Contrastive Studies of Coal between Direct Ultrasonic Extraction and Soxhlet Extraction
To compare the extraction rate of the organic components of coal between direct ultrasonic extraction and traditional soxhlet extraction, samples were selected from tectonic coal and original bituminous coal in Pingdingshan 8th coal mine and 5th coal mine. Compared the extraction time of two different extraction methods under the same extraction rate, the experimental results showed that the direct ultrasonic extraction rate was 3.6942% under the condition that coal was 8th coal mine tectonic coal, solvent was pyridine, extraction time was 6min and solvent volume was 60mL, while soxhlet extraction time was 14.59h in the same extraction rate. The extraction efficiency of the direct ultrasonic extraction was 145.9 times that of the soxhlet extraction. The ultrasonic extraction was a simplify working with fast extraction speed, sample capacity, energy saving, economy and environmental friendly. It also didn’t require heating which could avoid the influence of high-temperature on components extracted.
Zhong Cao, Yinghe He, Lixian Sun and Xueqiang Cao
H. Yang et al., "Contrastive Studies of Coal between Direct Ultrasonic Extraction and Soxhlet Extraction", Advanced Materials Research, Vols. 236-238, pp. 616-621, 2011