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이소프탈산 구조식 이미지
카스 번호:
Isophthalic acid
Isophthalic;isophthalate;IPA)Isophthalic;M-PHTHALIC ACID;1,3-phthalicacid;ISOPHTHALIC ACID;META-PHTHALICACID;acideisophtalique;Acide isophtalique;kyselinaisoftalova
포뮬러 무게:
MOL 파일:

이소프탈산 속성

341-343 °C(lit.)
끓는 점
214.32°C (rough estimate)
1,54 g/cm3
1.5100 (estimate)
저장 조건
Store below +30°C.
물리적 상태
Crystalline Powder
산도 계수 (pKa)
3.54(at 25℃)
White to off-white
0.01 g/100 mL (25 ºC)
Stable. Incompatible with strong oxidizing agents, strong bases.
CAS 데이터베이스
121-91-5(CAS DataBase Reference)
1,3-Benzenedicarboxylic acid(121-91-5)
1,3-Benzenedicarboxylic acid(121-91-5)


위험품 표기 Xi
위험 카페고리 넘버 36/37/38
안전지침서 24/25-36-26
WGK 독일 2
RTECS 번호 NT2007000
자연 발화 온도 1198 °F
HS 번호 29173980
유해 물질 데이터 121-91-5(Hazardous Substances Data)

이소프탈산 MSDS

1,3-Benzenedicarboxylic acid

이소프탈산 C화학적 특성, 용도, 생산


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.

화학적 성질



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

제조 방법

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.


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.

일반 설명

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

공기와 물의 반응

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

반응 프로필

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.


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


Behavior in Fire: Dust forms explosive mixture in air.

Purification Methods

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

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