C.I. Basic Red 9, monohydrochloride (8CI)
Basic Red 9
CAS: 569-61-9
Molecular Formula: C19H17N3· HCl
C.I. Basic Red 9, monohydrochloride (8CI) - Names and Identifiers
C.I. Basic Red 9, monohydrochloride (8CI) - Physico-chemical Properties
| Molecular Formula | C19H17N3· HCl |
| Molar Mass | 323.82 |
| Density | 0.999 g/mL at 20 °C |
| Melting Point | 268-270℃ |
| Boling Point | 568.2°C at 760 mmHg |
| Flash Point | 297.4°C |
| Water Solubility | 10 g/L (25℃) |
| Solubility | ethanol: soluble1mg/mL |
| Vapor Presure | 6.33E-13mmHg at 25°C |
| Appearance | Solid |
| Color | metallic green |
| PH | 1.0 - 3.1, purple to red |
| Storage Condition | Store at RT. |
| Stability | Stable. Incompatible with strong oxidizing agents. |
| Refractive Index | n20/D 1.334 |
| MDL | MFCD00001657 |
| Use | Alkaline Red 9 is an alkaline fuchsin dye, which can not only be used as a dye, but also further manufacture various organic pigments for printing inks, paints and coatings. |
C.I. Basic Red 9, monohydrochloride (8CI) - Risk and Safety
| Risk Codes | R40 - Limited evidence of a carcinogenic effect R45 - May cause cancer R11 - Highly Flammable |
| Safety Description | S7 - Keep container tightly closed. S16 - Keep away from sources of ignition. S53 - Avoid exposure - obtain special instructions before use. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S36/37 - Wear suitable protective clothing and gloves. |
| UN IDs | UN 2924 3/PG 2 |
| WGK Germany | 3 |
| RTECS | CX9850000 |
| TSCA | Yes |
| HS Code | 32041300 |
C.I. Basic Red 9, monohydrochloride (8CI) - Upstream Downstream Industry
| Raw Materials | Aniline 4,4'-Methylenedianiline Nitrobenzene p-Toluidine |
| Downstream Products | Acid Blue 93 Solvent Violet 8 OPAL BLUE SS Solvent Blue 66 |
C.I. Basic Red 9, monohydrochloride (8CI) - Introduction
Soluble in ethanol is crimson, hot water is red, slightly soluble in cold water, insoluble in ether. It is yellow and brown in concentrated sulfuric acid, and purplish red after dilution. There have been reports of positive carcinogenic tests in experimental animals. Colour Index Number 42500
Last Update：2022-10-16 17:26:27
C.I. Basic Red 9, monohydrochloride (8CI) - Introduction
Alkaline Red 9 is a dye, a triphenylmethane dye, widely used in industrial printing and dyeing. Alkaline red 9 colorimetric method or pararosaniline colorimetric method is the most commonly used chemical method for the determination of sulfur dioxide in the atmosphere. The principle is that sulfur dioxide is absorbed by sodium mercury tetrachloride solution to form a stable complex, and then interact with formaldehyde and pararosaniline to form a rose purple compound, which is quantified according to its color depth.
uses alkaline red 9 is an alkaline fuchsin dye, which can not only be used as a dye, but also further manufacture various organic pigments for printing ink, paint and coating.
Preparation
The preparation method of alkaline red 9 is obtained by catalytic oxidation of methylene diphenylamine and aniline in air with a catalyst, including the following steps:
(1) Mix methylene diphenylamine and aniline with a weight ratio of 4:1 in a four-port flask to obtain mixture A; the four ports of the four-port flask are equipped with condensers, water separators, Thermometer and air introduction tube, with agitator in the four-port flask;
(2) Stir and dissolve mixture A in a concentration of 30% HCl to obtain solution B; where the concentration used is 0.6 times the weight of 30% HCl and the weight of methylene aniline;
(3) adding catalyst to solution B to obtain solution c, the weight of the catalyst is 1% of the weight of methylene aniline; the catalyst is a mixture of VF3 and MoO3 with a mass ratio of 1:3;
(4) introduce air into solution c while heating, keep the temperature at 100 ℃ and continue to introduce air for 30 hours until no water is generated and the reaction is over to obtain substance d;
(5) Carry out azeotropic distillation on substance D to remove and recover excess aniline to obtain crude product. Pour the crude product out of a four-mouth flask, and the crude product will cool and become brittle;
(6) Grind the crude product and stir and dissolve it with dilute hydrochloric acid solution to obtain solution E with PH≤ 1;
(7) after stirring the solution e for 7 hours, add diatomite to filter, take the filtrate to remove the filter residue, and obtain the solution f;
(8) neutralize solution f with 0.4mol/L NaOH solution to PH = 5 at a temperature of 23 ℃. after filtration, take filter cake to remove filtrate to obtain substance g;
(9) substance g is dissolved in boiling water with PH = 4, cooled to normal temperature for crystallization after 10 hours, and finally filtered. the solid product is alkaline red 9 crystal with a yield of 68%.
Use as a biological stain, and can be applied to spectrophotometric detection in analytical detection.
Use biostaining
Production method
1. Add aniline, diaminodiphenylmethane, aniline hydrochloride, nitrobenzene and powdered ferric chloride to the reactor in a certain proportion, and heat to 100 ℃ while stirring to make them mix into uniform oil. Continue to heat to 150 ℃ to keep reflux. At this time, water is steamed out. When the water is no longer steamed out, stop heating and add hot water, and then slowly add sodium hydroxide solution while it is hot until the red color of the water layer disappears, steam distillation distilled aniline, adding 30% hydrochloric acid to phenolphthalein alkaline distillate to slightly acidic, heated to boiling. Stop heating, add sodium carbonate to the filtered filtrate to dissolve
The red color of the liquid to the filtrate disappears, and the secondary magenta is precipitated, the secondary magenta is filtered out, washed with water, dissolved with ethanol after pressing dry, and concentrated sulfuric acid is added until the red strength does not increase, then heated to boiling, filtered while hot, and the filtrate is cooled and precipitated. The product is pure secondary magenta.
Last Update：2024-04-10 22:29:15
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Raw Materials for C.I. Basic Red 9, monohydrochloride (8CI)
Downstream Products for C.I. Basic Red 9, monohydrochloride (8CI)