Study On Desulphurization From Benzene Product From Coking Production

Carbon disulfide in benzene product from coking production is removed by adsorption and thiophene is removed by .reaction and distillation in this thesis after evaluating various methods for removal of carbon disulfide and thiophene in benzene product from coking production. Low energy consumption, deep refinement and convenient operation as well as no waste characterize adsorption. Distillation is characterized by less quantity of sulphur acid and easy operation as well as high refine extent.It is effective for carbon disulfide and thiophene in benzene to be measured by spectrophotometer. Operation of the experiment is easy, high-speed, and the precision is high.Correlative coefficient of standard curve can reach above 0.99.Granule activiated carbon, which has larger surface area and lacuna radio has been adopt to adsorb carbon disulfide. The result shows that low temperature favors the adsorption process. In the static adsorption experiment, as to 0.001g/100mL carbon disulfide-benzene solution, at 22 C, adsorption ratio can reach above 74%. After adsorption, the residual amount of carbon disulfide occurring in benzene is less than 3 10-6g/g. Freundlich adsorption formula of the adsorption experiment is q = 0.047c0.3853 The adsorption neat is 597.9J/mol, which prove the adsorption belongs to typical physics adsorption. In the dynamic adsorption experiment, at 26 C, on the condition of flow ratio 2. 12 10-4m3/m2s, bed height 25cm, saturation adsorption quantity is 0.07536mg/g. Adsorption kinetics can be described by Elovich equation, and mass transfer coefficient is the largest at the flow ratio of 2. 12 X 10-4m3/m2s. Activiated carbon after adsorption can be regenerated by hot N2. At the temperature of 400 C and time of 1h, after three period of adsorption regeneration, dynamic saturation adsorption quantity of activiated carbon can reach above 90% of which of initial activiated carbon.In the reaction and distillation experiment, as to 400mL benzene product from coking production (containing thiophene 0.030g/100mL), at the conditions of height of glass column packing 40cm, 80mL sulphuric acid and reflux controlled by manual work, the removal ratio of thiophene can be up to 94%, and the quality content of thiophene in benzene product from coking production is less than 2 10-5g/g. As to the same quantity benzene product from coking production, 58.33% sulphuric acid has been saved. In the production, the quantity of sulphuric acid is reduced obviously, so the cost of production is reduced greatly. Moreover, heat burden in the bottom of tower and energy consumption is reduced too. In addition, along with the quantity of sulphuric acid is reduced, the quantity of waste acid is reduced correspondly, and the difficulty of disposed work and enviroment protection is shortened.