Patent ID: 7276223
Filing Date: 2007-10-02
Classification: B01J,C01B

Abstract:
1. A method performed in a stirred reactor comprising a multi-stage stirrer for carrying out a chemical reaction between a gas and at least one compound in solution and in the presence of a solid catalyst maintained, in a dispersed state, in suspension within the solution containing said compound; said method comprising: supplying said reactor, at its bottom portion, with said solution to be reacted and with said gas; bringing into contact, inside said reactor, said solution, said gas and said catalyst for carrying out said chemical reaction; recovering reacted solution at the top portion of said reactor; filtering said solution by passing it successively through at least one primary filter and at least one secondary filter; recovering filtered reacted solution which has been thus rid of said catalyst; sequentially backwashing said at least one primary filter with a pulsed flow taken from at least one selected from the group consisting of said filtered reacted solution and the supply solution to be reacted; wherein said backwashing returns the catalyst retained on said at least one primary filter into said reactor recirculating a fraction of unfiltered reacted solution towards a bottom portion of said reactor, at a first flow of unfiltered reacted solution which is greater than a second flow for supplying said reactor with solution to be reacted; said recirculation being provided by the multi-stage stirrer inside said reactor and by said fraction of unfiltered reacted solution being redirected, for said recirculation, at said at least one primary filter and thus providing for tangentially skimming over said at least one primary filter.