Accueil
Catégories
Ajouter le résultat dans votre panier Affiner la recherche
Etendre la recherche sur niveau(x) vers le bas
Raw skin wastes - Used to prepare a collagen fibre adsorbent for the chromatographic separation of flavonoids / Zhang Qixian in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 3 (05-06/2014)
[article]
Titre : Raw skin wastes - Used to prepare a collagen fibre adsorbent for the chromatographic separation of flavonoids Type de document : texte imprimé Auteurs : Zhang Qixian, Auteur ; Li Xinxin, Auteur ; Li Juan, Auteur ; Wenhua Zhang, Auteur ; Xuepin Liao, Auteur ; Bi Shi, Auteur Année de publication : 2014 Article en page(s) : p. 93-98 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbants et adsorbants
Adsorption
Chromatographie
Collagène
Cuirs et peaux -- Déchets
Flavonoïdes
Gel de silice
Matériaux poreux
PolyamidesUn polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine.
Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères.
Séparation (technologie)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : To explore the new approach of value-added utilization of tannery skin wastes, a novel column packing material, collagen fibre adsorbent (CFA), was prepared by using skin wastes as raw material. In the present study, the separation application of CFA on flavonoids and its comparison with other current packing materials (silica gel, polyamide, D101 macroporous resin and Sephadex LH-20) were investigated. Rutin and kaempferol were selected as model flavonoids. Static adsorption indicated that the adsorption capacity of CFA to rutin and kaempferol was different, and the extent of adsorption of kaempferol was lower because it has fewer hydroxyl groups/hydrogen-bond reaction sites. In CFA column chromatography separation, the mixture of rutin and kaemoferol could be well separated by stepwise elution with 90% and 50% aqueous ethanol solutions, and their recoveries were 90.02% and 94.60%, respectively.
However, in comparison with CFA, rutin and kaempferol could not be well separated and recovered by using silica gel, polyamide and D101 macroporous resin columns. In addition, the cost of CFA is much lower, especially compared with Sephadex LH-20. Therefore, CFA has the potential to be applied as a packing material for separation of flavonoids.Note de contenu : - MATERIALS AND METHODS : Materials and equipments - Preparation of CFA - Static adsorption capability of CFA
- RESULTS AND DISCUSSION : Characterization of CFA by SEM analysis - Static adsorption capability of CFA - Chromatographic separation performance of CFA - Price estimation of CFAEn ligne : https://drive.google.com/file/d/1qDjmuTspuQTaf7gyPhUobxdXpL6fZ3gu/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21528
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 3 (05-06/2014) . - p. 93-98[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 16323 - Périodique Bibliothèque principale Documentaires Disponible Reducing chemical consumption and waste water COD loadings by recycling in conjunction with membrane filtration / K. Hellinger in WORLD LEATHER, Vol. 14, N° 7 (11/2001)
[article]
Titre : Reducing chemical consumption and waste water COD loadings by recycling in conjunction with membrane filtration Type de document : texte imprimé Auteurs : K. Hellinger, Auteur Année de publication : 2001 Article en page(s) : p. 37-41 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Déchets
Eaux usées -- Recyclage
Filtration
Membranes (technologie)
Produits chimiques -- Consommation -- Réduction
Séparation (technologie)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The production of high quality chrome-free leather is becoming of greater importance to leather users particularly in the auto and furniture sector. However, for the production of very soft chrome-free leathers higher amounts of fatliquor, vegetable and synthetic tans are required. These quantities are greater than needed for leathers made from wet blue, and exceed the amounts which can be bound by the leather. These non-bound materials therefore remain in the process liquors and give rise to high COD in the effluent.
