In countercurrent distillation (rectification) using a column, the rising vapour can enter into interactions with the condensate. In this manner, a fractional distillation, i.e. a distillation in several steps for the separation of substances with similar boiling points, can be performed in a single apparatus. If bubble tray columns are used condensate can be removed from the individual bubble trays.
Investigate the mode of operation of a fractionating tower on a two-stage bubble tray column. Distil a mixture of three n-alcanes first with total reflux and then without any reflux. Subsequently, examine and compare the initial mixture, the sump product, the head products and the condensates of both trays gas chromatographically.
| Materiallist (Excerpt) |
Product |
Amount |
|
Set of Precision Balance Sartorius CPA 623S and measure software, 230 V
|
49224-88
|
1
|
|
Cobra3 Chem-Unit, USB
|
12153-50
|
1
|
|
Immersion thermostat Alpha A, 230 V
|
08493-93
|
1
|
|
Control unit gas chromatograph
|
36670-99
|
1
|
|
Bubble tray column, model, with 2 trays
|
35914-15
|
1
|
|
Steel cylinder Helium, 2l, filled
|
41776-00
|
1
|
|
Glass jacket
|
02615-00
|
1
|
|
Heating mantle for roundbottom flask, 250 ml, 230 V,with saftey switch
|
49542-93
|
1
|
|
Dinonyl phthalate, 100 ml
|
31276-10
|
1
|
|
Mesure probe for gas chromatograph, BNC contact
|
36670-10
|
1
|
|
Gas separation column
|
36670-00
|
1
|
|
Microliter syringe, 10 micro-l
|
02607-00
|
1
|
|
Power regulator
|
32288-93
|
1
|
|
Sec.bottle500ml,2xGl18/8,1x25/12
|
34170-01
|
1
|
|
Software Cobra3 Chem-Unit
|
14520-61
|
1
|
|
Immers. probe NiCr-Ni, teflon, 200°C
|
13615-05
|
3
|
|
Column head, with stopcock, ST 19/26
|
35919-01
|
1
|
|
Bath for thermostat, Makrolon
|
08487-02
|
1
|
|
Condenser,Dimroth,IGJ19/26,210mm
|
35816-05
|
1
|
|
Reducing valve for CO2 / He
|
33481-00
|
1
|
|
Separating funnel,50ml,GL18
|
35853-15
|
1
|
|
Table stand f.2 l steel cylinders
|
41774-00
|
1
|
|
Temp. probe, imm. type, Pt1000, Cobra3
|
12123-00
|
1
|
|
Chromosorb, PAW, 80/100 Mesh, 20 g
|
31514-04
|
1
|
|
External circulation set for thermostat Alpha A
|
08493-02
|
1
|
|
Retort stand, 210 mm × 130 mm, h = 500 mm
|
37692-00
|
1
|
|
Round bottom flask, 250 ml, 2-neck, GL25/12, GL18/8
|
35843-15
|
1
|
|
Power supply 12V / 2A
|
12151-99
|
1
|
|
Cooling jacket, GL 25/8
|
34880-01
|
1
|
|
Spring manometer, 0...-1000 mbar
|
34170-02
|
1
|
|
Quartz glass wool 10 g
|
31773-03
|
1
|
|
Soap bubble flow meter
|
36675-00
|
1
|
|
Gasket for GL18, 8mm hole, 10 pcs
|
41240-03
|
1
|
|
Water jet pump, plastic
|
02728-00
|
1
|
|
Connecting tube,IGJ 19/26-GL25/12
|
35800-05
|
1
|
|
Stopwatch, digital, 1/100 s
|
03071-01
|
1
|
|
Water, distilled 5 l
|
31246-81
|
2
|
|
Protective sleeves f.temp.probe,2
|
11762-05
|
1
|
|
Connecting caps,10 pcs, GL18
|
41230-03
|
1
|
|
Connecting tube,IGJ29/32-GL18/8
|
35678-02
|
1
|
|
Silicon grease Molykote, 50 g
|
31863-05
|
1
|
|
Support rod, stainless steel, 1000 mm
|
02034-00
|
2
|
|
Stopcock,3-way,t-shaped, glass
|
36731-00
|
1
|
|
n-pentane 250 ml
|
31707-25
|
1
|
|
Clamp for heating mantle
|
49557-01
|
1
|
|
n-heptane, extra pure 250 ml
|
31366-25
|
1
|
|
Teflon sleeve IGJ 29, 10 pcs
|
43617-00
|
1
|
|
Support rod, stainless steel, 750 mm
|
02033-00
|
2
|
|
Teflon sleeve IGJ 19, 10 pcs
|
43616-00
|
1
|
|
n-hexane,puriss. 100 ml
|
31369-10
|
1
|
|
Acetone, chem.pure 250 ml
|
30004-25
|
1
|
|
Data cable, plug/ socket, 9 pole
|
14602-00
|
1
|
|
Wrench for steel cylinders
|
40322-00
|
1
|
|
Boiling beads, 200 g
|
36937-20
|
1
|
|
Round-bott.flask, 500ml,IGJ 29/32
|
35862-00
|
1
|
|
Universal clamp
|
37715-00
|
12
|
|
Pasteur pipettes, 250 pcs
|
36590-00
|
1
|
|
Lab thermometer,-10..+100C
|
38056-00
|
1
|
|
Glass tubes,l.250 mm, pkg.of 10
|
36701-68
|
1
|
|
Rubber tubing,vacuum,i.d.6mm
|
39286-00
|
2
|
|
Right angle clamp
|
37697-00
|
14
|
|
Support rod, stainless steel, l = 250 mm, d = 10 mm
|
02031-00
|
1
|
|
Rubber caps, pack of 20
|
02615-03
|
1
|
|
Snap-cap vials,d=24mm,h=52mm,10p.
|
33621-03
|
2
|
|
Dish, plastic, 150x150x65 mm
|
33928-00
|
1
|
|
Graduated cylinder 100 ml
|
36629-00
|
1
|
|
Rubber caps, 10 pcs
|
39275-03
|
1
|
|
Glass beaker DURAN®,tall, 150 ml
|
36003-00
|
2
|
|
Glass beaker DURAN®, tall, 250 ml
|
36004-00
|
1
|
|
Clamp f.ground joint,plastic,NS19
|
43614-00
|
2
|
|
Glass tube, straight, l=80 mm, 10/pkg.
|
36701-65
|
1
|
|
Connecting cord, 32 A, 250 mm, red
|
07360-01
|
1
|
|
Connecting cord, 32 A, 250 mm, blue
|
07360-04
|
1
|
|
Stopper,IGJ 29/32,glass,clear
|
41256-10
|
1
|
|
Funnel, glass, top dia. 80 mm
|
34459-00
|
1
|
|
Lab. pencil, waterproof
|
38711-00
|
1
|
|
Spoon, special steel
|
33398-00
|
1
|
|
Funnel, glass, top dia. 55 mm
|
34457-00
|
1
|
|
Glass tube, right-angled
|
36701-07
|
1
|
|
Rubber tubing, i.d. 6 mm
|
39282-00
|
10
|
|
Hose clip, diam. 8-16 mm, 1 pc.
|
40996-02
|
10
|
|
Hose clip f.12-20 diameter tube
|
40995-00
|
4
|
|
Glass rod,boro 3.3,l=200mm, d=5mm
|
40485-03
|
1
|
|
Laboratory Experiments Physics, Chemistry, Biology andApplied Sciences, CD-ROM, incl. operating manuals
|
16502-42
|
1
|
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