Dispensing – With heating or cooling means – Heating only
Patent
1996-07-10
1998-06-16
Pike, Andrew C.
Dispensing
With heating or cooling means
Heating only
222367, 406 48, 406 62, 406168, 406175, G01F 1124, B65G 5346
Patent
active
057657289
ABSTRACT:
An improved system (10) conveys comminuted material from a source (12) to a vessel (14), especially for continuously conveying chopped poly(ethyleneterephthalate), or PET, into a methanolysis recovery reactor without entrainment of air into the reactor and without frequent jamming of the apparatus. A single rotary vane valve (36) is provided in the conveyance path at an inlet (38) to the vessel. The valve has clearances between the vanes (44) and the housing (48) larger than the smallest dimension of the comminuted material to prevent jamming of the rotor by PET flakes. The internal spaces (52, 47) in the valve are continuously purged with nitrogen at sufficient volume and pressure such that gases and fumes in the vessel are substantially prevented from passing upward through the valve. Nitrogen also flows from the valve countercurrently through the supply ducts (26, 30) to strip entrained air from the incoming material. Preferably, additional nitrogen is introduced into the supply duct (30) ahead of the valve to assist in air removal from the material. Internal valve surfaces (64) are heated to prevent condensation of gases and fumes from the vessel, thereby preventing sticking and clogging of the comminuted material within the valve. A slide (28) for entry of material into the valve is provided at a 40.degree. angle to assure uniform flow of material. The comminuted material is conveyed from the source by high-velocity air (17) and can be humidified (66) as needed to prevent sticking or clumping in the conveyance path.
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Knight Gerald Douglas
Quadrini Mark Louis
Simpson Brian Leigh
Tietz Richard Arthur
Bocchetti Mark G.
Eastman Kodak Company
Pike Andrew C.
Snee, III Charles E.
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