Published by De Gruyter

Volume 41 Issue 5

Issue of Tenside Surfactants Detergents

Contents
Journal Overview

Contents/Inhalt

May 5, 2013

Page range: 211-211

Abstracts

May 5, 2013

Abstracts

Page range: 212-213

Application

May 5, 2013

Gypsum Scale Formation on Heat Exchanger Surfaces: The Influence of Natural and Synthetic Polyelectrolytes

Z. Amjad

Page range: 214-219

Abstract

The precipitation and deposition of calcium sulfate dihydrate (gypsum) on brass heat exchanger surfaces from aqueous solutions has been studied using a highly reproducible technique. It has been found that gypsum scale formation takes place directly on the surface of the heat exchanger without any bulk or spontaneous precipitation in the reaction cell. A variety of natural and synthetic polyelctrolytes such as fulvic acid, tannic acid, poly-(acrylic acid) and acrylic acid — based copolymers containing sulfonic group(s) have been examined for their effects on the rate of scale formation. The results indicate that the amount of gypsum scale formed on heat exchanger surface is strongly affected by polyelectrolyte architecture and concentration of polyelectrolyte. Scanning electron microscopic investigations of gypsum crystals grown in the presence of polyelectrolytes (natural and synthetic) show that structures of these crystals are highly modified.

May 5, 2013

Oilfield Applications of Anionic Alkylpolyglucosides

William M. McGregor, Dario Fornara, Tullio Pellizzon

Page range: 220-224

Abstract

In conventional detergent compositions, synergism between alkylpolyglucosides and conventional anionic surfactants is exploited. Now improved types of binary mixture of alkylpolyglucoside with innovative alkylpolyglucoside ester based anionic surfactant have been successfully applied to wellbore cleaning for the oil and gas industry. In recent years the environmental aspects of wellbore cleaning agents has become critical in environmentally sensitive areas since in offshore operations where there can potentially be accidental contamination of the marine environment with surfactants. Binary mixtures of alkylpolyglucosides and alkylpolyglucoside-based anionic surfactants showed the cleaning performance required, combined with the advantage of outstanding environmental properties.

May 5, 2013

Dynamic Interfacial Behavior of Decyl Methylnaphthalene Sulfonate Surfactants for Enhanced Oil Recovery

Zhongkui Zhao, Yan Ba, Zonghsi Li, Weihong Qiao, Lübai Cheng

Page range: 225-229

Abstract

The high purity decyl methylnaphthalene sulfonate (DMNS) was synthesized, the purity was determined by HPLC and the structure was confirmed by IR, UV and ESI-MS. Dynamic interfacial tensions (DIT) between DMNS flooding systems and crude oil were measured and the effects of sodium carbonate concentration, surfactant concentration and sodium chloride concentration on the DIT behaviors were investigated. It's found that the surfactant concentration, alkali concentration and the salinity have obvious influences on DIT behaviors. DMNS possessed outstanding capacity and efficiency of lowering the DIT between oil and water. The minimum dynamic interfacial tension could reach 6.35×10 −6 mNm −1 at a lowconcentration for added surfactant. DMNS might be used in Enhanced Oil Recovery with lowcosts and high efficiency.

GDCH Special Group Meeting

May 5, 2013

Mesoscale Computer Simulations on the Phase Behavior of the Non-Ionic Surfactant C12E5

S. G. Schulz, U. Frieske, H. Kuhn, G. Schmid, F. Müller, C. Mund, J. Venzmer

Page range: 230-234

Abstract

Dissipative Particle Dynamics is a mesoscopic simulation method which allows to predict the self-assembly of amphiphilic polymers and surfactants. It was possible to reproduce the phase behavior of the non-ionic surfactant C12E5 in water. The three different phases L 1 , L a and L 2 could be characterized with Dissipative Particle Dynamics.

Physical Chemistry

May 5, 2013

Structure-Activity Relationships for Sorption of Alkyl Trimethyl Ammonium Compounds on Activated Sludge

M. T. García, E. Campos, J. Sánchez-Leal, F. Comelles

Page range: 235-239

Abstract

Association of quaternary ammonium based surfactants with activated sludge from wastewater treatment plants has been studied. Adsorption isotherms on activated sludge particles and surface properties of a series of alkyl trimethyl ammonium compounds have been investigated. The effect of alkyl chain length and the water hardness in those physical-chemical properties have been evaluated. Adsorption on sludge increased with increasing the alkyl chain length in the cationic surfactant molecule. Linear relationships between critical micelle concentration (-log CMC) and efficiency of adsorption at the liquid/gas interface (pC 20 ), and the number of carbon atoms in the alkyl chain length were found for the alkyl trimethyl ammonium compounds. Water hardness decreased the CMC values of the tested alkyl trimethyl ammonium homologues and the extent of their sorption to activated sludge. Langmuir and Freundlich adsorption isotherms described satisfactorily the equilibrium adsorption of the cationic surfactants on activated sludge.

Technical Chemistry

May 5, 2013

Design Criteria, Mechanical Features, Advantages and Performances of Multitube Falling Film Sulphonation Reactor

Icilio Adami

Page range: 240-245

Abstract

Anionic Surfactants, and Sulphonates in particular, will continue to keep their important rule in Detergents formulation for generations to come. The sulphonation Reactor is the key-tool to generate Sulphonated Molecules for Detergent application, therefore the efforts in improving the specific technology are focused on the best possible design and search for optimum operation of the same. The limits of the present technology are discussed and the peculiarity and advantages of the latest generation of Multi Tube Falling Film Reactor are valued by highlighting: Design basis Construction accuracy Operating conditions and savings Achievable products quality

About this journal

Tenside Surfactants Detergents offers the most recent results of research and development in all fields of surfactant chemistry, such as: synthesis, analysis, physicochemical properties, new types of surfactants, progress in production processes, application-related problems and environmental behavior. Since 1964 Tenside Surfactants Detergents offers strictly peer-reviewed, high-quality articles by renowned specialists around the world.
All articles are subject to thorough, independent peer review.
Tenside Surfactants Detergents is the organ of the German Chemical Society (GDCh e.V.), Division "Chemie des Waschens".

Objective
Tenside Surfactants Detergents (TSD) publishes scientific manuscripts covering all aspects of chemistry, physics and application technology of surface-active substances (surfactants). The journal is aimed at scientists from industry, universities and research institutes who are actively involved in research work.

Topics

Physical chemistry of surfactants and surfactant mixtures in solutions and at interfaces
Analytical chemistry and synthesis of surfactants
Development of surfactants with special properties
Production of surfactants from renewable/microbiological resources
Novel "Green" Surfactants/Biosurfactants
Foams, Gels, Emulsions, Microemulsions
Application of surfactants in cleaning and body-care products, in pharmaceutical dosage forms, in agrochemicals and enhanced oil recovery
Development of sustainable cleaning products and cleaning techniques
Cleaning product safety and toxicology
Hygiene requirements for cleaning and personal care products
Consumer behavior in household cleaning
Development of cleaning products performance test methods

Subjects

Surfactant Chemistry
Colloid and Interface chemistry
Surface Chemistry
Textile chemistry
Environmental Chemistry
Detergent and Cleaning Agent Production

Article formats
Original Research Papers, Review Articles, and Short Communications