Combined method for preparing maleic anhydride by oxidation and co-producing butanedioic anhydride
A technology of succinic anhydride and a combined method, which is applied in the combined field of oxidatively producing maleic anhydride and co-producing succinic anhydride, can solve the problems of single processing scheme, large equipment investment, large material loss and the like, and achieves simple method, low energy consumption, The effect of saving packaging
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Embodiment 1
[0029] Example 1, the reaction gas produced by the oxidation reactor in the maleic anhydride production section by benzene oxidation, after passing through the partial condenser, the temperature drops below 217°C, and the gas-liquid separation is carried out, and the separated liquid enters the crude maleic anhydride tank. The original process refines and purifies these crude maleic anhydrides. Because its various indicators meet the technical requirements of raw materials determined by itself (see Table 1), the temperature is now adjusted to 160 ° C ~ 200 ° C through heat exchange, and it is used as the feed material for the production section of succinic anhydride by catalytic hydrogenation, and the reaction is added by metering Under the conditions of 160°C~200°C and hydrogen partial pressure of 1.5MPa~2.0MPa, the reaction time is 40min~90min, the conversion rate of maleic anhydride is greater than 99.6%, and succinic anhydride with a purity of 97.3% is produced. Combinatio...
Embodiment 2
[0030] Example 2, the mixed solution in the crude maleic anhydride tank in the maleic anhydride production section by benzene oxidation, which was refined and purified by the original process. Because its various indicators meet the technical requirements of raw materials determined by itself (see Table 1), its temperature is adjusted to 55°C~100°C through heat exchange, and it is used as the feed material for the production section of succinic anhydride by catalytic hydrogenation, and added to the dissolution and mixing facility , dissolved by the solvent acetic anhydride to make a 10%~30% maleic anhydride solution, catalytic hydrogenation at 55°C~100°C, hydrogen partial pressure 1.0MPa~1.6MPa, reaction time 60min~90min, maleic anhydride conversion The rate is greater than 99.6%, and succinic anhydride with a purity of 98.0% is generated. Combination of benzene oxidation to maleic anhydride co-production of succinic anhydride process.
Embodiment 3
[0031] Example 3, during the refining and purification process of the benzene oxidation to maleic anhydride section, the cooler cools the maleic anhydride product to 60°C~70°C. The original process sent these maleic anhydride products to the condensation forming packaging process or liquid external supply. Because its various indicators meet the technical requirements of the national standard GB / T 3676-2020, its temperature is now adjusted to 55°C~100°C through heat exchange, and it is used as the feed material for the production section of succinic anhydride by catalytic hydrogenation, and added to the dissolution and mixing facility. The solvent acetic anhydride is dissolved to make a maleic anhydride solution with a concentration of 10~30%, catalytic hydrogenation at 55°C~100°C, hydrogen partial pressure 1.2MPa~1.6MPa, the reaction time is 60min~90min, and the conversion rate of maleic anhydride is greater than 99.8 %, generating succinic anhydride with a purity of 98.1%. ...
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