Claims
- 1. 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.degree.-120.degree.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.
- 2. 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).
- 3. A process according to claim 1 wherein said base is sodium hydroxide.
- 4. A process according to claim 1 wherein said base is calcium hydroxide.
- 5. 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.degree.-120.degree.C by injecting steam into the stream of said preheated mixture.
- 6. A process according to claim 1 wherein said separated coagulated protein is washed with warm water.
- 7. A process according to claim 1 wherein said heating is carried out by injecting super-heated steam into the mixture.
- 8. A process according to claim 7, wherein said super-heated steam is injected into the mixture for a period of at least 2 minutes.
- 9. A process according to claim 1 wherein said separation step is carried out by centrifugation.
- 10. A process according to claim 9 wherein said heated mixture is cooled before the separation step is carried out.
Priority Claims (1)
Number |
Date |
Country |
Kind |
903/72 |
Mar 1972 |
NO |
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Parent Case Info
This application is a continuation-in-part of copending application Ser. No. 342,798, filed Mar. 19, 1973, now abandoned.
US Referenced Citations (5)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
342798 |
Mar 1973 |
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