Process for preparing caprolactam
A technology for preparing caprolactam, which is applied in the field of preparing caprolactam, can solve the problems of complex process, large equipment investment, and long process flow, and achieve the effects of simplified process flow, shortened process flow, and strong extraction capacity
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Embodiment 1
[0042] Embodiment 1: as figure 1 As shown, 99.88% (wt) cyclohexanone from the cyclohexanone preparation process and 99.9% cyclohexane from the same process are formulated into 20-30% cyclohexanone at a volume ratio of 1:3-1:4 The cyclohexane solution, then enters the ammoximation reactor at a flow rate of 40.4-50.5t / h.
[0043] Add 2.0~2.2t / h of NH to the ammonia oximation reactor at the same time 3 , 15.1~15.7t / hH 2 o 2 , in the presence of a Ti / Si molecular sieve catalyst with a concentration of 2-4% (wt), at a temperature of 80-90 ° C and a pressure of 0.4 MPa, the ammoximation reaction is carried out under normal pressure conditions, and then filtered out by hydrocyclone separation The water phase containing the catalyst is controlled to pass through the coalescer to remove a small amount of brine under a flow rate of 42.5t / h to 52.5t / h to obtain a cyclohexane solution of cyclohexanone oxime.
[0044] The cyclohexane solution of cyclohexanone oxime enters the Beckmann ...
Embodiment 2
[0049] Embodiment 2: the difference between this embodiment and embodiment 1 is that the toluene extractant replaces the benzene extractant.
Embodiment 3
[0050] Embodiment 3: the difference between this embodiment and embodiment 1 is that the trichlorethylene extractant replaces the benzene extractant.
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