Kinetic studies of SBS catalytic hydrogenation with high selectivity

Mei Ming 1;Li Lei 1,*;Zhang Hong-xing2;

Journal of Beijing University of Chemical Technology ›› 2004, Vol. 31 ›› Issue (4) : 82-86.

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Journal of Beijing University of Chemical Technology ›› 2004, Vol. 31 ›› Issue (4) : 82-86.
研究论文

Kinetic studies of SBS catalytic hydrogenation with high selectivity

  • Mei Ming 1;Li Lei 1,*;Zhang Hong-xing2;
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Abstract

The kinetic behavior of hydrogenation of styrene butadiene styrene tri block copolymers (SBS, S/B=3/7,linear) using the bis (cyclopentadineyl) titanium dichloride (Cp2TiCl2) as a catalyst and dimethyl (o-) phthialate (DMP) as a cocatalyst was systematically studied. It was showed that the catalysts had a high activity and a high selectivity with phenyl not being hydrogenated. The kinetics equation of hydrogenation,which was obtained with proper concentrations of the catalyst and the cocatalyst at 76℃ and under proper H2 pressure,was -d[c(C=C) ]/dt =kc1 (C=C )p1.12 (H2 )c1 (Ti )c-2 (DMP), and the activation energy of hydrogenation between 70~84℃ wad 83.48KT/mol.The structure of the products were also studied by 1H-NMR specta.The result indicated that 1,2-PB inits and trans-1,4 PB units were hydrogenated prior to cis-1,4-PB inits,and were fully hydrogenated.

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Mei Ming 1;Li Lei 1,*;Zhang Hong-xing2;. Kinetic studies of SBS catalytic hydrogenation with high selectivity[J]. Journal of Beijing University of Chemical Technology, 2004, 31(4): 82-86

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