Recovery method of tail gas light component in carbonylation production of acetic acid lanhydride
A recovery method and carbonylation technology are applied in the field of tail gas recovery in acetic acid production to achieve the effect of reducing consumption
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[0029] Examples 1, 2, 3, 4, 5, 6, 7, 8, 9:
[0030] Acetic acid is used as the first-stage absorption solution, and the first-stage absorption is performed, and the second-stage absorption test is not performed. Use a certain amount of N 2 Through methyl iodide and methyl acetate generators, the N gas containing methyl iodide and methyl acetate saturated gas 2 The gas passes through the first-stage low-pressure absorption tower and is absorbed with acetic acid. The test was carried out at different temperatures of methyl iodide and methyl acetate generators and at different absorption temperatures of acetic acid. The data are shown in Table 1.
[0031] Acetic acid freezes at 16.7°C, so the temperature cannot be lower.
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[0032] Examples 10-24:
[0033] Examples 10-24 are examples of absorption with methanol in the first stage and acetic acid in the second stage. 10~24 are data based on the temperature of methyl iodide, methyl acetate generator and absorbent. See Table 2.
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[0034] Examples 25-28:
[0035] Examples 25-28 are examples in which methyl acetate is used as the absorption solution for the first-stage absorption and acetic acid is used for the second-stage absorption.
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