What is the next step of the Water Ballast Process that includes vaporization of methanol?
The next step in the process is the respective vaporization of the methanol, which occurs in the heat exchanger at the next junction of the process. The respective procured methanol is then pushed further at the temperature of about 150C and a pressure of about 29 psia. The conjoining stream input also contains fresh air at normal room temperatures (app 25C) and at pressures of about 14.7 psia. For the optimum processing, the respective pressure in this stream is raised to 35 psia by an integrated compressor. Further heating is maintained in this stream through the steam of medium pressure. The stream temperature is correspondingly raised to 150C in the next stream, which is conjoined by a combining stream at pressures of about 29 psia. The combination of the two streams maintains a temperature of about 149.6C and a pressure of about 28 psia.
Almost 87.4% of the methanol is converted in the reactor. The temperature of the exit reactor is maintained at 343C. furthermore, the high-pressure steam being generated by the boiler feed water aids in the respective removal of heat. The respective temperature and pressure of the outlet stream are maintained at 343 and 25 psia. Moreover, a drop in about 5 psia is maintained through a valve before entry into the absorber, which is flushed with fresh water at the pressure of 20 psia at 30C. almost 99% of the formaldehyde entering the absorber is effectively absorbed. This is then pushed into the stream for entering the formalin distillation column, being heated formerly to 102C before entry.
The formaldehyde in water recovered in the absorber conforms to a 37 wt% solution. The distillate tends to absorb the majority of the methanol. This respective distillate is utilized through recycling in the inlet of fresh methanol at 68.3°C and 16 psia. The bottom streams are pumped for storage at the pressure gradient of about 38.5 psia. 37 wt% solution of formaldehyde in water is achieved in the corresponding stream by adding deionized water maintained at temperatures of about 30C. This is maintained due to the respective challenge for the storage of formalin. Although formic acid formation is favored at high temperatures, the undesirable polymerization of formaldehyde is inhibited. Moreover, the acid formation is inhibited at lower temperatures, whereas acid formation is considerably favored. The storage tank contents must be maintained between 35°C and 45°C with ≤ 2 wt% methanol.