The effect of impeller speed on the air flow in a selfaerated Denver laboratory flotation cell was investigated using computational modelling. Air is induced into the slurry by the impeller’s rotating action. The rate of air flow is determined by the suction pressure created by the impeller, the hydrostatic head of the slurry and the frictional losses along the delivery shaft from the inlet val...

Separation of proteins from whey; namely α – Lactoglobulin and β – Lactalbumin was obtained using the bubble foam column technique. Two types of whey were conducted in this study; yogurt whey and cheese whey. The effect of gas flow-rate and the height of the whey (liquid holdup) inside the column were studied at room temperature and at constant pH of whey. Whey used here obtained from local dai...

This paper describes the results of an experimental and modelling study on hydrodynamics of MellapakPlus packing operated under counter-current gas-liquid flow. The experimental work was focused on measuring the pressure drop, liquid holdup and capacity limit of this packing at specific liquid loads of up to 80 m/m/h. Experimental results for the air/water system confirm that MellapakPlus packi...

A low-pressure plasma surface treatment of polymeric powders was carried out in a circulating fluidized bed (CFB) reactor (10 mm-I.D. × 800 mm-high) with CF4 glow discharge. The effects of solid circulation rate, treatment time and radio frequency (rf) power of plasma on fluorination of high-density polyethylene (HDPE) powders have been determined. X-ray photoelectron spectroscopy (XPS) and the...

Bubble column reactors are used in a wide variety of applications such as multiphase bioreactors, catalytic slurry reactors, and absorption processes. The superficial gas velocity-gas holdup relationship and transition point are two important parameters for characterizing the hydrodynamics of a bubble column reactor. In this study, systematic investigation of a nitrogen - water - glass bead...

Chemical enhanced oil recovery (EOR) methods are alternatives to increase production in mature reservoirs. However, the presence of EOR chemicals produced water may impact separation gas-water systems platforms. The present work aims evaluate polymers, surfactants, inorganic salts, and their interactions on gas holdup a 32.1-cm-diameter semi-batch bubble column over range superficial velocities...

Abstract What drives investment in automation technologies? This paper documents a positive relationship between labor-friendly institutions and industrial robots sample of advanced developing economies. Institutions explain substantial share cross-country variation automation. The is stronger sunk cost-intensive industries, where producers are vulnerable to holdup. result suggests that one rea...