• Isophthalic acid

Isophthalic acid

  • CasNo：121-91-5
  • Purity：99%

Product Details;

CasNo： 121-91-5

Molecular Formula： C8H6O4

Appearance： white to light yellow crytal power

Reputable factory supply Isophthalic acid 121-91-5 in stock with high standard

  • Molecular Formula:C8H6O4
  • Molecular Weight:166.133
  • Appearance/Colour:white to light yellow crytal power 
  • Vapor Pressure:0mmHg at 25°C 
  • Melting Point:341-343 °C(lit.) 
  • Refractive Index:1.5100 (estimate) 
  • Boiling Point:378.274 °C at 760 mmHg 
  • PKA:3.54(at 25℃) 
  • Flash Point:196.749 °C 
  • PSA：74.60000 
  • Density:1.451 g/cm3 
  • LogP:1.08300 

Isophthalic acid(Cas 121-91-5) Usage

Description Isophthalic acid (CAS: 121-91-5) is an aromatic dicarboxylic acid, specifically benzene-1,3-dicarboxylic acid. It is one of three position isomers of benzenedicarboxylic acid, with the carboxylic acid groups positioned at the 1 and 3 positions on a benzene ring. The other two isomers are phthalic acid (1,2-position) and terephthalic acid (1,4-position). Isophthalic acid is primarily used in the production of polyethylene terephthalate (PET) copolymer, especially for bottle resins and to a lesser extent in fibers.
Production Method Isophthalic acid is industrially produced through the oxidation of meta-xylene using oxygen, typically in the presence of a cobalt-manganese catalyst. This reaction occurs on a large scale, producing billions of kilograms annually. In laboratory settings, isophthalic acid can be synthesized using chromic acid as an oxidizing agent. Other methods include the oxidation of meta-bromobenzoate or potassium meta-sulphobenzoate.
Uses Isophthalic acid is used as a key component in the production of PET copolymers, especially for making bottle resins. Its inclusion in PET improves certain properties like flexibility and clarity. To a lesser extent, it is used in fibers and other polymers, where it enhances resistance to chemicals and solvents. Isophthalic acid is used to make resins that have excellent corrosion resistance and are used in coatings, paints, and adhesives. These resins find extensive use in protective coatings for metal and concrete surfaces.
Health Hazards Irritation: Prolonged exposure to isophthalic acid may cause mild to moderate irritation of the eyes, skin, and mucous membranes.
Ingestion: Ingesting isophthalic acid can lead to gastrointestinal irritation, though severe toxicity is rare.
Handling Precautions: Adequate ventilation, personal protective equipment (PPE), and dust control measures should be implemented when handling this compound due to its potential for causing irritation and its dust’s explosive nature.
Environmental Considerations Isophthalic acid is non-toxic to the environment under normal usage but should still be handled carefully to prevent accidental release, particularly in cases where dust can form explosive atmospheres.

InChI:InChI=1/C8H6O4/c9-7(10)5-2-1-3-6(4-5)8(11)12/h1-4H,(H,9,10)(H,11,12)/p-2

121-91-5 Relevant articles

A series of 1D, 2D and 3D coordination polymers based on a 5-(benzonic-4-ylmethoxy)isophthalic acid: syntheses, structures and photoluminescence

Ying-Ying Liu , Jing Li , Jian-Fang Ma *, Ji-Cheng Ma and Jin Yang *

, CrystEngComm, 2012, 14, 169-177

Seven new coordination polymers, namely, [Zn(HL)(H2O)] (1), [Zn(HL)(phen)]·1.5H2O (2), [Zn(HL)(L1)] (3), [Zn2(HL)2(L2)2]·2H2O (4), [Zn(HL)(L3)0.5] (5), [Zn(HL)(L4)] (6) and [Cu2(L)(OH)(H2O)]·0.5H2O (7) (H3L = 5-(benzonic-4-ylmethoxy) isophthalic acid, phen = 1,10-phenathroline, L1 = 1,2-bis(1,2,4-triazole-1-yl)ethane, L2 = 1,3-bis(1,2,4-triazole-1-yl)propane, L3 = 1,6-bis(1,2,4-triazole-1-yl)hexane and L4 = 4,4′-bis(1,2,4-triazole-1-ylmethyl)biphenyl), have been hydrothermally synthesized and characterized by single-crystal X-ray diffraction.

Fabrication of three dimensional (3D) hierarchical Ag/WO3 flower-like catalyst materials for the selective oxidation of m-xylene to isophthalic acid

Acharyya, Shankha S.,Ghosh, Shilpi,Bal, Rajaram

, p. 5998 - 6001 (2015)

A three dimensional (3D) hierarchical si...

Substituent effect on the assembly of coordination polymers containing isophthalic acid and its derivatives

Dong-Sheng Zhou,a   Fang-Kuo Wang,ab   Shi-Yao Yang,*a   Zhao-Xiong Xiea  and  Rong-Bin Huanga

, CrystEngComm, Issue 11, 2009

Four coordination polymers [Zn4(H2O)(ip)4(py)6]n1, {[Zn2(hip)2(py)4]2·(py)}n2, [Zn(tbip)(py)2]n3 and [Mn(tbip)(py)2]n4 (H2ip = isophthalic acid, H2hip = 5-hydroxyisophthalic acid, H2tbip = 5-tert-butylisophthalic acid, py = pyridine), have been hydrothermally synthesized and characterized. The substituents on isophthalic acid influence the coordination environments of metal ions and the coordination modes of the carboxyls, and thus determine the structures of the coordination polymers.

121-91-5 Process route

tetrachloromethane
56-23-5

tetrachloromethane

isophthalic acid
121-91-5

isophthalic acid

terephthalic acid
100-21-0

terephthalic acid

Conditions
Conditions Yield
With alkaline permanganate;
 
biphenyl-3,4′-dicarboxylic acid
92152-01-7

biphenyl-3,4′-dicarboxylic acid

isophthalic acid
121-91-5

isophthalic acid

terephthalic acid
100-21-0

terephthalic acid

Conditions
Conditions Yield
bei Oxydation;
 

121-91-5 Upstream products

  • 626-17-5
    626-17-5

    benzene-1,3-dicarbonitrile

  • 56-23-5
    56-23-5

    tetrachloromethane

  • 626-19-7
    626-19-7

    Isophthalaldehyde

  • 60-29-7
    60-29-7

    diethyl ether

121-91-5 Downstream products

  • 1459-93-4
    1459-93-4

    dimethyl Isophthalate

  • 952-08-9
    952-08-9

    1,3-bis(4,5-dihydro-1H-imidazol-2-yl)benzene

  • 636-53-3
    636-53-3

    diethyl isophthalate

  • 13111-32-5
    13111-32-5

    isophthalic acid dianilide

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