Process for the simultaneous production of different mixtures of diisocyanate isomers of the diphenylmethane series
US8779182B2 · kind B2 · utility
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Key dates
| Filing date | Oct 1, 2009 |
| Grant date | Jul 15, 2014 |
| Priority date | — |
| Expiry date | Nov 15, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C265/14
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Process for the simultaneous and continuous production of two different mixtures of predominantly 4,4′-MDI and 2,4′-MDI in a single-step suspension melt crystallisation process whereby a mixed diisocyanate feed stream [MIx] is used to produce simultaneously two mixed diisocyanate streams [MIy] and [MIz] wherein x=80 to 92, y=97 to 99 and z=60 to 80 preferably x=82 to 88, y=97.2 to 98.5 and z=63 to 70 where x, y and z are percentages by weight of the 4,4′-MDI isomer contained in the diisocyanate isomer mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.