US4301014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphorus pentasulfide waste water treatment
Assignee: Occidental Chemical Corp
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Filing: 1980-06-05
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Granted: 1981-11-17
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Expires: 2000-06-05
Abstract
Abstract The process disclosed in this invention takes the waste solids, gases, and water from a phosphorus pentasulfide manufacturing facility and hydrolyzes the phosphorus pentasulfide by heating. The phosphorus portion is converted to a soluble phosphate and the sulfur portion to a mixture of sulfide, sulfite and sulfate. The soluble fraction is then treated with a calcium hydroxide solution precipitating the phosphate and sulfates which are removed. The gaseous portion of the hydrolysis is fed to a catalytic oxidizer which converts the sulfides to sulfur, which is removed and the gas, free of sulfur containing species, is exhausted to the atmosphere. The filtrate from the precipitation reaction can be recycled to the plant, or may be chlorinated and discharged.
Inventors
- 👤 Harry E. Buckholtz
- 👤 Joseph J. Moritz
- 👤 Joseph S. Wisnouskas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:29
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8603; B01D53/8606; C; C02; C02F; C02F1/00; C02F1/52; C02F1/5236; C02F9/00; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/906
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
136 words
A process for the treatment of waste water resulting from the manufacture, use or storage of phosphorus pentasulfide comprising: a. collecting the waste water, b. hydrolyzing the P 4 S 10 to phosphates, sulfides, sulfites and sulfates, c. filtering the hydrolysis mixture to remove any unreacted P 4 S 10 , returning the insolubles for further hydrolysis, d. treating the soluble portion of the hydrolysis step with a solution of cation that will react with the soluble phosphate anion to precipitate, e. removing the precipitate from the mixture, f. oxidizing the filtrate, adjusting the pH, filtering to remove any solids to allow discharge to the environment. g. passing the gaseous output of the hydrolysis step b. into a catalytic scrubber to remove the sulfur, and h. venting the gaseous output from the scrubber to the atmosphere.
Claim 2
Dependent Claim
136 words
A process for the treatment of waste water resulting from the manufacture, use or storage of phosphorus pentasulfide comprising: a. collecting the waste water, b. hydrolyzing the P 4 S 10 to phosphates, sulfides, sulfites and sulfates, c. filtering the hydrolysis mixture to remove any unreacted P 4 S 10 , returning the insolubles for further hydrolysis, d. treating the soluble portion of the hydrolysis step with a solution of cation that will react with the soluble phosphate anion to precipitate, e. removing the precipitate from the mixture, f. oxidizing the filtrate, adjusting the pH, filtering to remove any solids to allow discharge to the environment. g. passing the gaseous output of the hydrolysis step b. into a catalytic scrubber to remove the sulfur, and h. venting the gaseous output from the scrubber to the atmosphere.
Claim 3
Dependent Claim
25 words
The process of claim 1, wherein gaseous fumes from the manufacturing facility are combined with the gaseous output of the hydrolysis step b. for treatment.
Claim 4
Dependent Claim
24 words
The process of claim 1, wherein the temperature of the hydrolysis step is maintained within the range of about 25° to about 100° C.
Claim 5
Dependent Claim
24 words
The process of claim 1, wherein the temperature of the hydrolysis step is maintained within the range of about 50° to about 60° C.
Claim 6
Dependent Claim
19 words
The process of claim 4, wherein hydrolysis is conducted for a period of about 3 to about 6 hours.
Claim 7
Dependent Claim
24 words
The process of claim 1, wherein the precipitate of step (d) is reacted with an oxidizing agent to reduce the COD of the precipitate.
Claim 8
Dependent Claim
24 words
The process of claim 6, wherein the oxidizing agent is selected from a group containing calcium hypochlorite, sodium hypochlorite, hydrogen peroxide, ozone, or chlorine.
Claim 9
Dependent Claim
30 words
The process of claim 1, wherein the cation solution is selected from the group consisting of calcium hydroxide, hydrated aluminum sulfate, sodium aluminate, ferrous sulfate, ferric sulfate or magnesium hydroxide.
Claim 10
Dependent Claim
12 words
The process of claim 8, wherein the cation solution is calcium hydroxide.
Claim 11
Dependent Claim
28 words
The process of claim 1 wherein the oxidizer used in step (f) is selected from the group consisting of chlorine, hydrogen peroxide, ozone, calcium hypochlorite or sodium hypochlorite.
Claim 12
Dependent Claim
14 words
The process of claim 10 wherein the oxidizer used in step (f) is chlorine.
Claim 13
Dependent Claim
140 words
A process for the preparation of essentially phosphate free water from waste water resulting from the manufacture, use or storage of phosphorus pentasulfide comprising: a. collecting the waste water, b. hydrolyzing the P 4 S 10 to phosphates, sulfides, and sulfates, c. filtering the hydrolysis mixture to remove any unreacted P 4 S 10 , returning the insoluble portion for further hydrolysis, d. treating the soluble portion of the hydrolysis step with a solution of cation that will react with the soluble phosphate anion to precipitate. e. removing the precipitate from the mixture, f. oxidizing the filtrate, adjusting the pH, filtering to remove any solids to allow discharge to the environment, g. passing the gaseous output of hydrolysis step b. into a catalytic scrubber to remove the sulfur, and h. venting the gaseous output from the scrubber to the atmosphere.
Claim 14
Dependent Claim
140 words
A process for the preparation of essentially phosphate free water from waste water resulting from the manufacture, use or storage of phosphorus pentasulfide comprising: a. collecting the waste water, b. hydrolyzing the P 4 S 10 to phosphates, sulfides, and sulfates, c. filtering the hydrolysis mixture to remove any unreacted P 4 S 10 , returning the insoluble portion for further hydrolysis, d. treating the soluble portion of the hydrolysis step with a solution of cation that will react with the soluble phosphate anion to precipitate. e. removing the precipitate from the mixture, f. oxidizing the filtrate, adjusting the pH, filtering to remove any solids to allow discharge to the environment, g. passing the gaseous output of hydrolysis step b. into a catalytic scrubber to remove the sulfur, and h. venting the gaseous output from the scrubber to the atmosphere.
Claim 15
Dependent Claim
24 words
The process of claim 12, wherein the temperature of the hydrolysis step is maintained within the range of about 25° to about 100° C.
Claim 16
Dependent Claim
24 words
The process of claim 12, wherein the temperature of the hydrolysis step is maintained within the range of about 50° to about 60° C.
Claim 17
Dependent Claim
19 words
The process of claim 14, wherein hydrolysis is conducted for a period of about 3 to about 6 hours.
Claim 18
Dependent Claim
30 words
The process of claim 12 wherein the cation solution is selected from the group consisting of calcium hydroxide, hydrated aluminum sulfate, sodium aluminate, ferrous sulfate, ferric sulfate or magnesium hydroxide.
Claim 19
Dependent Claim
12 words
The process of claim 16, wherein the cation solution is calcium hydroxide.
Claim 20
Dependent Claim
27 words
The process of claim 12, wherein the oxidizer of step (f) is selected from the group consisting of chlorine, hydrogen peroxide, ozone, calcium hypochlorite or sodium hypochlorite.
Claim 21
Dependent Claim
13 words
The process of claim 12, wherein the oxidizer of step (f) is chlorine.
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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) | 1984-11-16 | 1985-05-18 | 1985-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-16 | 1989-05-18 | 1989-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-16 | 1993-05-18 | 1993-11-17 | $7700.00 | Window Closed / Lapsed |