Abstract: Date fruits are extracted by a wet grinding operation after addition of water and subsequent filtration of the homogenized product with the aid of a cellulosic filter aid. The date pits may be used as the filter aid. A fermentation may be carried out before the filtration. A high concentrate feed material is thus obtained.

Abstract: A process for filtering a cellulose acetate solution comprises the steps of providing a solution of cellulose acetate which is dissolved in an organic solvent; adding to the solution a quantity of loose particulate matter and loose fibers so as to form a mixture; and filtering the solution through pores of a filter medium so as to produce a filtrate of the solution, whereby due to addition of the loose particulate matter and the loose fibers clogging of the pores is reduced relative to the amount of filtrate passing through the pores and the effective filtering time of the filtering medium is thereby increased.