantage in that an installation cost is increased and a tank installation space is secured.

Therefore, the present inventors have conducted research and efforts to solve the above problems, and when nitrogen gas is directly mixed and dispersed in a feeding process for supplying crude oil transported from a ranch to a crude oil storage tank, the present invention is changed to nitrogen gas without changing the existing process or using a nitrogen replacement tank. The present invention has been completed by discovering that it is possible to replace, and to remove the air bubbles due to the oil stagnation in the crude oil storage tank even after the nitrogen-substituted crude oil is introduced into the crude oil storage tank, thereby producing milk with enhanced flavor. .

The present invention,

In the milk production method consisting of the process of feeding, storing milk, sterilizing, sterilizing milk storage, and filling the crude milk carried from the ranch,

In the feeding process for supplying crude oil transported from the ranch to the crude oil storage tank 4, nitrogen gas is directly mixed and dispersed in the crude oil, and the crude oil mixed and dispersed with nitrogen gas is introduced into the crude oil storage tank 4 to supply the crude oil storage tank. (4) It is characterized by the method of producing flavor-enhanced milk, including a nitrogen replacement process for lowering the dissolved oxygen concentration of crude oil in 2 ppm or less.

The present invention can suppress the growth of aerobic bacteria in the crude oil in the crude oil storage tank without altering the existing process or the use of nitrogen replacement tank in the method of replacing the dissolved oxygen in the crude oil with nitrogen gas, it can block the contact with oxygen There is an advantage to prevent the deterioration of the crude oil. In addition, by injecting nitrogen gas from the line for transferring the sterilized milk to the storage tank and injecting the nitrogen gas into the storage tank to prevent fatty acidization of the milk so that the original fresh taste and flavor of the milk can be survived.

The present invention,

In the milk production method consisting of the process of feeding, storing milk, sterilizing, sterilizing milk storage, and filling the crude milk carried from the ranch,

In the feeding process for supplying crude oil transported from the ranch to the crude oil storage tank 4, nitrogen gas is directly mixed and dispersed in the crude oil, and the crude oil mixed and dispersed with nitrogen gas is introduced into the crude oil storage tank 4 to supply the crude oil storage tank. (4) It is characterized by the production of flavor-enhanced milk, including a nitrogen replacement process for lowering the dissolved oxygen concentration of crude oil in 2 ppm or less.

Further, according to the present invention,

In the process of transferring the sterilized sterilized milk to the storage tank characterized in that the manufacturing method of the flavor-enhanced milk further comprising the step of injecting nitrogen gas to replace the dissolved oxygen with nitrogen gas.

Hereinafter, the present invention will be described in detail.

In the feeding process in which the crude oil of the tank lorry 1 carried from the ranch is supplied to the crude oil storage tank 4 through a pipe, nitrogen gas is directly mixed and dispersed from the nitrogen gas tank 2 to the mixing mixer 3. In the mixer 3, dissolved oxygen of the crude oil velocity is efficiently replaced with nitrogen gas, and the nitrogen-substituted crude oil flows into the crude oil storage tank 4 from the bottom of the crude oil storage tank 4 in the pipe. In this way, not only nitrogen gas is mixed and replaced in the entire crude oil flowing into the crude oil storage tank 4, but also bubbles due to the oil congestion in the crude oil storage tank 4 even after entering the crude oil storage tank 4. By removing the sterilization process can be made smoothly. By injecting nitrogen gas, the dissolved oxygen concentration of crude oil in the crude oil storage tank 4 can be lowered to 2 ppm or less, and the nitrogen gas is 3 to 4 kg / cm ^2. It is preferred to mix and disperse directly into crude oil under pressure.

