Methane → 4-Sulfobenzenediazonium hydroxide

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This example illustrates another method for the preparation of a carbon black product of the present invention. A fluffy carbon black with a surface area of 560 m2/g, a DBPA of 90 ml/100 and a volatile content of 9.5% was used. Fifty grams of the fluffy carbon black were added to a solution of 8.83 g of sulfanilic acid dissolved in 420 g of water. The resulting suspension was cooled to 30° C. and 4.6 g of concentrated nitric acid was added. An aqueous solution containing 3.51 g of sodium nitrite was then added gradually with stirring, forming 4-sulfobenzenediazonium hydroxide inner salt in situ, which reacts with the fluffy carbon black. The resulting product was dried in an oven at 125° C., leaving the carbon black product. The carbon black product contained 1.97% sulfur after Soxhlet extraction with ethanol overnight, compared to 0.24% sulfur for the untreated fluffy carbon black. This corresponds to attaching 53% of the p-C6H4SO3 -- groups to the carbon black product. Therefore, the carbon black product had 0.54 mmol/g of attached p-C6H4SO3 -- groups.

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