Process for the purification of 1,10-decanedicarboxylic acid
US4067779A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1975 |
| Grant date | Jan 10, 1978 |
| Priority date | — |
| Expiry date | Apr 29, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L63/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Crude 1,10-decanedicarboxylic acid produced by the nitric acid oxidation at 20.degree.14 60.degree. C. of cyclododecanone, cyclododecanol or a mixture thereof can be purified by distillation to a purity suitable for use in the production of polyamides and polyesters by reducing prior to distillation, e.g., by heating to 70.degree.-90.degree. C., the organically bound nitrogen content and as required the nitric acid content, e.g., by washing, and water content thereof so that the sample which is distilled has maximum contents thereof of 0.05%, 0.02% and 0.1% by weight, respectively, and distilling the pre-purified sample at a sump temperature of 215.degree.-225.degree. C. and at a pressure of 0.5 - 2 torr.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.