56results about How to "Uniform residence time" patented technology

The invention discloses a production method for preparing an m-nitrobenzenesulfonic acid by a tubular sulfonation reactor and relates to the production method of a chemical product. A production device comprises a nitrobenzene storage tank (1), a sulphur trioxide storage tank (2), the tubular sulfonation reactor (3), a kettle sulfonation reactor (4), a material delivery pump (5), a spraying pump (6), a connecting pipeline and accessories (a valve, a flow meter, a thermometer, an anti-explosion film, sight glass and the like). Nitrobenzene and a sulphur trioxide sulfonating agent enter the tubular sulfonation reactor (3) in proportion, the tubular sulfonation reactor (3) and the kettle sulfonation reactor (4) are used in series, or the tubular sulfonation reactor (3) is used independently.The invention is applied to continuous or discontinuous sulfonation reaction, good in mixing and heat transfer effects, high in reaction speed, high in production efficiency and high in operational flexibility. The production device and the production method which are provided by the invention are applied to various sulfonation reaction production processes.

A fluidized-bed reactor for oxidizing carbon black by ozone with stable fluidizing and no coagulation of carbon black particles has a main body with lower carbon black discharging outlet, gas inlet on its bottom, upper carbon black inlet, gas outlet on its top, internal barrier plate with slits, and gas distributing plate under the carbon black discharging outlet.

The invention adopts a catalyst grading technology and installs adequate chemical reaction environment to carry out incompletely saturated hydrogenation in a mild technological condition, which not only mildly hydrogenates the unsaturated compound in dissolvent, but also mildly hydrogenates the saturated compound. The affected compounds of the hydrogenated dissolvent reach even degree of unsaturation on molecular structure, which improves transferable hydrogen content of molecule, accordingly the free hydrogen(-H) released by cycle dissolvent just can meet the need of hydrogen consumption of direct liquefaction of brown coal in a mild technological condition. The invention can simplify the industrial process of lignite liquification and solvent hydrogenation, reduce the device requirement, and save investment and operating cost.

The invention relates to a device for melt spinning of a linear filament bundle with a spinning beam for mounting a longitudinal spinning nozzle group. The spinning nozzle group comprises a nozzle plate on an underside with a number of nozzle drillings and an inlet plate on an upper side with at least one inlet channel, a distribution chamber being arranged between the inlet plate and the nozzle plate, connected to the inlet channel in the inlet plate and the nozzle drillings in the nozzle plate. According to the invention, a residence time for the polymer melt within the nozzle group is kept as constant as possible with a large production range by means of the inlet plate having several residence chambers connected to inlet channels, arranged at a separation from each other in the longitudinal direction of the spinning beam.

An object of the present invention is to provide a method for reducing a chromium-containing material at a high chromium reduction degree. In the method of the present invention, a mixture of a feedstock containing chromium oxide and a carbonaceous reductant is heated and reduced by radiation heating in a moving hearth furnace. The average rate of raising the temperature of the mixture in the reduction is preferably 13.6° C./s or higher in the period from the initiation of the radiation heating of the mixture until the mixture reaches 1,114° C.

The invention relates to a method for continuously producing N-phosphono methyl glycine. The method comprises the following steps of: inputting reaction feed liquor into a reactor under the condition of oxidizing PMIDA into glyphosate to make an activated carbon catalyst suspend in the reaction feed liquor in the reactor; fully contacting the PMIDA with molecular oxygen; continuously oxidizing the PMIDA into the glyphosate under a selected reaction condition; and performing a PMIDA oxidizing reaction. The invention also relates to a device for continuously producing the N-phosphono methyl glycine. The device mainly comprises a power generator, a tubular reactor and a gas-liquid separator. The device is characterized in that: the power generator is connected with the bottom of the tubular reactor through a pipeline; the gas-liquid separator is connected with the top of the tubular reactor; the lower part of the tubular reactor is provided with an oxygen containing gas feed tube orificeand is connected with a gas distributor in the tube; and the power generator is connected with a feed tube of the PMIDA feed liquor and catalyst activated carbon or a feed tube of the mixed liquor ofthe PMIDA feed liquor and catalyst activated carbon through pipelines.

The invention relates to a method for preparing epoxypropane in a microchannel reactor. The method mainly solves the problems of existence of explosive danger, low conversion rate and low selectivity in the prior art. The technical scheme is as follows: by adopting the method for preparing epoxypropane in a microchannel reactor, gas-phase propylene contacts hydrogen peroxide generated by hydrogen and oxygen in-situ compounding in the microchannel reactor to directly generate the epoxypropane under the action of a catalyst; and propylene and oxygen directly react under the action of a catalyst to generate the epoxypropane, the epoxypropane is collected at the lower reach of the microchannels in the liquid-phase form, and the unreacted gas cyclically enters the microchannel reactor inlet or is evacuated after being diluted. The microchannel reactor comprises at least one microchannel, wherein the sectional dimension of each microchannel is 1 micrometer-1 centimeter, and the sectional dimensions of the microchannel in positions of different lengths are identical or different; and the catalyst is positioned in at least one part of the axial length of the microchannel. The technical scheme well solves the problems, and can be used for preparing epoxypropane.

