CAS number：106-50-3
molecular formula：C6H8N2
molecular weight：108.14
EINECS number：203-404-7

English synonyms

JAROCOL PPD;fur black 41866;C.I. 76060;BENZENE-1,4-DIAMINE;1,4-PHENYLENEDIAMINE;1,4-DIAMINOBENZENE;1,4-BENZENEDIAMINE;4-AMINOANILINE

Related categories

Amines; Dyestuffs; General Reagents; Other Biochemical Reagents; Pharmaceutical Intermediates; Azo; Analytical Standards; Aromatic Hydrocarbons; Amines; Organic Chemicals; Fluorine Chemistry, Halogenated Hydrocarbons; Organic Raw Materials; Agricultural and Environmental Standards; Industrial Raw Materials; Photosensitive materials and intermediates; biochemical reagents; intermediates - dye intermediates; intermediates; Chinese medicine reference substances; organic intermediates; chemical products - organic chemicals; chemical reagents; benzene rings; organic chemical raw materials; raw materials; Intermediates;Dye Intermediates;Pharmaceutical Materials;Chemical Materials;Organic Intermediates;VARIOUSAMINE;IntermediatesofDyesandPigments;1,4-Benzenediamine;Fluorenes,etc.(reagentforhigh-performancepolymerresearch);FunctionalMaterials;ReagentforHigh-PerformancePolymerResearch;Chemistry;Amines;Aromatics;Intermediates&FineChemicals; Pharmaceuticals;Environmental;amineseries;FineChemicals;Fluorescent;non-ammonia non-anhydrides;chemical raw materials;chemicals;chemical products;chemical reagents;106-50-3

Introduction

P-Phenylenediamine (English p-Phenylenediamine), also known as Urs D, is one of the simplest aromatic diamines. The pure product is white to lavender crystals, which turn purple or dark brown when exposed to air. Slightly soluble in cold water, soluble in ethanol, ether, chloroform and benzene. It can be used to prepare azo dyes, high molecular polymers, and can also be used to produce fur dyes, rubber antioxidants and photo developers, mainly used for aramid, azo dyes, sulfur dyes, acid dyes, and can also be used as fur D. Production of fur blue black DB, fur brown N2, and rubber antioxidants DNP, DOP, MB. It is also used as the raw material of cosmetic hair dye Wuersi D series, gasoline polymerization inhibitor and developer. As a chemical dye, p-phenylenediamine is currently allowed to be used in the production of hair dyes, but the amount of use is clearly limited. According to my country's "Hygienic Standards for Cosmetics", the content of p-phenylenediamine in hair dyes should not exceed 6%. According to experts, although the content of p-phenylenediamine in the five "one wash black" shampoos is between 1.1% and 1.4%, the high frequency of use of shampoos and long-term accumulation can easily pose a threat to consumers' health and safety. Whether phenylenediamine is a carcinogen or not has no literature basis; but p-phenylenediamine is an organic drug is based on literature, see page 980 of "Reagent Handbook" (Second Edition) published by Shanghai Science and Technology Press in November 1985. Foreign studies have shown that the incidence of breast cancer, skin cancer, leukemia and skin cancer will increase in people who often dye their hair. In addition, p-phenylenediamine is a commonly used sensitive reagent for the detection of iron and copper. It is also used in aircraft coatings, body armor inner films, wall coatings, etc. internationally.

White to purplish red crystals. Turns purple or dark brown when exposed to air. Soluble in water, ethanol, ether, chloroform and benzene.

Use

●  It is an important dye intermediate, mainly used in the manufacture of azo dyes and sulfur dyes, and can also be used in the production of fur black D and rubber antioxidant DNP, etc.

●  Used as a fluorescent indicator, analytical reagent and fur dye, also used in the synthesis of dyes Mainly used in the manufacture of azo dyes and sulfur dyes, also used in fur black D, fur blue black DB, fur brown NZ and rubber antioxidants Chemicalbook production of DNP, 288, DOP, DBP. P-phenylenediamine is also used as the raw material of cosmetic hair dye Urs D, gasoline polymerization inhibitor and developer.

●  Mainly used for fur dyeing, can also be co-dyed with other dyes, often used as mordant

●  Determination of ammonia, copper, gold, hydrogen sulfide, iron, magnesium, oxidants, ozone, sulfur dioxide and vanadium, determination of chromium. Fluorescent indicator for acid-base titration (pH≤3.1 without fluorescence, pH≥4.4 showing orange-yellow fluorescence). reducing agent.

Production method

●  It is derived from the reduction of p-nitroaniline with iron powder in an acidic medium. The iron powder was put into hydrochloric acid, heated to 90°C, and p-nitroaniline was added under stirring. After the addition, the reaction was carried out at 95-100 ° C for 0.5 h, and then concentrated hydrochloric acid was added dropwise to complete the reduction reaction. After cooling, neutralize to pH 7-8 with saturated sodium carbonate solution, filter while hot after boiling, and wash the filter cake with hot water. The filtrate and the washings were combined, concentrated under reduced pressure, crystallized by cooling or distilled under reduced pressure to obtain p-phenylenediamine with a yield of 95%.

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