Title:
【発明の名称】アジピン酸を回収する方法
Document Type and Number:
Japanese Patent JP3085776
Kind Code:
B2
Abstract:
In a novel process for the recovery of adipic acid from the aqueous mother liquor, arising in the industrial manufacture of adipic acid, by selective crystallisation of the dissolved adipic acid, such a quantity of an aqueous adipic acid solution having an adipic acid content of 0.5 to 6% by weight is added to the mother liquor within the temperature range from 30 to 60 DEG C that the nitric acid content of the mixture, without allowing for the organic constituents, calculated as HNO3 is lowered from 52-60% by weight to 35-50% by weight, the mixture is then cooled within a period of 0.5 to 5 hours by at least 5 DEG C, the adipic acid thus crystallising out is isolated by filtration and the filtrate obtained is passed to glutaric acid preparation by distillation.
Inventors:
Peter Vogtel
Georg Schyutainhof
Georg Schyutainhof
Application Number:
JP8032992A
Publication Date:
September 11, 2000
Filing Date:
March 03, 1992
Export Citation:
Assignee:
Bayer Actien Gezershyaft
International Classes:
C07C51/43; C07C55/14; (IPC1-7): C07C55/14; C07C51/43
Domestic Patent References:
| JP50125973A |
Other References:
【文献】米国特許3476805(US,A)
【文献】米国特許2713067(US,A)
【文献】米国特許2713067(US,A)
Attorney, Agent or Firm:
Kazuho Kawarada