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Recovery of Nitrobenzene

Background
Company is a leading manufacturer of aniline, nitrobenzene and toluene di-isocynate.

Process Overview
One of the main finished products, nitrobenzene (NB), stream from the plant and is washed with water to remove dissolved acids. The resulting effluent water containing some amount of NB needs to be further stripped in the steam stripper to reduce the NB concentration, thus reducing load on the effluent treatment plant (ETP).

Customer Requirements
The customer was in the process of revamping the NP plant in order to increase capacity. They wanted to check if the existing steam stripper with valve trays having a capacity of 12m 3/hr could handle the effluent generated from revamped plant generating 16m3/hr of effluent after revamping.

Problem analysis
Munters studied the existing stream stripper and concluded that:

  • The existing trays would not sustain the increased load of 16m3/hr.
  • Final bottoms from the existing column contained 1600-2000 ppm of NB, this effluent resulted in increased load on ETP plant since the COD value was high.
  • The pressure drop of the column was high which was resulting in increased energy consumption.

Solutions provided
Munters suggested replacement of existing steam stripper valve trays with high capacity valve trays to reduce the pressure drop across the column and increase the column capacity to 16m3/hr.

The column hydraulic ratings using mega valve trays was done. Munters had internally anticipated reduction of NB concentration of effluent to 500-800 ppm level.

Accordingly, the trays were manufactured, supplied and installed.

Results achieved
The steam stripper with mega valves after commissioning achieved:
  • Enhanced capacity of 16m3/hr.
  • Reduction of NB concentration to 600 – 1000 ppm level.
  • Recovery of 300 kg/day additional NB from the effluent.

snelle feiten

  • Customer: Petrochemical industry
  • Location: Western India
  • Tower Name: Waste water stripper
  • Tower Diameter: 800 mm
  • Mass Transfer Equipment: Valve trays

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