a process for producing porous , spherical particles of cellulose fatty acid esters which comprises dissolving a cellulose fatty acid ester and a gelling agent therefor in an organic solvent , adding the solution thus obtained to an aqueous medium with stirring to form droplets , converting said droplets to gel particles of cellulose fatty acid ester in the presence or absence of a gelation accelerator , and separating porous , spherical particles of cellulose fatty acid ester .