中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

34 records (took 0.022 seconds)

    Recovery of epsilon-caprolactone and alkane dicarboxylic acid by acid treatment and vacuum distillation
    1.
    发明授权
    Recovery of epsilon-caprolactone and alkane dicarboxylic acid by acid treatment and vacuum distillation 失效
    通过酸处理和真空蒸馏回收EPSILON-CAPROLACTONE和ALKANE DICARBOXY ACID

    公开(公告)号：US3597330A

    公开(公告)日：1971-08-03

    申请号：US3597330D

    申请日：1968-04-24

    Applicant: BASF AG

    Inventor： WEGERICH ANTON ,  GROSSKINSKY OTTO-ALFRED ,  WINDERL SIEGFRIED ,  BLUM GERHARD

    IPC: C07C51/44 ,  C07C51/50 ,  C07D201/16 ,  B01D3/34

    CPC classification number: C07D201/16 ,  C07C51/44 ,  C07C51/50 ,  C07C55/14 ,  C07C55/12 ,  C07C55/10

    Abstract: THE RECOVERY OF EPSILON CAPROLACTONE AND OF ALKANE DICARBOXYLIC ACIDS FROM MIXTURES SUCH AS ARE OBTAINED IN THE INDIVIDUAL WASHING STEPS OF THE PROCESS FOR OXIDATION OF CYCLOHEXANE WITH AIR AT ELEVATED TEMPERATURE AND AT SUPERATMOSPHERIC PRESSURE AND CONTAINING SUBSTANTIALLY MONOCARBOXYLIC ACIDS, DICARBOXYLIC ACIDS AND EPSILON-HYDROXYCAPROIC ACID (IF DESIRED AFTER PART OF THE ADIPIC ACID PRESENT HAS BEEN SEPARATED) BY REMOVING WATER (IF PRESENT) AND THE MAJOR PORTION OF THE MONOCARBOXYLIC ACIDS (IF PRESENT) BY DISTILLATION, ADDING 1 TO 30% BY WEIGHT OF PHOSPHORIC ACID OR A COMPOUND FORMING THE SAME OR BORIC ACID, HEATING THE MIXTURE OBTAINED UNDER SUBATMOSPHERIC COMPONENTS, CONDENSING THE INDIVIDUAL FRACTIONS AND RECTIFYING AND/OR CRYSTALLIZING THE FRACTIONS. DISTILLATION TEMPERATURES ABOVE 150*C. ARE AVOIDED. EPSILON CAPROLACTONE IS USEFUL FOR THE PRODUCTION OF CAPROLACTAM, A STARTING MATERIAL FOR THE PRODUCTION OF FIBERS.

    4.
    发明专利
    未知

    公开(公告)号：DE3680812D1

    公开(公告)日：1991-09-19

    申请号：DE3680812

    申请日：1986-04-22

    Applicant: BASF AG

    Inventor： GROSSKINSKY OTTO-ALFRED ,  HERRMANN GUENTER ,  LOEFFLER ULRICH ,  SCHNABEL ROLF ,  STUETZER DIETER

    IPC: C07C27/12 ,  B01F1/00 ,  B01F3/04 ,  C01B13/00 ,  C07C27/00 ,  C07C35/08 ,  C07C45/00 ,  C07C49/403 ,  C07C67/00

    Abstract: Solns. (I) of mol. O2 (II) in liq. hydrocarbons (III) are produced by contacting (III) with (II) under elevated pressure in a vertical absorption zone. The novel features are as follows: (a) there is a water layer (IV) at the lower end of the absorption zone; (b) (II) is passed into (IV); (c) (III) is supplied above (IV); (d) the finely-divided (II) rising from (IV) and (III) are passed upwards at 0-50 deg.C, with thorough mixing in the absorption zone, so that no coherent gas phase develops; and (e) (I) is discharged at the top of the absorption zone. (I) is recirculated in an amt. of 2-50 times the amt. of (III) supplied. The mixt. of (III) and (II) is passed through narrow points in the absorption zone. Absorption is carried out at 10-100 bar, depending on the amt. of (IV). A small amt. of liquid is removed at the top of the absorption zone. (IV) contains salts and surfactants.

Patent Agency Ranking