40results about How to "Reduce the number of plates" patented technology

The invention discloses a system and method for producing hydrogen peroxide through an anthraquinone method. The system comprises the four unit processes of hydrogen dissolving, hydrogenation, oxidation and extraction, wherein a hydrogenation unit comprises a series fixed bed and upflow-type tubular reactors, and working liquid and hydrogen are subjected to a hydrogenation reaction in the hydrogenation unit to obtain hydrogenation liquid; an oxidation unit comprises an oxidation tower, the hydrogenation liquid and oxygen-containing gas are subjected to an automatic oxidation reaction to obtainoxidation liquid; and an extraction unit comprises an extraction tower, hydrogen peroxide in the oxidation liquid is extracted by the water, and thus a high-concentration hydrogen peroxide product isobtained. According to the system and method, the anthraquinone hydrogenation reaction rate can be significantly improved, the anthraquinone hydrogenation reaction efficiency can be significantly improved, the uniformity of the reaction process is maintained, side reactions are less, the obtained hydrogenation liquid is good in quality, small in by-product number and low in viscosity, the gas-liquid mass transfer rate in the oxidation process is increased, the extraction efficiency in the extraction process is improved, the oxidation time is significantly shortened, and the number of actual tower plates of the extraction tower is decreased.

An energy-saving one-step rectisol method belongs to the technical field of gas purification. The method is characterized in that two or three desulfuration segments of an absorption tower employ a sulfur-free semi-lean solution for absorption; intersegment coolers are adopted; the desulfuration segments can remove sulfide and approximately 50-60% of CO2 from virgin gas simultaneously; only one decarbonization segment of the absorption tower is adopted; a lean solution is used at the top of the tower, and the sulfur-free semi-lean solution is added; flash steam is absorbed by a sulfur-containing semi-lean solution in the medium-pressure flash evaporation process; after most of CO2 in the flash steam is absorbed, the solution is delivered to a lower tower of an H2S concentrating tower for gas stripping; a sulfur-free methanol solution gas stripping tower is additionally adopted and divided into one or two segments; solutions at the segments are heated appropriately before entering the tower; and the sulfur-free semi-lean solution is delivered to the absorption tower after the gas stripping. The energy-saving one-step rectisol method has the effects and benefits that the number of plates of the absorption tower is reduced by about 20%, the tower diameter is shortened, the circulation volume of a methanol lean solution is reduced, the regeneration load of a rich solution is also reduced, the energy consumption of a device is saved by about 30%, and the device investment is saved.

The invention relates to the field of separation of ethanol and ethyl acetate, and discloses a method and device for separating ethanol and ethyl acetate, the method comprising: 1) separating materials containing ethanol and ethyl acetate in an ethanol separation tower Distillation and separation, the top of the tower obtains a second distillate, and the bottom of the tower obtains a second residue mainly containing ethanol and water; the second residue is rectified in an ethanol rectification tower, and ethanol is obtained at the top of the tower; 2) The second distillate and water are mixed and contacted in the overhead separator of the ethanol separation tower for extraction and separation to obtain a water phase and an oil phase; 3) the oil phase is rectified in an ethyl acetate rectification tower , the fourth distillate was obtained at the top of the column, and ethyl acetate was obtained at the bottom of the column. The ethanol and ethyl acetate separation method and device provided by the invention can simultaneously obtain high-purity ethanol and ethyl acetate products, meeting the product quality requirements of industrial alcohol and industrial ethyl acetate.

A process for continuously generating methyl acetate by reactive distillation taking ionic liquid as a catalyst is as follows: raw materials are preheated, acetic acid is input from the upper segment of a reactive distillation tower, ionic liquid is input from the central segment of the tower and methanol is input from the lower segment of the tower simultaneously, the central segment of the reactive distillation tower is a reaction zone, the product of methyl acetate is extracted from the top of the tower, the catalyst of ionic liquid is extracted from the bottom of the tower and enters a flash drum for flash evaporation, the liquid extracted from the bottom of the flash drum is the catalyst of ionic liquid which returns to the reactive distillation tower, gas phase evaporated from the flash drum is mixed vapour of water and methanol, which is input to a methanol recovery tower, raw material of methanol is extracted from the top of the methanol recovery tower after being separated, and returns to the reactive distillation tower to be raw material, water is extracted from the bottom of the methanol recovery tower and is discharged. The process of the invention discharges no waste acid water, the material of devices of the required towers is only 316L stainless steel and can reduce the corrosion for the devices and one-time investment remarkably, energy consumption decreases bymore than 15% simultaneously, therefore the production cost of final product reduces by more than 30%.

The invention relates to a stereo mass transfer liquid co-flow tower, which is a gas-liquid contact device used in processes of mass transfer, heat transfer and the like in the fields of chemical engineering, oil refining, petrifaction, pharmacy, environmental protection and the like. The tower comprises a tower body and multilayer continuous mass transfer tower plates; each layer of continuous mass transfer tower plate comprises a tower plate, a stereo mass transfer element and a down-flow system; and the down-flow system of the continuous mass transfer tower plate enables liquid on each layer of tower plate in the tower to flow in the same direction so that a retention area is not left on the tower plate, an effective mass transfer area is enlarged, the treatment capability is increased, the average push force of gas-liquid transfer on the tower plates is improved and the mass transfer efficiency of the tower plates is further improved.

