Method for enhancing diesel/gasoline ratio in oil refining process

Abstract

The invention relates to a method for improving diesel-gasoline ratio during oil refining. The method comprises the following steps that: a distillation device of an oil-gas two-stage condensation cooling system is arranged on the top of a distillation tower; part of gasoline heavy distillate obtained after gasoline distillate flowing out from the tower top and non-condensable gas are subject to first-stage condensation and oil-gas-water separation is used for tower top reflux, thereby ensuring that diesel oil component in the gasoline distillate is fed into diesel oil distillate as mush as possible; therefore, the separation precision of gasoline distillate and diesel oil distillate is increased; moreover, under the condition of maintaining constant total light oil yield, diesel oil yield and the diesel-gasoline ratio are increased so as to meet the increasing requirements of market for diesel oil.

Description

technical field [0001] The invention relates to a distillation and separation process of petroleum hydrocarbons, in particular to a method for increasing the diesel-steam ratio in the oil refining process, and belongs to the technical field of petrochemical industry. Background technique [0002] Due to the impact of the economic consumption structure, the diesel-to-gasoline ratio (the ratio of diesel consumption to gasoline consumption) in my country's refined oil consumption market is relatively high, about 2:1 or more, much higher than the 1:1 in Europe and the 2:1 in North America. With the rapid development of the national economy, domestic diesel oil is increasingly in short supply. In the future, my country's economy will still maintain a high-speed development, and the number of diesel locomotives in the transportation sector will still maintain an annual growth rate of more than 9%, which will bring about demand for diesel oil. rapid growth. In recent years, althoug...

AI Technical Summary

Problems solved by technology

[0010] When the initial boiling point temperature T of the heavier component Ernst distillation H 0 Less than the temperature T of the end point of Ernst's distillation of the lighter components L 100 When , it means that the light and heavy fractions overlap, that is, a part of the heavy fraction enters the light fraction. If the difference between the two is large, it is considered that the fractionation accuracy is poor

[0011] Based on the analysis of this aspect, it can be seen that there is room for further strengthening in the design and operation of the atmospheric tower in the primary processing process of the current oil refining industry and the fractionating tower in the secondary processing process (such as the fractionating tower in the delayed coking process). It is the separation accuracy of adjacent fraction gasoline and diesel that needs to be further improved

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