Manufacturing process for dihydroxydiphenylmethane with high selectivity for 2,4′-dihydroxydiphenylmethane
US10683250B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Sep 20, 2013 |
| Grant date | Jun 16, 2020 |
| Priority date | — |
| Expiry date | Oct 28, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C37/20
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to an improved manufacturing process for the preparation of high 2,4′-dihydroxydiphenylmethane, by a process involving reaction of phenol and formaldehyde, in the presence of an inorganic polyprotic acid. According to this process, the reaction conditions are selected to favour a high yield of dihydroxydiphenylmethane, with a relatively high concentration of the 2,4′-isomer, by using a relatively low molar excess of phenol than conventional methods.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.