Patent
1977-12-29
1980-08-05
Nozick, Bernard
55 70, G03D 700
Patent
active
042159261
ABSTRACT:
This invention relates to an improvement in the process for conducting ammonia in a developing apparatus for developing diazotype copying material, wherein exhaust air laden with gaseous ammonia and composed of the developer medium escaping from a developing chamber and air, is conducted in at least one absorption vessel countercurrently to water capable of absorbing ammonia; wherein the ammonia water of relatively low concentration thus obtained is conducted in an evaporator countercurrently to a stream of water vapor; and wherein the ammonia gas/water vapor mixture thus obtained is used for preparing the gaseous developer medium; the improvement comprising completely condensing the ammonia gas/water vapor mixture discharged from the evaporator to form ammonia water of a relatively high concentration; storing the ammonia water in an ammonia water supply tank; introducing the ammonia water discharged from the ammonia water supply tank, at a constant rate, into an evaporator which is in direct connection with the developing chamber; and passing the ammonia gas/water vapor mixture produced by evaporation from the evaporator into the developing chamber. The invention also relates to an apparatus for performing the process.
REFERENCES:
patent: 1999546 (1935-04-01), Pyzel
patent: 4003069 (1977-01-01), Hilgers
Bryan James E.
Hoechst Aktiengesellschaft
Nozick Bernard
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