94253-98-2Relevant academic research and scientific papers
Synthesis method of tetraethyl 1,2,4,5-cyclohexane tetracarboxylate
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Paragraph 0020; 0023-0025; 0028-0030; 0033-0041; 0044-0049, (2019/07/04)
The invention discloses a synthesis method of tetraethyl 1,2,4,5-cyclohexane tetracarboxylate. The synthesis method comprises the steps of synthesizing tetraethyl pyromellitate from pyromellitic acidand an esterification reagent, and further synthesizing
Synthesis method for 1,2,4,5-cyclohexanetetracarboxylic dianhydride
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, (2018/06/04)
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.
