石蜡基润滑油基础油高压加氢装置运行分析及改进建议

OPERATION ANALYSIS AND COUNTERMEASURES OF HIGH PRESSURE HYDROGENATION UNIT FOR PARAFFINIC LUBE BASE OIL PRODUCTION

对某石蜡基润滑油高压加氢装置基础油收率低、减四线重润滑油产品部分指标不合格等问题进行了分析。结果表明:进料中较多不易脱除的大分子氮化物的存在增加了裂解反应,降低了基础油收率;进料中高含量且多以环状形式存在的蜡增加了异构难度,致使降低基础油倾点和浊点困难,并进一步加剧了裂解反应和基础油收率的降低。在原因分析的基础上提出了降低空速、延长减三线油加工时间和降低减四线油进料终馏点等短期改进措施,以及掺炼其它原料、筛选合适原油和采用更高效催化剂级配方案等中长期解决方案。

The high-pressure hydroprocessing unit for production of paraffinic lube base oil in CNOOC is a key unit for company’s benefit.The problems of low yield of base oil,and unqualified heavy product in some indicators appeared in operation.This paper analyzes the causes of the problem.The results showed that the presence of large nitrogen compounds in the feed,which are difficult to remove,increases the cracking reaction and reduces the base oil yield.The high content of naphthene in the feed add the difficulty for isomerization,and aggravate the cracking reaction,leading to a low base oil yield,and a higher pour point and turbidity point.Some short-term improvement measures,such as reducing space velocity,processing more VGO from the 3rd sideline and lowering the final boiling point of VGO from the 4th sideline were proposed.The measures of using appropriate crude oils,blending feeds and adopting more efficient catalyst grading are suggested for medium and long term production.