a*i
发帖数: 1652 | 1 I am using MEK, but it looks a little yellowish.
Is it normal or how can I purify it? Thanks. | k***l
发帖数: 25 | 2 2-Butanone (methyl ethyl ketone, MEK) [78-93-0] M 72.1, b 79.6o, d 4
20 0.853, n D
20
1.37850, n2 5 1.37612, pK2 5 -7.2 (aqueous H2SO4) . In general, purification
methods are the same as
for acetone. Aldehydes can be removed by refluxing with KMnO4 + CaO, until
the Schiff aldehyde test is
negative, prior to distillation. Shaking with saturated K2CO3, or passaging
through a small column of activated
alumina, removes cyclic impurities. The ketone can be dried by careful
distillation (an azeotrope | a*i
发帖数: 1652 | 3 OMG...Thanks a lot.
purification
passaging
【在 k***l 的大作中提到】
: 2-Butanone (methyl ethyl ketone, MEK) [78-93-0] M 72.1, b 79.6o, d 4
: 20 0.853, n D
: 20
: 1.37850, n2 5 1.37612, pK2 5 -7.2 (aqueous H2SO4) . In general, purification
: methods are the same as
: for acetone. Aldehydes can be removed by refluxing with KMnO4 + CaO, until
: the Schiff aldehyde test is
: negative, prior to distillation. Shaking with saturated K2CO3, or passaging
: through a small column of activated
: alumina, removes cyclic impurities. The ketone can be dried by careful
|
|
