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C.I. Developer 21

naphthol as-D

CAS: 135-61-5

Molecular Formula: C18H15NO2

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C.I. Developer 21 - Names and Identifiers

Name naphthol as-D
Synonyms C.I. 37520
Naphtol AS-D
naphthol as-D
AcnaNaphtholE
Acna Naphthol E
C.I. Developer 21
Acco Naf-Sol AS-D
Acco Naphthol AS-D
Amanil Naphthol AS-D
Azoic coupling component 18
C.I. Azoic Coupling Component 18
2-Naphtho-o-toluidide, 3-hydroxy-
2-Hydroxy-3-Naphthoyl-O-Toluidine
C.I. Azoic Coupling Component 110
naphthol as-D type iii repurified
3-hydroxy-2-methyl-2-naphthanilide
1-(2',3'-Hydroxynaphthoylamino)-2-methylbenzene
3-hydroxy-n-(2-methylphenyl)-2-naphthalenecarboxamid
3-hydroxy-N-(2-methylphenyl)naphthalene-2-carboxamide
CAS 135-61-5
EINECS 205-205-0
InChI InChI=1/C18H15NO2/c1-12-6-2-5-9-16(12)19-18(21)15-10-13-7-3-4-8-14(13)11-17(15)20/h2-11,20H,1H3,(H,19,21)

C.I. Developer 21 - Physico-chemical Properties

Molecular FormulaC18H15NO2
Molar Mass277.32
Density1.277±0.06 g/cm3(Predicted)
Melting Point196-198°C
Boling Point399.7±35.0 °C(Predicted)
Flash Point195.5°C
Vapor Presure5.83E-07mmHg at 25°C
AppearancePale yellow powder
ColorWhite to Gray to Brown
pKa8.73±0.40(Predicted)
Storage ConditionRoom Temprature
Refractive Index1.715
MDLMFCD00021634
Physical and Chemical PropertiesCharacteristic beige powder.

melting point 195~196 ℃

solubility in solvent naphtha. Insoluble in water and soda ash solution.
UseMainly used for the production of insoluble azo dyes and used for cotton fiber, viscose fiber and some synthetic fiber dyeing and printing

C.I. Developer 21 - Risk and Safety

Hazard SymbolsN - Dangerous for the environment
Dangerous for the environment
Risk Codes50/53 - Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. 
Safety DescriptionS60 - This material and its container must be disposed of as hazardous waste.
S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. 
UN IDsUN 3077 9/PG 3
WGK Germany2
Hazard Class9
Packing GroupIII

C.I. Developer 21 - Upstream Downstream Industry

Raw Materialso-Toluidine
3-Hydroxy-2-naphthoic acid
o-Toluidine
Chlorobenzene
Phosphorus trichloride

