Abstract
The sulfonic containing polymer bead was synthesized using sodium p-styrenesulfonate (SSS) and N,N′-methylenebisacrylamide (MBA) through inverse suspension polymerization and evaluated as catalyst for esterification of of n-octanol and acrylic acid. The influence of some principal factors, such as combination dispersant, crosslink agent content, posttreatment methods, and porogen types, was investigated in detail. The results showed that the morphology and characteristics of polymer beads were controllable. The polymer beads with 20wt% crosslink agent showed the best catalysis ability achieving almost 96% esterification conversion at the first time and 80% after 5 cycles.
Highlights
Ester, as one of most important industrial chemicals, is commercially synthesized by esterification or transesterification usually employing strong mineral acid as catalyst, which could deteriorate the esterification product quality in some degree
Dispersant plays a key role in stabilization of polymerization system and subsequently influences the content of monomers in obtained polymer bead and its morphology
The ratio is decided by dispersant type, because different dispersant combination can lead to different sodium p-styrenesulfonate (SSS) content in aqueous solution drop to form polymer bead and further result in different S content in bead
Summary
As one of most important industrial chemicals, is commercially synthesized by esterification or transesterification usually employing strong mineral acid as catalyst, which could deteriorate the esterification product quality in some degree. Sert [11] studied three different ion exchange resins, Amberlyst 15, Amberlyst 131, and Dowex 50Wx-400, as catalyst for the esterification of acrylic acid and n-butanol. They investigated the effects of different variables, temperature, molar ratio of alcohol to acid, stirrer speed, and catalyst loading on the reaction rate and concluded that Amberlyst 131 is the most efficient catalyst giving the maximum conversion of acrylic acid. Styrene-divinylbenzene (St-DVB) copolymer bead was firstly synthesized in the 1960s by suspension polymerization and could be donated sulfonic group (SO3H) through sulfonation to form ion exchange resin [12]. The polymerization of sulfonic containing monomer would be a solution to overcome these problems and to prepare higher quality catalyst beads with good catalyzed ability, stability, and probability to adjust the morphology
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