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Related Experiment Videos

Solvent sublation for waste minimization in a process water stream - a pilot-scale study.

B G Bryson1, K T Valsaraj

  • 1Corporate Process Engineering, Borden Chemicals and Plastics, P.O. Box 427, Geismar, LA 70734, USA.

Journal of Hazardous Materials
|February 13, 2001
PubMed
Summary

Pilot-scale solvent sublation effectively removed naphthalene from process water. This adsorptive bubble separation process showed improved performance over conventional gas stripping and solvent extraction.

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Area of Science:

  • Environmental Engineering
  • Chemical Engineering
  • Separation Processes

Background:

  • Naphthalene contamination in industrial process water poses environmental challenges.
  • Conventional methods like gas stripping and solvent extraction have limitations in efficiency and naphthalene release.

Purpose of the Study:

  • To evaluate the pilot-scale performance of solvent sublation for naphthalene removal from process water.
  • To compare solvent sublation with conventional gas stripping and solvent extraction.

Main Methods:

  • Pilot-scale solvent sublation conducted at an acetylene plant using a 6-inch i.d. carbon steel column.
  • Employed white mineral oil as the organic solvent and nitrogen gas sparging via an annular shear sparger.
  • Operated in both two-phase and three-phase continuous modes at 140 degrees F.

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Main Results:

  • Naphthalene recovery was independent of oil flow rate but dependent on the nitrogen-to-water flow rate ratio.
  • Solvent sublation demonstrated significantly lower naphthalene release to the overhead gas space compared to conventional gas stripping.
  • The process showed superior performance over conventional gas stripping and solvent extraction.

Conclusions:

  • Solvent sublation is a highly effective adsorptive bubble separation technique for removing dilute naphthalene concentrations from industrial wastewater.
  • The process offers environmental benefits by minimizing volatile organic compound release.
  • Pilot-scale validation confirms the superiority of solvent sublation for naphthalene remediation in process water streams.