Method for fast producing caprolactam by means of strengthening and mixing
A caprolactam, jet mixer technology, applied in chemical recovery, organic chemistry and other directions, can solve problems such as affecting the mixing effect and affecting the quality of rearranged products, and achieve the effect of ensuring the mass transfer effect.
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Embodiment 1
[0067] Using oleum as an acid source, catalyzing the rearrangement of cyclohexanone oxime to produce caprolactam, the mass transfer and reaction are realized through a single jet mixer, and the reaction temperature is controlled by solvent vaporization and heat transfer. Cyclohexanone oxime is fully mixed with the flow rate of 12087.7kg / h and 68500.6kg / h of n-hexane to obtain a 15%wt cyclohexanone oxime-n-hexane solution with a concentration of cyclohexanone oxime, its mass flow rate and volume flow rate Respectively 80588.3kg / h and 120.55m 3 / h. The cyclohexanone oxime solution enters axially through the mixer, the inner diameter of the throat is 45mm, and the throat speed is about 21.0m / s.
[0068]A plurality of small holes are uniformly distributed on the circumference of the narrowest part of the throat of the mixer. Another raw material for the rearrangement reaction is SO 3 Fuming sulfuric acid with a content of 20.0% (mass fraction) enters the interior of the nozzle ...
Embodiment 2
[0071] Taking the nitrosation product of cyclohexyl formic acid as the acid source, its typical composition is: 23.1% (mass percentage, the same below) of cyclohexyl formic acid, 11.3% of sulfur trioxide, 28.2% of sulfuric acid, 18.3% of n-hexane, 16.0% of caprolactam, and the rest are by-product. Further catalyze the rearrangement of cyclohexanone oxime to produce caprolactam, so as to reduce the byproduct of ammonium sulfate per unit of caprolactam.
[0072] A double-jet mixer is adopted, and the axial feed is 15%wt cyclohexanone oxime solution, the mass flow rate is 80602kg / h, and the corresponding volume flow rate is 120.6m3 / h. The viscosity of the material fed into the throat is 0.873mPas, the temperature is 39.3°C, the inner diameter of the throat is 79mm, the diameter of the plug is 70mm, and the speed of the throat is about 16m / s.
[0073] There is an annular gap around the narrowest part of the throat of the mixer, and the nitrosation product of cyclohexyl formic aci...
Embodiment 3
[0076] With the nitrosation product of cyclohexyl formic acid as the acid source, the light phase n-hexane is first removed by centrifugation, and the heavy phase consists of: cyclohexyl formic acid 28.1% (mass percentage, the same below), sulfur trioxide 13.0%, sulfuric acid 34.6% , Caprolactam 19.8%, the rest is by-products. Further catalyze the rearrangement of cyclohexanone oxime to produce caprolactam, so as to reduce the byproduct of ammonium sulfate per unit of caprolactam.
[0077] Using a double-jet mixer, the axial feed of the nozzle is 12%wt cyclohexanone oxime solution, the mass flow rate is 100730kg / h, and the corresponding volume flow rate is 150.68m 3 / h. The inner diameter of the throat is 51mm, the diameter of the plug is 41mm, and the speed of the throat is about 29.0m / s.
[0078] The axial direction is a whole except for the plug, and 40 3 holes are opened in the radial direction at the narrowest part of the throat. Its mass flow rate is 46375kg / h, and th...
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