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Xing X.,Zhengzhou University | Xing X.,CAS Institute of Process Engineering | Liu R.,CAS Institute of Process Engineering | Wang Z.,Zhengzhou University | And 7 more authors.
Journal of Nanoscience and Nanotechnology | Year: 2013

The tri-component hybrid CdS nanorods (NRs)/Au nanoparticles (NPs)@polyoxometalate (POM) was successfully prepared by a facile, efficient and green method. The structural properties and component analysis were studied by Transmission electron microscopy (TEM), X-ray Diffraction (XRD) and UV-Vis spectra. The POMs sever as not only reductant and bridge molecules, but also as co-catalyst to play an important role in the photocatalytic process. The as-prepared nanohybrid shows obviously enhanced photocatalytic activity toward photocatalytic evolution of hydrogen. Copyright © 2013 American Scientific Publishers All rights reserved.

Cheng Z.,China University of Petroleum - East China | Li W.,Natural Gas Processing Plant | Xu D.,Natural Gas Processing Plant | Liang C.,Natural Gas Processing Plant
Petroleum Processing and Petrochemicals | Year: 2011

In order to solve the problem existing in the N-methyl pyrrolidone (NMP) extractive distillation system, such as reducing processing capacity, blocking of reboiler inlet tube, unstable operation and product quality, investigation on NMP extractant was carried out. It was found that compared with fresh NMP extractant the properties of used NMP extractant were changed including boiling range, pH value, color and some black coke-like deposits were formed. Tests of heating NMP extractant under air and pure nitrogen were carried out respectively, and the results showed that keeping NMP extractant away from air was a good way to prevent its degradation. Therefore, an air leak into the vacuum operation system during unit shutdown was the main cause for the changing of NMP extractant. Field application was conducted using natural gas as a protective gas to prevent NMP extractant contact with air during unit shutdown, since then the processing capacity of the unit increased almost 50% and the product quality was stable, which indicated that this anti-coking technology, i. e. using natural gas as a protective gas during unit shutdown, is feasible.

Cheng Z.-H.,Natural Gas Processing Plant
Xiandai Huagong/Modern Chemical Industry | Year: 2010

The natural gas treatment device of Zhongyuan Oilfield is a medium-pressure cryogenic light hydrocarbon recovery device. Owing to the low operating temperature at the top of demethaning column, blocking of frozen CO2 often occurred in demethaning column, thus great hidden danger to the smooth and safety operation of the device has been brought. This study is focused on the freeze blocking law with different CO2 content in raw natural gas and solutions to dissolve CO2 freeze blocking at the top of demethaning tower proposed by adding butane or other hydrocarbon substances.

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