The old Benzene/Toluene splitter of the Organic Synthesis Factory of Jilin Chemical Industrial Corp. was a valve tray column. The maximum capacity is 10m3/h. In Aug. 1997, it was revamped with JCPT tray by our Tianjin Corp. When the trays were changed in the revamping, only the old trays were replaced by Jet Coflow Packing Trays nothing else were changed. The support rings, downcomers, weirs, clearance under downcomer were remained as the same. After revamping, the column efficiency was increased and the capacity was increased to 14m3/h (for the pumps and other reasons, the upper operating limit not reached).

    Feed composition:

Benzene 53~56%
Toluene 26~30%
xylene 14~21%

Parameter comparing:

Content

Before revamping

After revamping

column type

valve tray

JCPT tray

column diameter

1200mm

1200mm

tray number

54

54

tray spacing

450mm

450mm

number of passes

single

single

weir length

794mm

794mm

outlet weir height

69mm

69mm

downcomer clearance

30mm

30mm

downcomer width

150mm

150mm

tray hole diameter

39 mm

80mm

tray hole number

112

24

feed capacity

10m3/h

14m3/h

pressure on the top

0

0

temperature on the top

83ºC

83ºC

pressure on the bottom

0.04MPa

0.025MPa

temperature on the bottom

125ºC

120ºC

vapor flowrate

1.11m3/s

1.55m3/s

vapor density

3.84kg/m3

3.84kg/m3

liquid flowrate

25m3/h

35m3/h

liquid density

770kg/m3

770kg/m3

composition on the top, Benzene

99.5%

99.9%

composition on the bottom, Benzene

ppm

ppm

 

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