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    PREPARATION OF TETRAHYDROFURAN
    61.
    发明专利
    PREPARATION OF TETRAHYDROFURAN 未知

    公开(公告)号：CA1117960A

    公开(公告)日：1982-02-09

    申请号：CA342076

    申请日：1979-12-17

    Applicant: BASF AG

    Inventor： HARTIG JUERGEN ,  WEITZ HANS-MARTIN

    IPC: B01J21/00 ,  C07B61/00 ,  C07D307/08

    Abstract: O.Z. 0050/033,590 PREPARATION OF TETRAHYDROFURAN A process for the preparation of tetrahydrofuran by heating a carboxylic acid diester of butane-1,4-diol in the gas phase at above about 160.degree.C in the presence of an aluminum oxide catalyst which is obtained by drying, at 70 - l20.degree.C, an aluminum hydroxide gel which has been precipitated from an aqueous aluminum sulfate solution by means of a basic agent.

    PROCESS FOR WORKING UP NITRATION MIXTURES
    63.
    发明专利
    PROCESS FOR WORKING UP NITRATION MIXTURES 未知

    公开(公告)号：CA1053703A

    公开(公告)日：1979-05-01

    申请号：CA196696

    申请日：1974-04-03

    Applicant: BASF AG

    Inventor： WEITZ HANS-MARTIN ,  FISCHER ROLF

    IPC: C07C205/45 ,  C07C67/00 ,  C07C201/00 ,  C07C201/16 ,  C07C79/36

    Abstract: The present invention relates to a process for working up a reaction mixture obtained by nitration of cyclohexanone in the presence or absence of cyclohexanol with at least 95% w/w nitric acid at a temperature of not more than 90.degree.C in the presence of halogenated aliphatic hydrocarbons as inert solvents in a ratio by weight of halohydrocarbon to cyclohexanone from 100:1 to 1:10, wherein nitric acid from 40 to 80% by weight is added to the reaction mixture in such an amount that the resulting concentration of nitric acid in the reaction mixture is from 60 to 80% by weight, at a temperature between 0 and 30.degree.C and the nitric acid phase is separated from the organic phase, the latter being separated by distillation into 2-nitrocyclo-hexanone and unconverted cyclohexanone.

    Production of 1,4-dicyanobutene-(2)
    64.
    发明专利
    Production of 1,4-dicyanobutene-(2) 未知

    公开(公告)号：GB1140131A

    公开(公告)日：1969-01-15

    申请号：GB2206366

    申请日：1966-05-18

    Applicant: BASF AG

    Inventor： WEITZ HANS-MARTIN ,  MERGER FRANZ ,  KOOPMAN JUERGEN

    IPC: B01J19/00 ,  C01B7/09 ,  C25B1/24

    Abstract: 1,140,131. 1,4 - Dicyanobutene - (2). BADISCHE ANILIN- & SODA-FABRIK A.G. 18 May, 1966 [19 May, 1965], No. 22063/66. Heading C2C. [Also in Division C1] 1,4 - Dicyanobutene - (2) is obtained by reacting at an elevated temperature 1,2- dibromobutene-(3) and/or 1,4-dibromobutene- (2) with at least the stoichiometric amount of HCN in the presence of a copper salt in an aqueous acid medium at a pH of - 1 to + 3 using a buffer substance which exhibits buffering action in the said pH range as an acid acceptor, the acid acceptor being present in an amount of at least 1 equivalent per mole of dibromobutene, separating the resultant 1,4-dicyanobutene-(2) from the reaction mixture, oxidizing the HBr present in the aqueous solution to elementary Br 2 , separating Br 2 and returning the aqueous solution containing the acid acceptor to the reaction. The reaction may be carried out continuously or batchwise. The acid acceptors specified are alkali metal salts or alkaline earth salts of medium strength acids. The reaction solution may contain catalysts for the reoxidation of the bromine anions. Examples are given for the production of 1,4- dicyanobutene-(2) and an apparatus is described which is suitable for carrying out the continuous process.

