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Study on adsorption and separation performance of molecular sieve adsorbents for different types of diesel
Received date: 2023-05-17
Online published: 2024-03-14
The molecular sieve adsorbent was prepared by using ion exchange method，the characterization results of the molecular sieve adsorbent showed that，the pore structure of molecular sieve adsorbents was mainly composed of intracrystalline micropores and intergranular mesopores，with the characteristics of high crystallinity，uniform grain distribution，and synergistic effect of weak and strong acids.Different types of diesel oil were used as raw materials of adsorption，the desorption agent was a lightweight desorption agent（with a boiling point lower than diesel），by using the simulated moving bed，investigating on the adsorption and separation performance of molecular sieve adsorbents for different types of diesel fuels.The result showed that，when the adsorption temperature was 120 ℃ and the pressure was 1.2 MPa，reflux ratio of adsorption zone was 0.5~1.5，reflux ratio of refining zone was 0.2~1.5，reflux ratio of desorption zone was 2.0~6.0，reflux ratio of isolation zone was -2~0，molecular sieve adsorbents operated stably under different types of diesel adsorption-desorption systems，the aromatics content of the aromatics product was more than 95％，non-aromatic content of non-aromatic product was more than 95％.Sulfur and nitrogen content，distillation range light and heavy and hydrocarbon composition in different types of diesel oil had no effect on separation purity.The higher the aromatics content in different types of diesel fuel，the higher volume ratio of desorption agent to diesel fuel.Under simulated industrial application conditions，the molecular sieve adsorbent run stably for over 600 d.Therefore，it could be seen that molecular sieve adsorbents had the characteristics of high aromatics selectivity，large adsorption capacity，and high operational stability.
ZHAO Chuang , CHEN Zihao , ZHANG Boyu , LI Ben , JIN Fengying , LI Bin , SUN Zhenhai , GUO Chunlei . Study on adsorption and separation performance of molecular sieve adsorbents for different types of diesel[J]. Inorganic Chemicals Industry, 2024 , 56(3) : 80 -85 . DOI: 10.19964/j.issn.1006-4990.2023-0272
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