C.I. Vat Yellow 2
Vat Yellow GCN
CAS: 129-09-9
Molecular Formula: C28H14N2O2S2
C.I. Vat Yellow 2 - Names and Identifiers
| Name | Vat Yellow GCN |
| Synonyms | C.I. 67300 VAT YELLOW 2 Vat Yellow GCN C.I.Vat Yellow Vat Yellow 2 ahcovatflavonegc ahcovatflavonegcn C.I. Vat Yellow 2 Vat Yellow 2(67300) Indanthrene yellow GCN INDANTHRENE YELLOW GCN |
| CAS | 129-09-9 |
| EINECS | 204-931-5 |
| InChI | InChI=1/C28H14N2O2S2/c31-23-18-12-14-20-26(34-28(30-20)16-9-5-2-6-10-16)22(18)24(32)17-11-13-19-25(21(17)23)33-27(29-19)15-7-3-1-4-8-15/h1-14H |
C.I. Vat Yellow 2 - Physico-chemical Properties
| Molecular Formula | C28H14N2O2S2 |
| Molar Mass | 474.55 |
| Density | 1.2270 (rough estimate) |
| Boling Point | 727.3°C at 760 mmHg |
| Flash Point | 393.6°C |
| Solubility | Sulfuric Acid (Slightly) |
| Vapor Presure | 5.25E-21mmHg at 25°C |
| Appearance | Solid |
| Color | Very Dark Yellow to Very Dark Brown |
| Storage Condition | Room Temperature |
| Refractive Index | 1.6360 (estimate) |
| Physical and Chemical Properties | Yellow-brown powder. Insoluble in water and ethanol. Yellow in concentrated sulfuric acid, purple in alkaline powder solution. |
| Use | For cotton, silk color matching and printing, can also be used for viscose, polyester/cotton and cotton/cotton dyeing |
C.I. Vat Yellow 2 - Upstream Downstream Industry
C.I. Vat Yellow 2 - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| introduction | reduced yellow 2 is also called reduced yellow GCN and ashilin yellow. it is mainly used for color matching and printing of cotton and silk fabrics, and can also be used for dyeing of viscose, polyester/cotton and vitamin/cotton. Reduced yellow 2 is a yellow dye with good levelness and bright color, which is insoluble in water and ethanol. It is yellow in concentrated sulfuric acid and purple in alkaline sodium hydrosulfite solution. |
| application | reduced yellow 2 can be used for color matching and printing of cotton and silk fabrics, and can also be used for dyeing of viscose, polyester/cotton and vitamin/cotton. it is usually combined with reduced blue GCDN, reduced blue BCS and reduced green FFB, reduced green B, reduced green 2G, etc. In the thread industry, various light to medium colors can be dyed, such as light green, fruit green, light gray, medium gray, light brown, medium brown, dark brown, etc. |
| preparation | (1) sulfonation: 400kg of anthraquinone, 250kg of sodium sulfate and 1200kg of 105% fuming sulfuric acid are put in, 1.7kg of catalyst is made from kaolin under high temperature baking at 1200 ℃ for directional catalysis, the reaction is heated to 130 ℃ in a 2500-3500L reaction pot, and the temperature is kept for 4 hours, then cool down to 40 ℃, put into a dilution pot, add 2000kg of water to dilute, and then add ammonia water to neutralize to pH7; The ratio of anthraquinone 2,6-bissulfonic acid ammonia salt and anthraquinone 2,7-bissulfonic acid ammonia salt reached 60wt%:40wt%. (2) Ammoniation: including putting 350kg of 2,6-bissulfonic acid ammonia salt, 200kg of anti-dyeing salt S,200kg of liquid ammonia and 1800kg of deionized water into a high-pressure reaction pot for reaction, heating to 170 ℃ for reaction, and keeping the temperature for 30-35 hours; After the reaction, 2, 6-diaminoanthraquinone is produced. (3) Synthesis: 70kg of 2,6-diaminoanthraquinone, 200kg of trichlorotoluene, 380kg of refined naphthalene (solvent),0.1kg of cuprous chloride and 50kg of sulfuric acid are put into a 650L reaction pot for reaction, and the reaction is carried out at 210 ℃ for 7 hours. Then thermal filtration is carried out when the reaction material is cooled by 100 ℃, filtration obtained crude reduced yellow GCN, filtrate containing naphthalene residue and unreacted trichlorotoluene, and then distilled to recover naphthalene and trichlorotoluene under the pressure of-0.3Mpa. (4) Refining: First, the crude reduced yellow GCN is put into sulfuric acid and heated to 140 ℃ for 3 hours for refining, then diluted and filtered, then beaten and added with sodium hypochlorite for oxidation, and finally the reduced yellow 2 is filtered with acid-resistant and high-temperature resistant 1000 mesh filter paper and cotton filter cloth. |
| use | reduced yellow GCN is used for dyeing and printing of cotton, viscose fiber, silk and vitamin/cotton blended fabrics with good affinity and levelness. It is usually combined with reduced blue GCDN, reduced blue BCS and reduced green FFB, reduced green B, reduced green 2G, etc. to dye various colors of green. In the thread industry, various light to medium colors can be dyed, such as light green, fruit green, light gray, medium gray, light brown, medium brown, dark brown, etc. It is used for color matching and printing of cotton and silk fabrics, and can also be used for dyeing viscose, polyester/cotton and vitamin/cotton |
| production method | using 2,6-diaminoanthraquinone, omega-trichlorotoluene, and sulfur as raw materials, using cuprous chloride as a catalyst, the product is condensed in molten refined naphthalene, and the finished product is obtained by acid treatment, oxidation, filtration, crushing, and drying.. 31.6kg 2,6-diaminoanthraquinone (100%), 70kg omega-trichlorotoluene (100%), 13.5kg of sulfur, 0.27kg of cuprous chloride and 100kg of refined naphthalene are heated to 185 ℃ for 6 hours, then heated to 225 ℃, then naturally cooled to 180 ℃, then added 50kg of refined naphthalene, and filtered while hot at 140 ℃. The filter cake is washed with 200kg refined naphthalene in 2-3 times, and the filter cake is dried and crushed. The crushed filter cake is treated with 450kg of industrial sulfuric acid and 4500L of water for acid treatment, then filtered, and the filter cake is washed to neutral. Take the neutral warm filter cake and beat it with 200kg of water, then add 100kg of sodium hypochlorite solution (10%), raise the temperature to 70 ℃ for oxidation for 1h, adjust pH = 8, filter, wash with water until neutral, dry and grind to obtain the finished product. |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 21:01:54
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Raw Materials for C.I. Vat Yellow 2