Humectant composition derived from kraft black liquor
US4629469A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 11, 1985 |
| Grant date | Dec 16, 1986 |
| Priority date | — |
| Expiry date | Oct 11, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K23/50
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Method of producing a by-product of the black liquor residue of a kraft wood pulping process having excellent product stability and exhibiting humectant properties in dyestuff compositions, and the resultant humectant product and dyestuff compositions containing such humectant product. The black liquor, after removal of tall oil fractions, is oxidized and thereafter treated with an aldehyde to methylolate the lignin components therein, the methylolated lignin-containing black liquor is treated with a sulfur-oxygen-containing compound, such as SO.sub.2 gas, under sufficient conditions to sulfomethylate and solubilize the lignin components, and the resultant composition is concentrated to a solids content of from about 50% to up to about 70% at a pH of approximately 7.5 to produce the final humectant product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.