Method for preparing clean fuel oil from coal tar

Abstract

Belonging to the technical field of coal chemical industry and energy sources, the invention discloses a method for preparing clean fuel oil from coal tar. The method is characterized by: distilling coal tar to split into light oil and tower bottom heavy oil, subjecting the tower bottom heavy oil to delayed coking, then mixing it with coal tar and conducting distillation again, subjecting the light oil to high-pressure hydrogenation and catalytic distillation cracking to split it into distillate oil less than 180DEG C, distillate oil greater than 180DEG C and less than 360DEG C, and distillate oil greater than 360DEG C, letting the distillate oil less than 180DEG C directly enter a low-pressure gasoline hydrogenation reactor to undergo hydrofining so as to obtain high-quality gasoline, letting the distillate oil greater than 180DEG C and less than 360DEG C directly enter a low-pressure diesel oil hydrogenation reactor to undergo hydrofining to obtain high-quality diesel oil, mixing the distillate oil greater than 360DEG C with light oil and letting the mixture directly enter a high-pressure hydrogenation reactor to undergo reaction again. The catalytic distillation catalyst and the sulfide catalyst used in the invention select appropriate carriers and active components according to the composition and properties of coal tar. The method provided in the invention has a simple process, lowers equipment investment cost, employs catalysts with high activity and selectivity, has high yields of gasoline and diesel oil, provides a new approach for utilization of coal tar, and has good economic benefits and industrial application prospects.

Description

technical field [0001] The invention belongs to the fields of energy technology and environmental protection, and relates to a method for preparing clean fuel oil from coal tar. Background technique [0002] In the process of coal chemical industry, coal tar is one of the important products of coking industry, its output accounts for about 3%~4% of the furnace coal, its composition is extremely complex, and its annual output is about 15.00 Mt. According to the different coal carbonization temperature, it can be divided into high-temperature coal tar, medium-temperature coal tar and low-temperature coal tar. The composition and properties of the three are different, and their processing and utilization methods are different. At present, part of the high-temperature coal tar is used to extract chemical products, most of the medium / low temperature coal tar and a small amount of high-temperature coal tar are used as fuel for extensive combustion. Because coal tar contains a lar...

AI Technical Summary

Problems solved by technology

For the purpose of rational utilization of resources and environmental protection, there are many disadvantages in the coal tar process, such as high investment in high-pressure equipment, serious environmental pollution, low added value, low yield of gasoline and diesel, etc., throu...

Images