KR101018277B1 - Producing method of carbonated water - Google Patents

Abstract

The present invention relates to a carbonated water production method for re-injecting carbon dioxide according to the following formula.

[expression]

50 psi ≤ AxT ³ + BxT ² + CxT + D ≤ 200 psi

Where

T is the carbon dioxide reinsertion time in sec,

A is a constant from -0.00001 to -0.002,

B is a constant from 0.01 to 0.2,

C is a constant from -1 to -10,

D is a constant from 50 to 150.

The present invention can maintain the carbonic acid concentration in the carbonated water to 0.2% or more even without continuously injecting carbon dioxide during the production of carbonated water has the effect of reducing the amount of carbon dioxide used.

Carbonated water, carbonated water production equipment

Description

Carbonated water production method {PRODUCING METHOD OF CARBONATED WATER}

The present invention relates to a method of preparing carbonated water, and more particularly, to a method of preparing carbonated water, which can maintain a carbonic acid concentration of 0.2% or more even without continuously injecting carbon dioxide.

Recently, a water purifier is not only a function of supplying purified water by simply filtering raw water, but also a water purifier having various functions so that useful components can be added to human beings.

As an example, a product has been released that allows carbonated drinking water to be supplied to the water purifier so that carbonated drinking water can be easily provided when drinking water.

The carbonated water production device is composed of a carbon dioxide gas pressure vessel for storing the initial carbon dioxide gas, and an air supply unit for supplying air through the orifice and when air is supplied through the orifice in the container, bubbles are generated at this time and carbon dioxide gas in the bubble Carbonated water is prepared by supplying

However, the above method has a problem that carbon dioxide is not obtained by dissolving carbon dioxide in water as water is obtained by absorbing carbon dioxide gas.

To solve this problem, a technique of discharging water and carbon dioxide by using a gas separation membrane has been proposed.

The gas separation membrane may be defined as an interphase of a polymer material having a function of selectively restricting the movement of a material between two phases, and according to the recent demand for high purity and high quality products due to industrial advancement and diversification. Separation process is recognized as a very important process, and has become an important research subject in the medical, biochemical and environmental fields as well as in the industrial fields such as chemical industry, food industry and pharmaceutical industry.

As described above, the gas separation using the membrane proceeds according to the principle of selective gas permeation to the membrane. When the gas mixture comes into contact with the membrane surface, the gas component dissolves and diffuses into the membrane. Membrane material will be different from each other, so that carbon dioxide and water are mixed through the gas separation membrane.

However, it is common to produce carbonated water by continuously supplying carbon dioxide regardless of which of the two types of carbonated water production methods. In addition, even if the supply of carbon dioxide is intermittent rather than continuously supplied, there is no data introduced or researched about the optimum supply timing.

Accordingly, the present invention has been made to solve the above problems, an object of the present invention is to maintain the carbonic acid concentration in the carbonated water more than 0.2% even without continuously injecting carbon dioxide carbonic acid water can reduce the amount of carbon dioxide used It is to provide a manufacturing method.

The present invention to achieve the above object

It provides a carbonated water production method for re-injecting carbon dioxide according to the following formula.

[expression]

50 psi ≤ AxT ³ + BxT ² + CxT + D ≤ 200 psi

Where

T is the carbon dioxide reinsertion time in sec,

A is a constant from -0.00001 to -0.002,

B is a constant from 0.01 to 0.2,

C is a constant from -1 to -10,

D is a constant from 50 to 150.

Knowing the optimal carbon dioxide re-insertion time using the formula according to the present invention, it is possible to produce carbonated water having a sufficient carbonic acid concentration of 0.2% or more even with a small amount of carbon dioxide, without continuously injecting carbon dioxide, unlike the conventional art. have.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, and in describing the present invention, if it is determined that the related well-known technology may blur the gist of the present invention, the detailed description thereof will be omitted. do.

The present invention relates to a formula that can calculate the carbon dioxide re-injection time with a simple formula when preparing carbonated water.

[expression]

50 psi ≤ AxT ³ + BxT ² + CxT + D ≤ 200 psi

Where

T is the carbon dioxide reinsertion time in sec,

A is a constant from -0.00001 to -0.002,

B is a constant from 0.01 to 0.2,

C is a constant from -1 to -10,

D is a constant from 50 to 150.

