US1767798A - Process for purifying explosives - Google Patents

Description

Patented June 24, 1930 PATENT OFFICE DEAN M. JACKMAN', OF KENVIL, NEW JERSEY PROCESS F 3 PURIFYING EXPLOSIVES 1W0 Drawing.

Application filed July 24, 1925. Serial No. 45,981.

(GRANTED UNDER THE ACT or MARCH 3, 1883, AS AMENDED APRIL so, 1928; 370 0. a. 757) The invention described herein may be manufactured and used by or for the Government for governmental purposes without the payment to me of any royalty thereon,

5 This invention relates to a process for purifying explosives.

In the purification of explosives by recrystallization from solvents, I have'discovered that the solution may be washed to remove acids and other ingredients by a cleansing agent which does not combine With the particular solvent employed.

Certain substances such as toluene, benzene, xylene, carbon tetrachloride and others, which are good solvents for various explosives are insoluble or practically insolu-' ble in water'and, consequently, I may conveniently employ water as a cleansing agent.

In general, the process consists in dissolving a suificient amount of the explosive in a solvent to form a solution of suitable con centration at a temperature which is near the boiling point of the solvent. This solution is then brought into contact with a cleansing agent previously raised to the approximate temperature of the solution and the whole is then agitated so that a thorough washing effect is obtained. The cleasing agent ma be drawn off and the operation repeated 1n this manner as often as desired before crystallization is allowed to take place.

As a specific example of my improved process a solution of tetryl is made by dissolving a proximately 25 parts of the crude tetryl in 5 parts of toluene. This solution which is at a temperature of approximately the boiling point of toluene (110 C.) is agitated'in a closed vessel provided with a re- 40 flux condenser with an equal volume of water at a temperature of 80 to 85 C. The agitation is then discontinued and the water and the tetryl solution are allowed to separate,

. which they do readily. This washing operation may be repeated as often as desired or the temperatures used will be determined by 5 the particular explosive or I claim:

1. A process for purifying a normally solid aromatic nitro explosive com ound insoluble in water which consists in orming a solution of the explosive compound in a solvent which is practically insoluble in water and agitating the solution with a substantially equal volume of water of approxisolvent.

matelly the same temperature as the solution. '5

process for purifying a normally solid aromatic nitro explosive compound insoluble in water which consists in forming a solution of the explosive compound in a solvent which is practically insoluble in water and washing the solution with water .of approximately the same temperature as the solution. a

3. A process for purifying a normally solid aromatic nitro explosive com ound insoluble in water which consists in orming a solution of the explosive compound in a solvent which is practically insoluble in water and washing the solution with a substantially equal volume of water.

4. A process for purifying. a normally solid aromatic nitro explosive compound insoluble in water which consists in forming a solution of the explosive compound in a solvent which is practically insoluble in 85 water and washing the solution with water.

5. A process for purifying tetryl which consists in forming a concentrated solution of the tetryl and a solvent substantially immiscible with water at a temperature which 00 is near the boiling point of the solvent and agitating the solution with a substantially equal volume of water of approximately the same temperature as the solution.

6. A process for purifying tetryl which consists in forming a solution of twenty-five parts of tetryl and seventy-five parts of a solvent substantially immiscible'with water, maintaining the solution at a temperature approximately the boiling point of the solvent, adding an-equal volume of water of approximately the same temperature as the solvent, agitating, and then separating the water and solution.

DEAN M. JACKMAN.