Dispense of beverage containing controlled levels of dissolved gas

An apparatus for providing dispense of a beverage under pressure as often as about every 8 to 10 seconds, while maintaining a predetermined quantity of dissolved gas in the beverage, the apparatus comprising:

• (a) a contactor module containing hollow fiber membranes, the module having a gas side and a liquid side;
• (b) means for presenting the beverage at a predetermined pressure on the liquid side in the contactor module;
• (c) a first three-way valve connecting the gas side of the contactor module to either
• (1) a second three-way valve connected to a first gas source to provide either high pressure gas or nominal pressure gas for controlling the pressure of a dissolving gas from the first gas source in the gas side of the contactor module;
• or
• (2) a third three-way valve connected to either the atmosphere or a second nominal pressure gas source for controlling the pressure of a dissolving gas from the second gas source in the gas side of the contactor module;
• and
• (d) means for maintaining the gas containing beverage under pressure until dispense.

A process utilizing a contactor module having a gas side and a liquid side for controlling dissolved gas in a beverage which is dispensed sometimes as often as about every 8 or 10 seconds while maintaining a predetermined quantity of dissolved gas, wherein the beverage is placed in the liquid side of the contactor module under a predetermined pressure, the process which comprises:

• (a) increasing the quantity of dissolved gas in the beverage by applying a gas from a gas source at a pressure from about 60 to about 90 psig to the bores of the hollow fibers for from about 4 to about 8 seconds to obtain a predetermined dissolved level of the gas in bubble-less form in the beverage while continuously maintaining the pressure of the beverage in the contactor module;
• (b) reducing the pressure of the gas to a predetermined level;
• and
• (c) retaining the dissolved gas in bubble-less form in the beverage until dispense is completed into a glass or mug.

A process utilizing a contactor module having a gas side and a liquid side for controlling dissolved gas in a beverage which is dispensed sometimes as often as about every 8 or 10 seconds while maintaining a predetermined quantity of dissolved gas, wherein the beverage is placed in the liquid side of the contactor module under a predetermined pressure, the process which comprises:

• (a) increasing the quantity of dissolved gas in the beverage by applying a first gas from a gas source at a pressure from about 60 to about 90 psig to the bores of the hollow fibers for from about 4 to about 8 seconds to obtain a predetermined dissolved level of the gas in bubble-less form in the beverage while continuously maintaining the pressure of the beverage in the contactor module;
• (b) reducing the pressure of the first gas to a predetermined level;
• (c) when a dispense event begins, substantially immediately removing any residual amount of the first gas from the bores of the hollow fibers;
• (d) controlling the quantity of a second gas dissolved in the beverage by increasing or decreasing the pressure of the second gas in the bores of the hollow fibers by an appropriate amount to obtain the predetermined level of the second gas dissolved in the beverage while continuously maintaining the flow and pressure of the liquid;
• and
• (e) retaining the dissolved level of each gas as the dissolved gas in bubble-less form in the beverage until dispense is completed into a glass or mug.

A process utilizing a contactor module containing hollow fiber membranes having a shell side comprised of the space surrounding the exterior of the hollow fiber membranes and filling the interior of the module and a bore side comprised of the space in the bores of the hollow fibers, for enhancing beer which is dispensed from a tap sometimes as often as about every 8 to 10 seconds while maintaining a predetermined quantity of dissolved nitrogen and dissolved carbon dioxide, wherein beer is placed in the shell side of the contactor module under a predetermined pressure, the process which comprises:

• (a) increasing the quantity of dissolved nitrogen in the beer by applying nitrogen gas from a nitrogen gas source at a pressure from about 60 to about 90 psig to the bores of the hollow fibers for from about 4 to about 8 seconds to obtain a predetermined level of dissolved nitrogen in bubble-less form in the beer while continuously maintaining the pressure of the beer in the contactor module;
• (b) reducing the pressure of the nitrogen gas to about 15 psig;
• (c) when a dispense event begins, substantially removing residual gas from the bores of the hollow fibers;
• (d) increasing or decreasing the quantity of the dissolved carbon dioxide in the beer by increasing or decreasing the pressure of the carbon dioxide in the bores of the hollow fibers by an appropriate amount to obtain the predetermined level of dissolved carbon dioxide in the beverage while continuously maintaining the pressure of the beer;
• and
• (e) retaining the dissolved carbon dioxide and dissolved nitrogen in bubble-less form in the beer until dispense is completed into a glass or mug.