US3948874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for removing lignin from tall oil
Assignee: Alfa Laval AB
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Filing: 1974-04-08
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Granted: 1976-04-06
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Expires: 1994-04-08
Abstract
Abstract Tall oil obtained by splitting sulphate soap with an acid, and which still contains acid splitting liquid residues after removal of splitting liquid, is subjected to a lignin-removing operation by drying the tall oil to free it from an additional quantity of splitting liquid, and thereafter separating lignin in solid form, together with an acid residue of salt crystals, from the tall oil thus dried.
Inventors
- 👤 Fredrik Teodor Emanuel Palmqvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:19
CPC Classifications
C; C09; C09F; C09F1/00; C09F1/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
83 words
In the treatment of tall oil which has been obtained by splitting sulphate soap with an acid and which, after removal of splitting liquid, still contains acid splitting liquid residues, the method for removing lignin from said tall oil which comprises subjecting the tall oil to a drying operation to free the tall oil from an additional quantity of splitting liquid, and thereafter mechanically separating lignin in solid form, together with an acid residue of salt crystals, from the tall oil thus dried.
Claim 2
Dependent Claim
83 words
In the treatment of tall oil which has been obtained by splitting sulphate soap with an acid and which, after removal of splitting liquid, still contains acid splitting liquid residues, the method for removing lignin from said tall oil which comprises subjecting the tall oil to a drying operation to free the tall oil from an additional quantity of splitting liquid, and thereafter mechanically separating lignin in solid form, together with an acid residue of salt crystals, from the tall oil thus dried.
Claim 3
Dependent Claim
20 words
The method of claim 1, in which said operation for drying the tall oil is carried out by vacuum evaporation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |