US3879377A
Expired / Lapsed
US
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Purification of chitin
Assignee: University of Delaware
•
Filing: 1973-11-23
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Granted: 1975-04-22
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Expires: 1993-11-23
Abstract
Abstract New solvents for chitin have been discovered comprising a 1, 2chloroalcohol in admixture with an acidic solvent, particularly a mineral acid, and a method for purifying the chitin and regenerating it from solution in the form of powdered chitin and/or crystalline fibrils.
Inventors
- 👤 Paul Rolland Austin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:10
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/0006; C08B37/0024; C08B37/0027; C08B37/003
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
30 words
A SOLUTION OF CHITIN IN A MIXTURE OF A 1,2-CHLOROALCOHOL WITH AN AQUEOUS SOLUTION OF A STRONG INORGANIC ACID OR WITH AN ORGANIC ACID HAVING ONE OR TWO CARBON ATOMS.
Claim 2
Dependent Claim
30 words
A SOLUTION OF CHITIN IN A MIXTURE OF A 1,2-CHLOROALCOHOL WITH AN AQUEOUS SOLUTION OF A STRONG INORGANIC ACID OR WITH AN ORGANIC ACID HAVING ONE OR TWO CARBON ATOMS.
Claim 3
Dependent Claim
30 words
A solution of chitin in a mixture of a 1,2-chloroalcohol with an aqueous solution of a strong inorganic acid or with an organic acid having one or two carbon atoms.
Claim 4
Dependent Claim
30 words
A solution of chitin in a mixture of a 1,2-chloroalcohol with an aqueous solution of a strong inorganic acid or with an organic acid having one or two carbon atoms.
Claim 5
Dependent Claim
15 words
The solution of claim 1, wherein the 1,2-chloroalcohol is a mixture of 1-chloro-2-propanol and 2-chloro-1-propanol.
Claim 6
Dependent Claim
10 words
The solution of claim 1, wherein the 1,2-chloroalcohol is 2-chloroethanol.
Claim 7
Dependent Claim
86 words
A process for purifying chitin which consists essentially of forming a solution of chitin in a solvent consisting essentially of a 1,2-chloroalcohol and a strong inorganic acid or an organic acid having one or two carbon atoms, at a moderate temperature below 129*C for a period of 8 hours or less, separating the undissolved material from the solution to remove the undissolved material and diluting the solution with a miscible non-solvent for the chitin to precipitate the chitin from solution to form crystalline fibrils of chitin.
Claim 8
Dependent Claim
86 words
A process for purifying chitin which consists essentially of forming a solution of chitin in a solvent consisting essentially of a 1,2-chloroalcohol and a strong inorganic acid or an organic acid having one or two carbon atoms, at a moderate temperature below 129*C for a period of 8 hours or less, separating the undissolved material from the solution to remove the undissolved material and diluting the solution with a miscible non-solvent for the chitin to precipitate the chitin from solution to form crystalline fibrils of chitin.
Claim 9
Dependent Claim
19 words
The process of claim 4, wherein the chitin is precipitated by addition of water, methanol or aqueous ammonium hydroxide.
Claim 10
Dependent Claim
14 words
The solution of claim 1 wherein the inorganic acid is 58-85 percent sulfuric acid.
References Cited (Backward Citations)
US2783148A
Cited
US3089821A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |