Method for preparing oxalate tail gas by purified CO coupling
A coupling technology for producing oxalate and tail gas, which is applied to chemical instruments and methods, separation methods, and separation of dispersed particles. Eliminate the difficult control of the removal process and achieve the effects of light weight, increased effective specific surface area, and small volume
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Embodiment 1
[0014] The tail gas stream with a nitrogen oxide content of 1% and oxygen are respectively fed from the bottom of the methanol absorption tower, and methanol is fed from the top of the methanol absorption tower. At a temperature of 5°C and a pressure of 0.6MPa, methanol and nitrogen are oxidized The reaction is carried out at a molar ratio of 30:1 and a molar ratio of nitrogen oxides to oxygen of 4:1. The obtained liquid stream is recycled, and the obtained gas stream and acidic urea solution are respectively sent to the supergravity rotating packing In the bed, the acidic urea aqueous solution is a uniform mixed solution of urea, water and nitric acid. The urea concentration is 30%, the pH is 3, the temperature is 35℃, the pressure is 0.1MPa, and the liquid-to-air ratio is 20L / m 3 , The absorption reaction is carried out under the condition of the rotor speed of 3000 rpm, and the emission content of nitrogen oxides in the exhaust gas after absorption is 80 ppm.
[0015]
Embodiment 2
[0017] The raw material composition of the tail gas stream, the operating conditions of the methanol absorption tower and the supergravity rotating packed bed are all the same as in [Example 1], except that the type of acid is changed. The specific results are shown in the following table:
[0018] Type of acid sulfuric acid hydrochloric acid acetic acid Emission content of nitrogen oxides in exhaust gas after absorption, ppm 120138175
Embodiment 3
[0020] The raw material composition of the tail gas stream and the operating conditions of the methanol absorption tower are the same as in [Example 1]. The super-gravity rotating packed bed is replaced with an absorption tower. The operating conditions of the absorption tower are that the acidic urea aqueous solution is composed of urea, water and nitric acid. Uniformly mixed solution, with a urea concentration of 25%, a pH of 3, a temperature of 65°C, a pressure of 0.2MPa, and a liquid-gas ratio of 80L / m 3 The absorption reaction is carried out under the conditions of, and the emission content of nitrogen oxides in the exhaust gas after absorption is 120 ppm.
[0021]
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