Sewage pretreatment process used during organic product preparation
A sewage pretreatment and preparation process technology, applied in the preparation of organic compounds, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of high cost, large processing capacity, environmental pollution, etc., and achieve The effect of reducing energy consumption, reducing COD, and reducing costs
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Embodiment 1
[0031] This embodiment is a sewage pretreatment process in the preparation process of diethyl phenylmalonate. Diethyl phenylmalonate uses toluene as a solvent, sodium ethylate as a catalyst, ethyl phenylacetate, diethyl carbonate Esters are used as the primary and secondary raw materials for the reaction, and the pretreatment process includes the following steps:
[0032] (a) adding toluene, ethyl phenylacetate, diethyl carbonate and sodium ethylate to react in the synthesis kettle;
[0033] (b) Add saturated sodium chloride solution in the washing neutralization kettle, cool, then add the reaction solution in the synthesis kettle into the washing neutralization kettle, and titrate to weak acidity with hydrochloric acid;
[0034] (c) washing the solution in the neutralization tank to stand still to obtain the lower layer solid-liquid mixture and the upper organic layer;
[0035] (d) Suction filtration of the solid-liquid mixture in the lower floor to obtain solid sodium chlor...
Embodiment 2
[0039] This embodiment is a sewage pretreatment process in the preparation process of diethyl phenylmalonate, diethyl phenylmalonate adopts toluene as solvent, sodium methoxide as catalyst and ethyl phenylacetate, diethyl carbonate As the main and auxiliary raw materials of the reaction, the pretreatment process includes the following steps:
[0040] (a) adding toluene, ethyl phenylacetate, diethyl carbonate and sodium methylate to react in the synthesis kettle;
[0041] (b) Add saturated sodium acetate solution in the water-washing neutralization kettle, cool, then add the reaction solution in the synthesis kettle to the water-washing neutralization kettle, and titrate to weak acidity with acetic acid;
[0042] (c) washing the solution in the neutralization tank to stand still to obtain the lower layer solid-liquid mixture and the upper organic layer;
[0043] (d) Suction filtration of the solid-liquid mixture in the lower floor to obtain solid sodium acetate and a mixed sol...
experiment example
[0054] Produce 1000kg diethyl phenylmalonate according to the method of embodiment 2 and comparative example 1 respectively; And each process parameter in embodiment 2 and comparative example 1 is exactly the same; The calculation results are shown in Table 1 and Table 2:
[0055] Each raw material and output that adopt in the embodiment 3 of table 1
[0056]
[0057] Each raw material and output that adopt in the comparative example 1 of table 2
[0058]
[0059] From Table 1 and Table 2, it can be seen that the sewage in the primary washing section of the present invention can be reduced by nearly 100%, and sodium acetate can be reclaimed and separated by nearly 100% by filtering. In addition, because the sodium acetate reclaimed contains molecular water and is sodium acetate trihydrate, Therefore, not only does the primary washing section not discharge waste water, but also needs to replenish part of the water to achieve system balance. At this time, part of the wate...
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