Factory Supply 1, 2-phenylenediamine powder CAS 95-54-5 Raw Materials

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Uses and synthesis of 1, 2-phenylenediamine powder

1, 2-phenylenediamine powder precipitates from water as white to light yellow leaf-like crystals and from chloroform as prismatic crystals. Exposed to air, it changes color easily, from white to yellow, brown, purple, and finally black. Relative density 1.2698, melting point 103～104℃. Boiling point 256～258℃. Slightly soluble in cold water (4.15 at 35 ℃), soluble in hot water (733 at 81 ℃), ethanol, ether, chloroform and benzene.

1, 2-phenylenediamine Raw Materials with inorganic acids to produce soluble salts; 1, 2-phenylenediamine CAS 95-54-5 aqueous solution reacts with carbon disulfide 1,2-phenylenediamine CAS 95-54-5 in water reacts with carbon disulfide to form 2-mercaptobenzimidazole; reacts with carbon dioxide under pressure to form benzimidazolone.1,2-phenylenediamine CAS 95-54-5 is toxic and causes visual impairment when inhaled, and inflammation when it comes into contact with the skin and also in the eyes. Oral LD501070mg/kg in rats.

Applications / Functions of 1, 2-phenylenediamine powder

1. 1, 2-phenylenediamine powder is used as the intermediate of cationic dyestuff, and is the main raw material of the pesticide carbendazim and other antifungal agents.
2. 1, 2-phenylenediamine CAS 95-54-5 is used as analytical reagent, fluorescent indicator, also used in organic and dye synthesis.
3. 1, 2-phenylenediamine Raw Materials are used as pesticide, medicine, dye intermediates.
4. 1, 2-phenylenediamine powder is used as pesticide intermediates and dye intermediates.
5. 1, 2-phenylenediamine powder is the intermediate of fungicide carbendazim, thiophanate-methyl, thiabendazole, and also the intermediate of insecticide quinalphos, and it is also an important intermediate in dye industry.
6. 1, 2-phenylenediamine Raw Materials is the intermediate of dyestuffs, pesticides, auxiliaries, photographic materials and so on. It is used in the manufacture of polyamide, polyurethane, fungicide carbendazim and tolbutazin, reducing red GG, leveling agent, antioxidant MB, and also used in the preparation of developer surfactant.
7. 1, 2-phenylenediamine CAS 95-54-5 used as chemical raw materials, pesticides and dyes intermediates
8. Determination of nickel and niobium, selenium by spectrophotometric method. Determination of vanadium. Separate ozone from nitrogen oxides and hydrogen peroxide. Used to distinguish between nitrite, hydrogen peroxide and ozone. Fluorescent indicator for acid-base titration (green fluorescence at pH≦3.1, fluorescence disappears at pH≧4.4) Chelating precipitant. Reducing agent.1, 2-phenylenediamine powder is a peroxidase substrate suitable for ELISA enzyme-linked reaction. The substrate yields a soluble end product that is orange-brown in color and can be read by a spectrophotometer at 450 nm. The OPD reaction can be terminated with 3NHCl or 3MH2SO4 and read at 492 nm.

Physicochemical Property of 1, 2-phenylenediamine powder

1, 2-phenylenediamine powder has more active chemical properties, can be condensed with acids, aldehydes, ketones and other compounds to obtain heterocyclic compounds, but also can be oxidized, polycondensation, substitution, diazotization and other reactions.

Colorless monoclinic crystals, darkened in air and sunlight. 1, 2-phenylenediamine CAS 95-54-5 slightly soluble in cold water, more soluble in hot water, soluble in ethanol, ether and chloroform.

production methodprocess of 1, 2-phenylenediamine powder

Take o-nitroaniline as raw material, use sodium sulfide reduction method or catalytic hydrogenation reduction method to get 1, 2-phenylenediamine Raw Materials. 21% sodium sulfide solution and o-nitroaniline are added in the reduction pot, warmed up to 90 ℃, closed and warmed up to 105-110 ℃, the pressure is increased to 0.1-0.2MPa, stirred and reduced for 5h, cooled down to below 40 ℃, filtered. 40 ℃ or less, filtered. The filter cake is heated and melted, distilled under reduced pressure, and the 140-210 ℃ (7.89kPa) fraction is collected as o-phenylenediamine, with 70-80% yield. The hydrogenation process is carried out in an autoclave, the reaction temperature is 95-105℃, the pressure is about 2MPa, and the hydrogen reaction is passed under the action of nickel catalyst for about 1h, until the hydrogen pressure does not drop.The yield of 1, 2-phenylenediamine CAS 95-54-5 is above 97%.

There are several methods for its preparation as follows.

• Reduction method of o-nitroaniline with sodium sulfide

Using o-nitroaniline and sodium sulfide solution at a pressure of 98-196kPa, reaction temperature of 105-110 ℃, can also be carried out at a reaction temperature of 120-130 ℃ and atmospheric pressure, the reaction time of 3-4h, to get 1, 2-phenylenediamine Raw Materials.

• O-Nitroaniline Hydrogenation Reduction Method

Using o-nitroaniline as raw material and Raney nickel as catalyst, the product was obtained by controlling the temperature at 95~105℃ in an autoclave, continuously passing hydrogen until the pressure did not drop, and stirring the reaction under 1.960MPa pressure. Among the above two preparation methods, the purity of the product obtained by sodium sulfide reduction method is higher, the process route is more mature, and more factories in China use this method to produce 1, 2-phenylenediamine powder, but this method has poorer labor protection conditions and more wastewater. The catalytic hydrogenation method still has some problems in the process, industrialization needs to be further improved. In addition, there is o-dichlorobenzene ammonia decomposition method, which has been studied by many domestic units, but has not been industrialized.

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