volume by volume concentration
2.Abstract: A continuity wave model is put forward for the dispersion processof liquid-liquid two-phase system,by coupling mass and momentum conservation equations of two-fluid model.The conditions that result in a dispersion choke and the weak instability of a dispersion process are derived from the model.The phenomena of catastrophic inversion and transitional inversion are explained.The effect of drop size distribution on the maximum volume concentration of a emulsion is predicted using the model.According to the theory herein,emulsion inversion is the regime transition of liquid-liquid system due to the instablity of a dispersion process.The effect of drop size distribution on the maximum volume concentration of a liquid-liquid emulsion only occurs in a certain range of Weber numbers.
3.The suface tension of N alky N,N,N trihydroxyethyl ammonium chloride (AEEC) synthesized and purified in this work was determined by drop volume method. It was found that the surface excessive concentration of AEEC was decreased with the increase of carbon number of the hydrophobic group.
4.The averaged mass concentration by High-Volume instrument and Anderson cascade are 177 μg m -3 and 123 μg m -3 respectively, and the difference has relation to different sampling time and instrument.
5.The effect of content of chemical association agent, the concentration of CaO/MgO,volume ratio, initial concentration of acetic acid in organic phase and in stripping phase on the recovery yield were measured by using Alamine 336 (in n-octanol-kerosene) as extractant. The back-extraction mechanism and concentration ratio of calcium to magnesium in stripping solution was discussed.
6.According to the design and operation experiences, the volume of a spray scrubber can be decided by SO_2 concentration at the entrance and the needed absorbing efficiency when the volume absorbing load is chosen in a recommended range.
7.The effectiveness of separation for particles with equal buoyant density by the method of equivolumetric sucrose gradient is higher than that of equal velocitysucrcse gradient with zonal rotors, Under conditions of 5℃, 20℃, initial concentrations of 5% (w/w) and 20% (w/w), sucrcse solution, particle density 1.33 (g/cm~3) and 1.89 (g/cm~3), respectivcly, the volume and the concentration of sucrose solution which are necessary in the method of equivolumetric sucrose gradient with the zonal rotor equipped on Hitachi RPZ48T, RPZ35 have been obtained and the way of preraration of the gradient solution made by pump (Hitachi DGP) programmed for density gradient has also been discussed in this paper.
8.An IPN hydrogel formed by polyvinyl alcohol and chitosan was synthesized and the effects of the mass ratio of polyvinyl alcohol and chitosan,the volume of acetum,and the concentration of crosslinker on swelling ration were studied.
9.The dimensionless equations are obtained by introducing stream function, using the control volume formulation. And the natural convection in a porous medium has been studied by numerical calculation including the flow field, temperature and concentration profiles. The effects of Rayleigh number Ra and Lewis number Le on heat and mass transfer of a porous medium have also been numerically studied.
10.A method to calculate quantitatively the adsorption volume or adsorption space of per mass of adsorbent derived from both the adsorbed molecule volume and the maximum adsorbance of a solute in an adsorption isotherm under a given experimential condition is presented firstly for a solid/liquid adsorption system of the solute in a dilute aqueous solution.This method is suitable for not only mono-layer adsorption,but also mani-layer adsorption and micelle adsorpion of surfactant constructed by hydrophile and lipophile groups.Therefore,the surface concentration of the adsorbate,CS, deduced from the adsorption volume is possessed of the meaning of true concentration,and the value of the patition coefficient of the adsorbate between solid and liquid phass,Pα, attained by the CS and the C,solution concentration of the adsorbate,can be accurate.The foregoing a set of calculations are presented for the solid-liquid adsorption systems consisted of the wool fiber and separately dodecyltrimethyl-ammonium bromide (DTAB) and hexadecyltrimethyl-ammonium bromide (CTAB) in this paper.This provides a strong basis for adsorption thermodynamic investigation of adsorbate.
