| Ethylene glycol is a common dehydrating agent during dehydration process in gathering and transportation of natural gas production. As chlorination salts cumulated by recycling use of ethylene glycol solution, there have great harm to the whole craft and equipments in the meantime. Chlorine corrosion is the main factor of equipments erosion. It has great significance of running equipments as usual after controlling of chlorine corrosion by dechlorinating of solution and reusing of ethylene glycol .This research has signifant practical value. As a mature and effective chemical separation technology, ion exchange method has shown great separation selectivity. It has many merits, such as good deioned ratio, high recuperation of solution and easy of manipulation.Firstly, three samples were respectively characterized by EDS, XRD,FTIR and GC. The analysis indicated that the solution mainly contained of sodium chloride.There have not checked out chlorinous organism. The primary detection methods have been established by comparing analysis.Secondly, through anion static adsorption experiment four anion exchange resins-201×4, A600, A600DL and D296R were used to remove chloride ion in simulated ethylene glycol- salty solution. Adsorption capacity, work exchange content and exchange velocity were investigated. The two resins -201×4 and A600 have showed better capacity for the removal of chloride ion. In column dynamic adsorption experiment, two factors-flow velocity and column height-diameter ratio were investigated. The results showed the flow velocity of 8mL/min was properly. The results of 001×10-201×4 and C100E-A600 ion exchange fixed bed dynamic adsorption showed that chloride ion could be efficiently removed from simulated ethylene glycol-salty solution. The results of 001×10-201×4 were better. After adsorption, the concentration of chloride ion was below 25 mg/L, dechlorination rate was 99% and pH value was between 7.38 and 8.48 in the solution. The regeneration condition of 201×4 is convection, 8mL/min-1 of flow velocity, 4% sodium hydroxide and 3 bed volume. It had proved good stability of 201×4 resin after ten times of adsorption–and-desorption experiments.At last, the adsorption mechanism of resins was primarily studied by FTIR spectra and Raman spectra, and the result was in agreement with the study of static adsorption and the regeneration property of resins. The isothermal adsorption equations of four resins were established.Their adsorption was spontaneous exothermic processes. After the adsorption the chloride ion concentration in sample solution can achieve the relevant standard.Kinetic analysis showed that adsorption was mainly controlled by liquid film diffusion. |
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