Study Of Tetrabromobisphenol A Polycarbonate Oligomer Preparation And Microemulsion Extraction Of Cobalt

First,the influence of the concentration of sodium oleate and pentanol on the water content of microemulsion was stuied.It is found that;the water concent of mircoemulsion increased as a straight line basically with the increase of the NaOL concentration.It first increased to a maximum and then decreased sharply,with a subsequent slow decrease to a flatform with the increase of the pentanol concentration. The microemulsions prepared were used for the extraction of cobalt.The effect of the concentraction of surfactant,pentanol,volume ratio of aqueous to microemulsion(R) and temperature on the extraction yield was investigated.The result shows that the extraction of cobalt is effective under well-defined conditions utilizing Winsorâ…¡microemulsioin systems.The extraction yield inceased with the increase of pentanol concentration first and then reduced,reduced with the increase of temperature.The extraction mechanism of cobalt by NaOL microemulsion system was discussed via the investigation on the nature of the load saturation organic phase.The FT-IR spectra, electric conductivity(σ)of the load saturation organic phase were investigated.The result showed that the extraction ofCo²⁺with NaOL microemulsion may be an ion-exchange reaction with Na⁺.The reaction product is a stable hydrophobic chelate complex of metal ions and OL^-.In addition,this chelate complex,with no surface activety to form a microemulsion,dissolves in the continuous organic phase.A thermodynamically stable microemulsion system was made with CTMAB, pentanol,water,heptane.Then this microemulsion system was used for the extrtaction of cobalt.The influence of the concentration of CTMAB and pentanol on the extraction yield was investigated.The mechanism of the cobalt extraction was discussed.It may be as follows; Co(SCN)₄^2-_aq+M⁺_aq+CTMAB⁺Br^-_o(?)NH₄⁺Co(SCN)₄^2-CTMAB⁺_o +Br^-_(aq)M⁺;Na⁺or NH₄⁺Tetrabromobisphenol-A polycarbonate(TBBPA-PC)was synthesized by inter facial polymerization with triphosgene(BTC)and tetrabromobisphenol A(TBBPA). The Reaction temperature and the molar ratios of BTC/TBBPA and catalyst/TBBPA were investigated to control molecular weights and increase production yields.Weight; 1500～5000,salt-point;180℃～220℃,density;2.2g/cm³,Br content;50-60%. Productivity;97.4%...