US3664930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the regeneration of alkanolamines by distillation, alkali hydroxide treatment, heat, phase separation and distillation
Assignee: UCB SA
•
Filing: 1969-03-11
•
Granted: 1972-05-23
•
Expires: 1989-03-11
Abstract
Abstract A process for the regeneration of dialkanolamines from their thermostable degradation products with impurities of gases, formed during the washing of said gases with dialkanolaminecontaining washing liquors, which comprises adding to the concentrated distillation residues containing said degradation products a 15 to 25% aqueous sodium hydroxide solution or a 25 to 35% aqueous potassium hydroxide solution, either containing the stoichiometric quantity of 100% NaOH or KOH, heating to boiling for at least 15 minutes whereupon two phases are obtained, an aqueous and an organic, decanting the latter and distilling it to eliminate alkali and excess water and recycling the regenerated alkanolamine to the gases washing stage.
Inventors
- 👤 Fernand Pottiez
- 👤 Raphael Verbeest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:27
CPC Classifications
C; C10; C10K; C10K1/00; C10K1/08; C10K1/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
12 words
A process as claimed in claim 1, wherein the alkanolamine is diisopropanolamine.
Claim 2
Dependent Claim
17 words
A process as claimed in claim 1, wherein a physical solvent is present in said washing liquor.
Claim 3
Dependent Claim
18 words
A process as claimed in claim 3, wherein the physical solvent is a dimethyl ether of a polyethyleneglycol.
Claim 4
Dependent Claim
17 words
A process as claimed in claim 3, wherein the physical solvent is a dimethyl ether of diethyleneglycol.
Claim 5
Dependent Claim
13 words
A process as claimed in claim 3, wherein the physical solvent is sulfolane.
Claim 6
Dependent Claim
60 words
A process as claimed in claim 1, wherein the alkali metal hydroxide and water added are an aqueous solution of sodium hydroxide, the amount of water added to the distillation residue being adjusted in such a manner that the sodium hydroxide is present in the form of an aqueous solution containing 15 to 25 percent by weight of sodium hydroxide.
Claim 7
Dependent Claim
58 words
A process as claimed in claim 1, wherein the alkali metal hydroxide and water added are an aqueous solution of sodium hydroxide, the amount of water added to the distillation residue being adjusted in such a manner that the sodium hydroxide is present in the form of an aqueous solution containing 20 percent by weight of sodium hydroxide.
Claim 8
Dependent Claim
58 words
A process as claimed in claim 1, wherein the alkali metal hydroxide and water added are an aqueous solution of potassium hydroxide, the amount of water added to the distillation residue being adjusted in such a manner that the potassium hydroxide is present in the form of an aqueous solution containing 25-35 percent by weight of potassium hydroxide.
Claim 9
Dependent Claim
58 words
A process as claimed in claim 1, wherein the alkali metal hydroxide and water added is an aqueous solution of potassium hydroxide, the amount of water added to the distillation residue being adjusted in such a manner that the potassium hydroxide is present in the form of an aqueous solution containing 30 percent by weight of potassium hydroxide.
Claim 10
Dependent Claim
25 words
A process as claimed in claim 1, wherein said heating is carried out at the boiling temperature of the said mixture under normal pressure conditions.
Claim 11
Dependent Claim
18 words
A process as claimed in claim 1, wherein the duration of said heating is at least 15 minutes.
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |