Abstract
An integrated process for separation and utilization of light naphtha stock in refineries is discussed in this paper. Normal paraffins present in light naphtha streams are first separated from nonnormal paraffins by adsorption technology. The adsorbed n-paraffins are recovered and can be used as an ideal feedstock for steam cracking, meanwhile iso-pentane or iso-pentane and iso-hexane blends are recovered by rectification of the nonadsorbed effluent and used as necessary components for modern gasoline or aviation gasoline products. From the results for a model feedstock, an isothermal adsorption and purging desorption approach is selected. Optimum parameters consist of adsorption and desorption duration of 30 min at 180℃ for each, nitrogen stream LHSV of 240 h−1 in the desorption step, the dynamic capacity of the adsorbent reaches 0.042 g/g.
Highlights
Global production of hydrocracking and reforming units in petroleum refineries has reached 290 and 505 Mt/a, respectively, in 2014
To simulate pentane and hexane concentrations in the typical light naphtha stocks from hydrocracking and reforming units as shown in Table 1, a solution, which is composed of pentane, hexane, and cyclohexane at a ratio of 1:1:8, respectively, is initially used as a model compound in this work
An integrated process for separation and utilization of light naphtha stock is proposed in this paper
Summary
Global production of hydrocracking and reforming units in petroleum refineries has reached 290 and 505 Mt/a, respectively, in 2014. Keywords Light naphtha, adsorption, hexane, pentane, aviation gasoline Reagents, including pentane, hexane, and cyclohexane are all analytical reagents and are produced by Shanghai Lin Feng Chemical Inc. To simulate pentane and hexane concentrations in the typical light naphtha stocks from hydrocracking and reforming units as shown, a solution, which is composed of pentane, hexane, and cyclohexane at a ratio of 1:1:8, respectively, is initially used as a model compound in this work.
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