77 results about "Absorption column" patented technology

The invention discloses a flat plate membrane internal part for an absorption tower and the absorption tower. The flat plate membrane internal part comprises a plurality of vertically arranged flat plates and a supporting assembly for supporting and fixing the flat plates, a flow channel is formed between adjacent flat plates; the flat sheet membrane internal part comprises the following three structures: (I) the surface of a flat sheet is provided with continuous convex or continuous groove lines; the supporting assembly is an external frame; (2) discontinuous raised lines are arranged on the surface of the flat plate; the supporting assembly is an external frame; and (3) the supporting assembly comprises a plurality of connecting columns, and the adjacent flat plates are supported and fixed through the connecting columns arranged in a staggered mode. A fixed flowing channel in the flat sheet membrane internal part structure limits transverse movement of gas molecules, and uniform gas-liquid countercurrent contact is achieved. Meanwhile, by optimizing surface geometric lines and arrangement modes of the flat plates and the form of the supporting assembly, the gas-liquid contact area is further increased, the gas-liquid contact time is further prolonged, the gas-liquid mass transfer efficiency in the tower is improved, the pressure drop in the tower is reduced, and the energy consumption of the system is reduced.

The utility model discloses an absorption and desorption device with a safety instrument system, and particularly relates to the technical field of chemical engineering principle experiment teaching, which comprises a support frame, a water tank fixedly arranged at the top of the support frame, a water inlet pipe arranged at the top of the water tank in a penetrating manner, and an absorption pump fixedly arranged on one side of the water tank, an absorption mechanism is fixedly arranged on one side of the absorption pump and comprises a first conveying pipe fixedly arranged at the output end of the absorption pump, an absorption tower is arranged at one end of the first conveying pipe in a penetrating mode, a connecting pipe is arranged at the bottom end of the absorption tower in a penetrating mode, and a buffer tank is arranged at one end of the connecting pipe in a penetrating mode; and two liquid level sensors are arranged in the buffer tank in a penetrating manner. The absorption and desorption device effectively avoids the influence of flow velocity mismatching of absorption liquid and desorption liquid on the experiment process, further maintains stable experiment conditions and protects normal operation of equipment, and meanwhile, the whole absorption and desorption device is provided with a safety instrument system, so that the safety of the device is improved.

The utility model discloses a device for preventing slurry from overflowing from an exhaust pipe of an absorption tower, which relates to the field of chemical industry and comprises an extension pipe and a box body, the extension pipe is fixedly communicated with the box body, the extension pipe is positioned at the bottom of the box body, the bottom of the box body is fixedly communicated with the extension pipe through two return pipes, and the upper end of the extension pipe is fixedly connected with a second umbrella cap. A movable plate is slidably arranged in the extension pipe, and a movable rod is fixedly connected to the upper side of the movable plate. The foam removing device has the beneficial effects that the extension pipe is communicated with the exhaust pipe of the absorption tower, foam in the exhaust pipe can sequentially pass through the extension pipe and the through hole to enter the box body, meanwhile, the foam in the extension pipe can upwards push the movable plate, and the movable plate can drive the second foam removing net to upwards move through the movable rod; the second defoaming net can move downwards under the action of gravity, so that the second defoaming net can vertically move in a reciprocating mode, foam in the box body can be punctured through the second defoaming net to achieve active defoaming, and slurry is prevented from overflowing.

The embodiment of the present application provides a composite absorption tower and a carbon dioxide capture system. The composite absorption tower comprises a tower body, a filler support, a cooling assembly, a plurality of filler blocks and a liquid collecting tank. The tower body has a cavity, the tower body is provided with an air inlet and an air outlet, the filler support is arranged in the cavity, and the filler support and the tower body define a reaction chamber; the cooling assembly is arranged in the reaction chamber in a longitudinal and transverse staggered manner and is separated into a plurality of filler sub-chambers with the tower body, the plurality of filler blocks are correspondingly arranged in the filler sub-chambers, and the cooling assembly circulates refrigerant; and the liquid collecting tank is arranged below the reaction chamber to collect absorption liquid. Therefore, the absorption liquid changes from indirect heat exchange to direct contact heat exchange, so that the absorption liquid is kept at a relatively low temperature. Therefore, the composite absorption tower according to the embodiment of the present application has the advantages of reducing energy consumption, improving heat exchange efficiency and reducing equipment investment.

