公开(公告)号：DE2625075A1

公开(公告)日：1977-12-22

申请号：DE2625075

申请日：1976-06-04

Applicant: BASF AG

Inventor： HERBIG KLAUS DIPL CHEM DR ,  ROSKE ECKHARD ,  STOCKBURGER DIETER DR ,  BRUNOLD ANDREAS DIPL ING ,  DIETRICH HANS JUERGEN DIPL ING

IPC: C07C20060101 ,  C07C263/10 ,  C07C265/04 ,  C07C271/02 ,  C07C119/042 ,  C07C118/02 ,  C07C125/03

Abstract: Prepn. of carbamoyl chlorides and isocyanates comprises reacting a solid primary amine salt with COCl2 at high temp. The amine salt is pref. a hydrochloride. The reaction temp. is pref. 10-70 degrees C. below the m.pt. of the salt (generally 145-250 degrees C.). The particle size of the salt is pref. 1-500 (esp. 2-50) mu. The reactor can be a rotating tube, a reactor equipped with stirrer paddles, or an fluidised bed reactor in which the support material is pref. Al2O3. The carbamoyl chloride produced can be sepd. from the gaseous reaction products by quenching in an inert solvent; the resulting solnl. can then by distd. to form and isolate the isocyanate. The products are useful as intermediates for biologically active cpds., plant protection agents, polyurethanes, etc. The process is esp. useful for preparing aliphatic diisocyanates, which can be converted to light-stable polyurethanes. The process gives high yields (e.g. 50-98%) and is suitable for use on an industrial scale.

公开(公告)号：DE2415169A1

公开(公告)日：1975-10-16

申请号：DE2415169

申请日：1974-03-29

Applicant: BASF AG

Inventor： HERRMANN EBERHARD ,  PESCHAU GERHARD DIPL ING ,  KIEL WALTER ,  STOCKBURGER DIETER DR ,  BRUNOLD ANDREAS DIPL ING ,  HECK WOLFGANG DIPL CHEM DR ,  OPP KARL DIPL CHEM DR

IPC: B01D7/02 ,  C01F7/58 ,  B01D7/00 ,  B01D5/00 ,  B01D53/00

Abstract: Vapours and gases containing compds. which sublime from a reactor are fed into a desublimation zone which consists of a cooled cylindrical shell in which a bed of desublimed particles are held in turbulent motion by agitator with blades. If the angular velocity of the rotor is W and the i. radius of the shell R, the Froude number is defined as Rw2/g where g is the acceleration due to gravity. Fr. should be above 1, pref. 5-10. The gas flowsin at one side of the shell and out with the particles at the other. The agitator is heated. There is an annular space for collecting product at the end of the shell. There should be a clearance of 0.5-12mm between the edge of the blades and the shell.

公开(公告)号：DE2135086A1

公开(公告)日：1973-02-01

申请号：DE2135086

申请日：1971-07-14

Applicant: BASF AG

Inventor： OPP KARL DR ,  BRUNOLD ANDREAS DIPL ING ,  HALLER RUDOLF DR ,  WEISS GUENTHER DR ,  WYGASCH EWALD DR

IPC: B01D53/64 ,  C01B3/52 ,  C01G13/04 ,  B01D53/14