CN105521622A - Simulated moving bed adsorption tower external pipeline leaching device and application thereof in adsorptive separation - Google Patents
Simulated moving bed adsorption tower external pipeline leaching device and application thereof in adsorptive separation Download PDFInfo
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- CN105521622A CN105521622A CN201410520479.1A CN201410520479A CN105521622A CN 105521622 A CN105521622 A CN 105521622A CN 201410520479 A CN201410520479 A CN 201410520479A CN 105521622 A CN105521622 A CN 105521622A
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Abstract
The invention discloses a simulated moving bed adsorption tower external pipeline leaching device and an application thereof in adsorptive separation. The device comprises a material in/out header pipeline (4); a first branch pipe (5) on one side of the material in/out header pipeline (4); a second branch pipe (6) on the other side of the material in/out header pipeline (4), wherein the first branch pipe (5) and second branch pipe (6) are connected to the material in/out header pipeline (4) through a three-way piece; a raw material F import pipeline (7) and a raffinate R export pipeline (8) communicating with the first branch pipe (5); an extract liquid E export pipeline (9) and a desorbent D import pipeline (10) communicating with the second branch pipe (6); flushing pipelines (11); control valves (12) respectively connected with the material in/out pipelines; and a control component (13) used for controlling the on/off of every control valve (12). In adsorptive separation applications, with the device, the purity can yield of a product in the extract liquid can be improved, and adsorptive separation operation energy consumption can be reduced.
Description
Technical field
The present invention relates to the outer pipeline drip washing equipment of a kind of moving-bed adsorption tower and the application in adsorbing separation thereof.More particularly, relate on a kind of adsorption tower being applied to moving-bed adsorption separation process, press the bed external pipeline input and output material of certain hour exchange-column shift and the equipment of drip washing for multiply input and output material, and the application in adsorbing separation.
Background technology
In petrochemical industry, the fluid carried out in containing the container of solid particle and the process of solid particle contacts are widely used in during such as adsorbing separation, catalytic reaction etc. operate.Wherein adsorbing separation is isolation technics conventional in petrochemical industry, and the purification of the mixture close for structure, boiling-point difference is very little has extraordinary effect.Equipment for adsorbing separation has fixed bed, moving bed and simulation moving-bed, wherein the simulation moving-bed capital equipment being current adsorbing separation and adopting.In simulation moving-bed, Stationary liquid adsorbent can be envisioned for is against moving in material moving direction, certain in the middle part of mask work district of mixed material to be separated is a bit inputted continuously, the ratio of the flow velocity of selected both direction flowing, feed liquid is just divided into two parts of reverse flow from porch, take feed entrance as reference point, adsorbent seems to have adsorbed product and moves up, and is therefore called " simulation moving-bed ".Position more than feed points is higher, and product purity is higher, and byproduct is in the opposite direction enrichment.Simulation moving-bed production capacity and separative efficiency higher than fixed adsorption bed, can avoid again that moving bed adsorption weares and teares, channel between fragment or dust occluding device or pipeline and solid particle seam.
When fluid flows through the simulation moving-bed equipment containing solids bed, in order to reach the effect of the solid particle simulation movement be fixed in bed, a series of material turnover pipeline must be set at each bed.By the turnover switching carrying out different material at each bed of timing, reach the object that solid particle contacts with fluid reverse flow in bed.Meanwhile, because material switches, pollution to a certain degree in pipeline must be caused.Therefore, a kind of rational bed line construction, suitable input and output material order and ELUTION METHOD must be designed, improve product purity and the yield of moving-bed adsorption separation process.
US5478475 discloses the rotary bed external pipeline of a kind of multichannel and has passed in and out control device.This device is divided into upper and lower two parts, and top is divided into conduit valve, connects charging, strippant, Extract, raffinate and some strands of flushing liquor storage tanks respectively; Bottom is divided into rotary valve, is connected respectively with each bed.Rotated by synchronization timing, the material in conduit valve can be communicated with the bed of specifying by this device, is imported by different materials or extracts different beds out, realizing the simulation continuous moving of solid particle in bed in whole adsorption tower.This multichannel slewing is simple to operate, has good synchronism, but complex structure, easily leak, and be not easy to be applied in fairly large device.
CN1714915A discloses a kind of multichannel rotary valve similar with US5478475, difference is conduit valve except except charging, strippant, Extract are communicated with raffinate storage tank, also be connected with a circulation rinsing liquid pipeline, realize the drip washing of pipeline, and independent flushing liquor pipeline is no longer set.
