Method for preparing acetic acid and acetic anhydride respectively or synchronously
A technology of acetic anhydride and acetic acid, which is applied in the direction of chemical instruments and methods, carbon monoxide reaction to prepare carboxylic acid, organic compound/hydride/coordination complex catalyst, etc., which can solve the problems of rising production cost, easy precipitation, poor product purity, etc. , to achieve the effects of improved stability, reduced corrosion, and reduced manufacturing costs
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Embodiment A
[0043] Add rhodium precursor rhodium iodide and iridium iodide in the reaction still prepared by catalyst, make the mass ratio of rhodium and iridium be (2~10):(5~20), add the N with iridium mole fraction 1:1 -Methylalanine and water; add methyl iodide and acetic acid as a solvent in accordance with the production process; then feed CO, and stir for 2 hours at a reaction temperature of 150° C. and a pressure of 3.0 MPa. After cooling, it is detected with an infrared spectrometer that rhodium in the catalyst solution is [Rh(CO) 2 I 2 ] - Exists in the form of iridium [Ir(CO) 2 I 2 ] - form exists.
Embodiment B
[0045] Add the rhodium precursor rhodium iodide into the reaction kettle prepared by the catalyst, then add the amount of methyl iodide in line with the production process, solvent acetic acid, and then pass in CO, react at a reaction temperature of 150 ° C and a pressure of 3.0 MPa for 2 hours, and prepare A coordination compound of rhodium, which is in the form of a solution.
[0046] This example is not an example of the invention because there is no amino acid or amino acid derivative stabilizer in the catalyst system.
Embodiment 1
[0048] in the process as attached figure 1 In the continuous device, the product prepared in Example A is added to the reactor together with methyl iodide, acetic acid, acetic anhydride, and lithium acetate. The addition of methyl iodide, acetic acid, and acetic anhydride depends on the needs of the reaction. Water added in preparation. The reaction temperature is 190°C, the pressure is 4.0MPa, the mass concentration of rhodium in the control reaction solution is 800ppm, the mass concentration of iridium is 1000ppm, the mass concentration of lithium is 250ppm, the molar ratio of N-methylalanine and iridium is 1.0, methyl iodide Consumption is 12% of the weight of the mixed reaction solution, methyl acetate is 15% of the weight of the mixed reaction solution, the reaction raw materials are 43% methanol and 57% methyl acetate by weight, the solvent is acetic acid, and the other raw material is carbon monoxide and hydrogen. Mixed gas, the amount of hydrogen used is 5% of the mol...
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