| PATENT ASSIGNEE'S COUNTRY | Germany |
| UPDATE | 06.99 |
| PATENT ASSIGNEE | This data is not available for free |
| PATENT CLAIMS |
Method for the work-up of reaction mixt. present as a microemulsion at 0 - 100C & formed in the O-alkylation of phenols by an alkyl halide in presence of NaOH, said phenols being present during O-alkylation as an aq. soln & alkyl halide being present as water-immiscible soln in an organic solvent, said alkylation taking place in the presence of a nonionic surfactant & said reaction mixt. contg. in addition to said surfactant a first reaction prodt which is soluble in water & second reaction prodt which is insoluble in water & soluble in organic solvent, said microemulsion being able to be present in coexistence with said aq. & said organic soln. wherein reaction mixt. - Is subjected to T decrease by 20 - 50K & by this means an aq. phase having high surfactant content & surfactant-free organic phase are obtained - The organic phase contg said second reaction prodt is se parated off & is replaced by additional organic soln of alkyl halide - Resultant reaction mixt is subjected to T increase by 10 - 80 K whereupon surfactant free aq. phase & organic phase with high surfactant content are obtained - The surfactant free aq. phase contg first reaction prodt., is separated off & replaced by additional aq. soln. of said phe nols, thereby reforming original reaction mixt. of phenols & alkyl halide, the O-alkylation is repeated & the foregoing work-up process is repeated |
| PATENT PHOTOCOPY | Available on request |
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