Effect of starch particles on foam stability and dilational viscoelasticity of aqueous-foam

Aphron applications--a review of recent and current research.

Colloidal gas aphrons (CGAs), first described by Felix Sebba in his book Foams and Biliquid Foams–Aphrons in 1987, consist of a system of spherical microbubbles with diameters mostly above 25 µm and classified as kugelschaums (ball foam). They possess some colloidal properties and can be pumped at uniform rate through pipes and channels, much like liquids. Also, they have high stability due to very small size and thick surfactant shells. Research work published over the past two decades indicate effective applications of CGAs for clarification of particles and microorganisms, protein separation, gas and nutrient transfer and pollutant separation from water and soil matrices. In this review paper, the techniques for generating CGAs and their application to pollution abatement are discussed. Some mineral separation processes by CGA flotation have also been reviewed because of their relevance to contaminant removal processes. The CGAs were found to function on the principles of bubble entrained floc flotation, electrostatic and ionic interaction, diffusion of entrapped gas and hydrophobicity of the pollutant particles. Two tables have also been provided to present a comparative overview of the generation technologies and the effectiveness of pollution remediation techniques. c � 2012 Society of Chemical Industry

Application of colloidal gas aphrons for pollution remediation

A Novel Inhalable Form of Rifapentine

Simultaneous removal of NO and SO2 through a new wet recycling oxidation–reduction process utilizing micro-nano bubble gas–liquid dispersion system based on Na2SO3

Solvent extraction using organic solvents is an important technology for the purification of wet process phosphoric acid (WPA). In this study, the purification process of WPA, using a new type of solvent extraction system, cyclohexanol diluted in kerosene, was investigated. The equilibrium phase diagram of the system H3PO4H2Osolvent mixtures at 313.2K was obtained. The effects of extraction time, phosphoric acid concentration, cyclohexanol concentration, temperature, phase ratio on extraction efficiency were studied. The extracted species was shown to be 2H3PO4 · 2C6H12O. The extraction process of H3PO4 is exothermic and the enthalpy change, H, was obtained. Via a cross-current three-stage extraction, the solvent mixtures have a high efficiency for phosphoric acid purification from the actual industrial WPA with an H3PO4 extraction yield of 90.2% at room temperature. The study is capable of enriching theoretical foundation and technical guidance for the phosphoric acid purification process.

https://www.jstage.jst.go.jp/article/serdj/24/1/24_23/_pdf

Purification of Wet Process Phosphoric Acid by Solvent Extraction using Cyclohexanol

The invention relates to a method for preparing industrial grade and food grade phosphoric acid by decomposing low grade phosphate rocks with hydrochloric acid. The method comprises the following processing steps: (1) decomposing phosphate rock powder with hydrochloric acid; (2) extracting to remove iron; (3) preparing dilute phosphoric acid; (4) preparing industrial grade phosphoric acid; and (5) preparing food grade phosphoric acid. Food grade phosphoric acid can be prepared only by adding deep defluorination process on the basis of the preparation steps of industrial grade phosphoric acid. The deep defluorination process adopts vacuum steam stripping process and the processing conditions are as follows: the vacuum degree is 0.075-0.090MPa, and the temperature is 95-110 DEG C. Industrial grade phosphoric acid prepared by the method of the invention meets the super grade or first-class product standards of GB/T 2091-2008; and food grade phosphoric acid meets the standards of GB 3149-2004.

Method for preparing industrial grade and food grade phosphoric acid by decomposing low grade phosphate rocks with hydrochloric acid

Kinetic Rate Constant of Liquid Drainage from Colloidal Gas Aphrons

The invention relates to a co-production method of calcium sulfate whisker and phosphoric acid. The method comprises the following technical steps of: (1) acid-hydrolyzing phosphate rock powder by hydrochloric acid with the mass concentration of 15 to 26% or nitric acid with the mass concentration of 20 to 90%, filtering the acid-hydrolyzed slurry into the acid hydrolysis solution containing Ca2 ; (2) using the acid hydrolysis solution containing Ca2 and the sulfuric acid with the mass concentration of 20 to 90% as the raw materials, wherein the use level of the sulfuric acid is 100% of the needed theoretical amount of the sulfuric acid when the Ca2 in the acid hydrolysis solution and the sulfuric acid react completely, adding the sulfuric acid to the acid hydrolysis solution containing Ca under the stirring condition, reacting the sulfuric acid with the acid hydrolysis solution containing Ca2 at the normal pressure and at 50 to 90 DEG, filtering and separating the calcium sulfate whisker after the reaction is finished, and then washing and drying the calcium sulfate whisker; and (3) carrying out the counter-current extraction on the filtrate obtained in the step (2), wherein the extracted water phase is the phosphoric acid, and acid-hydrolyzing the phosphate rock powder by using the hydrochloric acid obtained by the counter-extraction of the soft water to the extracted organic phase which is separated in the counter-current extraction.

Jun Li

Papers

Purification of Wet Process Phosphoric Acid by Solvent Extraction using Cyclohexanol

Method for preparing industrial grade and food grade phosphoric acid by decomposing low grade phosphate rocks with hydrochloric acid

Kinetic Rate Constant of Liquid Drainage from Colloidal Gas Aphrons

Co-production method of calcium sulfate whisker and phosphoric acid

Crystal Growth, Structure and Morphology of Rifapentine Methanol Solvate