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    PROCESS FOR THE CONTINUOUS PREPARATION OF ACETIC-ACID ESTERS
    41.
    发明专利
    PROCESS FOR THE CONTINUOUS PREPARATION OF ACETIC-ACID ESTERS 未知

    公开(公告)号：DE3160350D1

    公开(公告)日：1983-07-07

    申请号：DE3160350

    申请日：1981-05-06

    Applicant: BASF AG

    Inventor： BOTT KASPAR DR ,  KAIBEL GERD ,  HOFFMANN HERWIG DR ,  IRNICH RUDOLF DR ,  SCHAEFER EBERHARD

    IPC: C07C67/03 ,  B01D3/36 ,  C07C67/02 ,  C07C69/14

    Abstract: A process for the preparation of acetic acid esters CH3-CO-O-R1 (I, R1=an organic radical other than methyl and ethyl) by alkali-catalyzed trans-esterification of an acetic acid ester CH3-CO-O-R2 (II, R2=methyl or ethyl) with an alcohol R1-OH (III), accompanied by elimination of the alcohol R2-OH (IV), wherein (a) the trans-esterification reaction is carried out in the middle section KM of a distillation column K, the alcohol III being fed as liquid into the upper zone and the ester II into the lower zone of KM, (b) the alkaline catalyst is introduced into the upper part KU of K, (c) the alcohol IV, or a mixture of IV and the ester II, is taken off the top of the column, (d) the mixture obtained from (c) (unless the alcohol IV alone is obtained) is separated in the column section KU or in a stripper column KS into IV and the azeotrope of II and IV, and the latter is recycled to the lower zone of KM, (e) the ester I is taken as vapor or liquid from the lower zone of the lower section KL of K and (f) the catalyst is either removed, or recycled to KU, in a conventional manner.

    Pure chloroformate prepn - from phosgene and alcohols reacted in presence of active carbon
    46.
    发明专利
    Pure chloroformate prepn - from phosgene and alcohols reacted in presence of active carbon 未知

    公开(公告)号：DE2161254A1

    公开(公告)日：1973-06-20

    申请号：DE2161254

    申请日：1971-12-10

    Applicant: BASF AG

    Inventor： HOFFMANN HERWIG DR ,  WENNER GOTTHILF DR ,  DATOW JOACHIM DR

    IPC: C07C68/02 ,  C07C69/96 ,  C07C69/62

    Abstract: Pure chloroformates having the general formula R-(OOCCl)n, (I), (where R is an aliphatic or cycloaliphatic gp. and n is 1 or 2) are prepd. by reaction of COCl2 with alcohols R(OH)n (II) effected in the presence of active C, used esp. in 0.05-3 (0.02-2) wt.% concn. w.r.t. (II). (I) are starting materials for prodn. of pesticides, plastics, dyes, synthetics. They should be highly pure for prodn. of peroxide polymsn. catalysts, e.g. of diisopropyl peroxy dicarbonate from isopropyl chloroformate; of transparent polycarbonates, e.g. derived from diglycol-bis-chloroformates with allyl alcohol; of therapeutic cpds., e.g. derived from Et chloroformate.

    1,4-of 1,5-dichlorohydrocarbons - continuous prepn using simple appts
    47.
    发明专利
    1,4-of 1,5-dichlorohydrocarbons - continuous prepn using simple appts 未知

    公开(公告)号：DE2149822A1

    公开(公告)日：1973-06-14

    申请号：DE2149822

    申请日：1971-10-06

    Applicant: BASF AG

    Inventor： SCHOENLEBEN WILLIBALD DR ,  DATOW JOACHIM DR ,  HOFFMANN HERWIG DR ,  WINDERL SIEGFRIED DR

    IPC: C07C17/093 ,  C07C17/16

    Abstract: Continuous prepn. of 1,4- or 1,5-dichlorinated hydrocarbons by reaction of a liq. mixt. of 1,4- or 1,5-diols and/or corresp. cyclic ethers and HCl, opt. in the presence of a catalyst. The vapour of the boiling reaction mixt. is fractionated in such a way that a liq. mixt. of the dichloro cpd. and H2O is obtd. on one hand and a gaseous mixt. of HCl, cyclic ether and possibly remaining dichloro cpd. on the other; after condensing the gaseous mixt. is led back to the reaction mixt. The process is esp. used for prepn, of 1,4-dichlorobutane and 1,5-dichloropentene. Only simple appts. is required and approx. normal press.

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