Eriochrome Black T
Eriochrome Black T Basic information
- Product Name:
- Eriochrome Black T
- Synonyms:
-
- 1-naphthalenesulfonicacid,3-hydroxy-4-((1-hydroxy-2-naphthalenyl)azo)-7-nitro
- 1-naphthalenesulfonicacid,3-hydroxy-4-[(1-hydroxy-2-naphthalenyl)azo]-7-nitro
- 1-Naphthalenesulfonicacid,3-hydroxy-4-[(1-hydroxy-2-naphthalenyl)azo]-7-nitro-,monosodiumsalt
- abcolchromeblacktn
- abcolchromenavyrzn
- acidchromeblacket
- chromogeneblackt160
- czernkwasowo-chromowaetn
- CAS:
- 1787-61-7
- MF:
- C20H12N3NaO7S
- MW:
- 461.38
- EINECS:
- 217-250-3
- Product Categories:
-
- Dyes and Pigments
- Analytical Chemistry
- Azo Compounds
- Chelating Reagents
- Naphthylazo Compounds
- Mol File:
- 1787-61-7.mol
Eriochrome Black T Chemical Properties
- Density
- 1.109 g/mL at 25 °C
- Flash point:
- 185 °C
- storage temp.
- room temp
- solubility
- 50g/l
- form
- Powder/Solid
- pka
- pK1:6.3;pK2:11.55 (25°C)
- Colour Index
- 14645
- color
- Brownish-black to black
- Specific Gravity
- 1.109
- Odor
- Odorless
- PH
- 3.7 (10g/l, H2O, 20℃)
- Water Solubility
- 50 g/L (20 ºC)
- Merck
- 14,3667
- BRN
- 4121162
- Stability:
- Stable. Incompatible with strong oxidizing agents, strong reducing agents.
- CAS DataBase Reference
- 1787-61-7(CAS DataBase Reference)
- EPA Substance Registry System
- C.I. Mordant Black 11, monosodium salt (1787-61-7)
Safety Information
- Hazard Codes
- Xi
- Risk Statements
- 36-36/37/38-36/38
- Safety Statements
- 39-26-37/39-24/25
- RIDADR
- 3077
- WGK Germany
- 2
- RTECS
- QK2197000
- TSCA
- Yes
- HazardClass
- 6.1
- PackingGroup
- III
- HS Code
- 32041900
- Toxicity
- LD50 oral in rat: 17590mg/kg
MSDS
- Language:English Provider:C.I. 14645
- Language:English Provider:ACROS
- Language:English Provider:ALFA
Eriochrome Black T Usage And Synthesis
Chemical Properties
black powder
Uses
To dye wool from an acid bath reddish-black, which can be converted to blue-black by afterchroming. As indicator in the determination of the total calcium and magnesium content of water.
Preparation
4-Amino-3-hydroxy-7-nitronaphthalene-1-sulfonic acid diazotization, and Naphthalen-1-ol?coupling.
Properties and Applications
blue black. Dark brown powder. Soluble in water for bordeaux red to jam red, moderate soluble in ethanol for brown light magenta, slightly soluble in Acetone. Dye in concentrated sulfuric acid for skipper, dilution to pale red light brown; In concentrated nitric acid to orange. Dye aqueous solution to join concentrated hydrochloric acid for sauce red; Join strong caustic into brown light magenta. Mainly used for all kinds of wool fabric dyeing, also used for silk, nylon and wool and a variety of fiber blended fabric dyeing, can be in chrome pretreatment of wool fabric direct printing. Is tasted can be used for indicator, also can be used for biological and fur dyeing.
| Standard | Ironing Fastness | Light Fastness | Fulling | Persperation Fastness | Soaping | Water | |
| Alkali | Acid | ||||||
| ISO | 4-5 | 7 | 5 | 5 | 5 | 5 | 5 |
| AATCC | 4-5 | 7 | 4-5 | 5 | 5 | 5 | |
Purification Methods
The sodium salt (200g) is converted to the free acid by stirring with 500mL of 1.5M HCl, and, after several minutes, the slurry is filtered on a sintered-glass funnel. The process is repeated and the material is air dried after washing with acid. It is then extracted with *benzene for 12hours in a Soxhlet extractor, the *benzene solution is evaporated and the residue is air dried. A further desalting with 1.5M HCl (1L) is followed by crystallisation from dimethylformamide (in which it is very soluble) by forming a saturated solution at the boiling point, and allowing to cool slowly. The crystalline dimethylammonium salt so obtained is washed with *benzene and treated repeatedly with dilute HCl to give the insoluble free acid which, after air drying, is dissolved in alcohol, filtered and evaporated. The final material is air dried, then dried in a vacuum desiccator over Mg(ClO4)2. The purified acid is converted to the dimethylammonium salt with Me2NH. [Diehl & Lindstrom, Anal Chem 31 414 1959]. It is an indicator in the complexometry of alkaline earth metals. [Beilstein 16 IV 429.]
Eriochrome Black T Preparation Products And Raw materials
Preparation Products
Raw materials
Eriochrome Black TSupplier
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Eriochrome Black T(1787-61-7)Related Product Information
- 4-Amino-benzenesulfonic acid monosodium salt
- 4-Aminothiophenol
- 1-Naphthalenesulfonic acid
- Nitrosobenzene
- NITROGEN DIOXIDE
- BLACKBERRY
- Mordant Red 19
- BLACKEYEDPEAS
- Eriochrome Black T
- Acid Black 26
- CHLOROPHOSPHONAZO III
- Acid Black ATT
- Naphthalene
- Black
- ERIOCHROME BLACK A
- Acid Black 2
- SULFONIC ACID
- Mordant Black 17