CN1174750A discloses simulation moving-bed drip washing equipment, and this equipment comprises at least one drip washing valve in every bar distribution circuit of each bed, and this group drip washing valve is connected with at least one circulation line moving fluid.The distribution pipeline of each bed also comprises one group of material distribution pipeline, comprises respectively: raw material, strippant, Extract and raffinate.All distribution pipelines are all equipped with a control valve, and are connected in the unlatching of these valves or closing control component.The structure of this drip washing equipment is simple, can be applied in the equipment of different scales, but controls more complicated, and the drip washing pipeline of circulation can cause extra energy consumption.
In sum, the bed external pipeline used at present and drip washing equipment also exist following problem to be needed to improve:
(1) complicated structure;
(2) contact probability of material in pipeline mutually polluted can not be effectively reduced;
(3), after material switches, the pollution in pipeline is rinsed insufficient;
(4) cycling elution mode causes extra energy consumption.
Therefore, need to provide one to overcome the problems referred to above, improve the outer pipeline drip washing equipment of moving-bed adsorption tower and the method for product purity and yield.
Summary of the invention
The object of the invention is to overcome the problems referred to above, improve product purity and yield, provide the outer pipeline drip washing equipment of a kind of moving-bed adsorption tower and the application in adsorbing separation thereof.
To achieve these goals, the invention provides the outer pipeline drip washing equipment of a kind of moving-bed adsorption tower, this equipment comprises: the total input and output material pipeline 4 stretched out outside adsorption tower 1 be connected with the fluid distributor 3 on the solids bed 2 in each adsorption tower 1; Be positioned at the first arm 5 being connected to total input and output material pipeline 4 side outside adsorption tower 1; The second arm 6, first arm 5 being connected to total input and output material pipeline 4 opposite side be positioned at outside adsorption tower 1 is connected with total input and output material pipeline 4 by a threeway with the second arm 6; The raw material F be communicated with the first arm 5 imports pipeline 7; The raffinate R be communicated with the first arm 5 derives pipeline 8; The Extract E be communicated with the second arm 6 derives pipeline 9; The strippant D be communicated with the second arm 6 imports pipeline 10; The clean-up line 11 be all communicated with the second arm 6 with the first arm 5, clean-up line 11 has one at least; The control valve 12 be connected respectively with each input and output material pipeline; Control the control member 13 that each control valve 12 is opened or closed.
Present invention also offers the application of equipment provided by the invention in adsorbing separation.
Compared with prior art, the outer pipeline drip washing equipment tool of moving-bed adsorption tower provided by the invention has the following advantages:
Structure is simple, easily realizes; Be placed on different arms by the material pipeline polluted mutually, such as raw material F and Extract E, the material do not polluted mutually is placed on same arm, such as strippant D and Extract E, reduces material and switches the pipeline pollution level caused; Unified control system controls sequencing valve corresponding to all bed pipelines, is convenient to control.
Above advantage can improve purity and the ultimate yield of product in Extract E effectively, reduces the energy consumption of whole adsorbing separation operation.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for description, is used from explanation the present invention, but is not construed as limiting the invention with detailed description of the invention one below.In the accompanying drawings:
Fig. 1 is the schematic diagram of the outer pipeline drip washing equipment of moving-bed adsorption tower provided by the invention;
Fig. 2 is a kind of embodiment of the outer pipeline drip washing equipment of moving-bed adsorption tower provided by the invention;
Fig. 3 is the another kind of embodiment of the outer pipeline drip washing equipment of moving-bed adsorption tower provided by the invention.
Description of reference numerals
1, adsorption tower 2, solids bed 3, fluid distributor
4, total input and output material pipeline 5, first arm 6, second arm
7, raw material F imports pipeline 8, raffinate R derives pipeline 9, Extract E derives pipeline
10, strippant D imports pipeline 11, clean-up line 12, control valve
13, control member 14, flushing liquor C1 importing pipeline 15, flushing liquor C2 import pipeline
16, flushing liquor C3 importing pipeline 17, flushing liquor C4 import pipeline 18, check-valves
19, the 3rd arm 20, the 4th arm
Detailed description of the invention
Below the specific embodiment of the present invention is described in detail.Should be understood that, detailed description of the invention described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
The outer pipeline drip washing equipment of moving-bed adsorption tower provided by the invention, can be used for the process of any fluid and solid particle contacts, can be used alone in the container of fluid and solid particle contacts one group of this equipment, also can use many this equipment of group simultaneously.Fluid flows through each solids bed separated downwards along main shaft in container.The material forming solids bed comprises adsorbent, resin, catalyst and inert material, but is not therefore restricted.The fluid flowing through solids bed can be steam, liquid or supercritical fluid, and fluid can be pure material, also can be the mixture of multiple compounds or multiple fluid, as long as these mixtures must be a phase substantially.The process that many this fluids contact with solids is had, such as various reaction and separation process in petroleum chemical industry.Equipment preferential recommendation provided by the invention is used in moving-bed adsorption separation process.
