US4025428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the purification of industrial effluents
Assignee: Novartis Corp
•
Filing: 1975-05-07
•
Granted: 1977-05-24
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Expires: 1995-05-07
Abstract
Abstract A novel process for purifying industrial effluents which comprises bringing said effluents into contact with cellulosic absorbent which has been pretreated with precipitants.
Inventors
- 👤 Hans Wegmuller
- 👤 Jaroslav Haase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:46
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/286; C02F1/288; C02F1/52; C02F1/5263; C02F1/54
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
63 words
A process for purifying industrial waste water effluents containing residual substances selected from the group consisting of dyestuffs, optical brighteners, dyeing auxiliaries, detergents and tanning agents, which comprises bringing said effluents into contact with a cellulosic absorbent which is pretreated with a polymer associate of (1) polyamidopolyamines produced by condensation of a polymeric fatty acid and a polyamine, and (2) a polyanionic polymer.
Claim 2
Dependent Claim
63 words
A process for purifying industrial waste water effluents containing residual substances selected from the group consisting of dyestuffs, optical brighteners, dyeing auxiliaries, detergents and tanning agents, which comprises bringing said effluents into contact with a cellulosic absorbent which is pretreated with a polymer associate of (1) polyamidopolyamines produced by condensation of a polymeric fatty acid and a polyamine, and (2) a polyanionic polymer.
Claim 3
Dependent Claim
37 words
A process according to claim 1, wherein the polymeric fatty acid is an aliphatic ethylenically unsaturated dimeric to trimeric fatty acid of a monocarboxylic acid having 16 to 22 carbon atoms and the polyamine is a polyalkylenepolyamine.
Claim 4
Dependent Claim
20 words
A process according to claim 2, wherein the purification of the effluents is carried out at 10° to 150° C.
Claim 5
Dependent Claim
20 words
A process according to claim 2, wherein the cellulosic material contains 0.5 to 20 percent by weight of polymer associate.
Claim 6
Dependent Claim
20 words
A process according to claim 2, wherein the liquor subject to purification is conducted through a filter-like cellulosic adsorption material.
Claim 7
Dependent Claim
27 words
A process according to claim 2, wherein the polyamido-polyamine has an amine value in the range of 200 to 650 milligrams of potassium hydroxide per gram polyamidpolyamine.
Claim 8
Dependent Claim
24 words
A process according to claim 2, wherein the polyamionic polymer is an optionally substituted homopolymer or copolymer of an aliphatic, α,β-ethylenically unsaturated carboxylic acid.
Claim 9
Dependent Claim
13 words
A process according to claim 7, wherein the polyanionic polymer is polymethacrylic acid.
Claim 10
Dependent Claim
20 words
A process according to claim 2, wherein the cellulosic absorbent is additionally pretreated with a salt of a polyvalent metal.
Claim 11
Dependent Claim
29 words
A process according to claim 2, wherein the cellulosic absorbent is additionally pretreated with a salt of a polyvalent metal in the presence of an inorganic or organic base.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |