CI 42755

• Catalog Number: ACM28631665
• Product Name: CI 42755
• CAS: 28631-66-5
• Category: Acid Dyes
• Description: Water blue is an organic sodium salt resulting from the formal condensation of NSC 56820 with 2 mol eq. of sodium hydroxide.
• Synonyms: MARINE BLUE, NSC8677, ANILINE BLUE, WATER SOLUBLE, CID407402, ZINC04261931, 28631-66-5
• IUPAC Name: 4-[[4-(anilino)phenyl]-(4-phenyliminocyclohexa-2,5-dien-1-ylidene)methyl]-2-methylaniline
• Molecular Weight: 737.73
• Molecular Formula: C32H25N3O9S3.2Na
• Canonical SMILES: CC1=CC(=CC(=C1N)S(=O)(=O)[O-])C(=C2C=CC(=NC3=CC=C(C=C3)S(=O)(=O)O)C=C2)C4=CC=C(C=C4)NC5=CC=C(C=C5)S(=O)(=O)[O-].[Na+].[Na+]
• InChI: InChI=1S/C32H27N3O9S3.2Na/c1-20-18-23(19-30(32(20)33)47(42,43)44)31(21-2-6-24(7-3-21)34-26-10-14-28(15-11-26)45(36,37)38)22-4-8-25(9-5-22)35-27-12-16-29(17-13-27)46(39,40)41;;/h2-19,34H,33H2,1H3,(H,36,37,38)(H,39,40,41)(H,42,43,44);;/q;2*+1/p-2
• InChI Key: LBLFVSANTXZPEX-UHFFFAOYSA-N
• Appearance: Dark reddish-brown or blue crystals
• Application: It is used as a histological stain for collagen and in Mallory's method for connective tissue. It has a role as a histological dye.
• Storage: Store at +15°C to +30°C.
• EC Number: 249-113-9
• Exact Mass: 737.05481
• Hazard Codes: Xi: Irritant
• H-Bond Acceptor: 3
• H-Bond Donor: 2
• HTS Code: 32041200
• MDL Number: MFCD00036130
• PSA: 244.32
• XLogP3: 8.9729

Case Study

Electrochemical Oxidation Removal Method of Acid Blue 22

Panizza, et al. Journal of hazardous materials, 2008, 153 (1-2), 83-88.

Acid blue 22 is a triarylmethane dye containing many aromatic rings and sulfonic acid groups. Electrochemical oxidation methods have been used to treat acid blue22. Using boron-doped diamond electrode (BDD) as anode material, the removal capability and mechanism of acid blue 22 in wastewater via electrochemical oxidation were explored.
· A polymeric film, which caused electrode fouling, developed during oxidation in the potential region of water stability, which could be removed by high-potential anodic polarisation in the region of O2 evolution.
· Complete COD and colour removal was obtained within the investigated range regardless of current density, flow rate, temperature, and initial dye concentration, due to the formation of hydroxyl radicals from the water discharge.
· The oxidation rate was significantly affected by electrolyte flow rate and dye concentration, meaning that oxidation was under mass-transport control.
· High temperatures improve chemical decomposition of electrogenerated peroxodisulphate, thus decreasing the global oxidation rate.

The Removal of Aniline Blue Through Nanofiltration Composite Membrane

Shao L, et al. Journal of Membrane Science, 2013, 430, 96-105.

Acid blue 22, also known as aniline blue, is a common component of dyeing industrial wastewater. A novel thin film composite (TFC) nanofiltration (NF) membrane was developed through interfacial polymerization (IP) on the lumen side of a hollow fiber-supported membrane, which can be used to remove typical dyes from aqueous solutions, including aniline blue and Safranin O.
The adsorption effect for aniline blue
· The molecular weight of aniline blue is 753.8 g mol-1, which is greater than the molecular weight cut-off of the fabricated membrane. In addition, aniline blue dye is charged, and the three-dimensional size of the dye after ionization is expected to be 1.50×1.38×0.53 nm3.
· For the separation of aniline blue dye from aqueous solution, the rejection rate depends not only on the pore size but also on the influence of electrostatic forces between the membrane and the dye.
· The NF membrane has a rejection rate of aniline blue higher than 90% under appropriate conditions, and the flux of the dye solution increases with the increase of operating pressure and decreases with the increase of feed concentration.