- Fatty alkyl dimethyl benzyl quaternary ammonium salt synthesis method
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The invention discloses a fatty alkyl dimethyl benzyl quaternary ammonium salt preparation method, which comprises: carrying out a salt formation reaction on fatty alkyl dimethyl tertiary amine and abenzyl halide in an organic solvent at a temperature of 30-70 DEG C, wherein R in the fatty alkyl tertiary amine is C6H13-C22H45, the halogen in the benzyl halide is chlorine, bromine or iodine, and the organic solvent is one or a plurality of materials selected from methanol, ethanol, n-propanol, isopropanol, acetone and acetonitrile. According to the present invention, the yield of the preparation method is high, and can reach more than 90%; the purity is high, and can achieve more than 99%; the water content is low; the product has good appearance and simple post-treatment effect; and the method can reduce the energy consumption, and is suitable for industrial production.
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Paragraph 0035; 0036; 0070
(2019/04/26)
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- Synthetic method of aryl sulphobetaine in solvent-free system
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The invention relates to a synthetic method of aryl sulphobetaine in a solvent-free system. The method comprises the steps that alkyl dimethyl tertiary amine and benzyl chloride which are close to the stoichiometric ratio react to synthetize alkyl dimethyl benzyl ammonium chloride at a low temperature, under high-speed stirring of a planetary stirrer and dilution of dry air in the solvent-free system, alkyl dimethyl benzyl ammonium chloride is added into chlorosulfonic acid close to the stoichiometric ratio step by step for a reaction, and alkyl dimethyl benzyl sulphobetaine is obtained. According to the method, no solvent is needed, the production cost is low, a small amount of residual chlorosulfonic acid obtained after a solvent-free reaction can be recycled through high-speed centrifugation, and the yield of alkyl dimethyl benzyl sulphobetaine can reach 98% or above.
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Paragraph 0051; 0052
(2017/04/03)
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- Ionic liquids as modulators of fragrance release in consumer goods
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When organic esters or alcohols were dissolved in each of three novel ionic liquids (which have no effective vapour pressure), the vapour-liquid equilibria (as measured by infrared spectroscopy of the gas phase) revealed significant positive deviation from Raoult's law for a wide range of perfume raw materials. The addition of water amplified the repulsive effect of the ionic liquid matrix, and this was exemplified by a series of ternary phase diagrams.
- Ferrero Vallana, Federico M.,Girling, Ricardo P.,Nimal Gunaratne,Holland, Lynette A. M.,Mcnamee, Pauline M.,Seddon, Kenneth R.,Stonehouse, Jonathan R.,Todini, Oreste
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p. 9958 - 9967
(2016/12/07)
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- Interactions between biocide cationic agents and bacterial biofilms
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The resistance of bacterial biofilms to physical and chemical agents is attributed in the literature to various interconnected processes. The limitation of mass transfer alters the growth rate, and physiological changes in the bacteria in the film also appear. The present work describes an approach to determination of the mechanisms involved in the resistance of bacteria to quaternary ammonium compounds (benzalkonium chloride) according to the C-chain lengths of those compounds. For Pseudomonas aeruginosa CIP A 22, the level of resistance of the bacteria in the biofilm relative to that of planktonic bacteria increased with the C-chain length. For cells within the biofilm, the exopolysaccharide induced a characteristic increase in surface hydrophilicity. However, this hydrophilicity was eliminated by simple resuspension and washing. The sensitivity to quaternary ammonium compounds was restored to over 90%. Staphylococcus aureus CIP 53 154 had a very high level of resistance when it was in the biofilm form. A characteristic of bacteria from the biofilm was a reduction in the percent hydrophobicity, but the essential point is that this hydrophobicity was retained after the biofilm bacteria were resuspended and washed. The recovery of sensitivity was thus only partial. These results indicate that the factors involved in biofilm resistance to quaternary ammonium compounds vary according to the bacterial modifications induced by the formation of a biofilm. In the case of P. aeruginosa, we have underlined the involvement of the exopolysaccharide and particularly the three-dimensional structure (water channels). In the case of S. aureus, the role of the three-dimensional structure is limited and drastic physiological changes in the biofilm cells are more highly implicated in resistance.
- Campanac,Pineau,Payard,Baziard-Mouysset,Roques
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p. 1469 - 1474
(2007/10/03)
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- Quaternization reaction of some N,N-dimethylalkylamines with benzyl chloride
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The parameters which influence the quaternization reaction of some N,N-dimethylalkylamines of RN(CH3)2, type (R = octyl, decyl, dodecyl, tetradecyl and hexadecyl) with benzyl chloride were studied. By thermogravimetric analyses, the kinetic parameters, the reaction order, "n", and the activation energy, "Ea", of the thermal decomposition of the quaternary salts prepared in this study, were established.
- Avram, Ecaterina
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