摘要
以加入硫醇和H_2S的石油醚为液化石油气(LPG)的模拟原料,在固定床反应器中采用催化氧化的方法考察了LPG精脱硫过程中产生腐蚀的原因、影响精脱硫产物腐蚀性的因素以及硫化物的氧化反应机理。实验结果表明,影响精脱硫产物腐蚀性的主要因素为H_2S含量和反应温度,其次是液态空速,氧含量(实际供氧量与硫醇氧化理论需氧量的比值)对精脱硫产物腐蚀性的影响相对较小;反应温度越高,精脱硫产物腐蚀性越小;精脱硫产物腐蚀性随H_2S含量的增加而增大。较佳反应条件为:反应温度50℃、液态空速2 h^(-1)、氧含量1.1。在较佳反应条件下,当精脱硫产物铜片腐蚀级别合格时,原料中H_2S上限含量约为17μg/g。H_2S含量高于17μg/g时,硫化物的氧化反应产物含有较多的多硫化物、胶状单质硫和少量的硫代硫酸盐;H_2S含量低于17μg/g时,硫化物的氧化反应产物为短链多硫化物和硫代硫酸盐。
Petroleum ether added with certain amount of thiols and H2S was used as model of liquefied petroleum gas （LPG）. Causes of corrosion in fine desulfurization of LPG and the main factors affecting corrosiveness of product were investigated by catalytic oxidation of the above model feed using a fixed bed reactor. Oxidation mechanism of sulfide was also studied. The main factors affecting corrosion of product are reaction temperature and H2S content in the feed, while LHSV and oxygen content （ ratio of actual oxygen amount to theoretical oxygen amount for oxidation of thiols） show slight influence on the corrosion. Degree of corrosion will be lighter at higher temperature and will be more severe with rising of H2S content. Under optimal reaction conditions： temperature 50 ℃, LHSV 2 h^-1 and oxygen content 1.1 with upper limit of HzS content in feed about 17 μg/g, the level of copper strip corrosion can still meet requirement, but if HzS content is more than 17 μg/g, the main oxidation products of sulfides are polysulfide, colloidal sulfur and thiosulfate. The level of copper strip corrosion can no more meet the requirement. If H2S content is lower than 17 μg/g, polysulfide with shorter chain lengths and thiosulfate are main products.
出处
《石油化工》
CAS
CSCD
北大核心
2009年第9期966-970,共5页
Petrochemical Technology
关键词
液化石油气
精脱硫
腐蚀
硫化氢
liquefied petroleum gas
fine desulfurization
corrosion
hydrogen sulfide
