The thixotropy of suspension, the rheological properties change with the increase of shear time, is a complicated rheological phenomenon. The shear thinning and the shear thickening phenomena, i.e ., positive thixotro...The thixotropy of suspension, the rheological properties change with the increase of shear time, is a complicated rheological phenomenon. The shear thinning and the shear thickening phenomena, i.e ., positive thixotropy and negative thixotropy, were observed respectively in the previous studies. Recently we found a novel thixotropic phenomenon, described as "complex thixotropy", during studying the thixotropic phenomenon of magnesium aluminum hydroxide montmorillonite suspension. The study of thixotropy of the aqueous suspension consisting of magnesium aluminum hydroxide(Mg Al MMH)possessing permanent positive and Kaolinite possessing permanent negative charges is reported. The suspensions studied may display a positive thixotropy and complex phenomenon successively in various Mg Al MMH/kaolinite ratios 0-0.16 examined. The effect of shear rate( D L)used in measuring viscosity on the thixotropy of the suspension was investigated, and the mechanism of the thixotropy was discussed.展开更多
Cloud point extraction(CPE) utilizing non-ionic surfactant TX114 was carried out to separate and concentrate di(2-ethyl hexyl) phosphoric acid(D2EHPA) in its dilute aqueous solution.The CPE process was facilitated at...Cloud point extraction(CPE) utilizing non-ionic surfactant TX114 was carried out to separate and concentrate di(2-ethyl hexyl) phosphoric acid(D2EHPA) in its dilute aqueous solution.The CPE process was facilitated at 45℃.The influence of TX114 concentration,D2EHPA concentration and solution acidity on the extraction efficiency was studied.The results showed that extraction efficiency increased with decreasing TX114 concentration and increasing D2EHPA concentration.Such unusual extraction behavior might be the result of the reverse-micelle coacervate phase,solublizing D2EHPA on the surface of micelle,and the influence of D2EHPA on the cloud point of TX114.展开更多
Cloud point extraction (CPE) utilizing polyoxyethylene 10 lauryl ether (C12E10) as the surfactant was carried out to separate and concentrate di(2-ethyl hexyl) phosphoric acid (D2EHPA) in its dilute aqueous solution.T...Cloud point extraction (CPE) utilizing polyoxyethylene 10 lauryl ether (C12E10) as the surfactant was carried out to separate and concentrate di(2-ethyl hexyl) phosphoric acid (D2EHPA) in its dilute aqueous solution.The CPE process was facilitated by decreasing the cloud point (CP) temperature of the solution with sodium sulfate.The influence of C12E10 concentration, settling temperature, pH value, and Ni2+ in the solution on the extraction efficiency (E) was studied.The results showed that extraction efficiency increased with the concentration of C12E10, temperature and pH value of the system.Trace Ni2+ in the solution has no obvious influence on extraction efficiency of D2EHPA when pH=7.00.Single-stage extraction efficiency larger than 85% has been obtained.展开更多
The equipment for surface tension measurement by the improved differential maximum bubble pressure method was built and tested.The surface tension of a binary mixture of p-xylene and acetic acid was measured over the ...The equipment for surface tension measurement by the improved differential maximum bubble pressure method was built and tested.The surface tension of a binary mixture of p-xylene and acetic acid was measured over the entire concentration range from 303.15 K to 343.15 K under atmospheric pressure.The experimental values were correlated with two methods.It is useful for PTA plant design.展开更多
Taking soil colloid and hydrated silica (quartz sand) as the experimental material, thecomparative study has been made on the kinetics of ion diffusion and ion exchange in chargedcolloid and charged coarse disperse sy...Taking soil colloid and hydrated silica (quartz sand) as the experimental material, thecomparative study has been made on the kinetics of ion diffusion and ion exchange in chargedcolloid and charged coarse disperse systems. The results showed that ion exchange kinetics in thetwo systems conform to the kinetic law of ion diffusion. Besides, through this comparative studyon the kinetics of ion exchange and ion diffusion, a method has been advanced theoretically toestimate the quantity of adsorbed ion that is located in the inner of the Helmholtz layer. As far ashydrated silica is concerned , there were about 33 per cent of the total adsorbed quantity of Mg2+that were located in the inner of the Helmholtz layer under the given experimental conditions, butfor soil colloid tlle pcrcentage was only 7.5.展开更多
文摘The thixotropy of suspension, the rheological properties change with the increase of shear time, is a complicated rheological phenomenon. The shear thinning and the shear thickening phenomena, i.e ., positive thixotropy and negative thixotropy, were observed respectively in the previous studies. Recently we found a novel thixotropic phenomenon, described as "complex thixotropy", during studying the thixotropic phenomenon of magnesium aluminum hydroxide montmorillonite suspension. The study of thixotropy of the aqueous suspension consisting of magnesium aluminum hydroxide(Mg Al MMH)possessing permanent positive and Kaolinite possessing permanent negative charges is reported. The suspensions studied may display a positive thixotropy and complex phenomenon successively in various Mg Al MMH/kaolinite ratios 0-0.16 examined. The effect of shear rate( D L)used in measuring viscosity on the thixotropy of the suspension was investigated, and the mechanism of the thixotropy was discussed.
文摘Cloud point extraction(CPE) utilizing non-ionic surfactant TX114 was carried out to separate and concentrate di(2-ethyl hexyl) phosphoric acid(D2EHPA) in its dilute aqueous solution.The CPE process was facilitated at 45℃.The influence of TX114 concentration,D2EHPA concentration and solution acidity on the extraction efficiency was studied.The results showed that extraction efficiency increased with decreasing TX114 concentration and increasing D2EHPA concentration.Such unusual extraction behavior might be the result of the reverse-micelle coacervate phase,solublizing D2EHPA on the surface of micelle,and the influence of D2EHPA on the cloud point of TX114.
文摘Cloud point extraction (CPE) utilizing polyoxyethylene 10 lauryl ether (C12E10) as the surfactant was carried out to separate and concentrate di(2-ethyl hexyl) phosphoric acid (D2EHPA) in its dilute aqueous solution.The CPE process was facilitated by decreasing the cloud point (CP) temperature of the solution with sodium sulfate.The influence of C12E10 concentration, settling temperature, pH value, and Ni2+ in the solution on the extraction efficiency (E) was studied.The results showed that extraction efficiency increased with the concentration of C12E10, temperature and pH value of the system.Trace Ni2+ in the solution has no obvious influence on extraction efficiency of D2EHPA when pH=7.00.Single-stage extraction efficiency larger than 85% has been obtained.
文摘The equipment for surface tension measurement by the improved differential maximum bubble pressure method was built and tested.The surface tension of a binary mixture of p-xylene and acetic acid was measured over the entire concentration range from 303.15 K to 343.15 K under atmospheric pressure.The experimental values were correlated with two methods.It is useful for PTA plant design.
文摘Taking soil colloid and hydrated silica (quartz sand) as the experimental material, thecomparative study has been made on the kinetics of ion diffusion and ion exchange in chargedcolloid and charged coarse disperse systems. The results showed that ion exchange kinetics in thetwo systems conform to the kinetic law of ion diffusion. Besides, through this comparative studyon the kinetics of ion exchange and ion diffusion, a method has been advanced theoretically toestimate the quantity of adsorbed ion that is located in the inner of the Helmholtz layer. As far ashydrated silica is concerned , there were about 33 per cent of the total adsorbed quantity of Mg2+that were located in the inner of the Helmholtz layer under the given experimental conditions, butfor soil colloid tlle pcrcentage was only 7.5.