A simple reduction in the offer of fats and retans to reduce this wastage does not solve the problem, as it leads to a deterioration of handle, softness and fullness. Wider introduction of leathers based on wet white therefore results in higher chemical costs, and increased effluent loadings and charges.Note de contenu : - Limiting factors in recycling
- Membrane separation techniques and applications
- Leather processing using membrane separation and float recycling
- Optimising recycling technology
- Economic and ecological findings
- Fig. 1 : Additions of fatliquor and retanning material added to wet white and wet blue based on shaved weight
- Fig. 2 : Analysis of mixed process liquors from processing
- Fig. 3 : Residual COD from various stages in the production of furniture upholstery leather from wet white
- Fig. 5 : Ultrafiltration of mixed floats from furniture and auto upholstery processing
- Fig. 6 : Model for recycling within retanning, fatliquoring and dyeing
- Fig. 7 : Ultrafiltration of the residual neutralisation/ retannage / fatliquoring float
- Fig. 8 : Technique used for recycling the retentate from the neutralising / retanning / fatliquoring stage
- Fig. 9 : Analysis of residual floats from multi-recycling
- Fig. 10 : Effect of recycling on fat distributionEn ligne : https://drive.google.com/file/d/1Zwebj4sXmkkmKXaKvVxH-Rk1kOujismq/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32184
in WORLD LEATHER > Vol. 14, N° 7 (11/2001) . - p. 37-41[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 006174 - Périodique Bibliothèque principale Documentaires Disponible Rheological behaviour of alkali solubilized collagen from limed bovine split wastes / Chen Yihui in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 97, N° 5 (09-10/2013)
[article]
Titre : Rheological behaviour of alkali solubilized collagen from limed bovine split wastes Type de document : texte imprimé Auteurs : Chen Yihui, Auteur ; Li Guoyin, Auteur ; Jia Yun, Auteur Année de publication : 2013 Article en page(s) : p. 195-199 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bases (chimie)
Collagène
Collagène -- Solubilité
Cuirs et peaux -- Déchets
Cuirs et peaux de veaux
Rhéologie
Rhéométrie
Solutions (chimie)
TempératureIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The rheological behaviour of alkali solubilized collagen solutions (ASCS) from calf limed splits was modeled to investigate the effects of temperatures (25, 27.5, 30 and 32.5°C) and concentration (8, 10 and 15mg/m1) on its fluid type using viscometrical rheometry. ASCS were reconstructed by using a power-law mode) and exhibited the typical pseudoplastic behaviour with flow behaviour index values, n<1. n increased with increasing concentration but decreased with increasing temperature. The dynamic viscoelastic properties of ASCS were determined by means of oscillatory rheometry at different pH, concentrations and temperatures in the ranges 2.5 to 8, 5-15mg/nnl and 25-35°C, respectively. The values of storage modulus (G'), loss modulus (G") and complex viscosity (?*) decreased with increasing pH from 2.5 to 7, and then increased as pH increased further. Meanwhile, G', G", ?* and relaxation times increased with the increase of collagen concentration, but decreased with increasing temperature and behaved without regularity at 35°C. Note de contenu : - EXPERIMENTAL METHODS : Preparation of ASC - Preparation of ASC solutions - Rheological characterization of ASC solutions - Modelling of fluid flow behaviour using power law
- RESULTS AND DISCUSSION : Model of fluid flow behaviour using power law - Effects of concentration on dynamic rheological properties - Effects of the pH of ASC solution on dynamic rheological properties - Effects of temperature on dynamic rheological propertiesEn ligne : https://drive.google.com/file/d/1hQTDRjuARXTTocj-_biEyARqmu88BR0e/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19567
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 97, N° 5 (09-10/2013) . - p. 195-199[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 15601 - Périodique Bibliothèque principale Documentaires Disponible Separation of a nanofiller from tannery effluents / Anita Przepiórkowska in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 1 (01-02/2006)
[article]
Titre : Separation of a nanofiller from tannery effluents Type de document : texte imprimé Auteurs : Anita Przepiórkowska, Auteur ; M. Prochon, Auteur ; K. Chronska, Auteur ; M. Zaborski, Auteur Année de publication : 2006 Article en page(s) : p. 7-9 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères
Caoutchouc nitrile-butadiène
Charges (matériaux)
Chaulage
CraieLa craie est une roche sédimentaire calcaire blanche marine de type biomicrite, de texture mudstone à packstone, à grain généralement très fin, tendre, marquante, poreuse et perméable, et assez pure contenant presque exclusivement du carbonate de calcium CaCO3 (90 % ou plus) et un peu d'argile. Formée dans des mers chaudes et peu profondes, elle est constituée essentiellement1 par l'accumulation d'algues planctoniques (surtout des coccolithes), auxquelles s’ajoutent en quantité variable des fragments d'inocérames, d'échinodermes ou de bryozoaires, ainsi que des foraminifères2. Les principales accumulations de craie en Europe datent du Crétacé, période géologique à laquelle la craie a donné son nom.
La craie est un calcaire souvent très pur, elle peut cependant être marneuse (lorsque le taux d'argile atteint des proportions plus élevées), glauconieuse (si elle contient de la glauconie), dolomitique (si elle contient des recristallisations de dolomite comme dans la craie de Vernon), à silex, etc. La craie contient fréquemment des niveaux de silex interstratifiés. Le tuffeau est de la craie micacée ou sableuse à grain fin, de couleur blanche ou crème parfois jaunâtre, contenant quelques paillettes de mica blanc (muscovite).
Cuirs et peaux -- Déchets
Eaux usées -- Epuration
Nanoparticules
Séparation (technologie)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Recent years have witnessed a growing interest in the technology of nano-materials. Numerous studies have been carried out on the synthesis and modification of nanometersized polymeric materials based on nanofillers. Meanwhile, tannery plants are faced with a serious problem of the utilization of effluents from the processes of leather dressing. The most serious problem is the wastewater from so-called beamhouse or the operations of soaking, depilation and liming.
