Lu K.,Hebei University of Technology |
Li R.,Hebei University of Technology |
Wu Z.,Hebei University of Technology |
Hou K.,Hebei University of Technology |
And 2 more authors.
Separation and Purification Technology | Year: 2013
A novel and structurally simple foam separation column with the cross internal was developed for investigating the effect of the column wall on the drainage of rising foam, using sodium dodecyl sulfate (SDS) as a foam agent. The cross internal enhances significantly wall effect due to an increase of wall contact area in the foam phase. Furthermore, the performances of foam separation column with the cross internal were assessed using crystal violet (CV) as the model system and SDS as the collector. The insertion of the cross internal significantly decreased the liquid holdup of the foam out of the column and increased the bubble size. The results showed that an increase in wall contact area in the foam phase could enhance the drainage of rising foam due to the higher drainage velocity between the bubbles and the column wall than that between the adjacent bubbles. Under the suitable operations conditions, the enrichment ratio of CV was 16.5 by using the column with the cross internal and it was nearly four times higher than the column without the cross internal. The better performances indicated that an increase of wall contact area in the foam phase is a simple and effective method to enhance foam drainage and improve enrichment of foam separation. © 2013 Elsevier B.V. All rights reserved.
Wang J.,Tianjin Polytechnic University |
Xu J.,China Tianchen Engineering Corporation |
Meng X.,Tianjin University |
Huang Y.,Tianjin University
Materials Research Bulletin | Year: 2014
Nanolamellar Fe3O4 (magnetite) (NLM) was synthesized by template method. The repeat periodicity of the 2-dimensional nanolamellar structure was 3.72 nm. NLM exhibited a superparamagnetic characteristic with the saturated magnetization 34.8 emu/g. The results showed NLM possessed properties of novel microwave absorption in the frequency range 1-18 GHz. An obvious multiple-reflection loss phenomenon was observed with the increase of matching thickness. For example, 8 reflection loss peaks could be found on the reflection loss curve of NLM/paraffin composite with 50 wt.% NLM at the thickness of 28.0 mm. Compared with NLM/paraffin composite with 75 wt.% NLM, the microwave absorption property of the composite with 50 wt.% NLM was confirmed to be inferior in the 1-10 mm thickness range but superior in the 10-30 mm thickness range. The lowest reflectivity was -46.6 dB obtained from NLM/paraffin composite with 75 wt.% NLM at 7.0 mm thickness. The NLM is a promising microwave absorber. © 2013 Elsevier Ltd. All rights reserved.
Qi J.,Tianjin University |
Lv W.,Tianjin University |
Lv W.,China Tianchen Engineering Corporation |
Zhang G.,Tianjin University |
And 3 more authors.
Nanoscale | Year: 2013
We have successfully developed a unique graphene-based smart catalytic system which consists of the graphene supported Au-Pt bimetallic nanocatalyst with a well-defined core-shell structure and a dextran-based temperature-responsive polymer. The unique catalytic system possesses excellent catalytic performances and the catalytic activities could be readily switched on or off at different temperature windows. © 2013 The Royal Society of Chemistry.
Chen S.-H.,China Tianchen Engineering Corporation
Xiandai Huagong/Modern Chemical Industry | Year: 2013
The principle, process flow and technology features of two kinds of nitrogen producing processes of PSA and cryogenic separation, are introduced. The technology features, investment, land area, etc., are compared comprehensively. The application principle of two kinds of technology is pointed out in the end.
Sun Q.,China University of Petroleum - Beijing |
Chen G.,China Tianchen Engineering Corporation |
Guo X.,China University of Petroleum - Beijing |
Liu A.,China University of Petroleum - Beijing
Fluid Phase Equilibria | Year: 2014
Hydrate separation technology has been widely applied to the separation of various gas mixtures with its own unique advantages over the past several decades. However, so far the relevant studies seem to be elementary and exploratory, and most of the separation processes are batch-type and not appropriate of practical uses. To promote the development of hydrate separation technology and to realize its industrial application early, we systematically investigated the continuous separation of CH4-N2, CH4-H2 and CO2-N2 gases respectively by hydrate method using 6mol% tetrahydrofuran (THF) solution as the liquid medium in this work. The results demonstrate that the continuous process of sequential hydrate formation and dissociation can be achieved in the presence of THF under appropriate temperatures and pressures, and the gas mixtures can be separated to some extent after liquid absorption and hydration reaction. The continuous separation process in this work provides an achievable approach for the application of hydrate separation method. © 2013 Elsevier B.V.