Praxair Technology, Inc.

Xuemei Song

Lloyd Anthony Brown

Thomas Thompson

Shawn M Cecula

David C Johnson

William R Gerristead

Ashwini K Sinha

Carl Richenberg

William S Kane

A composition comprising acetylene fluid at least partially solubilized in an improved solvent is described. The improved solvents exhibit non-toxicity and are further characterized by low vapor pressures to minimize solvent carryover during delivery of the acetylene fluid, while retaining suitable acetylene solubilizing capacity.

Solvents for acetylene fluid storage

This invention relates to a novel method and system for dispensing CO2 vapor without over pressurization from a system having multiple containers. The system includes one or more liquid containers and one or more vapor containers. The system is designed to operate in a specific manner whereby a restricted amount of CO2 liquid is permitted into the vapor container through a restrictive pathway that is created and maintained by a shuttle valve during the filling operation so that equalization of container pressures is achieved, thereby allowing shuttle valve to reseat when filling has stopped. During use, a pressure differential device is designed to specifically isolate the vapor container from the liquid container so as to preferentially deplete liquid CO2 from the vapor container and avoid over pressurization of the system until the vapor container becomes liquid dry. The system can be operated so that at least 50% of the CO2 vapor product is dispensed from the vapor container.

Method and system for optimizing the filling, storage and dispensing of carbon dioxide from multiple containers without overpressurization

This invention relates to a novel method and system for dispensing CO2 vapor without over pressurization. The system includes one or more liquid containers and one or more vapor containers. The system is designed to operate in a specific manner whereby a restricted amount of CO2 liquid is permitted into the vapor container through a restrictive pathway that is created and maintained by a shuttle valve during the filling operation so that equalization of container pressures is achieved, thereby allowing shuttle valve to reseat when filling has stopped. During use, a pressure differential device is designed to specifically isolate the vapor container from the liquid container so as to preferentially deplete liquid CO2 from the vapor container and avoid over pressurization of the system until the vapor container. The system is operated so that at least 50% of the CO2 product is dispensed from the vapor container. The system also includes novel control methodology for performing pre-fill integrity checks to ensure safety of subsequent dispensing of CO2 liquid from a source vessel to the onsite CO2 containers.

A dynamic blending system and process to produce a mixture of a desired target concentration with minimal tolerance variation and no waste gas generation is provided. The mixture made from the blending process can be utilized without the need to vent. The inventive system and process enables the ability to perform relatively small adjustments to the concentration of the blended gas mixture. The system and process also includes specifically designed sampling protocols that reduce measurement error.

Dynamic gas blending system and process for producing mixtures with minimal variation within tolerance limits and increased gas utilization

This invention relates in part to a method for preparing a pressure vessel for receiving high purity acetylene at elevated pressure. The method involves providing a porous filler-containing pressure vessel, deep cleaning the porous filler-containing pressure vessel, purifying a solvent, and charging the purified solvent into the deep cleaned, porous filler-containing pressure vessel. The pressure vessel is then charged with high purity acetylene for storage, transport and/or delivery of the high purity acetylene. The high purity acetylene may be useful as a source material for depositing carbon and carbon-containing films in semiconductor applications.

Cylinder preparation for high purity acetylene

This invention relates in part to a process for producing high purity acetylene by withdrawing a crude acetylene stream from a storage source, and passing said stream through an adsorbent bed that contains layered adsorption media to selectively remove moisture, solvent and carbon dioxide from the stream, thereby producing the high purity acetylene. The adsorption media is regenerated in-situ. The high purity acetylene product is useful as a source material for depositing carbon and carbon-containing films in semiconductor applications.

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East Amherst, NY, United States of America

Xuemei Song