Societe Nationale Des Poudres Et Explosifs

Societe Nationale Des Poudres Et Expolsifs, Antar Petroles De

Francois A Pollozec

Roger Maurice Rat

Jacques Plazanet

Michel B Maures

Remy Favrot

Andre J Mengelle

Jean Joseph Patouillet

Michel Nouaillant

Gontran Royer

In a continuous process for the nitration of cellulose, a slurry of cellulose in nitrating liquor is injected under pressure into a primary nitration reactor by means of an injection pump, the reactor comprising a loop of tubing, the slurry is circulated in the loop by means of a circulation pump at a rate which is greater than the rate of injection in order to ensure that the slurry is vigorously agitated, the slurry is optionally transferred, successively, from the primary loop to one or more secondary nitration reactors, each of which also comprises a loop of tubing equipped with a circulation pump, and the slurry is withdrawn from the final loop and the nitrocellulose is recovered.

Continuous process for the nitration of cellulose and apparatus therefor

A solid product impregnated with a liquid substance is subjected to successive washing operations in a washing zone by a process wherein:

Process for washing a solid substance impregnated with a liquid substance

Dilute solutions of corrosive products, such as sulphuric or phosphoric acid, are concentrated by pre-concentrating the dilute solution and then introducing the pre-concentrated solution into a tunnel in which it flows in a thin layer over successive cascades while being heated, preferably by indirect radiant heating. An installation for carrying out the process is also described.

Process and installation for concentrating dilute solutions of corrosive

A process for the production of plasticised nitrocellulose in the form designated 'semi-chips', comprises impregnating nitrocellulose flock while the latter is present in a stirred suspension in water, separating the plasticised nitrocellulose obtained from the suspension, and drying at a temperature not exceeding 60.degree. C. The novel nitrocellulose 'semi-chips' and the novel apparatus to carry out the invention are also described.

Growing community of inventors

Bergerac, France

Francois A Pollozec