The invention discloses an air separation fractionating tower system and a technology utilizing the air separation fractionating tower system to prepare low-purity oxygen. The pressure air is subject to heat exchange by a main heat exchanger and a liquid oxygen evaporator and is converted into partially liquefied air, then the air is separated into oxygen-rich liquid air and nitrogen in a lower tower of the fractionating tower, and the oxygen-rich liquid air enters an upper tower of the fractionating tower; the nitrogen is cooled into liquid nitrogen in the condensing evaporator, and is sent into the upper tower of the fractionating tower through an overcooler; each material in the upper tower of the fractionating tower is separated into low-purity liquid oxygen and nitrogen, and the low-purity liquid oxygen is subject to heat exchange and gasifying with the nitrogen at the lower part of the lower tower of the fractionating tower in the condensing evaporator, is subject to heat exchange by the condensing evaporator and the main heat exchanger, and is sent out as a product; the low-purity liquid oxygen is also subject to heat exchange by the liquid oxygen evaporator and the main heat exchanger, and is sent out as the product. The air separation fractionating tower system has the advantages that the low-purity oxygen and high-purity oxygen with different purities and pressures can be simultaneously produced, the operation pressure is low, the extraction rate is high, the energy consumption is little, the equipment investment is low, the requirements of low-purity oxygen and high-purity oxygen in multiple industries can be well met, and the air separation fractionating tower system is suitable for industrial production.

The invention relates to an equipment and method for saving energy conservation in selective evaporation. The equipment involves A and B rectification tower in series. The bottom of Tower A connects the reboiler. The export of Tower A connects the import of Tower B. The export of Tower A on the top connects middle reboiler, reflux accumulator, reflux pump. The bottom of Tower B connects middle reboiler. The top of Tower B connects condenser, reflux accumulator, reflux pump. The heat of condensation of Tower A is as the load of middle reboiler when connected Tower B. Part of the heat of condensation reflows to the tower and other is as the product. In Tower B, the light product boils over from the top. Some reflows to tower and other is as the product. The heat is from condenser and middle reboiler and attaches the light-load adjustment reboiler to achieve connecting in series, the mightiness coupling between condenser and middle reboiler. The design is reasonable; the effect on saving energy is obvious.

The invention relates to an internal energy integration non-compression reflux device for ethylene separation. The reflux device comprises an ethylene tower, an ethylene refrigeration compressor, an ethylene refrigeration compressor suction tank, an ethylene refrigerant user, an ethylene refrigerant buffer tank, an ethylene refrigerant condensation cooler, an ethylene overhead condenser, an ethylene tower compressor, an ethylene bottom reboiler and a reducing valve. A specific process flow comprises the following steps: feeding a material from a previous process into the ethylene tower; passing a produced liquid from the tower top of a rectifying section through the ethylene refrigeration compressor and the ethylene refrigerant condensation cooler and then entering into the ethylene refrigerant buffer tank; returning back the produced liquid phase from the tower bottom of the rectifying section to the top of a stripping section through the reducing valve; passing a produced gas phase from the top of the stripping section through the ethylene tower compressor and then entering into the bottom of the rectifying section, and recovering circular ethane from the bottom of the stripping section; successively feeding refrigerants into the ethylene refrigeration compressor suction tank from the buffer tank and providing cold energy for a refrigerant user; and returning back a gas-phase material flows from the tops of various suction tanks for refrigeration and compression. By using the device, the power consumption of the refrigeration compressor can be reduced so as to reduce the total energy consumption of an ethylene device.

The invention relates to a method for synthesizing N-acetylmorpholine. The method comprises the following steps of adding N-acetylmorpholine, an acetic acid entrainer, a dehydrating agent and water into a tower bottom, heating until a residue is boiled, raising vapor, condensing, layering condensate into an oil phase and an aqueous phase, accumulating the aqueous phase in a layering device, refluxing the oil phase from an upper material inlet of a rectifying section, when the tower top temperature reaches 84.6 DEG C, adding morpholine from the upper material inlet of a reaction section, adding acetic acid from the lower material inlet of the reaction section, adding the acetic acid entrainer from the upper material inlet of a dehydrating section, reacting morpholine and acetic acid to produce morpholine salt, dehydrating morpholine salt to produce N-acetyl morpholine and water, azeotroping water and the dehydrating agent, passing through the dehydration section, the reaction section and rectifying section to enter the condenser for condensing, layering the condensate into the oil phase and an aqueous phase, extracting the aqueous phase, refluxing the oil phase and extracting N-acetylmorpholine from the tower bottom. The method for synthesizing N-acetylmorpholine is high in production efficiency, low in energy consumption, small in device investment, short in process and free of pollution and the large-scale continuous production can be achieved.