35 results about "Coal tar preparation" patented technology

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.

The invention discloses a processing technology for preparing various pitches and fuel oils by coal tar, which comprises the steps that: the coal tar is heated to 350 DEG C to 360 DEG C, rectified at ordinary pressure first and then at reduced pressure, primarily ultracentrifugated and secondarily ultracentrifugated to respectively produce purified pitch, impregnating pitch, modified pitch, high softening point pitch and fuel oils. The invention has simple technology and convenient operation, can produce various high quality pitches and fuel oils and is characterized by less investment in devices and stable quality, thus better solving the problems of low general grade of pitches of China at present, unstable fraction of coal tar pitches and plenty of impurities and being quite applicableto the processing and producing of the coal tar.

The invention relates to a system and method for preparing coal tar, gas and semi-coke by activating coal gas and flash pyrolysing coal with a solid heat carrier. The system comprises a raw coal primary processing apparatus, a pyrolytic reaction separator, a semi-coke heating separator, a recycling apparatus, a coak tar recovering apparatus and a semi-coke cooling apparatus; a part of semi-coke powder discharged from the pyrolytic reaction separator enters the semi-coke heating separator, high-temperature smoke discharged from the semi-coke heating separator enters the recycling apparatus, the coal tar recovering apparatus produces coal tar and coal gas, and the semi-coke cooling apparatus produces semi-coke. In the existing coal tar preparation method, the coal pyrolytic optimization of the coal is not good, so that the existing coat tar preparation method has the technical problems of low oil yield, high investment and high energy consumption. The system for preparing the coal tar, gas and semi-coke by activating the coal gas and flash pyrolysing the coal with the solid heat carrier is rapid in pyrolysis, rapid in output and rapid in cooling.

The invention provides a method for preparing diesel oil for alpine regions with gas condensate and coal tar. The method comprises the following steps of: transferring the gas condensate under normal temperature to heating equipment to be heated, wherein the heating temperature is 60-180 DEG C; transferring the heated gas condensate to evaporation separation equipment to undergo evaporation separation to obtain light components and heavy components of the gas condensate; and blending the heavy components of the gas condensate, light oil fractions of the coal tar and a special additive and standing to obtain the diesel oil, wherein the specific steps are as follows: pumping the heavy components of the gas condensate, the light oil fractions of the coal tar and the special additive into a reaction kettle with a stirring device according to the predetermined weight percent, stirring the materials for 30-60min, discharging the product and storing the product in a storage tank statically for 24h to obtain the diesel oil; and the weight percents of the heavy components of the gas condensate, the light oil fractions of the coal tar and the special additive are respectively 20-70%, 20-60% and 10-20%.

The invention discloses a method for preparing diesel through coal tar. Hydrogen and the coal tar are distilled and mixed and then enter a reactor with the hydrogen and oil volume ratio of 850:1100. The reaction temperature is 290-365 DEG C, the reaction pressure is 2-9 MPa, and the air speed is 2-4 / h. A reaction is conducted under the action of catalyst, and a liquid product is obtained after gas-liquid separation.

The invention discloses a method for preparing diesel oil from coal tar. In the method, the coal tar and a catalyst are added into a reactor; after the reactor is closed, the temperature of the reactor is heated to 320-400 DEG C and the temperature is maintained for 0 to 20 minutes; after the temperature is reduced to the room temperature, a reactor product is taken out from the reactor; then distilling and separating are carried out; the cut fraction of 80 to 280 DEG C is taken out, thus obtaining the diesel oil. The method provided by the invention has the advantages of simple technique, low requirements to devices and high conversion rate. The invention belongs to the field of preparing diesel oil from coal tar.

The invention relates to a method for preparing special asphalt from coal tar through progressive separation. The method comprises the following specific steps: proportionally adding a mixed solvent Ainto the coal tar, carrying out stirring, carrying out standing, and carrying out layering, so as to obtain an upper-layer mixed solution A; taking the upper-layer mixed solution A, carrying out filtering, and carrying out distilling to recover the mixed solvent A, so as to obtain a first-stage separated product of the coal tar; proportionally adding a mixed solvent B into the first-stage separated product of the coal tar, carrying out stirring, carrying out standing, and carrying out layering, so as to obtain an upper-layer mixed solution B; taking the upper-layer mixed solution B, and carrying out distilling to recover the mixed solvent B, so as to obtain a light component of the coal tar; proportionally adding a mixed solvent C into the light component of the coal tar, carrying out intensive mixing, carrying out standing, and carrying out layering, so as to obtain an upper-layer mixed solution C; taking the upper-layer mixed solution C, carrying out filtering, and carrying out distilling to recover the mixed solvent C, thereby obtaining the special asphalt. According to the method, the special asphalt can be obtained from the coal tar through progressive separation at normal temperature under normal pressure and can be applied to high-end carbon-material raw materials, and the requirements of subsequent preparation on products with high added values are met.