气相色谱法测定合成气制烯烃水相产物中低碳醇、醛、酮、酸化合物

采用气相色谱法建立了合成气制烯烃（SGTO）水相产物中低碳醇、醛、酮、酸的测定方法,对分离条件进行优化,使用标准试样测定了线性范围和工作曲线,考察了方法的精密度和准确度,并采用该方法对SGTO实际水相产物中低碳醇、醛、酮、酸进行了测定。实验结果表明,在一定质量浓度范围内,低碳醇、醛、酮、酸各组分均呈现良好的线性关系,相关系数大于0.99。标样的回收率在93.4%~109.8%之间,6次重复测定的相对标准偏差小于3.9%。SGTO实际水相产物中低碳（C1~6）醇、醛、酮、酸的分析结果表明,SGTO实际水相产物中低碳（C1~6）醇、醛、酮、酸的总含量（w）在1.5%~3.0%之间;其中,乙醇的含量最高,丙酮其次。

气相色谱法测定费托合成水相产物中的低碳醇、醛、酮化合物

建立了铁基催化剂费托合成反应水相产物中低碳（C1-C8）醇、醛、酮的气相色谱测定方法。对色谱分离条件进行了优化，确立了以乙醇为基准物质并结合各组分校正因子的定量方法；考察了方法的精密度和准确度，并对费托合成反应水相产物样品进行了测定。结果表明，乙醇在不同的含量范围内呈现良好的线性关系，相关系数均大于0.99。费托合成水相产物中的加标回收率在93.4％-109.6％之间，准确性可以满足实际分析的需要。实际费托合成水相产物的分析结果表明，费托合成水相产物中主要的低碳醇、醛、酮的总质量分数约为3％-12％，乙醇含量最高（约为1.7％-7.3％），且正构醇、异构醇和醛酮类化合物所占的总比率依次降低。该方法简单、快速，对费托合成水相产物中重要组分的分析有重要意义。

Inhibition effect of a synthesized N,N′-bis(2-hydroxybenzaldehyde)-1,3-propandiimine on corrosion of mild steel in HCl

The corrosion inhibition of mild steel in 1 mol/L HC1 by N, N＇-bis （2-hydroxybenzaldehyde）- 1, 3-propandiimine （2-HBP） has been investigated by using potentiodynamic polarization, electrochemical impedance spectroscopy （EIS） and chronoamperometry measurements. The experimental results suggest that this compound is an excellent corrosion inhibitor for mild steel and the inhibition efficiency increases with the increase in inhibitor concentration. Polarization curves reveal that this organic compound is a mixed type inhibitor. The effect of temperature on the corrosion behavior of mild steel with the addition of the Schiff base was studied in the temperature range from 25 ℃ to 65℃. The experimentally obtained adsorption isotherms follow the Langmuir equation. Activation and thermodynamic adsorption parameters such as Ea, △H, △S,Kads and AG,ds were calculated by the corrosion currents at different temperatures and using the adsorption isotherm. The morphology of mild steel surface in the absence and presence of 2-HBP was examined by atomic force microscope （AFM） images.