摘要:
Freeze drying apparatus and associated lyophilization procedures are provided employing vapor flow detection and/or vacuum control for monitoring and control of the lyophilization process. The vapor flow detector, such as a windmill sensor, is disposed to monitor vapor flow from product undergoing lyophilization. In a batch process, vapor flow is collectively monitored with the vapor flow detector between the process chamber and condenser chamber, while in a manifold configuration separate vapor flow detectors are employed at each flask attachment port. A windmill sensor provides visual feedback to an operator and/or electronic feedback to a system controller. A vacuum control system is also provided for use with or independent of vapor flow detection. This vacuum control disconnects the vacuum source from the process chamber when pressure within the process chamber falls below a first predefined set point. The vacuum source is then reconnected if process chamber pressure rises above a second predefined set point.
摘要:
A cake resistance measuring system and method are used to measure the cake resistance of a freeze dried sample during or after processing, with the results of the measurement being used to improve that processing and/or subsequent freeze drying processes or formulations.
摘要:
An evaporating system for evaporating solvents from chemical samples held in supply plates, which accelerate evaporation by warming the samples in a hot air bath. The system includes adapters to allow the use of supply plates of varying heights, such as either standard micro-plates or deep well micro-plates.
摘要:
A process for lyophilizing a solution of an active agent in a delivery container is provided. Solution of active agent is deposited into a delivery container, the container is covered with a covering plate and placed inside a lyophilizing apparatus. Lyophilization is conducted to dryness by radiation, convection or both. Also provided is a device made by this process, an active agent-plastic administration device such as a syringe containing an active agent in the form of lyophilized cake, and an array of such administration devices.
摘要:
A method and an apparatus for effecting freeze-drying specimens containing solvents or condensing solvents having a shallow pan treatment chamber with little or no obstructions, holes or orifices. The treatment is effected by cooling the base of the chamber by using coolant-containing coils mounted beneath the base of the chamber. The direct thermal conduction of heat through the base of the chamber provides a more effective method of both cooling specimens and condensing solvents, typically water. A source of vacuum is provided to the chamber by a conduit located in the cover, sidewalls or base of the chamber. The method and apparatus may employ a moveable specimen holder positioned in the chamber. The moveable specimen holder may be mounted on a perforated tube which slidably engages a conduit in the base of the chamber. The perforated tube may a conduit to the source of vacuum. The specimen holder may be supported by the perforated tube and by a rigid metal wire which is used to elevate the specimen holder above the base of the chamber. By varying the elevation of the specimen holder various treatments can be effected. The method and apparatus are applicable to manifold type freeze-drying and can be used simply as a cold trap.
摘要:
A clothes dryer vent system is designed for hollow walls framed with scantling and covered with sheathing secured to the scantling, the walls having a hollow interior space that is uniformly, at least about 3½ inches wide. The vent system includes a rough-in box for recessed mounting within a hollow wall, the rough-in box having a substantially planar rear panel, side panels and nonparallel top and bottom panels, the side panels and the top and bottom panels intersecting and unitary with the rear panel, each side panel intersecting and unitary with both top and bottom panels, the rough-in box also having a depth no greater than about 4 inches, and a stub connector pipe affixed within the top panel, the stub connector pipe having a lower portion of oval-shaped cross section within the box that is couplable to a flexible dryer vent hose and an upper portion outside the box directly couplable to an oblong vent pipe having a minor cross-sectional dimension no greater than about 2 inches. The vent system also includes at least one section of 2-inch×7-inch oblong vent pipe interconnected between the rough-in box and an exterior vent.
摘要:
A process is provided for freeze-drying medicaments and foodstuffs comprising dissolving the foodstuffs or medicaments in a solvent, introducing the solution formed into a shell comprising a desiccating chamber of a shell-tube freeze-drying device to cause the solution to freeze in a tubular layer, and crushing and comminuting the freeze-dried liquid with a comminuting device to obtain a powder product.
摘要:
The present invention provides methods and apparatus for freeze drying in which a solution, which can be a radioactive salt dissolved within an acid, is frozen into a solid on vertical plates provided within a freeze drying chamber. The solid is sublimated into vapor and condensed in a cold condenser positioned above the freeze drying chamber and connected thereto by a conduit. The vertical positioning of the cold condenser relative to the freeze dryer helps to help prevent substances such as radioactive materials separated from the solution from contaminating the cold condenser. Additionally, the system can be charged with an inert gas to produce a down rush of gas into the freeze drying chamber to also help prevent such substances from contaminating the cold condenser.
摘要:
This invention is concerned with a distributive ejection apparatus for liquid material in a freeze-drying apparatus for foodstuffs, medicaments, etc., wherein the liquid material adjusted from the starting material for foodstuffs, medicaments, etc. is caused to freeze onto the inner wall surface of the upright cylindrical tube, and the distributive ejection of the liquid material onto the tube at the time of its freeze-drying by sublimation of the moisture content in the material under the vacuum condition may be done in the state of supplying the liquid material over the entire surface of the inner wall surface of the tube with a substantially uniform thickness. A cylindrical wall a protruding upwardly of the jacket 2 for circulation of heat medium, provided on the outer periphery of the tube 1, is disposed on the upper end side of the upright cylindrical tube equipped on a freeze-drying apparatus w, in the form of extending the peripheral wall of the tube 1; then, onto this inner wall surface of this cylindrical wall, the liquid material is ejected from the distributive ejection nozzles 70 equipped on the downstream side of the tube passageway 5 for feeding the liquid material is sputtered, and the thus ejected liquid material is rendered uniform in the circumferential direction on and along the inner wall surface of the cylindrical wall a, and, while it flows down, in this state, on the inner surface of the cylindrical wall a, it is made to flow onto the inner wall surface 1a of the tube 1 which constitutes the freezing surface of the liquid material.
摘要:
The invention relates to a lyophilization method which comprises the following steps: reducing the pressure in the drying chamber until the onset of a visible crystallization of the solvent at a temperature in the drying chamber which is above the solidification point of the preparation; reducing the temperature in the drying chamber to a temperature which is below the solidification point of the preparation or is identical to it, until completion of the crystallization of the solvent, resulting in a frozen solvent; and sublimation of the frozen solvent by means of reduced pressure.