Process for the preparation of phosphoric monoester
US6407277B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 9, 1997 |
| Grant date | Jun 18, 2002 |
| Priority date | — |
| Expiry date | Jun 9, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/09
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
An organic hydroxyl compound is reacted with a phosphorylating agent comprising phosphorus pentaoxide and at least one compound selected from the group consisting of water, phosphoric acid and polyphosphoric acid and having a value represented by formula (I) of from 0.5 to 1.0, under such a condition that the ratio as defined by formula (II) has a value in the range of from 2.8 to 3.2; or alternatively, an organic hydroxyl compound is reacted with the above phosphorylating agent under such a condition that the ratio as defined by formula (II) has a value in the range of from exceeding 3.2 up to 6.4 and then phosphorus pentaoxide is added to the reaction product in such an amount that the ratio as defined by formula (II) has a value in the range of from 2.8 to 3.2 with respect to the total feeds of the starting materials to conduct further reaction. Said process enables the preparation of a phosphoric ester mixture which is excellent in hue and odor, is reduced in the amount of orthophosphoric acid formed as a by-product and contains a phosphoric monoester useful as the component of detergent in an increased amount.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.