17828-53-4

Basic information

• Product Name: HQDA
• Synonyms: HYDROQUINONE DIPHTHALIC ANHYDRIDE;HQDA;1,4-Bis(3,4-dicarboxyphenoxy)benzene dianhydride;1,4-Diphenoxybenzene-3',4',3'',4''-tetracarboxylic acid anhydride;4,4'-(4,1-Phenylenedioxy)bis[phthalic anhydride];4,4'-(p-Phenylenedioxy)bis[phthalic anhydride];1,4-Bis(3,4-dicarboxyphenoxy)benzene dianhydride(HQDPA);HQDPA
• CAS NO: 17828-53-4
• Molecular Formula: C₂₂H₁₀O₈
• Molecular Weight: 384.38
• Mol File: 17828-53-4.mol

Chemical Properties

• Melting Point: 251-252℃
• Boiling Point: 638.9±50.0 °C(Predicted)
• Appearance: /
• Density: 1.566
• Storage Temp.: 2-8°C Refrigerator
• CAS DataBase Reference: HQDA(CAS DataBase Reference)
• NIST Chemistry Reference: HQDA(17828-53-4)
• EPA Substance Registry System: HQDA(17828-53-4)

Safety Data

• Hazardous Substances Data: 17828-53-4(Hazardous Substances Data)

Usage

Chemical Properties

Shiny, peach colored crystal

Upstream product

• 41663-84-7 4-nitro-N-methyl-phthalimide 
• 18959-88-1 1,4-bis(4-oxy-1,2-benzenedicarboxylic acid)benzene 
• 123-31-9 hydroquinone 
• 89-20-3 4-chlorophthalic acid 

Relevant articles and documents

METHODS OF MANUFACTURE OF DIANHYDRIDES

A method of making dianhydride includes contacting a N-Substituted diimide with a carboxylic acid and substituted or unsubstituted dimethyl sulfoxide in an aqueous medium to provide a reaction mixture including tetra acid, triacid, imide diacid and diimide along with substituted or unsubstituted acetic acid, dimethyl sulfoxide and their derivatives. The method includes the isolation of tetra acid by precipitation in water followed by centrifuge or filtration. The tetra acid is converted into the corresponding dianhydride. The dianhydride prepared by the method are also described as precursor to make polyetherimide.

Preparation method of aromatic diether dianhydride

The invention discloses a preparation method of aromatic diether dianhydride, which comprises the following steps of: by using isobutene or tert-butyl alcohol as a protecting group of carboxyl of chlorinated or nitrophthalic acid, carrying out etherification reaction with disodium bisphenol salt to obtain an intermediate, removing the tert-butyl ester protecting group in the intermediate by usinga small amount of acid without strong alkali treatment to obtain diether tetracarboxylic acid, and finally, enabling the solid tetracarboxylic acid to directly form anhydride at a proper temperature,wherein acetic anhydride dehydration is not needed, and the reaction time of the whole process is only about 21 hours. The preparation method of the aromatic diether dianhydride is short in reaction period, simple and safe in process, high in production efficiency and low in production cost.

Silicone containing bis-thioether aromatic amines

A silicone containing bis-thioether aromatic amine has a chemical structure wherein an aromatic nucleus at each end of the chemical radical is chemically bonded to the remainder of the chemical radical by either sulfur, sulfoxide or sulfone.