Removal Of Sodium Ion In Organic Solutions By Using PPS Fibre

As sodium sulfate produced during the production of phenol and acetone would go through the subsequent processes and may cause the deposition in the purification equipment, resulting in serious problems, so that it is necessary to remove the sodium ions in the solution.The object of this work is to use polyphenylene sulfide (PPS) fibre to remove the sodium ions in the emulsion. To finish this work, an appropriate method to determine sodium ions is needed. The ionization of sodium ions at high temperature makes it difficult to be determined. In this work, we first come up with an effective method to determine sodium ions.The components in the emulsion include phenol, acetone, cymene and a little proportion of sodium ion solution. Two types of emulsions were used in this work, which include: the simulated solution prepared in the lab and the emulsion from the factory. By changing conditions such as the mass of the PPS fibre and the flow rate in the range of 0.2～0.5ml/min, we find that, at lower flow rates, the removal efficiency increases as the mass of PPS and flow rate increase. However, the removal efficiency would not increase when the mass of PPS exceeds a certain value, according to the experiments. For certain amount of PPS, there is an optimum flow rate as the flow rate increases further. More than 78% of the sodium ions were removed when the ratio of the mass of fibre and flow rate is lg:lml/min. By using the coalescence theory, it is found that the interception mechanism contributes most part of the total efficiency. Other mechanism could be neglected compared with the interception effect. To predict the removal efficiency under different conditions, an equation is correlated according to the data, which can be used to guide the industrial production in the range of flow rate.Besides we use other methods such as ion exchange resin and electrical field to remove sodium ions. It is found that most of the sodium ions can be removed using ion exchange resin and more than 87% sodium ion can be removed when the voltage reaches 1100V.