| Patent Number |
Title Of Patent |
Date Issued |
| 5289688 |
Inter-column heat integration for multi-column distillation system |
March 1, 1994 |
| This invention relates to an improvement in a process for the separation of a multi-component stream by distillation. A multi-component feed is introduced to a multicolumn distillation system comprising a main column and a side column wherein at least a light component A is separated fro |
| 5257504 |
Multiple reboiler, double column, elevated pressure air separation cycles and their integration |
November 2, 1993 |
| The present invention is a liquid nitrogen reflux means improvement capable of allowing the operation of conventional dual and triple reboiler air separation cycles at elevated pressures. The improvement comprises: (a) heat exchanging a portion of the liquid oxygen bottoms of the second |
| 5255524 |
Dual heat pump cycles for increased argon recovery |
October 26, 1993 |
| The present invention relates to an improvement for the production of argon from cryogenic air separation processes. In particular, the improvement comprises using a first heat pump cycle to transfer refrigeration from the bottom of the low pressure column to the top of the crude argon c |
| 5255522 |
Vaporization of liquid oxygen for increased argon recovery |
October 26, 1993 |
| The present invention relates to an improvement for the production of argon from cyrogenic air separation processes. In particular, the improvement comprises satisfying a portion of the crude argon column condensing duty with refrigeration provided from the vaporization of a portion of t |
| 5245831 |
Single heat pump cycle for increased argon recovery |
September 21, 1993 |
| The present invention relates to an improvement for the production of argon from cryogenic air separation processes. In particular, the improvement comprises using a heat pump cycle to transfer refrigeration from the bottom of the low pressure column to the top of the crude argon column |
| 5243078 |
Production of noncyclic polyalkylene polyamines |
September 7, 1993 |
| A process for selectively preparing predominantly noncyclic polyalkylene polyamines wherein one or more linear alkyleneamines are reacted in the presence of a mordenite catalyst under conditions sufficient to effect a disproportionation reaction. Preferably, the catalyst is prepared by |
| 5224336 |
Process and system for controlling a cryogenic air separation unit during rapid changes in produ |
July 6, 1993 |
| A process and system for controlling a cryogenic air separation unit during rapid changes in production. During operation of an air separation unit, demands for oxygen will vary and the pressure of the feed air will fluctuate. The changes in oxygen demand and feed air pressure translate |
| 5218825 |
Coproduction of a normal purity and ultra high purity volatile component from a multi-component |
June 15, 1993 |
| This invention relates to an improved process for the coproduction of a volatile component with normal purity and ultra high purity from a stream containing other heavier components and contaminated with lighter impurities which are more volatile than the volatile component. The impr |
| 5205127 |
Cryogenic process for producing ultra high purity nitrogen |
April 27, 1993 |
| This invention relates to a cryogenic process for the separation of air utilizing an integrated multi-column distillation system wherein an ultra high purity nitrogen product is generated. In the cryogenic distillation separation of air, air is initially compressed, pretreated and cooled |
| 5167125 |
Recovery of dissolved light gases from a liquid stream |
December 1, 1992 |
| This invention relates to an improved distillation process for recovering exceptionally light gases, e.g. hydrogen, neon, and helium from gas streams containing higher boiling components, e.g., nitrogen and C.sub.1-2 hydrocarbons. The improvement resides in partially condensing a vapor |
| 5165245 |
Elevated pressure air separation cycles with liquid production |
November 24, 1992 |
| The present invention relates to an improvement to a cryogenic process for the separation of air into its constituent components. In the process, a distillation column system having at least two distillation columns, a high pressure distillation column and a low pressure column is used; |
| 5159816 |
Method of purifying argon through cryogenic adsorption |
November 3, 1992 |
| This invention relates to an improved process for preparing high purity argon employing a cryogenic adsorptive technique. In the process air is separated into its components and a crude argon feed containing 0.8 mol % oxygen or less and 0.5 mol % nitrogen or less is generated. The crude |
