China Construction Installation Engineering Company Ltd

Nanjing, China

China Construction Installation Engineering Company Ltd

Nanjing, China

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Zeng X.,Zhejiang University | Zeng X.,Hunan University of Science and Technology | Zhan L.-T.,Zhejiang University | Zhong X.-L.,China Construction Installation Engineering Company Ltd | Chen Y.-M.,Zhejiang University
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | Year: 2016

Kaolin clay and chloride were selected as testing materials for the experimental study on the similitude of dispersion in low-permeability clay between centrifuge model and real prototype. Diffusion tests were firstly conducted to determine the relationship between the coefficient of effective diffusion and the void ratio. Then, soil column tests with different values of advection velocity were conducted at 1g and under centrifuge conditions (25g-50g) to obtain the relationship between the coefficient of hydrodynamic dispersion relative to free solution diffusion and Peclet number (Pe). Based on the experimental results, it is found that when Pe is defined based on dispersivity, the previously-reported critical Péclet number (Pe=1) can be used for judging similitude of centrifuge modeling ofdispersion in the Kaolin clay. When Pe is defined based on the mean particle size of the clay, the critical Péclet number is much less than 1. When the transport of non-reactive pollutant in a 2-m-thick low-permeability clay liner being subject to a hydraulic head less than 40 mis concerned, the difference between centrifuge modeling with an accelerationless than 100g and real prototype is less than 24%. © 2016, Zhejiang University Press. All right reserved.


Chen H.,Zhejiang University | Luo N.-Z.,China Construction Installation Engineering Company Ltd | Shen J.,Zhejiang University | Xiang X.-G.,China Construction Installation Engineering Company Ltd | And 3 more authors.
Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | Year: 2013

In this study, ethanol-water solution was used to leach flavonoids from the flower buds of Chrysanthemum indicum L, and the crude leaching-out products were purified by liquid-liquid extraction. In the leaching process, the influences of ethanol concentration, ratio of solid to liquid, temperature, leaching time and leaching times on yield of the total flavonoids were investigated; while in the liquid-liquid extraction process, a suitable extractant was chosen and the influences of feed concentration, phase ratio and extraction times on the yield of the total flavonoids and purity were studied. It turns out that the suitable conditions are as follows: 1) leaching process: ethanol-water (7:3, v/v) as leaching solution, temperature of 60°C, ratio of solid to liquid of 20:1 mL · g-1, leaching time of 1 hour, leaching times of one; 2) extraction process: temperature of 25°C, extractant of water-saturated n-butanol, feed concentration of 15 g · L-1, phase ratio of 1 and extraction times of three. Under the above conditions, the purity of total flavonoids in the extract after liquid-liquid extraction is 32.4%. Furthermore, it was found that the purities of extracts obtained at the second and third times of extraction are higher than 60%, thus these extracts can be used as raw material for the further separation and purification of flavonoid monomer.


Huang J.,Zhejiang University | Luo N.-Z.,China Construction Installation Engineering Company Ltd | Shen J.,Zhejiang University | Xiang X.-G.,China Construction Installation Engineering Company Ltd | And 4 more authors.
Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | Year: 2013

The initial concentration of glucosamine hydrochloride product prepared via acidic hydrolysis is only approximately 3%(wt). The conventional purification method is recrystallization, which requires high-energy consumption. Therefore, developing an energy-efficient process is of great significance. In this paper, an ion-exchange extraction process was investigated by using sodium di-(2-ethylhexyl) phosphate (D2EHPNa) of industrial grade as the extractant and kerosene of industrial grade as the diluent. The effects of the initial concentrations of D2EHPNa and NaCl, temperature and pH of the aqueous solution on distribution coefficient were studied. The results indicate that the distribution coefficient decreases with the increase of initial concentration of NaCl, increases with the increase of the initial concentration of D2EHPNa and temperature, and decreases with decrease of pH. In addition, the back extraction by concentrated hydrochloric acid was investigated according to the pH swing effect, and the extractant was regenerated after back extraction.

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