摘要:

Water from water-in-crude oil emulsions is separated by chemical demul-sification. Coalescence rates of water droplets have been studied in the presence of a demulsifier. Droplet size measurement was carried out by photomicrography. Fastest coalescence rate was observed during first one minute. Binary coalescence time during this period was 5·4 seconds when 50 mg/1 of demulsifier was added and 4·2 seconds in the presence of 100 mg/1 of demulsifier.

ISSN:0193-2691    

DOI:10.1080/01932699408943549

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Synergism,β in two separate surfactant mixtures of sodium dodecylsulphate(SDS)/sodium octanoatet(NaC8) and tetradecyltri-methyl ammonium bromide(TTAB)/cetyltrimethylammonium bromide (CTAB) system were calculated and contrasted with the theoretical value at critical micelle concentration, cmc.

ISSN:0193-2691    

DOI:10.1080/01932699408943550

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Adsorption isotherms of β-lactoglobulin (p-LG) and acetylated β-lactoglobulin (Ac-β-LG). at the alumina/water interface are compared at pH value in the range 3·7 to 9·0.The isotherms of both modified and unmodified β-LG show highly pH-dependent behaviour. Both proteins showed the highest adsorption at pH 5·1. The greatest contrast between β-LG and Ac-β-LG occurred at pH 3·7 and 4·2 where β-LG showed positive adsorption and Ac-β-LG showed highly negative adsorption at the alumina/water interface. Aggregation of proteins leads to higher adsorption at pH Above pH 5·1, adsorption decreased to almost zero for both β-LG and Ac-β-LG, but on further increasing the pH to 9·0, adsorption becomes positive again. These results were related to the aggregation / dissociation property of β-LG in the entire pH range.

ISSN:0193-2691    

DOI:10.1080/01932699408943551

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

A study has been made of the influence of physical factors such as temperature, agitation time and shear rate upon the rheological behaviour of hydrogels composed of 2·5% microcrystalline cellulose -sodium carboxymethyl cellulose (Avicel RC 591(r), American Viscose Div., FMC Corp.) and different percentages of corn starch (0-3% by weight, w/w).

ISSN:0193-2691    

DOI:10.1080/01932699408943552

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Considering coal-water slurries (CWS) as dispersed systems with a large separation surface, we have studied the adsorption of same species at the solid-liquid interface; these species have been necessary for the preparation and stabilization of coal-water-slurries (CWS). In this paper, we report the results of the study on the adsorption of poly-naphthalene sulphonates (PNS) and poly-styrene sulphonates (PSS) with controlled molecular weight and steric purity, at model coal/water interfaces and at the real coal/water once

ISSN:0193-2691    

DOI:10.1080/01932699408943553

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

ISSN:0193-2691    

DOI:10.1080/01932699408943554

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The isoelectric points for niobium and vanadium pentoxide were determined through electrophoretic measurements and the experimental results were compared with three alternative procedures to predict this parameter. Experimental and predicted results show good agreement for Nb2O5that presents a well defined value for the isoelectric point but they do not correlate well in the case of V2O5that present a rather high solubility in the isoelectric pH region.

ISSN:0193-2691    

DOI:10.1080/01932699408943555

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor