DCS控制辅助优质生物质PDI精细化工业生产

DCS Control to Assist High-Quality Bio-Based PDI Fine Industrial Production

绿色生态材料的应用,是实现绿色化、低碳化化工生产的基础。以生物质为原料制取生物质聚氨酯产品来替代石油化工衍生物,不仅可以有效降低生产过程中的能源消耗,减少温室气体排放,同时也可提高塑料产品的生物降解性。通过将绿色化工、精细化工相结合,在国内率先建立了生物质五亚甲基二异氰酸酯(PDI)的中试级生产线,并对反应过程及主要参数进行了详细的记录。结果表明,在集散型控制系统(DCS)的精细操控下,经过光气化反应,PDI粗品的选择性可以达到95.03%。随后,进一步地控制精馏过程中的温度、回流量及采出量,最终精馏出优质的吨级PDI产品(产品选择性 > 99.50%)。克服了特种异氰酸酯产品依赖于进口的现状,实现了生物质异氰酸酯中试化生产的国产化。The application of green ecological materials is fundamental to achieving green and low-carbon chemical production. Using biomass as a raw material to produce bio-based polyurethane products instead of petroleum-derived chemicals can effectively reduce energy consumption, decrease greenhouse gas emissions (especially carbon dioxide emissions), and improve the biodegradability of plastic products. By combining green chemistry with fine chemistry, we have established China’s first pilot-scale production line for biomass pentamethylene diisocyanate (PDI). The reaction process phenomena and main parameters were recorded in detail. The results showed that under the control of a distributed control system (DCS), the purity of PDI crude product could reach 95.03% after thermo photogasification reaction. Subsequently, further refinement was carried out to control the temperature, reflux rate, and extraction amount during the distillation process, resulting in the successful distillation of high-quality ton grade PDI products (product selectivity > 99.50%). We have overcome the dependence on imports for special isocyanates and achieved the localization of pilot production of bio-based isocyanates.