The utility model relates to a blow-down device, a demister and an absorption tower. The blow-down device comprises a flushing pipe; the water inlet main pipe extends into the absorption tower from the outside of the absorption tower and is connected with the water inlet; the pollution discharge assembly is connected with the pollution discharge port and extends out of the absorption tower from the inside of the absorption tower; and the control valve is arranged on the pollution discharge assembly to control a switch of the pollution discharge assembly. The flushing pipe is arranged in the demister of the absorption tower to clean the demister, the pollution discharge assembly is connected with the pollution discharge port and extends out of the absorption tower from the interior of the absorption tower, the water inlet main pipe is connected with the water inlet to provide cleaning water for the flushing pipe, and when the flushing pipe needs to be cleaned, the control valve is opened, and the control valve is closed. Impurities in the flushing pipe are discharged from the sewage draining outlet and the sewage draining assembly through flushing water entering from the water inlet, a new cleaning water inlet does not need to be connected, cleaning can be carried out under the non-stop condition, the flushing pipe is prevented from being blocked, therefore, the demister is prevented from being blocked, and the reliability and economical efficiency of the demister are improved.

The utility model relates to an acid-base absorption tower. The acid-base absorption tower comprises an absorption tower main body, a spraying mechanism, a plurality of flushing mechanisms, a spraying water tank, a medicine mixing water tank and a pipeline assembly. During use, comprehensive circulating spraying of waste gas in the shell is realized through the spraying water tank, the spraying pipe and the spraying nozzles, so that the absorption efficiency of the waste gas is improved, and the treatment cost of the waste gas is reduced; when the pH value of the absorption liquid in the spraying water tank reaches a preset pH value close to neutral, the absorption liquid in the spraying water tank is discharged into the liquid medicine mixing tank, and the absorption liquid close to neutral in the liquid medicine mixing tank is sprayed to the filler assembly and the demisting structure layer by utilizing the pipeline assembly and the plurality of flushing mechanisms, so that the filler assembly and the demisting structure layer are automatically cleaned and maintained; the waste gas treatment efficiency is further improved, and the waste gas treatment cost is further reduced; the absorption liquid meeting the concentration requirement in the liquid medicine mixing tank is automatically added into the spraying water tank through the pipeline assembly, so that the waste gas treatment efficiency is further improved, and the labor cost is effectively reduced.

The invention discloses a slurry backflow prevention drainage device for an absorption tower inlet flue, and relates to the field of slurry backflow prevention of absorption towers, the slurry backflow prevention drainage device comprises an absorption tower main body, one side of the absorption tower main body is fixedly connected with an inlet flue pipe, the absorption tower main body is rotatably connected with a mounting pipe, and the top end of the mounting pipe is fixedly connected with a transmission pipe; according to the slurry backflow prevention drainage device for the absorption tower inlet flue, the cleaning mechanism is driven by the driving mechanism to automatically operate, and slurry at a smoke inlet of the inlet flue pipe can be timely scraped and cleaned by the cleaning plate. In the cleaning process, the transmission column drives the cleaning plate to move in a reciprocating mode under the action of the arc-shaped transmission block and the spring, stretching cleaning is conducted during entering, secondary cleaning is conducted during moving out, and the situation that slurry is accumulated to block the pipeline is avoided. And meanwhile, the cleaning plate can prevent slurry falling from the absorption tower from entering the inlet flue pipe, so that pipeline internal corrosion caused by backward flowing of the slurry is prevented, and the pipeline damage risk is remarkably reduced.

The invention discloses a combined desulfurization device which comprises a raw material gas mixing tank, a raw material gas compressor, a gas buffer tank, an absorption tower I, an absorption tower II, a constant-temperature water bath, an atomization tank, a solution booster pump and a gas liquid separation tank, the input pipe is provided with a first branch pipe connected with the first absorption tower and a second branch pipe connected with the second absorption tower, the first absorption tower is provided with a first output pipe and a second output pipe, the first branch pipe, the second branch pipe, the first output pipe, the second output pipe and the atomization tank are all provided with valves, and the first absorption tower and the second absorption tower are arranged in the constant-temperature water bath. The solution booster pump is connected with the atomization tank through a pipeline; a desulfurizing agent is introduced into the absorption tower I, the absorption tower II and the solution booster pump. The combined desulfurization device has the beneficial effects of multiple desulfurization modes and flexibility in use. The invention further discloses a test evaluation device and a test evaluation method. The test evaluation device and the test evaluation method have the beneficial effects that evaluation is convenient, and the most suitable desulfurization method is quickly selected.

