Accueil
Catégories
Ajouter le résultat dans votre panier Affiner la recherche
Etendre la recherche sur niveau(x) vers le bas
An investigation of acetaldehyde release from leather introduced by chemicals / Chen yong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 4 (07-08/2022)
[article]
Titre : An investigation of acetaldehyde release from leather introduced by chemicals Type de document : texte imprimé Auteurs : Chen yong, Auteur ; He-Wei Ma, Auteur ; Luo Jian-Xun, Auteur Année de publication : 2022 Article en page(s) : p. 155-158 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alcools gras éthoxylés
Composés organiques
Cuirs et peaux -- Analyse
EthanalL'éthanal (Nomenclature IUPAC), aussi appelé acétaldéhyde, aldéhyde acétique, éthyl aldéhyde ou oxoéthane, est un composé chimique, un aldéhyde de formule chimique CH3CHO.
Naturellement produit par les plantes, c'est un composant volatil trouvé à faibles doses dans les fleurs et feuilles du coton, dans les feuilles de chêne et de tabac, dans les fruits mûrs, le café et le pain frais. Il contribue à l’odeur du romarin, des jonquilles, de l’orange amère, du camphre, du fenouil, de la moutarde et de la menthe. Il servait autrefois de matière première de base pour la synthèse de l’acide acétique et de l’anhydride acétique. Il est utilisé comme agent de sapidité dans certaines margarines. C'est un produit toxique et cancérigène suspecté.
L'éthanal est un liquide incolore, volatil et miscible à l'eau et à presque tous les solvants organiques.
L'odorat humain le perçoit à très faible dose (0,05 ppm suffisent) comme une odeur fruitée (pomme verte) et il devient suffocant et piquant à forte teneur.
Il est très réactif et inflammable (point d'ébullition: 20,2 °C). Il peut vivement réagir avec, par exemple, des oxydants, halogènes , ammoniac et amines, alcools, cétones, phénols, anhydrides d'acide, sulfure d'hydrogène, cyanures. En contact avec le cuivre ou des alliages en contenant (bronze, laiton, ...), il peut former des composés explosifs. Il ronge le caoutchouc.
Comme tous les aldéhydes, c'est un réducteur. Son oxydation, très facile puisqu'elle peut même se produire au contact de l'air, donne de l'acide acétique, de l'anhydride acétique et de l'acide peroxyacétique instable susceptible de spontanément exploser.
L'hydrogénation de l'éthanal donne de l'éthanol.
Trois molécules d'acétaldéhyde peuvent former un paraldéhyde cyclique. Quatre molécules d'acétaldéhyde peuvent former un tétramère d'acétaldéhyde cyclique, le métaldéhyde.
Ethoxylate d'alcool
Polyéthylène glycolIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The correlation of acetaldehyde release from leather with leather chemicals was evaluated through a test method based on purge-and-trap technique, and the trace-to-source of acetaldehyde in leather was investigated. The results indicated that occurrences of acetaldehyde in soaking auxiliaries and degreasing agents were significantly positive. The processed pelts with these auxiliaries gave obvious acetaldehyde contents when comparing with these produced by acetaldehyde-free chemicals. A further test on the ethoxylated compounds - fatty alcohol ethoxylates (AEO) and polyethylene glycol (PEG), which are the most common ingredients in auxiliaries, revealed that AEO and PEG with low degrees of polymerisation as AEO-3 and PEG200, comprised acetaldehyde in high concentration. It was concluded that some ethoxylated surfactants in leather chemicals could be one of the main sources of acetaldehyde in leather. Note de contenu : - EXPERIMENTAL PROCEDURES : Apparatus and materials - Sampling - Preparation of hide - Test of acetaldehyde - HPLC analysis
- RESULTS AND DISCUSSION : Acetaldehyde in leather chemicals - Acetaldehyde release from hide - Source of aldehyde in leather chemicals
- Table 1 : Contents of acetaldehyde release from hide peltEn ligne : https://drive.google.com/file/d/1Swm9C-J3NB6jxyCuTOe0OXD1ZGAmOxoM/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37878
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 4 (07-08/2022) . - p. 155-158[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 23539 - Périodique Bibliothèque principale Documentaires Disponible Benefits of the surfactant along the value chain / Christoph Söffing in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 204, N° 4603 (12/2014)
[article]
Titre : Benefits of the surfactant along the value chain Type de document : texte imprimé Auteurs : Christoph Söffing, Auteur Année de publication : 2014 Article en page(s) : p. 16-18 Langues : Anglais (eng) Catégories : Copolymère styrène acrylique
Emulsifiants
Ethoxylate d'alcool
Latex
Revêtement mural:Peinture murale
Revêtements en bâtiment:Peinture en bâtiment
Revêtements intérieurs:Peinture intérieure
Sulfate d'ammonium
Sulfate de sodiumLe sulfate de sodium est un composé chimique courant formé d'un ion sulfate et de deux ions sodium. Lorsqu'il est anhydre, il prend l'apparence d'un solide cristallin blanc de formule chimique Na2SO4. La forme déca-hydratée, Na2SO4·10H2O, est connue sous le nom de sel de Glauber ou mirabilite. Parmi un grand nombre d'usages différents, les principales utilisations du sulfate de sodium concernent la fabrication des détergents et dans le procédé de Kraft de traitement de la pâte à papier. La moitié environ de la production mondiale provient de l'extraction de la forme naturelle décahydratée, et l'autre moitié de productions secondaires dans des procédés de l'industrie chimique.
