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CAS: 569-61-9 Basic Red 9

Basic Red 9 is used as a biological stain, and can be applied to spectrophotometric detection in analysis and detection.

Production:

Add aniline, diaminodiphenylmethane, aniline hydrochloride, nitrobenzene and powdered ferric trichloride in a certain proportion to the reactor in sequence, and heat to 100°C while stirring to make the mixture become a homogeneous oil, and continue heating to Keep refluxing at 150°C. At this time, water will evaporate. 

When the water is no longer evaporating, stop heating and add hot water. Then slowly add sodium hydroxide solution while it is hot until the red color of the water layer disappears. Steam distillation 365bet娱乐book will produce aniline. , Add 30% hydrochloric acid to the distillate that is alkaline to phenolphthalein until it is slightly acidic, and heat to boiling. 

Stop heating, add sodium carbonate solution to the filtered filtrate until the redness of the filtrate disappears, and the auxiliary fuchsin is separated out, the auxiliary fuchsin is filtered out, washed with water, pressed dry and dissolved in ethanol, and concentrated sulfuric acid is added until the red intensity does not increase , And then heated to boiling, filtered while hot, the filtrate cooled and precipitated the product is pure secondary fuchsin.