3 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.

The present invention provides a gas-liquid-solid three-phase feeding device, which relates to the technical field of preparing carbon black from coal tar, including a gas feeding structure, a liquid atomizing feeding pipe and a solid feeding pipe, wherein the gas feeding structure includes an air distribution cavity and an air outlet end, wherein the air outlet end is located at the bottom of the air distribution cavity, the liquid atomizing feeding pipe and the solid feeding pipe are arranged through the air distribution cavity, and the first discharge end of the liquid atomizing feeding pipe, the second discharge end of the solid feeding pipe and the air outlet end are arranged on the same end face, and the air outlet radiation range of the air outlet end covers the first discharge end and the second discharge end. The present invention is designed so that the liquid raw material and the solid raw material are surrounded by the gaseous raw material, thereby providing favorable conditions for the full mixing of the gas-liquid-solid three-phase raw materials, effectively improving the poor atomization effect of the viscous coal tar, the insolubility of the solid catalyst in the coal tar, and the uneven mixing of the gas, liquid and solid three-phase reactants in the process of preparing functional carbon materials by pyrolysis of coal tar, thereby improving the quality of the carbon black product.