15383-49-0

Usage

Chemical Properties

White crystal

InChI:InChI=1/C10H12O8/c11-7(12)3-1-4(8(13)14)6(10(17)18)2-5(3)9(15)16/h3-6H,1-2H2,(H,11,12)(H,13,14)(H,15,16)(H,17,18)

Upstream product

• 89-05-4 1,2,4,5-benzenetetracarboxylic acid 
• 89-32-7 Pyromellitic dianhydride 
• 6634-01-1 1,2,4,5-benzenetetracarboxylic acid ethyl ester 
• 94253-98-2 tetraethyl 1,2,4,5-cyclohexanetetracarboxylate 

Downstream Products

• 92298-55-0 cyclohexane-1,2,4,5-tetracarboxylic acid tetramethyl ester 
• 2754-41-8 1,2,4,5-cyclohexanetetracarboxylic acid-1,2:4,5-dianhydride 

Relevant academic research and scientific papers

METHOD FOR PRODUCING 1,2,4,5-CYCLOHEXANETETRACARBOXYLIC DIANHYDRIDE

An object of the present invention is to provide a method for producing 1,2,4,5-cyclohexanetetracarboxylic dianhydride, which is capable of stably achieving a high dehydration rate. The method for producing 1,2,4,5-cyclohexanetetracarboxylic dianhydride of the present invention is a method for producing 1,2,4,5-cyclohexanetetracarboxylic dianhydride by subjecting 1,2,4,5-cyclohexanetetracarboxylic acid to a dehydration reaction in a slurry state in the presence of a dehydrating agent, wherein an average particle size of the 1,2,4,5-cyclohexanetetracarboxylic acid is 20 μm or more.

Synthesis method for 1,2,4,5-cyclohexanetetracarboxylic dianhydride

The invention provides a preparation method for 1,2,4,5-cyclohexanetetracarboxylic dianhydride. The method comprises the following steps: preparing pyromellitic acid ester by reacting pyromellitic acid with an esterification reagent; synthesizing hydrogenated pyromellitic acid ester by adding the pyromellitic acid ester with hydrogen in a fixed bed reactor; obtaining the 1,2,4,5-cyclohexanetetracarboxylic dianhydride by synthesizing the hydrogenated pyromellitic acid ester in strong acids and organic solvents. Compared with a traditional production process, the esterification reaction of the invention has high efficiency, the service life of a catalyst is prolonged, continuous production of hydrogenation reaction is realized, and a process route is shortened. The method has the advantagesof simple operation, high production efficiency and low cost and the like. The content of metal ions (sodium, potassium, iron, calcium, aluminum, and zinc) of the obtained 1,2,4,5-cyclohexanetetracarboxylic dianhydride contains is equal to or less than 1 ppm, and meets requirements of electronic grade products.

POLYIMIDE AND POLYIMIDE FILM

PROBLEM TO BE SOLVED: To provide a polyimide that has excellent film-production process compatibility, and gives a heat-resistant film having excellent transparency, a high glass transition temperature, a relatively low linear thermal expansion coefficient, and sufficient film toughness at the same time. SOLUTION: A polyimide contains a repeating unit represented by the formula (II) (in formula (II), A is a bivalent group containing a cyclohexane ring, X is an amide group, R11-R18 independently represent a hydrogen atom, a C1-C6 alkyl group or a C1-C6 alkoxy group). SELECTED DRAWING: None COPYRIGHT: (C)2018,JPOandINPIT

Alicyclic carboxylic acid

PROBLEM TO BE SOLVED: To provide an unprecedentedly efficient method for manufacturing an alicyclic carboxylic acid by using a ruthenium-palladium co-supported catalyst as a catalyst for hydrogenating aromatic rings of aromatic carboxylic acids.SOLUTION:

Electronic grade hydrogenation of pyromellitic acid dianhydride preparation method (by machine translation)

