Patent ID: 8388748
Filing Date: 2013-03-05
Classification: C08B,C08J

Abstract:
1. A continuous process for the preparation of low water content nitrocellulose solutions, comprising the steps of: providing a crude nitrocellulose solution comprising a solvent, water, and 3.5 to 12.5% nitrocellulose by mass, introducing the crude nitrocellulose solution into a first falling-film evaporator; passing the crude nitrocellulose solution through the first falling-film evaporator into a second falling-film evaporator; taking off from the second falling-film evaporator a finished nitrocellulose solution having 20 to 35% nitrocellulose by mass and a residual proportion of water of up to 1% by mass; and recirculating a portion of the solvent for subsequent reuse in preparing an additional crude nitrocellulose solution.