EP 0910585 A1 19990428 - PRODUCTION OF CELLULOSE CARBAMATE
Title (en)
PRODUCTION OF CELLULOSE CARBAMATE
Title (de)
CELLULOSECARBAMATHERSTELLUNG
Title (fr)
PRODUCTION DE CARBAMATE DE CELLULOSE
Publication
Application
Priority
- DE 19628277 A 19960712
- EP 9703593 W 19970708
Abstract (en)
[origin: DE19628277A1] A method of producing cellulose carbamate is described in which: (a) cellulose is brought into contact with liquid ammonia at an initial pressure exceeding atmospheric pressure and a temperature of at least about 25 DEG C, in the presence of urea, the quantity of liquid ammonia sufficing at least to wet the surface of the cellulose; (b)the volume available to the cellulose-urea-liquid ammonia system is enlarged explosively, lowering the pressure by at least 5 bar, and an activated mixture of cellulose and urea is obtained; (c) the activated mixture of cellulose and urea is taken up in an inert organic carrier for the reaction, and heated to a temperature between about 110 DEG C and 150 DEG C to make cellulose carbamate, and (d) the organic reaction carrier and any urea not reacted are removed from the cellulose carbamate obtained. The method saves energy and supplies a very homogenous cellulose carbamate.
IPC 1-7
IPC 8 full level
C08B 1/00 (2006.01); C08B 15/06 (2006.01)
CPC (source: EP)
C08B 1/00 (2013.01); C08B 15/06 (2013.01)
Citation (search report)
See references of WO 9802464A1
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB GR IE IT LI NL PT SE
DOCDB simple family (publication)
DE 19628277 A1 19980115; DE 19628277 C2 19980709; AU 3443497 A 19980209; BR 9710297 A 19990817; CA 2260782 A1 19980122; CZ 4199 A3 19990512; EP 0910585 A1 19990428; JP 2000505135 A 20000425; PL 331046 A1 19990621; TR 199900025 T2 19990421; WO 9802464 A1 19980122
DOCDB simple family (application)
DE 19628277 A 19960712; AU 3443497 A 19970708; BR 9710297 A 19970708; CA 2260782 A 19970708; CZ 4199 A 19970708; EP 9703593 W 19970708; EP 97930510 A 19970708; JP 50557798 A 19970708; PL 33104697 A 19970708; TR 9900025 T 19970708