[article]
| Titre : |
Transformation plant for converting chromium waste into chemical products for the leather industry |
| Type de document : |
texte imprimé |
| Auteurs : |
Jaime Cot, Auteur ; J. Cot-Gores, Auteur ; F. Fernandez-Hervas, Auteur ; Pedro J. Celma, Auteur ; Albert M. Manich, Auteur ; Agusti Marsal, Auteur |
| Année de publication : |
2008 |
| Article en page(s) : |
p. 103 - 113 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
The experience gained by our research team in recent years has led to the optimization of a quick and effective procedure for the complete dechromation of chromium waste. This procedure is based on the oxidation of chromium (III) to chromium (VI) through the action of hydrogen peroxide in an alkaline medium. The highly toxic chromium (VI) is stored in a stainless steel tank before being subsequently reduced to chromium (III), which can be reused in the tanning process. The oxidation reaction, at room temperature, leads to the formation of peroxochromates that have great oxidizing power and which significantly accelerate the pre-hydrolysis; corresponding to the maceration stage in the gelatine production process. In this way, gelatine or any other type of collagen biopolymer can be obtained in a single stage and with an excellent yield. We have designed an industrial transformation plant for chromium waste in chemical products used by the tanning industry. This plant consists of the following equipment: defibering machine, hydroextractive centrifuge, two reactors (dechromation and for obtaining biopolymers), tank for storage and reduction of chromium (VI), atomizer (optional), simple equipment for heating concentrated biopolymer solutions, transportation truck. Given that the overall investment has a payback back in five years, the cost of the plant can easily be borne by the tanner. This project has two objectives: firstly, to help solving an important environmental problem faced by the leather industry, which incurs significant costs in managing this type of waste; and secondly, to enable acceptable financial gains in terms of obtaining chemical products designed for the tanning industry. These products are: basic chromium (III) salts from the chromium waste, collagen biopolymers suitable for retanning, filling, basifying, deliming and glazing finishes that can partially and/or totally replace casein. Our proposed transformation plant for chromium waste was designed in such a way as to be adaptable to the individual circumstances of all interested leather industries, thus avoiding the need to build a communal plant, where the costs of transporting waste would have a negative effect on final savings. The plant is designed to process all types of chromium waste produced during the tanning process and in the subsequent stages of manufacture (fatliquoring, retanning, dyeing and finishing), and includes chromium waste with wool/hair (double-face). A financial study of the overall installation and the corresponding cost in obtaining the new chemical products was also been carried out and reveals significant savings for the tanner. |
| En ligne : |
https://drive.google.com/file/d/1YMEn_JJMYoQ1bS88gsP7UcK8UX5vP8rl/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2578 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 3 (03/2008) . - p. 103 - 113
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Transformation plant for converting chromium waste into chemical products for the leather industry in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 3 (03/2008)
