Method and device for producing pta by deep oxidation using oxygen-poor gas
A technology of deep oxidation, oxygen-depleted gas, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry and other directions, can solve the problems of solvent acetic acid oxidation and combustion loss, high investment, large energy consumption, etc., to avoid acetic acid oxidation The effect of combustion, investment reduction and energy saving
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[0021] The invention provides a method for producing PTA by deep oxidation using oxygen-poor gas. The method includes two steps: step (1) is the oxidation stage, adding p-xylene (PX), acetic acid solvent and catalyst to the oxidation reaction device Usually, the oxidation gas introduced in step (1) is fresh air, which oxidizes p-xylene (PX) to terephthalic acid (TA), and at the same time generates an intermediate product: p-toluic acid (PT acid), p-carboxy basic formaldehyde (4-CBA), p-tolualdehyde (TALD), the oxidation tail gas is waiting for subsequent treatment; step (2) is the deep oxidation stage, and the mixture produced by the oxidation stage enters the deep oxidation reaction device, using Oxygen-depleted gas deeply oxidizes the mixture. The oxygen-depleted gas can be a mixture of purified exhaust gas and fresh air produced in step (1). The ratio of the two gases is about 4:1-10:1, such as 4:1 , 6:1, 8:1 or 10:1. The oxygen content in the mixed gas is preferably 4-10%...
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