Process for the continuous preparation of hydroxyalkylamides Process for the continuous preparation of hydroxyalkylamides from carboxylic esters and alkanolamines, wherein the reaction of the starting materials is carried out in an extruder or intensive mixer by intensive mixing and brief reaction with supply of heat and simultaneous removal of the alcohol formed and the final product is then isolated.

The invention relates to a method for continuously preparing a polymer and a device thereof. The device is formed by connecting at least one completely mixed reactor and at least one tower reactor in series. The method comprises: lowering the mass content of oxygen dissolved in a vinyl monomer to 1 to 3ppm; filling the vinyl monomer into the completely mixed reactor, wherein the polymerization temperature is 130 to 150 DEG C, an inert solvent of which the mass is 5 percent based on that of the vinyl monomer is added, and the conversion rate of the polymerization is continuously controlled to be 35 to 60 percent; delivering the obtained reaction mixture to the tower reactor, wherein the reaction temperature is 140 to 160 DEG C, and the final conversion rate of the polymerization is controlled to be 55 to 90 percent; and delivering the obtained polymer mixture to a flash evaporation devolatilization kettle to remove volatiles, and granulating in a granulator to form plastic molded products. In the invention, the energy consumption is low, the product performance is high, the product purity is high, the production efficiency is high, and safety and environment protection are realized.

The invention relates to a continuous preparation method for synthesizing isobornyl acetate by esterification of camphene and acetic acid. Using camphene and acetic acid as raw materials, using solid acid as a catalyst, and adding a certain amount of polymerization inhibitor and acetic anhydride, the esterification reaction is carried out under certain process conditions in a catalyst bed filled with suspension, and the target product acetic acid is obtained. Isobornyl. The invention has the advantages of mild reaction conditions, long service life of the catalyst, good product quality, high raw material conversion rate, continuous production and simple operation, and can be widely used in large-scale industrial production of isobornyl acetate.

The invention relates to a synthesis technology and device of iminodiacetate. The technology uses diethanol amine as a main raw material and comprises the following steps: dissolving the diethanol amine, mixing with a caustic soda solution and deionized water evenly to prepare a feed liquid the mass concentration of which is 10-30%, and transferring the feed liquid into a multistage tubular reactor loaded with a solid catalyst through a metering pump to perform catalytic dehydrogenation reaction to obtain iminodiacetate; and treating the gas generated through catalytic dehydrogenation and the tail gas separated from the discharged liquid to recycle hydrogen. The device comprises the multistage tubular reactor which is designed on the basis of a kinetic model of isothermal constant-pressure reaction, wherein the multistage tubular reactor is formed by connecting 2 to 5 tubular reactors in series; each reactor is formed by a plurality of tubes; the same amount of catalyst is evenly filled in each tube; the upper part or lower part of each reactor is provided with a gas-liquid separator which is used for separating the gas generated through the dehydrogenation reaction from the discharged liquid; and the back of the gas-liquid separator is connected with a demister which is connected with a tail gas treatment device used for purification treatment through a regulating valve. The device provided by the invention has the characteristics that the technological operation is simple, the product yield is no less than 98%, the continuous production can be realized, the work efficiency can be increased, and the like.

The invention discloses a ventilation method for accelerating acid production in lactic acid fermentation. The ventilation method comprises the steps of (A) at the early stage of fermentation, introducing sterile air carrying an oxygen supply agent into lactic acid fermentation feed liquid; and (B) at the later stage of fermentation, stopping introducing sterile air carrying the oxygen supply agent into the lactic acid fermentation feed liquid. According to the method, the oxygen content in the fermentation liquid can be effectively increased, and lactic acid bacteria are promoted to consume more glucose more quickly to generate lactic acid.

The invention relates to a multi-layer drop tube type falling film polycondensation reactor. The polycondensation reactor mainly comprises an outer tower and a plurality of tower cores arranged sequentially from top to bottom, wherein each tower core comprises a tower plate and a plurality of falling film drop tubes arranged side by side; each falling film drop tube comprises a hollow pipe and a plurality of drop sleeves fixed on the outer side wall of the hollow pipe; each drop sleeve comprises an upper separation sleeve and a lower separation sleeve. Depending on the action of gravity of materials, a very large gas-liquid phase interface is formed on the falling film drop tubes, and removal of small molecules is facilitated; when fluids pass through each pair of separation sleeves on each falling film drop tube, the fluid in an internal wall surface area and the fluid in a surface area exchange, and a good surface renewal effect is realized to increase the mass transfer rate. The reactor is simple in structure and high in surface renewal rate and has very large gas-liquid interface; the flow is large, and retention time is controllable; reaction energy consumption is low, and externally added power equipment is avoided.

