US4287069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the improved working up of effluent
Assignee: Bayer AG
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Filing: 1980-05-05
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Granted: 1981-09-01
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Expires: 2000-05-05
Abstract
Abstract The instant invention is directed to a process for the separation of aqueous sludges in the purification of effluents in purification plants, comprising: (a) mixing organic and/or inorganic aqueous sludges with ground monomer-free tolylene diisocyanate (TDI) distillation residues having a mean particle size of less than 2 mm; (b) removing the water from the resulting purified sludges; and (c) disposing of the purified sludges.
Inventors
- 👤 Artur Reischl
- 👤 Kurt Mack
- 👤 Friedhelm Sahlmen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:39
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C02F11/00; C02F11/12; Y; Y10; Y10S; Y10S210/00; Y10S210/918; Y10S210/919
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
58 words
A process for the separation of aqueous sludges in the purification of effluents in purification plants, comprising: (a) mixing organic and/or inorganic aqueous sludges with ground monomer-free tolylene diisocyanate (TDI) distillation residues having a mean particle size of less than 2 mm; (b) removing the water from the resulting purified sludges; and (c) disposing of the purified sludges.
Claim 2
Dependent Claim
58 words
A process for the separation of aqueous sludges in the purification of effluents in purification plants, comprising: (a) mixing organic and/or inorganic aqueous sludges with ground monomer-free tolylene diisocyanate (TDI) distillation residues having a mean particle size of less than 2 mm; (b) removing the water from the resulting purified sludges; and (c) disposing of the purified sludges.
Claim 3
Dependent Claim
16 words
The process of claim 1, wherein said TDI distillation residues have been prereacted with isocyanate-reactive compounds.
Claim 4
Dependent Claim
21 words
The process of claim 1, wherein said ground TDI distillation residues have a mean particle size of 1 mm or less.
Claim 5
Dependent Claim
21 words
The process of claim 3, wherein said ground TDI distillation residues have a mean particle size of 0.03 to 0.8 mm.
Claim 6
Dependent Claim
22 words
The process of claim 1, wherein said TDI distillation residues are denatured by adding to water with a temperature above 130° C.
Claim 7
Dependent Claim
22 words
The process of claim 1, wherein the isocyanate groups of said TDI distillation residues are completely reacted with water and/or isocyanate-reactive compounds.
Claim 8
Dependent Claim
15 words
The process of claim 1, wherein said TDI distillation residues contain cationic and/or anionic groups.
Claim 9
Dependent Claim
27 words
The process of claim 1, wherein said TDI distillation residues are added in a quantity of from 10 to 80% by weight, based on the total solids.
Claim 10
Dependent Claim
21 words
The process of claim 1, wherein said TDI distillation residues are mixed with said aqueous sludges in an activated sludge tank.
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) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |