Prajapat Amrutlal L, Gogate Parag R
Chemical Engineering Department, Institute of Chemical Technology, Matunga, Mumbai 400 019, India.
Chemical Engineering Department, Institute of Chemical Technology, Matunga, Mumbai 400 019, India.
Ultrason Sonochem. 2016 Jul;31:371-82. doi: 10.1016/j.ultsonch.2016.01.021. Epub 2016 Jan 21.
The present work deals with intensification of depolymerization of polyacrylamide (PAM) solution using hydrodynamic cavitation (HC) reactors based on a combination with hydrogen peroxide (H2O2), ozone (O3) and ultraviolet (UV) irradiation. Effect of inlet pressure in hydrodynamic cavitation reactor and power dissipation in the case of UV irradiation on the extent of viscosity reduction has been investigated. The combined approaches such as HC+UV, HC+O3, HC+H2O2, UV+H2O2 and UV+O3 have been subsequently investigated and found to be more efficient as compared to individual approaches. For the approach based on HC+UV+H2O2, the extent of viscosity reduction under the optimized conditions of HC (3 bar inlet pressure)+UV (8 W power)+H2O2 (0.2% loading) was 97.27% in 180 min whereas individual operations of HC (3 bar inlet pressure) and UV (8 W power) resulted in about 35.38% and 40.83% intrinsic viscosity reduction in 180 min respectively. In the case of HC (3 bar inlet pressure)+UV (8 W power)+ozone (400 mg/h flow rate) approach, the extent of viscosity reduction was 89.06% whereas individual processes of only ozone (400 mg/h flow rate), ozone (400 mg/h flow rate)+HC (3 bar inlet pressure) and ozone (400 mg/h flow rate)+UV (8 W power) resulted in lower extent of viscosity reduction as 50.34%, 60.65% and 75.31% respectively. The chemical structure of the treated PAM by all approaches was also characterized using FTIR (Fourier transform infrared) spectra and it was established that no significant chemical structure changes were obtained during the treatment. Overall, it can be said that the combination of HC+UV+H2O2 is an efficient approach for the depolymerization of PAM solution.
本研究工作涉及基于与过氧化氢（H₂O₂）、臭氧（O₃）和紫外线（UV）辐照相结合，利用水力空化（HC）反应器强化聚丙烯酰胺（PAM）溶液的解聚。研究了水力空化反应器中的入口压力以及紫外线辐照情况下的功率耗散对粘度降低程度的影响。随后研究了HC + UV、HC + O₃、HC + H₂O₂、UV + H₂O₂和UV + O₃等组合方法，发现与单独方法相比，这些组合方法效率更高。对于基于HC + UV + H₂O₂的方法，在HC（入口压力3 bar）+ UV（功率8 W）+ H₂O₂（负载量0.2%）的优化条件下，180分钟内粘度降低程度为97.27%，而单独的HC（入口压力3 bar）和UV（功率8 W）操作在180分钟内分别导致特性粘度降低约35.38%和40.83%。在HC（入口压力3 bar）+ UV（功率8 W）+臭氧（流速400 mg/h）方法中，粘度降低程度为89.06%，而仅臭氧（流速400 mg/h）、臭氧（流速400 mg/h）+ HC（入口压力3 bar）和臭氧（流速400 mg/h）+ UV（功率8 W）的单独过程导致的粘度降低程度较低，分别为50.34%、60.65%和75.31%。还使用傅里叶变换红外（FTIR）光谱对所有方法处理后的PAM化学结构进行了表征，结果表明在处理过程中未获得明显的化学结构变化。总体而言，可以说HC + UV + H₂O₂组合是PAM溶液解聚的一种有效方法。
