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Continuous azeotropic distillation


Service : 230 V / 50 Hz / Single phase: 6 kW.
Cold water 20 ° C / 3 bar: 2 m3 / h.
Sewer.
Dimensions : 2,9 m x 0,75 m x 3,45 m
Poids : 200kg

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Principle of operation :

Distillation allows the separation of a mixture of compounds having different boiling points. The boiling of the mixture makes it possible to obtain vapors of compositions different from the liquid. Re-condensations and multiple re-evaporations progressively enrich the vapor phase to the most volatile product. The vapors are condensed and then distributed between the distillate (recovered continuously) and the reflux via a column head valve. The residue is also recovered continuously from the bottom of the boiler.

Objectifs Pédagogiques :

 

  • Study of the hydrodynamics of packed columns and perforated tray columns.
  • Continuous distillation.
  • Azeotropic continuous distillation.
  • Comparison of packed columns and perforated tray columns.
  • Influence of the operating conditions on the separation of a binary solution
  • Thermal balances.
  • Material balance.
  • Determination of the number of theoretical plates (McCabe and Thiele, Ponchon and Savart).
  • Determination of the number of transfer units
Description technique :

Equipment

  • Storage can of the polyethylene feed solution.
  • Feeder dosing pump, stainless steel 316L - PTFE with manual control.
  • Feed preheater with two valves for supply at 33% or 66% of packed column, equipped with minimum level safety and maximum temperature safety.
  • Continuous boilers in borosilicate glass, electric heating, each equipped with a minimum level of safety and maximum temperature safety.
  • Refrigerants for differential pressure test
  • Column made of borosilicate glass in three elements with "multiknit" type 316L stainless steel insulation, insulated.
  • Borosilicate glass column in three elements with 3 perforated trays.
  • Three 316L stainless steel recentering trays on each column, each equipped with sampling and temperature sampling valve.
  • Borosilicate glass column heads with temperature measurement, equipped with a timer valve to control the reflux ratio.
  • Vertical 316L stainless steel condensers, borosilicate glass ferrule, single acting with PTFE baffles.
  • Hetero-azeotropic decanter with light-phase sampling valve for recycling to the 316L perforated plate column, heavy-phase sampling valve for recycling to the 316L stainless steel packed column with interface level adjustment and 316L stainless steel cooling coil.
  • Refrigerant - decanter trap in stainless steel 316L.
  • Two refrigerants of distillate and residue in 316L stainless steel.
  • Recipe for borosilicate glass distillate for each column.
  • Recipe of borosilicate glass residue for each column
  • Four cans for receiving distillates and polyethylene residues.
  • 316L stainless steel connection pipes for the process and reinforced PVC for the cooling fluid.
  • Support frame in 304L stainless steel tubes and aluminum nuts.


Instrumentation

  • Cooling water supply for condensers each equipped with a float flowmeter with their control valve and water circulation controller for heating shutdown due to lack of cooling.
  • Column pressure drop measurements using differential U-shaped pressure gauges.
  • Control and control cabinet, IP55, equipped with emergency stop, operating buttons and the following interfaces:
  • Preheater temperature controller.
  • Controllers for the temperature of the column heads controlling the sampling or reflux valves of the distillates.
  • Boiler heating control regulators.
  • Four digital temperature indicators (two per column) of 21 probes type Pt100 Ω.
Options :
Option 1: Touch screen to view temperatures. With data storage and data recovery on USB stick in .txt files.
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