US PATENT SUBCLASS 423 / 531
.~.~.~.~ Purifying acid or reactant

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

511  DF  SULFUR OR COMPOUND THEREOF {4}
512.1  DF  .~ Oxygen containing {11}
521  DF  .~.~ Ternary compound containing hydrogen {1}
522  DF  .~.~.~ Sulfuric acid {5}
531.~.~.~.~ Purifying acid or reactant

DEFINITION

Classification: 423/531

(under subclass 522) Processes which include the removal or separation of impurities present in the reactants or in the acid.

(1) Note. For the purposes of this subclass merely concentrating or dehydrating the acid to make the ratio of H2SO4 to H2O higher is not considered purification.

SEE OR SEARCH THIS CLASS, SUBCLASS:

523, for sulfuric acid making or purifying processes which may involve a nitrogen containing impurity.

525, for sulfuric acid making or purifying processes wherein the original mixture includes an organic or carbonaceous impurity.