公开(公告)号：JP2003238498A

公开(公告)日：2003-08-27

申请号：JP2003035289

申请日：2003-02-13

Applicant: BAYER AG

Inventor： DEMUTH RALF ,  GOTTA MATTHIAS ,  LINN THOMAS ,  WEBER HANS-MARTIN ,  ZIERNGIEBL EBERHARD

IPC: C07C201/08 ,  C07B61/00 ,  C07C205/12

Abstract: PROBLEM TO BE SOLVED: To provide a method for continuously producing nitrochlorobenzene enabling an easy waste treatment and recycling of waste acid, enabling the yield of o-nitrochlorobenzene of an objective product, and reducing m- nitrochlorobenzene of an undesired byproduct. SOLUTION: The method for continuously producing the nitrochlorobenzene by reacting chlorobenzene, phosphoric acid, nitric acid and water comprises (a) introducing the chlorobenzene, the sulfuric acid, the phosphoric acid and the water simultaneously or successively in an arbitrary order into a reactor having a mixing element, and mixing them so that the temperature of the reaction mixture is 10-80°C during the initial mixing, (b) regulating the content of the phosphoric acid in the reaction mixture based on the total of the sulfuric acid, the phosphoric acid, and nitric acid and the water during the mixing is 10-50%, (c) letting the reaction to progress under an adiabatic condition, (d) separating crude nitrochlorobenzene from the waste acids at the outlet of the reactor, and (e) subjecting the waste acids to recondensation and recycling the condensed acid to a nitration reaction. COPYRIGHT: (C)2003,JPO

公开(公告)号：JP2002338529A

公开(公告)日：2002-11-27

申请号：JP2002101189

申请日：2002-04-03

Applicant: BAYER AG

Inventor： GOTTA MATTHIAS ,  DEMUTH RALF ,  ZIRNGIEBL EBERHARD DIPL CHEM D ,  WEBER HANS-MARTIN ,  RONGE GEORG

IPC: C07C201/08 ,  C07B61/00 ,  C07C201/06 ,  C07C205/06

Abstract: PROBLEM TO BE SOLVED: To provide a continuous isothermal process for preparing mononitrotoluene in the presence of a mixed acid component comprising a mixture of sulfuric acid and phosphoric acid with concentration of the resultant waste acid and recycling of the concentrated waste acid to the process. SOLUTION: (i) About 60-70% strength nitric acid and toluene are fed into a reactor and (ii) crude nitrotoluene is separated from the waste acid at a reactor outlet. (iii) The waste acid containing sulfuric acid, phosphoric acid and water is concentrated in a single-stage concentration to respective specific concentrations and (iv) the concentrated waste acid is recycled back to the reactor in a circuit to undergo a nitration reaction.

公开(公告)号：CZ20021182A3

公开(公告)日：2002-11-13

申请号：CZ20021182

申请日：2002-04-04

Applicant: BAYER AG

Inventor： GOTTA MATTHIAS ,  DEMUTH RALF ,  ZIRNGIEBL EBERHARD ,  WEBER HANS-MARTIN ,  RONGE GEORG

IPC: C07C201/08 ,  C07B61/00 ,  C07C201/06 ,  C07C205/06

Abstract: Continuous, isothermal production of mononitrotoluene by reaction of toluene with HNO3, H2SO4 and H3PO4 is such that the latter two acids are introduced as a mixture of H2SO4 (45-80 wt.%), H3PO4 (9-45 wt.%) and water (5-15 wt.%), i.e. as a single component.

公开(公告)号：PL353194A1

公开(公告)日：2002-10-07

申请号：PL35319402

申请日：2002-04-04

Applicant: BAYER AG

Inventor： GOTTA MATTHIAS ,  DEMUTH RALF ,  ZIRNGIEBL EBERHARD ,  WEBER HANS-MARTIN ,  RONGE GEORG

IPC: C07C201/08 ,  C07B61/00 ,  C07C201/06 ,  C07C205/06

Abstract: Continuous, isothermal production of mononitrotoluene by reaction of toluene with HNO3, H2SO4 and H3PO4 is such that the latter two acids are introduced as a mixture of H2SO4 (45-80 wt.%), H3PO4 (9-45 wt.%) and water (5-15 wt.%), i.e. as a single component.

