7717-76-2

Basic information

• Product Name: 4-(3,4-dicarboxyphenoxy)benzene-1,2-dicarboxylic acid
• Synonyms: 4-(3,4-dicarboxyphenoxy)benzene-1,2-dicarboxylic acid;1,2-benzenedicarboxylic acid, 4,4'-oxybis-;4,4'-oxydibenzene-1,2-dicarboxylic acid;4,4'-oxydiphthalic acid(ODTA);Bis(3,4-dicarboxyphenyl) ether;4,4'-Oxybisphthalic acid;3,3',4,4'-Tetracarboxydiphenyl oxide;4-(3,4-DICARBOXYPHENOXY)PHTHALIC ACID
• CAS NO: 7717-76-2
• Molecular Formula: C₁₆H₁₀O₉
• Molecular Weight: 346.25
• Product Categories: strong recommend
• Mol File: 7717-76-2.mol
• Article Data: 10

Chemical Properties

• Melting Point: 229-231.5 °C (decomp)
• Boiling Point: 645.2±55.0 °C(Predicted)
• Appearance: /
• Density: 1.647±0.06 g/cm3(Predicted)
• PKA: 2.71±0.10(Predicted)
• CAS DataBase Reference: 4-(3,4-dicarboxyphenoxy)benzene-1,2-dicarboxylic acid(CAS DataBase Reference)
• NIST Chemistry Reference: 4-(3,4-dicarboxyphenoxy)benzene-1,2-dicarboxylic acid(7717-76-2)
• EPA Substance Registry System: 4-(3,4-dicarboxyphenoxy)benzene-1,2-dicarboxylic acid(7717-76-2)

Safety Data

• Hazardous Substances Data: 7717-76-2(Hazardous Substances Data)

Usage

Description

4-(3,4-dicarboxyphenoxy)benzene-1,2-dicarboxylic acid, also known as Tetrachlorophthalic acid, is an aromatic dicarboxylic acid with a molecular formula C16H6Cl4O6. It belongs to the group of tetrachlorophthalic acids and is characterized by its heat resistance, electrical insulation properties, and use in the production of high-performance materials.

Uses

Used in Polymer Production:
4-(3,4-dicarboxyphenoxy)benzene-1,2-dicarboxylic acid is used as a monomer in the production of polymers, specifically for manufacturing high-performance resins and coatings. Its heat resistance and electrical insulation properties make it a valuable component in this application.
Used in Flame-Retardant Materials:
In the Flame-Retardant Industry, 4-(3,4-dicarboxyphenoxy)benzene-1,2-dicarboxylic acid is used as a key ingredient in the production of flame-retardant materials. Its chemical structure contributes to the fire-resistant properties of these materials, enhancing safety in various applications.
Used as a Corrosion Inhibitor in Metal Coatings:
In the Metal Coating Industry, 4-(3,4-dicarboxyphenoxy)benzene-1,2-dicarboxylic acid serves as a corrosion inhibitor. Its presence in metal coatings helps protect against corrosion, extending the lifespan and durability of metal surfaces.
Overall, 4-(3,4-dicarboxyphenoxy)benzene-1,2-dicarboxylic acid plays a crucial role in the development of advanced materials for multiple industries, including polymer production, flame-retardant materials, and metal coatings, due to its unique properties and applications.

Upstream product

• 610-27-5 4-nitrophthalic acid 
• 27507-54-6 oxo-bis-4,4'-(N-methylphthalimide) 
• 41663-84-7 4-nitro-N-methyl-phthalimide 
• 1823-59-2 4,4'-oxydiphthalic dianhydride 
• 118-45-6 4-chlorophthalic anhydride 

Downstream Products

• 33734-37-1 4,4'-oxybis(N-phenylphthalimide) 
• 1569320-81-5 C₁₆H₈O₉^(2-)*C₁₃H₁₄N₂*Zn⁽²⁺⁾ 

Relevant articles and documents

Preparation method of 4, 4'-diphenyl ether tetracarboxylic dianhydride

The invention provides a preparation method of 4, 4'-diphenyl ether tetracarboxylic dianhydride, which comprises the following steps: S1, dissolving 4-nitrophthalic acid in a solvent, and heating for dehydration; S2, adding a molybdenum salt catalyst, a halogen promoter and carbonate into the reaction liquid obtained in S1, and carrying out etherification coupling reaction to obtain a 4, 4'-diphenyl ether tetracarboxylic acid crude product; S3, refining and dehydrating the crude product obtained in S3 to obtain 4, 4'-diphenyl ether tetracarboxylic dianhydride; wherein the weight ratio of the 4-nitrophthalic acid to the solvent to the molybdenum salt to the halogen is 1: (2-3.5): (0.02-0.05): (0.1-0.3); and the molar ratio of the 4-nitrophthalic acid to the carbonate is 1: (0.55-0.75). The molybdenum powder serves as the catalyst, the halogen serves as the cocatalyst, the conversion rate of the 4-nitrophthalic acid is larger than 99%, the molar yield of the 4, 4'-diphenyl ether tetracarboxylic acid crude product is larger than 85%, the method is unique, the technological process is simple, operation is easy, the yield is high, the cost is low, and the production efficiency and economic benefits are high.

METHOD OF PURIFYING DIANHYDRIDES, THE DIANHYDRIDES FORMED THEREBY, AND POLYETHERIMIDES FORMED THEREFROM

A method for purifying an oxydiphthalic anhydride comprises diluting a first mixture comprising an oxydiphthalic anhydride, a solvent, a catalyst, and an inorganic salt with a solvent, to provide a second mixture having a solids content of 10 to 30 percent based on total weight of the second mixture; filtering and washing the solids of the second mixture at a temperature below the crystallization point temperature of the oxydiphthalic anhydride to provide a third mixture; hydrolyzing the third mixture by adding water and a water-soluble acid to form a fourth mixture; heating the fourth mixture; then cooling to provide a solid-liquid mixture, optionally decanting a portion of the liquid, re diluting the remaining solid-liquid mixture, then filtering to provide a solid component; washing the solid component with water to provide a fifth mixture of oxydiphthalic tetra acid and water; ring closing the oxydiphthalic tetra acid to provide oxydiphthalic anhydride, and filtering the oxydiphthalic anhydride.

Method of purifying dianhydrides

Disclosed herein is a method for purification of dianhydrides comprising a substantial amount (10000 ppm or more) of at least one metal salt. In one aspect the method is useful for the purification of dianhydrides prepared by the reaction of a halophthalic anhydride with a metal carbonate and may be optionally catalyzed by a phase transfer catalyst. The purification of the dianhydrides may be accomplished by hydrolyzing the dianhydride metal salt mixture directly to a tetraacid with an inorganic acid, followed by separating the impurities from an aqueous phase, and subsequently heating the tetraacid to effect ring closure to form a purified dianhydride having less than 50 parts per million metal halide and lower levels of other residual impurities. In one aspect the method is highly effective in removing phase transfer catalyst impurities such as hexalkylguanidinium halides initially present in the dianhydride undergoing purification.