Environmental Engineering Reference
In-Depth Information
tABle 12.2 (continued)
jsA/jhA on cleaning a small chemical reactor by experienced and
trained Personnel
Potential Accidents
or hazards
recommended safe
job Procedure
sequence of Basic job steps
. 6.. Ground.and.bond.acetone.
drums.near.reactor.
. 6.. Static.electricity.can.ignite.
acetone.in.drums.
. 6.. Grounding.or.drums.will.
give.zero.static.charge.to.
drum..Bonding.the.drum.to.
the.reactor.will.ensure.that.
the.drum.and.the.reactor.are.
at.the.same.static.charge..
(Reactors.are.permanently.
grounded.).Solvents.are.not.
allowed.to.freefall..All.
loadings.are.from.the.bottom.
of.the.vessel.or.through.dip.
tubes.in.the.reactor.
. 7.. Charge.material.into.reactor.
to approximately.25-50%.full.
by.eye.
.7a.. Drums.may.be.pressurized,.
causing.material.to.be.sprayed.
when.cap.is.loosened.
.7b.. Vapors.from.mixture.can.get.
into.vacuum.pump.and.cause.
explosion.
.7a.. Wear.full-face.shield.and.
butyl.gloves,.in.addition.to.
normal.PPE..Bring.local.
ventilation.hose.next.to.
drum.bung..Open.bung.
slowly.to.vent.any.pressure.
.7b.. Use.residual.vacuum.when.
loading.materials.
. 8.. Turn.on.cooling.water.to.
condenser.
. 8.. Without.suficient.cooling.in.
condenser,.vapors.will.reach.
scrubber.blower.motor.and.
cause.a.ire.
. 8.. Open.cooling.water.valves.
to.condenser..Watch.spinner.
in.line.to.make.certain.there.
is.water.low.
. 9.. Open.vent.on.reactor.
. 9.. Opening.a.reactor.vent.
valve while.under.vacuum.
will.cause.any.material.in.
vent.line.to.be.pulled.into.
reactor,.possibly.creating.a.
violent.reaction.
. 9.. Increase.reactor.pressure.to.
5.psig.with.nitrogen..Shut.
off.nitrogen.low.and.open.
reactor.vent.valve.slowly.
.10.. Heat.batch.until.acetone.
reluxes.(56°C).
.10.. Putting.too.much.heat.into.
the.batch.can.cause.vapors.
to.pass.through.the.
condenser,.reach.the.
scrubber.blower.motor,.
and cause.a.ire.
.10.. Use.70°C.hot.water.in.
reactor.jacket.to.heat.batch,.
using.maximum.water.low..
Watch.vapor.condensation.
level.in.condenser.and.adjust.
hot.water.temperature.to.
make.level.about.half.to.
two-thirds.up.the.condenser.