公开(公告)号：CA2380159A1

公开(公告)日：2002-10-06

申请号：CA2380159

申请日：2002-04-03

Applicant: BAYER AG

Inventor： GOTTA MATTHIAS ,  ZIRNGIEBL EBERHARD ,  WEBER HANS-MARTIN ,  DEMUTH RALF ,  RONGE GEORG

IPC: C07C201/08 ,  C07B61/00 ,  C07C201/06 ,  C07C205/06

Abstract: The present invention relates to a continuous isothermal process for preparing mononitrotoluenes in the presence of a mixed acid component comprising mixtures of sulfuric acid and phosphoric acid with concentration of the resultant waste acid and recycling of the concentrated waste acid to the process.

公开(公告)号：DE10205855A1

公开(公告)日：2003-08-21

申请号：DE10205855

申请日：2002-02-13

Applicant: BAYER AG

Inventor： DEMUTH RALF ,  GOTTA MATTHIAS ,  LINN THOMAS ,  WEBER HANS-MARTIN ,  ZIRNGIEBL EBERHARD

IPC: C07C201/08 ,  C07B61/00 ,  C07C205/12

Abstract: A method for the continuous production of nitrochlorobenzene by nitration of chlorobenzene with a mixture of sulfuric, phosphoric and nitric acids and water under adiabatic conditions comprises: (1) mixing the reactants at 10-80 degrees C using a phosphoric acid content of 10-50 wt%; (2) separating the products at the reactor outlet; and (3) concentrating waste acids for recycling. A method for the continuous production of nitrochlorobenzene (I) comprises: (1) feeding chlorobenzene, sulfuric acid, phosphoric acid, nitric acid and water simultaneously or in any sequence into a stirred reactor and mixing at an initial temperature of 10-80 degrees C; (2) using a mixture with a phosphoric acid content (based on all acids and water) of 10-50 wt%; (3) carrying out the reaction under adiabatic conditions; (4) separating crude (I) from the waste acids at the reactor outlet; and (5) concentrating and recycling the acids to the nitration reaction.

公开(公告)号：HK1051180A1

公开(公告)日：2003-07-25

申请号：HK03103447

申请日：2003-05-15

Applicant: BAYER AG

Inventor： GOTTA MATTHIAS ,  DEMUTH RALF ,  ZIRNGIEBL EBERHARD ,  WEBER HANS-MARTIN ,  RONGE GEORG

IPC: C07C201/08 ,  C07B61/00 ,  C07C201/06 ,  C07C205/06 ,  C07C

Abstract: Continuous, isothermal production of mononitrotoluene by reaction of toluene with HNO3, H2SO4 and H3PO4 is such that the latter two acids are introduced as a mixture of H2SO4 (45-80 wt.%), H3PO4 (9-45 wt.%) and water (5-15 wt.%), i.e. as a single component.

公开(公告)号：DE10117207C1

公开(公告)日：2002-11-14

申请号：DE10117207

申请日：2001-04-06

Applicant: BAYER AG

Inventor： GOTTA MATTHIAS ,  DEMUTH RALF ,  ZIRNGIEBL EBERHARD ,  WEBER HANS-MARTIN ,  RONGE GEORG

IPC: C07C201/08 ,  C07B61/00 ,  C07C201/06 ,  C07C205/06

Abstract: Continuous, isothermal production of mononitrotoluene by reaction of toluene with HNO3, H2SO4 and H3PO4 is such that the latter two acids are introduced as a mixture of H2SO4 (45-80 wt.%), H3PO4 (9-45 wt.%) and water (5-15 wt.%), i.e. as a single component.