US PATENT SUBCLASS 423 / 361
.~.~.~ Utilizing plurality of catalyst beds or portions

Current as of: June, 1999
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423 /   HD   CHEMISTRY OF INORGANIC COMPOUNDS

351  DF  NITROGEN OR COMPOUND THEREOF (EXCEPT AMMONIUM SALT OF NON-NITROGEN ACID) {5}
352  DF  .~ Ammonia or ammonium hydroxide {6}
359  DF  .~.~ From elemental hydrogen and nitrogen {3}
361.~.~.~ Utilizing plurality of catalyst beds or portions

DEFINITION

Classification: 423/361

(under subclass 359) Processes which include the use of more than a single catalyst bed, or in which different portions of a single catalyst bed are subjected to different processing conditions, e.g., temperature, pressure, composition of reactant mixture, etc.