97% 1h-indole Cas No 120-72-9

Indole (CAS NO 120-72-9)

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Extraction from the wash oil fraction: in the high temperature coal tar, about 0.10%-0.16% of indole. Generally, indole can be extracted from coal tar and washing oil fractions. The wash oil fraction is alkali washed and acid washed to obtain methyl naphthalene fraction, and then rectified in a high efficiency tower with 60 theoretical plates, cut out the 225-256°C fraction, and add potassium hydroxide to melt. The reaction was carried out at 170-240°C for 2-4h, and stirred until bubbling stopped. Let it stand, let the lower layer of indole potassium be released to cool, smashed and washed with benzene to remove oil at low temperature. Then hydrolyze at 50-70°C to obtain crude indole oil, which is distilled in a distillation tower with 20 theoretical plates, with a reflux ratio of 8-10:1, and cut the fraction at the top of the tower with a temperature of 170-256°C, cool and crystallize , Centrifugal filtration to obtain refined indole. After squeezing to make the oil content below 3%, it is recrystallized with ethanol to obtain refined indole with a purity of 99%.

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