Production and use of indigo

VC5.2.4.1
Production and use of indigo
Production and use of indigo

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Description

Experiment C5.2.4.1 synthesizes indigo, the dye used to colour jeans. Developed by Adolf von Baeyer in 1870, this synthesis was one of the first dye syntheses to be applied on an industrial scale. The educt used is nitrobenzaldehyde, which condenses with acetone under base conditions. The reduced, soluble leuco form of the dye is insolubly anchored in the tissue through oxidation by air.

Components of equipment sets

1 664246 Erlenmeyer flask, DURAN, 100 ml, wide neck LD
1 665162 Büchner funnel, 70 mm diam. LD
1 661031 Round filter, Type 595, 70 mm diam., 100 pcs. LD
1 665060 Rubber collars, set of 7 LD
1 664866  8  Suction flask, 500 ml, glass LD
1 38221  8  Stirring thermometer, -10...+110 °C LD
1 666967  8  Spoon-ended spatula, stainless steel, 150 mm LD
1 665751  8  Measuring cylinder 10 ml, with plastic base LD
1 665754  8  Measuring cylinder 100 ml, with plastic base LD
1 665996 Graduated pipette, 5 ml LD
1 666003  8  Pipetting ball (Peleus ball) LD
1 664101  8  Beaker, DURAN, 100 ml, squat LD
1 602043  8  Beaker, DURAN, 150 ml, squat LD
1 664103  8  Beaker, DURAN, 250 ml, squat LD
1 664154  8  Watch glass dish 80 mm Ø LD
1 665212ET10 Glass stirring rod, 200 mm x 8 mm diam., set of 10 LD
1 6677977  8  Electronic Balance 440-3N, 200 g : 0.01 g LD
1 37556  8  Water jet pump LD
1 667186  8  Vacuum rubber tubing, 8 mm diam. LD
1 666839  8  Magnetic stirrer with hot plate LD
1 6739390  4  2-Nitrobenzaldehyde, 5 g LD
1 6700410  4  Acetone, 1 l LD
1 6738420  4  Sodium hydroxide solution, 1 mol/l, 500 ml LD
1 6719711  4  Ethanol, absolute, 500 ml LD
1 6736310  4  Sodium dithionite, 250 g LD
1 6736810  4  Sodium hydroxide, pellets, 250 g LD
1 additionally required:
white cotton cloth

Experiment Instructions

PDF (Experiment description) PDF (Experiment description) C5.2.4.1 Production and use of indigo
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