Removal of phosgene impurity from boron trichloride by laser rad

Details Removal of phosgene impurity from boron trichloride by laser rad Removal of phosgene impurity from boron trichloride by laser rad

1976-12-27

1977-12-20

Reese, Robert M.

Chemistry: physical processes

Physical processes

Crystallization

2041571R, 204DIG11, B01J 110

Patent

active

040638960

ABSTRACT:
Phosgene, COCl.sub.2, an impurity in BCl.sub.3 is dissociated by CO.sub.2 ser radiation that is passed through a stainless steel laser cell with NaCl windows on each end of the cell. The power level of a cw CO.sub.2 multiline laser can be varied to accomplish the irradiation to effectively dissociate the COCl.sub.2 into its dissociation products, substantially CO and Cl.sub.2. The BCl.sub.3, .nu..sub.3 (956 cm.sup.-1) fundamental is resonant with CO.sub.2 (P.sub.20) laser line and strongly absorbs this energy which is followed by an intramolecular V--V transfer of energy to the COCl.sub.2 which results in its dissociation. The gaseous compound C.sub.2 H.sub.4 having combination bands and overtones that match reasonably close to the energy levels of COCl.sub.2 can also serve as a diluent for COCl.sub.2 to effect transfer of energy for dissociation of COCl.sub.2 by cw CO.sub.2 laser radiation.

REFERENCES:
T. A. Osial, Instruments & Control Systems, Oct. 1967, pp. 101-104.
Chem. Abstr. 75, 56720a (1971), Okabe et al.

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