The utility model belongs to the technical field of waste treatment, and discloses a demisting device for an absorption tower, the demisting device comprises a demisting assembly I and a demisting assembly II, the demisting assembly I is coaxially mounted in an air inducing pipeline, a backflow cavity I is positioned between the side wall of a reaction cavity and the inner side wall of the absorption tower, the top end of the backflow cavity I is open, and the air inducing pipeline is communicated with the backflow cavity I; a second backflow cavity is formed between the outer side wall of the air inducing pipeline and the outer cavity wall of the top end of the reaction cavity, the second backflow cavity is communicated with the air inducing pipeline, a hydrophilic semi-permeable membrane is arranged at the communication position, and the side end of the second backflow cavity is communicated with the first backflow cavity; the bottom of the exhaust cavity communicates with an air inlet pipeline, and the lower end of the air inlet pipeline communicates with the air inducing pipeline and the first backflow cavity. The second demisting assembly is installed in the air inlet pipeline, and an exhaust port communicating with the outside is formed in the top of the exhaust cavity. According to the demisting device, the flowing path of liquid is changed, the situation that the liquid and gas are repeatedly mixed to generate mist again can be reduced, secondary demisting is conducted through the second demisting assembly, and the demisting effect is improved.

An absorption tower (100) having an absorbent phase separation function. The absorption tower (100) having an absorbent phase separation function comprises a tower body (1), a liquid collection assembly (2), a first flow stabilization assembly (3), a rich-phase solution outlet (13) and a lean-phase solution outlet (14), wherein the tower body (1) has an absorption cavity (11) and a phase separation cavity (12) which are sequentially arranged from top to bottom; the liquid collection assembly (2) is located at the top of the phase separation cavity (12), and is configured to collect an absorbent falling from the absorption cavity (11) and convey same to the middle of the phase separation cavity (12); the first flow stabilization assembly (3) comprises a first flow stabilization member (31) and a second flow stabilization member (32), the first flow stabilization member (31) and the second flow stabilization member (32) being arranged vertically opposite each other so as to guide the absorbent entering the phase separation cavity (12) to diffuse in a horizontal direction; and the rich-phase solution outlet (13) is configured to pump out a rich-phase solution located in the phase separation cavity (12), and the lean-phase solution outlet (14) is configured to pump out a lean-phase solution in the phase separation cavity (12).

The invention relates to the technical field of absorption tower liquid level meters, in particular to an automatic alarm device for the liquid level of an absorption tower, which comprises a floating mechanism, the floating mechanism comprises a floating plate, and a lifting mechanism is arranged on the floating plate; the liquid level display mechanism comprises a transmission part, and the transmission part can be meshed with the lifting mechanism; the alarm component is arranged on the side wall of the absorption tower, and the transmission component converts the vertical position change of the lifting mechanism to the alarm component to be displayed; through the arrangement of the floating plate, the whole device can move up and down along with the change of the liquid level, through the cooperation of the gear and the rack, the up-down movement of the lifting mechanism is converted into the liquid level alarm display of the liquid level display mechanism, and through the cooperation of the guide column and the driving groove, the device can continuously give an alarm after the liquid level exceeds the alarm range.

This invention relates to a demister and system for preventing surface scaling in absorption towers. The demister includes a main frame, within which a demister assembly is fixedly connected. The demister assembly includes several demister tubes arranged side-by-side, with connecting pipes fixedly connected between adjacent demister tubes. Each demister tube and connecting pipe has a fixedly connected baffle plate arranged axially along its axis, dividing the interior of the demister tube and connecting pipe into a first chamber and a second chamber. The sidewall of the second chamber has several micropores. The sidewall of the main frame has a hot gas inlet, a hot gas outlet, and an anti-clogging liquid inlet, respectively. The hot gas inlet and outlet communicate with the first chamber, while the anti-clogging liquid inlet communicates with the second chamber. During operation, the demister dilutes and removes slurry droplets adhering to the surface of the demister tubes, thereby preventing evaporation and crystallization to form scale, effectively solving the problem of scaling and clogging in traditional demisters.

The utility model discloses an absorption device for volatile substances in waste water, which comprises an absorption tower body, the upper end of the absorption tower body is connected with a gas inlet pipe, and the bottom of the absorption tower body is connected with a main discharge pipe, and is characterized in that the top of the absorption tower body is provided with a spraying device for spraying deodorant; an upper mixing structure and a lower mixing structure which are used for mixing odor and a deodorant and are detachably mounted are sequentially arranged in the absorption tower body from top to bottom, the absorption tower body is fixedly mounted on a support, and the main discharge pipe is obliquely mounted downwards; the absorption device can fully mix and deodorize odor, and is simple in structure, the deodorization efficiency is improved, and the mounting difficulty is reduced.

The utility model discloses a distributor assembly and an absorption tower, and belongs to the technical field of absorption towers. The distributor assembly is used for being arranged in an absorption tower body of the absorption tower and comprises a distributor, a supporting beam and a protection part, the two ends of the supporting beam are used for being connected with the inner wall of the absorption tower body, and at least part of the protection part is located between the supporting beam and the distributor and connected with the supporting beam and the distributor. In the direction from the distributor to the supporting beam, the orthographic projection of the protection piece covers the orthographic projection of the supporting beam, and the protection piece is made of an anti-corrosion material. According to the scheme, the protection part can play a role in shielding the supporting beam so as to prevent the acid slurry from directly dropping onto the supporting beam, and then the protection part can play a role in protecting the supporting beam so as to reduce corrosion of the acid slurry to the supporting beam, so that the service life of the supporting beam is prolonged.

The application provides an absorption tower, which comprises a tower body, a reaction cavity, a flue gas inlet arranged at the lower end of the tower body, and a flue gas outlet arranged at the upper end of the tower body; an absorption part arranged in the reaction cavity; a cleaning part arranged in the reaction cavity, the cleaning part being arranged above the absorption part, the inlet of the cleaning part being communicated with the absorption part to clean the gas; and a separation part arranged in the reaction cavity, the separation part being arranged above the absorption part, the separation part being provided with a first gas inlet, a first gas outlet and a first liquid outlet, the first gas inlet being communicated with the outlet of the cleaning part, the first gas outlet being communicated with the flue gas outlet, and the first liquid outlet being communicated with the outside of the tower body. The technical scheme provided by the application can solve the problem that in the related art, the absorbent is introduced into the carbon dioxide absorption tower, the absorbent is mixed with the flue gas, and part of the absorbent is discharged into the air along with the flue gas to cause air pollution.

The application provides a device and method for automatically controlling production of hydrogen chloride organic solution in a multistage falling film low-temperature absorption method, which comprises a hydrogen chloride cooler, a first falling film absorber, a second falling film absorber, an absorption tower and a tail gas cooler connected in sequence through a gas phase pipeline, a liquid outlet at the bottom of a solvent storage tank is connected to a liquid phase inlet of the absorption tower through a solvent delivery pipe, and a third flow regulating valve, a solvent cooler and a solvent delivery pump are arranged on the solvent delivery pipe. The application overcomes the shortcomings of the conventional process, such as difficulty in controlling absorption temperature, low absorption efficiency, poor uniformity of product concentration, difficulty in controlling impurity content and the like, and can realize continuous and stable production of qualified products meeting the requirements of the pharmaceutical intermediate industry.

The invention discloses a nitric acid absorption tower and an absorption process thereof, and belongs to the technical field of nitric acid production. The nitric acid absorption tower comprises an absorption unit, a washing unit and a recovery unit, a plurality of absorption structures are arranged in an absorption box of the absorption unit in a linear array mode, and the absorption structures are used for spraying and absorbing nitric oxide to form nitric acid; the washing unit is located above the absorption unit, a plurality of gas mixing structures distributed in a linear array mode are arranged in the washing box, and the gas mixing structures are used for mixing air and nitric acid and washing the nitric acid; the recycling unit is arranged between the washing unit and the absorption unit, the washing unit is connected with the recycling unit through an exhaust pipe arranged on the upper portion of the washing unit, and the recycling unit is connected with the absorption box through a gas return pipe and sends recycled gas into the absorption box. By adopting the nitric acid absorption tower and the absorption process thereof, the problems of low nitric oxide conversion rate and low nitric acid concentration of the existing absorption tower can be solved.

