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公开(公告)号：AT70739T
公开(公告)日：1992-01-15
申请号：AT90100128
申请日：1990-01-04
Applicant: HOECHST AG
Inventor： ERPENBACH HEINZ DR , GOEDICKE EITEL DR , LORK WINFRIED , TETZLAFF HERIBERT DR
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公开(公告)号：DE19533889A1
公开(公告)日：1997-03-20
申请号：DE19533889
申请日：1995-09-13
Applicant: HOECHST AG
Inventor： SEMEL JOACHIM DR , TETZLAFF HERIBERT DR
Abstract: A new process for the removal of organic halogenated cpds. (OHC) from an aq. phase involves (a) known liquid/liquid extraction of the aq. phase with a non-aq. extraction medium and (b) subjecting the OHC in the extractant to a Wurtz-Fittig reaction. A multistage countercurrent extraction is employed using a non-polar solvent unreactive to Na, pref. aromatic or aliphatic solvents or ethers, esp. toluene, paraffins or di-n-butyl ether. The Wurtz-Fittig reaction is carried out between the m.pt. of Na and the b.pt. of the solvent.
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公开(公告)号：DE4026628A1
公开(公告)日：1992-02-27
申请号：DE4026628
申请日：1990-08-23
Applicant: HOECHST AG
Inventor： MILDENBERGER HILMAR DR , KNORR HARALD DR , SCHULZ ECKHARD DR , TETZLAFF HERIBERT DR
IPC: C07C227/40 , C07C229/24 , C07F9/30 , C07F9/50
Abstract: A large number of customary processes for separating amino acids fails when very polar hydrophilic amino acids with isoelectric points (IEP) which are close to one another are to be fractionated. Mixtures of L-glutamic acid (IEP=3.24) and L-phosphinothricin (IEP=2.6) produced by enzymatic transaminations of the corresponding alpha -keto acid have been difficult to separate to date. The invention relates to a process for separating L-phosphinothricin and L-glutamic acid, which comprises carrying out the separation as liquid/liquid extraction with two non-miscible aqueous phases as phase system, where the phase former contained in the phase system is a combination of at least two different water-soluble polymers or of at least one water-soluble salt and one water-soluble polymer, and the extraction is carried out by multistage countercurrent partition on the van Dijck principle.
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公开(公告)号：DE4020855A1
公开(公告)日：1992-01-02
申请号：DE4020855
申请日：1990-06-29
Applicant: HOECHST AG
Inventor： RITTNER SIEGBERT DR , RIEDEL ALFRED DR , HAUTZEL VOLKER DR , GSCHEIDMEIER MANFRED DR , MAGINOT JOACHIM DIPL ING , TETZLAFF HERIBERT DR
IPC: C07C45/81
Abstract: Impurities are sepd. from technical grade (at least 50%) camphor (I) by melting the (I), and then cooling to allow pure (I) to crystallise out. The crystallisation process which initially sets in and continues practically to a standstill, is set in motion against at least once by a heating step. Pref., 1-4 heating steps are employed. USE/ADVANTAGE - This method gives pure (I) without the need for solvent recrystallisation (and consequently drying), so avoids loss of both product and solvent. Pure (I) is used as a plasticiser for cellulose nitrate (in prepn. of celluloid and nitrocellulose lacquer) or cellulose propionate. It is also useful as a pharmaceutical (antiseptic or cardiac stimulant);perfume component; clothes moth repellent; in smokeless gunpowder or primers, and as fumigant. (4pp Dwg.No.0/0)
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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
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.
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Patent Agency Ranking
公开(公告)号：DE59000022D1
公开(公告)日：1992-02-06
申请号：DE59000022
申请日：1990-01-04
Applicant: HOECHST AG
Inventor： ERPENBACH HEINZ DR , GOEDICKE EITEL DR , LORK WINFRIED , TETZLAFF HERIBERT DR
IPC: B01J38/00 , B01J31/40 , B01J38/04 , C07B61/00 , C07C27/00 , C07C27/26 , C07C51/12 , C07C51/373 , C07C51/42 , C07C51/54 , C07C51/56 , C07C51/573 , C07C53/08 , C07C53/12 , C07C67/37 , C07C69/16
Abstract: In a process for the purification and recovery of a contaminated catalyst solution produced during carbonylation of methanol and/or methyl acetate and/or dimethyl ether and containing carbonyl complexes of rhodium, organic and/or inorganic promoters, undistillable organic impurities and acetic acid, acetic anhydride and ethylidene diacetate, the organic impurities and acetic acid, acetic anhydride and ethylidene diacetate are removed from the contaminatd catalyst solution by extraction at pressures from 35 to 450 bar and temperatures from 0 DEG to 120 DEG C. with a liquefied or supercritical gas, and the phase of the liquefied or supercritical gas is separated from the purified, promoter-containing catalyst solution, the phase of the liquefied or supercritical gas is separated by flash vaporization, the recovered gas is re-employed for extraction, acetic acid, acetic anhydride and ethylidene diacetate are separated off from the component which remains liquid, and are combined with the purified catalyst complex to prepare fresh catalyst solution and, finally, the organic impurities remaining as the residue on separation of the phase of the liquefied or supercritical gas is purged.
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公开(公告)号：AT155777T
公开(公告)日：1997-08-15
申请号：AT89118792
申请日：1989-10-10
Applicant: HOECHST AG
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.
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公开(公告)号：DE58902288D1
公开(公告)日：1992-10-22
申请号：DE58902288
申请日：1989-08-26
Applicant: HOECHST AG
Abstract: A process is disclosed for the separation of halogenated hydrocarbons from concentrated hydrochloric acid, which contains 10 to 37% by weight of hydrogen chloride. The hydrochloric acid is freed from the halogenated hydrocarbons in an extraction with paraffins having more than 7 carbon atoms, or with paraffin waxes having dropping points from 70 DEG to 160 DEG C. or with paraffin/paraffin wax mixtures, preferably in a continuous counterflow extraction or cross-flow extraction.
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公开(公告)号：DE4022247A1
公开(公告)日：1992-01-16
申请号：DE4022247
申请日：1990-07-12
Applicant: HOECHST AG
Inventor： TETZLAFF HERIBERT DR , MUELLER INGRID DR , RITTNER SIEGBERT DR , WINGEN RAINER DR
IPC: C07D239/36 , C07D239/38 , C09K19/34
Abstract: Disclosed is a method for the separation by multi-stage extraction of 2-alkylthio-5-phenylpyrimidines of general formula (I) in which R is H or an alkyl group with 1 to 15 C-atoms, X is an oxygen atom or a single bond and R is an alkyl with 1 to 15 C-atoms, using two organic solvents which give two immiscible phases. The method has the advantage that the phenylpyrimidines are obtained from the reaction mixture at a high level of purity even on a commercial scale.
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公开(公告)号：DE3904590A1
公开(公告)日：1990-08-23
申请号：DE3904590
申请日：1989-02-16
Applicant: HOECHST AG
IPC: C07C51/48
Abstract: Halocarboxylic acids, which are obtained in many reactions in the form of mixtures, can be separated by means of an extraction method. This separation by means of this extraction is carried out by countercurrent distribution of the mixture in a distribution medium (bed) composed of two solvents which are not miscible with each other. The acids in question are obtained with a high degree of purity.
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