T
he standard 500 mL bottle (66CA) for
the 3910 Series Apparatus are made
with a heavy wall and a rounded bottom,
which reduces its actual capacity to about
470 mL. This bottle fits tightly inside
a wrap around metal screen that will
restrain flying glass in case of accidental
breakage. Smaller charges can be treated
in an alternate 250 mL bottle (66CA2)
which fits into the same bottle holder but
requires an additional spacer spool to
compensate for the differences in bottle
heights. Special bottles with smaller
capacities down to 50 mL or less can be
constructed for treating micro samples.
(Augustine describes a micro hydrogena-
tion bottle that can be made by sealing a
50 mL or smaller heavy walled flask inside
a larger bottle.)
Bottles for the larger 3920 Series
Apparatus are made in several sizes from
1000 to 2250 mL all of which fit into the
same bottle holder. One each of the plain
1000 and 2000 mL bottles is furnished
with each 3920 Series Hydrogenator.
These are carefully selected, machine
blown bottles which, because of their
large size, are restricted to 40 and 30 psig
working pressures. If higher pressures up
to 60 psig are required for treating large
amounts of reactants, users are urged to
purchase the special 2250 mL heavy duty
bottle (72CA4) which is made specifically
for this purpose. This is a hand blown,
borosilicate glass bottle with an extra
heavy wall that is much stronger than
the standard machine-made bottles. Or,
for reactions that can be handled satis-
factorily in stainless steel, there is a 1825
mL bottle made of T316 Stainless Steel,
which can be installed in any 3920 Series
Apparatus. This bottle with a stainless
steel cover and O-ring seal will withstand
working pressures up to 65 psig.
Safety Considerations
P
arr Shaker Type Hydrogenators are
usually operated in an open labora-
tory without additional barricades or
protective screens, but the operator must
realize that additional protection may be
necessary if there is any possibility that
a reaction may run out of control, or if
unexpected bottle breakage would pro-
duce a hazardous spill of toxic or flamma-
ble materials. Potentially explosive reac-
tions are best handled with the apparatus
located behind a suitable barricade or in a
pressure test cell.
There must be no gas burners or open
flames near a hydrogenation apparatus.
The room must be well ventilated and any
gas released from the apparatus should
be discharged into an explosion proof
Bottle Clamp for 3921 Apparatus with Guard Screen Removed.
Shaker Type Hydrogenation Apparatus
P a r r I n s t r u m e n t C o m p a n y
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