Filtering coal liquids: clogging phenomena in the filtration of liquefied coal

Journal Article · Tue Dec 01 04:00:00 EST 1981 · Chem. Eng. Prog.; (United States)

OSTI ID:5571456

Tiller, F M; Chow, R; Weber, W; Davies, O

Separation of solids consisting of mineral residue and unconverted carbon is of critical importance to production of liquefied coal. Filtration has not yielded desired results because of high flow resistance of cakes. In this article, pilot plant data have been analyzed on the basis of continuous clogging of pores of both the supporting medium and the compressible cake. The classical equation of filtration is modified on an empirical basis to account for migration and deposition of fine particles. Constant-pressure filtrations have been analyzed on the basis of a presumed parabolic relation of volume to time. It is shown that clogging of pores in both medium and cake by asphaltenic type particles is highly deleterious to rates. Consequently, improved filtration depends on diminishing the number of submicron particles in the reactor or on introducing an additional pretreatment process prior to filtration. 15 refs.

• Research Organization: Univ of Houston, Tex, USA
• OSTI ID: 5571456
• Journal Information: Chem. Eng. Prog.; (United States), Journal Name: Chem. Eng. Prog.; (United States) Vol. 77:12; ISSN CEPRA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
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Lignite
& Peat-- Hydrogenation & Liquefaction
COAL LIQUEFACTION PLANTS
COAL LIQUIDS
FILTERS
FILTRATION
FLUIDS
FUELS
INDUSTRIAL PLANTS
LIQUIDS
MECHANICAL FILTERS
SEPARATION PROCESSES
SOLVENT-REFINED COAL