Physical and Chemical Properties | Grass yellow powder. Insoluble in water, soluble in sodium sulfide solution was yellow, in concentrated sulfuric acid was dark orange. |
Use | The vulcanized yellow G is mainly used for dyeing and printing of cotton, hemp, viscose fiber and vinylon, with bright and tender color, good fastness. Often with sulfur blue CV yellow and green, and sulfur bright green dye bright green. |
production method | with 2, 4-dinitrochlorobenzene and phthalic anhydride as raw materials, firstly, 2, 4-dinitrochlorobenzene reacts with ammonia to form 2, 4-dinitroaniline, which is then acylated with acetic anhydride. Then, 133 parts of 2, 4-dinitroacetanilide and 93 parts of phthalic anhydride were added to 280 parts of sodium sulfide and 94 parts of sulfur melted (95 °c), and salt was added, and the temperature was raised to 130 °c, hold for 10-11H, then rapidly warm to 180 °c for 3-4H until the end of the reaction. Then, it was cooled and crushed to obtain a finished product.. |