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Production and use of indigo

Production and use of indigo

VC5.2.4.1

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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 8	Erlenmeyer flask, DURAN, 100 ml, wide neck
1	665162 4	Büchner funnel, 70 mm diam.
1	661031 8	Round filter, Type 595, 70 mm diam., 100 pcs.
1	665060 4	Rubber collars, set of 7
1	664866 4	Suction flask, 500 ml, glass
1	38221 4	Stirring thermometer -10...+110 °C
1	666967 8	Spoon-ended spatula, stainless steel, 150 mm
1	665751 4	Measuring cylinder 10 ml, with plastic base
1	665754 4	Measuring cylinder 100 ml, with plastic base
1	665996 4	Graduated pipette, 5 ml
1	666003 4	Pipetting ball (Peleus ball)
1	664101 4	Beaker, DURAN, 100 ml, squat
1	602043 4	Beaker, DURAN, 150 ml, squat
1	664103 4	Beaker, DURAN, 250 ml, squat
1	664154 4	Watch glass dish 80 mm Ø
1	665212 4	Glass stirring rod 200 x 8 mm Ø
1	ADAHCB602H	Precision Balance, 600 g /0,01g, with USB interface
1	37556 4	Water jet pump
1	667186 4	Vacuum rubber tubing, 8 mm diam.
1	666839 4	Magnetic stirrer with hotplate
1	6739390 4	2-Nitrobenzaldehyde, 5 g Warning H302 H315 H319 H335
1	6700410 4	Acetone, 1 l Danger H225 H319 EUH066 H336
1	6738420 4	Sodium hydroxide solution, 1 mol/l, 500 ml Danger H314 H290
1	6719711 4	Ethanol, absolute, 500 ml Danger H225 H319
1	6736310 4	Sodium dithionite, 250 g Danger H251 H302 EUH031
1	6736810 4	Sodium hydroxide, pellets, 250 g Danger H314 H290
1		additionally required: white cotton cloth

Experiment Instructions

PDF (Experiment description)

C5.2.4.1 Production and use of indigo

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Production and use of indigo

Description

Components of equipment sets

Experiment Instructions

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