Polymer/Chromium Chloride Gel Sample Clauses

Polymer/Chromium Chloride Gel. Two sets of reactions and kinetics for polymer/chromium chloride gel are implemented in UTCHEM. The first is in-situ gelation of polymer with sodium dichromate with reducing agent thiourea, and the second is the gelation of Cr(III) with polymer to form gel. The kinetics for the reaction between polymer and chromium have been generalized to allow for any exponent (Xxxx, 1987). The gel is formed by fast reaction of trivalent chromium (Cr(III)) and polymer. There is an option for the slow delaying reaction between Cr(VI) and thiourea. The sodium dichromate (Na2Cr2O7) and thiourea (CS(NH2))2 are treated like tracers in the sense that they do not occupy any volume. The Cr(III) for the gelation process can be generated in situ by redox reaction between Cr(VI) and thiourea. Cr2O 2 − + 6CS( NH2 )2 + 8H+ —— k— 1— → 2 Cr3+ + 3[CS( NH2 )2 ]2 + 7H 2O The gel reaction is highly dependent on pH (Xxxxxxxx, 1992; Xxxxxxx and Xxxxxx, 1991). For more realistic simulations of gel reactions, pH was implemented in the gel kinetic equation as hydrogen ion concentration.
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