1070-4272/03/7603-0396$25.00C2003 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 76, No. 3, 2003, pp. 396!398. Translated from Zhurnal Prikladnoi Khimii, Vol. 76, No. 3,
2003, pp. 411! 413.
Original Russian Text Copyright + 2003 by Tadzhikhodzhaev.
AND CORROSION PROTECTION OF METALS
Manufacture of Corrosion Inhibitors
from Secondary Raw Materials
Z. A. Tadzhikhodzhaev
Institute of Chemical Engineering, Tashkent, Uzbekistan
Received March 28, 2002
Abstract-Metal corrosion inhibitors based on secondary raw materials from chemical and by-product coke
plants are developed and their inhibiting properties are studied in acid and hydrogen sulfide-containing
Wide range of inhibitors are known, as both in-
dividual compounds and various formulations. How-
ever, inhibitors currently used are based mostly on
reagent-grade components, which, naturally, is re-
flected in their cost.
In view of increasing demand for special inhibitors,
it appears advisable to use secondary raw materials
(process wastes, by-products, still bottoms, etc.) for
their manufacture .
It is quite reasonable to expect that the use of sec-
ondary raw materials for manufacture of acid and hy-
drogen sulfide corrosion inhibitors not only should
exert a significant influence on progress in many
branches of the industry, but it will also allow con-
siderable process advancement, eliminating many
power- and labor-consuming operations and thus
reducing the production cost. Of course, manufacture
of corrosion inhibitors from secondary raw materials
is advantageous from the environmental standpoint
also. In this work we studied new inhibitors for metal
protection against acid and hydrogen sulfide corrosion,
based on by-products from caprolactam production.
As starting materials for preparation of corrosion
inhibitors we used toluene and cyclohexane oxidation
products, T-product [5, 6] and Pod oil [TU (Technical
Specifications) 113-03-476382] , respectively.
Inhibitor I was prepared as follows. A mixture of
T-product and still bottoms of isoquinoline (IsSB)
was heated to 60oC, and epichlorohydrin (ECH) was
added using a dropping funnel. The reaction mixture
was heated at 1003110oC for 536 h. Then 5% aque-
ous NaOH was added, and the mixture was allowed to
stand at 100oC for 1 h.
Inhibitor II was obtained similarly using Pod oil
and still bottoms of higher pyridinium bases (HPBSB)
as starting products.
Inhibitor I was tested in the dynamic mode at 20,
40, and 60oC with stratal water [8, 9] of the Kras-
noyarsk oil field (Zhigulevskneft’ Oil-and-Gas Pro-
duction Department), containing 3333408 mg l
drogen sulfide. The inhibitor concentration c
varied from 100 to 400 mg l
. In blank experiments,
the corrosion of the same material (St. 3 steel) was
studied without inhibitor.
The inhibiting characteristics of inhibitor I are given
in Table 1 for the optimal component ratio (T-prod-
Table 1. Protective characteristics of inhibitor I with
respect to St. 3 steel in hydrogen sulfide-containing
³Protective action, %, at indicated temperature, oC
³ 20 ³ 40 ³ 60
100 ³ 90.2 ³ 86.2 ³ 82.4
200 ³ 94.4 ³ 92.8 ³ 91.2
300 ³ 96.4 ³ 93.2 ³ 92.8
400 ³ 96.6 ³ 93.4 ³ 92.8
100 ³ 27.2 ³ 25.0 ³Not determined
200 ³ 30.0 ³ 28.2 ³ "
300 ³ 49.8 ³ 48.6 ³ "
400 ³ 56.4 ³ 55.4 ³ "
* For optimal composition.