公开(公告)号：DE3436348A1

公开(公告)日：1986-04-10

申请号：DE3436348

申请日：1984-10-04

Applicant: HOECHST AG

Inventor： WOJTECH BERNHARD DR ,  STEPPICH WALTER DR ,  FREUDENBERGER DIETER DR ,  RIEDEL KNUT DR

IPC: C07C53/00 ,  C07C51/00 ,  C07C51/48 ,  C07C53/08 ,  C07C55/02 ,  C07C59/01 ,  C07C67/00 ,  C07C51/487 ,  C07C53/124 ,  C07C55/08 ,  C07C59/06 ,  C07C59/08

Abstract: The invention relates to a process for the extraction of carboxylic acids from aqueous solutions with a carboxylic acid content below 8% by weight. A mixture of an aliphatic amine with a total carbon number of at least 10 and a phenol or naphthol is used as extracting agent. The molar ratio of phenol:amine or alkylated phenol:amine or naphthol:amine is in the range from 0.1:1 to around 1.1:1.

公开(公告)号：DE3605751C2

公开(公告)日：1994-05-26

申请号：DE3605751

申请日：1986-02-22

Applicant: HOECHST AG

Inventor： STENZEL JUERGEN DR ,  WOJTECH BERNHARD DR

IPC: C01G37/08 ,  B01D3/40 ,  B01D11/04

公开(公告)号：DE3627653A1

公开(公告)日：1988-02-25

申请号：DE3627653

申请日：1986-08-14

Applicant: HOECHST AG

Inventor： GOESSEL HELMUT DR ,  KUCKERTZ HERBERT DR ,  RITTNER SIEGBERT DR ,  ROSENFELDER JOSEF DR ,  WOJTECH BERNHARD DR

IPC: B01D11/04 ,  C02F1/26 ,  C02F1/58 ,  C07C67/00 ,  C07C201/00 ,  C07C201/16 ,  C07C205/21 ,  C07C205/22 ,  C07C205/25 ,  C07C205/26 ,  C07C79/24 ,  C07C79/32

Abstract: The invention relates to a process for extracting nitrohydroxyaromatics from aqueous solutions. In this process, the extracting agent used is an amine salt which comprises an aliphatic amine having a total carbon number of 10 to 75 and a strong acid. The amine salt can be employed undiluted or diluted with an organic solvent.

公开(公告)号：DE3436349A1

公开(公告)日：1986-04-10

申请号：DE3436349

申请日：1984-10-04

Applicant: HOECHST AG

Inventor： WOJTECH BERNHARD DR ,  MAYER MANFRED DR ,  OTT KARL-ERICH

IPC: C07C27/00 ,  C07C37/72 ,  C07C39/02 ,  C07C67/00 ,  C07C37/86 ,  C07C39/04 ,  C07C39/07 ,  C07C39/08

公开(公告)号：DE3316930A1

公开(公告)日：1984-11-22

申请号：DE3316930

申请日：1983-05-09

Applicant: HOECHST AG

Inventor： LEUPOLD ERNST INGO DR ,  WOJTECH BERNHARD DR ,  SCHMIDT HANS-JOACHIM DR

IPC: C07C69/14 ,  C07C27/00 ,  C07C27/34 ,  C07C29/86 ,  C07C67/00 ,  C07C27/32 ,  C07C31/02

公开(公告)号：DE58909807D1

公开(公告)日：1997-08-28

申请号：DE58909807

申请日：1989-10-10

Applicant: HOECHST AG

Inventor： MIESS GEORG-EMERICH DR ,  SCHWARZ KARL-HEINZ ,  TETZLAFF HERIBERT DR ,  WOJTECH BERNHARD DR

IPC: C07D207/267 ,  C07D201/16 ,  C07D207/38

Abstract: The invention relates to a process for separating N-methyl-2-pyrrolidone (NMP) from aqueous solutions which are obtained in industry, inter alia, in the production of heat-resistance polymers such as polyamides and polyimides. According to the invention, the extractants used are phenols which are sparingly soluble in water, are aliphatically monosubstituted and/or polysubstituted in the nucleus and have 4 to 16 carbon atoms in the straight-chain or branched, saturated or unsaturated aliphatic radical and have a boiling point which is preferably at least 20 DEG -25 DEG C. above the boiling point of NMP. If necessary, an inert, viscosity-reducing diluent is added.

公开(公告)号：DE3767074D1

公开(公告)日：1991-02-07

申请号：DE3767074

申请日：1987-08-12

Applicant: HOECHST AG

Inventor： GOESSEL HELMUT DR ,  KUCKERTZ HERBERT DR ,  RITTNER SIEGBERT DR ,  ROSENFELDER JOSEF DR ,  WOJTECH BERNHARD DR

IPC: B01D11/04 ,  C02F1/26 ,  C02F1/58 ,  C07C67/00 ,  C07C201/00 ,  C07C201/16 ,  C07C205/21 ,  C07C205/22 ,  C07C205/25 ,  C07C205/26

Abstract: The invention relates to a process for extracting nitrohydroxyaromatics from aqueous solutions. In this process, the extracting agent used is an amine salt which comprises an aliphatic amine having a total carbon number of 10 to 75 and a strong acid. The amine salt can be employed undiluted or diluted with an organic solvent.

公开(公告)号：DE3860641D1

公开(公告)日：1990-10-25

申请号：DE3860641

申请日：1988-05-27

Applicant: HOECHST AG

Inventor： KOHLHAAS FOLKER DR ,  KRUEGER KARL ,  WOJTECH BERNHARD DR

IPC: C02F1/26

公开(公告)号：AT47833T

公开(公告)日：1989-11-15

申请号：AT85112029

申请日：1985-09-23

Applicant: HOECHST AG

Inventor： WOJTECH BERNHARD DR ,  STEPPICH WALTER DR ,  FREUDENBERGER DIETER DR ,  RIEDEL KNUT DR

IPC: C07C53/00 ,  C07C51/00 ,  C07C51/48 ,  C07C53/08 ,  C07C55/02 ,  C07C59/01 ,  C07C67/00

公开(公告)号：DE3574131D1

公开(公告)日：1989-12-14

申请号：DE3574131

申请日：1985-09-23

Applicant: HOECHST AG

Inventor： WOJTECH BERNHARD DR ,  STEPPICH WALTER DR ,  FREUDENBERGER DIETER DR ,  RIEDEL KNUT DR

IPC: C07C53/00 ,  C07C51/00 ,  C07C51/48 ,  C07C53/08 ,  C07C55/02 ,  C07C59/01 ,  C07C67/00

Abstract: The invention relates to a process for the extraction of carboxylic acids from aqueous solutions with a carboxylic acid content below 8% by weight. A mixture of an aliphatic amine with a total carbon number of at least 10 and a phenol or naphthol is used as extracting agent. The molar ratio of phenol:amine or alkylated phenol:amine or naphthol:amine is in the range from 0.1:1 to around 1.1:1.