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Comparative study of retanning properties of melamine-glyoxal resins produced by different sulfonating agents / Muhammad Naveed Ashraf in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 5 (09-10/2022)
[article]
Titre : Comparative study of retanning properties of melamine-glyoxal resins produced by different sulfonating agents Type de document : texte imprimé Auteurs : Muhammad Naveed Ashraf, Auteur ; Shahzad Maqsood Khan, Auteur ; Shahid Munir, Auteur ; Rashid Saleem, Auteur Année de publication : 2022 Article en page(s) : p. 205-214 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composés organiques -- Synthèse
Cuirs et peaux -- Propriétés mécaniques
Eaux usées -- Analyse
Etudes comparatives
Mélamine glyoxal
Retannage
Tannage synthétiqueIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Amino resins have many applications including leather retanning. Being condensation products of formaldehyde, amino resins are one of the sources of free formaldehyde in leather. ln this work novel glyoxylated melamine resins were produced to make formaldehyde-free leather. The optimised process of synthesis was used to produce stable resins which were able to polymerise further in situ at retanning pH conditions. Water solubility of the resins was achieved by using various aromatic sulfonating agents including, orthanilic acid (ONA), metanilic acid (MNA), sulfanilic acid (SNA) and aniline 2,5-disulfonic acid (ADS). Synthesised resins were used in leather retanning to evaluate their comparative mechanical properties, organoleptic properties, free formaldehyde content and SEM analysis. The effluent of each retanning bath was also analysed for pollution load studies. All the resins showed improvements in mechanical and organoleptic properties in comparison with a commercial melamine resin but, the novel resin MGSNA exhibited remarkable results.
Estimation of free formaldehyde content showed absence of free formaldehyde content in leather and retanning effluent of all the novel resins. Determination of COD, TDS and TSS of effluent confirmed a significant reduction in pollution load due to improved exhaustion of resins attributed to their in-situ polymerisation in collagen fibres to enhance their fixation.
SEM analysis of leather confirmed improvements in retanning results due to formation of more orderly arranged networks of collagen fibres. Moreover, the introduction of an aromatic ring in the resin structure resulted in improved thermal stability of the resins. The results indicate that this development is remarkable for production of formaldehyde-free leather with improved retanning properties along with reduction in water pollution. This work also addresses the carcinogenic effects of formaldehyde.Note de contenu : - EXPERIMENTAL PROCEDURE : Chemicals and apparatus - Synthesis of novel melamine-glyoxal resins
- RESULTS AND DISCUSSION : Synthesis of resins - Leather applications of various novel glyoxal based melamine resins - Mechanical properties of leather reatanned with glyoxal-based melamine resins - Orgnoleptic properties of the leather retanned with glyoxal-based melamine resins - SEM analysis - Quantitative estimation of free formaldehyde content in retanned leather - Thermogravimetric analysis - Effluent analysis - Structural elucidation
- Table 1 : Mole ratio and physical characteristics of prepared novel melamine resins
- Table 2 : Leather processing materials, conditions and recipe
- Table 3 : Mechanical properties of leather retanned with glyoxal based melamine resins
- Table 4 : Comparative study of effluent produced from retanning baths of synthesised resinsEn ligne : https://drive.google.com/file/d/1d731nM2Y_RzuR-xX0DT3EX7AtII9e3uS/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38195
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Code-barres Cote Support Localisation Section Disponibilité 23641 - Périodique Bibliothèque principale Documentaires Disponible Components of a bioflocculant prepared with bacillus subtilis for the treatment of tannery wastewater / Changqing Zhao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 4 (07-08/2015)
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Titre : Components of a bioflocculant prepared with bacillus subtilis for the treatment of tannery wastewater Type de document : texte imprimé Auteurs : Changqing Zhao, Auteur ; Zhao Xingxiu, Auteur ; Mu Shengdong, Auteur ; Gu Haibin, Auteur ; Zhang Jing, Auteur ; Wei Zou, Auteur ; Yang Qinhuan, Auteur Année de publication : 2015 Article en page(s) : p. 172-175 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bacillus subtilis
Eaux usées -- Analyse
Eaux usées -- Décontamination
Floculant
Fourier, Spectroscopie infrarouge à transformée de
TannageIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : A bioflocculant prepared with Bacillus subtilis was used to treat tannery wastewater, followed by component analysis of the bioflocculant. The restes demonstrated that the bioflocculant prepared with Bacillus subtilis was able to treat total nitrogen, chemical oxygen demand (COD) and colour, successfully removing the compounds from tannery wastewater. Component analysis revealed that the bioflocculant contained saccharides, proteins, glycoproteins, osamines, and fats ; the bioflocculant did not contain nucleic acid. It is expected that these results will contribute to future research into the application and the mechanism by which bioflocculants remove contaminants from tannery wastewater. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials
- PREPARATION OF BIOFLOCULANT
- TREATMENT OF TANNERY WASTEWATER BY FLOCCULANT : Component analysis of the bioflocculant - Observation of the bioflocculant by FT-IR
- RESULTS AND DISCUSSION : Treatment of tannery wastewater by bioflocculant (analysis of saccharide, protein, glycoprotein, osamine, fat and nucleic acid in the bioflocculant, analysis by FT-IR)En ligne : https://drive.google.com/file/d/1AiXp7mBGBH-6gBpWhSj0M5ldj-PLsEak/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24558
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Code-barres Cote Support Localisation Section Disponibilité 17358 - Périodique Bibliothèque principale Documentaires Disponible Construction of a chrome-free tanning system based on highly-oxidized starch–zirconium complexes / Yue Yu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 3 (03/2022)
[article]
Titre : Construction of a chrome-free tanning system based on highly-oxidized starch–zirconium complexes Type de document : texte imprimé Auteurs : Yue Yu, Auteur ; Hui Wang, Auteur ; Ya-Nan Wang, Auteur ; Jianfei Zhou, Auteur ; Bi Shi, Auteur Année de publication : 2022 Article en page(s) : p. 87-95 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Amidons
Biodégradation
Croûte (cuir)On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés.