The present invention relates to the field of phase separation technology, and specifically to an absorption tower and a carbon dioxide capture system. The absorption tower includes an absorption tower body and a phase separation component. The absorption tower body has a first phase separation outlet and a second phase separation outlet, and the first phase separation outlet and the second phase separation outlet are arranged at intervals in the extension direction of the absorption tower body. The phase separation component includes a collector and a guide pipe. The collector is arranged in the absorption tower body and is sealed to the inner wall surface of the absorption tower body. The cross-sectional area of ​​the collector gradually decreases in the extension direction of the absorption tower body along the direction close to the second phase separation outlet. One end of the guide pipe is connected to the collector to guide the absorbent in the collector. The absorption tower of the embodiment of the present invention can phase the absorbent, reduce the absorbent that needs to be regenerated, and reduce the operating cost.

An absorption column assembly includes an absorption column extending between an upstream end and a downstream end. The absorption column includes a plurality of absorption column modules extends between the upstream and downstream ends of the absorption column. A system includes a stripping structure and an absorption column assembly including an absorption column extending between an upstream end and a downstream end. The absorption column includes a plurality of absorption column modules extending between the upstream and downstream ends of the absorption column. The absorption column assembly is configured to receive lean solvent and flue gas or atmospheric air. Each of the plurality of absorption column modules is configured to cause the lean solvent to absorb a component of the gas or the atmospheric air into the lean solvent to form rich solvent and lean gas.

The invention relates to the technical field of waste gas purification equipment, and discloses an efficient atomization spraying absorption tower which comprises an absorption tower body, a spraying mechanism is fixedly connected to the top of the absorption tower body, a gas inlet mechanism is fixedly connected to the left side of the absorption tower body, and a collecting mechanism is fixedly connected to the bottom end of the absorption tower body; the driving assembly comprises supporting legs, the supporting legs are fixedly connected to the top of the absorption tower body, the top ends of the supporting legs are fixedly connected with a cross, the top end of the cross is fixedly connected with a motor, the bottom end of the motor is fixedly connected with a lead screw, and the surface of the lead screw is in threaded connection with a threaded block. According to the efficient atomizing and spraying absorption tower, a second connecting rod and a first connecting rod can move in a supporting mode under the limiting effect of a sliding seat through a sliding block, then the automatic control effect on spraying of spraying liquid can be achieved, and spraying adjustment is stably supported; and the spraying of the spraying liquid can be fully mixed with the waste gas.

The utility model discloses a circulation structure for a chemical acid-base spraying absorption tower, which comprises a body and a water tank, and the surface of one side of the body close to the top is communicated and connected with an air outlet pipe; the surface of one side, close to the bottom, of the body is in through connection with an air inlet pipe, a collecting box is fixedly mounted in the body, one side of the surface of the bottom of the collecting box is in through connection with a water outlet pipe, the water outlet pipe is in through connection with the body, one side surface of the collecting box is in through connection with a water inlet pipe, and the water inlet pipe is in through connection with a water tank; a hole is formed in the surface of the top of the water inlet pipe, and a filtering assembly is arranged in the hole; through the arrangement of the filtering assembly, impurities contained in the absorption liquid can be filtered under the action of the filtering assembly before the absorption liquid enters the water tank through the conveying pipe, and therefore the time cost consumed when the absorption liquid is filtered subsequently is reduced.

The embodiment of the invention provides a method and device for determining the size of an absorption tower. The method comprises the steps that the reference height-diameter ratio and the treatment gas amount of the absorption tower are preset; determining a standard absorption tower diameter and an equivalent absorption tower diameter of the absorption tower according to the standard height-diameter ratio; determining a reference filler volume according to a filler volume coefficient, a biological coefficient influencing the filler volume and the gas treatment amount, wherein the reference filler volume is the filler volume required for removing hydrogen sulfide in the absorption tower; obtaining an equivalent filler volume according to the reference filler volume, the tower diameter of the equivalent absorption tower and the tower diameter of the reference absorption tower; and determining the actual size of the absorption tower according to the equivalent filler volume. According to the method, the optimal absorption tower size under different height-diameter ratio conditions can be quickly determined, and the design and development precision of the absorption tower is improved.

The application discloses a carbon capture absorption tower and a carbon capture system, and relates to the field of carbon capture technology.The carbon capture absorption tower comprises a tower body and a supporting device, the tower body has a plurality of tower body sections connected in sequence along the axial direction thereof, the supporting device comprises a plurality of supporting frames, the plurality of supporting frames are connected in sequence along the axial direction of the tower body, the supporting frame located at the lowermost side of the supporting device is supported on the ground, and the supporting device is arranged on the outer side of the tower body; the first connecting part between the two adjacent tower body sections and the second connecting part between the two adjacent supporting frames are arranged in a staggered manner in the axial direction of the tower body; at least part of the supporting frames has a first section and a second section arranged along the axial direction of the tower body, the first section is fixedly connected with one of the two adjacent tower body sections, and the second section abuts against the other tower body section. The application can improve the stability and installation efficiency of the overall structure, facilitate the alignment between large components, reduce the construction difficulty, and optimize the load transmission between the adjacent tower body sections.

