公开(公告)号：ES2197566T3

公开(公告)日：2004-01-01

申请号：ES99125633

申请日：1999-12-22

Applicant: PRAXAIR TECHNOLOGY INC

Inventor： ECHEGARAY DIEGO FERNANDEZ ,  VELLOSO ANTONIO AUGUSTO M ,  WAGNER MATTHEW LINCOLN

IPC: C07D201/06 ,  C07D201/10

Abstract: A method for production of caprolactam. The method involves: (a) reacting air with ammonia gas in an ammonia conversion zone to produce nitric oxide; (b) oxidizing at least a portion of the nitric oxide to nitrogen dioxide to produce an NOx-rich process gas stream; (c) reactively absorbing the NOx-rich gas stream with phosphoric acid containing solution in an absorption zone to form nitrate ions; (d) contacting the nitrate ions with air in a degassing zone to produce a nitrate-rich aqueous process stream; (e) reducing the nitrate-rich aqueous stream with hydrogen in the presence of phosphoric acid to produce hydroxylammonium phosphate; (f) oximating the hydroxylammonium phosphate with cyclohexanone to produce cyclohexanone oxime; and (g) converting the cyclohexanone oxime to caprolactam. According to the invention, supplemental oxygen is added downstream of the ammonia conversion zone to increase the quantity and rate of formation of nitrogen dioxide in the NOx-rich process gas stream.

公开(公告)号：DE69902864D1

公开(公告)日：2002-10-17

申请号：DE69902864

申请日：1999-12-22

Applicant: PRAXAIR TECHNOLOGY INC

Inventor： ECHEGARAY DIEGO FERNANDEZ ,  VELLOSO ANTONIO AUGUSTO M ,  WAGNER MATTHEW LINCOLN

IPC: C07D201/06 ,  C07D201/10

Abstract: An improvement in the conventional process for the production of caprolactam. The process involves: (a) reacting air with ammonia gas in an ammonia conversion zone to produce nitric oxide; (b) oxidizing a portion of the nitric oxide to nitrogen dioxide to produce an NOx-rich process gas stream; (c) reacting the NOx-rich stream with ammonium carbonate in a nitriting zone to produce ammonium nitrite; (d) reducing the ammonium nitrite to hydroxylamine diammonium sulfate; (e) hydrolyzing the hydroxylamine diammonium sulfate to hydroxylamine sulfate; (f) oximating the hydroxylamine sulfate with cyclohexanone to produce cyclohexanone oxime; and (g) converting the cyclohexanone oxime to caprolactam. The process is improved by adding supplemental oxygen downstream of the ammonia conversion zone to increase the quantity and rate of formation of nitrogen dioxide in the NOx-rich process gas stream.

公开(公告)号：PL345145A1

公开(公告)日：2001-07-30

申请号：PL34514501

申请日：2001-01-16

Applicant: PRAXAIR TECHNOLOGY INC

Inventor： AKHRAS AMER WAHID ,  WAGNER MATTHEW LINCOLN

IPC: G06F19/00 ,  G01N25/50 ,  G01N33/00 ,  G06G7/48

Abstract: This invention is directed to a method for predicting the flammability of complex mixtures using critical variables of structural groups comprising training data from the critical variables of each structural groups, the critical variables comprising compositional and thermochemical data from each of the structural groups to produce a neural network model; testing the trained data from the neural network model; and validating the trained and tested data from the neural network to accurately predict the flammability limit of an analogous complex mixture having similar structural groups.

公开(公告)号：CA2331262A1

公开(公告)日：2001-07-18

申请号：CA2331262

申请日：2001-01-17

Applicant: PRAXAIR TECHNOLOGY INC

Inventor： AKHRAS AMER WAHID ,  WAGNER MATTHEW LINCOLN

IPC: G06F19/00 ,  G01N25/50 ,  G01N33/00 ,  G06G7/48 ,  G06N3/02 ,  G01N33/22

Abstract: This invention is directed to a method for predicting the flammability of complex mixtures using critical variables of structural groups comprising training data from the critical variables of each structural groups, the critical variables comprising compositional and thermochemical data from each of the structural groups to produce a neural network model; testing the trained data from the neural network model; and validating the trained and tested data from the neural network t.o accurately predict the flammability limit of an analogous complex mixture having similar structural groups.

公开(公告)号：ID25716A

公开(公告)日：2000-11-02

申请号：ID991023

申请日：1999-11-04

Applicant: PRAXAIR TECHNOLOGY INC

Inventor： ECHEGARAY DIEGO FERNANDEZ ,  VELLOSO ANTONIO AUGUSTO M ,  WAGNER MATTHEW LINCOLN

IPC: C07D201/06 ,  C07D201/10 ,  C07D201/00

Abstract: A method for production of caprolactam. The method involves: (a) reacting air with ammonia gas in an ammonia conversion zone to produce nitric oxide; (b) oxidizing at least a portion of the nitric oxide to nitrogen dioxide to produce an NOx-rich process gas stream; (c) reactively absorbing the NOx-rich gas stream with phosphoric acid containing solution in an absorption zone to form nitrate ions; (d) contacting the nitrate ions with air in a degassing zone to produce a nitrate-rich aqueous process stream; (e) reducing the nitrate-rich aqueous stream with hydrogen in the presence of phosphoric acid to produce hydroxylammonium phosphate; (f) oximating the hydroxylammonium phosphate with cyclohexanone to produce cyclohexanone oxime; and (g) converting the cyclohexanone oxime to caprolactam. According to the invention, supplemental oxygen is added downstream of the ammonia conversion zone to increase the quantity and rate of formation of nitrogen dioxide in the NOx-rich process gas stream.

