Appeal No. 96-1188
Application No. 08/240,800
hydrogen sulfide from the reactor, (3) forming bisulfite in
the solution by absorbing additional sulfur dioxide after
removal of the hydrogen sulfide gas, and (4) removing the
aqueous bisulfite-containing solution from the reactor.
Although Talonen discloses at column 4 that bisulfite and
hydrogen sulfide are products of some of the reactions that
occur during the introduction of sulfur dioxide into a sulfide
solution, neither Talonen nor any of the other cited
references provides a teaching of the sequence of steps
defined by the process presently on appeal. Canada '378
discloses a process for inhibiting the emission of hydrogen
sulfide during the absorption of sulfur dioxide in a sulfide
solution and fails to teach the generation of bisulfite.
Talonen, in the paragraph bridging columns 4 and 5, teaches
that bisulfite is first produced when sulphur dioxide is
introduced into a sulphide solution and, then, after a certain
amount of sulphur dioxide is absorbed by the sodium sulphide,
plenty of hydrogen sulphide is released from the solution.
Also, Talonen does not disclose removing bisulfite as a
product but, rather, elemental sulfur is the product of the
Talonen process.
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