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US4330480A
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US
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Preparation of aminoalkyl half-esters of sulfuric acid
Assignee: BASF SE
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Filing: 1981-02-04
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Granted: 1982-05-18
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Expires: 2001-02-04
Abstract
Abstract A process for the preparation of an aminoalkyl half-ester of sulfuric acid by simultaneously adding an aminoalkanol and sulfuric acid to a suspending medium, boiling at 70°-150° C., with vigorous mixing, distilling off the water formed during the reaction, and any water introduced with the starting materials, together with a part of the suspending medium, as an azeotrope, separating off the water from the condensed azeotrope and recycling the suspending medium, as a gas, to the reaction mixture.
Inventors
- 👤 Otto Hertel
- 👤 Karl-Heinz Beyer
- 👤 Albrecht H. Wallis
- 👤 Klaus Wulz
- 👤 Kamuran Izi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:22
CPC Classifications
C; C07; C07C; C07C305/00; C07C305/02; C07C305/04; C07C305/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
105 words
A process for the preparation of an aminoalkyl half-ester of sulfuric acid, comprising; simultaneously adding an aminoalkanol and sulfuric acid to a suspending medium, boiling at 70°-150° C., with vigorous mixing, distilling off the water formed during the reaction, and any water introduced with the starting materials, together with a part of the suspending medium, as an azeotrope, separating off the water from the condensed azeotrope, vaporizing the suspending medium and recycling the gaseous suspending medium to the reaction mixture, and introducing fresh suspending medium, as a gas, into the reaction mixture in order to compensate for the suspending medium which has been distilled off.
Claim 2
Dependent Claim
105 words
A process for the preparation of an aminoalkyl half-ester of sulfuric acid, comprising; simultaneously adding an aminoalkanol and sulfuric acid to a suspending medium, boiling at 70°-150° C., with vigorous mixing, distilling off the water formed during the reaction, and any water introduced with the starting materials, together with a part of the suspending medium, as an azeotrope, separating off the water from the condensed azeotrope, vaporizing the suspending medium and recycling the gaseous suspending medium to the reaction mixture, and introducing fresh suspending medium, as a gas, into the reaction mixture in order to compensate for the suspending medium which has been distilled off.
Claim 3
Dependent Claim
22 words
A process as set forth in claim 1, wherein the recycled gaseous suspending medium is superheated before introduction into the reaction mixture.
Claim 4
Dependent Claim
22 words
A process as claimed in claim 1, wherein the temperature of the recycled gaseous suspending medium is from 110° to 200° C.
Claim 5
Dependent Claim
13 words
A process as set forth in claim 1, wherein said aminoalkanol is ethanolamine.
Claim 6
Dependent Claim
22 words
A process as set forth in claim 1, wherein the ratio of aminoalkanol to sulfuric acid is kept constant during the reaction.
Claim 7
Dependent Claim
23 words
A process as set forth in claim 1, wherein the temperature of the recycled gaseous suspending medium is from 130° to 160° C.
Claim 8
Dependent Claim
30 words
A process as set forth in claim 1, wherein said gaseous suspending medium is introduced into the reaction chamber at several inlet points at the bottom of the reaction vessel.
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) | 1985-05-17 | 1985-11-16 | 1986-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-17 | 1989-11-16 | 1990-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-17 | 1993-11-16 | 1994-05-18 | $7700.00 | Window Closed / Lapsed |