Process for refining dicyclohexylamine by using partition plate tower
A technology of dicyclohexylamine and baffle column, which is used in the purification/separation of amino compounds, organic chemistry, etc., can solve the problems of high cost, high energy consumption, and few application cases of baffle column, and achieves the improvement of purity and energy consumption. The effect of reduction and cost reduction
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Embodiment 1
[0040] Dicyclohexylamine clapboard column refining process, dicyclohexylamine is refined by vacuum distillation in the clapboard column, the steps are as follows:
[0041] 1) The crude dicyclohexylamine liquid is preheated by the preheater and enters the feed section of the partition tower for pre-fractionation. The feed temperature and flow rate are shown in Table 1. The light components and dicyclohexylamine enter the upper common In the rectifying section, heavy components and dicyclohexylamine enter the lower common stripping section.
[0042] 2) During the public rectification process, the temperature at the top of the tower is about 130°C, and the pressure at the top of the tower is about -90kPa. After the public rectification section is separated, the light components are discharged, and the condensate in the reflux tank is refluxed. The reflux ratio is 60. After public rectification After the stage, it is distributed into the feed section on both sides of the partition...
Embodiment 2
[0048] The steps required for the cladding column refining process of dicyclohexylamine are consistent with embodiment 1, and the difference is:
[0049] In the crude product liquid, the concentration of dicyclohexylamine is 97%, the temperature at the top of the tower is about 140°C, the pressure at the top of the tower is about -95kPa, the reflux ratio is 80, the distribution ratio is 1.5, and the concentration of dicyclohexylamine produced is 99.84%. Others are shown in Table 2.
[0050] Table 2
[0051] describe Feed light component heavy component Dicyclohexylamine Mass fraction wt% wt% wt% wt% Hexane 0.03％ 2.17％ 0.00％ 0.00％ Cyclohexylamine 0.75％ 55.76％ 0.00％ 0.00％ Hexanol 0.01％ 0.81％ 0.00％ 0.00％ Dicyclohexylamine 97.00％ 41.08％ 63.34％ 99.84％ high boiler 1.75％ 0.04％ 34.25％ 0.00％ low boiler 0.30％ 0.08％ 0.41％ 0.15％ Diimine 0.01％ 0.00％ 0.04％ 0.01％ Cyclohexylaniline 0.01％ 0.00％...
Embodiment 3
[0053] The steps required for the cladding column refining process of dicyclohexylamine are consistent with embodiment 1, and the difference is:
[0054] In the crude product liquid, the concentration of dicyclohexylamine is 96%, the temperature at the top of the tower is about 150°C, the pressure at the top of the tower is about -100kPa, the reflux ratio is 100, the distribution ratio is 2, and the concentration of dicyclohexylamine produced is 99.79%. Others are shown in Table 3.
[0055] table 3
[0056] describe Feed light component Distillation column bottom liquid Dicyclohexylamine Mass fraction wt% wt% wt% wt% Hexane 0.03％ 2.17％ 0.00％ 0.00％ Cyclohexylamine 0.75％ 55.76％ 0.00％ 0.00％ Hexanol 0.01％ 0.81％ 0.00％ 0.00％ Dicyclohexylamine 96.00％ 41.08％ 63.34％ 99.79％ high boiler 2.75％ 0.04％ 34.25％ 0.00％ low boiler 0.30％ 0.08％ 0.41％ 0.20％ Diimine 0.01％ 0.00％ 0.04％ 0.01％ Cyclohexylani...
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