Minimization of chromium discharge in leather processing by using methanesulfonic acid : A cleaner pickling-masking-chrome tanning system / Chunxiao Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 12 (12/2016)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXI, N° 12 (12/2016) . - p. 435-446 Titre : Minimization of chromium discharge in leather processing by using methanesulfonic acid : A cleaner pickling-masking-chrome tanning system Type de document : texte imprimé Auteurs : Chunxiao Zhang, Auteur ; Fuming Xia, Auteur ; Biyu Peng, Auteur ; Qing Shi, Auteur ; Dominic Cheung, Auteur ; Yongbin Ye, Auteur Année de publication : 2016 Article en page(s) : p. 435-446 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chrome Déchets -- Réduction Méthane sulfonique, Acide Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chrome tanning is the most important and widely used tanning method in leather manufacture hitherto. However, chromium discharge may be a serious environmental concerned pollutant in leather processing, which originates from both chrome tanning and post-tanning operations. In order to minimize the emissions of chromium from the whole leather processing, a novel leather processing method integrating high chromium exhaustion and low chromium leaching-out based on the application of methanesulfonic acid (MSA) was designed and optimized. The results indicated that, being superior to the conventional processes, the chrome tanning and retanning processes with MSA were conducted at a high beginning pH (5.0) smoothly and the total chromium utilization ratio was increased to 95.8% from 81.0% in the novel processes. Accordingly, the total Cr dosage was decreased by 26.7% around, the residual Cr concentrations in each chrome-containing wastewater was decreased by 44%-85%, varying with the operations, and the total Cr discharge generated in the whole leather processing was reduced by 83.8% around, from 2.737 kg/t salted-wet hide to 0.443kg/t salted-wet hide before next chrome precipitation treatment. The area yields, mechanical properties and organoleptic properties of the leather from the new method were comparable with that from conventional processes. Note de contenu : - EXPERIMENTALS : Materials and instruments - Evaluation of the masking effect of MSA to chromium ion - Substituting sulfuric acid and/or formic/acid with MSA in pickling - Optimization of processing parameters of MSA pickling-chrome tanning - Tracing chrome discharge in whole leather wet-end processing based on MSA pickling-chrome tanning - Determination of chromium concentration in spent tanning liquors - Determination of chromium content and distribution in leather - Scanning electron microscopy (SEM) analysis - Test of physical and mechanical properties of crust leather - RESULTS AND DISCUSSIONS : The masking effect of methanesulfonic acid (MSA) on chromium ions - The influence of pickling with MSA on chrome tanning - Optimizing of parameters of MSA pickling-chrome tanning process - Tracing chrome discharge in whole leather wet-end processing - Comparison of leather properties - The pilot-scale experiment results En ligne : https://drive.google.com/file/d/1gNoNdHgN2wW3tDNPTY8ThH6Ngnrcr0Jd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27325 [article]

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