GB932576A - Drying apparatus and method - Google Patents
Drying apparatus and methodInfo
- Publication number
- GB932576A GB932576A GB1392261A GB1392261A GB932576A GB 932576 A GB932576 A GB 932576A GB 1392261 A GB1392261 A GB 1392261A GB 1392261 A GB1392261 A GB 1392261A GB 932576 A GB932576 A GB 932576A
- Authority
- GB
- United Kingdom
- Prior art keywords
- liquid
- water
- chamber
- ice
- tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
- F26B5/06—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum the process involving freezing
Landscapes
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Molecular Biology (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
932,576. Drying systems and apparatus. PILLISBURY CO. April 18, 1961 [April 29, 1960], No. 13922/61. Class 34 (2). Apparatus and method for the low temperature drying of moisture containing material comprises subjecting the material to a zone of reduced pressure, lowering the temperature of the material by evaporation of moisture therein under the effects of the reduced pressure, distributing a refrigerated liquid condensing agent around the periphery of the zone and cascading the condensing agent over surfaces in close proximity to the material to be dried, adsorbing moisture vapour freed from the material in the cascading condensing agent, withdrawing the agent and adsorbed moisture from the zone of reduced pressure, separating the adsorbed moisture from the agent, recirculating the agent for redistribution to the reduced pressure zone and recooling the recirculated agent just prior to introduction to the zone. Material to be dried is frozen either prior to insertion on trays into a chamber 10 or by the action of vaporizing the water content therein under vacuum conditions within the chamber, which conditions are achieved by a pump (not shown) and a conduit 15. The trays are positioned on hollow shelves 12 through which a heating medium passes from an inlet 13 to vaporize any water remaining on the material, the water vapour so produced being removed by a refrigerated adsorbtion liquid which is introduced into the chamber via a cooler unit 20 and conduit 19, through a distributer tube 17 having apertures 18 for cascading down condensing panels 16 attached to the walls of the chamber. The water vapour is immediately condensed by solution in the adsorbtion liquid when a water miscible condensing agent is used or is condensed as ice crystals when a water immiscible liquid is used. The mixture of liquid and condensed vapour is drawn off through a sump 23 and pumped to a separated means which varies according to the adsorbtion liquid utilised. With a water miscible liquid e.g. a brine of lithium bromide or lithium chloride, the mixture is heated as it passes through a heat exchanger 27 in countercurrent flow with reconcentrated brine being returned from an evaporator 30 for reintroduction to the drying chamber through the conduit 19 and cooler unit 20. The temperature of the liquid is further raised in the evaporator by a heating coil 29 so as to evaporate and expel water vapour therefrom and so reconcentrate the brine. The flow of adsorbtion liquid into the chamber is controlled by a valve 34 operated by a motor 35 actuated by a unit 36 responsive to the level of the mixture in an outlet conduit 24 below the sump 23. In a modifiation, Fig. 2 (not shown), a refrigerated water immiscible liquid condensing liquid having a density less than water or ice e.g. polydimethyl siloxane fluid is utilized so that the water vapour produced in the drying chamber is condensed as ice crystals and is entrained in the cascading fluid. The fluid and crystals enter a vertical settling tank wherein the heavier crystals sink to the bottom are there heated by a coil and so discharged and the reconcentrated fluid is separated and recirculated through the cooler unit to the chamber. In another modification, Fig. 3 (not shown), a refrigerated water immiscible liquid is utilized having a density between those of ice and water, the ice and fluid being separated in a first vertical separator tank from which both the ice free fluid is withdrawn for recirculation from the base and also the ice crystals are withdrawn from the top of the tank together with a portion of the liquid to a second tank where the crystals arc melted, the fluid rising to the top of the tank for separation and recirculation. In a further modification, Fig. 4 (not shown), a refrigerated water immiscible liquid is utilized having a density greater than those of either ice and water. The liquid and crystals pass from the chamber into a vertical separator tank wherein the heavier liquid sinks to the bottom of the tank and is withdrawn therefrom for recirculation, the ice crystals being melted at the top of the tank to faciliate discharge.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US2564060A | 1960-04-29 | 1960-04-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB932576A true GB932576A (en) | 1963-07-31 |
Family
ID=21827237
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1392261A Expired GB932576A (en) | 1960-04-29 | 1961-04-18 | Drying apparatus and method |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB932576A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3253350A (en) * | 1963-10-02 | 1966-05-31 | Niagara Blower Co | Apparatus for condensing water vapor under low absolute pressure at a temperature less than the freezing point of water |
CN100455963C (en) * | 2006-04-18 | 2009-01-28 | 沈阳大学 | Method for fast freezing liquid material used for freezing drying technique |
RU2776402C1 (en) * | 2021-02-10 | 2022-07-19 | Сергей Анатольевич Ермаков | Vacuum freeze drying unit |
-
1961
- 1961-04-18 GB GB1392261A patent/GB932576A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3253350A (en) * | 1963-10-02 | 1966-05-31 | Niagara Blower Co | Apparatus for condensing water vapor under low absolute pressure at a temperature less than the freezing point of water |
CN100455963C (en) * | 2006-04-18 | 2009-01-28 | 沈阳大学 | Method for fast freezing liquid material used for freezing drying technique |
RU2776402C1 (en) * | 2021-02-10 | 2022-07-19 | Сергей Анатольевич Ермаков | Vacuum freeze drying unit |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3341429A (en) | Fluid recovery system with improved entrainment loss prevention means | |
US2225959A (en) | Process for dehydrating natural gas | |
US3725209A (en) | Centrifugal distillation system | |
US3589984A (en) | Apparatus for dehydrating organic liquids | |
US2345548A (en) | Method and apparatus for desiccating sera, biologicals, and other materials | |
US2625505A (en) | Method and apparatus for recovering volatile flavoring material | |
US3269136A (en) | Apparatus for separation of solvent from solute by freezing | |
US4545134A (en) | Dual vessel heat exchange systems | |
US3478531A (en) | Saline water conversion system | |
US3250081A (en) | Process for freezing water from solutions to make fresh water or concentrated solutions | |
CA1227709A (en) | Dual vessel heat exchange systems | |
US3311991A (en) | Drying apparatus and method | |
US3132929A (en) | Apparatus for freeze drying | |
US3314881A (en) | Water extraction by freezing | |
US2126467A (en) | Distillation process | |
US3109870A (en) | Extraction method for separating at least one component of a phase consisting of a mixture of a substances | |
US3137554A (en) | Purification by crystallization with a volatile refrigerant | |
GB932576A (en) | Drying apparatus and method | |
US2570213A (en) | Milk evaporation process and apparatus | |
US2862819A (en) | Apparatus for and method of removing impurities from highly volatile gas | |
US3248890A (en) | Process to concentrate sulphite-lye or other liquors by freezing | |
US3240024A (en) | Freeze crystallization separation systems | |
GB845733A (en) | Improvements in or relating to evaporators | |
US2402401A (en) | Method and apparatus for dehydrating in the frozen state | |
US1317688A (en) | Balanced process of extracting and desiccating sulfur dioxid from |