The main production process are as follows:

Concentration unit Spray granulation unit Fluidized drying unit

Washing and exhaust gas processing unit.

1.Concentration units, through the two stages concentration: the fresh formaldehyde solution 40% (mass percentage) form the formaldehyde production plant comes into falling film evaporator (one stage concentration unit ) by the feed pump,which with separation of lack of tanks and condensate tanks, at thia level, the formaldehyde concentration was raised to 69% ; formaldehyde content of cut fraction is 15% (to be confirmed when debugging ). Use the pump through the jet tenk, as the other usage; separationtank design has the benefit which can get the shortest stay time.

Concentrated liquid of the tank into thin-film evaporator through the pump, during this process, the formaldehde solution will be enriched to 85%; at this time the formaldehyde content in the steam distillation tank is about 30%(to be confirmed when debugging ), distillation formaldehyde after pump has been used for other purposes; a high concentration of 85% formaldehyde solution in the middle of the tenk through screw pump liquid adjustment valve to hit to the outside of battery limit. Fluidized drying unit: a high concentration of formaldehyde solution (85%) into spray granulation tower through the pump, to have granulation in the condensing chamber, then into the granulation tower and the fluidized bed , in finally , to package the para-formaldehyde in the export of a fluidized bed by rotating the valve.

3.Washing and tail gas treatment: In the granulation process , the dry gas took away atom poly-and C through the cyclone separatrion from the fluidized bed and granulation tower, tThe products separated can be separately collected, but also can be delivered to the fluidized bed export to have a mix packaging; the cycle of gas which from the splitter, will through the scrubber into the fan, agter washing, the washing liquid will into the tenk of formakdehyde material to have recycle; it will be the cycle of nitrogen carrier gas, when the oxygen content within the system reachs a certain value, waste gas in V and washed into the exhaust venting emissions through the control valve are didcharged into the bag filter.