| 5141543 |
Use of liquefied natural gas (LNG) coupled with a cold expander to produce liquid nitrogen |
August 25, 1992 |
| The present invention relates to a process for the liquefaction of a nitrogen stream produced by separating air components, by using the combination of cryogenic distillation with improved refrigeration. Very cold liquefied natural gas (LNG) is employed as refrigerant, with the LNG c |
| 5139547 |
Production of liquid nitrogen using liquefied natural gas as sole refrigerant |
August 18, 1992 |
| The present invention relates to a process for liquefaction of a nitrogen stream produced by a cryogenic air separation unit. Cold liquid natural gas (LNG) is employed as refrigerant.A critical feature step of the invention is that the temperature of the vaporizing LNG should be maintain |
| 5137559 |
Production of nitrogen free of light impurities |
August 11, 1992 |
| This invention relates to a cryogenic process for the separation of air utilizing an integrated multi-column distillation system wherein an ultra high purity nitrogen rich, oxygen rich and optionally an argon rich product are generated. In the cryogenic distillation separation of air, |
| 5137558 |
Liquefied natural gas refrigeration transfer to a cryogenics air separation unit using high pres |
August 11, 1992 |
| The present invention relates to a process for the liquefaction of a nitrogen stream produced by separating air components using the combination of cryogenic distillation with improved refrigeration. Very cold liquid natural gas (LNG) is employed as refrigerant, with the LNG concurre |
| 5129932 |
Cryogenic process for the separation of air to produce moderate pressure nitrogen |
July 14, 1992 |
| This invention relates to a cryogenic process for the separation of air utilizing an integrated multi-column distillation system wherein a nitrogen rich, oxygen rich and argon rich product are generated. In the cryogenic distillation separation of air, air is initially compressed, pr |
| 5123947 |
Cryogenic process for the separation of air to produce ultra high purity nitrogen |
June 23, 1992 |
| This invention relates to a cryogenic process for the separation of air utilizing an integrated multi-column distillation system wherein an ultra high purity nitrogen product is generated. In the cryogenic distillation separation of air, air is initially compressed, pretreated and cooled |
| 5122173 |
Cryogenic production of krypton and xenon from air |
June 16, 1992 |
| The present invention relates to a process for the production of krypton and xenon from a cryogenic air separation unit. The present invention simultaneously concentrates krypton and xenon while rejecting more than 90% of the methane present in the feed stream. The feed to the process is |
| 5114449 |
Enhanced recovery of argon from cryogenic air separation cycles |
May 19, 1992 |
| The present invention relates to an improvement for the production of argon from cryogenic air separation processes. In particular, the improvement provides a better method of thermally linking the top of the crude argon column with the low pressure column. In the improvement, the argon- |
| 5077978 |
Cryogenic process for the separation of air to produce moderate pressure nitrogen |
January 7, 1992 |
| This invention relates to a cryogenic process for the separation of air utilizing an integrated multi-column distillation system wherein a nitrogen rich, oxygen rich and argon rich product are generated. In the cryogenic distillation separation of air, air is initially compressed, pr |
| 5069699 |
Triple distillation column nitrogen generator with plural reboiler/condensers |
December 3, 1991 |
| The present invention is a cryogenic process for the production of nitrogen by distilling air in a double column distillation system comprising a high pressure column and a low pressure column associated functionally with an extra high pressure (EHP) distillation column for added nitroge |
| 5067976 |
Cryogenic process for the production of an oxygen-free and methane-free, krypton/xenon product |
November 26, 1991 |
| The present invention relates to a process for the production of kryton and xenon by using an oxygen-free vapor stream to strip a liquid stream containing oxygen, krypton, methane, and xenon of methane and oxygen. This is accomplished by properly controlling the liquid to vapor flow rati |
| 5063746 |
Cryogenic process for the production of methane-free, krypton/xenon product |
November 12, 1991 |
| The present invention relates to a process for the production of kryton and xenon by using a vapor stream containing greater than 2% oxygen to strip a liquid stream containing oxygen, krypton, methane and xenon of methane. This is accomplished by properly adjusting the liquid to vapor fl |
