First, the process
The waste heat of the aldehyde gas is generated by the hydrolysis process of the furfural plant to evaporate the waste water, and the evaporated waste water is condensed, and the condensed water is returned to the boiler for further use or discharged after being treated; the concentrated liquid is decolorized and refined to obtain the finished melted snow CMA.
The boiling point of the wastewater under the crude distillation column is above 100 °C. When the sewage is treated by a simple evaporation method, since acetic acid and water have an azeotropic point, water cannot be separated from acetic acid. In order to achieve the purpose of separation of acetic acid and water, acetic acid must first be stabilized in the liquid phase, and then the water is evaporated, and finally calcium magnesium acetate is crystallized to obtain a calcium magnesium acetate product. The stabilizer may be sodium hydroxide, calcium oxyhydroxide, sodium carbonate, and other hydroxides.
In order to improve the evaporation efficiency, the scheme adopts a double effect evaporation method. The one-effect evaporator uses the aldehyde vapor generated in the production process to heat the wastewater, that is, the aldehyde gas is cooled according to the process. The heat source for heating is also solved. The two-effect evaporator heats the wastewater by using a gas distilled from a one-effect evaporator. In order to improve work efficiency, the two-effect evaporator is evaporated under reduced pressure. The boiling point of water is 100 ° C, and only organic matter below 100 ° C during evaporation can be evaporated to the vapor phase. Therefore, the composition of the material temperature in the vapor phase is between 99 and 100 oc, which is basically pure distilled water, which fully complies with the boiler water standard and can be returned to the boiler for use as boiler water. The concentrated liquid obtained after evaporation can be decolorized, purified and crystallized to obtain a finished snow melting agent CMA.
Second, the effect description
Furfural wastewater after 2 evaporations. The results show that the water CODQ is between 70 and 100 w/L. It is below 100 me/L. The experimental results show that the double-effect evaporation process can use the hot aldehyde gas to attract the double-effect evaporation system as a heat source, saving investment. The operating cost is low, and the treated effluent can be directly reused as boiler supplementary water after softening. Thereby achieving low cost and effective treatment of furfural wastewater.
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Label: Study on double-effect evaporation treatment process for furfural wastewater treatment
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