[ K. D. P. Nigam]
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Research Facilities

Trickle-bed reactors

Trickle-bed reactors are a class of multiphase reactors used extensively in petroleum refining industries, waste water treatment and bioprocesses.

There is a major contribution of our group in scale-up and design of trickle bed reactors (TBR) towards attaining the environment friendly economic growth of our society. We have focused four major areas-Hydrodynamics, Liquid Maldistribution and Partial Wetting, Mixing Characteristics and Modeling. The hydrodynamics and residence time distribution studies were carried out in a pilot plant of 2.5 cm, 5 cm, 15 cm and 30 cm diameter reactor which can be operated upto pressure of 25 bar and temperature of 1000C. A theoretical model based on first principle has been developed to predict design parameters such as pressure drop, liquid holdup and wetting efficiency for industrial Trickle-Bed Reactor


Unique Features

  • Measures pellet-scale external wetting efficiency in trickle bed reactors
  • Can be operated for a wide range of pressure and temperature (Temperature: 28 0C to 250 0C and Pressure; 0 40 bar g)
  • Contains a CCD video Camera with video adaptor
  • Falcon software for saving images in BMP format with full color video resolution in high quality
  • Studies of spreading, surface treatments, spreading rates
  • Adhesion, wetting of fibers and flats, optimization of resins
  • Control droplet surface area to increase or decrease evaporation, optimal wetting of heat exchanger surfaces

Innovative Heat Exchanger

  • It is usually desired to achieve uniform reaction conditions or lower temperature gradients to improve the performance of flow reactors and heat exchangers.
  • Narrower residence time and thermal time distributions can be obtained by increasing the mixing between the fluid elements of different age groups and temperatures.
  • Commercial motionless mixers and flow inverters are employed in industrial practice to enhance heat transfer coefficient and to provide more uniform thermal and compositional environments.
  • Helical coils also find extensive use owing to the cross-sectional mixing induced by centrifugal force.
  • A Very simple and extemely effective technique, has been developed to cause multiple flow inversions at low flow rates just sufficient for secondary flow to fully develop.

CFC Pilot Plant

  • Caustic extraction of H2S Carbonyl sulfide, CO2 and mercaptans from gases, LPG and naphtha
  • Caustic extraction of naphthenic acids from jet fuel, kerosene and middle distillate
  • Caustic extraction of aromatic mercaptans and organic acids from cracked naphtha and cycle oil
  • Caustic extraction of hydrogen chloride from reformer gas and liquid product streams
  • Sweetening of FCC gasoline by mercaptan sulfur catalytic oxidation

Static Mixer Unit

  • No moving parts Low maintenance costs
  • Low shear forces
  • 10 to 100 times less energy compared with agitated vessels/extruders
  • Controlled mixing quality
  • Plug flow behavior
  • Needs small space
  • Low investment and operating costs
  • No mechanical seals

Bubble Column Reactor

K D P Nigam, IIT Delhi.Updated by Krishan Best View in IE 4.0 and above in 800X600 resolution. Designed by Ashok