Pervaporation performance of crosslinked polyethylene glycol membranes for deep desulfurization of FCC gasoline

Pervaporation performance of crosslinked polydimethylsiloxane membranes for deep desulfurization of FCC gasoline: I. Effect of different sulfur species

Effect of crosslinking on sorption, diffusion and pervaporation of gasoline components in hydroxyethyl cellulose membranes

Cross-linked polydimethylsiloxane (PDMS)–polyetherimide (PEI) composite membranes were prepared, in which asymmetric microporous PEI membrane prepared with phase inversion method was acted as the microporous supporting layer in the flat-plate composite membrane. Membrane characterization was conducted by Fourier transform infrared and scanning electronic microscopy analysis. The composite membranes were employed in pervaporation separation of n-heptane–thiophene mixtures. Effect of amount of PDMS, cross-linking temperature, amount of cross-linking agent, and cross-linking time on the separation efficiency of n-heptane–thiophene mixtures was investigated experimentally. Experiment results demonstrated that 80–100°°C of cross-linking temperature was more preferable for practical application, as the amount of cross-linking agent was up to 20 wt.%, and 25 wt.% of PDMS amount was more optimal as far as flux and sulfur enrichment factor were concerned. In addition, the swelling degree of and stableness of composite membrane during long-time operation were studied, which should be significant for practical application.

Pervaporation Separation of Thiophene–Heptane Mixtures with Polydimethylsiloxane (PDMS) Membrane for Desulfurization

Pervaporation separation of ethyl thioether/heptane mixtures by polyethylene glycol membranes

With the gradual strictness of the environmental laws,the requirement for the quality of gasoline is getting higherIt has resulted in a continuing world wide effort to reduce sulfur levels in gasolineThe reducing of gasoline sulfur is considered to be an effective means for improving air qualityThe desulfurization technology has become a key technology in various oil refinery enterprisesSulfur compounds in gasoline come mainly from FCC(Fluid Catalytic Cracking),so research and development of FCC gasoline desulfurization technology are very importantAt present,technologies of reducing sulfur content of FCC gasoline include FCC raw oil hydrodesulfurization,FCC gasoline hydrodesulfurization,solvent extraction desulfurization,catalytic cracking desulfurization,oxidative desulfurization,biodesulfurization,and adsorption desulfurizationThe paper reviews advances in FCC gasoline desulfurization technologies at home and abroad

Advances in desulfurization of FCC gasoline

By experiment of adsorptive desulfurization on FCC gasoline, the effects of adsorption temperature,adsorption pressure, tail gas amount and regeneration times of adsorbent on sulfur content of FCC gasoline, octane number and once-through life of adsorbent are discussed. The experimental results show that the preferable process conditions are adsorption temperature 360℃, adsorption pressure 0.3MPa, tail gas 300mL/min, volume space velocity 1h~(-1). By analyzing tail gas of adsorptive desulfurization experiment, the mechanism of adsorptive desulfurization of FCC gasoline is explained.

Study on adsorptive desulfurization of FCC gasoline

The experiment of adsorptive desulfurization for FCC gasoline was carried out in fixed bed adsorption(unit).The effects of the process conditions of adsorptive desulfurization on sulfur content of FCC gasoline,octane number and once-through life of adsorbent were investigated.The experimental results show that the preferable(conditions) for adsorptive desulfurization are adsorption temperature of 360 ℃,adsorption pressure of 0.3 MPa,(hydrogen) volumetric flow rate of 300 mL/min,volume space velocity of 1.0 h~(-1).By analyzing tail gas of adsorptive desulfurization experiment,the mechanism of adsorptive desulfurization of FCC gasoline is explained.

Chen Huan-zhang

Papers

Advances in desulfurization of FCC gasoline

Study on adsorptive desulfurization of FCC gasoline

Study on adsorptive desulfurization of FCC gasoline