 They have been also used in pyrolysis gasoline (benzene) removal from quench water in ethylene plants, although in this application, the constant changing of cartridges can lead to operator exposure to BTX (benzene, toluene and xylene), as well as disposal issues and high operating costs from frequent replacement.Electrostatic coalescers use electrical fields to induce droplet coalescence in water-in-crude-oil emulsions to increasing the droplet size.The squared dependence of droplet diameter in Stokes Law, increase the settling speed and destabilizes the emulsion.