Study on Desulfurization of Crude Benzene with Microcrystalline Adsorbent

Abstract

An increasing number of coking enterprises are challenged by excessive sulfur content in their crude benzene products, which hinders sales and revenue. In this work, microcrystalline adsorbent was used to remove carbon disulfide and thiophene in crude benzene. BET, XRD, XRF and SEM characterization showed that the microcrystalline adsorbent has a large specific surface area, high crystallinity morphology, Si/Al ratio and regeneration stability. By investigating the effects of adsorption time, temperature, adsorbent dosage and regeneration times on the desulfurization performance of microcrystalline adsorbent W1, it was found that the desulfurization effect was mainly affected by time and temperature. When the experimental conditions at 20°C, 7 h, the amount of adsorbent was 4.5 g, the volume of crude benzene was 10 mL, resulting in desulfurization rate of 67% for thiophene, 52% for carbon disulfide, and 62% for total desulfurization, approximately 26% for crude benzene loss rate. The overall desulfurization rate remained stable around 55% after three regenerations, while the rate for rude benzene loss increased to roughly 30%. The results indicate that the microcrystalline adsorbent exhibits significant potential for desulfurization of crude benzene, providing valuable guidance and reference for coking enterprises.