    Separating and recovering cyclopentadiene
    65.
    发明专利
    Separating and recovering cyclopentadiene 未知

    公开(公告)号：GB1094992A

    公开(公告)日：1967-12-13

    申请号：GB939765

    申请日：1965-03-05

    Applicant: BASF AG

    Inventor： WEITZ HANS-MARTIN ,  KROEPER HUGO ,  WAGNER ULRICH ,  RITZ JOSEF

    IPC: C07C7/00 ,  C07C7/08 ,  C07C7/11

    Abstract: Cyclopentadiene is recovered from C5 hydrocarbon containing diolefins, prior to the separation of isoprene, by counter-current contact with sufficient selective solvent to dissolve substantially only the cyclopentadiene, the solvent being a heterocyclic compound having a nitrogen or oxygen heteroatom adjacent to a single carbonyl group, contacting the resultant solution with an inert liquid or gas to remove dissolved diolefins other than cyclopentadiene and expelling cyclopentadiene from the remaining solution; recovered solvent may be recycled preferably after removing cyclopentadiene dimer from a bleed stream. The solvent may be a lactam, lactone, N-alkyllactam, N-hydroxyalkyllactam, N-acylpyrrolidine or N-acylpiperidine, and may contain up to 40% of water; preferably the same solvent is used in the subsequent isoprene recovery. In a preferred embodiment the mixture as a gas enters tower 1 by line 4 and the solvent by line 5. The solution is passed to tower 2 where it is contacted with an inert gas, e.g. cyclopentadiene, hydrocarbons less soluble than diolefins, nitrogen or steam; in an example C5 gas from the process after removal of isoprene enters by line 8 and steam by line 9. In the absence of steam, heat may also be applied. The gases obtained are returned to tower 1 by line 4. From the bottom solution then enters tower 3 where it is heated to expel cyclopentadiene recovered as a side stream 10. Overhead gases may be returned to tower 2 as all or part of the stripping gas. The gas-liquid absorption step may be replaced by liquid-liquid absorption using a counter-solvent (hydrocarbons) or anti-solvent (water) introduced near the point of removal of solution, or by an extractive distillation.

    Process for the separation of conjugated diolefines from allenes and acetylenes
    70.
    发明专利
    Process for the separation of conjugated diolefines from allenes and acetylenes 未知

    公开(公告)号：GB974879A

    公开(公告)日：1964-11-11

    申请号：GB4377562

    申请日：1962-11-20

    Applicant: BASF AG

    Inventor： KROEPER HUGO ,  WAGNER ULRICH ,  WEITZ HANS-MARTIN

    IPC: C07C7/11

    Abstract: Conjugated 1,3-dienes with 4 or 5 carbon atoms are separated from mixtures of the said diene and up to 5% by weight of C4-C5 alkynes and C4-C5 1,2-alkadienes, by passing the mixture at -10 DEG to + 150 DEG C. at 1-15 atmospheres absolute pressure counter-currently to a liquid stream of a selective solvent, said solvent being furfural, acetonitrile, saturated lactams or lactones with 4 or 5 carbon atoms in the ring, N-alkyl substituted lactams with 4 or 5 carbon atoms in the ring and 1-4 carbon atoms in the N-alkyl group, N-hydroxyalkyl lactams with 4 or 5 carbon atoms in the ring and 1-4 carbon atoms in the N-hydroxyalkyl group, or N-acylated cyclic amines with 4 or 5 carbon atoms and a nitrogen atom in the ring and 1-3 carbon atoms in the N-acyl group. The solvent may be used in pure form or in admixture with up to 25% by weight of water. The examples describe the separation of 1,3-butadiene from 1,2-butadiene and 1- and 2-butyne and isoprene from 3-methyl-1,2-butadiene and 1- and 2-pentyne.

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