Method for producing diesel fuel by using coal direct liquefication oil and delayed coking heavy diesel fuel fraction and application of method

Abstract

The invention provides a method for producing diesel fuel by using coal direct liquefication oil and delayed coking heavy diesel fuel fraction and application of the method. The method comprises the following steps of: a) mixing coal direct liquefication hydrogenation stabilization oil and the delayed coking heavy diesel fuel fraction; and b) performing hydrogenation modification on mixed oil obtained in the step a). A diesel fuel product produced by the method has a low condensation point, low content of sulfur, nitrogen and aromatic hydrocarbon, a high cetane value and a high lubricating property, and the quality of the product meets the standard of national IV diesel fuel; in addition, the delayed coking heavy diesel fuel fraction with higher sulfur content is mixed with the coal direct liquefication oil, so that the ratio of the content of S to the content of N in crude oil can reach 1:1-5:1; and the sulfur is not required to be additionally added into the crude oil, so that operation cost is reduced.

Description

technical field [0001] The present invention relates to a method for producing clean diesel for vehicles, in particular to a method for producing clean diesel for vehicles by using the mixed oil of coal direct liquefaction oil and petroleum refining delayed coking heavy diesel oil as raw material through hydrogenation and upgrading and its application. Background technique [0002] In 2009, China's dependence on foreign oil exceeded 50%. According to the current domestic economic development mode, the amount of oil needed in China in 2020 and 2030 is 530 million tons and 650 million tons respectively. However, domestic oil production is expected to begin to decrease after reaching its peak in 2015, and the peak output will not exceed 200 million tons, which means that the required external oil imports will increase. The domestic supply and demand gaps in 2020 and 2030 are respectively 336 million tons and 488 million tons. Experts in the industry believe that if the depen...

AI Technical Summary

Problems solved by technology

Although this technology can achieve the purpose of increasing the cetane number of diesel oil, there are still the following defects: In this technology, neither the hydrofining catalyst nor the hydroreforming catalyst has an ideal effect on the removal of aromatics in raw oil If the purpose of deeply dearomatized hydrocarbons is to be achieved, the operating pressure must be increased, the hydrogen consumption must be increased, and the reaction severity must be increased. On the one hand, this will increase the investment cost of the device and lead to an increase in the cost of producing high cetane number diesel oil. On the other hand, the The total aromatics content in the final prepared diesel product is still about 13m%, and the aromatics content is still relatively high

If the dry point of the hydro-upgrading raw material is too low, the components that can be cracked are less, resulting in a low cetane number of the product

From the perspective of group composition, the hydrogenated and stabilized coal direct liquefied oil has high aromatics content and low cetane number. After hydrogenation and upgrading, heteroatoms such as sulfur, nitrogen, and oxygen are removed, and most of the aromatics are also converted. For naphthenes, the cetane number has been improved to a certain extent, but due to the lack of paraffin components, the cetane number is still not high