This plant consists of a liquid-liquid extraction column of glass with rotating discs installed aside a distillation column. This last column can be used to recover the solvent used for the extraction, or separately for the study of distillation process. The automated version is equipped with 2 PID controllers enabling to control the level in the extraction column and the flow rate of the water cooling the condenser of the distillation column.
TRAINING PROGRAM
This unit enables to deepen the following issues:
Extraction
• Determination of the number of transfer units
• Height of a transfer unit
• Extraction efficiency
• Mass balance
• Calculation of mass transfer coefficient
• Calculation of the number of theoretical stages
• Trend of concentrations along the column
• Exercises on systems of 3 partially mixable components:
– acetic acid – toluene – water
– acetic acid – isopropyl ether – water
– acetic acid – ethyl acetate – water
• Automatic control with PID controller
• Plant supervision by P.C.
Distillation
• Recovery of the solvent used in the extraction
• Distillation of different mixtures (water / ethanol, water / methanol, methanol / propanol, etc…) versus the variation of the following operational parameters:
– reflux ratio
– feeding flow rate
– reboiler heating power
– feeding composition
• Flooding
• Automatic flow control by PID controller
• Plant supervision by P.C.
TECHNICAL SPECIFICATIONS:
• Framework of AISI 304 stainless steel with castors
• 5 tanks of AISI 304 stainless steel , with capacity of 20 l
• Extraction column of borosilicate glass, DN50, consisting of 26 stages, h = 1500 mm, and including a disc stirrer of stainless steel, 2 separators of borosilicate glass and variable speed motor (0 to 1000 rpm)
• 2 metering pumps of AISI 316 stainless steel , with flow rate of 0-40 l/h
• Distillation column of borosilicate glass, DN 50, with vacuum jacket
• Reflux head of borosilicate glass
• Solenoid valve for controlling the reflux ratio
• Reboiler of AISI 316 stainless steel, with capacity of 7 l, for the distillation column
• Electric heater of AISI 316 stainless steel, P = 3000 W
• Thyristor unit for controlling the electric heater
• 2 timers for controlling the reflux ratio
• Over head condenser of borosilicate glass with exchange surface of 0.3 m2
• Flowmeter for the water feeding the head condenser, with range of 25 to 250 l/h
• 3 thermo-resistances Pt 100 with sheath of AISI 316 stainless steel
• 3 board-type electronic digital temperature indicators
• Tube-in-tube heat exchanger of AISI 316 stainless steel (cooling of column outlet product)
• Tube-in-tube heat exchanger of AISI 316 stainless steel (cooling of distillate)
• Tank of borosilicate glass, with capacity of 3 l, for collecting the column outlet product
• Graduated tank of borosilicate glass, with capacity of 1 l, for the collection fo distillate
• Piping and valves of AISI 304 and AISI 316 stainless steel
• Switchboard IP55, complying with EC conformity mark, including plant synoptic and ELCB
• Emergency button
Besides being provided with all the characteristics, this model also includes the following additional items:
• Interface for the connection with a PC included in the switchboard
• Data acquisition software for Windows
Besides being provided with all the characteristics, this model also includes the following additional items:
• Variable area flowmeter of AISI 304 stainless steel, with range of 25 to 250 l/h and 4-20 mA output signal
• Pneumatic valve of AISI 316 stainless steel, Cv = 0.32, for level control
• 2 pneumatic valves of AISI 316 stainless steel (level and flow control of condenser cooling water), Cv = 0.32
• 2 electro-pneumatic converters of 4 to 20 mA/ 0.2 to 1 bar
• 2 microprocessor digital PID controllers with serial card
• Supervision software for Windows: it enables to control ON-OFF signals, analog signals coming from PID controller, real-time trend and historical trend
