Bis-bibenzimidazole composition
US5258524A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 1992 |
| Grant date | Nov 2, 1993 |
| Priority date | — |
| Expiry date | Feb 28, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/14
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A composition of bibenzimidazoles of the Formula (I): ##STR1## wherein X & Y which may be the same or different and, taken together, contain a total of from 12 to 52 saturated carbon atoms, are (a) each selected from --R, --COR, --CH.sub.2 COOR, --CH(COOR).sub.2 and --COOR; or (b) together form a group selected from ##STR2## wherein R is an optionally substituted hydrocarbyl group, PA0 A & B taken together with the two carbon atoms to which they are linked form an optionally substituted benzene ring; and PA0 C & D taken together with the two carbon atoms to which they are linked form an optionally substituted benzene ring; characterised in that at least 50% by weight of the bibenzimidazoles in the composition are of Formula (II) ##STR3## wherein X and Y are as hereinbefore defined; PA0 T, U, V & W which may be the same or different, are H, R.sup.1 or OR.sup.1 provided at least one of T, U, V & W is R.sup.1 or OR.sup.1 ; PA0 and R.sup.1 is C.sub.1-6 -alkyl; which are suitable for use in the extraction of zinc from aqueous solutions of zinc in the presence of other metals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.