气体分离装置碳五组分进烷基化装置加工的方法实践  

INDUSTRIAL PRACTICE OF ALKYLATION UNIT FOR ADDING C_(5) FRACTION FROM GAS-FRACTIONATED UNIT

作　　者：刘健[1] 杨跃进 牛东会 向杰 Liu Jian;Yang Yuejin;Niu Donghui;Xiang Jie(SINOPEC Luoyang Company,Luoyang,Henan 471012)

机构地区：[1]中国石化洛阳分公司,河南洛阳471012

出　　处：《石油炼制与化工》2024年第8期38-44,共7页Petroleum Processing and Petrochemicals

摘　　要：为了拓宽SINOALKY硫酸法烷基化装置原料适应范围,提高烷基化油收率,解决夏季汽油蒸气压高的问题,某石化公司进行了烷基化装置掺炼少量气体分离装置碳五组分(气分碳五)的工业实践。2021年8月发现烷基化装置反应器进料管线压差异常升高0.6 MPa,通过现场逐段测压判断出堵塞部位为烷基化反应器进料管线及相关设备。经过多种方法的检测分析,判断出烷基化反应器进料管线及设备压差升高的主要原因是气分碳五中含有微量N-甲基二乙醇胺杂质,该物质与循环异丁烷中的二氧化硫反应,生成棕黄色的亚硫酸胺盐,造成进料管线及相关设备堵塞。通过创新流程设施,增设气分碳五水洗和聚结脱水流程,经过生产实践证明该气分碳五加工方法脱杂质效果良好,气分碳五水洗罐中水洗水及中和池总排口水样氮质量浓度分别稳定控制在126.2 mg/L和47.5 mg/L左右,中和池总排口水样pH稳定在6~7,在水洗污水排放指标符合要求的同时,所得烷基化油产品质量也达标,成功实现了气分碳五连续掺炼,为该气分碳五加工方法的研究和推广应用提供了强有力的理论支撑。In order to widen the range of SINOALKY sulfuric acid alkylation unit feedstock,improve the yield of alkylated oil and solve the problem of high vapor pressure of gasoline in summer,a petrochemical company has carried out the industrial practice of adding a small amount of gas-fractionated C_(5)fraction into the alkylation unit.In August 2021,it was found that the pressure difference in the reaction feed pipeline of the alkylation unit was abnormally increased by 0.6 MPa.The site pressure measurement showed that the blockage was in the reaction feed pipeline of the alkylation unit and the related equipment.Through the detection and analysis of various analysis methods,it was determined that the main reason for the increase of pressure difference in the feed pipelines and equipment of the alkylation reactor was that there were trace impurities of N-methyldiethanolamine in the C_(5)fraction.Those trace impurities reacted with the sulfur dioxide in the circulating isobutane to form a brownish-yellow amine sulfite salt,resulting in the clogging of the feed pipeline and equipment.Through the innovation of process facilities,the addition of gas-fractionated C_(5)water washing and agglomeration dewatering process,the production practice has proved that this gas-fractionated C_(5)processing method had a good effect on removing impurities.The mass concentration of nitrogen in the washing water and the total outlet of the neutralization tank was controlled at 126.2 mg/L and 47.5 mg/L,respectively.The pH of water samples from the total discharge of the neutralization tanks was stable at 6-7.At the same time,the quality of the alkylated oil product was also up to the standard,and the continuous blending of gas-fractionated C_(5)has been successfully realized.It provides a strong theoretical support for the research and application of this method.

关 键 词：硫酸法烷基化 气分碳五 原料 杂质 堵塞 水洗 

分 类 号：TQ051.8[化学工程]