中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

25 records (took 0.022 seconds)

    2.
    发明专利
    未知

    公开(公告)号：DE2134016A1

    公开(公告)日：1973-01-18

    申请号：DE2134016

    申请日：1971-07-08

    Applicant: BASF AG

    Inventor： SCHECKER HANS-GEORG DR ,  KOEHLER WALDEMAR DR ,  SANDER BRUNO DR

    IPC: C07D319/12 ,  C07D15/10

    Abstract: 1387048 1,4-Dioxane BADISCHE ANILIN- & SODA-FABRIK AG 7 July 1972 [8 July 1971] 31929/72 Heading C2C Anhydrous 1,4-dioxane is prepared by mixing a catalyst consisting of SiF 4 , BF 3 or an adduct formed from BF 3 and 1,4-dioxane, with liquid ethylene oxide at a temperature of from -50‹ C. to 0‹ C. and keeping the mixture at a temperature of from -25‹ C to + 10‹ C. for 1-10 hours. A small amount of 1,3-dioxolane may also be formed.

    5.
    发明专利
    未知

    公开(公告)号：DE1643238A1

    公开(公告)日：1972-02-24

    申请号：DE1643238

    申请日：1967-08-16

    Applicant: BASF AG

    Inventor： BERDING CHRISTOPH DR ,  GUENTHERT PAUL DR ,  KOEHLER WALDEMAR DR ,  SCHULZ GERHARD DR

    Abstract: Continuous production of alkali metal salts of nitrilotriacetic acid from an alkali metal cyanide, formaldehyde and ammonia by reaction of the components in at least two stages, the alkali metal cyanide being reacted with formaldehyde in stoichiometric or substantially stoichiometric ratio at temperatures of 50 DEG to 200 DEG and pressures of from atmospheric pressure to 50 atmospheres gauge in the presence of an excess of ammonia in the first stage and (while simultaneously removing ammonia) further amounts of alkali metal cyanide and formaldehyde being allowed to act at temperatures of 60 DEG to 110 DEG C in one or more subsequent stages, 5 to 35 mole percent of the total amount of alkali metal cyanide required being replaced by free hydrocyanic acid and/or hydroxyacetonitrile.

    8.
    发明专利
    未知

    公开(公告)号：DE3684372D1

    公开(公告)日：1992-04-23

    申请号：DE3684372

    申请日：1986-07-07

    Applicant: BASF AG

    Inventor： VON OEHSEN UBBO DR ,  STECHER KARLHEINZ DR ,  KOEHLER WALDEMAR DR ,  MUELLER BERTHOLD DR ,  BRUNNMUELLER FRITZ DR ,  SCHNEIDER ROLF DR

    IPC: B01J21/12 ,  B01J23/86 ,  C01C3/02

    Abstract: Thermolytic cracking of formamide (I) to HCN and H2O is carried out by introducing superheated (I) gas at 300-480 deg.C under reduced pressure of 1-350 mbar and with 0.1-10 vol.% air into a reactor with a nest of tubes and passing at 450-590 deg.C and an average dwell time of 0.01-0.25 s over highly sintered mouldings, consisting of 50-100 wt.% Al2O3 and 50-0 wt. % SiO2 or over Cr-Ni stainless steel mouldings, which are resistant to high temp. corrosion. (I) is introduced at 300-400 deg.C and 50-150 mbar with 1.0-3.0 vol.% air; and cracked at 500-540 deg.C witha dwell time of 0.01-0.15 s.. The mouldings consist of 85-95 wt.% Al2O3 and 15-5 wt.% SiO2; or of 18-21 wt.% Cr, 9-13 wt.% Ni, 0-3 wt.% and the rest Fe.

    9.
    发明专利
    未知

    公开(公告)号：DE3314788A1

    公开(公告)日：1984-10-25

    申请号：DE3314788

    申请日：1983-04-23

    Applicant: BASF AG

    Inventor： MERGER FRANZ DR ,  TOWAE FRIEDRICH DR ,  HELLBACH HANS ,  KOEHLER WALDEMAR DR ,  ISBARN GUNTHER DR

    IPC: C07C265/14 ,  C07C67/00 ,  C07C69/00 ,  C07C241/00 ,  C07C263/04 ,  C07C263/06 ,  C07C265/04 ,  C07C119/042 ,  C07C118/00

    Abstract: Hexamethylene diisocyanate and/or isomeric alkylene diisocyanates having 6 carbon atoms in the alkylene radical, preferably 2-methylpentamethylene 1,5-diisocyanate and/or 2-ethyltetramethylene 1,4-diisocyanate are prepared without the use of phosgene in a multiple-step process by means of (a) reacting hexamethylene 1,6-diamine and/or isomeric alkylene diamines having 6 carbon atoms in the alkylene radical with urea and alcohol in the presence of dialkyl carbonate and/or carbamic acid alkyl ester as well as, in some cases, catalysts to form hexamethylene 1,6-dialkylurethane and/or isomeric alkylene dialkylurethanes having 6 carbon atoms in the alkylene radical, (b) separation and return to reaction step (a) of alcohol, dialkyl carbonate, and/or carbamic acid alkyl ester from the reaction mixture (c) evaporation of the hexamethylene 1,6-dialkylurethane and/or isomeric alkylene dialkylurethanes having 6 carbon atoms in the alkylene radical, (d) cleavage of the vaporized diurethanes into hexamethylene diisocyanate and/or isomeric alkylene diisocyanate having 6 carbon atoms in the alkylene radical and alcohol, and (e) fractional condensation of the cleavage products.

Patent Agency Ranking