Rhodium acetic anhydride complex, and its preparing method and use
A technology of rhodium acetic anhydride and complexes, applied in the field of acetic anhydride rhodium complexes and its preparation, can solve problems such as poor catalyst stability, limited theoretical research, and no value for industrial development, and achieve excellent catalytic activity and selectivity The effect of improving the performance and catalytic activity
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Example Embodiment
[0017] Embodiment 1,
[0018] 0.6 moles of acetic anhydride was weighed and dissolved in 3.0 moles of methanol, and the mixture was fully stirred and divided into three portions. With stirring in an ice bath, 0.1, 0.2, and 0.3 moles of rhodium acetate were added, respectively. After continuing to stir for 20 minutes, excess ether was added for precipitation and filtration; the product was washed three times with ether, and the pressure was reduced to constant weight at room temperature to obtain a rhodium acetic anhydride complex.
[0019] The results of elemental analysis of this complex are as follows:
[0020] element
Example Embodiment
[0021] Embodiment 2,
[0022] Add 0.2 g of acetic anhydride rhodium complex, 2.48 moles of methanol, 0.65 moles of acetic acid, and 0.34 moles of methyl iodide to the reaction kettle. Time 30 minutes. After the reaction, the product composition was determined by gas chromatography: the methanol conversion rate was 100%, and the product composition was 0.82 moles of methyl acetate and 1.45 moles of acetic acid.
Example Embodiment
[0023] Embodiment 3,
[0024] 0.25 g of rhodium complex, 2.48 moles of methanol, 0.5 moles of acetic acid, 0.34 moles of methyl iodide and 0.08 moles of lithium iodide were added to the reaction kettle. After CO was introduced, the temperature was raised to 150° C., the pressure was maintained at 4.0 MPa, the stirring speed was 500 rpm, and the reaction time was 20 minutes. After the reaction, the product composition was determined by gas chromatography: the methanol conversion rate was 100%, and the product composition was 0.57 moles of methyl acetate and 1.80 moles of acetic acid.
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