Environmental Engineering Reference
In-Depth Information
tABle 12.2
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
. 1.. Check.with.lab.manager.
for proper.cleaning.solvents.
and.PPE.
. 1.. Putting.an.incompatible.
chemical.into.the.reactor.
may.cause.a.violent.reaction..
Residual.contents.of.reactor.
may.have.harmful.effects.
. 1.. The.lab.manager.knows.the.
last.material.in.the.reactor.
and.will.determine.proper.
cleaning.solvent.along.with.
appropriate.PPE.for.that.
solvent..Lab.manager.will.
also.provide.proper.batch.
operating.temperatures.
. 2.. Bring.drum.of.material.to.
reactor.along.with.empty.drum.
for.waste..(For.these.purposes,.
the.solvent.will.be.acetone.)
. 2.. Moving.drums.manually.can.
cause.back.or.muscle.strain..
Drums.can.tip.easily.when.
being.moved.manually.
. 2.. Use.drum.truck..Use.proper.
technique.when.loading.and.
unloading.drums..Wear.
leather.gloves.when.handling.
drums.or.drum.truck.to.avoid.
hand.abrasion.from.rough.
surfaces.
. 3.. Check.ventilation.system.
for draw.
.3a.. If.ventilation.system.is.not.
working,.any.fumes.from.
drums.or.reactor.will.stay.
in area.
.3b.. If.the.drive.motor.belts.
break,.the.motor.will.
continue.to.run.but.no.
ventilation.will.be.provided.
.3c.. A.visual.signal.is.always.a.
good.indicator.that.the.
system.is.operational.
.3a.. Check.the.system.running.
lights.to.ensure.that.they.are.
all.green.
.3b.. Check.the.alarm.system.to.
guarantee.that.the.alarm.will.
sound.if.air.movement.stops.
.3c.. Hold.a.tissue.or.wipe.in.front.
of.the.local.exhaust.port.to.
visually.ascertain.that.there.
is.draw.
. 4.. Visually.check.the.reactor.
system..Make.sure.that.all.
valves.feeding.the.reactor.
are closed,.and.that.digital.
and manual.temperature.
indicators agree.
. 4.. Loading.material.on.top.
of unknown.material.can.
cause a.violent.reaction..
A discrepancy.in.temperature.
indicators.indicates.that.one.
is.out.of.calibration..Running.
in.this.mode.can.cause.the.
batch.to.over-.or.underheat.
. 4.. Make.certain.that.reactor.is.
empty.by.looking.through.
glass.port.on.top.of.vessel..
Call.an.instrument.person.to.
verify.the.calibration.of.the.
temperature.sensors.
. 5.. Inert.the.reactor..(Pull.vacuum.
on.reactor..When.28”.reached,.
turn.off.vacuum.and.pressure.
with.nitrogen.to.15.psig..
Repeat.3.times.)
. 5.. Adding.a.solvent.to.a.reactor.
containing.oxygen.creates.
two-thirds.of.the.ire.
triangle..Friction.from.the.
stirring.shaft,.static,.and.heat.
from.the.reactor.seal.can.
ignite.the.mixture.and.result.
in.ire.or.explosion.
. 5.. Reducing.the.oxygen.
content.in.the.vessel.to.
below.2%.will.not.allow.
combustion.to.take.place.
continued
