Method and apparatus for reclaiming effluent from a freeze-drying process, and uses for effluent

• US 6,935,049 B2
• Filed: 12/24/2003
• Issued: 08/30/2005
• Est. Priority Date: 12/24/2003
• Status: Active Grant

• Current Assignee: Edward K. Alstat
• Original Assignee: Edward K. Alstat
• Inventors: Alstat, Edward K.
• Primary Examiner(s): GRAVINI, STEPHEN MICHAEL
• Application Number:
  US10/746,475
• Publication Number:
  US 20050144804A1
• Time in Patent Office: 615 Days
• Field of Search: 342/88, 342/93, 343/05, 344/02, 344/06, 34/92, 62/74, 159/4.09
• US Class Current: 34/288
• CPC Class Codes: C02F 1/22 by freezing
• CPC Class Codes: F26B 5/06 the process involving freezing

Abstract

A system for reclaiming effluent from a freeze drying process has at least one condenser apparatus used during a freeze-drying cycle to collect effluent from material being freeze-dried, and a recovery reservoir positioned for collecting material from the condenser apparatus. The system is characterized in that ice crystals formed from the effluent are removed from the condenser after the freeze drying cycle into recovery reservoir to be re-used. Product systems include both freeze-dried material and the effluent collected during freeze drying.

Claims

1. A system for reclaiming and reusing effluent from a freeze drying process, comprising:

at least one condenser apparatus used during a freeze-drying cycle to collect effluent from material being freeze-died; and

a recovery reservoir positioned for collecting material from the condenser apparatus;

characterized in that ice crystals formed from the effluent are removed from the condenser after the freeze drying cycle into the recovery reservoir and the resulting effluent from the ice crystals is filtered and re-used.

2. The system of claim 1 wherein there are two recovery tanks and two condensers arrayed as selectable pairs, the pairs alternately selectable for effluent reclamation.

3. The system of claim 1 further comprising a heating mechanism for heating the condenser to facilitate collection of the effluent from the condenser.

4. The system of claim 2 wherein each condenser comprises a heating mechanism to facilitate collection of the effluent from the condenser.

5. The system of claim 3 wherein the at least one condenser refrigeration and heating unit has access to two transfer mediums, one for super cooling the condenser, and another for supplying heat to the condenser.

6. The system of claim 5 wherein the transfer mediums include Liquid Nitrogen, an Ammonia solution, or Freons for cooling and Propylene, Lexol, Glycol, or Glycerin for heating.

7. The system of claim 4 wherein the condenser refrigeration and heating units have access to two transfer mediums, one for cooling and one for heating, the mediums including Liquid Nitrogen, an Ammonia solution for cooling and Propylene, Lexol, Glycol, or Glycerin for heating.

8. The system of claim 1 wherein the at least one recovery tank has a secondary vessel connected thereto for storing effluent, the vessel insulated against freezing during the freeze drying process.

9. The system of claim 3 wherein the heating mechanism is a steam generator plumbed to the condenser.

10. The system of claim 9 further including a compression filter for separating water from other components for steam generation.

11. The system of claim 9 characterized in that the ice crystals representing effluent drawn from a product being dried are collected on a selected condenser at the end of the freeze dry run and are heated by the steam generator via steam injection causing the ice to melt off into the associated recovery tank wherein it is pumped out of the tank.

12. A method for reclaiming effluent from a freeze-dry system and converting the effluent into a useable product comprising steps of:

(a) providing at least one water recovery tank under at least one condenser unit of the system;

(b) condensing vapor drawn from a product being dried in the system onto the condenser in the from of ice; and

(c) collecting and melting the ice from the condenser after a freeze drying cycle;

wherein the resulting effluent is filtered and re-used.

13. The method of claim 12 wherein in step (a) there are two recovery tanks and two condensers arrayed as selectable pairs, the pairs alternately selectable for water reclamation from a control station.

14. The method of claim 12 wherein in step (c) collecting is facilitated by a heating mechanism used to heat the condenser.

15. The method of claim 14 wherein there are two heating mechanisms, one unit for each condenser.

16. The method of claim 14 wherein the condenser has access to two transfer mediums, one for super cooling the condenser, and another for supplying heat to the condenser.

17. The method of claim 16 wherein the transfer mediums include Liquid Nitrogen, an Ammonia solution, or Freons for cooling and Propylene, Lexol, Glycol, or Glycerin for heating.

18. The method of claim 12 wherein in step (a) the at least one recovery tank has a secondary vessel connected thereto for storing effluent, the vessel insulated against freezing.

19. The method of claim 14 wherein in step (c) heating is performed by a heat source delivery mechanism in the form of a steam generator plumbed to the at least one condenser.

20. The method of claim 19 further including a compression filter for separating water from other components for steam generation.

21. A freeze dried product system, comprising:

a freeze-dried material in one container, the material lacking effluent water removed in the freeze drying process; and

the effluent in a second container, the effluent collected from the material in the first container during the freeze-drying process and filtered and reused.