The utility model discloses an absorption tower slurry PH and density measuring device which comprises an absorption tower, a first drainage pipe and a second drainage pipe which are communicated with the absorption tower are installed at the bottom of the absorption tower, and the first drainage pipe is connected with a first sampling pipe and connected to an inlet in the bottom of a first measuring tank through the first sampling pipe. An outlet in the top of the first measuring tank is connected with a first liquid outlet pipe and connected to a discharge pipe through the first liquid outlet pipe, a first PH meter is inserted into the top of the first measuring tank, the second drainage pipe is connected with a second sampling pipe and connected to an inlet in the bottom of the second measuring tank through the second sampling pipe, and an outlet in the top of the second measuring tank is connected with a second liquid outlet pipe. The second measuring tank is connected to the discharge pipe through a second liquid outlet pipe, and a second PH meter is inserted into the top of the second measuring tank. The slurry in the first measuring tank and the second measuring tank adopts a bottom-in and top-out mode, so that the drained slurry has stability, timeliness and representativeness, and the measurement accuracy of the first PH meter and the second PH meter is guaranteed.

The utility model relates to the technical field of liquid filtering treatment, in particular to an impurity filtering treatment device and a glycol regeneration system, a filtering pipeline is additionally arranged between an absorption tower and a rectifying column, and a filtering mechanism is arranged, so that impurities in rich liquor are removed before the rich liquor enters the regeneration system, and the influence of the impurities in the liquor on the regeneration system is reduced; meanwhile, through the combination of the first filter cup and the second filter cup, liquid is filtered twice in the filter mechanism, the impurity removal effect of the filter mechanism is improved, the filter mechanism is convenient to disassemble and assemble on the filter pipeline, the first filter cup and the second filter cup are convenient to clean and replace, and the service life of the filter mechanism is prolonged. According to the glycol regeneration system, the impurity filtering treatment device is adopted, so that impurities in liquid entering the regeneration system are few, the maintenance frequency and the maintenance cost of the regeneration system can be reduced, and the service life of the regeneration system is prolonged.

The invention relates to the technical field of absorption towers, in particular to a nitric acid absorption tower and a purification method.The nitric acid absorption tower comprises a tower body, a plurality of sieve plates are arranged in the tower body, the tower body is evenly divided into a plurality of absorption layers and a liquid accumulation layer through the sieve plates, the liquid accumulation layer is located below all the absorption layers, and a liquid conveying opening is formed in the surface of the tower body; the liquid conveying opening is communicated with the absorption layer located at the uppermost end, a plurality of first conveying pipes used for being communicated with every two adjacent absorption layers are installed on the surface of the tower body, an opening in the upper end of each first conveying pipe is a liquid inlet, and an opening in the lower end of each first conveying pipe is a liquid outlet; the invention aims to solve the problems that the existing absorption tower cannot crush bubbles in the absorption tower, so that nitrogen dioxide in the bubbles cannot be fully dissolved and reacted, gas discharged from the tower top further contains a large amount of nitrogen oxides, and the nitrogen oxides are not separated completely.

The present disclosure relates generally to processes for scrubbing an off-gas stream of an acetic acid production unit. In one aspect, a process includes introducing the off-gas stream to the absorption column; introducing to the absorption column, a methanol stream at a first flow rate, the methanol stream having a first temperature at the liquid inlet, the first temperature being at least 18° C. (e.g., at least 20° C., or at least 22° C.); in the absorption column, contacting the off-gas stream with the methanol stream; through a liquid outlet of the one or more liquid outlets, withdrawing a first liquid effluent from the absorption column, the first liquid effluent comprising methanol and methyl iodide; and through the vapour outlet, withdrawing a vapour effluent from the absorption column.

1. The name of the design product: absorption tower (L type). 2. The use of the design product: used in non-ferrous smelting electrolysis process to absorb tail gas. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: design 1 perspective view. 5. Design 1 is designated as the basic design.