US5683587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating industrial wastes
Assignee: Individual
•
Filing: 1995-12-29
•
Granted: 1997-11-04
•
Expires: 2015-12-29
Abstract
Abstract Water to be utilized is reacted with soda ash and lime to produce a less corrosive and foulant water. Reaction sludges are fed to a desulfurization unit, where SO x , NO x and CO 2 abatement occurs; other industrial waste sludges and/or waters and/or gases can also be utilized in such connection. FIG. 1 is one of the possible process schemes of the present invention.
Inventors
- 👤 Marcello Ferrara
- 👤 Maria Gabriella Scopelliti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:51
CPC Classifications
C; C02; C02F; C02F5/00; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/60; B01D53/62; C02F1/00; C02F1/50; C02F1/52; C02F1/5236; C02F1/5263; C02F1/54; C02F1/66; B01D2251/00; B01D2251/40; B01D2251/402; B01D2251/404; B01D2259/00; B01D2259/80; C02F1/02; C02F1/04; C02F1/16; C02F11/00; C02F11/12; C02F2103/00; C02F2103/02; C02F2103/023; C02F2103/08; Y; Y02; Y02A; Y02A20/00; Y02A20/124; Y02A50/00; Y02A50/20; Y02C; Y02C20/00; Y02C20/40; Y10; Y10S; Y10S210/00; Y10S210/918; Y10S210/919; Y10S423/00; Y10S423/08
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
134 words
A process for treating wastes comprising the steps of: producing a waste sludge containing calcium carbonate and magnesium hydroxide by reaction of soda ash and lime with process water; feeding a hot waste gas at a temperature of from about 200° C. to 1000° C. containing 50 to 50000 ppm of pollutants selected from the group consisting of SO x , NO x and CO 2 to a scrubber apparatus containing an adsorbent slurry comprising said waste sludge for removing SO x , NO x and CO 2 ; separating the waste sludge to obtain a dry sludge; injecting the dry sludge into a reaction chamber; reacting a gaseous stream containing said pollutants in the reaction chamber with said dry sludge to substantially reduce sulfur oxide compounds and nitrogen oxides in said reaction chamber.
Claim 2
Dependent Claim
134 words
A process for treating wastes comprising the steps of: producing a waste sludge containing calcium carbonate and magnesium hydroxide by reaction of soda ash and lime with process water; feeding a hot waste gas at a temperature of from about 200° C. to 1000° C. containing 50 to 50000 ppm of pollutants selected from the group consisting of SO x , NO x and CO 2 to a scrubber apparatus containing an adsorbent slurry comprising said waste sludge for removing SO x , NO x and CO 2 ; separating the waste sludge to obtain a dry sludge; injecting the dry sludge into a reaction chamber; reacting a gaseous stream containing said pollutants in the reaction chamber with said dry sludge to substantially reduce sulfur oxide compounds and nitrogen oxides in said reaction chamber.
Claim 3
Dependent Claim
15 words
The process according to claim 1 where the waste sludge is derived from waste water.
Claim 4
Dependent Claim
13 words
The process according to claim 1 where the reaction chamber comprises a boiler.
Claim 5
Dependent Claim
19 words
The process according to claim 3 further comprising the step of adding ammonia to the pollutants in the scrubber.
Claim 6
Dependent Claim
13 words
The process according to claim 1 where the waste sludge has a pH>7.
Claim 7
Dependent Claim
29 words
The process according to claim 5 further comprising the step of adding additive compounds selected from the group consisting of corrosion inhibitors, antifouling agents, antiscaling agents, and biocide agents.
Claim 8
Dependent Claim
41 words
The process according to claim 6 where said additive compounds include Na 2 CO 3 , NaHCO 3 , Ca(OH) 2 , NaOH, Zn, water soluble organic polymers, phosphorus compounds, chromates, nitrates, silicates, molybdates, azoles, chlorinated compounds, ammonium salts and amines.
Claim 9
Dependent Claim
56 words
The process according to claim 7 further including the step of adding to the reaction chamber a sorbent compound selected from the group consisting of CaCO 3 , CaO, Ca(OH) 2 , Na 2 SO 3 , NaOH, NaCl, Na 2 CO 3 , K 2 CO 3 MgO, MgSO 4 , and Mg(OH) 2 .
