43 results about "Nitrosylsulfuric acid" patented technology

The invention discloses an alkali-resistant disperse blue dye, its compound mixture and a preparation method thereof. This alkali-resistant disperse blue dye is a structure made by diazotizing 3-amino-5-nitrobenzisothiazole with nitrosylsulfuric acid, and then reacting with meta-ortho-substituted-N-substituted aniline emulsion Be the compound shown in structural formula (I). The alkali-resistant disperse blue dye involved in the present invention is green and environmentally friendly in the production process. It has been verified that it can be applied to the dyeing of polyester, nylon, spandex and other hydrophobic fibers and their blended fabrics. It has bright luster and can replace disperse blue 165 and disperse blue dyes. Blue 56; and by compounding with azo-type disperse dyes and anthraquinone-type disperse dyes in different proportions, it can achieve the effect of adjusting dye shade and synergizing to meet the needs of different application conditions. Simultaneously, the dyestuff of the present invention has high liftability, excellent fastness to water washing, sun exposure, sublimation, etc., excellent comprehensive performance, and has broad application prospects.

A monoazo compound used for the disperse yellow dye with high dye fastness is prepared through diazotizing reaction between dichlorophenylamine and nitrosylsulfuric acid in sulfuric acid to obtain diazonium salt, coupling reaction on N-cyanoethyl-N- benzylphenylamine and post-treating.

The invention discloses a process for preparing nitroso sulfuric acid by recycling cyclopropylamine to produce tail gas sulfur dioxide. The steps of the process include: S01: obtaining sulfur dioxide gas from a cyclopropylamine production process; S02: sulfur dioxide gas enters a primary absorption kettle and is mixed with The primary absorption liquid in the primary absorption kettle reacts, the tail gas of the primary absorption kettle enters the secondary absorption kettle and reacts with the secondary absorption liquid in the secondary absorption kettle, and the tail gas of the secondary absorption kettle enters the tertiary absorption kettle and reacts with the secondary absorption liquid in the secondary absorption kettle. The tertiary absorption liquid reaction in the tertiary absorption kettle; wherein, the primary absorption liquid and / or the secondary absorption liquid is a mixed acid solution containing sulfuric acid, concentrated nitric acid and nitroso sulfuric acid; the tertiary absorption liquid is sulfuric acid; S03: a The crude product produced by the reaction in the first-stage absorption kettle is transferred to a thin-film evaporator for purification to obtain nitroso-sulfuric acid. It not only realizes the recovery and utilization of tail gas sulfur dioxide, but also separates tail gas absorption and crude product refining through multi-stage absorption kettles and thin film evaporators, which reduces the generation of waste gas in the production process of nitroso sulfuric acid and ensures the quality of nitroso sulfuric acid. .