公开(公告)号：BR9904078A

公开(公告)日：2000-10-17

申请号：BR9904078

申请日：1999-09-03

Applicant: PRAXAIR TECHNOLOGY INC

Inventor： ANDERSON JOHN ERLING ,  FRANCIS ARTHUR WELLINGTON JR ,  WAGNER MATTHEW LINCOLN ,  LEGER CHRISTOPHER BRIAN

IPC: B01F23/10 ,  B01J3/00 ,  B01J3/02 ,  B01J12/00 ,  B01J19/00 ,  B01J19/26 ,  C01B32/40

Abstract: The invention comprises a reactor having a source of a first hot reactant gas, a mixing chamber in which said first hot reactant gas mixes with a second reactant gas to form a reactant gas mixture, but wherein substantially no reaction takes place and a reaction zone wherein said mixture undergoes vapor phase reaction. A process for using the reactor is also disclosed.

公开(公告)号：CA2292904A1

公开(公告)日：2000-06-24

申请号：CA2292904

申请日：1999-12-22

Applicant: PRAXAIR TECHNOLOGY INC

Inventor： VELLOSO ANTONIO AUGUSTO M ,  ECHEGARAY DIEGO FERNANDEZ ,  WAGNER MATTHEW LINCOLN

IPC: C07D201/06 ,  C07D201/10 ,  C07D223/10

Abstract: An improvement in the conventional process for the production of caprolactam. The process involves: (a) reacting air with ammonia gas in an ammonia conversion zone to produce nitric oxide; (b) oxidizing a portion of the nitric oxide to nitrogen dioxide to produce an NO x-rich process gas stream; (c) reacting the NO x-rich stream with ammonium carbonate in a nitrating zone to produce ammonium nitrite; (d) reducing the ammonium nitrite to hydroxylamine diammonium sulfate; (e) hydrolyzing the hydroxylamine diammonium sulfate to hydroxylamine sulfate; (f) oximating the hydroxylamine sulfate with cyclohexanone to produce cyclohexanone oxime; and (g) converting the cyclohexanone oxime to caprolactam. The process is improved by adding supplemental oxygen downstream of the ammonia conversion zone to increase the quantity and rate of formation of nitrogen dioxide in the NO x-rich process gas stream.

公开(公告)号：MX9908136A

公开(公告)日：2000-04-30

申请号：MX9908136

申请日：1999-09-03

Applicant: PRAXAIR TECHNOLOGY INC

Inventor： ANDERSON JOHN ERLING ,  FRANCIS ARTHUR WELLINGTON ,  WAGNER MATTHEW LINCOLN ,  LEGER CHRISTOPHER BRIAN

IPC: B01F23/10 ,  B01J3/00 ,  B01J3/02 ,  B01J12/00 ,  B01J19/00 ,  B01J19/26 ,  C01B32/40

Abstract: The invention comprises a reactor having a source of a first hot reactant gas, a mixing chamber in which said first hot reactant gas mixes with a second reactant gas to form a reactant gas mixture, but wherein substantially no reaction takes place and a reaction zone wherein said mixture undergoes vapor phase reaction. A process for using the reactor is also disclosed.

公开(公告)号：BR9802556A

公开(公告)日：2000-04-11

申请号：BR9802556

申请日：1998-07-22

Applicant: PRAXAIR TECHNOLOGY INC

Inventor： PAPAVASSILIOU VASILIS ,  WAGNER MATTHEW LINCOLN ,  DAY ROGER WILLIAM

IPC: C07C67/055 ,  C07D301/08 ,  C07D301/22 ,  B01J23/50

Abstract: This invention is directed to a method for producing ethylene oxide comprising feeding ethylene, high purity oxygen and a ballast gas with a recycle gas in a catalyst filled reactor to form a gaseous mixture; passing the gaseous mixture from the reactor to a recovery unit to selectively separate ethylene oxide and carbon dioxide containing gas; passing at least a portion of the carbon dioxide containing gas to a stripping unit to selectively separate carbon dioxide and a waste gas; passing at least a portion of the waste gas to purge and another portion for recycling as the recycle gas; and recovering ethylene oxide from the recovery unit.

公开(公告)号：CA2243872A1

公开(公告)日：1999-01-24

申请号：CA2243872

申请日：1998-07-22

Applicant: PRAXAIR TECHNOLOGY INC

Inventor： DAY ROGER WILLIAM ,  WAGNER MATTHEW LINCOLN ,  PAPAVASSILIOU VASILIS

IPC: C07C67/055 ,  C07D301/08 ,  C07D303/04

Abstract: This invention is directed to a method for producing ethylene oxide comprising feeding ethylene, high purity oxygen and a ballast gas with a recycle gas in a catalyst filled reactor to form a gaseous mixture; passing the gaseous mixture from the reactor to a recovery unit to selectively separate ethylene oxide and carbon dioxide containing gas; passing at least a portion of the carbon dioxide containing gas to a stripping unit to selectively separate carbon dioxide and a waste gas; passing at least a portion of the waste gas to purge and another portion for recycling as the recycle gas; and recovering ethylene oxide from the recovery unit.