Novel filter aid compositions for improving the limiting filterability temperature and inhibition of n-paraffin crystal formation during low temperature of middle distillates
US4367074A · kind A · utility
9Cited by
6References
13Claims
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Key dates
| Filing date | Sep 16, 1981 |
| Grant date | Jan 4, 1983 |
| Priority date | — |
| Expiry date | Sep 16, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10L1/224
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Novel filter aid compositions enabling the improvement of limiting filterability temperature and the simultaneous inhibition of settling of the n-paraffin crystals formed at low temperature, comprising a mixture: PA1 of a compound A chosen from among the group of polymers or copolymers having a molecular weight between 500 and 15000 and having a branching rate between 10 and 30 points per 100 carbon atoms; PA1 and a compound B resulting from the condensation of at least one cyclic anhydride and at least one linear N-alkyl-polyamine; the weight ratio between these constituents A and B being from 1:20 to 20:1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.