Claim 10
Dependent Claim
21 words
The process according to claim 7 where the water soluble polymers are selected from the group consisting of polyacrylates and polyacrylamides.
Claim 11
Dependent Claim
40 words
The process according to claim 1 further including the step of alkalinizing the waste sludge with a compound selected from the group consisting of Na 2 CO 3 , NaHCO 3 , Ca(OH) 2 , NaOH and NH 3 .
Claim 12
Dependent Claim
25 words
The process according to claim 10 further including the step of adding lime to regenerate Na 2 SO 4 and NaOH from the waste sludge.
Claim 13
Independent Claim
114 words
A method for treating wastes comprising the steps of: producing a waste sludge containing calcium carbonate and magnesium hydroxide by reaction of soda ash and lime with process water; feeding the waste sludge to a scrubber with a waste gas mixture containing gaseous pollutants where said gaseous pollutants are in a mixture comprising 50 ppm to 50000 ppm each of SO x , NO x and CO 2 ; separating the waste sludge to obtain a dry sludge; injecting the dry sludge into a reaction chamber; reacting a gaseous stream containing said gaseous pollutants in the reaction chamber with said sludge to substantially reduce sulfur oxide compounds and nitrogen oxides in said reaction chamber.
Claim 14
Independent Claim
114 words
A method for treating wastes comprising the steps of: producing a waste sludge containing calcium carbonate and magnesium hydroxide by reaction of soda ash and lime with process water; feeding the waste sludge to a scrubber with a waste gas mixture containing gaseous pollutants where said gaseous pollutants are in a mixture comprising 50 ppm to 50000 ppm each of SO x , NO x and CO 2 ; separating the waste sludge to obtain a dry sludge; injecting the dry sludge into a reaction chamber; reacting a gaseous stream containing said gaseous pollutants in the reaction chamber with said sludge to substantially reduce sulfur oxide compounds and nitrogen oxides in said reaction chamber.
Claim 15
Dependent Claim
31 words
The method of claim 12 where the reaction chamber comprises a boiler and the waste sludge is introduced in the gaseous stream at a temperature from 200° C. to 1300° C.
Claim 16
Dependent Claim
12 words
The method of claim 12 where the waste sludge has a pH>7.
Claim 17
Dependent Claim
32 words
The method of claim 14 further comprising the step of injecting into said waste sludge additive compounds selected from the group consisting of corrosion inhibitors, antifouling agents, antiscaling agents, and biocide agents.
Claim 18
Dependent Claim
41 words
The method according to claim 15 where said additive compounds include Na 2 CO 3 , NaHCO 3 , Ca(OH) 2 , NaOH, Zn, water soluble organic polymers, phosphorus compounds, chromates, nitrates, silicates, molybdates, azoles, chlorinated compounds, ammonium salts and amines.
Claim 19
Dependent Claim
21 words
The method according to claim 16 where the water soluble polymers are selected from the group consisting of polyacrylates and polyacrylamides.
Claim 20
Dependent Claim
59 words
The method according to claim 14 further including the step of adding to the reaction chamber a sorbent compound selected from the group consisting of CaCO 3 , CaO, Ca(OH) 2 , Na 2 SO 3 , NaOH, NaCl, Na 2 CO 2 , NaCO 3 , K 2 CO 3 MgO, MgCO 2 , and Mg(OH) 2 .
Claim 21
Dependent Claim
16 words
The method according to claim 14 further comprising the step of adding ammonia into the scrubber.
References Cited (Backward Citations)
US1964487A
Cited
US2000197A
Cited
US2262301A
Cited
US3769208A
Cited
US4085194A
Cited
US3828525A
Cited
US3876537A
Cited
US4017391A
Cited
US4000991A
Cited
US4059513A
Cited
US4137163A
Cited
US4123355A
Cited
US4246245A
Cited
US4801387A
Cited
US4756888A
Cited
US4532047A
Cited
US4634533A
Cited
US4834955A
Cited
US5350511A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-11-03 | 2001-05-05 | 2001-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-11-03 | 2005-05-05 | 2005-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-11-03 | 2009-05-05 | 2009-11-04 | $7700.00 | Window Closed / Lapsed |