Dyestuffs and Pigments

Phosphorus oxychloride (molecular formula: POCl3), also known as phosphoryl chloride, phosphorus oxychloride and phosphorus oxychloride, is an industrial chemical raw material and a colorless and transparent liquid. It has a pungent odor. Smoke violently in humid air. Relative density 1.67. Melting point: 1.25 ℃. Boiling point 105.1 ℃. It decomposes in water and ethanol to form phosphoric acid and hydrogen chloride. When a large amount of water is poured suddenly, a violent reaction can occur. POCl3 reacts with water and alcohol to form phosphoric acid or phosphate ester, such as o = PCl3 + 3H2O → o = P (OH) 3 + 3hcl. If alcohol replaces water in the reaction, the product is trialkyl phosphate. Such reactions are often carried out in pyridine or amine to absorb the generated HCl and promote the reaction. Under the catalysis of Lewis acid such as manganese chloride, POCl3 is co heated with excess phenol (aroh) to obtain triaryl phosphate. For example, when reacting with phenol: 3c6h5oh + o = PCl3 → o = P (oc6h5) 3 + 3hcl, phosphorus oxychloride is a Lewis base and will form adducts with many Lewis acids. For example, the adduct (POCl3 · AlCl3) formed by the reaction with titanium tetrachloride: cl3p + - O − + TiCl4 → cl3p + - O - − TiCl4 and aluminum chloride is very stable, so POCl3 is also used to remove AlCl3 from the product of Friedel Crafts reaction. In the presence of AlCl3, POCl3 reacts with hydrogen bromide to form pobr3. In industry, it is prepared by the reaction of phosphorus trichloride with oxygen or phosphorus pentoxide. It is mainly used to produce phosphate esters, such as trimethylbenzene phosphate.

This product is used as an intermediate of dyes and additives.

N-acetanilide is white glossy flake crystal or white crystal powder, odorless, slightly burnt taste, slightly soluble in cold water, soluble in hot water, methanol, ethanol, ether, chloroform, acetone, glycerol and benzene. N-acetanilide is the raw material and intermediate of sulfonamides, rubber vulcanization accelerators, dyes and synthetic camphor. It can also be used as analytical reagent, standard sample for quantitative analysis of organic elements (C, h, n), determination of cerium, chromium, lead, nitrate, nitrite and stabilizer of hydrogen peroxide.

Transparent yellow 3GL is mainly used for polyester dyeing. It can get bright pure yellow. It has excellent sun fastness and good covering. It is the main dye for medium and light colors. As one of the three primary colors, it can form three primary colors with Disperse Red 3B (or disperse red FB) and disperse blue 2BLN (or disperse blue FBL), with good compatibility, good levelness and stable color light. It is also used for direct printing of polyester silk; When used for dyeing polyester wool blended products, the wool is less stained. It can also be used for dyeing nylon and acetate fibers.

Carboxylic acid derivatives can be used as dye intermediates.