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Primary Examiner: Williams, Howard S.
Assistant Examiner:
Attorney: Edelberg; Nathan, Gibson; Robert P., Voigt; Jack W.

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Title: Production of B.sub.2 H.sub.6 from BCl.sub.3 + H.sub.2 at room temperature by laser induced chemistry

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Claims: We claim:

1. A method for producing B.sub.2 H.sub.6 by laser induced chemistry comprising:

i. metering the gaseous reactants BCl.sub.3 and H.sub.2 in admixture into a laser cell to achieve a predetermined pressure ratio of said gaseous reactants up to a total pressure of about 0.5 atmosphere in said laser cell, said predetermined pressure ratio being in the range of about 1 of BCl.sub.3 to about 1 to 4 of H.sub.2 to ensure consonance between the concentration of said gaseous reactants and the power level of a cw CO.sub.2 multiline laser employed to irradiate said gaseous reactants to produce the intermediate HBCl.sub.2 ;

ii. irradiating said gaseous reactants in admixture by a cw CO.sub.2 multiline laser operating at a predetermined power level of said cw CO.sub.2 multiline laser for a predetermined time period of a few seconds to effect a laser induced chemistry reaction which produces the intermediate HBCl.sub.2 ;

iii. allowing said HBCl.sub.2 to undergo a disproportionation reaction for a predetermined time period from about 2 hours to about 24 hours to form the product B.sub.2 H.sub.6 in said laser cell in the presence of unreacted products;

iv. obtaining a spectra of the static products of said admixture to ascertain that said product B.sub.2 H.sub.6 has been formed in a desired yield amount; and,

v. separating said B.sub.2 H.sub.6 from said unreacted products in said laser cell.

2. The method of claim 1 wherein said gaseous reactants are metered in a predetermined pressure ratio of about 100 torr of BCl.sub.3 and of about 200 torr of H.sub.2 ; said predetermined power level of said cw CO.sub.2 multiline laser is about 150 watts; said predetermined time of irradiating is about 2 seconds; wherein said disproportionation reaction is allowed to take place for a predetermined time period of about 24 hours; and wherein said spectra ascertains that said product B.sub.2 H.sub.6 has been formed in a desired maximum yield.

Other info:

Inventors: Merritt, James A. (Pulaski, TN, US)
Robertson, Lawrence C. (Fayetteville, TN, US)

Application Number: 783579
Filing Date: 1977-04-01
Publication_date: 1978-01-24
Assignee: The United States of America as represented by the Secretary of the Army (Washington, DC)
Primary Class(es): 204/157.41 204/157.45
Other Classes:
US Patent Ref:
Other Refs: Other References: karlov, Applied Optics, (Feb., 1974), vol. 13, No. 2, pp. 301 & 306.
Rockwood et al., Chemical Physics Letters, (Aug. 1, 1975), vol. 34, No. 3, p. 542-545.