Patent US3936375A successfully refreshed from Google Patents.
US3936375A
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Process for dewatering a proteinaceous, aqueous sludge and for removing and recovering precipitating agents from a precipitate containing proteinaceous substances
Assignee: Apothekernes Laboratorium AS
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Filing: 1974-09-25
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Granted: 1976-02-03
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Expires: 1994-09-25
Abstract
Abstract A proteinaceous aqueous sludge, previously precipitated with a precipitating agent, is mixed with calcium chloride, and treated with a base selected from the group consisting of alkali metal hydroxides and alkaline earth metal hydroxides to adjust the pH to a value in the range of 6.5-9.5. The mixture is then heated to a temperature in the range of 60°-120°C. to coagulate and agglomerate the sludge, which is then separated from the aqueous phase containing the precipitating agent.
Inventors
- 👤 Per Nettli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:27
CPC Classifications
A; A23; A23J; A23J1/00; A23J1/001; A23J1/002; C; C02; C02F; C02F11/00; C02F11/12; C02F1/00; C02F1/52; C02F1/5236; C02F1/5263; C02F11/13; Y; Y10; Y10S; Y10S530/00; Y10S530/859
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
121 words
A process for coagulating and agglomerating a proteinaceous aqueous sludge, previously precipitated with a precipitating agent, separating said sludge from the water therein contained, and recovering the precipitating agent comprising the sequential steps of; a. mixing said sludge with, calcium chloride b. adjusting the pH to a value in the range of 6.5-9.5 by adding a base selected from the group consisting of alkali metal hydroxides and alkaline earth metal hydroxides, c. heating said mixture to a temperature in the range of 60°-120°C in order to coagulate and agglomerate said sludge, whereby an aqueous phase containing the precipitating agent and a coagulated protein phase are formed, and d. separating said aqueous phase containing the precipitating agent from said coagulated protein phase.
Claim 2
Dependent Claim
121 words
A process for coagulating and agglomerating a proteinaceous aqueous sludge, previously precipitated with a precipitating agent, separating said sludge from the water therein contained, and recovering the precipitating agent comprising the sequential steps of; a. mixing said sludge with, calcium chloride b. adjusting the pH to a value in the range of 6.5-9.5 by adding a base selected from the group consisting of alkali metal hydroxides and alkaline earth metal hydroxides, c. heating said mixture to a temperature in the range of 60°-120°C in order to coagulate and agglomerate said sludge, whereby an aqueous phase containing the precipitating agent and a coagulated protein phase are formed, and d. separating said aqueous phase containing the precipitating agent from said coagulated protein phase.
Claim 3
Dependent Claim
31 words
A process according to claim 1 wherein a heat coagulable protein selected from the group consisting of blood, comminuted meat and albumin also is added to the mixture in step (a).
Claim 4
Dependent Claim
12 words
A process according to claim 1 wherein said base is sodium hydroxide.
Claim 5
Dependent Claim
12 words
A process according to claim 1 wherein said base is calcium hydroxide.
Claim 6
Dependent Claim
64 words
A process according to claim 1 wherein said heating step (c) is carried out in two stages, by first preheating said mixture with agitation until the proteinaceous material begins to coagulate, and then forming a continuous stream of said precipitated mixture and heating the mixture rapidly to a temperature in the range of 60°-120°C by injecting steam into the stream of said preheated mixture.
Claim 7
Dependent Claim
16 words
A process according to claim 1 wherein said separated coagulated protein is washed with warm water.
Claim 8
Dependent Claim
19 words
A process according to claim 1 wherein said heating is carried out by injecting super-heated steam into the mixture.
Claim 9
Dependent Claim
23 words
A process according to claim 7, wherein said super-heated steam is injected into the mixture for a period of at least 2 minutes.
Claim 10
Dependent Claim
15 words
A process according to claim 1 wherein said separation step is carried out by centrifugation.
Claim 11
Dependent Claim
19 words
A process according to claim 9 wherein said heated mixture is cooled before the separation step is carried out.
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) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |