The treatment of concentrated wastewater produced in the oil field was studied via self-made oily-water segregator. This laboratory apparatus comprises corrugated plate with pressurized dissolved-air flotation technology. The effects of the oil concentration of wastewater and influent flow on the removal efficiency of oil were mainly investigated. When the temperature is 50 ℃, influent flow rate is 70 L/h, the coalescence plate is coated by the galvanized paint, the removal efficiency of oil is up to 86.4%.

 

Preparation of solid acid catalyst from AlCl3 Lewis acid and montmorillonite by ion exchange method, the effect of modification conditions and exchanger types on catalytic results were also studied. All kinds of physical properties of montmorillonite before and after modification were measured by XRD, shows that the original soil, after treating with Lewis AlCl3, expand its layer space from 1.471 3 to 1.522 5 nm, the surface area of 120 to 239 m2/g, pore volume from 0.140 mL/g to 0.322 mL/g. The catalytic reaction on synthesis of ethylene glycol shows that the optimum condition is as follow: reaction temperature 65 ℃, reaction time 30 min, the amount of catalyst 4%, the ratio of methanol to epoxyethane 4∶1 under normal pressure. In this process, the yield of glycol ethers was 90.5%, conversion rate of ether was 96.0%, the selectivity for single-ether 94.2%, which testified solid acid catalyst is good for synthesis of ethylene glycol.

An imidazoline corrosion inhibitor was synthesized from diethylenetriamine and oleic acid using dimethylbenzene as a water carrying agent, and the synthetic reaction conditions, molecular structure and corrosion inhibiting capability to boiler water system were studied. Results show that the optimized parameters for the synthesis is as follows: the molar ratio of oleic acid to diethylenetriamine is 1∶1.4, the volume ratio of dimethylbenzene to reacting mixture is 1∶5 , temperature is programmed raised from 145 ℃ to 210 ℃, the reflux time is 8 h. under the optimum conditions, the yield is up to 96.5%, corrosion inhibition efficiencies on carbon steel is over 90% with imidazoline derivative concentration of 20 mg/L in boiler solutions．The imidazoline derivative was found to inhibit anode corrosion reactions greatly, and also to inhibit cathode corrosion to some extent, so it can be classified as a passivating anodic-type corrosion inhibitor. The mechanism of corrosion inhibition relies on the strong absorption of the imizadoline on metal surfaces which can prevent metal surface from contacting with water．