Method and apparatus for vacuum drying colloidal substances
AssigneeSato Iron Works Co., Ltd.
InventorTakuya Sato
Life of this patent
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Abstract
A colloidal substance is injected into a vacuum chamber to be dehydrated therein. The dehydrated substance is extracted from the vacuum chamber by a screw extruder disposed at a bottom of the vacuum chamber. A gas resulting from the dehydration is drawn from the vacuum chamber into a surface condenser to be cooled through an indirect heat exchange with cooling water. After the dehydration of the substance, the extraction of the dehydrated substance and the cooling of the gas are carried out in parallel.
Claims12
A method of vacuum drying a colloidal substance comprising the steps of:
- dehydrating said colloidal substance by subjecting the substance stored in a raw material tank of a raw material supplying device to a heat exchange with heating vapor in a heat exchanger disposed upstream a vacuum drying tower, and then injecting the substance into a vacuum chamber;
- kneading and extracting a substance dehydrated in said vacuum chamber;
- cooling a gas withdrawn from said vacuum chamber through an indirect heat exchange with a refrigerant by utilizing a surface condenser;
- discharging a gas sucked and exhausted from said vacuum chamber into the atmosphere;
- and
- carrying out said extracting step and said cooling step in parallel after said dehydrating step.
An apparatus for vacuum drying a colloidal substance comprising:
- raw material supplying means for supplying said colloidal substance;
- a vacuum drying tower for vacuum dehydrating said colloidal substance;
- suction means for exhausting a gas from said vacuum drying tower to maintain a vacuum in said vacuum drying tower;
- substance extracting means for receiving a treated substance from said vacuum drying tower, and kneading and outputting the substance;
- and
- cooling means mounted in an intermediate position of an exhaust line extending from said vacuum drying tower to said suction means to cool the gas exhausted from said vacuum drying tower;
- wherein said cooling means is a surface condenser for effecting an indirect heating exchanger;
- and
- wherein said raw material supplying means comprises a heat exchanger for heating said substance through an indirect heat exchange with heating vapor.
Dependencies are inferred from the claim text.