C.I. Developer 21 - Reference Information

color index 37520
NIST chemical information Information provided by: webbook.nist.gov (external link)
EPA chemical information Information provided by: ofmpub.epa.gov (external link)
use mainly used for producing insoluble azo dyes and for dyeing and printing of cotton fibers, viscose fibers and some synthetic fibers
tryptopol AS-D is the main red primer for dyeing cotton fibers. The performance is similar to that of tryptopol AS, so it can be mixed to adjust the color light. Dye date red with red base B and rose red with red base RL. It is also used for dyeing vinylon, viscose fiber, silk and diacetate fiber. Chromophenol is AS-D used as a base agent for cotton printing. It can be combined with different color bases to obtain orange, red, purple and blue colors. Low affinity to cotton and moderate coupling ability. It is also used to make fast pigments and lake pigments.
It is mainly used as a primer for dyeing and printing of cotton fabrics, and can be used as an intermediate for fast pigments and organic pigments.
production method 2,3-acid is salted and dehydrated with chlorobenzene and sodium carbonate, then condensed with o-toluidine in the presence of phosphorus trichloride, neutralized with sodium carbonate, evaporated to chlorobenzene, filtered and dried to obtain the finished product. Raw material consumption (kg/t)2,3-acid 750 o-toluidine 430 chlorobenzene 200 sodium carbonate 450 450 phosphorus trichloride 280
using 2,3-acid and o-toluidine as raw materials, the 2,3-acid is first prepared into sodium salt in chlorobenzene medium, then condensed with o-toluidine in the presence of PCl3, neutralized, distilled, filtered and dried to obtain the finished product.. Add 4000-4500L of chlorobenzene, 2,3-acid 630kg (100%) and 280kg of sodium carbonate to the salt-forming pot, heat to 45 ℃, continue to raise the temperature to 134-135 ℃ after carbon dioxide escapes, continuously dehydrate, stop heating when the chlorobenzene to be distilled does not contain water, and the volume of feed liquid is about 2800-3000L. The above salt-forming reaction is hydraulically put into a condensation kettle, cooled to 90 ℃, o-toluidine 430kg (98%) is added, cooling to 65-70 ℃ is continued, phosphorus trichloride-chlorobenzene mixed solution (230kg PCl3 is prepared into 55%-60% mixed solution with anhydrous chlorobenzene) is added within 2 hours, and the temperature is kept at 119-120 ℃ for 2 hours after adding. Add 1000L of water and 330L of 30% sodium hydroxide solution in the distillation kettle, then press the above condensate, stir for 15min, and determine the pH value at 8-8.5. Then direct steam distillation is used until the distillate is clear and free of chlorobenzene. Add hot water above 90 ℃ until the volume of the material reaches about 5000L, filter, wash the filter cake with hot water above 90 ℃ until the filtrate is clarified, drain the water, and dry the finished product to about 885kg. In the condensation reaction, the solvent must be anhydrous (that is, the moisture content should be below 1%), and the hydrogen chloride must be fully eliminated, otherwise the product yield will be seriously affected.
Last Update：2024-04-09 02:00:06
C.I. Developer 21
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Jiangsu Pules Biotechnology Co.,Ltd.
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CAS: 135-61-5
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Product Name: 3-Hydroxy-2'-Methyl-2-Naphthanilide Visit Supplier Webpage Request for quotation
CAS: 135-61-5
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Jiangsu Pules Biotechnology Co.,Ltd.
Featured Products
Product Name: Acco Naphthol AS-D Request for quotation
CAS: 135-61-5
Tel: 17505222756
Email: pules.cn@gmail.com
Mobile: +86-17551318830
Wechat: 17505222756
Wuhan UCchem Biotechnology Co., LTD
Spot supply
Product Name: Acco Naphthol AS-D Request for quotation
CAS: 135-61-5
Tel: +86-18162425036
Email: 3866263148@qq.com
Mobile: 18162425036
QQ: 3866263148 Click to send a QQ messageSend QQ message
Wechat: 18162425036
Hefei TNJ Chemical Industry Co.,Ltd.
Product Name: naphthol as-D Request for quotation
CAS: 135-61-5
Tel: 0086-551-65418684
Email: sales@tnjchem.com
　　　　 info@tnjchem.com
Mobile: 0086 189 4982 3763
QQ: 2881500840 Click to send a QQ message
Wechat: 0086 189 4982 3763
WhatsApp: 0086 189 4982 3763
Product List: View Catalog
Shanghai Yuanye Bio-Technology Co., Ltd.
Product Name: 3-Hydroxy-2'-Methyl-2-Naphthanilide Visit Supplier Webpage Request for quotation
CAS: 135-61-5
Tel: 18301782025
Email: 3008007409@qq.com
Mobile: 18021002903
QQ: 3008007409 Click to send a QQ message
Wechat: 18301782025
View History
C.I. Developer 21
Raw Materials for C.I. Developer 21
o-Toluidine
3-Hydroxy-2-naphthoic acid
o-Toluidine
Chlorobenzene
Phosphorus trichloride
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