Low Temperature Calcination Rates of Limestone

Abstract

L and further study might reveal a more optimum temperature for the reaction. The isopropylphenol waa more stable to cracking action than was the thymol.The results for this reaction are summarized in Table 11. A run, not recorded in the table, made at 550' C. and space velocity of 1970 yielded no benzofuran.In comparing the ease of dehydrocyclization of the various phenols, the most easily cyclized is the unsaturated o-allylphenol.A run with the o-propenylphenol, With the double bond next to the benzene ring, gave essentially the same results. Since these compounds are unsaturated to start with, they cannot be compared directly with the saturated phenols. Of these, thymol was the most easily dehydrocyclired, then isopropylphenol, and finally ethylphenol. From this limited group, it might seem that electron-releasing groups promote this reaction. Other phenols are being investigated with respect to this point.o-ETHYLPHENOL TO B~NZOFURAN.