Patent US4757756A successfully refreshed from Google Patents.
Patent US4025429A successfully refreshed from Google Patents.
US4025429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the purification of industrial effluent
Assignee: Novartis Corp
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Filing: 1975-09-19
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Granted: 1977-05-24
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Expires: 1995-09-19
Abstract
Abstract The present invention relates to a process for the purification of effluent which results in the textile, paper and leather industries and in the manufacture of dyestuffs, and which contains water-soluble, anionic dyestuffs or optical brighteners, the said process comprising the addition of a water-soluble formaldehyde condensation product to the said effluent and the subsequent removal of the occurring flocculate from the effluent.
Inventors
- 👤 Heinz Neuschutz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:59
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5236; C02F1/54; Y; Y10; Y10S; Y10S210/00; Y10S210/928
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
108 words
A process for the purification of aqueous effluent which results in the textile, paper and leather industries and in the manufacture of dyestuffs and optical brighteners, and which contain water-soluble, anionic dyestuffs or optical brighteners, said process comprising mixing said effluent with a water-soluble condensation product from dicyandiamide, formaldehyde, ethylene diamine and ammonium chloride in a ratio of 2.2 moles of formaldehyde, 1.3 moles of ethylene diamine and 0.8 moles of ammonium chloride per mole of dicyandiamide, in an amount corresponding to 0.03 to 3 grams of said condensation product per gram of dyestuff and optical brightener, and the subsequent removal of the occurring flocculate from the effluent.
Claim 2
Dependent Claim
108 words
A process for the purification of aqueous effluent which results in the textile, paper and leather industries and in the manufacture of dyestuffs and optical brighteners, and which contain water-soluble, anionic dyestuffs or optical brighteners, said process comprising mixing said effluent with a water-soluble condensation product from dicyandiamide, formaldehyde, ethylene diamine and ammonium chloride in a ratio of 2.2 moles of formaldehyde, 1.3 moles of ethylene diamine and 0.8 moles of ammonium chloride per mole of dicyandiamide, in an amount corresponding to 0.03 to 3 grams of said condensation product per gram of dyestuff and optical brightener, and the subsequent removal of the occurring flocculate from the effluent.
Claim 3
Dependent Claim
16 words
The process according to claim 1, wherein the effluent is purified at 10 to 100° C.
Claim 4
Dependent Claim
16 words
The process according to claim 2, wherein the effluent is purified at 10 to 30° C.
Claim 5
Dependent Claim
15 words
The process according to claim 1, wherein an iron salt is added to the effluent.
Claim 6
Dependent Claim
74 words
A flocculant composition for the purification of effluent which results in the textile, paper and leather industries and in the manufacture of dyestuffs and optical brighteners, and which contains water-soluble, anionic dyestuffs or optical brighteners, said flocculant composition containing a water-soluble cndensation product from dicyandiamide, formaldehyde, ethylene diamine and ammonium chloride in a ratio of 2.2 moles of formaldehyde, 1.3 moles of ethylene diamine, and 0.8 moles of ammonium chloride per mole of dicyandiamide.
Claim 7
Dependent Claim
74 words
A flocculant composition for the purification of effluent which results in the textile, paper and leather industries and in the manufacture of dyestuffs and optical brighteners, and which contains water-soluble, anionic dyestuffs or optical brighteners, said flocculant composition containing a water-soluble cndensation product from dicyandiamide, formaldehyde, ethylene diamine and ammonium chloride in a ratio of 2.2 moles of formaldehyde, 1.3 moles of ethylene diamine, and 0.8 moles of ammonium chloride per mole of dicyandiamide.
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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 |