METHOD OF CONTROLLING WATER EVAPORATION FROM CAPROLACTAM Russian patent published in 2013 - IPC C07D201/16 C07D223/02 B01D1/26 

FIELD: process engineering.

SUBSTANCE: proposed method additionally exploits caprolactam water solution feed pump with heat exchanger communicated via pipeline with steam expander, caprolactam flow rate transducer and valve, heater communicated via pipeline with first stage heating chamber first inlet with temperature, pressure and steam flow rate gages with valve. Its outlet is connected with first stage separator with pressure gage with its first outlet connected with second stage heating chamber first inlet connected with heater. Its second outlet is connected via pipelines with first and second stage heating chamber second inlet and second stage separator with vacuum pickup connected via pipeline with condensers with condensate collector and first steam ejection plant with flow rate gage and valve to inlet of which steam is fed. Note here that second stage separator is connected via pipeline with barometric collector with flow rate and valve, pump to feed caprolactam water solution to third stage heater. Second outlet of the latter is connected via pipeline with first and second steam ejection plant wit steam flow rate gage and valve. Third stage heater outlet is connected via pipeline with third stage heating chamber with temperature gage and flow rate gage with valve. First outlet of the latter is communicated third stage separator communicated with condensers of second steam ejection plant. Note here that first inlet is connected via pipeline with third stage heating chamber and its second outlet is connected with caprolactam evaporates solution. Note also that preset are flow rate of caprolactam solution, steam to heater, first stage heating chamber, barometric collector level, steam for steam ejection plant and third stage heating chamber to act on appropriate valves.

EFFECT: higher efficiency and quality, simplified process.

1 cl, 2 dwg