Drying and gas or vapor contact with solids – Apparatus – With fluid current conveying of treated material
Patent
1993-08-11
1997-01-07
Bennett, Henry A.
Drying and gas or vapor contact with solids
Apparatus
With fluid current conveying of treated material
34580, 34586, 34590, F26B 1700
Patent
active
055904793
ABSTRACT:
In a procedure for continuously crystallizing and polymerizing polyester and polyamide materials, amorphous material is first precrystallized, preferably in a fluidized bed (1,2), then heated up to the reaction temperature in a preheating zone (4) and finally polymerized and largely liberated from byproducts in a reactor (3). In this procedure, material from the discharge area of the preheating zone (4), of the reactor (3) or of a cooler (8) is subjected to an optical analysis in an analyzing unit whereby the degree of polymerization of the material and/or the contents of byproducts can be determined. The result of the analysis as actual value is compared in an comparator unit with a predetermined nominal value obtained in at least one calibration procedure for forming at least one controlled value serving to form at least one control signal that can be supplied to at least one final control element.
REFERENCES:
patent: 5090134 (1992-02-01), Russemeyer et al.
patent: 5119570 (1992-06-01), Russemeyer et al.
patent: 5279046 (1994-01-01), Vincent
Culbert Brent A.
Ruf Arthur
Trenka Eszter
Bennett Henry A.
Buhler AG
Farber Martin A.
Ohri Siddharth
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