| Use | blue-based BB is mainly used for cotton dyeing, also used for viscose fiber, silk dyeing and cotton printing. Dye blue with phenol AS, AS-D, AS-BO; Dye Red Navy with phenol AS-OL, AS-BS, AS-SW. The coupling ability is weak, and the coupling speed is medium. |
| production method | with 2, 5-diethoxyaniline as raw material, through benzoylation, nitration, reduction, the product was purified.. 543kg of 2, 5-diethoxyaniline (100) was added to the reaction pan, and benzoyl chloride and sodium carbonate were added at 85 °c. At the end of the reaction, cold water was added and filtered to obtain a wet product 2 ',5'-diethoxybenzanilide having a content of about 84%. Add 1800L of water and 78.5 of nitric acid into the nitrifying pot, add 1000kg of the above wet product within H, and the temperature will naturally rise to 50-60 ℃ (about 4-5H, a small amount of sample can be filtered and alkali washed, washing with water, drying to determine the melting point, if the melting point of 120-130 °c, should be further reaction). Heated with direct steam and boiled for 4-5H to form a yellow thick material (a small sample was filtered, alkali washed, washed with water, dried, and the melting point was measured. If it was 141-146 °c, The nitration reaction was complete). The mixture was diluted with 2000-2500L of water, the temperature was lowered to 55-60 °c, filtered and washed with cold water to give a wet product of 1400-1500kg of 4 '-nitro-2',5 '-diethoxybenzanilide. Add 8000L of pyridine water (containing 2900kg of pyridine) and 1500kg 4 '-nitro-2',5 '-diethoxybenzanilide to the reducing pot (Wet product), heated to 95 °c, 2H. Then, 2000L of 40% NaHSO3 solution was added and incubated at 95 °c for 6H. Then 80kg of zinc powder was added in 4H, and the reduction reaction was completed at 95 °c for 4H. 500L of 30% sodium hydroxide solution was added, and the reaction solution was weakly acidic to litmus paper. About 8000L of pyridine was distilled out within 12h, and the reaction solution was resumed. After evaporation of the pyridine, the reaction was diluted with 10000L of hot water, cooled to 60 °c, filtered, and the filter cake washed to sulfate-free. A wet product, 4 '-amino -2',5 '-diethoxybenzanilide, was obtained in an amount of 2500-3000kg. 7500L of water was added to the refining Pan, heated to 90 °c, 500L of 30% hydrochloric acid was added, and 1300kg of the above wet product was added as quickly as possible, which had to maintain acidity (but Brown on Congo red paper). After the product is completely dissolved, add 15kg of activated carbon and 15kg of sawdust (to flocculate and adhesion impurities), filter while hot, and add sodium carbonate solution to the filtrate with good stirring, the product was precipitated in the form of sand (the filtrate was acidic to litmus paper at the end). It was cooled to 50 °c and filtered. The filter cake was washed with water, dried at 50-60 °c, and ground to obtain about 680kg of product. |