Cuirs et peaux -- Propriétés physiques
Eaux usées -- Analyse
Granulométrie
Post-tannage
Taille des particules
Tannage chrome free
Tannage combinéLe tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en œuvre par exemple Chrome-Végétal ou Chrome-Synthétique
ZirconiumIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chrome-free leather manufacture is one of the major focuses of leather industry. In this work, a chrome-free tanning system based on highly-oxidized starch–zirconium complexes (HOS–Zr) was constructed. Particle size and charge properties analyses revealed that the small size (2.5 nm) and the low cationic species content (45.1%) of HOS–Zr at low pH facilitated its uniform penetration in leather at the initial stage of tanning, and the large size (89–169 nm) and the high cationic species content (77.5%) of HOS–Zr after basification contributed to its stable crosslinking between collagen fibers. A 3% HOS–Zr offer (based on the weight of ZrO2) imparted wet white with sufficient tanning effect. The physical properties of HOS–Zr crust leather were remarkably better than those of lactic acid–zirconium crust leather and were comparable to those of chrome crust leather. Wastewater in HOS–Zr tanning system showed a reduction in TOC load by 40.0% and higher biodegradability compared with chrome tanning system. As a result, this work provided a practical and sustainable approach to eliminate chrome in leather manufacture. Note de contenu : - EXPERIMENTAL : Materials - Optimization of HOS-Zr tanning system - Particle size analysis - Charge properties analysis - Tanning trials
- RESULTS AND DISCUSSION : Optimization of HOS-Zr-tanning system - Particle soze of HOS-Zr - Charge properties of Zr complexes - Comprehensive evaluation of the tanning performance of HOS-Zr
- Table 1 : La-Zr and HOS-Zr tanning process
- Table 2 : conventional chrome tanning process
- Table 3 : Post-tanning process
- Table 4 : Properties of tanned leathers
- Table 5 : Physical properties o fcrust leathers
- Table 6 : Pollution loads in tanning and post-tanning wastewaters (unit: kg/ton of pickled hide)
- Table 7 : Biodegradability of tanning and post-tanning wastewatersEn ligne : https://drive.google.com/file/d/1VmQIPtNQ6vZECS63DGWb4kMJcZEwDYNN/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37599
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Code-barres Cote Support Localisation Section Disponibilité 23402 - Périodique Bibliothèque principale Documentaires Disponible Contamination of used soak/unhairing baths by nitrogen in comparison with carbon and soluble protein contents in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 95, N° 1 (01-02/2011)
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Titre : Contamination of used soak/unhairing baths by nitrogen in comparison with carbon and soluble protein contents Type de document : texte imprimé Année de publication : 2011 Langues : Anglais (eng) Catégories : Azote
Bain de trempe
Carbone organique total
Eaux usées -- Analyse
ProtéinesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Contamination of used soak/unhairing baths by nitrogen in comparison with carbon and soluble protein contents --- The leather industry generates highly contaminating liquid effluents with current process methods. In this work, the contamination by nitrogen in wastewater was evaluated for two of the most nitrogen generating steps of beamhouse processing, the soaking and the unhairing/liming steps. Total Kjedahl nitrogen (TKN), ammoniacal nitrogen (N-NH3), total organic carbon (TOC) and soluble protein analyses were realized from bath samples collected at varying times. It was observed that in long duration soaking, nitrogen liberation to the bath eventaully levels out whilst, in unhairing/liming, the nitrogen content did not stabilize even with 27 hours processing.
