The Exchange Reaction between Hydrogen Chloride and Aluminum

5762

NOTES

The Exchange Reaction between Hydrogen Chloride and Aluminum Chloride BY RIONTE BLAU,\VII.LIAM T. (IARNALL AAU WILLARD I V E ~Auc;usr 1 1 , 1952

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JOIIN

Kichardsuii and Henson’ l1:tvc obscrvctl that 1 1 0 cxchange occurred between hydrogen chloride and duminum chloride when they were allowed to staiid iii contact €or 12 hours a t room temperaturc. Equilibrium exchange occurred in a SG-hour run with a maximum temperature of 213”. These investigators uscd reagent grade aluminuni chloride “further purified by fractionation in a11 allPyrcx system pressured to 1.2 atin. with tlry nitrogcii .’’ The purpose of this iiotc is to r c p r t cxperinicuts, using aluininuiii cliloritlc syn thesizctl in situ and hfallinckroclt conitnercial “Xlumiiiuni Chloride Anhydrous’’ resublimed ill vacuutn, in which we have observed exchange with liydrogcii chloride a t room temperature in times as short as five iuinutes. The results are sunimarized in Taljle I. l‘Ai3LE

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I7XCIiANGE O F CfILOKINB BET!!

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ALUMINUM CHLORIDE A. C138 initially in alutniiiuin chloride: \.uluiiic ol r’eac190 ml. iii cxpt. 3 anti 4. tioii flask: 1 liter in expt. 1 a! a , b a n d c, etc., rcprcsent su ,ire fresh s~~iriples of I-iC1 cxposcd to :I single aluminum ride surface. The values in the last column show the c/o of the activity originally i i i the alurriirium chloride which appeared in cach saiiplc of HC1. In expts. 3a and 3c, CHzC12 was substituted for HC1. All cxpts. wcre tnadc ;it 2.i’ unless otherwise intiic,itcci in parentheses in column I . ASD

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