Nitrogen-substituted crude oil in the crude oil storage tank 4 is passed through the balance tank 5 through the pipe to the sterilizer 7 through the pipe to sterilize the crude oil. In addition, the sterilization oil after the sterilization process in the sterilizer is transferred to the sterilization oil storage tank 10 through a pipe, and nitrogen gas is injected through the pipe before the sterilization oil is introduced into the sterilization oil storage tank 10. The remaining dissolved oxygen of is replaced with nitrogen gas. In addition, it is possible to inject nitrogen gas from the top of the sterilizing oil storage tank 10, through which the dissolved oxygen concentration in the sterilizing oil can be lowered to 1.4 ppm. At this time, the nitrogen gas is preferably injected at a pressure of 1.5 ~ 2.5 kg / cm ² .

Hereinafter, the content of the present invention will be described in detail with reference to Examples, but the scope of the present invention is not limited to the Examples.

Example  One

In order to replace dissolved oxygen (DO) in crude oil with nitrogen gas as an inert gas, nitrogen gas is 0.5 to 4.0 kg / cm ^{2 for} 250 L / min of crude oil, respectively. Injected under pressure, mixed in a spiral nitrogen gas mixer 3 to replace dissolved oxygen in crude oil with nitrogen gas, and the dissolved oxygen in crude oil was measured and the results are shown in Table 1 below.

N ₂ pressure (kg / cm ² ) Crude oil flow rate (L / min) DO before treatment (ppm) DO after treatment (ppm) 0.5 250 10.6 6.7 1.0 250 10.6 5.4 2.0 250 10.6 3.8 3.0 250 10.6 2.0 4.0 250 10.6 1.9 4.0 200 10.6 2.0

As shown in Table 1, the higher the pressure of nitrogen gas mixed with crude oil, the lower the content of dissolved oxygen, and the nitrogen gas pressure is 4.0kg / cm ^2. In the above, the dissolved oxygen content was reduced up to 1.9 ppm.

Example  2

In Example 1, the crude oil obtained by replacing nitrogen gas at a pressure of 3.0 kg / cm ² with respect to 250 L / min of crude oil was sterilized and subjected to nitrogen substitution in order to remove dissolved oxygen remaining in the sterilized milk. To prevent heavy fatty acidization and to maintain the milk's original fresh taste and flavor for a long time to set the optimal conditions.

In order to optimize the secondary nitrogen replacement process conditions, nitrogen gas was injected at 0.5 to 2.5 kg / cm ² pressure into sterilized milk sterilized from crude oil having a dissolved oxygen concentration lower than 2 ppm according to Example 1, followed by spiral nitrogen gas. After mixing in the mixer 9 to replace the dissolved oxygen in the sterilized milk with nitrogen gas, the dissolved oxygen of the sterilized oil was measured and the results are shown in Table 2 below.

N ₂ pressure (kg / cm ² ) Sterilization flow rate (L / min) DO before treatment (ppm) DO after treatment (ppm) 0.5 66.5 2.0 1.9 1.0 66.5 2.0 1.7 1.5 66.5 2.0 1.5 2.0 66.5 2.0 1.4 2.5 66.5 2.0 1.4

As shown in Table 2, the higher the pressure of the nitrogen gas mixed with the sterilizing oil, the more the dissolved oxygen content decreases, so the nitrogen pressure is 2.0kg / cm ² In the above, the dissolved oxygen content was reduced up to 1.4 ppm.

Experimental Example  One

In Example 1 0, 12, 24, 48 hours elapsed while preserving the crude oil and the nitrogen-unsubstituted crude oil nitrogen-substituted nitrogen nitrogen at a pressure of 3.0 kg / cm ² for 250 L / min for 7 hours, 48 hours The change in the number of microorganisms (general bacteria) according to the results are shown in Table 3 below.

division General crude oil Nitrogen substituted oil 0 hours 4,600 groups 4,900 groups 12 hours 4,800 groups 4,900 groups 24 hours 4,800 groups 5,000 Army 36 hours 7,300 groups 5,100 groups 48 hours 9,500 groups 5,100 groups

As shown in Table 3, compared to general crude oil, nitrogen-replacement crude oil showed little change in the number of microorganisms (general bacteria) because nitrogen-substituted oil replaced the dissolved oxygen of crude oil with nitrogen gas to inhibit the growth of aerobic bacteria. .

