Quick cooling method for allyl nitrile
An alkene nitrile and quenching technology is applied in the purification/separation of carboxylic acid nitrile, the preparation of hydrocarbon ammoxidation, etc. It can solve the problems of uneven spraying and low recovery rate of acrylonitrile, avoid deep burial treatment, improve recovery rate, The effect of improving the recovery rate
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Embodiment 1
[0025] The reaction gas entering the quenching tower contains 42 grams of acrylonitrile per hour, the temperature is 210°C, the upper section is 5 theoretical plates, and the lower section is an empty tower. , the spray volume of the lower section is 31.9 ml / min, and the sewage discharge is 0.4 ml / min. The circulating spray volume of the upper stage is 123.6 ml / min, sulfuric acid is directly added to the liquid collecting tray, the pH value of the circulating liquid is controlled to be 3.5, the gas at the top outlet contains 39.4 g / h of acrylonitrile, and the recovery rate of acrylonitrile in the quenching tower is 93.8 %.
Embodiment 2
[0027]The reaction gas entering the quench tower contains 42 grams of acrylonitrile per hour, the temperature is 210°C, the upper section is 5 theoretical trays, and the lower section is 2 theoretical trays. The top operating pressure of the quench tower is 0.036Mpa, and the top temperature is 82°C. The temperature is 82°C, the spray volume of the lower stage circulation is 31.9 ml / min, and the sewage discharge rate is 0.4 ml / min. The circulating spray volume of the upper section is 123.6 ml / min, sulfuric acid is added to the replenishing water of the upper section, and then added to the liquid collection tray, the pH value of the circulating liquid is controlled to be 3.0, and the gas at the outlet of the tower top contains 39.5 g / h of acrylonitrile. The recovery rate of acrylonitrile was 94.0%.
Embodiment 3
[0029] The reaction gas entering the quenching tower contains 42 grams of acrylonitrile per hour, the temperature is 210°C, the upper section is 5 theoretical plates, and the lower section is an empty tower. , the lower circulating spray volume is 31.9 ml / min, and the sewage discharge rate is 0.4 ml / min. The amount of spray liquid in the upper stage circulation is 123.6 milliliters per minute, and a stream of 12.7 milliliters per minute is extracted from the circulating liquid in the upper stage. The pH value of the circulating liquid was controlled to be 3.5, the gas at the top outlet contained 39.4 g / h of acrylonitrile, and the recovery rate of acrylonitrile in the quenching tower was 93.8%.
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