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Ajouter le résultat dans votre panierSoaking formulations that can soften hardened bovine manure / Mila Aldema-Ramos in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 7 (07/2011)
Titre : Soaking formulations that can soften hardened bovine manure Type de document : texte imprimé Auteurs : Mila Aldema-Ramos, Auteur ; Zerlina E. Muir, Auteur ; Richard Ashby, Auteur ; Cheng-Kung Liu, Auteur Année de publication : 2011 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bovins -- Fumier
Détergents
Formulation (Génie chimique)
GlycérineLe glycérol, ou glycérine, est un composé chimique de formule HOH2C–CHOH–CH2OH. C'est un liquide incolore, visqueux et inodore au goût sucré, utilisé dans de nombreuses compositions pharmaceutiques. Sa molécule possède trois hydroxyles correspondant à trois fonctions alcool responsables de sa solubilité dans l'eau et de sa nature hygroscopique. Un résidu glycérol constitue l'articulation centrale de tous les lipides de la classe des triglycérides et des phosphoglycérides.
PROPRIETES PHYSIQUES : Le glycérol se présente sous la forme d'un liquide transparent, visqueux, incolore, inodore, faiblement toxique si ingéré (mais laxatif à haute dose), au goût sucré.
Le glycérol peut se dissoudre dans les solvants polaires grâce à ses trois groupes hydroxyles. Il est miscible dans l'eau et l'éthanol ; et insoluble dans le benzène, le chloroforme et le tétrachlorométhane.
Son affinité avec l'eau le rend également hygroscopique, et du glycérol mal conservé (hors dessicateur ou mal fermé) se dilue en absorbant l'humidité de l'air.
- PROPRIETES CHIMIQUES : Dans les organismes vivants, le glycérol est un composant important des glycérides (graisses et huiles) et des phospholipides. Quand le corps utilise les graisses stockées comme source d'énergie, du glycérol et des acides gras sont libérés dans le sang.
- DESHYDRATATION : La déshydratation du glycérol est faite à chaud, en présence d'hydrogénosulfite de potassium (KHSO3) et produit de l'acroléine
- ESTERIFICATION : L'estérification du glycérol conduit à des (mono, di ou tri) glycérides.
- AUTRES PROPRIETES : Le glycérol a un goût sucré de puissance moitié moindre que le saccharose, son pouvoir sucrant est de 0,56-0,64 à poids égal13.
Le glycérol a des propriétés laxatives et diurétiques faibles.
Comme d'autres composés chimiques, tels que le benzène, son indice de réfraction (1,47) est proche de celui du verre commun (~1,50), permettant de rendre "invisibles" des objets en verre qui y seraient plongés.
Peaux brutes -- Nettoyage
Peaux brutes -- Trempe
SophorolipidesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Many of the damaging problems in hides and leather industry, such as grain damage and weakening of the leather product, can originate from putrefaction due to microbial contamination and mechanical stress due to the heaviness and pressure of hard to remove adobe type manure on bovine hides. New washing methods are urgently needed to effectively clean raw hides for their storage and shipments. The amphiphilic property of detergents and the capability of glycerol to insert into the detergent micelles were investigated in the formulation of an ideal washing solution. Since the softening of the hardened manure is the key to its removal during the demanuring process, the initial experiments presented in this report were designed such that the changes in hardness of the manure balls were monitored using a texture analyzer. The work needed to cause the same amount of deformation on the manure sample was measured and compared before and after soaking in the respective formulations. Various detergent types such as anionic (SDS), nonionic (Tween 20 and TritonX-114) and zwitterionic (LDAO) are evaluated and compared to the biodegradable surfactant, sophorolipid (SL). The sophorolipid with the addition of recycled crude glycerol was observed to be more effective in softening the hardened manure samples and will be further studied for “adobe” type manure removal. En ligne : https://drive.google.com/file/d/1YfsD0Xfdlk9M0p7glc4zYWywlz9H1LVm/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12030
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 7 (07/2011)[article]Réservation
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Titre : Chromium(III) pigments : Use of leather wastes as alternative starting material Type de document : texte imprimé Auteurs : Kalarical Janardhanan Sreeram, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2011 Article en page(s) : p. 219-225 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chrome trivalent -- Recyclage
Chromite
Cuir -- Déchets
Diffractométrie de rayons X
Incinération
Pigments métalliques
Récupération (Déchets, etc.)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Chromium containing leather wastes poses potentially significant challenges to the ecosystem when disposed of in landfills or when incinerated in the open. An attempt to recover chromium from such leather wastes so as to reduce the chromium that ends up in the landfill was studied. A method of recovery of the chromium in chromium tanned leathers by controlled closed furnace incineration and by employing the protein matrix as an energy source as well as a template for chromium(III) oxide synthesis is detailed. This method provides the advantage of reducing the chromium residues from the leather industry while producing chromite ore ultimately useful in the preparation of pigmented coatings. The dry pigment obtained was green colored and could be further processed and formulated as a pigmented coating (paint). When the chrome shavings were mixed with iron sulfate and then incinerated, a brown colored paint coating was achieved. The best conditions for zero generation/discharge of hazardous chromium(VI) were determined. The pigments developed were characterized in detail by XRD and SEM-EDAX. Photon correlation spectroscopy measurements indicate that the calcined pigments prior to further size reduction were in the range of 300-400 nm. En ligne : https://drive.google.com/file/d/1_VChVZ_rD7I0kqQV3B410GuK_-v8aPWo/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12031