When supplying CO ₂ at a constant pressure, the amount of CO ₂ consumed can be obtained by PV = nRT, where P: input pressure (atm), V: total volume of CO ₂ (V), x: CO ₂ consumed (G), T: Absolute temperature K, R: Gas constant 0.082 (atm · L / K · mol), PV = (x / 44.01) Substituting room temperature 20 ° C (293k) at 0.082 T, PV = 0.55x, V = 0.55x / P. Thus, given the CO ₂ supply pressure P and the total volume V occupied by CO ₂ , the actual consumption of x (g) can be easily obtained.

The amount of CO ₂ in a constant volume at a constant pressure can be easily obtained, but since the CO ₂ is continuously flowing in the carbonated water production apparatus, a CO ₂ meter can be installed to calculate the actual amount of CO ₂ movement. At a constant pressure, the CO ₂ is constantly supplied and the flow actually traveled is constant. Gas separation membranes currently used in carbonated water production equipment flow at 0.525 L / min at 80 psi (5.4 atm) and 0.55 L / min at 100 psi (6.8 atm). Thus, substituting the above equation V = 0.55x / P, the amount of CO ₂ consumed in one minute x is 5.2g (80 psi) and 6.8g (100psi), respectively.

The present inventors have experimentally produced carbonated water, and found that the concentration of carbonic acid in carbonated water does not increase proportionally with the amount of CO ₂ consumed, and from this, carbon dioxide is continuously produced to produce carbonated water having a concentration of 0.2% or more. The inventors have found that carbonated water with a concentration of 0.2% or more can be produced even by periodically injecting on / off instead of injecting, thus completing the present invention.

If CO ₂ is supplied at a constant pressure, the amount of CO ₂ in the volume can be obtained. The total volume V that CO ₂ can occupy is the sum of the space v1 in the membrane module and the volume v2 of the tube from the CO ₂ supply valve to the membrane. V2 is not necessarily a tube, but may be the volume of the corresponding buffer (if using a buffer, include the volume).

In fact, most carbonated water with a concentration of 0.2% or more is widely consumed, and the carbon dioxide supply pressure must be maintained at 50 psi or more in order to produce 0.2% carbonated water. When initial carbonated water extraction, supply CO ₂ and cold water together, close the CO ₂ supply valve, and when the CO ₂ supply pressure drops below 50 psi, open the supply valve to refill it quickly and then close the valve. In this way, experiments were conducted under various conditions to induce the expression of minimizing the amount of carbon dioxide by measuring the carbon dioxide supply pressure and the volume of CO ₂ in the current membrane system, and the results are shown graphically in FIGS.

Figure 1 is a graph showing the pressure drop over time when the amount of carbon dioxide in the buffer at different initial carbon dioxide supply pressure of 80 psi.

Referring to FIG. 1, when the CO ₂ is added in different amounts of 1 to 4 g, the pressure in the buffer decreases at a constant falling curve at the initial pressure of the buffer at 80 psi. There was no difference in the time taken until the pressure of the buffer dropped to 50 psi. From these experimental results, it was found that when CO ₂ was re-injected to maintain the pressure of the buffer at 50 psi or more, it was not necessary to overfeed more than 3g, thereby reducing the amount of CO ₂ supplied. In addition, at a current level of technology, a low amount of CO ₂ supplied at less than 1 g is very difficult to produce 0.2% carbonated water.

2 is a graph showing a drop in pressure with time when the carbon dioxide supply pressures for 1 g of carbon dioxide in the buffer are different. In the case of 70, 80, 90, 100, 150 psi in Fig. 2, respectively, if the pressure drop curve over time is obtained as an equation, the third equation between the re-entry time and the pressure is in turn as follows.

^{y (70 psi) = -0.0004T 3} + 0.0605T 2 - 3.3783T + 68.802

^{y (80 psi) = -0.0005T 3} + 0.0638T 2 - 3.3854T + 78.461

^{y (90 psi) = -0.0006T 3} + 0.0787T 2 - 3.7502T + 87.333

^{y (100 psi) = -0.0006T 3} + 0.0828T 2 - 4.3053T + 97.005

^{y (150 psi) = -0.0013T 3} + 0.1682T 2 - 7.314T + 139.38

In addition, Figure 3 is a graph showing the pressure drop over time when the carbon dioxide supply pressure for each of the 2g of carbon dioxide in the buffer. In the case of 70, 80, 90, 100, 150 psi in Fig. 3, respectively, the pressure drop curve over time is obtained as an equation in order as follows. This can also be expressed as a cubic equation for refeed time. The solution to the third equation is CO2 reinjection time.

