System and method for preparing high-octane gasoline, aviation kerosene and naphthenic base oil with total-hydrogen-type coal tar

Abstract

The invention relates to a system and method for preparing high-octane gasoline, aviation kerosene and naphthenic base oil with total-hydrogen-type coal tar. The system is formed by a coal tar refining device, a distillate oil deep refining, isomerization-visbreaking and post-refining device and a naphtha dehydrogenizing and aromatic extraction device. The method includes the steps that coal tar serves as a raw material, is subjected to hydrorefining, deep refining, isomerization visbreaking and post-refining treating, and then is subjected to a naphtha dehydrogenizing technology and an aromatic extraction technology, and the high-octane gasoline, the aviation kerosene and the naphthenic base oil are obtained. Meanwhile, a mass of hydrogen is generated to serve as supplemented hydrogen of coal tar hydrogenation, the obtained product oil is good in quality, and after detecting is carried out according to the national standard, various detected indexes meet the national standard.

Description

technical field [0001] The invention belongs to the field of coal tar hydrogenation, and in particular relates to the preparation of high-octane gasoline and aviation fuel by hydrogenation of full-fraction medium-low temperature coal tar, partial medium-low temperature coal tar fraction oil, high-temperature coal tar fraction oil or anthracene oil before 510°C and naphthenic base oil process systems, catalyst grading schemes and processing methods. Background technique [0002] Coal tar is a liquid product of coal pyrolysis, containing a large amount of polycyclic and heterocyclic aromatic hydrocarbons such as oxygen, nitrogen, sulfur, and metals, and colloids and asphaltenes account for more than 50%, nitrogen content exceeds 1.2%, and oxygen exceeds 6 %, the molecular structure and composition are complex, and the content of metal ions, especially iron, calcium, and magnesium ions, is high. Coal tar hydrogenation technology is to remove metals, sulfur, nitrogen and other c...

AI Technical Summary

Problems solved by technology

However, although the hydrorefining process effectively prolongs the operation cycle through catalyst grading and process control, due to the complexity of the coking precursors of coal tar, the rapid rise in bed pressure of the first reactor for tar refining affects the operation cycle. Deep refining, hydrogenation isomerization, and post-refining are divided into two stages, and high-pressure equipment such as circulating hydrogen compressors, heating furnaces, high / low fractionation, and high-pressure feed pumps are added, resulting in excessive investment and high operating costs.

At the same time, the cut 180-280 ℃ after hydrofining is used as diesel oil, the freezing point is lowered, but the cetane number is low, and it cannot meet the national V diesel oil standard

[0008] Patent 201310103189.2 The method for producing fuel oil and lubricating oil base oil by hydrogenation of full fraction coal tar can produce naphthenic lubricating oil base oil with high viscosity index while producing fuel oil, but the product solution is limited and cannot be based on the market Make the best use of its own characteristics

Images