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 7 (07/2011) . - p. 219-225[article]Réservation
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Titre : The further investigation of tanning mechanisms of typical tannages by ultraviolet-visible and near infrared diffused reflectance spectrophotometry Type de document : texte imprimé Auteurs : Junling Guo, Auteur ; Xin Huang, Auteur ; Chao Wu, Auteur ; Xuepin Liao, Auteur ; Bi Shi, Auteur Année de publication : 2011 Article en page(s) : p. 226-231 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alun
Glutaraldéhyde
Groupement carboxyle
Spectrométrie infrarouge
Spectrophotométrie UV-Visible
Spectroscopie de réflectance
Sulfate d'aluminium
Sulfate de chrome
Sulfate de fer
Sulfate de titane
Sulfate de zirconium
Tannage
Tannage végétalIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The ultraviolet-visible and near-infrared diffuse reflection (UV-Vis-NIR DR) spectroscopy was employed for further understanding the mechanisms of three kinds of classical tannages, including aldehyde tanning, vegetable tanning and mineral tanning. The NIR DR spectra of glutaraldehyde tanned leather exhibited a decreased peak intensity of amino group at 1475 nm, suggesting that the main reaction groups of collagen in aldehyde tanning are amino groups. Comparing the NIR DR spectra of pickled pelt and vegetable tanned leather, it was proved that the vegetable tanning is based on the mechanism of multiple hydrogen bonding interaction, where the amino groups, carboxyl groups and peptide chains are involved. As for mineral tannages, the tanning mechanisms of chromium sulfate, zirconium sulfate, ferrum sulfate, titanium sulfate and aluminum sulfate were investigated. Based on UV-Vis-NIR DR analysis in the wavelength range of 200 to 2070 nm, it was confirmed that the main reactions involved in mineral tanning are the chelating interactions of metal ions with both the carboxyl groups and the amino groups of collagen, although the reactivity of metal salts toward carboxyl groups is higher than toward amino groups. The reactivity of metal salts toward carboxyl groups of collagen follows the sequence of chromium salt > zirconium salt > ferrum salt > titanium salt > aluminum salt. However, the reactivity of metal salts to amino groups of collagen is in the sequence of zirconium salt > chromium salt > ferrum salt > titanium salt > aluminum salt. Meanwhile, the peptide chain of collagen was also found to play an important role in fixation of metal ions during tanning process. Note de contenu : EXPERIMENTAL : Preparation of leather samples - UV-Vis-NIR DR determinations.
RESULTS AND DISCUSSION : Comparison and analysis of DR spectra of CF, GA-CF and BT-CF - Comparison and analysis of DR spectra of metal salts tanned leathers.En ligne : https://drive.google.com/file/d/1XMCv5rwTd7b_YqA_uIwFpuqj1DFNGr8M/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12032
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 7 (07/2011) . - p. 226-231[article]Réservation
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Titre : Utilization of chromium-tanned leather solid wastes in microencapsulation Type de document : texte imprimé Auteurs : Bugra Ocak, Auteur ; Ahmet Aslan, Auteur ; Gürbüz Gülümser, Auteur Année de publication : 2011 Article en page(s) : p. 232-238 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Collagène
Cuir -- Déchets
Encapsulation
Fourier, Spectroscopie infrarouge à transformée de
Glutaraldéhyde
Huile essentielle de lavande
Hydrolysats de protéines
Microscopie électronique à balayage
Récupération (Déchets, etc.)
Recyclage (déchets, etc.)
Tannage au chromeIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this research, solid collagen-based protein hydrolysate was isolated from chromium-tanned leather wastes and its chemical properties were determined. After that, the use of collagen hydrolysate (CH) was investigated as a polymeric wall material in the microencapsulation process. The effects of variations in concentrations of CH, lavender oil (LO) and glutaraldehyde (GA), which were used during the microencapsulation process, on the oil load of microcapsules, oil content, encapsulation efficiency and release rate of oil were determined. The morphological structure of the microcapsules was investigated using optical and scanning electron microscopes (SEM). It was determined by FTIR studies that there was no evidence for any significant interaction between CH and LO. Note de contenu : MATERIALS AND METHODS : Preparation of collagen hydrolysate - Phase separation behaviour of collagen hydrolysate - Preparation of microcapsules - Determination of some chemical characteristics of collagen hydrolysate - Calibration curve of lavender oil - Determination of the oil load, oil content and encpsulation efficiency - Oil release studies - Optical and scanning electron microscopy studies - FTIR study.
RESULTS AND DISCUSSION : Some chemical characteristics of collagen hydrolysate - The effect on microcapsules of variations in oil concentration - Effects of variation of hydrolysate concentration - The effect of variation in glutaraldehyde concentration - Optical and scanning electron microscopic studies - Fourier Transform Infrared (FTIR) study.En ligne : https://drive.google.com/file/d/1vpL-zU-enBe_sD-OaV0OOevqpaXvpKVM/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12033
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 7 (07/2011) . - p. 232-238[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 013127 - Périodique Bibliothèque principale Documentaires Disponible
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| Code-barres | Cote | Support | Localisation | Section | Disponibilité |
|---|---|---|---|---|---|
| 013127 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |
