condensation we explain the "strange" dependences ob- served in this study or described in the literature. We have simulated jet fuel dearomatization taking in-.
React.
Kinet.
Catal.
Lett.,
Vol.
53, No.
2, 253-259
(1994)
RKCL2507
CATALYTIC
REACTIONS
ACCOMPANIED
I. FORMULATION N.M.
Ostrovskii,
N.M.
Omsk Department
of Boreskov
phase
significantly small ones
We have
Capillary pore
644040,
Russia
in particular
conditions
motor
appear
Regarding
the "strange"
study or described
to differ and
capillary
dependences
ob-
taking
in-
is widely used for testing
the
condensation
condensation structure
fuel
in the literature.
jet fuel dearomatization
capillary
gas-
(filled with gas)
liquid).
we explain
simulated
to account
catalyst
Reaction
(filled with
in this
of Catalysis
found to accompany
in large pores
condensation served
was
reactions,
hydrotreatment.
Duplyakin
February 18, 1994 March 28, 1994
condensation
catalytic
and V.K.
Institute
54, Omsk,
Received Accepted
CONDENSATION.
OF THE PROBLEMS
Bukhavtsova
Neftezavodskaya
Capillary
BY CAPILLARY
as well.
based on the Kelvin
equation:
in P/Ps = OVm/rmRT where
P, Ps - are the partial
pressure
of a condensing
face tension; cus radius
respectively;
vapor
a is the sur-
r m is the liquid menis-
in this work show that capillary
at some large scale processes
and pressures.
is gaseous
and saturated
T is the temperature.
made
takes place
temperatures mixture
component,
V m is the molar volume;
in a pore;
The estimates densation
pressure
(vapors),
At reactor
inlet and outlet
but inside
the catalyst
Akad4miai
con-
under high the
pellets
Kiad6,
Budapest
OSTROVSKII et al.: CAPILLARY CONDENSATION b o t h gas-phase actions
reactions
(in small pores)
Obviously,
(in large pores)
and liquid-phase
re-
occur.
this situation differs
significantly
in the model of partially wetted pellets
from that
[1,2] when the reagents
are both gaseous and liquid. Here, only a part of external surface is dry. PROBABILITY OF CAPILLARY CONDENSATION The estimates resulting that capillary condensation
from the Kelvin equation indicate is possible
in some refinery pro-
cesses. In h y d r o d e s u l f u r i z a t i o n
(HDS) and hydrodearomatization
(HDA) of jet fuels on Ni-Mo/AI203
all the pores less than 70
in radius are filled with liquid heavy kerosines.
This fraction
(boiling temperature
(TB = 140-
240 ~
T B = 220-240
and its partial pressure
densation occurs at 300
~
perature increases to 310 ~ filled with liquid. to 290 ~