The outer pipeline drip washing equipment of moving-bed adsorption tower provided by the invention can be installed on the outside of the such as simulation moving-bed this kind of container containing solids bed, make it to be connected with the fluid distributor in container, in different solids beds, importing and the extraction of different material is carried out by some cycles, and the pollution in the pipeline that importing and the extraction of material are caused, carry out drip washing removing, improve product purity and the ultimate yield of whole process.
The outer pipeline drip washing equipment of moving-bed adsorption tower provided by the invention, in different moving-bed adsorption separation processes, have different structures, the material number of lines of its correspondence and backwashing manner are also diversified.
The invention provides the outer pipeline drip washing equipment of a kind of moving-bed adsorption tower, this equipment comprises: the total input and output material pipeline 4 stretched out outside adsorption tower 1 be connected with the fluid distributor 3 on the solids bed 2 in each adsorption tower 1; Be positioned at the first arm 5 being connected to total input and output material pipeline 4 side outside adsorption tower 1; Be positioned at the second arm 6 being connected to total input and output material pipeline 4 opposite side outside adsorption tower 1; First arm 5 is connected with total input and output material pipeline 4 by a threeway with the second arm 6; The raw material F be communicated with the first arm 5 imports pipeline 7; The raffinate R be communicated with the first arm 5 derives pipeline 8; The Extract E be communicated with the second arm 6 derives pipeline 9; The strippant D be communicated with the second arm 6 imports pipeline 10; The clean-up line 11 be all communicated with the second arm 6 with the first arm 5, clean-up line 11 has one at least; The control valve 12 be connected respectively with each input and output material pipeline; Control the control member 13 that each control valve 12 is opened or closed.
According to the present invention, under preferable case, the diameter of the first arm 5 can be identical with the diameter of total input and output material pipeline 4, or be less than the diameter of total input and output material pipeline 4.
According to the present invention, under preferable case, the diameter of the second arm 6 can be identical with the diameter of total input and output material pipeline 4, or be less than the diameter of total input and output material pipeline 4.
According to the present invention, under preferable case, first arm 5 can arrange butterfly valve or porous plate with the junction of total input and output material pipeline 4 and the junction of the second arm 6 and total input and output material pipeline 4, prevents material from flowing into the second arm 6 from the first arm 5 or flowing into the first arm 5 from the second arm 6.
According to the present invention, under preferable case, clean-up line 11 can arrange multiply.
According to the present invention, under preferable case, flushing liquor can be imported the effect that total input and output material pipeline 4 reaches clean-up line by clean-up line 11, or also the fluid in adsorption tower 1 can be derived by total input and output material pipeline 4 effect that clean-up line 11 reaches clean-up line.
According to the present invention, under preferable case, the composition of the flushing liquor in multiply clean-up line 11 can be identical or different.
According to the present invention, under preferable case, control valve 12 is generally sequencing valve.
According to the present invention, control member 13 controls unlatching or the closedown of the input and output material pipeline corresponding to all solids particle bed 2 in adsorption tower 1, and under preferable case, control member 13 is can by controlling the control system of the switch of the control valve 12 on every root lateral line canal.Preferably, control member 13 makes in each stepping time, ensure that in adsorption tower 1, the maximum lateral line canal different from of each solids bed 2 is communicated with, and ensures that raw material F, strippant D, raffinate R, Extract E are communicated with the fluid distributor of in adsorption tower 13 with flushing liquor.In the present invention, described input and output material pipeline comprises raw material F and imports pipeline 7, raffinate R derivation pipeline 8, Extract E derivation pipeline 9, strippant D importing pipeline 10 and clean-up line 11.
