Reasons for the appearance of oil beans in the paraffin dewaxing unit

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This post was last edited by anna1999 on 2020-2-12 at 21:56. It discusses the issue of oil beans in benzene co-distillation units, and summarizes the reasons for the occurrence of oil beans during the operation of such units. Specifically: \"Quenching\" and \"allergies\" can lead to the formation of oil beans. 1. Quenching: Quenching often occurs at the point where the diluent is added; for example, the temperature of the primary and secondary solvents is usually 2–3°C lower than the temperature at the addition point. If this difference is too large, quenching may occur in severe cases ； Another location where rapid cooling occurs is at the junction of the various flow sleeves, that is, at the point where the secondary ammonia cooling outlets meet. If there is a large temperature difference between these flow sleeves, rapid cooling will also take place upon their convergence; generally, the temperature difference between the various flows should not exceed 2–3°C. The soybeans showing quenching phenomenon are larger in size. 2. Allergies: Allergic reactions occur due to an excessive difference. As the content increases, the solvating capacity of the mixed solvent for oil decreases; when this content exceeds a certain limit, a second liquid phase appears in the mixture of the raw material and the solvent (normally there is a solid phase of solvent and wax, as well as a liquid phase of solvent and oil). This second liquid phase is dominated by oil, with the oil encapsulating the solvent. After being stirred by the scraper in the sleeve, this second liquid phase disperses throughout the medium in the form of small oil droplets, in relatively large quantities. When a large number of small oil beans appear on the filter, an allergic reaction should be suspected. The above information comes from the WeChat official account: Petrochemical Engineering Guest