What is the pretreatment process for continuous reforming feedstock and what is its purpose?

The process is similar to that of hydrogenating regular gasoline and diesel; it mainly involves removing impurities and moisture! Ensure reformation feed parameters to prevent reformation catalyst deactivation! Protect the catalyst!

Water is removed from the feed tank first, and then it enters the deoxidation tower to remove dissolved oxygen. Then the temperature is increased in the hydrogenation reactor to remove impurities such as sulfur, nitrogen, oxygen, and olefins, thereby providing a suitable feed for reforming. After hydrogenation, the naphtha passes through a desulfurization tower and a fractionation tower, where the fractions are separated by cutting.

Function: Its main purpose is to provide suitable raw materials for the reforming reaction unit. Suitability is reflected in two aspects: first, the boiling range must be appropriate, which involves removing the light ends and heavy ends; light end removal takes place in the pretreatment distillation unit, while heavy end removal is generally carried out in the upstream atmospheric and vacuum distillation units (the final boiling point of the feed for reforming should not exceed 180°C). II. The impurity content is appropriate. The active component of the reforming catalyst is Pt, that is, platinum, which is extremely expensive. Therefore, any impurities that could be harmful to the catalyst must be removed in the pretreatment unit so that the catalyst meets the required standards; this process takes place mainly in the reactors used for pretreatment. Process: For this purpose, preprocessing generally includes a fractionation unit and a reaction unit. The processes can be divided into two categories: fractionation first followed by hydrogenation, or hydrogenation first followed by fractionation. In the process of fractional distillation followed by hydrogenation, the space velocity of the reactions is relatively low; the capacity of the plant is relatively high, but the light fractions contain impurities such as S and N ； Hydrogenation is carried out first, followed by distillation. Since the entire range is subjected to hydrogenation, the impurity content in the light fractions is very low, but the processing volume is small.