It was possible to observe a relatioship between nitrogen liberation, TOC and soluble protein contents of the soaking baths.En ligne : https://drive.google.com/file/d/1DHV89FHygImMNUcR-fHJ6_yj7U5YCOB1/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10817
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Code-barres Cote Support Localisation Section Disponibilité 012825 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Des cuirs metal free Type de document : texte imprimé Auteurs : Thomas Cassenti, Auteur Année de publication : 2020 Article en page(s) : p. 16-19 Langues : Français (fre) Catégories : Cuirs et peaux d'agneaux
Cuirs et peaux de veaux
Eaux usées -- Analyse
Tannage chrome free
Tannage métal free
Température de retraitIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Un projet de recherche mené par CTC vise à mettre au point un tannage metal free. trois agents de tannage ont été testés. Les résultats présentés dans cet article sont centrés sur l'étape de tannage. Note de contenu : - Les différents tannages
- Un tannage sans métaux
- Bilan des essais de tannage
- FIGURES : Principe du tannage au chrome - Schéma réactionnel - Autopsie du produit A - Autopsie du produit B - Autopsie du produit C - Réaction entre le produit A et le collagène de la peau - Réaction entre le produit B et le collagène de la peau - Réaction entre le produit C et le collagène de la peau - Cuirs obtenus en fonction des différentes méthodes de tannage
- TABLEAUX : Mise en place des procédés (exemple de tannage sur peau d'agneaux) - Résultats des températures de rétraction sur des veaux et des agneaux - Résultat des analyses chimiques des effluents - Résultats de l'aspect visuel - Prise en mainEn ligne : https://drive.google.com/file/d/1LGXrNr9fjBUtVt4fw0dhtbFfWmFSU7Zz/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33361
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Code-barres Cote Support Localisation Section Disponibilité 21456 - Périodique Bibliothèque principale Documentaires Disponible 21455 - Périodique Bibliothèque principale Documentaires Disponible Deliming with weak acid-effects on leather quality and effluent / S. M. Colak in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 3 (05-06/2008)
PermalinkDetermination of chloride and sulphate ions in leather pickling liquor by low-pressure ion chromatography / Bo Li in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 1 (01-02/2004)
PermalinkDetermination of chromium(III) and chromium(VI) in water by low Pressure ion chromatography coupled with inductively coupled plasma-mass spectrometry / Jin Haochen in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 4 (07-08/2016)
PermalinkDetermination of surfactants in leather wastewater by flow injection spectrophotometry / Yuan Dong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 1 (01-02/2007)
PermalinkDetermination of the reactive dye navy blue her in the wastewaters of the dyeing processes of chrome-tanned leather / L. S. P. Santos in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 10 (10/2014)
PermalinkDetermination of volatile phenol in tannery effluent / Xie Yonghong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 1 (01-02/2008)
PermalinkDevelopment of a new leather intermediate : wet-bright with a high dye affinity / Anna Bacardit in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 3 (03/2016)
PermalinkDevelopment of a reagent kit for rapid determination of chromium (VI) / Ding Shaolan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 4 (07-08/2016)
PermalinkDirect spectrophotometric determination of formaldehyde in leather wastewater by flow injection analysis with chromotropic acid / Zou Yuquan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 4 (07-08/2007)
PermalinkEffect of argon atmospheric pressure plasma (APP) treatment on the properties of sheep leathers and wastewater of the retanning processes / Safiye Meric Acikel in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 104, N° 3 (05-06/2020)
PermalinkEffect of different unhairing methods on the ionic liquid based fiber opening process / Z. Mohammad Jamal Azhar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 6 (06/2016)
PermalinkEfficient and ecological leather processing : replacement of lime and sulphide with dispase assisted by 1-allyl-3-methylimidazolium chloride / Hui Liu in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 4 (Année 2022)
PermalinkEfficient removal of total nitrogen from tannery wastewater by promoting denitrification with sodium acetate / Ma Xiaojian in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 6 (11-12/2019)
PermalinkElectrochemical method for quantitative determination of trace amounts of disperse dye in wastewater / Daniela P. Santos in COLORATION TECHNOLOGY, Vol. 130, N° 1 (02/2014)
PermalinkEvaluation de la charge polluante des eaux résiduaires / Hélène Sanejouand / 1980
PermalinkEvaluation of chemical products in leather post-tanning process and their influence in presence of neutral salts in raw tannery effluent / M. V. Moreira in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 4 (04/2019)
PermalinkEvaluation of environmental impact of typical leather chemical. Part 1 : Biodegradability of fatliquors in activated sludge treatement in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 1 (01-02/2008)
PermalinkExploration of the diffusion, binding and crosslinking of chromium complex within hides during chrome tanning / Chunxiao Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 5 (05/2019)
PermalinkExploring the mechanisms of the interaction between a specific bioflocculant and tannery wastewater / Changqing Zhao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 2 (03-04/2018)
PermalinkA fast method for determination of sulfate in tannery waste waster / Xie Yonghong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 6 (11-12/2006)
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