SurfactantsIndex. décimale : 667.9 Revêtements et enduits Résumé : Surfactants are surface active ingredients with multiple functionalities. They are used as emulsifiers, wetting agents, dispersants and detergent and/or foaming agents, in a variety of applications ranging from cosmetics and cleaners, to agrochemicals, adhesives and palots.
In order to offer a value-added solution to customers, the chemical industry must recommend the most appropriate surfactant to meet the requirements and challenges of both its immediate customers and their consumers. A good understanding of the value chain steps is, therefore, essential.
Clariant, a world leader in speciality chemicals, has decades of experience in developing surfactants for emulsion polymerisation. To support its customers in identifying the most appropriate emulsifier, it tested more than 25 different anionic and nonionic surfactants with improved environmental profiles (ie APEO-free, VOC-free, hazard label-free) against market standards such as ethoxylated [EO] alkyl ether sulphates and nonylphenol ethoxylates.
The objective was to understand the emulsifiers' contribution to a more efficient polymerisation process, to find the best emulsifier concentration to achieve top grade latex quality and to evaluate the performance of the obtained pigment binder in a formulated and tinted architectural paint.
To condense the ample screening test findings, this article features concrete exemples for sodium and ammonium sulphates (anionic emulsifier) and fatty alcohol ethoxylates (nonionic emulsifier) used in the production of styrene acrylic latex emulsions.Note de contenu : - Profiles of the selected surfactants
- Impact of the emulsifiers on particle size distribution & coagulum formation
- Impact of emulsifiers on latex quality
- Impact of emulsifiers in interior wall paintsEn ligne : https://drive.google.com/file/d/1d5CvwfJT14FEdbuwMuQIK-R7us4vveVI/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22666
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 204, N° 4603 (12/2014) . - p. 16-18[article]Réservation
Réserver ce document
Exemplaires (2)
Code-barres Cote Support Localisation Section Disponibilité 16741 - Périodique Bibliothèque principale Documentaires Disponible 16740 - Périodique Bibliothèque principale Documentaires Disponible Biodegradation of alcohol ethoxylates by bacterial consortium from industrial wastewater / Dorota Nowicka in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 50, N° 1 (01-02/2013)
[article]
Titre : Biodegradation of alcohol ethoxylates by bacterial consortium from industrial wastewater Type de document : texte imprimé Auteurs : Dorota Nowicka, Auteur ; Irena Budnik, Auteur ; Joanna Zembrzuska, Auteur Année de publication : 2013 Article en page(s) : p. 31-35 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bains de placage
Eaux usées -- Analyse
Ethoxylate d'alcool
Surfactants -- BiodégradationIndex. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Industrial waste water, can contain pollutions such as inorganic water-insoluble substances (in particular sewage from electroplating). In nature, the microorganisms play a special role in maintaining life on earth. The decomposition of organic compounds into simple minerals is the main link in the circulation of biogenic elements, especially carbon, nitrogen, phosphorus, sulfur and other. The aim of the study was to evaluate the biodegradability of a model nonionic surfactant and identification of metabolites generated in the process of biodegradation using microbial consortium originating from electroplating wastewater. Tested model nonionic surfactant C12E10 is a mixture of polydisperse homologues of C12Ex, C14Ex and C16Ex series. Alcohol ethoxylates were isolated by liquid-liquid extraction (LLE) using chloroform. Aliquot of the extract was evaporated and reconstituted in the mobile phase for further LC-MS analysis. Note de contenu : - MATERIALS AND METHODS : Reagents and chemicals - Sewage sample - Biodegradation studies
- RESULTS : Photometric test - Calculation of the number of bacteria using Thoma chamber - HPLC-MS analysisDOI : 10.3139/113.110228 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17147
in TENSIDE, SURFACTANTS, DETERGENTS > Vol. 50, N° 1 (01-02/2013) . - p. 31-35[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 14537 - Périodique Bibliothèque principale Documentaires Disponible Enhancing specialty surfactants bio-based content without sacrificing performances - Narrow range ethoxylates / Stuart Holt in SOFW JOURNAL, Vol. 145, N° 10 (10/2019)
[article]
Titre : Enhancing specialty surfactants bio-based content without sacrificing performances - Narrow range ethoxylates Type de document : texte imprimé Auteurs : Stuart Holt, Auteur Année de publication : 2019 Article en page(s) : p. 18-26 Langues : Anglais (eng) Catégories : Biomatériaux
Biosurfactants
Composés organiques -- Synthèse
Consommateurs -- Préférences
Ethoxylate d'alcool
Etudes comparatives
Produits nettoyants
Surfactants -- Aspect de l'environnementIndex. décimale : 668.5 Parfums et cosmétiques Résumé : The consumer attitude toward household cleaning products is changing. No longer are cost and performance the only considerations. The consumer is increasingly aware that they need to make careful selection of products, tending towards selection of natural, preferably vegetable-based ingredients that are sustainably sourced and which are mild in the environment once released post-use.