A method for reducing a chromium containing material, comprising: combining the chromium containing material comprising chromium oxide with a carbonaceous reductant to form a chromium containing mixture; delivering the chromium containing mixture to a moving hearth furnace and reducing the chromium containing mixture to form a reduced chromium containing mixture; delivering the reduced chromium containing mixture to a smelting furnace; and separating the reduced chromium containing mixture into chromium metal and slag. The method also comprises agglomerating the chromium containing mixture in a granulator or the like. The chromium containing mixture has an average particle size of less than about 200 mesh (about 75 μm).

The dynamic inorganic material calcining furnace has one furnace body comprising outer casing, heat insulating layer and refractory material. The furnace body has feeding port and fume exhausting port on one side in the upper part, discharge port and burner nozzle on the other side in the lower part, gas distributing plates with fluidized air distributing chamber and stirrer on two sides, material lowering vane wheel device between the gas distributing plates, main fluidized air distributing pipe in the bottom, and fluidized air distributing branches in the luidized air distributing chamber and the main fluidized air distributing pipe. The present invention has the advantages of low cost, high heat efficiency, homogeneous calcined material staying time, homogeneous temperature and stable product quality.

The invention relates to an improved production method of N-phosphonomethyl glycine, in which a carbon catalyst is filled in a multi-stage fixed bed reactor; phosphonomethyl iminodiacetic acid slurry with the concentration in percentage by weight of 2-10% is used as a feed liquid to be mixed and heated firstly, then is sent into the fixed bed reactor after being pumped and metered, and is fully contacted with oxygen-containing gas which is supplied into the fixed bed reactor via a gas distributor so as to carry out catalytic oxidation reaction to continuously oxidize the phosphonomethy liminodiacetic acid into glyphosate; and the multi-stage fixed bed reactor is an isothermal reaction system formed by a plurality of stages of reactors connected in series, the top of each stage of reactor is provided with the feed liquid and the gas distributor, and the temperature of each stage of reactor is provided by heating or cooling media. A reaction pressure of 0-1.5 MPa and a reaction temperature of 30-180 DEG C are maintained in each stage of fixed bed reactor, and gas, liquid and solid in the reactor are fully contacted to carry out oxidizing reaction to obtain glyphosate feed liquid. The invention has the advantages of finding a multi-stage series isothermal reactor mode which has more uniform retention time than the existing fixed bed reactor and avoids excessive oxidation, and provides an application process which can keep ideal yield of glyphosate after being amplified.

The invention provides a device for continuously synthesizing 4-bromo-2-p-chloro-5-trifluoromethyl pyrrole-3-nitrile, which comprises a first circulating pump, a first plate type heat exchanger, a second circulating pump, a second plate type heat exchanger and an oscillating flow spiral baffle reactor which are sequentially communicated, wherein the oscillating flow spiral baffle reactor comprisesa shell with an accommodating space, a raw material inlet and a raw material outlet provided in the shell and a baffle plate erected in the accommodating space; the baffle plate is a baffle board; two ends of the baffle plate are respectively communicated with the raw material inlet and the raw material outlet; the baffle plate cuts the accommodating space into a continuous bending structure. Compared with the related art, the device for continuously synthesizing 4-bromo-2-p-chloro-5-trifluoromethyl pyrrole-3-nitrile has the advantages that the reaction time is short; the reaction process iseasy to control with less by-products and high product yield.

A tower tray with 3-pilot valves features that its float valves or fixed valves are arranged on tower tray in such manner that the central linking line of each valve row is parallel to the inlet dam, the spray direction of the first valve row is parallel to the inlet dam, the spray direction of the second valve row is reverse to that of the first one, the spray direction of the third valve row points to the down-flow tube, and so on. Its advnatages are longer stay time of liquid on tower plate, enhanced mixing and exchange of liquid in vertical direction, and high efficiency and productivity.

The invention relates to a sewage anaerobic biological treatment system, and especially relates to an MASB multi-stage anaerobic sludge bed reactor. The reactor comprises a plurality of anaerobic sludge bed reaction tanks connected in series, and comprises a sewage pump 1, solid-liquid separators, a water inlet pipe, a water discharge pipe, gas discharge pipes, sludge discharge pipes, and connection pipes. Compared with existing sewage anaerobic biological treatment technologies and especially existing anaerobic sludge bed reactor technologies, the technical scheme provided by the invention has the significant advantages of low project investment cost, low operation cost, good treatment effect, short treatment time, no dead corner, no blockage, easy maintenance, and controllable and adjustable treatment scale and effect. Also, system modularization is realized.