cis-1,4-Cyclohexanedicarboxylic acid
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cis-1,4-Cyclohexanedicarboxylic acid
structure -
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CAS No:
619-81-8
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Formula:
C8H12O4
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Chemical Name:
cis-1,4-Cyclohexanedicarboxylic acid
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Synonyms:
1,4-Cyclohexanedicarboxylic acid,cis-;cis-1,4-Cyclohexanedicarboxylic acid;cis-Hexahydroterephthalic acid;1,4-cis-Cyclohexanedicarboxylic acid
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CAS No:
Safety Information
P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501
H315
cis-1,4-Cyclohexanedicarboxylic acid Use and Manufacturing
200g of terephthalic acid added to the autoclave were added 15g of obtained in Example 1~14 Pd-Pt / C catalyst, was added 1000g of water, stirring turn, leads to the first three times purged with nitrogen, the hydrogen gas was replaced with three times, then purged with hydrogen to a pressure of 4MPa and remain stable at the reaction temperature of 200 ° C, and hydrogen gas continuously fed 3h.After completion of the reaction, the catalyst was filtered while hot and the filtrate was cooled and filtered to give cake, the cake was dried to obtain a solid product was 120 ° C. The solid product was analyzed by liquid chromatography to obtain a solid product of 1, 4-cyclohexane dicarboxylic acid and trans-1, 4-cyclohexanedicarboxylic acid content, which can be calculated as 1, 4-cyclohexane yield and selectivity of trans-1, 4-cyclohexane dicarboxylic acid of the dicarboxylic acid, which results are shown in table 2 below.1, 4-dimethyl cyclohexane dicarboxylate 100g, concentrated sulfuric acid 40g, water 50g, mixed and heated to 100°C , the reaction is separated during distillation, after 3h the reaction ends, the reaction solution was cooled to room temperature, a large number of crystal precipitation, filtration, the filtrate cake was 80 after drying, a white powder product 82.6g, 96.0percent of its yield, purity of 99.5percent.In a 2 L four-necked round bottom flask, add 400 g of DMCD and 1200 g of water, add 7.8 g (0.2 Eq) of H2SO4 or 15.22 g (0.2 Eq) of p-TsOH.H2O and reflux for 24 to 30 hours with stirring.250 g of the mixture of methanol and water produced in the course of the reaction was slowly removed and heated for 18 to 24 hours. The resulting solid was filtered, washed with 400 g of cold water, and then the obtained solid was dissolved in a mixed solution of t-butanol and toluene Lt; / RTI & gt; The recrystallized solid was dried at 80 under vacuum to obtain 258 g (yield 75percent) of CHDA.
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cis-1,4-Cyclohexanedicarboxylic acid
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