ChemicalBook > CAS DataBase List > Isophthalic acid

Isophthalic acid

Product Name
Isophthalic acid
CAS No.
121-91-5
Chemical Name
Isophthalic acid
Synonyms
1,3-BENZENEDICARBOXYLIC ACID;Isophthalic;isophthalate;M-PHTHALIC ACID;1,3-phthalicacid;1,3-dicarboxybenzene;IPA)Isophthalic;sophthalic acid;ISOPHTHALIC ACID;META-PHTHALICACID
CBNumber
CB3262667
Molecular Formula
C8H6O4
Formula Weight
166.13
MOL File
121-91-5.mol
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Isophthalic acid Property

Melting point:
341-343 °C (lit.)
Boiling point:
214.32°C (rough estimate)
Density 
1,54 g/cm3
vapor pressure 
0Pa at 25℃
refractive index 
1.5100 (estimate)
storage temp. 
Sealed in dry,Room Temperature
solubility 
0.12g/l
form 
Crystalline Powder
pka
3.54(at 25℃)
color 
White to off-white
PH
3.33(1 mM solution);2.76(10 mM solution);2.24(100 mM solution)
Water Solubility 
0.01 g/100 mL (25 ºC)
Merck 
14,5197
BRN 
1909332
Dielectric constant
1.4（Ambient）
Stability:
Stable. Incompatible with strong oxidizing agents, strong bases.
InChIKey
QQVIHTHCMHWDBS-UHFFFAOYSA-N
LogP
1.66 at 25℃
CAS DataBase Reference
121-91-5(CAS DataBase Reference)
NIST Chemistry Reference
1,3-Benzenedicarboxylic acid(121-91-5)
EPA Substance Registry System
Isophthalic acid (121-91-5)
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Safety

Hazard Codes 
Xi
Risk Statements 
36/37/38
Safety Statements 
24/25-36-26
WGK Germany 
2
RTECS 
NT2007000
Autoignition Temperature
1198 °F
TSCA 
Yes
HS Code 
29173980
Hazardous Substances Data
121-91-5(Hazardous Substances Data)
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Warning
Hazard statements

H315Causes skin irritation

H319Causes serious eye irritation

H335May cause respiratory irritation

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

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N-Bromosuccinimide Price

Sigma-Aldrich
Product number
I19209
Product name
Isophthalic acid
Purity
99%
Packaging
2kg
Price
$98.9
Updated
2024/03/01
Sigma-Aldrich
Product number
42304
Product name
Isophthalic acid
Purity
analytical standard
Packaging
50mg
Price
$73.5
Updated
2022/05/15
TCI Chemical
Product number
I0155
Product name
Isophthalic Acid
Purity
>99.0%(GC)(T)
Packaging
25g
Price
$18
Updated
2024/03/01
TCI Chemical
Product number
I0155
Product name
Isophthalic Acid
Purity
>99.0%(GC)(T)
Packaging
500g
Price
$29
Updated
2024/03/01
Alfa Aesar
Product number
A14445
Product name
Isophthalic acid, 99%
Packaging
250g
Price
$23.3
Updated
2024/03/01
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Isophthalic acid Chemical Properties,Usage,Production

Description

Isophthalic acid is an organic compound with the formula C6H4(CO2H)2. This colourless solid is an isomer of phthalic acid and terephthalic acid. These aromatic dicarboxylic acids are used as precursors (in form of acyl chlorides) to commercially important polymers, e.g. the fire-resistant material Nomex. Mixed with terephthalic acid, iso phthalic acid is used in the production of resins for drink bottles. The high-performance polymer poly benzimidazole is produced from iso phthalic acid.

Chemical Properties

Isophthalic acid is a white crystalline powder or needle-like crystals and it’s an isomer of phthalic acid and terephthalic acid.It is insoluble in cold water but soluble in oxygenated solvents and alcohol. It is combustible and finely dispersed particles will form explosive mixtures in air.

Isophthalic Acid (PIA) is mainly used in the production of bottle PET, also used in the production of alkyd resin, polyester resin, also used in the production of photosensitive materials, pharmaceutical intermediates and so on.
One of the largest applications for PIA is in unsaturated polyester resins for high-quality gel coats. The hardness, stain and detergent resistance characteristics of PIA are ideal for polyester solid-surface countertops that are an inexpensive alternative to acrylics.

Uses

Isophthalic acid is used as an intermediate for high performance unsaturated polyesters, resins for coatings, high solids paints, gel coats and modifier of polyethylene terephthalate for bottles. It acts as precursors for the fire-resistant material nomex as well as used in the preparation of high-performance polymer polybenzimidazole. It is also employed as an input for the production of insulation materials.

Uses

Purified Isophthalic Acid (PIA) is mainly used as intermediate for high performance UPR, resins for coatings, high solids paints, gel coats, modifier of PET for bottles. Product Data Sheet

Definition

ChEBI: A benzenedicarboxylic acid that is benzene substituted by carboxy groups at position 1 and 3. One of three possible isomers of benzenedicarboxylic acid, the others being phthalic and terephthalic acids.

