Table 1 Effect of temperature on the dynamic sulfur capacity of zinc absorbers t, °С
0
50 100
150
200
300
Dynamic capacity, %
ICI 32-4
16
16
18
27
41
68
ICI 75-1
34
45
54
64
72
84
At temperatures above 400°C, the capacities of both sorbents are practically the same.
As can be seen from the presented test results, the ICI-75-1 chemisorbent has significant
advantages at low temperatures. It is this sorbent that is used to purify associated petroleum gases
on offshore platforms in the North Sea.
It should be noted that, although chemisorbents based on oxides of zinc, copper, and
chromium have been produced by industry in many countries for decades, intensive research
continues, including those aimed at a deeper study of the mechanism and kinetics of chemisorption
of sulfur compounds [8-10].
It turned out, for example, that sulfurization of the absorber granule occurs according to the
“shrinking core” model (Fig. 1), i.e., there is a sharp boundary between the sulfurized outer layer
(bright areas) and the unreacted core (dark areas).
In [11; 12],
a fairly realistic model of the absorber layer operation is presented, taking into
account internal diffusion and the kinetics of the H
2
S reaction in a chemisorbent granule. This
makes it possible to create sorbents with new predetermined properties, for example, high capacity
at low temperatures, increased thermal stability, and the ability to regenerate multiple times. This
also made it possible to evaluate the dynamics of the absorber operation in the solid and gas phases.
Science and Education in Karakalpakstan. 2023 №2/1 ISSN 2181-9203 40
a
b
