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US4263146A
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Process for removing cationic substances from aqueous solutions
Assignee: BASF Corp
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Filing: 1979-06-21
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Granted: 1981-04-21
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Expires: 1999-06-21
Abstract
Abstract A process for removing cationic substances from an aqueous solution, which comprises bringing the solution into contact with a cellulose-containing material which has been chemically modified anionically and in which the anionic constituent is bonded to the cellulose moiety by a grouping of the general formula --O--CH.sub.2 --N< wherein the nitrogen belongs to an amide group of the anionic constituent and the oxygen atom is bonded to the cellulose.
Inventors
- 👤 Hans Wegmuller
- 👤 Rudolf F. Wurster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:33
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/286; B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/22; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/14; C08B11/145
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
72 words
A process for removing cationic substances from an aqueous solution, which comprises bringing the solution into contact with a cellulose-containing material which has been chemically modified anionically, the anionic constituent of which is bonded to the cellulose moiety by a grouping of the general formula --O--CH.sub.2 --N< (1) wherein the nitrogen atom is part of an amide group of the anionic constituent and the oxygen atom is bonded to the cellulose moiety.
Claim 2
Dependent Claim
72 words
A process for removing cationic substances from an aqueous solution, which comprises bringing the solution into contact with a cellulose-containing material which has been chemically modified anionically, the anionic constituent of which is bonded to the cellulose moiety by a grouping of the general formula --O--CH.sub.2 --N< (1) wherein the nitrogen atom is part of an amide group of the anionic constituent and the oxygen atom is bonded to the cellulose moiety.
Claim 3
Dependent Claim
84 words
A process according to claim 1, wherein the anionic constituent of the modified cellulose material is bonded to the cellulose moiety via a grouping of the formula ##STR17## wherein X is a divalent bridge --CO--, --CO--O--, --CS--, ##STR18## or --SO 2 -- or a carbon atom which is a constituent of a nitrogen-containing heterocyclic ring and is adjacent to a ring nitrogen, Y, Y' and R are each hydrogen or an organic radical and m and m' are in each case 1 or 2.
Claim 4
Dependent Claim
55 words
A process according to claim 2, wherein the anionic constituent of the modified cellulose material is bonded to the cellulose moiety by a grouping of the formula (2) in which Y and Y' are each hydrogen, lower alkyl or --CH 2 O(R 1 ) and R and R 1 are each hydrogen or lower alkyl.
Claim 5
Dependent Claim
35 words
A process according to claim 2, wherein the anionic constituent of the modified cellulose material is bonded to the cellulose moiety by a grouping of the formula (2) in which X is the --CO-- group.
Claim 6
Dependent Claim
97 words
A process according to claim 4, wherein the anionic constituent of the modified material is derived from a free or etherified methylol compound of the formula ##STR19## wherein Y 1 is hydrogen, lower alkyl or --CH 2 --O--R 1 , R 1 and R 2 independently of one another are hydrogen or lower alkyl, Q is C 1 -C 8 -alkylene which is unsubstituted or substituted by a substituent selected from the group consisting of lower alkyl, phenyl, --COOH and the group of the formula ##STR20## and Z is a sulfonic acid group or phosphonic acid group.
Claim 7
Dependent Claim
32 words
A process according to claim 5, wherein the anionic constituent of the modified cellulose material is derived from a methylolamide compound of the formula (4), wherein Z is a sulfonic acid group.
Claim 8
Dependent Claim
33 words
A process according to claim 5, wherein the anionic constituent of the modified cellulose material is derived from a methylolamide compound of the formula (4) wherein Q is C 1 -C 3 -alkylene.
Claim 9
Dependent Claim
58 words
A process according to claim 5, wherein the anionic constituent of the modified cellulose material is derived from a methylolamide compound of the formula ##STR21## wherein Q 1 is C 1 -C 3 -alkylene or C 1 -C 3 -alkylene which is substituted by --COOH or the group of the formula ##STR22## and R 1 ' is hydrogen.
Claim 10
Dependent Claim
52 words
A process according to claim 8, wherein the anionic constituent of the modified cellulose material is derived from a methylolamide compound of the formula (6) in which Q 1 is C 1 -C 3 -alkylene, Z 1 is --SO 3 H, R 2 is hydrogen or methyl and Y 1 is hydrogen.
Claim 11
Dependent Claim
44 words
A process according to claim 1, wherein the anionic constituent of the modified cellulose material is derived from a melamine compound or urea compound which contains at least one free or etherified methylol group and at least one sulfo-C 1 -C 3 -alkyl group.
Claim 12
Dependent Claim
104 words
A process according to claim 10, wherein the anionic constituent of the modified cellulose material is derived from a free or etherified N-methylolmelamine of the formula ##STR23## in which W is hydrogen, --CH 2 O--R 2 or --Q 2 --SO 3 M, Y 1 is hydrogen, lower alkyl, --CH 2 --O--R 1 or --Q 2 --SO 3 M, Y 2 and Y 3 independently of one another are hydrogen, lower alkyl or --CH 2 --O--R 1 , R 1 and R 2 are each hydrogen or lower alkyl, Q 2 is C 1 -C 3 -alkylene and M is hydrogen, sodium, potassium or ammonium.
Claim 13
Dependent Claim
38 words
A process according to claim 11, wherein the anionic constituent of the modified cellulose material is derived from a methylolmelamine of the formula (7) in which Y 1 is hydrogen, lower alkyl or --CH 2 OR 1 .
Claim 14
Dependent Claim
29 words
A process according to claim 1, wherein the cationic substances are cationic dyes, fluorescent brighteners, textile assistants or dyeing assistants, surfactants, tanning agents or mixtures of these cationic substances.
Claim 15
Dependent Claim
21 words
A process according to claim 1, wherein the removal of the cationic substances is carried out at 10° to 150° C.
Claim 16
Dependent Claim
21 words
A process according to claim 14 wherein the removal of the cationic substances is carried out at 20° to 100° C.
Claim 17
Dependent Claim
26 words
A process according to claim 1, wherein the removal of the cationic substances is carried out in a stirred process or in a fixed bed process.
Claim 18
Dependent Claim
17 words
A process according to claim 1, wherein the anionically modified cellulose-containing material is mixed with active charcoal.
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) | 1984-04-20 | 1984-10-20 | 1985-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-20 | 1988-10-20 | 1989-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-20 | 1992-10-20 | 1993-04-21 | $7700.00 | Window Closed / Lapsed |