Journal
GREEN CHEMISTRY
Volume 19, Issue 9, Pages 2155-2163Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7gc00670e
Keywords
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Funding
- National Natural Science Foundation of China (Program of Mesoscale Mechanism and Regulation in Multiphase Reaction processes) [91334201]
- Tsinghua University Initiative Scientific Research Program [20151080361]
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We herein propose a highly efficient method for the synthesis of polyvinyl butyral (PVB), an important resin material used for laminated glass in vehicles. The condensation reaction between polyvinyl alcohol (PVA) and n-butanal was successfully implemented in a reaction system containing a membrane dispersion microreactor and an aging vessel reactor, allowing the energy costs associated with cooling and mixing of the reactant solutions to be reduced. Upon changing the original reactant from a PVA-butanal emulsion to a PVA-HCl solution, the microreactor system allowed the development of a new recycling technology for the reuse of HCl, water, and excess n-butanal present in the product solution. In addition, with the aid of a two-step n-butanal feeding method, the developed recycling technology resulted in a 98.7% n-butanal utilization ratio, while the consumption of HCl and water during the reaction process was reduced by 85.6%. These results indicate that our novel process represents a more environmentally friendly approach to the PVB synthesis.
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