Page 21 - PIGNAT catalogue 2020 GB_092020

CRYSTALLIZATION

CCE/2000 CRYSTALLIZATION BY EVAPORATION

➢ Study & observe crystallization through concentration

Batch evaporation / crystallization under reduced pressure

Study different types of stirrer
Three-blade propeller, turbine, anchor

Limite de la
Concentration zone métastable Courbe de
solubilité
Zone de nucléation
spontanée Zone
métastable
Nucléation primaire
B

C A
www.pignat.com
www.pignat.com Cristallisation par évaporation Température

non ensemencée

Supervision - Data acquisition General specifications • Mechanical hoist.

• Glass tank, SS double jacket
bottom. SS flat cover. Instrumentation
• 3 temperature probes Pt100Ω.
• 2 vacuum gauges.
• Variable stirrer with 3 types:
profiled three blade, Rushton • 2 pressure gauges.
turbine, anchor. • 2 flowmeter.

• Condenser : glass shell and SS coil.

• Glass graduated vessels.

• Vacuum circuit, with diaphragm
vacuum pump.
From a solution where one or several solids are dissolve the crystallisation
allows the separation. • Water circuit 200 - 240 V Water Steam
1ϕ ou 3ϕ - 50/60 Hz 1000 L/h 10 kg/h max
During the separation, when we reach the temperature and the concentra- Dim : 250 x 70 x 300cm - 250 kg
tion needed, the dissolved compounds in the solution turns into solid.
Stirring system
Then, during the filtration step, the crystals are separated from the liquid
phase.

The partial evaporation of the solvent, and the obtained concentrated Option
solution cooling allows the crystallisation. Steam boiler.

The process is discontinuous, the whole solution is fill at the manipulation
beginning, the evaporation is finished when the solvent quantity for have
the concentration desired to extract obtained. The crystallisation is btained
by concentrated solution cooling, then the solution crystals are separated
with a filter.

Chemical engineering & unit operations 21