According to the present invention, can have multiple stacked fluid distributor 3 in adsorption tower 1, each fluid distributor 3 can be communicated with the outer pipeline drip washing equipment of at least one moving-bed adsorption tower provided by the invention.Under preferable case, fluid distributor 3 is multiple, and each fluid distributor 3 connects separately the outer pipeline drip washing equipment of a described adsorption tower separately.
Description the present invention detailed below in conjunction with accompanying drawing and concrete embodiment.But the present invention is not limited in this several embodiment mentioned.Accompanying drawing is all the schematic diagram of simplification and draws not in scale.
Fig. 1 is the schematic diagram of the outer pipeline drip washing equipment of moving-bed adsorption tower provided by the invention, in the simulation moving-bed adsorption tower 1 of Fig. 1 display, along the vertical stacked multiple solids bed 2 of major axes orientation, fluid distributor 3 is set between two solids beds 2.Fluid distributor 3 extracts the fluid in adsorption tower 1 out adsorption tower 1 by total input and output material pipeline 4, or the fluid outside adsorption tower 1 is imported adsorption tower 1.Total input and output material pipeline 4 stretch out after adsorption tower 1 with two arms, namely the first arm 5 is connected by a threeway with the second arm 6, and the first arm 5 and the second arm 6 are placed in the both sides of total input and output material pipeline 4.In order to reduce Flow of Goods and Materials in a side branch to the pollution of opposite side arm, butterfly valve can be set in the junction of above-mentioned arm and total input and output material pipeline 4 or inner member worked as by porous plate.First arm 5 is connected different material pipelines respectively with on the second arm 6, and the principle of setting is: the material polluted mutually, as raw material F and Extract E, is connected on the arm of not homonymy; The material do not polluted mutually, as strippant D and Extract E, is connected on the arm of the same side; Clean-up line 11 is placed in the top of two side branch, makes flushing liquor can flow through whole bed external pipeline.According to this principle, along the direction away from itself and total input and output material pipeline 4 junction on the first arm 5, arranging successively, raffinate R derives pipeline 8, raw material F imports pipeline 7 and clean-up line 11.Can by the material adsorbed because substantially do not contain in raffinate R, be arranged on the position near total input and output material pipeline 4, when can shorten extraction raffinate R, the flow path of fluid in whole bed external pipeline, reduce its contaminant capacity to pipeline, save the consumption of flushing liquor.Along the direction away from itself and total input and output material pipeline 4 junction on second arm 6, arranging successively, Extract E derives pipeline 9, strippant D imports pipeline 10 and clean-up line 11.Because comprise final products in Extract E, therefore the position near total feed and exhaust tube 4 is arranged on, when can shorten Extract E, the flow path of fluid in whole bed external pipeline, reduce product in Extract E and, by the chance of other Substances Pollution in whole bed external pipeline, improve purity and the yield of product.Meanwhile, strippant D is imported pipeline 10 and be placed in relatively away from the position of the second arm 6 with total input and output material pipeline 4 junction, when importing parsing agent, strippant can flow through the most of pipeline in whole bed external pipeline, reaches certain developing result.Clean-up line 11 is placed in the two ends of two arms, as far as possible away from the position of total input and output material pipeline 4, makes flushing liquor fully can cover whole bed external pipeline, reaches best developing result.Clean-up line 11 has one at least, according to circumstances multiply can be set, clean-up line 11 can be flushing liquor is imported the effect that total input and output material pipeline 4 reaches clean-up line, also can be that the fluid in adsorption tower 1 is derived by total input and output material pipeline 4 effect that clean-up line 11 reaches clean-up line.The composition of the flushing liquor in the clean-up line 11 of two side branch ends can be identical or different.Flushing liquor in clean-up line 11 can be communicated with the second arm 6 with the first arm 5 simultaneously rinses; Also first can be communicated with the first arm 5 and rinse, and then be switched to be communicated with the second arm 6 and rinse.The composition of flushing liquor should be identical or close with the composition being about to the fluid entering or derive this bed.
As shown in Figure 1, the every root input and output material pipeline be communicated with total input and output material pipeline 4 that each fluid distributor 3 stretches out all is connected with a control valve 12, and control valve 12 connects corresponding material storage tank (not shown).All control valves 12 all carry out the control of opening or closing by same control member 13.Control member 13 control each fluid distributor 3 in adsorption tower 1 distinguish unlatching or the closedown of corresponding input and output material pipeline, ensure that each fluid distributor 3 in every stepping time in corresponding adsorption tower 1 only has at most one to be communicated with total input and output material pipeline 4, and ensure that raw material F, strippant D, raffinate R, Extract E are communicated with the fluid distributor of in adsorption tower 13 with flushing liquor.