| 5049173 |
Production of ultra-high purity oxygen from cryogenic air separation plants |
September 17, 1991 |
| The present invention relates to an improvement for the production of ultra-high purity oxygen from cryogenic air separation processes which produce nitrogen and/or commercial purity oxygen products. In particular, the improvement comprises removing or producing an oxygen-containing but |
| 5026912 |
Alkylation of aromatic amines over thermally pretreated zeolites |
June 25, 1991 |
| A process for selectively producing ortho-alkylated aromatic amines in high selectivity relative to N-alkylated aromatic amines. The process comprises reacting an aromatic amine, having at least one hydrogen atom in a position ortho to the amine functionality, and an olefin under conditi |
| 5006139 |
Cryogenic air separation process for the production of nitrogen |
April 9, 1991 |
| The present invention is a cryogenic process for the production of nitrogen by distilling air in a double column distillation system comprising a high pressure column and a low pressure column. The critical step of the invention is the condensation of two nitrogen streams at different |
| 5006137 |
Nitrogen generator with dual reboiler/condensers in the low pressure distillation column |
April 9, 1991 |
| The present invention is a cryogenic process for the production of nitrogen by distilling air in a double column distillation system comprising a high pressure column and a low pressure column. The critical step of the invention is the condensation of a nitrogen stream in the top most |
| 4994098 |
Production of oxygen-lean argon from air |
February 19, 1991 |
| The present invention is an improvement to a method of producing crude argon directly from the cold box of a cryogenic air separation unit. The improvement is the production of crude argon containing greatly decreased concentrations of oxygen, i.e. <0.5% oxygen without any loss in rec |
| 4983194 |
Production of high purity argon |
January 8, 1991 |
| A process for making high purity argon is disclosed in which crude argon containing less than about 0.8 mol % oxygen is recovered from air in a cryogenic distillation system, the crude argon is purified by removing oxygen in a getter system, and other impurities are removed by cryogenic |
| 4947649 |
Cryogenic process for producing low-purity oxygen |
August 14, 1990 |
| This invention relates to an improved cryogenic separation process employing a single pressure distillation column for the recovery of low purity, high pressure oxygen. The process uses two working fluids, i.e., high pressure air and high pressure nitrogen to effect reboil in the col |
| 4936099 |
Air separation process for the production of oxygen-rich and nitrogen-rich products |
June 26, 1990 |
| The present invention is an improvement to a two distillation column, cryogenic air separation process which produces nitrogen-rich and oxygen-rich products. The improvement to the process is condensing at least a portion of the nitrogen overhead from the high pressure column in a re |
| 4927441 |
High pressure nitrogen production cryogenic process |
May 22, 1990 |
| The present invention is a cryogenic process to produce medium to high pressure gaseous nitrogen without the use of a nitrogen product compressor. The process is an improvement to a conventional nitrogen generator with waste expander. The present invention reboils crude liquid oxygen |
| 4914237 |
Alkylation of toluenediamine and para-phenylenediamine with isobutylene in the presence of acidi |
April 3, 1990 |
| This invention relates to an improvement in a fixed bed process for producing tert-butyl-derivatives of aromatic amines, e.g., para-phenylenediamine and toluenediamine by the reaction of isobutylene with the corresponding aromatic diamine in the presence of a highly acidic crystallin |
| 4876377 |
Alkylation of aromatic amines with olefins on partially dealuminated zeolites |
October 24, 1989 |
| This invention pertains to an improved process for the alkylation of aromatic amines. The improvement resides in the use with particular aromatic amines and olefins a catalyst which is a highly acidic partially dealuminated zeolite having an increased silica to alumina molar ratio ov |
| 4872893 |
Process for the production of high pressure nitrogen |
October 10, 1989 |
| A process is set forth for recovery of nitrogen from a feed gas stream, containing nitrogen and oxygen, using a cryogenic separation wherein a recycle stream having an oxygen content above that of the feed gas stream is recycled from the cryogenic separation to the feed gas stream withou |
