公开(公告)号：DE4021582A1

公开(公告)日：1992-01-09

申请号：DE4021582

申请日：1990-07-06

Applicant: HOECHST AG

Inventor： STUEVEN UWE ,  SCHMIDT ADOLF DR ,  STROHMEYER ECKHARD ,  HIMMLER KLAUS

IPC: C09K5/00 ,  C09K5/04 ,  F25B15/00 ,  F25B15/02 ,  F25B30/04

公开(公告)号：DE3543171A1

公开(公告)日：1987-06-11

申请号：DE3543171

申请日：1985-12-06

Applicant: HOECHST AG

Inventor： STUEVEN UWE ,  SCHMIDT ADOLF DR

IPC: C09K5/04 ,  F24D11/02 ,  F24J3/00

Abstract: The pair of substances for absorption heat transformers consists of methanol and tetraethylene glycol dimethyl ether.

公开(公告)号：DE4413616A1

公开(公告)日：1995-10-26

申请号：DE4413616

申请日：1994-04-19

Applicant: HOECHST AG

Inventor： SCHMIDT ADOLF DR ,  MILLAUER HANS DR

IPC: C07C15/24 ,  C25B3/10

Abstract: The prodn. of 2,2'-dimethyl-1,1'-binaphthyl (I) and 2,7'-dimethyl-1,1'-binaphthyl (II) comprises the electrochemical oxidative dimerisation of 2-methylnaphthalene (III) in acetonitrile/water/conductive salt mixts. contg. other component(s) (IV) which is/are immiscible or only partly miscible with water, followed by fractionation under vacuum.Also claimed is 2,7'-dimethyl-1,1'-binaphthyl (II). Water-immiscible component (IV) comprises (cyclo)aliphatic, aromatic or halogenated hydrocarbon, ketone or a mixt. thereof, esp. e.g., pentane, hexane, cyclohexane, methylcyclohexane, heptane, octane, iso-octane, decane, dodecane or decalin, pref. 6-10C (cyclo)aliphatic hydrocarbon, esp. pref. heptane or octane, or benzene, toluene, xylene(s), mesitylene, naphthalene or tetralin, pref. 6-10C aromatic hydrocarbon, esp. pref. toluene or xylene, or CH2Cl2 or chlorobenzene, or a 5-10C ketone, pref. Et-CO-Et-, Me-CO-tert.-Bu or acetophenone. Or (III) itself may be used as component (IV), in amts. such that the electrolyte always contains 10-50 (pref. 15-40) wt.% (III). Suitable conductive salts are alkali, alkaline earth, ammonium or mono-, di-, tri- or tetra-alkylammonium salts of acids with anions derived from S(IV), P(V) or B(III), pref., e.g., hydrogen sulphate, methylsulphate, octanesulphonate, toluenesulphonate, methanephosphonate, hexafluorophosphate or tetrafluoro-borate (21 anions listed). Pref., salts are salts of opt. poly- or per-fluorinated alkane-sulphonic or -phosphonic acids, e.g., trifluoromethanesulphonate, nonafluoro-butanesulphonate or phosphonate, etc. (7 anions listed), or Na or tetra-(1-4C alkyl)-ammonium salts of 1-8C alkane-sulphonic acids, 1-4C poly- or per-fluoroalkane-sulphonic acids, arylsulphonic acids (with aryl = Ph, naphthyl, or alkyl- or Cl-substd. Ph), tetrafluoroboric acid or hexafluoro-phosphoric acid. Wt. ratio acetonitrile:water = (100:1)-(1:1), pref. (20:1)-(2:1); the electrolyte contains 10-90 (pref. 20-80) wt.% (IV) and 0.5-15 (pref. 1-7) wt.% conductive salt. Electrolysis is carried out at 0-80 (pref. 20-50) deg C, with a current density of 10-250 (pref. 25-150, esp. pref. 40-100) mA/cm , using an anode of graphite, vitreous carbon, Pt or stainless steel, pref. graphite, and a cathode of graphite, vitreous carbon or metal, pref. graphite or vitreous carbon. Rectification is carried out at up to 400 (pref. up to 350) deg C and 5-100 (pref. 10-80, esp. pref. 10-60) hPa (column head pressure), with 30-90 (pref. 40-80, esp. pref. 50-70) sepn. stages and a reflux ratio of 3-60.

公开(公告)号：DE4327872A1

公开(公告)日：1994-03-03

申请号：DE4327872

申请日：1993-08-19

Applicant: HOECHST AG

Inventor： RITTNER SIEGBERT DR ,  RIEDEL ALFRED DR ,  SCHMIDT ADOLF DR ,  SCHMIERER ROLAND DR ,  SPISKE JUERGEN DR

IPC: C07C51/44 ,  C07C53/16

Abstract: Sepn. of monochloroacetic acid from chlorination mixts. also contg. unreacted acetic acid and the di- and tri-chloroacetic acids is by rectification in a column with an ordered carbon-contg. packing. ADVANTAGE - The process has the following advantages over melt crystallisation: (i) the mono:chloro acid is sepd. in high yields without the formation of a mono:chloro acid-contg. eutectic; (ii) there is no need for prior removal of unreacted acid; and (iii) the sepn. can be effected on a continuous basis. The rectification can be combined with the melt crystallisation process or with a catalytic dechlorination process in presence of H2 (both combinations claimed).

公开(公告)号：DE2342144A1

公开(公告)日：1975-03-27

申请号：DE2342144

申请日：1973-08-21

Applicant: HOECHST AG

Inventor： SCHMIDT ADOLF DR

IPC: C07C67/48 ,  C07C69/14 ,  C07C69/15

Abstract: The extractive distillation is carried out using an extracting agent of b.pt. >100 degrees C. consisting of a benzene or naphthalene hydrocarbon (deriv.), whereby in a first stage the mixt. of vinyl acetate, methanol, methyl acetate, and acetaldehyde, opt. contng. a little water, is sepd. into a top prod. consisting of methanol, methyl acetate, acetaldehyde and small amts. of extracting agent and vinyl acetate, and a bottom prod. consisting of extracting agent and vinyl acetate, and in a second stage the bottom prod. is sepd. by distillation into vinyl acetate as top prod. and extracting agent as bottom prod. Prefd. extracting agents are e.g. 1,2,4-trimethylbenzene, chlorobenzene, o-dichlorobenzene and nitrobenzene. The process is esp. useful for treating solns. resulting from polymsn. of vinyl acetate in methanol soln. and gives vinyl acetate of high purity with very low aldehyde (polymsn. inhibitor) content.