2 results about "Coal tar preparation" patented technology

This invention relates to the field of special fuel technology and discloses a method for preparing special fuels from coal tar, comprising: (1) performing a first fractionation on the raw coal tar to obtain a distillate oil with a distillation range of 180-420℃; (2) extracting the distillate oil to obtain an extract and a raffinate, and then performing adsorption separation on the raffinate to obtain a purified oil product; (3) optionally hydrorefining the purified oil product; (4) performing a second fractionation on the purified oil product and / or the hydrorefined product to cut it into No. 1 distillate oil, No. 2 distillate oil, and No. 3 distillate oil; (5) alkylating the No. 1 distillate oil to obtain No. 1 special oil; hydrosaturating the No. 2 distillate oil to obtain No. 2 special oil; and cracking cycloisomerizing the No. 3 distillate oil to obtain No. 3 special oil; and (6) then refining and blending. This method can flexibly prepare special fuels with different properties, and the fuel density and calorific value range are large.

The invention discloses a catalyst for preparing high-density special fuel from high-temperature coal tar as well as a grading method and application of the catalyst, and belongs to the technical field of preparation of high-density special fuel. The catalyst is composed of a hydrogenation protective agent, a hydrofining agent, a hydrocracking agent and a hydroisomerization agent; sulfur, nitrogen, oxygen, metal impurities, olefin and the like in the high-temperature coal tar are removed through catalyst grading of all bed layers in the reactor, aromatic hydrocarbon saturation, cracking and isomerization are carried out under proper process conditions, finally, the coal tar is purified, the oil quality is improved, and high-density special fuel is prepared. The catalyst has high catalytic efficiency for preparing high-density special fuel through hydrogenation of high-temperature coal tar, the yield of the high-density special fuel is high, the density can reach 901kg / m < 3 >, the low-temperature condensation point is-56 DEG C, and the calorific value is 42.6 MJ / kg. The grading mode of the catalyst has excellent hydrogenation activity and stability, the cracking degree is reduced, the saturated isomerization reaction is increased, and the high-density special fuel with higher yield can be obtained.