The crystal size may be regulated easily
by the volumn of steam admitted and by the
amount of spray used in the condenser. Large
volumns of steam and small amount of spray give
large crystals which are desirable.
Tne mixture of distilled acid and water
is collected large enameled buckets which
are cooled in water and then dumped into a 30*
centrifuge with tinned basket and enameled shell,
Tbe crystals are completely dried after whirling
by spreading enameled pans 3ft. square by
3 1/2* deep and placing in a vacuum oven for
one Dour at 100", The dry product is packed in
1^ and 5# double paper bags. The centrifuge
liquor is used to make up fresh sodium poenate
solution. The yield of pure acid from a good
crude is about 95%. A tarry crude may give as
low as 80%. 100% yield on 500# pbenol is 7S4i^.
Pig. 12 sbows tbe vacuum oven used and Pig. 13
a distilling plant for benzoic and salicylic
acids erected at Leipzig by "Opitz u. Klotz"
nandlmg 10,000* acid per day
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