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№3/2021 year.
Technical science and innovation
56
The residual concentration of the nitrogen-containing component of the complex reagent
SNPKh-PKD-515N in the filtrate was only 0.7-1.6% of the originally introduced amount (0.05-
0.10%) into the artificially prepared solution.
In the study of the phase permeabilities of a hydrocarbon liquid (kerosene) and water after
filtration through a sandy bulk core of the drilling mud filtrate treated with the addition of 2%
SNPKh-PKD-515 (515H) and NaCl solution (ρ=1120 kg/m
3
) with the addition of 0.3% of
complex surfactants, it was found that greater efficiency was achieved when processing with
modified saline solutions. The phase permeability of kerosene after the filtrates of the bentonite
suspension recovered by 1.3%, and the PKD-515 solution - by 3.9% (i.e., 3 times more) and with
PKD-515N - by 7.8%, while in in the latter case, the relative water permeability decreased to
33%. The degree of recovery of the phase permeability of kerosene after brine with PKD-515
reached 25% and with an increase in the volume of pumping the solution increased to 32%. In
turn, the phase permeability of water decreased from 50 to 44%. Treatment of the terrigenous
reservoir with NaCl+PKD-515H solution made it possible to achieve a high degree of recovery
of kerosene permeability ~ 66%.
Analysis of literature data shows that the active component of industrial corrosion
inhibitors are nitrogen-containing heterocyclic compounds, among which imidosiline and its
derivatives occupy a special place.
The main raw material for the synthesis of imidazoline is ethylenediamine. 1,2-
Ethylenediamine (EDA) is also used in the petrochemical industry for the production of dyes,
emulsifiers, latex stabilizers, antioxidant additives for motor oils, plasticizers and fungicides.
EDA treatment with chloroacetic acid makes it possible to obtain ethylenediaminetetraacetic
acid, the salts of which are used as softening agents in the manufacture of textiles [26, 27].
There are two industrial methods for producing EDA [28]: from dichloroethane and
ammonia and from monoethanolamine (catalytic method). The first makes it possible to obtain
EDA with a high molecular weight using available feedstock. However, in the process of
synthesis, a significant amount of production wastes is formed, which makes its operation
inconvenient for environmental reasons. The waste of contaminated table salt alone is 400 kg per
1 ton of finished product. These drawbacks are devoid of catalytic methods for the synthesis of
ethylene amines, which, in turn, can be divided into 2 types: with the use of dehydration
catalysts; using catalysts for hydrogenating amination. What they have in common is that the
synthesis of ethylene amines from monoethanolamine (or a mixture of ethanolamines) and
ammonia is carried out on catalysts that are alumina, clay or aluminosilicates, on which an active
base is applied - phosphorus compounds, carbonates, etc. The disadvantage of these methods is
the need to carry out the process at high temperatures of 250 - 400°C, a pressure of 35 - 21.0
atm. Such harsh synthesis conditions lead to hydrogenolysis (destructive processes) of the
reaction products, resinification of the catalyst, complicates the composition of the reaction
mixture and its subsequent separation into target products: EDA, DETA, etc.
In much milder conditions, processes are carried out using catalysts for hydrogenating
amination. Thus, the American company Jefferson Cftemical Co. has developed a method for
obtaining linear EDA, in particular DETA, by amination of monoethanolamine (MEA) with
ethylenediamine. The process is carried out in the presence of a nickel-copper-chromium
catalyst. The process of Union Carbide Corp is similar, which consists in imitating a mixture of
ethanolamines (with a monoethanolamine content up to 70 wt. %) with liquid ammonia on a
catalyst consisting of nickel, cobalt, iron and copper. The maximum achieved selectivity of the
process with respect to EDA (based on the converted MEA 29.8%) is 78.3 wt. %, and for DETA
7.2 wt. %. The developments in the direction of obtaining linear EDA were carried out by the
German enterprise Lena Werke Walter Ulbrlcht.
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