| production method | using 1,4,5,8-tetrahydroxyanthraquinone and p-butyl aniline as raw materials, 1,4,5,8-tetrahydroxyanthraquinone is partially reduced first, then condensed with p-butyl aniline, oxidized, then sulfonated and neutralized to obtain products. The finished product is salted out, filtered, dried and crushed.. It is also possible to use 1, 4-dihydroxy-5, 8-dichloroanthraquinone and p-butyl aniline as raw materials to obtain products by condensation and sulfonation. Put 47.3g of p-butyl aniline, 5g of 1,4,5,8-tetrahydroxyanthraquinone crypto, 2g of boric acid and 0.6g of p-nitrotoluene into the three-mouth bottle, stir and raise the temperature to 130 ℃ for 0.5-1h, cool to 70 ℃, add industrial ethanol, continue to stir for 0.5h, cool to about 35 ℃, precipitate condensate, stand, filter and dry to obtain 6-6.5g condensate. Add 72g of fuming sulfuric acid and 0.57g of boric acid to the three-mouth bottle, stir and heat to 70 ℃ to dissolve it, cool the ice bath to below 20 ℃, add condensate in batches, and react below 30 ℃ for 20-30min to the end of the reaction. The reactant is poured into ice, filtered, the filter cake is dissolved in ice water, neutralized with 30% sodium hydroxide to pH = 6-7, salt is added for salting out, and 11-19g of product is obtained by filtration, drying and crushing. |