摘要
介绍了MTBE中硫的来源和形态,从整体上分析了脱硫后液化石油气在气体分馏装置和MTBE装置的富集现象,提出了浓缩倍数的概念。以催化汽油、重整汽油和MTBE三组分作为调合组分时,要满足调合汽油硫质量分数小于10μg/g的要求,重整汽油与MTBE的加入比例应满足(2.1～5.3)∶1。以某炼油厂实际情况为例,用PIMS程序模拟调合国Ⅴ95号汽油,当MTBE和催化汽油以及国Ⅴ调合汽油目标硫含量相同时,加入MTBE量最大,调合方案最灵活,经济效益最好;重整汽油加入量随着MTBE硫含量的增加而增加,MTBE加入量则不断减少,直至几乎不能加入(仅为1.5%);MTBE硫含量目标控制值受催化汽油硫含量变化的影响较大,以MTBE加入量的下限(8%)为判断依据,催化汽油硫质量分数由10μg/g降至8μg/g,MTBE硫质量分数目标控制值可由12μg/g放宽至30μg/g。但降低催化汽油的硫含量,可能导致辛烷值的下降。据此提出了如下降硫措施:采用优化MTBE原料、改进脱硫装置操作的方法,使MTBE硫质量分数降低到15～60μg/g;采用MTBE产品再蒸馏或C4原料蒸馏方法脱硫,可使MTBE硫质量分数降到10μg/g。经过比较认为,MTBE产品再蒸馏优于C4原料蒸馏。
The sources and forms of sulfur in MTBE are introduced. The sulfur concentration in LPG fractionation unit and MTBE unit are analyzed and concentration cycle concept is presented. When FCC gaso- line, reformate and MTBE are the blending components of gasoline, the blending ratio of reformate to MTBE shall be 2.1/1 - 5.3/1 to meet the 10 μg/g mass percentage of sulfur in blending gasoline. Based upon the gasoline quantity and quality of a refinery in China, the blending of Guo V 95 gasoline is simulated using PIMS computer program. The addition of MTBE and addition of reformate of different sulfur mass percentages are calculated. When the sulfur mass percentage of MTBE is the same as that of objective sulfur mass percent- age of FCC gasoline and Guo V gasoline, the MTBE addition is maximum, the blending is the most flexible and economic benefits is the highest. The addition of reformate increases with increase of sulfur mass percent- age of MTBE, and addition of MTBE is gradually minimized （ 1.5% ）. The controlled objective sulfur mass percentage of MTBE is affected by the sulfur mass percentage of FCC gasoline. When the minimum MTBE ad-dition is 8% , the st, lfur mass percentage of gasoline is lowered to 8 μg/g from 10 μg/g, and the controlled objective sulfur mass pereentage of MTBE increased to 30 p^g/g from 12 μg/g. Whereas, reducing the sulfur mass percentage of FCC gasoline may reduce the octane number of gasoline. The optimization of MTBE feed- stocks and optimization of operation of desulfurization unit can reduce the sulfur mass percentage in MTBE to 15 -60 μg/g. The application of distillation of MTBE product and distillation of C4s feedstock can lower the sulfur in MTBE to 10 p.g/g. The eomparison has found that the distillation of MTBE product is superior over distillation of C4s feedstock.
出处
《炼油技术与工程》
CAS
2013年第2期19-23,共5页
Petroleum Refinery Engineering
关键词
MTBE
国Ⅴ汽油
脱硫
汽油调合
MTBE, Guo V gasoline, desulfurization, gasoline blending
