Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1974-11-08
1976-06-01
Anderson, Harold D.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 78L, 260 95C, C08G 6916, C08G 6928
Patent
active
039608204
ABSTRACT:
Improved control is provided in a process for the continuous preparation of a polyamide from an aqueous solution of polyamide-forming reactants, e.g., from an aqueous solution of hexamethylene diammonium adipate. The process comprises feeding continuously, the aqueous solution of polyamide-forming reactants or partially polymerized polyamide-forming reactants to an elongated tubular zone having an inlet pressure of at least 60 lb./sq. in. absolute; passing the solution through the elongated zone and gradually reducing the pressure along the zone to progressively flash water into steam while supplying sufficient heat to maintain the temperature of the solution above the melting point of the resultant polyamide; and passing the molten polyamide from the tubular zone into a finishing vessel. The improvement comprises maintaining a substantially constant level in the finishing vessel by controlling the pressure in the tubular zone and thus regulating the flow of molten polyamide from the tubular zone by injecting steam at an intermediate point in the tubular zone.
REFERENCES:
patent: 3193535 (1965-07-01), Carter
Anderson Harold D.
Du Pont of Canada Limited
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