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Isophthalic acid CAS NO.121-91-5

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  • Isophthalic acid
  • 99% Isophthalic acid
  • 121-91-5

Quick Details

  • ProName: Isophthalic acid
  • CasNo: 121-91-5
  • Molecular Formula: C8H6O4
  • Appearance: White to off-white crystalline powder
  • Application: Purified Isophthalic Acid (PIA) is mai...
  • DeliveryTime: 5-7 working days
  • PackAge: As customer request
  • Port: Qingdao/Shanghai
  • ProductionCapacity: 20 Metric Ton/Month
  • Purity: 99%
  • Storage: Store below +30°C
  • Transportation: By Sea/Air/DHL/TNT/UPS
  • LimitNum: 1 Kilogram


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Isophthalic acid

[Product Name]:Isophthalic acid







[Package]:as customer request

[Customer Request]: Available

[Usage]: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

Isophthalic acid Chemical Properties

Melting point 341-343 °C(lit.)
Boiling point 214.32°C (rough estimate)
density 1,54 g/cm3
refractive index 1.5100 (estimate)
storage temp. Store below +30°C.
solubility 0.12g/l
form Crystalline Powder
pka 3.54(at 25℃)
color White to off-white
Water Solubility 0.01 g/100 mL (25 ºC)
Merck 14,5197
BRN 1909332
Stability: Stable. Incompatible with strong oxidizing agents, strong bases.
CAS DataBase Reference 121-91-5(CAS DataBase Reference)
NIST Chemistry Reference 1,3-Benzenedicarboxylic acid(121-91-5)
EPA Substance Registry System 1,3-Benzenedicarboxylic acid(121-91-5)

Safety Information

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

Isophthalic acid Usage And Synthesis

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

Isophthalic acid Preparation Products And Raw materials

Preparation Products 1,3-Dicyanobenzene-->2-Iodoxybenzoic acid-->Sodium dimethyl 5-sulphonatoisophthalate-->2,6-Dicyano-4-Nitroaniline-->Dimethyl isophthalate-->2,4,5-Trifluorobenzoic acid-->5-AMINO-N-METHYLISOPHTHALAMIC ACID-->5-Nitroisophthalic acid-->5-AMINO-2,4,6-TRIIODO-N-METHYLISOPHTHALAMIC ACID (50 MG)-->DIETHYL ISOPHTHALATE-->polyester fibre coloring modifier
Raw materials Acetic acid glacial-->Potassium permanganate-->m-Xylene-->Cobalt acetate-->1,3-Dicyanobenzene-->MANGANESE(II) ACETATE TETRAHYDRATE

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