Process and apparatus for inflating airbags and remediating toxic waste gases

• US 6,251,200 B1
• Filed: 06/29/1999
• Issued: 06/26/2001
• Est. Priority Date: 06/29/1999
• Status: Expired due to Term

• Current Assignee: UOP Llc (Honeywell International Inc.)
• Original Assignee: UOP Llc (Honeywell International Inc.)
• Inventors: Dunne, Stephen R.
• Primary Examiner(s): Carone, Michael J.
• Assistant Examiner(s): FELTON, AILEEN BAKER
• Application Number:
  US09/342,758
• Time in Patent Office: 728 Days
• Field of Search: 280/741, 502/60, 423/700, 423/718, 149/19.92, 149/109.6, 149/108.4
• US Class Current: 149/108.4
• CPC Class Codes: C06B 23/02 for neutralising poisonous gases from explosives produced during blasting
• CPC Class Codes: C06B 23/04 for cooling the explosion gases including antifouling and flash suppressing agents
• CPC Class Codes: C06B 45/00 Compositions or products which are defined by structure or arrangement of component of product explosive charges of particular form or shape F42B1/00, F42B3/00
• CPC Class Codes: C06D 5/06 by reaction of two or more solids

Abstract

Molecular sieve zeolites are incorporated in the inflator device to assist in the inflation of airbags in passenger vehicles. The pre-loading of the molecular sieve zeolites with gases such as air or nitrogen or carbon dioxide provides for rapid airbag inflation and following inflation, additionally provides the remediation of at least a portion of the toxic waste gases generated by the exploding inflator device. Molecular sieve zeolites, particularly zeolites X, having been exchanged with lithium or calcium, provide high-capacity gas storage and enhanced toxic waste gas adsorption. The use of molecular sieve zeolites reduces risk of injury to occupants of vehicles from exposure to hot, toxic waste gases following airbag deployment.

Claims

1. A process for reducing the temperature of an inflating airbag, said process comprising:

a) detonating an airbag inflator comprising a pyrotechnic adjacent to a zeolite molecular sieve, said molecular sieve being pre-loaded with a stored gas, said pyrotechnic providing a generated gas comprising toxic compounds to inflate the inflating airbag;

b) desorbing and expanding the stored gas from the zeolite molecular sieve to cool the generated gas and fluidizing at least a portion of the zeolite molecular sieve; and

,

c) adsorbing at least a portion of the toxic compounds on the zeolite molecular sieve.

2. The process of claim 1 wherein the zeolite molecular sieve comprises a zeolite X.

3. The process of claim 1 wherein the pyrotechnic is selected from the group consisting of sodium azide, nitrocellulose, or mixtures thereof.

4. The process of claim 1 wherein the zeolite molecular sieve is present according to a weight percentage of the pyrotechnic within a range of 25 to 70 weight percent of the pyrotechnic.

5. The process of claim 1 wherein the zeolite molecular sieve comprises a highly exchanged zeolite X with a cation selected from the group consisting of sodium, lithium, calcium and mixtures thereof.

6. The process of claim 1 wherein the zeolite molecular sieve comprises a highly exchanged zeolite X, having been at least 67 percent exchanged with a cation selected from the group consisting of sodium, lithium, calcium and mixtures thereof.

7. The process of claim 1 wherein the stored gas comprises nitrogen.

8. The process of claim 1 wherein the zeolite molecular sieve comprises a particle size between about 1.4 and about 1.9 mm.

9. The process of claim 1 wherein the zeolite molecular sieve is selected from the group consisting of potassium zeolite A, potassium erionite, sodium clinoptilolite, and mixtures thereof.