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Process Characteristics and Rheological Properties of Free Radical Polymerization in Microreactors
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-08-01 , DOI: 10.1021/acs.iecr.8b02314 Yang Song 1 , Minjing Shang 1 , Hong Zhang 1 , Wenhua Xu 1 , Xin Pu 1 , Qinghua Lu 1 , Yuanhai Su 1, 2
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-08-01 , DOI: 10.1021/acs.iecr.8b02314 Yang Song 1 , Minjing Shang 1 , Hong Zhang 1 , Wenhua Xu 1 , Xin Pu 1 , Qinghua Lu 1 , Yuanhai Su 1, 2
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Process characteristics of nonliving free radical polymerization of acrylamide in capillary microreactors were investigated at high temperatures (70–90 °C). Poly(acrylamide) with Mn of 3.4 × 105 g·mol−1 and polydispersity index of 2.6 could be obtained with 1.61 min residence time at 70 °C. The reaction mixture viscosity increased significantly during polymerization resulting in high pressure drops in microreactors. The reaction mixture changed from Newtonian fluid to non-Newtonian fluid with the polymerization processing. Furthermore, the rheological test indicated that hydrogels were produced in this polymerization process. Reynolds number and Bodenstein number were calculated to evaluate flow behaviors in microreactors. Low values of Re and Bo indicated strictly laminar flow and obvious deviations from plug flow in capillary microreactors during the polymerization. On the basis of pressure drop measurement, the energy balance calculation was conducted to assess the energy consumption during the polymerization. Moreover, the polymerization performance in the microreactor was compared with that in the batch reactor.
中文翻译：
微反应器中自由基聚合的过程特征和流变性质
在高温（70–90°C）下，对毛细管微反应器中丙烯酰胺的非活性自由基聚合的过程特征进行了研究。在70℃下1.61分钟的停留时间下，可以得到M n为3.4×10 5 g·mol -1且多分散指数为2.6的聚丙烯酰胺。在聚合过程中，反应混合物的粘度显着增加，导致微反应器中的高压降。随着聚合处理，反应混合物从牛顿流体变为非牛顿流体。此外，流变性测试表明在该聚合过程中产生了水凝胶。计算雷诺数和博登斯坦数以评估微反应器中的流动行为。低值Re和Bo表示在聚合过程中毛细管微反应器中的层流严格且与塞流有明显偏差。基于压降测量，进行能量平衡计算以评估聚合过程中的能量消耗。此外，将微反应器中的聚合性能与间歇反应器中的聚合性能进行了比较。
更新日期：2018-08-01
中文翻译：
微反应器中自由基聚合的过程特征和流变性质
在高温（70–90°C）下，对毛细管微反应器中丙烯酰胺的非活性自由基聚合的过程特征进行了研究。在70℃下1.61分钟的停留时间下，可以得到M n为3.4×10 5 g·mol -1且多分散指数为2.6的聚丙烯酰胺。在聚合过程中，反应混合物的粘度显着增加，导致微反应器中的高压降。随着聚合处理，反应混合物从牛顿流体变为非牛顿流体。此外，流变性测试表明在该聚合过程中产生了水凝胶。计算雷诺数和博登斯坦数以评估微反应器中的流动行为。低值Re和Bo表示在聚合过程中毛细管微反应器中的层流严格且与塞流有明显偏差。基于压降测量，进行能量平衡计算以评估聚合过程中的能量消耗。此外，将微反应器中的聚合性能与间歇反应器中的聚合性能进行了比较。
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