· Specifically, the coal tar distillate feedstock should be heated under pressure with the pressure at least about 20 psig, preferably in the range of from about 30 psig to about 100 psig. Higher pressures can be employed, but would require more expensive coking vessels.
· An indiion of this statement can be seen on Figure IV where the maximum current density for Quarto 4 was 13 amperes per cubic meter per hour (3 amps/gpm). The slurry was also coagulated at substantially lower current densities. By comparison, the lowest effective current density at Quarto 7 was amperes per cubic meter per hour (5 amps/gpm).