NTS螯合剂的合成与EDTA配位铁脱硫协同效应评价

Synthesis of NTS chelating agent and its desulfurization synergistic effect evaluation with EDTA coordination iron

在塔里木油田原油开采过程中,地层产出液矿化度很高,很多油井带有大量的硫化氢、二氧化碳、氯离子、游离氧等侵蚀性物质,对井口设备、井下采油套管以及油气集输系统会造成严重腐蚀,甚至引发严重事故。为了缓解油田设备因硫化氢腐蚀引起的问题,本文通过有机合成方法制备了EDTA铁铵、NTS,并与三乙胺、DMF复配形成脱硫剂,通过碘量法测定脱硫率,探究了脱硫剂在油田模拟水中最佳脱硫浓度。实验得出制备NTS的最佳条件:氯乙酸、氯化铵配料摩尔比为3∶1.02、反应温度为70℃、反应时间2h,pH值控制在1.0左右。脱硫实验中得到,脱硫剂在模拟水中的比例为10%时,脱硫效果最好,最高脱硫率达98.01%。合成制备的复合型绿色脱硫剂脱硫效果较好,将有望应用于输油管道脱硫,解决由于硫化氢造成的管路腐蚀问题。

In the crude oil mining process of Tarim Oilfield,the salinity in formation produced fluid salinity is high and the oil wells are filled with a lot of aggressive substances,such as hydrogen sulfide,carbon dioxide,chloride ions,and free oxygen. They cause severe corrosion to hole production casing,wellhead equipment,oil and gas the gathering system,and even cause a serious accident. In order to alleviate the problems of oilfield equipment due to the hydrogen sulfide corrosion,in this experiment we used the organic synthesis method to prepare a solution formed desulfurizer complex with NTS,iron EDTA amine,triethylamine,and DMF,and investigated the optimal proportion of complex by iodometry. Also,we explored determined the best desulfurization concentration of the compound agents in the simulated water with different sulfur contents by iodometric method. Experiments showed the optimal condition for the preparation of NTS as follows:ingredient ratio of chloroacetic acid and ammonium chloride=3∶1. 02 (mole ratio),reaction temperature of 70℃, reaction time 2 hours,and pH of 1.0. Desulphurization experiment showed that the concentration of desulfurization agent in simulated water is 10%and the desulfurization effect is best when the highest desulfurization rate is 98.01%. Compound for synthesizing green desulfurizer has very good desulfurization effect,therefore it is expected to be applied in pipeline desulphurization toprevent hydrogen sulfide pipeline corrosion.