An improved process for gasification of a carbonaceous material, comprising: a. providing a gasification reactor, wherein said reactor converts carbonaceous feedstock to produce a mixture product comprising a first gaseous product stream and char, wherein said gaseous product stream comprises H 2 and CO; b. passing said mixture product through an initial separating device, whereby a majority of said char is removed from said gaseous product stream; c. introducing a coarse particulate fluxing agent into the gaseous product stream downstream from said initial separating device, wherein said coarse particulate fluxing agent has an average size range of 5-30 microns; d. providing a particle filtration unit comprising a plurality of filter elements downstream from the point of introduction of said coarse particulate fluxing agent, wherein a filtration media of the plurality of filter elements, when new, has a pore size that allows the passage of smaller particles of char but is smaller than the particle size of the coarse particulate fluxing agent; e. depositing a thin layer of the fluxing agent onto and within the pores of the filter elements, thereby conditioning the filter elements and decreasing the subsequent permeability of the filter elements to entrained char particles, while maximizing permeability of the filter elements to synthesis gas; f. periodically removing a mixture comprising filter-cake from the filter elements by back-pulsing, wherein said filter-cake comprises coarse particulate fluxing agent and char; and g. forming a mixture comprising the removed char of step (b) and the removed filter-cake of step (f), then routing this mixture to the gasification reactor of step (a). a. providing a gasification reactor, wherein said reactor converts carbonaceous feedstock to produce a mixture product comprising a first gaseous product stream and char, wherein said gaseous product stream comprises H 2 and CO; b. passing said mixture product through an initial separating device, whereby a majority of said char is removed from said gaseous product stream; c. introducing a coarse particulate fluxing agent into the gaseous product stream downstream from said initial separating device, wherein said coarse particulate fluxing agent has an average size range of 5-30 microns; d. providing a particle filtration unit comprising a plurality of filter elements downstream from the point of introduction of said coarse particulate fluxing agent, wherein a filtration media of the plurality of filter elements, when new, has a pore size that allows the passage of smaller particles of char but is smaller than the particle size of the coarse particulate fluxing agent; e. depositing a thin layer of the fluxing agent onto and within the pores of the filter elements, thereby conditioning the filter elements and decreasing the subsequent permeability of the filter elements to entrained char particles, while maximizing permeability of the filter elements to synthesis gas; f. periodically removing a mixture comprising filter-cake from the filter elements by back-pulsing, wherein said filter-cake comprises coarse particulate fluxing agent and char; and g. forming a mixture comprising the removed char of step (b) and the removed filter-cake of step (f), then routing this mixture to the gasification reactor of step (a).