高分子ラテックス凝固粒子中の中和反応速度

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  • Study of the neutralization rate in a coagulation particle made by the seed coagulation method from polymer latex.
  • コウブンシ ラテックス ギョウコ リュウシチュウ ノ チュウワ ハンノウ ソク

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The neutralization rate of fatty acid to calcium fatty acid in a coagulation particle using calcium hydroxide solution was studied. The coagulation particles were made by the seed coagulation method, using hydrochloric acid solution as the coagulant.<BR>The following results were obtained.<BR>(1) A model of the neutralization rate in a particle was proposed, based upon the unreacted core model in which the rate-controlling step was the diffusion of the hydroxyl ion in a particle.<BR>(2) To design the neutralization reactor, relation between the conversion X [-] and time t [s] can be simulated when the hydroxyl ion diffusion coefficient D [m2·s-1] is obtained in neutralizing experiments, using the following equation provided that the model density of fatty acid ρ [mol·kg-1], radius of particle R [m] and neutralizing condition pOH are given.<BR>t=ρR2· {3-3 (1-X) 2/3-2X} /6·10POH·D<BR>In this study, the hydroxyl ion diffusion coefficient D was 2.91×10-8 m2·s-1 at 358 K.

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