Process for continuously dissolving a particulate solid material, notably a lignocellulose material

摘要

A fragmented material is dissolved continuously by impregnation and immersion into a solvent bath in which said material is subjected to a moderate mixing movement allowing it to be kept within the interior of said bath to undergo dissolution therein until formation of fine residual particles of insoluble material which are maintained in suspension by this movement, the whole being removed continuously by a controlled overflow of the bath. This process is applied to cellulose contained in various lignocellulosic materials, which is dissolved continuously by immersion of the previously impregnated material into a bath of hydrochloric acid through which hydrogen chloride gas is caused to bubble, to effect complete dissolution of the cellulose and suspension of the fine insoluble residual lignin particles.