Temperature and pH effects on the hydrolisis of commercial polyphosphates used in the Liritan process / W. M. Fowler in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXI (Année 1986)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXI (Année 1986) . - p. 356-368 Titre : Temperature and pH effects on the hydrolisis of commercial polyphosphates used in the Liritan process Type de document : texte imprimé Auteurs : W. M. Fowler, Auteur ; I. H. Kruger, Auteur Année de publication : 1986 Article en page(s) : p. 356-368 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Polyphosphate pretanning is a part of the Liritan system of vegetable tanning. The effects of temperature and pH on the average chain length of solutions of two commercially used polyphosphates were studied. Thirty commercially available polyphosphates were analysed to determine their pH, total P2O5 content and average chain length (n). These are important factors which influence phosphate pretanning within Liritan process since they affect the subsequent vegetable tanning operation. Hydrolysis of the phosphate polymer causes a reduction in its chain length and it was found that both high temperatures and low pH conditions increased the rate at which polyphosphates were hydrolysed. The survey of commercial sodium hexametaphosphates showed there were only small variations in pH values but a wide range was found in the average chain length which varied from n = 6.9 to 21.2. En ligne : https://drive.google.com/file/d/1VKUFa25MngayntAdTLQ-pB7WaS-HW6Q5/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9218 [article]

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The extraction and high performance liquid chromatography (HPLC) determination of TCMTB samples of treated wet blue / W. M. Fowler in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. N° 71 (Année 1987)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. N° 71 (Année 1987) . - p. 100-107 Titre : The extraction and high performance liquid chromatography (HPLC) determination of TCMTB samples of treated wet blue Type de document : texte imprimé Auteurs : W. M. Fowler, Auteur ; Alan E. Russell, Auteur ; I. H. Kruger, Auteur ; S. C. Pinchuck, Auteur Année de publication : 1987 Article en page(s) : p. 100-107 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The efficiency of extracting 2-(thiocyanomethylthio) benzothiazole (TCMTB) with dichloromethand from treated wet blue samples was investigated and the high performance liquid chromatography (HPLC) method of determining the extracted TCMTB is described. Of the methods investigated, the most efficient procedure for TCMTB extraction was found to be sonication in boiling dichloromethane for 30 min followed by a 7.5 h soxhlet extraction. Using this method, TCMTB was extracted from wet blue treated at various concentration levels and containing different moisture contents. The amount of TCMTB increased with the amount offered during treatment, although not linearly. The amount extracted increased when the moisture content was lowered by sammying. The actual efficientcy of extraction method was determined in a mass balance experiment in which all masses and volumes were carefully monitored. The average extraction efficiency in treatments up to 0.25 % (m/m) fungicide offered in a 100 % float was 82 % of the total wet blue TCMTB content. An attempt was made to determine the ratio between the interstitial and the bound TCMTB which could have a bearing on the activity of the fungicide. After 30 days, less than 10 % of the TCMTB was present in the interstitial fluid. En ligne : https://drive.google.com/file/d/1t3tK8Y4oqZUftBT1PQKIqstUBSKGHBnB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9161 [article]

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