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US4277626A
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Method for the isolation of vanillin from lignin in alkaline solutions
Assignee: Individual
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Filing: 1980-01-24
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Granted: 1981-07-07
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Expires: 2000-01-24
Abstract
Abstract This invention relates to a method for the separation of low molecular-weight aromatic compounds, e.g. vanillin and dehydrodivanillin, from lignin, alkali, and from each other, in alkaline aqueous solutions. According to the method, the separation is effected by means of a cationic ion-exchange resin in its sodium salt form, e.g. of a strong sulphonic acid type or weak carbonic acid type, from which the substances adsorbed are removed by elution. The resin may be crosslinked to the extent of 2-16% divinylbenzene. The substances adsorbed onto the ion-exchange resin are appropriately eluted by either water alone, or by application of an aqueous sodium-salt solution (e.g. Na 2 CO 3 ) followed by water.
Inventors
- 👤 Kaj G. Forss
- 👤 Esko T. Talka
- 👤 Kaj-Erik Fremer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:09
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/78; C07C45/79; B; B01; B01J; B01J47/00; B01J47/014; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/908; Y10S210/909
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
103 words
A method for the separation of sodium vanillate from lignin and alkali in alkaline aqueous solutions, comprising the steps of feeding an alkaline aqueous solution containing sodium vanillate and a material selected from the group of lignin and alkali into a bed of a cation exchange resin in its sodium salt form, said sodium vanillate and said material being adsorbed on the resin at different strength levels, and eluting the adsorbed sodium vanillate and said material from the resin by aqueous solution, said sodium vanillate being collected primarily in one elution volume and said material being collected primarily in a second elution volume.
Claim 2
Independent Claim
103 words
A method for the separation of sodium vanillate from lignin and alkali in alkaline aqueous solutions, comprising the steps of feeding an alkaline aqueous solution containing sodium vanillate and a material selected from the group of lignin and alkali into a bed of a cation exchange resin in its sodium salt form, said sodium vanillate and said material being adsorbed on the resin at different strength levels, and eluting the adsorbed sodium vanillate and said material from the resin by aqueous solution, said sodium vanillate being collected primarily in one elution volume and said material being collected primarily in a second elution volume.
Claim 3
Dependent Claim
28 words
The method of claim 1, comprising the step of eluting the sodium vanillate and said material from the resin with an aqueous sodium salt solution, followed by water.
Claim 4
Dependent Claim
27 words
The method of claim 1, and including the step of eluting the sodium vanillate and said material from the resin with an aqueous solution of sodium carbonate
Claim 5
Dependent Claim
26 words
The method of claim 1, and including the step of utilizing a strong sulphonic acid-type cation exchange resin to adsorb said sodium vanillate and said material.
Claim 6
Dependent Claim
27 words
The method of claim 1, and including the step of utilizing a macroporous metacrylic acid-type weak cationic exchange resin to adsorb said sodium vanillate and said material.
Claim 7
Dependent Claim
22 words
The method of claim 1, and including the step of maintaining the pH of said aqueous solution at a value above 12.0.
References Cited (Backward Citations)
US3197359A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-06 | 1985-01-05 | 1985-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-06 | 1989-01-05 | 1989-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-06 | 1993-01-05 | 1993-07-07 | $7700.00 | Window Closed / Lapsed |