The invention discloses a preparation method of electronic grade hydrogenated pyromellitic dianhydride. The method comprises the following steps: adding commercially available pyromellitic dianhydride with the purity greater than or equal to 98.0%, deionized water and a noble metal catalyst into an autoclave; feeding hydrogen into the autoclave and simultaneously carrying out a hydrolysis reaction and a catalytic hydrogenation reaction; carrying out aftertreatment after the reactions so as to obtain crude hydrogenated pyromellitic dianhydride; decoloring and refining crude hydrogenated pyromellitic dianhydride with deionized water and activated carbon so as to obtain hydrogenated pyromellitic dianhydride with the purity greater than or equal to 99.5%; finally, carrying out a dehydration reaction on hydrogenated pyromellitic dianhydride by using acetic anhydride so as to obtain electronic grade hydrogenated pyromellitic dianhydride with the purity greater than or equal to 99.85%. According to the method, the purity of prepared hydrogenated pyromellitic dianhydride can reach above 99.85%, and the content of single metal ions (such as sodium, potassium, calcium, iron, copper, aluminum and the like) in prepared hydrogenated pyromellitic dianhydride is respectively less than 1ppm. Thus, electronic grade hydrogenated pyromellitic dianhydride can be widely applied to the field of photoelectronics, micro-electronics and other high and new technologies.

PROCESS FOR PRODUCING HYDROGENATED AROMATIC POLYCARBOXYLIC ACID

A production method of a hydrogenated product of aromatic polycarboxylic acid by the hydrogenation of aromatic ring of the aromatic polycarboxylic acid in the presence of a catalyst composed of rhodium in combination with palladium and/or platinum support

Process for producing hydrogenated aromatic polycarboxylic acid and process for producing hydrogenated aromatic polycarboxylic anhydride

Disclosed are processes for industrially advantageously producing at a good yield respectively, a hydrogenated aromatic polycarboxylic acid and an acid anhydride thereof each having a high purity. The present invention provides processes for producing a hydrogenated aromatic polycarboxylic acid by (1) hydrogenating an aromatic polycarboxylic acid at a hydrogen partial pressure of 1 MPa or more by a batch system in the presence of a catalyst containing rhodium and palladium in a proportion of 0.5 to 10 parts by weight per 100 parts by weight of the aromatic polycarboxylic acid and by (2) feeding an aromatic polycarboxylic acid to a filling bed of a catalyst containing rhodium and palladium at a WHSV of 1 to 100 h?1 to hydrogenate it at a hydrogen partial pressure of 1 MPa or more by a continuous flow system, and a process for producing a hydrogenated aromatic polycarboxylic anhydride by subjecting the hydrogenated aromatic polycarboxylic acid obtained by the processes described above to dehydration reaction with acetic anhydride of 0.64 to 5.7 times mole based on a carboxyl group of the hydrogenated aromatic polycarboxylic acid.

Optically active phenoxypropionic esters

Optically active compounds of the formula I STR1 where R is C1 -C12 -alkyl or -perfluoroalkyl in which one or two non-adjacent CH2 or CF2 groups can also be replaced by --O-- and/or --CO-- and/or --CO--O-- and/or --CH=CH-- and/or --CH-halogen-- and/or --CHCN-- and/or --0--CO--CH-halogen-- and/or --O--CO--CHCN--, or is C1 -C12 -alkyl which can have a terminal chemically reactive group and in which a CH2 group can be replaced by --O--, A1 and A2 are each, independently of one another, 1,4-phenylene which is unsubstituted or substituted by one or two F and/or Cl and/or Br atoms and/or CH3 groups and/or CN groups and in which one or two CH groups can also be replaced by N, 1,4-cyclohexylene in which one or two non-adjacent CH2 groups can also be replaced by --O-- and/or --S--, 1,4-piperidinediyl, 1,4-bicyclo[2.2.2]octylene, 2,6-naphthalenediyl, decahydro-2,6-naphthalenediyl or 1,2,3,4-tetrahydro-2,6-naphthalenediyl, A3 is unsubstituted or substituted phenyl, Z is --CO--O--, --O--CO--, --CH2 CH2 --, --OCH2 --, --CH2 O--, --C C-- or a single bond and m is 0, 1, 2 or 3.

Dicylcohexyl-3,4,3'4'-tetra-carboxylic acid or dianhydride thereof and polyamide-acid and polymide obtained therefrom

A polyimide obtained from a polyamide-acid or polyamide-acid ester prepared by reacting dicyclohexyl--3,4,3?,4?-tetracarboxylic acid or dianhydride with a diamine is excellent in transparency, heat resistance and mechanical properties, said polyimide being able to be obtained at a lower temperature, and particularly suitable for an orientation film used in liquid crystal display device.