Continuous process for the production of maeamic acids

Details Continuous process for the production of maeamic acids Continuous process for the production of maeamic acids

1975-04-24

1977-08-16

Thomas, Jr., James O.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260389, 260514K, 260308R, 260534R, C07C 5100

Patent

active

040426203

ABSTRACT:
A continuous process is provided for the preparation of a maleamic acid of the formula: ##STR1## in which: R represents a linear or branched alkylene, arylene, aralkylene, alkylarylene or cycloalkylene radical or a divalent heterocyclic radical, the free valencies of which are attached to carbon atoms, the radical containing 2 to 20 carbon atoms and X represents either a hydrogen atom or the radical: ##STR2## which comprises passing a solution of a primary monoamine or diamine and a solution of maleic anhydride in amounts such that there is a 5 to 20 mol % excess of anhydride, at a temperature of from 40.degree. to 130.degree. C and at a rate greater than 7 m/second through an injection nozzle into a twin screw reactor, the solvent for the primary amine being the same as, or compatible with, the solvent for the maleic anhydride. This process eliminates clogging problems.

REFERENCES:
patent: 2459964 (1949-01-01), Robinson et al.
patent: 2723991 (1955-11-01), Sears et al.
patent: 2793231 (1957-05-01), Newby et al.
patent: 3947493 (1976-03-01), Balma et al.

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