Ultra low temperature sono assisted co2 stripping in solvent based postcombustion carbon capture process pccc

Abstract

Carbon dioxide emission from anthropogenic sources plays a major newlinerole in global warming and climate change. Conventional amine-based carbon newlinecapture is matured technology that has limitations on high-temperature use newlineimposed by solvent degradation and solvent loss during CO2 stripping/ newlineregenerating solvent. The present experimental investigation involves the newlineapplication of tank-type (bath-type) sonication for CO2 stripping from newlineaqueous carbon-rich 30wt% MEA solvent in a low temperature-controlled newlineenvironment, using ultrasonic frequencies of 25 kHz ,40 kHz and 58kHz newline(cavitation-dominant), 360 kHzand 470kHz (streaming-dominant), and 40/192 newlinekHz and 58/132 kHz dual-mode (combined phenomena). The results are newlineanalysed to understand the effects of lean carbon loading, CO2 stripping newlineefficiency, stripping rate, temperature profile, and energy demand. newlineAlmost all the tested low frequencies such as 25 kHz, 40 kHz and newline58 kHz, the lowest temperature 6 and 12oC case exhibits the maximum newlinestripping efficiency. To leverage the maximum sonication benefit, newlineexperiments should be conducted at a low temperature or with low vaporpressure newlinesolvents. Cavitation intensity is high at lower temperature, and this newlineresults in an increased stripping efficiency. In addition, increasing the newlinefrequency renders better CO2 stripping. A maximum stripping efficiency of newline19.5% and 19.7% was observed for 40 kHz and 58 kHz frequency at low newlinetemperature 6°C in the tested low frequencies. The stripping rate of 3 to newline3.2×10-6 kg/s is higher in the low-temperature range of 6°C and 12°C for all newlinethe tested frequencies due to the sonication effect. An increase in the reaction newlinetemperature allows cavitation to be achieved at lower acoustic intensity, newlineyielding a diminishing sono-effect. The temperature is also not high enough to newlineprovide an additive effect. newline