3520-72-7

Basic information

• Product Name: Pigment Orange 13
• Synonyms: C.I. 21110;4,4'-[(3,3'-Dichloro[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-one];PIGMENT ORANGE 13;PYRAZOLONE ORANGE;4-dihydro-5-methyl-2-phenyl-;atulvulcanfastpigmentorangeg;benzidineorange;benzidineorange45-2850
• CAS NO: 3520-72-7
• Molecular Formula: C₃₂H₂₄Cl₂N₈O₂
• Molecular Weight: 623.49
• EINECS: 222-530-3
• Product Categories: Dyes and Pigments;Organics
• Mol File: 3520-72-7.mol
• Article Data: 2

Chemical Properties

• Boiling Point: 825.5 °C at 760 mmHg
• Flash Point: 453.1 °C
• Appearance: brown powder
• Density: 1.5522 (rough estimate)
• Vapor Pressure: 2.19E-27mmHg at 25°C
• Refractive Index: 1.6100 (estimate)
• Storage Temp.: Room Temperature, under inert atmosphere
• PKA: 1.55±0.70(Predicted)
• CAS DataBase Reference: Pigment Orange 13(CAS DataBase Reference)
• NIST Chemistry Reference: Pigment Orange 13(3520-72-7)
• EPA Substance Registry System: Pigment Orange 13(3520-72-7)

Safety Data

• Statements: 20/21/22-36/37/38
• Safety Statements: 26-36/37/39
• Hazardous Substances Data: 3520-72-7(Hazardous Substances Data)

Usage

Uses

Pigment Orange 13 is a dye used in textiles and commercial industries. Used in the preparation of light-protective containers.

Properties and Applications

TEST ITEMS SPECIFICATION APPEARANCE ORANGE POWDER SHADE REDDISH HEAT RESISTANCE 180 °C min LIGHT FASTNESS 6-7 ACID RESISTANCE 5 ALKALI RESISTANCE 4 FASTNESS TO BLEEDING 5 OIL ABSORPTION 35-50% SPECIFIC SURFACE 27 m 2 /g DENSITY 1.50 g/cm 3 RESIDUE ON 80 MESH 5.0% max WATER SOLUBLE 1.0% max VOLATITE 105 °C 1.0% max TINTING STRENGTH 100-105 %

TEST ITEMS

SPECIFICATION

APPEARANCE

ORANGE POWDER

SHADE

REDDISH

HEAT RESISTANCE

180 °C min

LIGHT FASTNESS

6-7

ACID RESISTANCE

5

ALKALI RESISTANCE

4

FASTNESS TO BLEEDING

5

OIL ABSORPTION

35-50%

SPECIFIC SURFACE

27 m 2 /g

DENSITY

1.50 g/cm 3

RESIDUE ON 80 MESH

5.0% max

WATER SOLUBLE

1.0% max

VOLATITE 105 °C

1.0% max

TINTING STRENGTH

100-105 %

InChI:InChI=1/C32H24Cl2N8O2/c1-19-29(31(43)41(39-19)23-9-5-3-6-10-23)37-35-27-15-13-21(17-25(27)33)22-14-16-28(26(34)18-22)36-38-30-20(2)40-42(32(30)44)24-11-7-4-8-12-24/h3-18,29-30H,1-2H3/b37-35+,38-36+

Upstream product

• 19735-89-8 3-methyl-1-phenylpyrazolin-5(4H)-one 
• 91-94-1 3,3'-dichlorobenzidine 
• 89-25-8 edaravone 

Relevant articles and documents

A quantitative one-pot synthesis method for industrial azo pigments with recyclable wastewater

Most industrial azo pigments are synthesized by diazotization in one pot and then coupling in another. This two-pot process has been transformed into a one-pot method by adding granular PTFE (polytetrafluoroethylene) to a mechanically agitated aqueous mixture of NaNO2, HCl, a diazo component and a coupling component. This method avoids the step of using a base or a surfactant to dissolve the coupling component. The reactions were fast and quantitative. The granular PTFE, wastewater and excess HCl were then reused 11 times without deteriorating the reaction rate and product purity. Altogether, 22 industrial pigments and 3 azo compounds were synthesized and the reaction can produce up to 22.7 g of product in the laboratory. Some reactions require less than 2 equiv. of HCl and a mechanism explaining this is proposed. In addition, an o-nitro group effect is advanced to explain the differences in coupling reaction rates for o-, m- and p-nitroaniline.