Basic information Safety Supplier Related
ChemicalBook >  Product Catalog >  Dyes and Pigments >  dye >  Acid dye >  Eriochrome Black T

Eriochrome Black T

Basic information Safety Supplier Related

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
More
Less

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)
More
Less

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
More
Less

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 TSupplier

J & K SCIENTIFIC LTD.
Tel
010-82848833- ;010-82848833-
Email
jkinfo@jkchemical.com;market6@jkchemical.com
Meryer (Shanghai) Chemical Technology Co., Ltd.
Tel
21-61259100-
Email
sh@meryer.com
Alfa Aesar
Tel
400-610-6006; 021-67582000
Email
saleschina@alfa-asia.com
TCI (Shanghai) Development Co., Ltd.
Tel
021-67121386 / 800-988-0390
Email
Sales-CN@TCIchemicals.com
Beijing dtftchem Technology Co., Ltd.
Tel
13651141086; 86(10)60275028、60275820
Email
dtftchem@sina.com