^{y (70 psi) = -0.0002T 3} + 0.0368T 2 - 2.5643T + 68.892

^{y (80 psi) = -0.00008T 3} + 0.022T 2 - 2.2451T + 79.354

^{y (90 psi) = -0.0002T 3} + 0.0381T 2 - 2.8687T + 89.644

^{y (100 psi) = -0.0002T 3} + 0.0446T 2 - 3.2906T + 100.45

^{y (150 psi) = -0.0006T 3} + 0.0974T 2 - 5.6443T + 142.1

Therefore, the present inventors have found that the preferred carbon dioxide re-insertion time can be calculated when the carbon dioxide supply pressure is set to 50 psi or more and 200 psi or less through various experiments as described above. It was found that the relationship between the supply pressure and the re-injection time obtained from the experimental results under the conditions was expressed as a curve having a slope very similar to each other.To summarize the experimental data, the supply pressure and re-injection time during the production of carbonated water were Within this range, they were found to be represented by the following cubic equation. In addition, the solution of the third equation is CO2 re-injection time.

[expression]

50 psi ≤ AxT ³ + BxT ² + CxT + D ≤ 200 psi

Where

T is the carbon dioxide reinsertion time in sec,

A is a constant from -0.00001 to -0.002,

B is a constant from 0.01 to 0.2,

C is a constant from -1 to -10,

D is a constant from 50 to 150.

The reason for limiting the carbon dioxide supply pressure to 50 psi or more and 200 psi or less in the present invention is that the carbonic acid concentration in the produced carbonated water is very low when the pressure is supplied to the carbonated water producing apparatus developed so far, under the pressure. Since it is impossible or physically and chemically produced by the carbonated water production apparatus can not withstand the high pressure, the carbon dioxide supply pressure is limited to a preferred example that can be applied at 50 psi or more and 200 psi or less.

In addition, when using the formula of the present invention, the re-injection amount of carbon dioxide is preferably 1g to 5g, it is impossible to produce more than 0.2% carbonated water when supplied less than 1g, the carbonated water concentration is increased in proportion to the amount of carbon dioxide input when supplied more than 5g. No, it is not economical because it is oversupplying carbon dioxide.

A preferred carbonated water production apparatus to which the formula of the present invention is applied will be described with reference to FIG. 4.

As shown in FIG. 4, a storage tank 100 for storing cold water, a gas separation membrane 200 having an inlet 220 and an outlet 240, and cold water of the storage tank 100 are connected to the inlet 220. A pump 300 for supplying, a check valve 260 which is provided to the inlet 220 to prevent backflow pressure, a carbon dioxide supply unit 400 for supplying carbon dioxide to the gas separation membrane 200, and the outlet 240 Is provided in communication with the carbonated water extraction pipe 500 and the carbonated water extraction pipe 500, and the discharge pipe having an auxiliary valve 620 to discharge the initial carbonated water to the outside; And 600.

The storage tank 100 stores the incoming raw water.

The gas separation membrane 200 has the same structure as the known technology, and the inlet 220 is provided at one side and the outlet 240 is provided at the other side to filter the raw water introduced into the inlet 220 through the separator from the inside. After discharging the carbonated water through the outlet 240.

At this time, the gas separation membrane is preferably in the form of hollow fiber in consideration of the carbonic acid production efficiency. As the contact area of carbon dioxide and water increases through a plurality of pores formed in the gas separation membrane, carbon dioxide gas is easily dissolved in water to prepare carbonated water.

The gas separation membrane 200 has a carbon dioxide permeation rate of 0.55 to 4.6 LPM (Liter Per Minute), preferably 0.8 to 1.5 LPM, at a pressure of 1 kgf / cm ² in order to obtain carbonic acid water at an appropriate concentration using a minimum amount of carbon dioxide gas. Apply to be.

