Patent ID: 7902398
Filing Date: 2011-03-08
Classification: C07C

Abstract:
1. A carbonylation process comprising: (a) carbonylating a reactant in the presence of a Group VIII metal catalyst and an alkyl halide promoter component to form a carbonylated product reaction mixture in a reactor; (b) separating the stream of the carbonylated product reaction mixture into at least a first liquid recycle stream and a crude process stream; (c) feeding the crude process stream to a light ends column; (d) distilling the crude process stream to remove low boiling components and generate a purified process stream and, optionally, a second liquid recycle stream, wherein steps (a), (b), (c) and (d) are controlled such that the purified process stream has a Group VIII metal content of less than 100 ppb by weight; (e) treating the purified process stream having a Group VIII metal content of less than 100 ppb by weight with a polymer comprising nitrogen-containing heterocyclic repeat units operative to sequester on the polymer the Group VIII catalyst metal present in the purified process stream and (f) recovering the catalyst metal from the polymer by way of a technique selected from digesting the polymer and regenerating the polymer.