Vacuum cooling crystallization system for adipic acid production
A vacuum cooling and crystallization system technology, which is applied in crystallization separation, solution crystallization, separation/purification of carboxylic acid compounds, etc., can solve problems such as personnel health and environmental pollution, achieve strong equipment compatibility, and solve personnel health and environmental pollution Effect
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Embodiment １
[0029] A vacuum cooling crystallization system for adipic acid production, such as figure 1 As shown, the system includes a crystallization tank 1 , a vacuum pump 20 , a spray recovery device 3 and a pipeline connecting the crystallization tank 1 , the vacuum pump 20 and the spray recovery device 3 .
[0030] The upper part of the crystallization tank 1 is provided with a feed pipe 4, one end of the feed pipe 4 communicates with the crystallization tank 1, and the other end of the feed pipe 4 is connected with the adipic acid feed pump; the feed pipe 4 is provided with an electrical connection The feed regulating valve 6 and the feed flow meter 11 can feed back the opening and closing of the feed regulating valve 6 through the feed flow meter 11 . The bottom of the crystallization tank 1 is provided with a discharge pipe 5; one end of the discharge pipe 5 is connected with the crystallization tank 1, and the other end of the discharge pipe 5 is connected with the downstream ad...
Embodiment 2
[0044] A vacuum cooling crystallization system for the production of adipic acid. The difference from Example 1 is that the spray recovery device used in the system is composed of three-stage absorption towers connected in series, and the middle part of each absorption tower is provided with three sections of packing layers. The used The packing is Taylor packing;
[0045] Each absorption tower contains a set of independent spray and water pump circulation system, the spray liquid used is water; the nitrous gas sucked from the crystallization tank enters from the lower part of the absorption tower through the vacuum pump outlet pipe, and is absorbed by water spray. Finally, the gas containing nitrous gas that has not been completely absorbed is discharged from the exhaust port on the top of the tower and enters the bottom of the next absorption tower; the gas containing nitrous gas that finally enters from the first absorption tower, of which the nitrous gas After the gas is a...
Embodiment 1
[0046] The setting of the single-stage absorption tower in Example 1 is suitable for the case where the processing capacity is small, and the nitrous gas extracted by the vacuum pump can be neutralized and absorbed by the lye. When the production scale of adipic acid is large, the single-stage absorption tower is not enough to absorb all the nitrous gas pumped out by the vacuum pump, and more nitrous gas is generated during the cooling process, and the direct neutralization reaction will cause lye and nitrous gas Therefore, multi-stage absorption towers are set up in series, and water is used to absorb nitrous gas to obtain nitric acid again; at the same time, packing layers are set in sections in each absorption tower to improve the absorption rate of nitrous gas; According to the measurement of the analyzer, the content of nitrous gas at the end of the vacuum pump outlet pipe is 3000ppm. After being absorbed in series by three-stage absorption towers, the content of nitrous g...
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