What is para nitroaniline red?
What is para nitroaniline red?
Para Red (paranitraniline red, Pigment Red 1, C.I. 12070) is a dye. It was discovered in 1880 by von Gallois and Ullrich and was the first azo dye. It dyes cellulose fabrics a brilliant red color, but is not very fast. The dye can be washed away easily from cellulose fabrics if not dyed correctly.
How do you make a red para?
Dissolve 2.7 g of 2-naphthol in 50 ml of 2.5M NaOH solution, Cool the solution to 10 °C by adding crushed ice. Carefully pour this solution into the flask containing the remainder of the diazonium salt, while swirling.
Why is para red red?
Chemically, the dye is similar to Sudan I. The dye was discovered in 1880 by von Gallois and Ullrich, and was the first azo dye. It dyes cellulose fabrics a brilliant red, but is not very fast….
| Para Red | |
|---|---|
| Molecular formula | C16H11N3O3 |
| Appearance | Red solid |
| Melting point | 248 – 252 °C |
| Hazards |
What is the name for red azo dye?
The IUPAC name for red azo dye is p-N, N-dimethyl amino azo benzene.
What is para red used for?
Para Red is a biological stain. It is used as a fat soluble chemical dye and food additive. It is a banned colorant and a number of analytical techniques have been developed to detect it in food.
Why is Para Red suitable for dyeing clothes?
It dyes cellulose fabrics a brilliant red, but is not very fast. The dye can be washed away easily from cellulose fabrics if not dyed correctly. Throughout making Para Red, the solution will become acidic and basic.
What is the melting point of Para Red?
248-252° C
Melting Point : 248-252° C (lit.)
What kind of dye is para red dye?
?) Para Red ( paranitraniline red, Pigment Red 1, C.I. 12070) is a dye. Chemically, it is similar to Sudan I. It was discovered in 1880 by von Gallois and Ullrich and was the first azo dye. It dyes cellulose fabrics a brilliant red color, but is not very fast. The dye can be washed away easily from cellulose fabrics if not dyed correctly.
What kind of dye is nitroaniline used for?
It is a starting material for the synthesis of Para Red, the first azo dye: When heated with sulfuric acid, it polymerizes explosively into a rigid foam. Nitroaniline is a solvatochromic dye used for determining Kamlet-Taft solvent parameters.
How is the reduction of nitroaniline effected?
The reduction is effected using iron metal and by catalytic hydrogenation. It is a starting material for the synthesis of Para Red, the first azo dye: When heated with sulfuric acid, it polymerizes explosively into a rigid foam.
How to prepare Para Red for azo dye?
The reaction yielded the desired product, para red, a red colored dye with the use of p-nitroaniline and 2-naphthol. The second reaction with p-anisidine and 1-naphthol yielded a darker red colored azo dye solution.