The NATCO ELECTRO-DYNAMIC DESALTER electrostatic desalting technology provides multiple phases of electrostatic mixing, coalescing, and settling in a single vessel, delivering nearly 100% salt and dehydration efficiency. The technology provides two-staged desalting efficiency without the excessive capital investments or space requirements common to conventional systems.


Comprising five proven Schlumberger process technologies, the NATCO ELECTRO-DYNAMIC DESALTER technology provides the refining industry with one of the first electrostatic desalting innovations in more than a decade.


Increase operating efficiency while reducing operational expenses

  • Under a variety of conditions, the NATCO ELECTRO-DYNAMIC DESALTER technology can
  •  Retrofit your single-stage system to two-stage performance
  •  Increase the levels of salt removal over any other single-vessel process
  •  Double the salt removal capacity of two-stage systems
  •  Reduce initial capital costs for new installations
  •  Allow higher inlet water cuts during upset conditions while maintaining specified effluent requirements
  •  Improve effluent water quality
  •  Improve operational flexibility by handling a wide range of feedstocks
  •  Decrease chemical consumption
  •  Improve mixing efficiency
  •  Reduce washwater requirements
  •  Require less space
  •  Provide improved dehydration capabilities.


Five steps to successful desalting

  1. NATCO DUAL POLARITY electrostatic treater—applies a high-gradient, sustained DC field between pairs of electrodes while maintaining an AC field between the electrodes and oil/water interface
  • Results: significant improvements compared with AC dehydration
  1. Composite electrodes—obtains a progressive electrical field
  • Results: coalescence of the smallest of water droplets while eliminating sustained arcing due to highly conductive emulsions
Composite Electrode
Composite Electrode

3. LRC-II smart interface—regulates the flow of electrical current and provides self-adjusting electrical power levels for optimized electrostatic coalescence

  • Results: optimal salt removal over a wide range of feed stock materials
  1. Countercurrent dilution water process—increases contact between dilution water, produced water, and particulate
  • Results: improved crude desalting using less washwater
  1. Electrodynamic mixing process—provides multistage contact
  • Results: near-100% mixing efficiencies while enabling reduced demulsifier chemical consumption

Project Reference