Green chemistry for low VOC and waste management / Shradha Krishna Pednekar in PAINTINDIA, Vol. LXVII, N° 4 (04/2017)  

[article]  inPAINTINDIA > Vol. LXVII, N° 4 (04/2017) . - p. 80-88 Titre : Green chemistry for low VOC and waste management Type de document : texte imprimé Auteurs : Shradha Krishna Pednekar, Auteur Année de publication : 2017 Article en page(s) : p. 80-88 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Accidents -- Prévention Catalyseurs Chimie écologique Déchets -- Elimination Déchets -- Réduction Efficacité énergétique Fluides supercritiques Pollution -- Lutte contre Produits chimiques -- Biodégradation Ressources renouvelables Solvants écologiques Index. décimale : 660 Technologie chimique (chimie industrielle) et techniques connexes Résumé : The uses of hazardous and toxic solvents in paint laboratories and in paint industries are considered a very crucial problem for health and safety of workers and environment. Majority of solvents are organic chemicals with harmful and toxic properties, large waste part of by-products of the chemical industry causing environmental and health problems, but its uses are important. So, it is better to prevent voc and minimize waste than to face problems and treat or clean up waste after it has been created, therefore, it is widely acknowledged that there is a growing need for more environmentally acceptable processes in the chemical industry. The trend towards what has become known as Green Chemistry' or Sustainable Technology', necessitates a paradigm shift from traditional concepts of process efficiency, that focus largely on chemical yield, that assigns economic value to eliminating waste at source and avoiding the use of toxic and/or hazardous substances. The review paper is mainly based on the Green chemistry, which places both company profitability and ecological health at the heart of innovative product design and manufacturing. It uses the creativity of nature's biological processes to create molecules, materials and processes that are safe and high-performing. Note de contenu : - SUSTAINABLE GREEN CHEMISTRY : Economic - Materials - Waste - GOALS OF GREEN CHEMISTRY : 1. Prevent waste - 2. Maximize atome economy - 3. Less hazardous chemical synthesis - 4. Designing safer chemicals and products - 5. Safer solvents and reaction condition - 6. Increase energy efficiency - 7. Use renewable feedstock - 8. Avoid chemical derivatives (protecting groups) - 9. Use catalysts - 10. Design chemicals and products to degrade after use - 11. Real time analysis for pollution prevention - 12. Minimize potential for accidents - GREEN SOLVENTS FOR LOW/NO VOC : Green solvents - a. Oxidations under green chemistry principles to reduce solvents - b. Catalytic selectivity in synthesis to reduce solvents - Process for bio solvent/green solvent (supercritical CO2) - SUPERCRITICAL CO2 AS A SOLVENT : Importance of supercritical carbon dioxide - WASTE MANAGEMENT - COSTS OF WASTE : Source reduction - Recyclable products - Good management and control - Waste segregation - CHALLENGES AND OPPORTUNITIES : Challenges - For every challenge offered by green chemistry revolution, there is also an exciting opportunity - OPPORTUNITIES - LIMITATIONS AND BENEFITS - FUTURE TRENDS IN GREEN CHEMISTRY : Oxidation reagent and catalysis - Non covalent derivatization - Supramolecular chemistry - Biometric multifunctional reagents - Combinatorial green chemistry - Energy focus - Proliferation of solvent less reaction En ligne : https://drive.google.com/file/d/1o-_ByFjnQh2n7QhFA6KbdXLTp1GjCD89/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28461 [article]

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Novel methods for recycling & reusing automotive paint sludge / Shradha Krishna Pednekar in PAINTINDIA, Vol. LXXII, N° 5 (05/2022)  

[article]  inPAINTINDIA > Vol. LXXII, N° 5 (05/2022) . - p. 66-72 Titre : Novel methods for recycling & reusing automotive paint sludge Type de document : texte imprimé Auteurs : Shradha Krishna Pednekar, Auteur Année de publication : 2022 Article en page(s) : p. 66-72 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Automobiles -- Revêtements:Automobiles -- Peinture Boues résiduaires Déchets industriels -- Recyclage Peinture -- Récupération Pyrolyse La pyrolyse est la décomposition ou thermolyse d'un composé organique par la chaleur pour obtenir d'autres produits (gaz et matière) qu'il ne contenait pas. L'opération est réalisée en l'absence d'oxygène ou en atmosphère pauvre en oxygène pour éviter l'oxydation et la combustion (L’opération ne produit donc pas de flamme). Il s'agit du premier stade de transformation thermique après la déshydratation. Elle permet généralement d'obtenir un solide carboné, une huile et un gaz. Elle débute à un niveau de température relativement bas (à partir de 200 °C) et se poursuit jusqu'à 1 000 °C environ. Selon la température, la proportion des trois composés résultants est différente. Récupération (Déchets, etc.) Revêtements -- Déchets:Peinture -- Déchets Index. décimale : 667.6 Peintures Résumé : The application of solvent-based paints and water-based paints by spraying is extensively used in the automotive industry both to protect metallic parts and to provide a desirable aesthetic appearance for the vehicle. This operation is a significant source of sol id waste (paint sludge), liquid waste (booth water) and, when solvent-based paints are used, also volatile organic compounds (VOCs). Mixing and painting operations are major sources of environmental concerns in the shop and can present some of the greatest pollution prevention opportun ities. Taking advantage of opportunities to minimize paint wastes makes sense for business and for the environment. Paint sludge represents an important problem both from a managerial and from an environmental point of view owing to its huge volumes and hazardous characteristics. The main actual fate of automotive paint sludge is the incineration and/or the landfil I disposai but this paper aims to provide an overview of the novel processes developed over the last few years to treat automotive paint sludge in order to recover useful products from the waste or reuse it in the industry of sealants, paints and building materials. Note de contenu : - INTRODUCTION : Why minimize paint waste ? - Paint waste minimization options - REDUCE (AT POINT OF GENERATION) : Color matching - Improve paint measurement and mix only what you need - Track paint use from start to finish and troubleshoot - REUSE (FOR THE SAME OR OTHER PURPOSE) : When leftover paint cannot be avoided - RECYCLE (REPROCESS TO RE-ESTABLISH USEFULNESS) : Disposal methods for sludge presently being followed - Alternative solutions : Recycling - RECOVER (ENERGY FROM WASTE, RECLAIM ITEMS OF VALUE OR REMOVE HAZARDOUS COMPONENTS PRIOR TO DISPOSAL) : Economical benefits of recycling - Advantages of recycling - Disadvantages of recycling - Conventional method for recycling paint sludge - NOVEL METHODS FOR RECYCLING & REUSING PAINT SLUDGE : Process flow chart - REACTION OF PYROLYSIS PROCESS : Benefits & constraints of recycling sludge En ligne : https://drive.google.com/file/d/1zui0eghHJm3EtVyYDfVJFIqbPeqKZPpE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37802 [article]

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