If the carbon dioxide permeation rate of the gas separation membrane is less than the above range, the amount of dissolved carbonic acid in the carbonated water cannot exceed 0.2% and thus cannot be used as the carbonated water. On the contrary, when the carbon dioxide permeation amount exceeds the above range, it is not economical to produce a high concentration of carbonated water as compared to the carbon dioxide input amount.

The material of such a gas separation membrane can be used as long as it has the above-described carbon dioxide permeation amount, and the type of the gas separation membrane is not particularly limited in the present invention. Typically polysulfones, polyethersulfones, polycarbonates, polyimides, polyetherimides, polyamides, polyaramids, polybenzimidazoles, or mixtures thereof and the like are possible, but preferably polysulfones are used.

In this case, the gas separation membrane is preferably coated with a hydrophilic polymer on the membrane surface and inside. The hydrophilic polymer may be one known in the art, for example, one selected from the group consisting of polyvinyl alcohol, polyvinylpyrrolidone, polyethylene glycol, and mixtures thereof.

The pump 300 is installed in a flow path connecting the storage tank 100 and the inlet 220 of the gas separation membrane 200 to pump raw water in the storage tank 100 to the gas separation membrane 200. do.

The check valve 260 is provided at the inlet of the gas separation membrane 200 to control the inflow of raw water and to control the pressure flowing back from the gas separation membrane 200.

The carbon dioxide supplying unit 400 includes a carbon dioxide storage container 410, a carbon dioxide supply pipe 420, and a valve 430 so that the gas in the carbon dioxide storage container 410 is converted into carbon dioxide according to the operation of the valve 430. The gas is supplied into the gas separation membrane 200 through the supply pipe 420.

The valve 430 serves to regularly supply carbon dioxide into the gas separation membrane 200.

The on-off valve 520 is provided to the carbonated water extraction pipe 500 connected to the outlet 240, and extracts the carbonated water according to the operation of the on-off valve 520.

The discharge pipe 600 is provided so as to be in communication with the carbonated water extraction pipe 500, and an auxiliary valve 620 is provided on one side to discharge initial carbonated water to the outside.

The auxiliary valve 620, when the initial carbonated water extraction through the carbonated water extraction pipe 500, the carbonated water is caused to explode due to the pressure remaining in the gas separation membrane 200, the auxiliary valve 620 By opening the to discharge only the initial carbonated water through the discharge pipe 600.

In the present invention configured as described above, as shown in FIG. 1, when the carbonated water drinker extracts the carbonated water, the auxiliary valve 620 provided to the discharge pipe 600 is first maintained to maintain an open state for a predetermined time. Then, the carbonated water remaining in the gas separation membrane 200 generates an explosion by the internal pressure and is discharged to the outside through the discharge pipe 600. Thereafter, the auxiliary valve 620 may be closed, and then the carbonated water may be extracted by operating the on / off valve 520 provided in the carbonated water extraction pipe 500.

Another preferred carbonated water production apparatus to which the formula of the present invention is applied is a gas separation membrane 200 having a storage tank 100 for storing cold water, an inlet port 220 and an outlet port 240, as shown in FIG. Pump 300 for supplying the cold water of the storage tank 100 to the inlet 220, the check valve 260 is provided to the inlet 220 to prevent backflow pressure, and the gas separation membrane 200 to the carbon dioxide Carbonated water extraction pipe 500 for supplying the carbon dioxide, and the outlet 240, the carbonated water extraction tube 500 having an opening and closing valve 520 for discharging carbonated water, and the carbonated water extraction tube 500 is provided in communication with the initial carbonated water A discharge pipe 600 having an auxiliary valve 620 to discharge the gas to the outside, a pressure sensor 700 provided to the discharge port 240 for sensing the discharge pressure of the initial carbonated water, and the opening and closing valve 520. In operation, the signal value of the pressure sensor 700 is input and set. Beyond the range of hogap by opening the auxiliary valve 620 comprises a control unit 800 which controls to discharge carbonated water initially.

Here, the storage tank 100, the gas separation membrane 200, the pump 300, the check valve 260, the carbon dioxide supply unit 400, the carbonated water extraction pipe 500, the discharge pipe 600 The same configuration and function as the first embodiment will be omitted below.

