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Sergey M. Butrim, Tatiana D. Bilʼdyukevich, Natalia S. Butrim, Vladimir V. Litvyak
Obtaining
and studying the properties of highly substituted cross-linking with sodium
trimetaphosphate cationic starches of various botanical origin
Abstract
Abstract. Regularities have
been investigated and a method has been developed for one-stage cationization
and cross-linking of potato and corn starches using sodium trimetaphosphate as
a cross-linking agent. It was found that the obtained crosslinked cationic
starches retain their granular structure, and the degree of crystallinity of
the samples, regardless of the temperature (20–45 °C), reaction time (24–96 h),
and the dose of the crosslinking agent (0,05–5,0%), is greatly reduced,
insignificantly. It was shown that in a one-stage process, the efficiency of
the starch phosphorylation reaction decreases with an increase in the
concentration of sodium trimetaphosphate in the system, while the efficiency of
the cationization reaction does not change. It was found that the rate of flocculation
of kaolin suspensions increases with an increase in the dose of flocculant for
all types of cationic starches. It has been shown that, regardless of the dose,
the maximum sedimentation rates of kaolin in model systems are observed when
using cross-linked cationic potato starch. The results obtained can be used to
develop a technology for producing biodegradable crosslinked cationic starches
with the aim of their further use in polymer flooding to increase oil recovery,
and also as effective flocculants for cleaning aqueous solutions as an
alternative to synthetic polyacrylamide derivatives.
Key words: starch,
cationization, cross-linking, sodium trimetaphosphate, viscosity, flocculation
Copyright (C) Chemistry Dept., Moscow State University, 2002
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