Preparation

Iso phthalic acid is produced on the billion kilogram per year scale by oxidizing meta-xylene using oxygen . The process employs a cobalt-manganese catalyst. In the laboratory, chromic acid can be used as the oxidant. It also arises by fusing potassium meta-sulpho benzoate , or meta - brom benzoate with potassium formate (terephthalic acid is also formed in the last case).
The barium salt (as its hexa hydrate) is very soluble (a distinction between phthalic and terephthalic acids). Uvitic acid, 5- methylisophthalic acid, is obtained by oxidizing mesitylene or by condensing pyroracemic acid with baryta water.

Synthesis Reference(s)

Journal of the American Chemical Society, 82, p. 1911, 1960 DOI: 10.1021/ja01493a020

General Description

White solid with a slight unpleasant odor. Sinks in water.

Air & Water Reactions

Dust forms explosive mixture in air [USCG, 1999].

Reactivity Profile

Isophthalic acid is a carboxylic acid. Carboxylic acids donate hydrogen ions if a base is present to accept them. They react in this way with all bases, both organic (for example, the amines) and inorganic. Their reactions with bases, called "neutralizations", are accompanied by the evolution of substantial amounts of heat. Neutralization between an acid and a base produces water plus a salt. Carboxylic acids with six or fewer carbon atoms are freely or moderately soluble in water; those with more than six carbons are slightly soluble in water. Soluble carboxylic acid dissociate to an extent in water to yield hydrogen ions. The pH of solutions of carboxylic acids is therefore less than 7.0. Many insoluble carboxylic acids react rapidly with aqueous solutions containing a chemical base and dissolve as the neutralization generates a soluble salt. Carboxylic acids in aqueous solution and liquid or molten carboxylic acids can react with active metals to form gaseous hydrogen and a metal salt. Such reactions occur in principle for solid carboxylic acids as well, but are slow if the solid acid remains dry. Even "insoluble" carboxylic acids may absorb enough water from the air and dissolve sufficiently in Isophthalic acid to corrode or dissolve iron, steel, and aluminum parts and containers. Carboxylic acids, like other acids, react with cyanide salts to generate gaseous hydrogen cyanide. The reaction is slower for dry, solid carboxylic acids. Insoluble carboxylic acids react with solutions of cyanides to cause the release of gaseous hydrogen cyanide. Flammable and/or toxic gases and heat are generated by the reaction of carboxylic acids with diazo compounds, dithiocarbamates, isocyanates, mercaptans, nitrides, and sulfides. Carboxylic acids, especially in aqueous solution, also react with sulfites, nitrites, thiosulfates (to give H2S and SO3), dithionites (SO2), to generate flammable and/or toxic gases and heat. Their reaction with carbonates and bicarbonates generates a harmless gas (carbon dioxide) but still heat. Like other organic compounds, carboxylic acids can be oxidized by strong oxidizing agents and reduced by strong reducing agents. These reactions generate heat. A wide variety of products is possible. Like other acids, carboxylic acids may initiate polymerization reactions; like other acids, they often catalyze (increase the rate of) chemical reactions.

Health Hazard

May cause slight to moderate irritation of eyes, skin, and mucous membranes on prolonged contact. Ingestion may cause gastrointestinal irritation.

Fire Hazard

Behavior in Fire: Dust forms explosive mixture in air.

Flammability and Explosibility

Non flammable

Purification Methods

Crystallise the acid from aqueous EtOH. [Beilstein 9 IV 3292.]

Isophthalic acid Preparation Products And Raw materials

Raw materials

Cobalt acetate 1,3-Dicyanobenzene m-Xylene MANGANESE(II) ACETATE TETRAHYDRATE Potassium permanganate Acetic acid

Preparation Products

5-Amino-2,4,6-triiodo-N-methylisophthalamic Acid 2,4,5-Trifluorobenzoic acid DIETHYL ISOPHTHALATE 2-Iodoxybenzoic acid 1,3-Dicyanobenzene 2,6-Dicyano-4-Nitroaniline 5-AMINO-N-METHYLISOPHTHALAMIC ACID Dimethyl isophthalate 5-Nitroisophthalic acid polyester fibre coloring modifier Sodium dimethyl 5-sulphonatoisophthalate
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Isophthalic acid Suppliers

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View Lastest Price from Isophthalic acid manufacturers

Hebei Saisier Technology Co., LTD
Product
Isophthalic acid 121-91-5
Price
US $6.00/KG
Min. Order
1KG
Purity
More than 99%
Supply Ability
2000KG/Month
Release date
2024-04-25
Hebei Mujin Biotechnology Co.,Ltd
Product
Isophthalic acid 121-91-5
Price
US $0.00/KG
Min. Order
1KG
Purity
99%
Supply Ability
50000KG/month
Release date
2023-06-25
Hebei Zhuanglai Chemical Trading Co.,Ltd
Product
Isophthalic acid 121-91-5
Price
US $60.00/kg
Min. Order
1kg
Purity
99
Supply Ability
5000
Release date
2024-05-15

121-91-5, Isophthalic acidRelated Search:

3-(Trifluoromethyl)cinnamic acid Folic acid Bis(2-ethylhexyl) phthalate 5-Hydroxyisophthalic acid Citric acid Ethyl 2-(Chlorosulfonyl)acetate Terephthalic acid Metaraminol bitartrate Phthalic acid Diethyl phthalate Benzyl butyl phthalate Dacthal Dimethyl isophthalate Diisobutyl phthalate Hyaluronic acid Potassium hydrogen phthalate 5-Aminoisophthalic acid Stearic acid

  • RARECHEM AL BO 0036
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