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Chen M.-Y.,Zhengzhou University | Chen M.-Y.,Henan Engineering Research Center for Subcritical Extraction | Pang H.-L.,Zhengzhou University | Pang H.-L.,Henan Engineering Research Center for Subcritical Extraction | And 6 more authors.
Wool Textile Journal | Year: 2015

Subcritical dry-cleaning technology is a washing mode that washes the wool fiber mildly and removes its surface stain and lanolin easily without water through the washing process by using subcritical dry-cleaning solvent. The present study dealted with the raw wool by using the subcritical dry-cleaning technology, with the help of analysis instruments as X-ray diffractometer (XRD), thermogravimetric analyzer (TG) and scanning electron microscope (SEM) to discuss the structure changes of wool fiber after different processing conditions, and compared with wool samples handled by common soap alkali cleaning. The results showed that lipid material in surface of wool scales dissolved to subcritical butane solvent under certain conditions. The observation of X-ray diffraction showed that fiber crystallization index was slightly higher than that of raw wool without further spread to fiber cortex after the processe of dry-cleaning. TG-DTG analysis showed that the thermal decomposition performance of subcritical treated sample was significantly higher compared with that process by soap alkali. Results of SEM showed that removal and hollow of wool scales was more and more obvious as the processing degree deepening.

Xu L.,Jinan University | Ye L.,Jinan University | Qiu R.,Jinan University | Qin G.,Henan Engineering Research Center for Subcritical Extraction | Huang X.,Jinan University
Journal of the Chinese Cereals and Oils Association | Year: 2015

In order to improve oil extraction rate of Macadamia nut, the Macadamia nut oil was extracted by subcritical butane, and the process parameters such as temperature, extraction time, the ratio of solid to liquid and the extraction times were optimized. The main physicochemical properties and fatty acid composition were also analyzed. An optimum oil extraction yield of 80.7% was extracted under condition that 1:5 g/mL subcritical butane at the temperature of 45℃ for 4 times, and 15 min each time. Comparing to the hot pressing, most of refining processes could be omitted by above extraction. The quality of the oil extracted was excellent with long oxidation induction time, and oleic acid(58.99%) and palmitoleic acid(17.59%) were the main unsaturated fatty acids(UFA) while palmitic acid(9.29%) and stearic acid (4.15%) were the main saturated fatty acids(SFA) present in the Macadamia nut oil. It was concluded from above results that the Macadamia nut oil extracted by subcritical butane was characterized by both lower operating temperature and better quality. ©, 2015, Editorial Department, Chinese Cereals and Oils Association. All right reserved.

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