3results about How to "Avoid secondary reactions" patented technology

The utility model discloses a biomass thermal cracking three-phase product high-efficiency separation device which comprises a cracking assembly which comprises a sliding rail type tubular furnace, and biomass raw materials are heated to a set cracking temperature through the sliding rail type tubular furnace and generate mixed products of gas, liquid and solid particles; the cooling assembly comprises a snakelike condenser and a liquid phase collecting bottle, and liquid phase components in the mixed product are separated through the snakelike condenser and stored in the liquid phase collecting bottle; the detection assembly comprises an on-line infrared gas analyzer, and gas components in the mixed product are detected through the on-line infrared gas analyzer; the purification assembly comprises an ethanol solution bottle and an aqueous solution bottle, alcohol-soluble gas components in the gas-phase components are absorbed through an ethanol solution in the ethanol solution bottle, and water-soluble gas components in the gas-phase components are absorbed through an aqueous solution in the aqueous solution bottle. According to the utility model, efficient separation of three-phase products of biomass thermal cracking is realized.

This invention discloses a method for the conversion of C8 mixed aromatics. The method includes the following steps: the C8 mixed aromatics react under the action of a catalyst, and the reaction conditions are as follows: reaction temperature of 385–420℃, preferably 390–410℃; pressure of 1.0–2.0 MPa, preferably 1.0–2.0 MPa; hydrogen / hydrocarbon molar ratio of 1–3, preferably 1.5–2.5; and feed mass hourly space velocity of 7–12 h⁻¹. ‑1 8-10 hours is preferred. ‑1 The catalyst has mesopores with a pore size of 3-6 nm accounting for 45-85% of the total pore volume, preferably 50-75% of the total pore volume. This method enables xylene isomerization into an equilibrium mixture, while more effectively removing alkyl groups from the ethylbenzene side chain.

This invention provides a dual-catalyst catalytic cracking unit for improving the yield of low-carbon olefins and gasoline / diesel, comprising: a riser reactor, a fluidized bed reactor, a settler, and a fractionating tower. The riser reactor includes a first reaction zone and a second reaction zone, with an enlarged diameter second reaction zone added above the first reaction zone, which is beneficial to the yield of ethylene, propylene, and low-carbon olefins. The enlarged diameter of the second reaction zone compensates for the riser height, facilitating the secondary modification of existing risers. Due to its compact structure, it effectively reduces the need for fuel supplementation in the regenerator, thus lowering energy consumption.