Recirculating reaction apparatus for continuous preparation of a

Details Recirculating reaction apparatus for continuous preparation of a Recirculating reaction apparatus for continuous preparation of a

1975-01-10

1977-04-26

Wolk, Morris O.

Chemistry: physical processes

Physical processes

Crystallization

23283, B01J 100

Patent

active

040198669

ABSTRACT:
A process and an apparatus for the continuous preparation of a polyamide from polyamide forming reactants. In the process, the reactants are injected continuously into a reaction zone designed to permit rapid heating and uniform mixing. The reactants are heated and uniformly mixed in the reaction zone to form a vapor and a prepolymer. The vapor is separated from the prepolymer and may be vented through a rectifying zone to recover diamine therefrom. The prepolymer is withdrawn from the reaction zone and may be passed to a second reaction zone for further reaction to form a polymer and more vapor which is vented to atmosphere. The apparatus includes a heat exchanger and a separator; the bottom of the separator being connected to the inlet of the heat exchanger by a recirculating loop and the outlet of the heat exchanger being connected to the separator by a nozzle. Recirculation means and means to inject salt solution into the recirculating loop are also included. The recirculating means may comprise a pump or the recirculating means and the heat exchanger may be combined in a vertical thermosyphon reboiler. Control means are included for venting vapor from the separator and a rectification column may be included after the separator to recover diamine from the vapor. A flash valve or a pump and a reactor (either a liquid vapor phase reactor or a flasher) may also be included.

REFERENCES:
patent: 2689839 (1954-09-01), Heckert
patent: 3044993 (1962-07-01), Tiemersa
patent: 3185672 (1965-05-01), Clemo et al.
patent: 3296217 (1967-01-01), Tate
patent: 3466150 (1969-09-01), Dietze et al.
patent: 3513145 (1970-05-01), Crawford
patent: 3644096 (1972-02-01), Lewis et al.
A.P.C. Application of Fauser, Ser. No. 306,071, Published Apr. 27, 1943.

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