Synthesis And Research Of Desulfurizers For Heavy Oil Recovery

Secondary H₂S of heavy oil thermal recovery was widespread at home and abroad, H₂S was a highly toxic and corrosive acid gases, and H₂S would corrode not only site equipment and pipeline and pollute the environment,but also could bring significant security hidden danger to mining transport process, serious threat to the personal safety of workers.Therefore,it urgently needed to remove H₂S in the process of heavy oil mining and transport.This article adopted the temperature tolerance stronger diethylene glycol amine ?DGA? as raw material, using aldehyde amine research a kind of synthesizing a new type groups of liquid triazine kind of desulfurizer ?DST?, Its high selectivity, high sulfur capacity, the absorption process is not reversible, the reaction product solubled in water easily removed, and the suitable temperature range is extensive, it had high desulfurization efficiency within the scope of 50-120?.Could be better adapt to the high temperature environment of heavy oil thermal recovery and transportation expecting H₂S.In this paper, The reaction product structure was confirmed by FTIR, GC, and 1H NMR, combining GC and H NMR quantified reaction results. Studing on reaction conditions by single factor method,and by response surface designs and methods for its further optimized,geting the best optimal synthesis conditions:the reaction temperature is 93?, reaction time is 3.5 h, the molar ratio of reactive substances ?DGA:formaldehyde? 13:4, adding ice acetic acid as catalyst and a small amount of ethanol to do aggregation inhibitors.Methods for evaluation of the H₂S removal of triazine were designed including static and dynamic H₂S removal. The main conclusion static experiments:When the temperature was 50-90 ?, the concentration of desulfurizer was 2%-5%, reaction time was> 4h, pH between 6-10, desulfurization efficiency was up to 95%. Solution pH and oil content had greater impact on the desulfurization agent, application should consider to add a certain amount pH stabilizer and enhanced desulfurizer liquid additives to enhance the effect. The main conclusion dynamic experiments:Temperature within the scope of the 50-120?, desulfurizer DST sulfur capacity has not obviously decline, stable at about 2.25 g; the higher the concentration of desulfurizer, the greater the sulfur capacity,when desulfurization agent concentration was 5%, the sulfur capacity can reach 2.52 g; N2 gas flow rate had greater impact,it was too high to the contact time was short and desulfurizer sulfur capacity decreased significantly. CO2 content impact on the sulfur content was very small, desulfurizer had high selectivity.Desulfurizer stability and compatibility test results showed that:In the 50-120? temperature range, the desulfurization efficiency of DST compared with the similar MEA-triazine desulfurizer is more stable, from 96% to 99%, at 120 ?, the desulfurization efficiency of DST is higher than that of MEA-triazine desulfurizer in 13.7%, Showing a stronger thermal stability, the temperature adaptation range is more extensive. The corrosion test showed that desulfurization agent DST can effectively reduce the liquid ?here is the use of produced water and condensate? H₂S content, and reduce H₂S for corrosion of steel sheet.