| 4834956 |
Process for the production of high purity argon |
May 30, 1989 |
| The present invention is a process for producing a high-purity argon stream from a feed gas containing nitrogen, oxygen and at least 85 mole % argon, Nitrogen is absorbed from the stream followed by catalytic hydrogenation to remove oxygen. The absorption column is regenerated at a prese |
| 4817392 |
Process for the production of argon |
April 4, 1989 |
| The present invention is a process for the production and recovery of an O.sub.2 -lean argon stream from a gas mixture containing argon and oxygen. The argon-containing gas mixture is initially treated in a cryogenic separation unit to produce a crude argon stream having an argon con |
| 4717407 |
Process for recovering helium from a multi-component gas stream |
January 5, 1988 |
| The present invention involves an efficient process for recovering helium from a gas mixture containing helium and at least one other component. Separation is effected by integrating a semi-permeable membrane-based unit with a non-membrane type separation unit. |
| 4715873 |
Liquefied gases using an air recycle liquefier |
December 29, 1987 |
| Liquid nitrogen, oxygen and/or argon is produced from a cryogenic distillative separation efficiently and economically wherein at least a portion of the liquid air feed bypasses the distillation column and is used to liquefy the gaseous product of the column, and the recycle air stre |
| 4705548 |
Liquid products using an air and a nitrogen recycle liquefier |
November 10, 1987 |
| Liquid nitrogen, oxygen and/or argon are produced from a cryogenic distillative separation efficiently and economically using a combination of air recycle and nitrogen recycle to produce a liquid product. |
| 4701187 |
Process for separating components of a gas stream |
October 20, 1987 |
| The present invention is a process for separating and recovering a component from a multi-component feed gas mixture. The feed gas mixture is initially separated in a membrane separation unit or units to produce a gas stream concentrated in the desired component. The concentrated gas |
| 4662918 |
Air separation process |
May 5, 1987 |
| A process is set forth for the separation of air by cryogenic distillation in a single column to produce a nitrogen product and an oxygen-enriched product. In the process, at least a portion of the nitrogen product is compressed and recycled to provide reboil at the bottom of the dis |
| 4662917 |
Process for the separation of air |
May 5, 1987 |
| A process is set forth for the separation of air by cryogenic distillation in a single column to produce a nitrogen product and an oxygen-enriched product. In the process, at least a portion of the nitrogen product is compressed and recycled to provide reboil at the bottom of the dis |
| 4662916 |
Process for the separation of air |
May 5, 1987 |
| A process is set forth for the separation of air by cryogenic distillation in a single column to produce a nitrogen product and an oxygen-enriched product. In the process, at least a portion of the nitrogen product is compressed and recycled to provide reboil at the bottom of the dis |
| 4654063 |
Process for recovering hydrogen from a multi-component gas stream |
March 31, 1987 |
| The present invention involves an efficient process for recovering hydrogen from a gas mixture containing hydrogen and at least one other component. Separation is effected by integrating a semi-permeable membrane based unit with a non-membrane type separation unit. |
| 4595405 |
Process for the generation of gaseous and/or liquid nitrogen |
June 17, 1986 |
| The present invention involves an efficient process for separating components of a gas stream by integrating a cryogenic separation unit and a membrane separation unit. One embodiment provides for the generation of one or more nitrogen-rich streams in the gas or liquid phase, or both, |
| 4543115 |
Dual feed air pressure nitrogen generator cycle |
September 24, 1985 |
| A nitrogen generating air separation system is disclosed having dual air feeds to dual, low and high pressure, distillation columns wherein a reboiler-condenser is mounted overhead of the high pressure column and a vaporizer-condenser is mounted overhead of the low pressure column and |
| 4464188 |
Process and apparatus for the separation of air |
August 7, 1984 |
| A process and apparatus is set forth for the separation of air by cryogenic distillation in a rectification column using two nitrogen recycle streams and a sidestream of the feed air stream to reboil the column. One of the nitrogen recycle streams is expanded to provide refrigeration and |
