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This invention concerns an apparatus and a method for producing carbonated water capable of obtaining high concentration carbonated water effectively. Carbon dioxide gas is passed through a first carbon dioxide gas dissolver composed of a membrane module to be dissolved in water and the carbonated w

This invention concerns an apparatus and a method for producing carbonated water capable of obtaining high concentration carbonated water effectively. Carbon dioxide gas is passed through a first carbon dioxide gas dissolver composed of a membrane module to be dissolved in water and the carbonated water passing through the first carbon dioxide gas dissolver is passed through a static mixer, which is a second carbon dioxide gas dissolver. Consequently, a high concentration carbonated water can be obtained remarkably, effectively and easily with a simpler structure than conventionally.

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What is claimed is: 1. An apparatus for producing carbonated water, comprising: carbon dioxide gas supplying means; water supplying means and/or water circulating means; a first carbon dioxide gas dissolver connected to the carbon dioxide gas supplying means and the water supplying means and/or the

What is claimed is: 1. An apparatus for producing carbonated water, comprising: carbon dioxide gas supplying means; water supplying means and/or water circulating means; a first carbon dioxide gas dissolver connected to the carbon dioxide gas supplying means and the water supplying means and/or the water circulating means; and a second carbon dioxide gas dissolver connected to a carbonated water discharging side of the first carbon dioxide gas dissolver, wherein the carbon dioxide gas supplying means is connected to only the first carbon dioxide gas dissolver; the first carbon dioxide dissolver includes a membrane module; and the second carbon dioxide gas dissolver includes a static mixer. 2. The apparatus for producing carbonated water according to claim 1, wherein the membrane module includes a hollow fiber membrane. 3. The apparatus for producing carbonated water according to claim 1, wherein the hollow fiber membrane is a three-layer composite hollow fiber membrane in which both faces of a thin non-porous gas permeation layer are sandwiched by porous layers. 4. The apparatus for producing carbonated water according to claim 1, wherein the static mixer is a stator type and/or a Kenics type. 5. The apparatus for producing carbonated water according to claim 1, wherein a number of elements in the static mixer is 5 to 100. 6. The apparatus for producing carbonated water according to claim 1, wherein an element diameter of the static mixer is 5 to 100 mm. 7. The apparatus for producing carbonated water according to claim 1, wherein carbon dioxide gas flow rate control means is disposed downstream of the carbon dioxide gas supplying means and upstream of the first carbon dioxide gas dissolver. 8. The apparatus for producing carbonated water according to claim 1, wherein water flow rate control means is disposed upstream of the first carbon dioxide gas dissolver. 9. The apparatus for producing carbonated water according to claim 1, wherein a pressure increasing pump is disposed upstream of the first carbon dioxide gas dissolver. 10. The apparatus for producing carbonated water according to claim 9, wherein a start/stop flow switch of the pressure increasing pump is disposed in a line of the carbonated water producing apparatus, through which water or carbonated water passes. 11. The apparatus for producing carbonated water according to claim 1, wherein a liquid-vapor separator for separating carbonated water and non-dissolved carbon dioxide gas is disposed downstream of the second carbon dioxide gas dissolver. 12. The apparatus for producing carbonated water according to claim 11, wherein a bubble sensor is disposed downstream of the liquid-vapor separator. 13. The apparatus for producing carbonated water according to claim 12, wherein the bubble sensor is of ultrasonic type. 14. The apparatus for producing carbonated water according to claim 1, further comprising a carbon dioxide gas concentration sensor and/or an oxygen concentration sensor.