Preparation Of 1,3-ureylene-bi(Dithioformate) And Its Performance Research

With the development of the industry, the increasing oil consumption has caused serious oil pollution, caused by the backward of technologies and managements. As a new high-performance de-oil flocculants, the dithiocarbamate, denoted as DTC, have arising the great interests of the worldwide research. However, DTC could not be widely applicated in china because its high cost. Accordingly, 1,3-ureylene-bi(dithioformate) was prepared by adopting the low cost material, i.e, urea to promot the application of dithiocarbamate in china. The preparation procedures and conditions were optimized to prepare the ideal de-oil flocculant. The optimum conditions included 50 ℃ of reaction temperature, 30.0 g of 50 % of NaOH aqueous solution, 2 h of reaction time and 1.6:1.0 of the molar ratio of CS2 and urea. And, under the above conditions, the performance of the obtained product was satisfactory. The product yeild could reach 92.1%. Research on the treatment of many oily wastewaters indicated that the UDF dosage, effluent temperature and pH, and the deposition time as well as Fe content showed great effect of oil-removed flocculation, the optimum dosage of UDF varied with the different of wastewater, the optimum effluent temperature range is from 20 ℃ to 30 ℃. And the optimum deposition time is 30 min, Moreover, UDF was proved to be applicated in the neutral and weakly acidic wastewater. And the content of Fe iron played an important part in the oily effluent treatment. Under above optimum conditions, the removal percentage of oil, chroma and CODCr and could reach 96.8 %, 93.8 % and 81.1 %. For the oily wastewater from food product factory, the remove percentages of oil, chroma and COD_cr could reach 92.6 %,90.0 %,72.4 %. For the dinning oily wastewater under the optium condition, the remove rates of oil, chroma and COD_cr could reach93.4 %,90.0 %,75.6 %. And the study on the inhibition and corrosion performances of UDF were also conducted, the results indicated that the scale inhibition percentages could reach 81.2 % and 73.8 % for the CaCO3 and Ca3(PO4)2 scale. Accordingly, the corrosion percentage could reach 68.1 %.