A method for preparing phthalic anhydride and its derivatives substituted by aromatic rings by oxidative cracking of aromatic ketones
A technology of phthalic anhydride and oxidative cracking, which is applied in organic chemistry and other fields, and can solve problems such as harsh reaction conditions and high energy consumption
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Embodiment 1
[0012] 0.01g MnO 2 Catalyst, 1mmol 1-indanone and 2g chlorobenzene were added to a stainless steel autoclave with a polytetrafluoroethylene lining inside. The temperature was raised to a reaction temperature of 100° C. using an automatic temperature controller, and 0.6 MPa oxygen was added to react for 4 hours. During the reaction, the pressure was kept constant. The reaction product was analyzed by GC-MS, and the yield of phthalic anhydride was 80%.
Embodiment 2-23
[0014] Except catalyst and consumption, pressure, reaction time are different, catalyst activity evaluation is identical with embodiment 1. The reaction conditions and catalytic reaction results are shown in Table 1. It can be seen from Table 1 that the catalyst and its dosage, oxygen pressure, reaction temperature and reaction time have an impact on the catalytic effect. With the increase of reaction temperature (Examples 2 and 3), catalyst consumption (Examples 2 and 5), oxygen pressure (Examples 3 and 5) and reaction time (Examples 5 and 6), the yield increased. The increase in the catalyst dosage increases the oxygen pressure, and the acid anhydride yield also increases. Transition metal V, Fe, Co, Mn, Cu, Cr, Mo, Ce, Nb, W oxides or metal salts all show good results.
[0015] Table 1 Preparation of phthalic anhydride by oxidative cracking of 1-indanone
[0016]
[0017]
Embodiment 24-36
[0019] The catalyst activity evaluation was the same as in Example 1 except that the substrate was different. The reaction conditions and catalytic reaction results are shown in Table 2. The 1-indanones substituted by different aromatic rings can be oxidatively cracked to generate the corresponding anhydride compounds.
[0020] Table 2 Oxidative cracking of different aromatic ketones
[0021]
[0022]
[0023]
[0024] The invention has high oxidation efficiency and high product yield; uses air or oxygen as the oxygen source, is economical, environmentally friendly and has good application prospects.
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