Process for the production of propellant powders

C - Chemistry – Metallurgy – 06 – B

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C06B 25/20 (2006.01) C06B 21/00 (2006.01)

Patent

CA 1239286

A B S T R A C T There is described a process for the continuous or semi-continuous fabrication of propellant powders for the production of a powder having reproducable characteristics, in extremely safe conditions, thus overcoming the disadvantages found in the existing batch processes. In accordance with the invention, raw nitrocellulose is homogenised and stored under water in large tanks, from which it is fed in a controlled manner to a continuous centrifuge which re- moves water and alcoholises the nitrocellulose gradually. The alco- holised nitrocellulose is fed continuously to a stage where it is mixed with solvents and additives to form a gel which is compacted and extruded into filaments. Granules are made from the filaments and are transported in small batches to a preliminary drying step which removes that larger part of the solvents, in suitable vessels in a programmed manner. The granules discharged from these vessels are collected, in an inert state, and thereafter the powder is pre- pared and transported hydraulically to subsequent stages, including boiling and final drying.

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