PROCESS FOR PREPARING CAPROLACTAM BY ADMIXTURE OF CYCLOHEXANONE OXIME TO A REACTION MIXTURE

THE INVENTION RELATES TO A PROCESS FOR PREPARING CAPROLACTAM BY ADMIXTURE OF CYCLOHEXANONE OXIME TO A REACTION MIXTURE COMPRISING CAPROLACTAM AND SULFURIC ACID USING A MIXING DEVICE, SAID MIXING DEVICE COMPRISING (i) A TUBE THROUGH WHICH THE REACTION MIXTURE CAN FLOW, AND (ii) CHANNELS DISPOSED AROUND THE TUBE, SAID CHANNELS OPENING INTO THE TUBE, SAID PROCESS COMPRISING: PASSING THE REACTION MIXTURE THROUGH THE TUBE, AND FEEDING THE CYCLOHEXANONE OXIME INTO THE REACTION MIXTURE THROUGH ONE OR MORE OF SAID CHANNELS, WHEREIN Re>5000, Re BEING THE REYNOLDS NUMBER AS DEFINED BY p.V.D/ ?, WHEREIN p = DENSITY (IN KG/M³) OF THE REACTION MIXTURE THAT IS FED TO THE TUBE V = VELOCITY OF THE REACTION MIXTURE, V BEING DEFINED AS W/A, WHEREIN W IS THE FLOW RATE (IN M³/S) OF THE REACTION MIXTURE THAT IS FED INTO THE TUBE AND A IS THE CROSS SECTION AREA OF THE TUBE (IN M²) AT THE LEVEL WHERE SAID CHANNELS OPEN INTO THE TUBE. D = DIAMETER OF THE TUBE AT THE LEVEL WHERE SAID CHANNELS OPEN INTO THE TUBE (IN M). n = VISCOSITY OF THE REACTION MIXTURE THAT IS FED INTO THE TUBE (IN Pa.s).