中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

72 records (took 0.019 seconds)

    22.
    发明专利
    未知

    公开(公告)号：NO149773C

    公开(公告)日：1984-06-20

    申请号：NO781842

    申请日：1978-05-26

    Applicant: BASF AG

    Inventor： STOCKBURGER DIETER ,  VOLKAMER KLAUS ,  BENDER DETLEF ,  SCHNEIDER KLAUS-JUERGEN ,  SCHWENTKER HARALD ,  WAGNER ULRICH ,  WEITZ HANS-MARTIN

    IPC: B01D3/40 ,  C07C1/00 ,  C07C7/08 ,  C07C9/00 ,  C07C11/00 ,  C07C11/167 ,  C07C67/00 ,  C07C11/16

    Abstract: A process for separating, by means of a selective solvent, a mixture of C4-hydrocarbons which contains some hydrocarbons which are more soluble in the selective solvent and some which are less soluble therein, in which process the hydrocarbon mixture is separated, in an extractive distillation zone, into a top product which contains the less soluble hydrocarbons and an extract which contains the more soluble hydrocarbons and the selective solvent, the extract, taken off as the bottom product, is subjected to a flash evaporation and the resulting vapor component of the extract is recycled to the extractive distillation zone while the liquid phase remaining after the flash evaporation is fed to a solvent recovery zone, in which the liquid phase obtained from the flash evaporation is separated into a product containing the hydrocarbons and, as the bottom product, the selective solvent which has been freed from the hydrocarbons, the resulting selective solvent is recycled to the extractive distillation zone and the product which is obtained from the solvent recovery zone and contains the hydrocarbons is partially or completely recycled to the extractive distillation zone, after increasing the pressure in a compression zone, in which process the extract taken off the extractive distillation zone is brought, prior to the flash evaporation to a higher pressure than the pressure in the extractive distillation zone and thereafter the extract which is under this higher pressure is heated, in a heat exchange zone, by indirect heat exchange with the selective solvent obtained as the bottom product from the solvent recovery zone, and the heated extract is subsequently let down, in the flash evaporation, to a pressure which is at least equal to the pressure in the extractive distillation zone and is higher than the pressure in the solvent recovery zone.

    PRODUCTION OF PURE CONJUGATED C4 AND C5 DIOLEFINS FROM HYDROCARBON MIXTURES
    24.
    发明专利
    PRODUCTION OF PURE CONJUGATED C4 AND C5 DIOLEFINS FROM HYDROCARBON MIXTURES 未知

    公开(公告)号：CA980807A

    公开(公告)日：1975-12-30

    申请号：CA157352

    申请日：1972-11-21

    Applicant: BASF AG

    Inventor： WEITZ HANS-MARTIN ,  FUERST ERNST

    IPC: C07C1/00 ,  C07C7/00 ,  C07C7/08 ,  C07C7/10 ,  C07C7/11 ,  C07C11/12 ,  C07C13/02 ,  C07C67/00

    Abstract: 1401875 Extracting C 4 or C 5 conjugated diolefins BADISCHE ANILIN-& SODAFABRIK AG 24 Nov 1972 [26 Nov 1971] 54360/72 Heading C5E Pure C 4 or C 5 conjugated diolefins are separated from hydrocarbon mixtures by countercurrent gas scrubbing liquid-liquid extraction, extractive distillation and/or countercurrent distribution using as selective solvent a mixture of:- (a) 5-95 wt. per cent of an N-alkylpyrrolidone which may contain an inert substituent; and (b) 5-95 wt. per cent of an N-hydroxyalkyl compound of the general formula in which Y is C 2 or C 3 alkylene or alkenylene, or o-phenylene which may be wholly or partly hydrogenated R is a linear or branched alkylene and Z is oxygen or two hydrogens. The solvent mixture may contain up to 25 wt. per cent water. Preferred solvent components are (a) N-methylpyrrolidone; (b) N-hydroxyethylphthalimide, N-hydroxyethylsuccinimide and N-hydroxyethylpyrrolidone. The diolefins which may be separated by the process of the invention are butadiene, isoprene, 1,3-pentadiene and cyclopentadiene.

