A Laboratory Evaluation of Precoat Filtration Parameters for the Solvent Refined Coal Process

Abstract

The effect of temperature, pressure, filter cake thickness, and filter cake compressibility upon the filtration rate of unfiltered oil from the Solvent Refined Coal liquefaction process was determined using a laboratory scale precoat filtration system.

Charge and Filtration of Solvent Refined Coal Suspensions

“…Rotary-drum filtration with a diatomaceous earth precoat is the accepted method for achieving thorough ash 0019-7882/79/1118-0708801.00/0 removal. Although many studies are available on improving ash filtration, the process still suffers from slow filtration rates and nearly prohibitive equipment costs (Smith and Martin, 1977;Rodgers, 1977;Katz and Rodgers, 1976). High-gradient magnetic separation, cross flow filtration, electro-cross flow filtration, centrifugation, and hydrocyclones have been proposed (Maxwell, 1976; Snell and Simone, 1976;Walden Research, 1976; Office of Coal Research, 1973, Phinney, 1975.…”