12results 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.

The invention discloses a nickel-loaded hierarchical porous SAPO-34 catalyst and a preparation method and application thereof.The method comprises the steps that an aluminum source is added into a water solution of a phosphorus source, stirring is conducted, then a template agent and a silicon source are added, stirring and uniform mixing are conducted, and a precursor solution is prepared; carrying out hydrothermal reaction treatment on the precursor solution, and calcining a product to prepare an original SAPO-34 carrier; the preparation method comprises the following steps: putting an original SAPO-34 carrier into an organic acid solution, stirring, and drying and calcining to obtain an acid-treated SAPO-34 carrier; and adding the SAPO-34 carrier subjected to acid treatment into a Ni (NO3) 2 solution, fully stirring and uniformly mixing, drying, and carrying out heat treatment to obtain the nickel-loaded hierarchical porous SAPO-34 catalyst. The method is simple in process and reasonable in design, the catalyst has an excellent hierarchical porous structure and appropriate surface acidity, the reaction activity and selectivity of the catalyst are effectively improved, and the reaction energy efficiency is effectively improved.

This invention discloses a stepwise selective electro-oxidation recovery method and system for iodine and bromine from high-chlorine brine. This invention utilizes I... ‑ ,Br ‑ Cl ‑ The stepwise difference in the initial oxidation potential is achieved by controlling the anolyte potential relative to the reference electrode to be in two functional ranges sequentially: the first anolyte potential is higher than that in the brine. ‑ The initial oxidation potential is lower than that of Br. ‑ The initial oxidation potential is higher than that of Br. ‑ The initial oxidation potential is lower than that of Cl. ‑ The initial oxidation potential of I ‑ and Br ‑ After selective oxidation to halogens in steps within the same electrolysis unit, the halogens are blown out and absorbed separately to obtain iodine / bromine enriched solutions. This invention uses electrical energy to replace chemical oxidants such as chlorine, avoiding the safety risks and impurity introduction of exogenous oxidants, and reducing I... ‑ and Br ‑ The peroxidation side reaction is eliminated, and the main ionic composition of the brine remains basically unchanged after electrolysis. It can be directly connected to subsequent lithium, boron or potassium extraction processes, realizing the clean and efficient recovery of trace halogen resources in salt lake brine.

The present invention discloses a one-stage series hydrocracking method. The method comprises the following steps: (1) mixing feedstock oil with hydrogen and then entering a hydrocracking pretreatment reactor for pre-reaction; (2) the pre-reaction effluent of step (1) enters a hydrocracking reactor for a first hydrocracking reaction; (3) the first hydrocracking reaction effluent in step (2) enters a catalytic reaction distillation tower for a second hydrocracking reaction and rectification to obtain corresponding products. The method can effectively solve the problem of timely separation of reaction products from the reaction zone, improve the yield of the target product, and at the same time improve the hydrocracking reaction efficiency and reduce the energy consumption of the device.

The present invention discloses a catalytic reaction distillation tower, comprising: a catalytic reaction unit, the catalytic reaction unit further comprising: a catalyst bed, which is used to fill a solid catalyst, starting from the second layer, the upper part of the solid catalyst filled in each catalyst bed has an inclined surface; a liquid phase feed subunit, which is arranged above the top first catalyst bed, and the liquid phase feed is guided downward to the first catalyst bed; a gas phase feed subunit, which is arranged between the catalyst bed of the upper layer and the inclined surface of the next layer, and the gas phase feed of each layer enters the catalyst bed upward; a gas phase channel, which is in a relatively isolated state with the gas phase feed subunit, and the gas phase product generated after the gas phase feed and the liquid phase feed react in the catalyst bed directly enters the gas phase channel. The catalytic reaction distillation tower of the present invention also includes a rectification unit, which is arranged on the upper part of the catalytic reaction unit and rectifying the gas phase product generated by the catalytic reaction unit.