In this paper we will explore an example of how it is possible to increase the bio-based content of a class of specialty surfactants – narrow range ethoxylates, which have historically been of synthetic origin. By switching to a natural, vegetable-based hydrophobe, sourced via a sustainable supply chain (RSPO), we can better meet customer expectation, and will demonstrate that the same high performance of the cleaning ingredient can be fully maintained. In so doing, we provide formulators the option to develop more bio-based, high-performance cleaning formulations, with ingredients that also qualify as EU Ecolabel.Note de contenu : - Consumer drive for more sustainable cleaning - Supported by third party certifiers
- Non-detergent specialty alcohol ethoxylates - Historically from synthetic sources
- Narrow range ethoxylation - Providing consumer and formulator advantage
- Introducing NRE's with natural hydrophobes - RSPO-certified
- Comparison of synthetic vs.Natural NRE's - life-for-like performanceEn ligne : https://drive.google.com/file/d/1ytaOSK1ecOvNu5MJojmoRlyMSOQNWMG-/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33229
in SOFW JOURNAL > Vol. 145, N° 10 (10/2019) . - p. 18-26[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 21325 - Périodique Archives Documentaires Exclu du prêt Evaluation of Physico-Chemical interactions between linear alkylbenzene sulfonate (LAS) and alcohol ethoxylates / F. B. Malihi in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 5 (09-10/2011)
[article]
Titre : Evaluation of Physico-Chemical interactions between linear alkylbenzene sulfonate (LAS) and alcohol ethoxylates Type de document : texte imprimé Auteurs : F. B. Malihi, Auteur ; A. Khaani, Auteur ; N. Changizi, Auteur ; B. Adeeb, Auteur Année de publication : 2011 Article en page(s) : p. 395-399 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dynamique moléculaire
Ethoxylate d'alcool
Sulfonates d'alkylbenzène
SurfactantsIndex. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Linear alkylbenzene sulfonate (LAS) is the most widely used surfactant in household products. The dominance of LAS is particularly apparent in laundry detergents, dishwashing liquids, household cleaners, and institutional/industrial cleaners, where it accounts for over 3 million tons per year worldwide consumption. However, detergency performance of LAS is decreased in hard water due to lower solubility and surfactant loss in the presence of calcium and magnesium ions. In this study behavior of an aqueous binary surfactant mixture composed LAS and nonionic surfactants was investigated. Ethoxylated alcohols (C12– C14) with 7 EO and 2 EO units were mixed with LAS in laundry detergent formulations, and performance factors including detergency, solubility, and efficiency and effectiveness of surface tension reduction were examined. Analysis of surface tension data indicated strong molecular interaction between LAS and nonionic surfactant. The results indicated that the addition of low amounts of the nonionic surfactant lowers significantly CMC of the mixed surfactant system, and causes the formation of mixed micelles containing predominantly nonionic molecules which provide water hardness protection for LAS. The overall improvement in detergency appears to be due to: lower CMC of the mixed surfactant system which improves soil solubilization, solubilization of Ca(LAS)2, and reduction of free calcium ions which frees up soluble LAS in solution to adsorb at fabric-soil interfaces for enhanced soil removal. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12562
in TENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 5 (09-10/2011) . - p. 395-399[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 13302 - Périodique Bibliothèque principale Documentaires Disponible PermalinkImparting mildness with living tea plant ingredient / Michael Koganov in PERSONAL CARE EUROPE, Vol. 6, N° 5 (11/2013)
PermalinkNew developments, proven concepts and basic knowledge in professional ceaning and care / Tobias Kimmel in SOFW JOURNAL, Vol. 145, N° 11 (11/2019)
PermalinkSynergies of hydrophobic polymers and surfactants on surface activity and cleaning performance / M.-E. Chateau in SOFW JOURNAL, Vol. 133, N° 4 (04/2007)
PermalinkWashing wool with surfactants and a non-toxic solvent microemulsion : influence of water hardness / Francisco J. Carrión-Fité in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 50, N° 2 (03-04/2013)
Permalink