Experimental Example  2

After replacing crude oil with nitrogen gas according to Example 1 to lower the dissolved oxygen to 2ppm or less, sterilization treatment for 65 ℃, 30 minutes, nitrogen gas 2.0kg / cm ² again Injected under pressure to carry out secondary nitrogen replacement, the dissolved oxygen was lowered to 1.4 ppm or less, and milk was prepared by storing and filling sterilized milk (nitrogen-substituted milk). Sterilization was carried out under the same conditions, and the sterilized oil was prepared by treating the sterilized milk storage tank 10 without nitrogen gas substitution in the process (general milk).

The sensory test on the nitrogen-substituted milk and general milk is shown in Table 4 below. The sensory test showed the results of 15 expert panel personnel with excellent taste, wherein the sensor for the measurement of nitrogen-substituted milk showed the value when the value of normal milk was 0, and the sensory test measured value The higher the value, the better.

division Milk flavor verdure sweetness Local sense Compliment End Aftertaste Comprehensive
preference Plain milk 0 0 0 0 0 0 0 0 Nitrogen substituted milk 0.16 0.15 0.13 0.12 0.18 0.21 0.23 0.21

As shown in Table 4, the nitrogen-substituted milk according to the present invention was particularly excellent in cleanliness and thirsty of aftertaste, compared to general milk, and also showed excellent results in milk flavor, freshness, sweetness, fat, and savoryness.

Experimental Example  3

The results of comparing the content of dimethyl sulfide contained in nitrogen-substituted milk of Experimental Example 2 and general milk are shown in Table 5 below.

Plain milk Nitrogen substituted milk Dimethyl sulfide (ppb) 49 12

As shown in Table 5, the content of dimethyl sulfide to feel the heating odor in the sterilized milk is significantly reduced compared to the general milk to feel fresher than when drinking the nitrogen-substituted milk according to the present invention, drinking Afterwards, I could feel the neatness of aftertaste.

Experimental Example  4

Due to the fatty acidization of milk by dissolved oxygen, the freshness of milk is reduced. As a by-product of fatty acidization, methyl ketones are produced, so the freshness can be confirmed by measuring the content of 2-Butanone, which is a representative substance of methyl ketones.

Therefore, after the nitrogen-substituted milk and general milk of Experimental Example 2 stored at 10 ℃ for 11 days, the content of 2-Butanone is measured and shown in Table 6 below.

division Retention days 0 11 Milk (ppb) 48 63 Nitrogen substituted milk (ppb) 48 49

1 is a process chart showing a nitrogen substitution process according to the present invention.

1: crude oil tank lorry 2: nitrogen supply

3: Mixer 4: Crude oil storage tank

5: balance tank 6: homogenizer

7: Sterilizer 8: Nitrogen Supply Section

9: Mixer 10: Sterilizing oil storage tank

11: nitrogen supply part 12: outlet

Claims (4)

delete delete delete In the milk production method comprising the steps of feeding, storing milk, sterilizing, sterilizing milk storage, and filling the crude milk carried from the ranch, In the feeding process for supplying the crude oil transported from the ranch to the crude oil storage tank 4, nitrogen gas is directly mixed and dispersed at 3 to 4 kg / cm 2 pressure in the crude oil, and the crude oil mixed with the nitrogen gas is dispersed from below. Inflowing into the storage tank (4), The crude oil storage process includes a nitrogen exchange process that lowers the dissolved oxygen concentration of crude oil in the crude oil storage tank 4 to 2 ppm or less without a nitrogen exchange device . After the sterilization process, in the process of transferring the sterilized crude oil to the sterilization oil storage tank 10, the nitrogen gas is injected at a pressure of 1.5 to 2.5 kg / cm 2 to replace dissolved oxygen with nitrogen gas. Sending Method for producing flavor enhanced milk, characterized in that consisting of .

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