Method for collecting reversely subliming substance and apparatus therefor
AssigneeNippon Shokubai Co., Ltd.
InventorsTsukasa Takahashi, Shigetaka Takamiya, Kenji Nakahara
Life of this patent
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Abstract
A reversely subliming substance is efficiently collected on a commercial scale from a gas containing the substance. This is achieved by introducing the gas containing the substance into a shell-and-tube collecting apparatus by controlling the resistance offered to the gas during the passage thereof through the cooled tubes retained inside the collecting apparatus or by utilizing gas-introducing tubes excelling in dispersibility.
Claims19
A method for collecting a reversely subliming substance from a gas containing the substance, comprising:
- preparing a shell-and-tube collecting apparatus capable of performing adhesion and collection of the substance on the inside surfaces of cooled collection tubes, the collection tubes being fixed with tube sheets to the apparatus so as to arrange in parallel with in the apparatus;
- adjusting a pressure loss to be in the range of 0.05 to 50,000 Pa for the gas passing through the collection tubes;
- and
- introducing the gas into said apparatus.
A method for collecting a reversely subliming substance from a gas containing the substance, comprising:
- preparing a shell-and-tube collecting apparatus capable of performing adhesion and collection of the substance on the inside surfaces of cooled collection tubes, the collection tubes being fixed with tube sheets to the apparatus so as to arrange in parallel with in the apparatus;
- arranging an empty space under the lower part of cooled collection tubes;
- introducing the gas into the empty space by adopting at least one of the following mechanisms:
- (1) a gas-introducing tube the outlet direction of which has an angle larger than 90° relative to the directions in which the gas passes through the collection tubes, and
- (2) two or more gas-introducing tubes;
- and
- contacting the gas with the inside surfaces of the cooled collection tubes to perform adhesion and collection of the reversely subliming substance.
A shell-and-tube collecting apparatus capable of adhering and collecting a reversely subliming substance from a gas containing the substance, comprising:
- a plurality of collection tubes disposed in the apparatus by the tube sheets, each collection tube having an inside surface for collecting and adhering the reversely subliming substance from the gas flow and having an outside surface which is cooled by a refrigerant;
- and
- baffle plates disposed on the outlet parts of said collection tubes for controlling a pressure loss of the gas passing through said collection tubes.
A method for collecting a reversely subliming substance from a gas containing the substance, comprising:
- preparing a shell-and-tube collecting apparatus capable of performing adhesion and collection of the substance on the inside surfaces of cooled collection tubes, the collection tubes being fixed with tube sheets to the apparatus so as to arrange in parallel with in the apparatus;
- arranging an empty space under the lower part of cooled collection tubes;
- introducing the gas into the empty space by adopting a gas-introducing tube with a perforated plate at the outlet part thereof and at least one of the following mechanisms:
- (1) a gas-introducing tube the outlet direction of which has an angle larger than 90° relative to the directions in which the gas passes through the collection tubes, and
- (2) two or more gas-introducing tubes;
- and
- contacting the gas with the inside surfaces of the cooled collection tubes to perform adhesion and collection of the reversely subliming substance.
Dependencies are inferred from the claim text.