Praxair Technology, Inc.

Carl Joseph Heim

Arun Acharya

John Fredric Billingham

Salvatore Giglia

James J Maloney

Thomas R Schulte

Michael Clinton Johnson

Vladimir T Gorjaczkowski

Ravi Prasad

Thomas John Bergman, Jr

Amitabh Gupta

Mark Leonard Malczewski

William E BeVier

Mark J Roberts

Barry Alan Minbiole

James John Carlins

Alfred M Czikk

Eriks Arvids Niparts

Helium is recovered from gas streams containing high concentrations of hydrogen gas and low concentrations of helium gas, such as from the recycle stream from the production of ammonia. The inventive process provides for an integrated process for the recovery of both an enriched helium gas stream product and a high purity hydrogen gas stream product.

Helium recovery process

This invention relates to methods and systems for detecting contaminants that can precipitate and deposit on a workpiece during a carbon dioxide application, especially contaminants that are already present and dissolved in the fresh carbon dioxide fed to the application. One aspect of this invention includes a method of detecting contaminants dissolved in a carbon dioxide stream, including the steps of sampling at least a portion of the carbon dioxide stream to form a carbon dioxide sample; modifying at least one physical condition of the carbon dioxide sample to form an aerosol that includes gaseous carbon dioxide and at least one suspended contaminant; and detecting the number of particles of suspended contaminant in at least a portion of the carbon dioxide sample with at least one particle counter. A system for continuously detecting contaminants dissolved in a carbon dioxide stream is also described.

Method for analyzing impurities in carbon dioxide

Carbon dioxide is purified through the use of catalytic oxidation. Carbon dioxide is exposed to at least one catalyst, oxidizing at least a portion of the nonvolatile organic residues to form purified carbon dioxide that is directed to an application. Carbon dioxide that is in a near-critical, critical, or supercritical phase can be exposed to the catalyst.

Method for moving contaminants from gases

Disclosed are a carbon dioxide purification process and apparatus including (i) an adsorbing step for removing a predetermined amount of hydrocarbons from a carbon dioxide feed gas to reduce the caloric value of the feed stream, and (ii) a catalytic oxidation step located downstream of the adsorbing step for removing residual hydrocarbons from the feed gas by catalytic oxidation.

Method and apparatus for purifying carbon dioxide feed streams

A process and a system for producing helium from a helium-bearing feed gas that is purified in a cryogenic processing unit to produce cryogenic crude helium containing at least 10% helium. The cryogenic crude helium is directly introduced into a thermal swing helium refinery where it is refined. Refrigeration is supplied to the refinery by the cryogenic crude helium from the cryogenic processing unit.

Thermal swing helium purifier and process

A method and system for separating one or more components from gas mixtures uses a moving bed of adsorption material particles under continuous and substantially isobaric pressure conditions. Contaminated gases are likewise purified by removing one or more contaminants therefrom using such a moving bed of adsorption material particles under continuous and substantially isobaric pressure conditions.

Isobaric moving bed continuous gas purifier

A cooling system includes a unit for processing product to be cooled or frozen. A secondary refrigeration loop is connected to this unit and introduces a refrigerant at or near atmospheric pressure into the unit. The secondary refrigeration loop may be open or closed. The secondary loop includes a secondary heat exchanger for cooling the refrigerant. A primary, closed refrigeration loop, operating at a pressure of not less than 2 atmospheres, includes a forward flow path which comprises a primary refrigerant compressor for producing compressed primary refrigerant, a primary heat exchanger for receiving and cooling the compressed primary refrigerant and an expander for further cooling and transferring the compressed refrigerant to the secondary heat exchanger to enable cooling of the secondary refrigerant. The primary loop further includes a return flow path from the secondary heat exchanger to the primary refrigerant compressor and to the primary heat exchanger. The primary heat exchanger thereby provides heat exchange from the return flow path to the forward flow path to accomplish a cooling action.

Cooling system employing a primary, high pressure closed refrigeration

Processes and systems for purifying high purity helium group gas which may have been contaminated with water, oxygen and/or hydrogen during its transmission to customers' sites.

Gas purification system

A process and system for pressurizing a vessel for integrity testing with gas comprising helium, recovering the gas comprising helium, and purifying the gas comprising helium for reuse. The process for purifying the gas stream comprising helium comprises drying the gas stream; separating the dried gas stream in a membrane separator stage into a helium-enriched permeate product stream and a helium-depleted raffinate stream; recovering helium in the raffinate stream in a membrane stripper stage thereby producing a purge stream; and purging water from the dryer with the purge stream.

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Amherst, NY, United States of America

Carl Joseph Heim