Indole ( CAS NO 120-72-9)
Source: From the wash oil fraction extracted in high temperature coal tar, containing about 0.10%-0.16% indole. General can be extracted from coal tar and oil distillate. Will wash oil fraction by alkali washing and acid washing, get methylnaphthalene, then distillation in high efficiency tower 60 theoretical plates, cut out the 225-256 C fraction, with potassium hydroxide melting. The reaction is 2-4h at 170-240 C and stirred until the bubble is stopped. Statically, the lower layer of indole potassium is released and cooled, and the oil is washed with benzene at low temperature. Then the crude indole oil was hydrolyzed at 50-70 C, and distilled in 20 distillation plates of theoretical plate. The flow rate was 8-10:1, and the top temperature was 170-256 C distillate, cooling, crystallizing and centrifugation, then refined indole oil was obtained. After squeezing, the oil content is below 3%, and the purified indole with the purity of 99% is recrystallized with ethanol.
Application:
(3) Used as a reagent for the determination of nitrite, also used in the manufacture of spices and pharmaceuticals.
(4) It is a raw material for spices, medicines, plant growth hormone drugs.
(5) Indole is the intermediate for the indole acetic acid and indole butyric acid. The indole acetic acid and indole butyric are plant growth regulator.
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Xiaoyi Jinjing Chemical founded in 2006, which has produced coal chemical products more than 12 years. Our company has been committed to providing high-quality products in the fields of medicine, pesticides, dye raw materials and intermediates. Our company is a large-scale supplier of pharmaceutical raw materials, biological raw materials, pesticide raw materials, dye raw materials, veterinary raw materials research, development and production.
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