摘要
在固定床单柱吸附分离研究的基础上,通过程序控制的5A分子筛固定床双塔并联吸附分离试验装置,对中国石化上海高桥分公司石脑油中正构烷烃吸附/脱附分离过程进行连续操作,考察了多周期运转的吸附分离效果,并对工艺条件进行考察。研究结果表明,吸余油中正构烷烃含量经过5个吸附/脱附周期后趋于稳定,优化的吸附分离操作条件为:石脑油原料体积空速153.4h-1,吸附/脱附温度270℃,吸附/脱附切换时间30min,脱附气体体积空速127.5h-1,中间油切割时间2min。在该工艺条件下,稳定操作的吸余油中正构烷烃质量分数小于3%,芳烃潜含量比石脑油提高12.31百分点;脱附油中正构烷烃质量分数大于95%,作蒸汽裂解制乙烯原料时,与石脑油相比,乙烯收率提高约14百分点。
In order to make a better use of different components in naphtha to produce ethylene and aromatics based on the strategy of molecular scale management, studies on the adsorption separation of normal paraffins from naphtha using 5A molecular sieve in a double-column fixed-bed were carried out. After 5 adsorption/desorption circles optimal conditions for the adsorptio he adsorption separation process reached dynamic balance. The desorption process are an operation temperature of 270 ~C, a naphtha feed space velocity of 153.4 h-1 , a switch time of 30 minutes, an intermediate oil cutting time of 2 minutes and Nz flow rate of 127.5 h-1. The normal paraffin content in the raffinate oil is less than 3% and the potential aromatic content of the raffinate oil is 10% higher than that of the SGPC naphtha. The normal paraffin content in desorption oil is over 95%. The ethylene yield is improved by 13%- 14% using the desorption oil as stream cracking feed compared to the naphtha feed.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2013年第4期45-50,共6页
Petroleum Processing and Petrochemicals
关键词
石脑油
正构烷烃
双塔并联
吸附
5A分子筛
naphtha
normal paraffin
double-column fixed-beds
adsorption
5A molecular sieve
