US PATENT SUBCLASS 562 / 413
.~.~.~.~.~.~.~ Multistage

Current as of: June, 1999
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562 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {41}
400  DF  .~ Carboxylic acids and salts thereof {14}
405  DF  .~.~ Aromatic {13}
407  DF  .~.~.~ Formation of carboxyl group by oxidation {1}
408  DF  .~.~.~.~ Of aromatic compound {3}
409  DF  .~.~.~.~.~ Alkyl side chain oxidized {3}
412  DF  .~.~.~.~.~.~ Air, oxygen, or ozone oxidant {5}
413.~.~.~.~.~.~.~ Multistage

DEFINITION

Classification: 562/413

Multistage:

(under subclass 412) Processes wherein the oxidation is carried out in plural sequential stages.

(1) Note. These processes include the use of multiple reactors where the product of oxidation in a first reactor is passed to a second reactor and further oxidized or may be carried out in a single reactor where the conditions for a second stage of oxidation are changed.