EP 1427691 A1 20040616 - METHOD FOR MAKING ADIPIC ACID CRYSTALS AND RESULTING CRYSTALS
Title (en)
METHOD FOR MAKING ADIPIC ACID CRYSTALS AND RESULTING CRYSTALS
Title (de)
VERFAHREN ZUR HERSTELLUNG VON ADIPINSÄUREKRISTALLEN UND DIE SO ERHALTENEN KRISTALLE
Title (fr)
PROCEDE DE FABRICATION DE CRISTAUX D'ACIDE ADIPIQUE ET CRISTAUX AINSI OBTENUS
Publication
Application
Priority
- FR 0203167 W 20020917
- FR 0112039 A 20010918
Abstract (en)
[origin: FR2829761A1] Adipic acid crystals characterized in that the concentration of exchangeable water is less than 100 ppm. Adipic acid crystals are characterized in that the concentration of exchangeable water is less than 100 ppm. This is measured as follows: The crystals (300 g) are placed in a hermetic container pre-purged with dry air and with water absorbent material (2 g), the container being maintained at 5 - 25 deg C for 24 hours. The water concentration is the amount of water absorbed by the absorbent per gram of crystals. The total water concentration is greater than the exchangeable water by at least 20 ppm. An Independent claim is also included for the preparation of the crystals which involves subjecting the crystals to a maturation process in an atmosphere of humidity less than 20 g/Nm<3>.
IPC 1-7
IPC 8 full level
C07C 55/14 (2006.01); C07C 51/42 (2006.01); C07C 51/43 (2006.01)
CPC (source: EP KR US)
C07C 51/43 (2013.01 - EP KR US)
Citation (search report)
See references of WO 03024912A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
DOCDB simple family (publication)
FR 2829761 A1 20030321; FR 2829761 B1 20040220; BR 0212885 A 20041013; CN 1296339 C 20070124; CN 1555354 A 20041215; EP 1427691 A1 20040616; JP 2005503408 A 20050203; KR 100653148 B1 20061201; KR 20040044945 A 20040531; RU 2004111678 A 20050910; RU 2269507 C2 20060210; UA 74475 C2 20051215; US 2004242927 A1 20041202; WO 03024912 A1 20030327
DOCDB simple family (application)
FR 0112039 A 20010918; BR 0212885 A 20020917; CN 02818315 A 20020917; EP 02779638 A 20020917; FR 0203167 W 20020917; JP 2003528760 A 20020917; KR 20047003958 A 20020917; RU 2004111678 A 20020917; UA 200432033 A 20020917; US 48988204 A 20040317