Preparation process of cyclohexanone-oxime
A technology for the preparation of cyclohexanone oxime, which is applied in oxime preparation, chemical recovery, organic chemistry, etc., can solve the problems of increased energy consumption, and achieve the effects of reduced consumption, high quality, and low energy consumption
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[0023] Example 1: Such as figure 1 As shown, the process of the present invention includes the following steps:
[0024] a. 10920kg / h cyclohexanone and 2012kg / h ammonia, 15127kg / h 27.5% hydrogen peroxide enter the ammoximation reactor at the same time, in the presence of molecular sieve catalyst TS-1 and solvent tert-butanol (TBA) and 80~90℃ , Under the condition of 0.4~0.6Mpa, ammoximation reaction occurs;
[0025] b. When the conversion of cyclohexanone in the above reaction is 99.5%, it is filtered and separated. The catalyst separated by filtration is returned to the ammoximation reactor to continue to be used as a catalyst. The filtrate separated by filtration goes to the tert-butanol distillation column for distillation and distillation The solvent tert-butanol is returned to the ammoximation reactor and continues to be recycled as the reaction solvent;
[0026] c. Enter the cyclohexanone / cyclohexanone oxime / water mixed solution from the bottom of the tertiary butanol distill...
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[0030] Example 2: The difference between this example and Example 1 is that the n-hexane extractant replaces the cyclohexane extractant.
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[0031] Example 3: The difference between this example and Example 1 is that in the second step of oximation, 457kg / h of 13.8% of hydroxylamine phosphate was used to replace 457kg / h of 19.7% of hydroxylamine sulfate, which was obtained after ammonia neutralization and separation. The salt-containing heavy phase is sent to hydroxylamine to prepare and recover phosphate.
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