Global Patent Index - EP 1082347 A1

EP 1082347 A1 2001-03-14 - METHOD FOR OBTAINING CELLULOSE CARBAMATE

Title (en)

METHOD FOR OBTAINING CELLULOSE CARBAMATE

Title (de)

VERFAHREN ZUR GEWINNUNG VON CELLULOSECARBAMAT

Title (fr)

PROCEDE DE PREPARATION DE CARBAMATE DE CELLULOSE

Publication

EP 1082347 A1 (DE)

Application

EP 99917875 A

Priority

  • DE 19814138 A
  • EP 9902073 W

Abstract (en)

[origin: DE19814138A1] The invention relates to a method for obtaining cellulose carbamate. According to this method, the cellulose carbamate is suspended in an inert liquid which also contains unreacted carbamide left over from the production of the cellulose carbamate. The cellulose carbamate is obtained by filtering this suspension in order to essentially remove the residual carbamide and inert liquid. The filtration process is preferably carried out in a vacuum and is advantageously followed by a drying process using a screw-conveyor drier or a rotary drum drier. The dried cellulose carbamate is advantageously washed with alcohol, especially methanol, in order to remove adherent residual carbamide, especially using a belt washer. This is again followed by a drying process, especially using a screw-conveyor drier or a rotary drum drier. The inventive method is both simple and economical and avoids the secondary products, especially biuret, which are produced in known methods and which then have to be removed at a cost.

IPC 1-7 (main, further and additional classification)

C08B 15/06

IPC 8 full level (invention and additional information)

C08B 15/06 (2006.01)

CPC (invention and additional information)

C08B 15/06 (2013.01)

Citation (search report)

See references of WO 9950306A1

Designated contracting state (EPC)

AT BE DE FI FR GB SE

EPO simple patent family

DE 19814138 A1 19991014; AU 3600599 A 19991018; EP 1082347 A1 20010314; WO 9950306 A1 19991007

INPADOC legal status


2003-04-16 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20021001

2001-04-11 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20010226

2001-03-14 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20001020

2001-03-14 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE DE FI FR GB SE