Process for the manufacture of oxalyl dihydrazide and the use of same as a coolant in gas generating compositions

• US 3,960,946 A
• Filed: 09/10/1974
• Issued: 06/01/1976
• Est. Priority Date: 03/10/1972
• Status: Expired due to Term

• Current Assignee: Thiokol Corporation (Howmet Aerospace, Inc.)
• Original Assignee: Thiokol Corporation (Howmet Aerospace, Inc.)
• Inventors: Pacanowsky, Eugene, Dewitt, Ivan L.
• Primary Examiner(s): Padgett, Benjamin R.
• Assistant Examiner(s): Walsh, Donald P.
• Application Number:
  US05/504,784
• Time in Patent Office: 630 Days
• Field of Search: 260/561 H, 260/557 H, 423/407, 423/410, 149/36
• US Class Current: 564/135
• CPC Class Codes: C06B 23/04 for cooling the explosion gases including antifouling and flash suppressing agents
• CPC Class Codes: C06B 47/08 a component containing hydrazine or a hydrazine derivative
• CPC Class Codes: C06D 5/06 by reaction of two or more solids
• CPC Class Codes: C07C 243/00 Compounds containing chains of nitrogen atoms singly-bound to each other, e.g. hydrazines, triazanes

Abstract

A curable homogeneous gas-generating composition composed essentially of oxalyl dihydrazide coolant combined with: (a) a perchlorate oxidizer selected from the group consisting of ammonium perchlorate, the alkali metal perchlorates, and the alkali earth metal perchlorates, (b) a combustible fuel binder, and (c) propellant adjuvants.

A process for the preparation of oxalyl dihydrazide is also disclosed.

The gas-generating compositions of the present invention have greatly improved combustion characteristics and exhibit reduced flame temperatures.

Claims

1. A process for the preparation of oxalyl dihydrazide which comprises reacting diethyloxalate and hydrazine at a temperature between about 30°

C and about 70°

C in a medium consisting substantially of distilled water.

2. A process as defined in claim 1 wherein the temperature is from about 40°

C to about 60°

C.

3. A process as defined in claim 2 wherein hydrazine hydrate is the source of the hydrazine in the reaction mixture.

4. In a method for making oxalyl dihydrazide wherein a dialkyl oxalate is reacted with hydrazine in a solvent medium, the improvement comprising conducting said reaction in a substantially distilled water solvent medium.

5. The improved method of claim 4 wherein diethyloxalate is reacted with hydrazine at a temperature of from about 40°

C to about 60°

C.