The adsorption purification of gasoline fraction with NaX zeolites as a solvent for the production of high-density polyethylene at a large pilot plant with a layer height of the adsorbent layer from 1 to 8 m is considered. Removal of impurities of aromatic and unsaturated hydrocarbons, organosulfur impurities and water ensured the production of high-quality polyethylene. The main characteristics of the adsorption process (the dynamic activity of zeolite NaX, the length of the mass transfer zone) in a wide range of flow rates of the cleaned raw materials are determined, allowing the calculation of the adsorber without applying the principles of large-scale transition.
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Figure 1.
Scheme of pilot installation of adsorption purification of gasoline-solvent 1—adsorber, 2—sampler, 3—overflow system, 4—pump, 5—pressure gauge, 6—raw material tank.
Figure 2.
Dynamics of solvent gasoline purification (batch 6) in the system with the zeolite NaX layer height of 8 m at a raw material flow rate of 2.36 cm/min (the dotted line is the boundary of obtaining high-quality raffinate).
Figure 3.
To determination the point of the conditional breakthrough during the purification of gasoline-solvent by the concentration of aromatic hydrocarbons in the raffinate (1), the refractive index and the qualitative test for TiCl4 (2): if test is “Positive” then 〇 = 1, if test is “Negative” then 〇 = 0.
Figure 4.
Construction of the total (complete) isotherm of adsorption of aromatic hydrocarbons by zeolites under dynamic conditions according to the data of the isotherm of excessive adsorption from the liquid phase under static conditions. 1—isotherm of excessive adsorption of benzene from a solution in hexane under equilibrium static conditions, 2—isotherm of adsorption of aromatic hydrocarbons before their conditional slip into the raffinate for two batches of raw materials, 3—potential full activity of the sorbent, 4—total isotherm of sorption of aromatic hydrocarbons.
Figure 5.
The movement of the adsorption front along the height of the adsorbent layer of 8 m during the purification of gasoline-solvent (batch 6) at a flow rate of 7.84 cm/min (4.7 m/h) for different fixation time of the front τ: 1—τ = 3.5 h, 1—τ = 3.5 h, 2—τ = 5.5 h, 3—τ = 7.5 h, 4—τ = 7.75 h, 5—τ = 8.75 h, 6—τ = 9.75 h, 7—τ = 11.75 h.
Figure 6.
Dependence of the efficiency of using the potential activity of zeolite NaX on the increase of the height of the adsorbent layer. Lines—analytical calculation by (4): solid—n = 0.5, dashed—n = 0.4; points—experiment with batch 3 (⚫) and 6 (〇).