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À propos de : Development of an Ultra-rapid Reactor for Superabsorbent Polymer        

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  • Development of an Ultra-rapid Reactor for Superabsorbent Polymer
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  • Superabsorbent polymers are obtained by the polymerization of acrylic acid and its salts.Industrial processes for the production of superabsorbent polymers require many labor- andcapital-intensive steps in several vessels. This paper presents a new process that synthesizessuperabsorbent polymer in a single vessel, a modified spray dryer. Very fast polymerization isobtained with appropriate reactants and initiators, selected from 150 different combinations.Preheating and using the heat of neutralization of the acrylic acid greatly accelerate polymerization. A new, ultra-rapid reactor quickly mixes two streams of reactants and initiators to providefine droplets of polymerizing liquid. A two-stage mixer provides the best results: two flat jets ofliquids are first impacted at high velocity, and a high velocity gas jet is applied to the resultingliquid stream to form a spray of fine droplets and enhance drying. The compact reactor is locatedwithin the inlet region of a standard spray dryer that can deliver dry particles of superabsorbent.Preliminary experiments in a modified pilot-plant spray dryer gave superabsorbent polymerwith a conversion rate higher than 65%.
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