Isomerization method of cyclohexanedicarboxylic acid
A cyclohexanedicarboxylic acid, isomerization technology, applied in the field of isomerization of cyclohexanedicarboxylic acid, can solve the unproven reaction efficiency, yield and processing performance, t-CHDA is hard, difficult to handle and other problems
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Problems solved by technology
 For the isomerization of CHDA, a batch reactor capable of withstanding 300°C and 150 bar was selected as the reactor. 4.05 g of CHDA containing the cis isomer, 1.125 g of zirconia (monoclinic) from Saint-Gobain and 250 g of distilled water as solvent were placed in the prepared batch reactor and stirred at 50 rpm At the same time, the temperature of the mixed solution was raised to 250° C. (CHDA concentration in the solution: 1.6 wt %, zirconia / CHDA weight ratio=0.28). When the temperature of the mixed solution reached 250°C, the stirring speed was increased to 1000 rpm, and the reaction was performed for 5 hours while stirring.
 The BET specific surface area, pore volume and average pore diameter of the zirconia (monoclinic) used here are shown in Table 1 below, and the acid properties are shown in Table 2 below.
 The procedure was carried out in the same manner as in Example 1, except that zirconia (monoclinic) from Johnson Matthey was used instead of zirconia (monoclinic) from Saint-Gobain used in Example 1.
 Except for using zirconia (monoclinic)-titanium dioxide (anatase) from Saint-Gobain (where the content of titanium dioxide (anatase) in the total mixture (100% by weight) was 41% by weight) instead of the one used in Example 1 The procedure was carried out in the same manner as in Example 1 except for zirconia (monoclinic) from Saint-Gobain.
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