Global Patent Index - EP 1071719 A1

EP 1071719 A1 2001-01-31 - METHOD FOR METERING A MIXTURE OF LIQUID AMMONIA AND AN ADDITIVE INTO A SOLID AND CORRESPONDING METERING DEVICE

Title (en)

METHOD FOR METERING A MIXTURE OF LIQUID AMMONIA AND AN ADDITIVE INTO A SOLID AND CORRESPONDING METERING DEVICE

Title (de)

VERFAHREN ZUR DOSIERUNG EINES GEMISCHES AUS FLÜSSIGEM AMMONIAK UND EINEM ZUSATZSTOFF IN EINEN FESTSTOFF UND DOSIERVORRICHTUNG

Title (fr)

PROCEDE DE DOSAGE D'UN MELANGE CONSTITUE D'UN AMMONIAC LIQUIDE ET D'UN ADDITIF AMENE A UN SOLIDE, ET DISPOSITIF DE DOSAGE

Publication

EP 1071719 A1 (DE)

Application

EP 99914489 A

Priority

  • DE 19810740 A
  • EP 9901483 W

Abstract (en)

[origin: DE19810740A1] A semi-continuous process for reacting a solid polysaccharide material, e.g. cellulose, with an additive compound such as urea in anhydrous liquid ammonia medium. The solid polysaccharide is charged to a high pressure reactor (32) to which is then added a solution of urea in liquid ammonia, via a high pressure pump (22) from a first charge make-up vessel (14). The reactor is sealed by closing inlet and outlet valves (41, 42) and either explosively initiated or impulse pressurized to 25-30 bar; the pressure is released, the reactor discharged, recharged with cellulose, and re-dosed with ammonia/additive solution from a second charge-make-up vessel (16). The make-up, charging, pressurizing, and discharging operations can be repetitively performed, under computer control, on an approximate 2 minute cycle, with the preparation of the additive solution alternating between two or more vessels. An Independent claim is included for the plant for operation of the process, having at least, two storage, weigh vessels (10, 12) for liquid or solid additive materials, two heated make-up pressure vessels (14, 16), high pressure transfer pumps (22) suitable for ammonia, a reactor vessel (32) , plus interconnecting valves and pipework, and a control system.

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

C08B 1/00; B27K 5/00

IPC 8 full level (invention and additional information)

B01J 4/02 (2006.01); C08B 1/00 (2006.01); C08B 15/06 (2006.01); G01G 19/22 (2006.01)

CPC (invention and additional information)

G01G 19/22 (2013.01); B01J 4/02 (2013.01); C08B 1/00 (2013.01); C08B 15/06 (2013.01)

Citation (search report)

See references of WO 9947567A1

Designated contracting state (EPC)

AT BE DE FI FR GB SE

EPO simple patent family

DE 19810740 A1 19990916; AU 3329099 A 19991011; EP 1071719 A1 20010131; WO 9947567 A1 19990923; ZA 9901464 B 19990824

INPADOC legal status


2002-03-13 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20010829

2001-05-30 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20010418

2001-01-31 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000825

2001-01-31 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

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