C.C1C(Br)=C(Br)[NH:4]C=1C(O)=O.[NH2:12][CH2:13][CH2:14][S:15]([OH:18])(=[O:17])=[O:16].[N+:19]([O-:22])([OH:21])=[O:20].N([O-])=O.[Na+]>O>[N+:19]([O-:22])([O-:21])=[O:20].[S:15]([CH2:14][CH2:13][N+:12]#[N:4])([OH:18])(=[O:17])=[O:16]This example shows another method for the preparation of a carbon black product of the present invention. A fluffy carbon black with a surface area of 230 m2/g and a DBPA of 70 ml/100 g was used. Twenty grams of this black were added to a solution of 4.9 g of 2-aminoethanesulfonic acid in 180 g of water. Concentrated nitric acid (4.32 g) was added. A solution of 3.33 g of sodium nitrite in 15 g of water was added slowly with stirring, forming 2-sulfoethanediazonium nitrate in situ, which reacted with the fluffy carbon black. A large quantity of bubbles evolved. The product was dried in an oven at 135° C., leaving a carbon black product. The resulting carbon black product contained 1.68% sulfur after Soxhlet extraction with ethanol overnight, compared to 0.4% for the untreated fluffy carbon black. This corresponds to attaching 20% of the C2H4SO3 -- groups to the carbon black product. Therefore, the carbon black product had 0.40 mmol/g of attached C2H4SO3 -- groups.
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