Despite the implementation of technology with reduced water consumption, the effluents still amount to about 80% of wastewater from all the manufacturing processes.1 Most tanneries use the liming process to unhair hides by destroying the hair structure. The process has a low chemicals cost, good reproducibility of results and easy control of the process.
2. The effluents from the liming process contain two groups of impurities :
Organic pollutants, mainly products of degradation of non-collagen proteins, proteins of hair, bristle and epidermis as well as fatty substances.
Inorganic impurities, mainly lime and calcium compounds, residual chlorides from preservation, sodium sulfide and sulfates.Note de contenu : - EXPERIMENTAL METHODS : Use as rubber filler
- DISCUSSION OF TEST RESULTS : IR spectroscopy of the precipitate - Zeta potentials of aqueous dispersions of the tested precipitate and precipitated chalk - Specific surface of the precipitate - Measurement of particle size - Properties of mixes and vulcanisates/rubber
- Table 1 : Properties of mixes and vulcanizates of butadiene-acrylonitrile rubber (NBR)
- Table 2 : Properties of mixes and vulcanizates of carboxylated butadieneacrylonitrile rubber (XNBR)En ligne : https://drive.google.com/file/d/18Mec7IrU9cr9fGTY_Lk0aN8QDgA27_aM/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39177
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 90, N° 1 (01-02/2006) . - p. 7-9[article]Systematic analysis of material fluxes at tanneries / C. Konrad in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 1 (01-02/2002)
[article]
Titre : Systematic analysis of material fluxes at tanneries Type de document : texte imprimé Auteurs : C. Konrad, Auteur ; K. E. Lorber, Auteur ; R. Mendez, Auteur ; J. Lopez, Auteur ; M. Muñoz, Auteur ; D. Hidalgo, Auteur ; C. Bornhardt, Auteur ; M. Torres, Auteur ; B. Rivelca, Auteur Année de publication : 2002 Article en page(s) : p. 18-25 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse des flux de matières et d'énergie
Cuirs et peaux -- Déchets
Cuirs et peaux -- Industrie
Eau -- Consommation
Eaux usées
Tannage au chrome
Travail de rivière (cuir)Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The process of transforming animal skin to leather is characterised by a large consumption of fresh water and the generation of a high quantity of solid waste. As a consequence of the high water consumption tanneries are responsible for a huge quantity of waste water containing chromium, suphide and/or organic matter. In developing countries where treatment of solid waste and waste water treatment is not state of the art, tanneries cause a serious negative environment impact. Systemising the material fluxes at a tannery in order to provide rules of thumb for estimating their impact and developing pollution prevention opportunities is difficult. Nonetheless such an attempt is made in this paper. The data deriving from input/output-analyses which were carried out at 5 different tanneries (3 Chilean, 1 Spanish and 1 Ecuadorian) were concentrated to generalised material streams of two idealised tanning processes.
Scenario 1 is a conventional chromium-tanning process with the splitting stage in the beamhouse and paddle technology in the beamhouse. To transform 1 ton of wet salted hides (all data in this paper are based on 1 t wsH) into 500 kg product (grain- and split-leather and wet-blue) 63 m3 of fresh water and 442 kg of chemicals are required. 58 m3 of effluent and 696 kg of solid waste are generated.
Scenario 2 describes a chromium-tanning process with splitting in the tanyard (wet-blue stage) and drum technology applied in the beamhouse. By these two changes the water consumption and solid waste generation could be reduced significantly. Per ton wet salted hides, 55 m3 fresh water and 442 kg chemicals are consumed. 50 m3 of waste water and 477 kg solid waste are generated.
At each tannery a high potential for reducing water consumption and solid waste generation was detected. However, the figures presented in this paper describe the prevailing situation at most tanneries. Implementation of the pollution prevention and recycling measures suggested by the INCO-DC "EILT" working groups will still take time and will depend on the impact of legal restrictions and an active interest in reducing environmental impact.Note de contenu : - Results and discussion : Generalised flow sheet of the tanning process
- Input/output data : Waste water generation - Solid waste generation - Generalised input/output data
- Table 1 : Acronyms of Universities and corresponding tanneriesEn ligne : https://drive.google.com/file/d/1NGubxoC6qlI_pa7uRnxC14TIkwQtRqmf/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40192
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 86, N° 1 (01-02/2002) . - p. 18-25[article]PermalinkUV oxidation and recovery system for tannery unhairing waste / Imogene. L. Chang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XXVII (Année 1982)
PermalinkPermalinkWaste and allocation for leather / Abigail Clare in INTERNATIONAL LEATHER MAKER (ILM), N° 52 (03-04/2022)
Permalink