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Title: Cross-flow electrofilter and method

Abstract

A filter for clarifying carbonaceous liquids containing finely divided solid particles of, for instance, unreacted coal, ash and other solids discharged from a coal liquefaction process is presented. The filter includes two passageways separated by a porous filter medium. In one preferred embodiment the filter medium is of tubular shape to form the first passageway and is enclosed within an outer housing to form the second passageway within the annulus. An electrode disposed in the first passageway, for instance along the tube axis, is connected to a source of high voltage for establishing an electric field between the electrode and the filter medium. Slurry feed flows through the first passageway tangentially to the surfaces of the filter medium and the electrode. Particles from the feed slurry are attracted to the electrode within the first passageway to prevent plugging of the porous filter medium while carbonaceous liquid filters into the second passageway for withdrawal. Concentrated slurry is discharged from the first passageway at an end opposite to the feed slurry inlet. Means are also provided for the addition of diluent and a surfactant into the slurry to control relative permittivity and the electrophoretic mobility of the particles.

Inventors:
 [1];  [2];  [3]
  1. (Northbrook, IL)
  2. (Chicago, IL)
  3. (Westmont, IL)
Issue Date:
Research Org.:
Illinois Inst. of Tech., Chicago
OSTI Identifier:
863657
Patent Number(s):
4224135
Assignee:
United States of America as represented by United States (Washington, DC) OSTI
DOE Contract Number:  
EF-77-S-02-4324
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
cross-flow; electrofilter; method; filter; clarifying; carbonaceous; liquids; containing; finely; divided; solid; particles; instance; unreacted; coal; ash; solids; discharged; liquefaction; process; passageways; separated; porous; medium; preferred; embodiment; tubular; shape; form; passageway; enclosed; outer; housing; annulus; electrode; disposed; tube; axis; connected; source; voltage; establishing; electric; field; slurry; feed; flows; tangentially; surfaces; attracted; prevent; plugging; liquid; filters; withdrawal; concentrated; opposite; inlet; means; provided; addition; diluent; surfactant; control; relative; permittivity; electrophoretic; mobility; tubular shape; liquids containing; feed slurry; solid particles; outer housing; liquefaction process; electric field; preferred embodiment; coal liquefaction; finely divided; filter medium; carbonaceous liquid; porous filter; electrode disposed; slurry feed; unreacted coal; solid particle; prevent plugging; concentrated slurry; carbonaceous liquids; clarifying carbonaceous; solids discharged; divided solid; containing fine; containing finely; /204/

Citation Formats

Gidaspow, Dimitri, Lee, Chang H., and Wasan, Darsh T. Cross-flow electrofilter and method. United States: N. p., 1980. Web.
Gidaspow, Dimitri, Lee, Chang H., & Wasan, Darsh T. Cross-flow electrofilter and method. United States.
Gidaspow, Dimitri, Lee, Chang H., and Wasan, Darsh T. Tue . "Cross-flow electrofilter and method". United States. https://www.osti.gov/servlets/purl/863657.
@article{osti_863657,
title = {Cross-flow electrofilter and method},
author = {Gidaspow, Dimitri and Lee, Chang H. and Wasan, Darsh T.},
abstractNote = {A filter for clarifying carbonaceous liquids containing finely divided solid particles of, for instance, unreacted coal, ash and other solids discharged from a coal liquefaction process is presented. The filter includes two passageways separated by a porous filter medium. In one preferred embodiment the filter medium is of tubular shape to form the first passageway and is enclosed within an outer housing to form the second passageway within the annulus. An electrode disposed in the first passageway, for instance along the tube axis, is connected to a source of high voltage for establishing an electric field between the electrode and the filter medium. Slurry feed flows through the first passageway tangentially to the surfaces of the filter medium and the electrode. Particles from the feed slurry are attracted to the electrode within the first passageway to prevent plugging of the porous filter medium while carbonaceous liquid filters into the second passageway for withdrawal. Concentrated slurry is discharged from the first passageway at an end opposite to the feed slurry inlet. Means are also provided for the addition of diluent and a surfactant into the slurry to control relative permittivity and the electrophoretic mobility of the particles.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {1}
}

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