The pressure sensor 700 senses this when the discharge pressure of the treated water provided to the discharge port 240 is discharged irregularly and outputs the signal value to the controller 800.

The controller 800 controls various electric and electronic parts such as the pressure sensor 700, the pump 300, the check valve 260, and the valve 430 of the carbon dioxide supply unit 400.

Since the description of the gas separation membrane 200 has been described above, it will be omitted below.

As described above, when the carbonated water drinker operates the opening / closing valve 520 of the carbonated water extraction tube 500 when the carbonated water is extracted, the pressure sensor 700 may include the gas separation membrane ( The carbonated water discharge pressure in the 200 is sensed, and when the discharge pressure is greater than the previously set value, the auxiliary valve 620 of the discharge pipe 600 is opened. Then, the initial carbonated water discharged through the gas separation membrane 200 is discharged through the discharge pipe 600. Thereafter, when the pressure sensor 700 senses a preset carbonated water extraction pressure value, the auxiliary valve 620 is closed and the opening / closing valve 520 is opened to supply carbonated water at a constant pressure to a cup placed by the user. do.

Applicable to carbonated water production equipment.

1 is a graph showing a drop in pressure over time when the amount of carbon dioxide in the buffer is different at an initial carbon dioxide supply pressure of 80 psi.

Figure 2 is a graph showing a drop in pressure over time when the carbon dioxide supply pressure for each 1g of carbon dioxide in the buffer.

Figure 3 is a graph showing the pressure drop over time when the carbon dioxide supply pressure for each of the 2g of carbon dioxide in the buffer.

4 and 5 is a block diagram of a carbonated water production apparatus having a carbonated water optimized extraction system using a gas separation membrane according to the present invention.

<Description of the symbols for the main parts of the drawings>

100: storage tank

200: gas separation membrane

300: pump

400: carbon dioxide supply unit

500: carbonated water extraction tube

600: discharge pipe

700: pressure sensor

800: control unit

Claims (9)

Carbonated water production method for re-injecting carbon dioxide according to the following formula. [expression] 50 psi ≤ AxT ³ + BxT ² + CxT + D ≤ 200 psi Where T is the carbon dioxide reinsertion time in sec, A is a constant from -0.00001 to -0.002, B is a constant from 0.01 to 0.2, C is a constant from -1 to -10, D is a constant from 50 to 150. The method according to claim 1, The amount of carbon dioxide re-injected is carbonated water production method characterized in that 1g to 5g. The method according to claim 1, The carbonated water production method A storage tank for storing cold water; A gas separation membrane having an inlet and an outlet; A pump for supplying cold water of the storage tank to the inlet; A carbon dioxide supply unit supplying carbon dioxide to the gas separation membrane; A carbonated water extraction tube provided at the outlet and having an on / off valve for discharging carbonated water; Carbonated water production method characterized in that it is provided in communication with the carbonated water extraction tube and used in the carbonated water production apparatus having a carbonated water optimization extraction system using a gas separation membrane comprising a discharge pipe having a secondary valve to discharge the initial carbonated water to the outside. . The method of claim 3, The carbonated water production apparatus further comprises a check valve for preventing the reverse flow pressure to the inlet. The method of claim 3, The gas separation membrane, Carbon dioxide permeation amount of 0.55 to 4.6 LPM at a pressure of 1 kgf / cm ² The method of producing carbonated water. The method according to claim 5, The gas separation membrane, Carbon dioxide permeation amount is 0.8 to 1.5 LPM at a pressure of 1 kgf / cm ² The method of producing carbonated water. The method of claim 3, The gas separation membrane, Method for producing carbonated water, characterized in that one selected from the group consisting of polysulfone, polyethersulfone, polycarbonate, polyimide, polyetherimide, polyamide, polyaramid, polybenzimidazole and mixtures thereof. The method of claim 3, The gas separation membrane, Carbonated water production method characterized in that the hydrophilic polymer is coated on the surface and the inside of the membrane. The method of claim 3, The carbonated water production device A pressure sensor provided at the outlet to sense an outlet pressure of the initial carbonated water; And a control unit for controlling the discharge of the initial carbonated water by opening the auxiliary valve when the signal value of the pressure sensor is input when the open / close valve is opened. .

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