The present invention discloses a coal tar hydroprocessing device and method, which includes: a pre-fractionation tower, which fractionates the pre-treated coal tar and obtains light components; a hydrogenation reactor, which receives the pre-fractionated light components as liquid feed, and the liquid feed flows through each catalyst bed layer from top to bottom in sequence; hydrogen enters uniformly from the bottom of each catalyst bed layer from bottom to top; the gas phase product after the hydrogenation reaction is discharged from the top of the reactor through an independent gas phase channel; a fractionation tower, which receives the cold low-pressure oil converted by hydrogenation and fractionates it into a clean fuel oil product. The coal tar hydroprocessing device and method of the present invention can effectively solve the problem of timely separation of the gas phase reaction product of the hydrogenation reactor from the reaction zone.

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.

The embodiment of the invention relates to the field of monocrystalline silicon production, and provides a tail gas treatment device for preparing antimony-doped monocrystalline silicon and a monocrystalline silicon preparation system.The tail gas treatment device comprises an equipment shell, a heater, a reducer and a collector, the equipment shell is provided with a tail gas inlet, and the tail gas inlet is used for being communicated with an exhaust port of a single crystal furnace; antimony-containing tail gas discharged from the single crystal furnace enters the equipment shell; the heater is arranged on the equipment shell and is used for heating antimony-containing tail gas entering the equipment shell; the reducer is arranged in the equipment shell and is used for carrying out reduction reaction with antimony trioxide in the antimony-containing tail gas in the equipment shell to generate an antimony simple substance; the collector is detachably arranged on the equipment shell and used for collecting the antimony simple substance falling from the reducer. According to the tail gas treatment device for preparing the antimony-doped monocrystalline silicon and the preparation system of the monocrystalline silicon provided by the embodiment of the invention, antimony trioxide in the tail gas generated during preparation of the antimony-doped monocrystalline silicon can be prevented from harming a human body.

This invention discloses a hydrocracking method. The hydrocracking method includes the following steps: mixing feedstock oil with hydrogen and then feeding the mixture into a hydrocracking pretreatment reactor for a pre-reaction; the pre-reaction effluent then enters a catalytic reactive distillation column for hydrocracking and distillation to obtain the corresponding product. This method effectively solves the problem of reaction products not being separated from the reaction zone in a timely manner, while simultaneously improving the yield of the target product and reducing the energy consumption of the equipment.

The invention relates to an aerosol multiphase reaction kinetics-oriented paper spray ionization online detection system, which comprises a paper spray ionization assembly, an aerosol reactant and product channel and an online detection device, and is characterized in that the paper spray ionization assembly comprises an adjustable assembly, a clamping assembly and a paper spray substrate; the end, away from a clamping opening, of the clamping assembly is connected with the adjustable assembly, and the clamping opening end of the clamping assembly is connected with the paper spray substrate. The liquid conveying device is connected with the paper spray substrate; the clamping assembly is connected with the power supply; the paper spray substrate and the on-line detection device are on the same straight line, and the distance between the spray end of the paper spray substrate and the sample introduction end of the on-line detection device is D1; the paper spray substrate and the aerosol reactant and product channel are in the same vertical direction, and the distance between the spray end of the paper spray substrate and the outlet end of the aerosol reactant and product channel is D2.

The invention belongs to the technical field of mass spectrum analyzers, and particularly relates to a catalytic reaction on-line monitoring mass spectrum ionization source device, a catalytic reactor is hermetically connected with an ionization source cavity, the top end of the catalytic reactor is provided with a hole and is filled with a catalyst, the bottom end of the catalytic reactor is connected with a reaction gas source and is used for introducing reaction gas, and the ionization source cavity is provided with a gas inlet; the heating device is wound outside the catalytic reactor; the vacuum ultraviolet lamp, the ion repulsion electrode, the curtain electrode and the hole electrode are all placed in the ionization source cavity, the ion repulsion electrode, the curtain electrode and the hole electrode are sequentially arranged in the light emitting direction of the vacuum ultraviolet lamp, and the top of the catalytic reactor is located between the ion repulsion electrode and the curtain electrode and located on light emitted by the vacuum ultraviolet lamp. The mass spectrum interface of the catalytic reactor designed by the invention can avoid secondary reaction of a short-life catalytic reaction intermediate, ensure the efficiency and effectiveness of active intermediate product detection, and successfully realize on-line monitoring of a catalytic reaction complex species system.