Liquefaction of coals using ultra-fine particle, unsupported catalysts: In situ generation by rapid expansion of supercritical fluid solutions Page: 4 of 70
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catalyst feed stock dissolution (i.e., the most severe being
supercritical H20 at 600 atm and 500 C). These conditions,
coupled with residence times as long as 100 minutes at these
severe conditions, should optimize the probability of achieving
dissolution of most catalyst materials identified for
consideration. Expansion nozzle characteristics have been
defined that will yield supercritical solution flow rates with an
upper bound of 20 cm'/min, which should give catalyst particle
generation rates that will produce reasonable coal material
A concrete, cost effective, preliminary design for the
particle collection, coal material impregnation section, which
follows downstream of the supercritical fluid catalyst particle
generator, has been developed. The first approach considered for
impregnating coal materials with catalyst particles was based on
a two-stage process. The first stage was an expansion region
which provided sufficient length for the supersonic expansion jet
to diffuse to a low momentum flow. The diffuser section would
then be followed by either a fluidized bed containing pulverized
coal, or a chamber containing a fine spray of coal derived
liquid. Since Brownian coagulation theory indicated that
particle coagulation time scales are short relative to the time
scale for diffusing the supersonic expansion jet, this approach
Brownian motion coagulation theory dictates that immediate
and intimate contact between the expansion jet and coal materials
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Liquefaction of coals using ultra-fine particle, unsupported catalysts: In situ generation by rapid expansion of supercritical fluid solutions, report, September 1, 1991; United States. (digital.library.unt.edu/ark:/67531/metadc1055388/m1/4/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.