
Deashing of coal liquids with ceramic membrane microfiltration and diafiltration. Final quarterly technical progress report, October 1--December 31, 1994
Publication year - 1994
Language(s) - English
Resource type - Reports
DOI - 10.2172/78785
Subject(s) - microfiltration , diafiltration , coal , diluent , waste management , demineralization , residual , residual oil , environmental science , refinery , process engineering , engineering , petroleum engineering , membrane , materials science , chemistry , computer science , biochemistry , enamel paint , algorithm , composite material , nuclear chemistry
Diafiltration experiments were done to determine how much particulate- free oil could be extracted from the solids-containing stream. The 0. 05 {mu}m titania membrane was used for the concentration/diafiltration process runs at 270 C, 80 psig inlet pressure, and 6 gpm crossflow. Five concentration process runs were conducted. After the initial run, the concentrated material was diluted with hydrotreated start-up oil from the final solids back to 10% solids. The concentration was limited by increased pressure drop with increased solids content and plugged membrane module channels. Solids retention was greater than 99.5% for all samples. Attempts to clean membranes with solvent failed due to lack of time. Samples of the permeate and concentrate streams were taken for analysis; the diluent had a similar bp range to the coal liquids in the atmospheric bottoms; thus, distillation could not be used to separate the bottoms from the diluent