对甲苯磺酸如何重结晶？ p-toluenesulfonic acid [6192-52-5] m 190.2, m 38° (anhydrous), m 105-107°(monohydrate), pk 1.55. purified by pptn from a satd soln at 0° by introducing hcl gas. also crystd from conc hcl, then crystd from dilute hcl (charcoal) to remove benzenesulfonic acid. it has been crystd from etoh/water. dried in a vacuum desiccator over solid koh and cacl2. p-toluenesulfonic acid can be dehydrated by azeotropic distn with *benzene or by heating at 100° for 4h under water-pump vacuum. the anhydrous acid can be crystd from *benzene, chc13, ethyl acetate, anhydrous meoh, or from acetone by adding a large excess of *benzene. it can be dried under vacuum at 50°.——purification of lab chemicals 5th 看你的情况，应该是吸水结块了。建议用100度真空干燥4小时（...or by heating at 100° for 4h under water-pump vacuum...）,用 koh 或者 cacl2做干燥剂。可能需要事先粉碎。 查看更多
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