    PREVENTION OF FOULING IN HYDROCARBON SEPARATION
    25.
    发明专利
    PREVENTION OF FOULING IN HYDROCARBON SEPARATION 未知

    公开(公告)号：CA963414A

    公开(公告)日：1975-02-25

    申请号：CA138259

    申请日：1972-03-27

    Applicant: BASF AG

    Inventor： RAFF PAUL ,  RITZERT GERHARD ,  WEITZ HANS-MARTIN

    IPC: C07C7/20 ,  C23F14/02

    Abstract: 1375506 Separating hydrocarbons in the presence of an anti-fouling agent BADISCHE ANILIN- & SODA-FABRIK AG 29 March 1972 [1 April 1971] 14701/72 Heading C5E In the separation of hydrocarbon mixtures containing unsaturated hydrocarbons using a selective solvent at elevated temperature fouling is inhibited by a N-substituted N nitrosohydroxylamine RN(NO)OH in which R is an aliphatic, cycloaliphatic, or araliphatic hydrocarbon radical or an inertly substituted derivative thereof, and/or a salt thereof. The salt may be with an ammonium, organo-ammonium, metal or complex metal ligand cation, numerous metals being specified. The separation process may be the recovery of (i) acetylene from combustion mixtures; (ii) butadiene from C 4 hydrocarbon mixtures; (iii) isoprene and/or cyclopentadiene from C 5 mixtures; (iv) butenes from C 4 mixtures; or (v) aromatics from mixtures, in each case using a selective solvent, and preferably at above 50‹ C. The solvent may be dimethylformamide, dimethylacetamide, furfurol, acetonitrile or N-methylpyrrolidone, preferably containing 5-15% by wt. of water. The anti-fouling agent is used in an amount from 1 p.p.m. to 10% by wt. relative to the solvent, optionally in conjunction with a known inhibitor, e.g. t-butylpyrocatechol, hydroquinone, a mercaptan, phenothiazine, #- naphthylamine, a phosphorous acid ester, methylene blue, an aldehyde, or sodium nitrite. The solvent may also include a pH buffer. In examples, Ce, Ca, K, NH 4 and Al salts of N-nitroso-N-cyclohexylhydroxylamine, and the Na salts of the n-octyl, cyclododecyl, and cyclooctyl derivatives are used.

    Separation of Methacrylic Acid and Acrylic Acid
    26.
    发明专利
    Separation of Methacrylic Acid and Acrylic Acid 未知

    公开(公告)号：GB1167793A

    公开(公告)日：1969-10-22

    申请号：GB768867

    申请日：1967-02-17

    Applicant: BASF AG

    Inventor： NONNENMACHER HELMUT ,  WEITZ HANS-MARTIN ,  WILLERSIN CARL-HEINZ

    IPC: C07C51/48 ,  C07C57/07

    Abstract: 1,167,793. Acrylic, methacrylic acids. BADISCHE ANILIN- & SODA-FABRIK A.G. 17 Feb., 1967 [19 Feb., 1966], No. 7688/67. Heading C2C. Acrylic and/or methacrylic acid is/are separated from mixtures containing them by extraction with a 4- to 7-membered lactam with a hydrocarbon (6-20 C) radical as a substituent on the nitrogen atom. Propiolactams, pyrrolidones, piperidones and caprolactam with an alkyl, alkenyl, cycloalkyl, aryl or aralkyl radicals as substituents are used, e.g. N-isooctylpyrrolidone, N-dodecylpyrrolidone, and N- oleylpyrrolidone. The extraction may be bathwise or continuously in one or more stages, and may be liquid-liquid extraction or extraction from the gas phase.

    Separating acrylonitrile or methacrylonitrile from mixtures containing the same
    29.
    发明专利
    Separating acrylonitrile or methacrylonitrile from mixtures containing the same 未知

    公开(公告)号：GB1087524A

    公开(公告)日：1967-10-18

    申请号：GB505165

    申请日：1965-02-05

    Applicant: BASF AG

    Inventor： WEITZ HANS-MARTIN ,  FRIZ HANS ,  PLATZ ROLF

    IPC: C07C20060101

    Abstract: Acrylonitrile and methacrylonitrile are separated from mixtures, obtained by the ammonia oxidation of propylene or isobutylene, by extractive countercurrent methods wherein the extractive solvent is a 5- or 6-ring membered lactam, N-substituted lactam or lactone, an acyclic or cyclic sulphone or sulphoxide, an N-alkylcarboxylic amide, an N,N-dialkylcarboxylic acmide or propylene carbonate. The two phase flowing in counter current comprise the reaction mixture and the solvent and may be liquid/liquid phases or gas/liquid phases respectively. The process is illustrated by reference to flow drawings (not shown) representing a gas/liquid extraction and extractive distillation. A liquid/liquid extraction using an auxiliary solvent is also described. Examples relate to the use of N-methylpyrrolidone, propylene carbonate, 3 - methyltetramethylene sulphone, butyrolactone, dimethyl sulphoxide, N - q -hydroxyethyl pyrrolidone, and dimethyl-formamide as extractive solvents.

Patent Agency Ranking