Heterogeneous recycling

Kantevari S, Chary MV, Vuppalapati SVN (2007) A highly efficient regioselective one-pot synthesis of 2,3,6-trisubstituted pyridines and 2,7,7-trisubstituted tetrahydroquinolin-5-ones using K5CoW12O40 center dot 3H(2)0 as a heterogeneous recyclable catalyst. Tetrahedron 63 13024-13031... 

Zeokarb-225 is a heterogenous, recyclable, eco-benign catalyst for the liquid-phase electrophilic substitution reactions of indoles with aldehydes or indole aldehydes to afford the corresponding bis(indolyl)methanes or tris(indolyl)methanes in good yields (Scheme 2.4). The catalyst is also effective for the synthesis of new diindolyl-carbazolylmethanes in good yields (Magesh et al. 2004). 

The procedure consisted in applying the main recommendations to date extracted from the SPIN programme to the reference CAPRA core homogeneous recycling of Np and heterogeneous recycling of Am. 

Z. S. Qureshi, S. A. Revankar, M. V. Khedkar, B. M. Bhanage, Catal. Today 2012,198,148-153. Aminocarbonylation of aryl iodides with primary and secondary amines in aqueous medium using polymer supported palladium N-heterocyclic carbene complex as an efficient and heterogeneous recyclable catalyst. 

Das B, Venkateswarlu K et al (2007) An efficient and convenient protocol for the synthesis of quinoxalines and dihydropyrazines via cyclization-oxidation processes using HClOySiO as a heterogeneous recyclable catalyst. Tetrahedron Lett 48 5371-5374... 

When the heterogeneous recycled polymer blends are to be used for applications without a downcycling, the materials must show improved mechanical properties. These can be generated ascertaining fine phase dispersion and intensive interactions between the phases. The method that leads to such improvement of properties is known in polymer blends industry as compatibilization. 

Poly ethyleneterephthalate - PET- and Poly(vinyl chloride) - PVC - are two of the most frequently encountered polymers in post-consumer plastics. In particular, these polymers can be used for manufacturing the same products (bottles, for example) and therefore are often found in the same stream, even when the collection is done with separation. The recycling of PET and PVC is usually carried out by separating them and reprocessing the two homogeneous polymers. Indeed, the heterogeneous recycling of two polymers is at present almost impossible because of many problems ... 

Keywords 6-Formyl-2,3-climethoxybenzoic acid, secondary amines, isocyanides, silica NPs, heterogeneous recyclable catalyst, solvent-free, room temperature, one-pot three-component reaction, l-carboxamido-3-oxoisoindolines... 

The additives can play an important role both in the homogeneous and in the heterogeneous recycling. 

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