Present invention also offers the application of equipment provided by the invention in adsorbing separation.
The method of operating of the outer pipeline drip washing equipment of moving-bed adsorption tower provided by the invention is: be filled with solid particle, such as adsorbent, simulation moving-bed adsorption tower 1 in, place multiple solids bed 2 separated by fluid distributor 3.A large amount of fluids flows from top to bottom along adsorption tower 1.Move up to realize solid particle simulation, with the counter current contacting of fluid, all beds are divided into 4 operating spaces, i.e. adsorption zone, desorption district, refining district and buffering area, each district is made up of some solids beds 2, and the bed forming these districts does not stop change in time.According to the situation of the input and output material pipeline that each bed connects, the process that whole moving-bed adsorption is separated is divided into 5 operating procedures, namely imports raw material F, importing or derive flushing liquor clean-up line, derivation Extract E, derivation raffinate R and import strippant D.The operating time of each step, be stepping time, conveniently a programme-control, the stepping time of each operation should be consistent.
Concrete operations are: in a certain stepping time, and a certain solids bed 2 being in adsorption zone (is A
1bed) total input and output material pipeline 4 that the fluid distributor 3 of top connects imports pipeline 7 by the raw material F on the first arm 5, under the effect of control valve 12, starts raw material F to import adsorption tower 1.After raw material F enters adsorption tower 1, under the mixed allocation effect of fluid distributor 3, enter A
1bed, A
1bed enters adsorption zone, and the adsorbable material in raw material F is by adsorbent, and all the other fluids continue the bed (for B bed) flowing to below.After this stepping time terminates, control member 13 sends instruction, control valve 12 synchronization action, A
1raw material F in the input and output material pipeline that bed is corresponding imports pipeline and closes; The a certain bed entering adsorption zone simultaneously below this bed (is A
2bed) input and output material pipeline in corresponding raw material F import pipeline and open, start to carry out adsorption operations.
After some stepping times, A
1bed carries out step-by-step operation next time, and control member 13 sends instruction, and control valve 12 synchronization action, clean-up line 11 is opened, to A
1the input and output material pipeline that bed is corresponding rinses, and remains in the component of the raw material F in pipeline when entering to operate by previous step, inwardly pours adsorption tower 1 or outwards goes out outside equipment.After flushing operation terminates, this step-by-step operation terminates, and control member 13 sends instruction, control valve 12 synchronization action, A
1clean-up line 11 in the input and output material pipeline that bed is corresponding is closed.A simultaneously
1a certain bed below bed (is A
3bed) clean-up line 11 in corresponding input and output material pipeline opens, starts to carry out flushing operation.
After some stepping times, A
1bed carries out step-by-step operation next time, control member 13 sends instruction, control valve 12 synchronization action, Extract E derives pipeline 9 and opens, one that is collected by fluid distributor 3 part being in the fluid in the bed (for G bed) in refining district derives adsorption tower 1, enters after being separated and becomes product.After this stepping time terminates, control member 13 command & control valve 12 synchronization action, A
1extract E in the input and output material pipeline that bed is corresponding derives pipeline 9 and closes.A simultaneously
1a certain bed below bed (is A
4bed) Extract E in corresponding input and output material pipeline derives pipeline and opens, start Extract E to extract out.
After some stepping times, A
1bed carries out step-by-step operation next time, and control member 13 sends instruction, control valve 12 synchronization action, and strippant D imports pipeline 10 and opens, and after strippant D enters adsorption tower 1, under the mixed allocation effect of fluid distributor 3, enters A
1bed is by after absorption substance dissolves on the sorbent, and flow to next B bed, B bed enters desorption district.After this stepping time terminates, control member 13 command & control valve 12 synchronization action, strippant D imports pipeline 10 and closes.A simultaneously
1a certain bed below bed (is A
5bed) strippant D in corresponding turnover stockline imports pipeline and opens, start to import strippant, A
5bed enters desorption district.
After some stepping times, A
1bed carries out step-by-step operation next time, control member 13 sends instruction, control valve 12 synchronization action, raffinate R derives pipeline 8 and opens, and the upper part being in the fluid in the bed (for H bed) of buffering area of being collected by fluid distributor 3 derives adsorption tower 1.After this stepping time terminates, control member 13 command & control valve 12 synchronization action, A
1the raffinate R of the input and output material pipeline that bed is corresponding derives pipeline and closes.
After 5 step-by-step operations of one-period terminate, under the control of control member 13, under the effect of control valve 12, to start from importing raw material F the operation in new cycle.Between each step-by-step operation of solids bed 2, the stepping time at institute interval depends on the Region dividing of whole moving-bed adsorption knockout tower, depends on adsorption zone, desorption district, refining district and each self-corresponding bed number of buffering area specifically.
Below by embodiment, further illustrate the outer bed line construction of the moving-bed adsorption tower that the present invention relates to and drip washing equipment and method of operating
Embodiment 1
Fig. 2 is a kind of embodiment of the outer pipeline drip washing equipment of moving-bed adsorption tower provided by the invention, but is not limited to this mode.
Fig. 2 illustrated embodiment is the outer a kind of embodiment of pipeline drip washing equipment in the separation process of carbon 8 aromatics absorption of moving-bed adsorption tower provided by the invention.
As shown in Figure 2, the outer pipeline drip washing equipment of the adsorption tower of the present embodiment comprises: total feed and exhaust tube 4, first arm 5, second arm 6, a raw material F suction pipeline 7, raffinate R derives pipeline 8, flushing liquor C3 imports pipeline 16, flushing liquor C4 imports pipeline 17, Extract E derives pipeline 9, resolve that agent D imports pipeline 10, flushing liquor C1 imports pipeline 14 and flushing liquor C2 imports pipeline 15.Total feed and exhaust tube 4 is connected by a threeway with the first arm 5 and the second arm 6.
The outer pipeline of adsorption tower of solids bed 2 correspondence comprises 8 strands of input and output material pipelines, and its Raw F suction pipeline 7, raffinate R derive pipeline 8, flushing liquor C3 imports pipeline 16 and is communicated with the first arm 5 with flushing liquor C4 importing pipeline 17; Extract E derives pipeline 9, parsing agent D imports pipeline 10, flushing liquor C1 imports pipeline 14 and is communicated with the second arm 6 with flushing liquor C2 importing pipeline 15.Raffinate R derives pipeline 8 and Extract E derives pipeline 9 from total feed and exhaust tube 4 recently, and raw material F imports pipeline 7 and strippant D imports pipeline 10 from total feed and exhaust tube 4 farthest, lays respectively at the two ends of arm 5 and arm 6.Flushing liquor C1 imports pipeline 14 and flushing liquor C2 imports pipeline 15 between arm 6 strippant D importing pipeline 10 and Extract E derivation pipeline 9, and flushing liquor C1 importing pipeline 14 imports pipeline 10 closer to strippant D.Flushing liquor C3 imports pipeline 16 and flushing liquor C4 imports pipeline 17 between arm 5 raw material F importing pipeline 7 and raffinate R derivation pipeline 8, and flushing liquor C3 importing pipeline 16 imports pipeline 7 closer to raw material F.
For the separation process of carbon 8 aromatics absorption, raw material F is the mixture comprising carbon 8 isomers, carbon 10 aromatic hydrocarbons and non-aromatic component; Strippant D is carbon 10 aromatic hydrocarbons; Extract E is strippant D and the mixture of carbon 8 aromatic hydrocarbons that will purify; Raffinate R is other carbon 10 aromatic hydrocarbons in strippant D, raw material, non-aromatic and not by the mixture of adsorbent carbon 8 arene isomer composition; The composition of flushing liquor C1 is identical with the composition of strippant D; The composition of flushing liquor C2 with C3 is identical with the composition of Extract E or close; The composition of flushing liquor C4 is identical with raw material F or close.
Whole adsorption tower 1 comprises altogether 24 solids beds, comprises 8 strands of input and output material pipelines in each bed, and every root input and output material pipeline is connected with a control valve 12, and one has 192 control valves 12.Whole control valve 12 all controls it by control member 13 and opens or close.
The course of work of this embodiment is: before raw material F imports pipeline 7 unlatching, first open flushing liquor C4 and import pipeline 17, carry out the flushing of pipeline, flushing liquor C4 is set, raffinate R residual in pipeline can be reduced to the dilution of the material will purified in raw material F, increase adsorbent in bed and, to the adsorbance of carbon 8 aromatic hydrocarbons adsorbable in raw material, improve the yield of product;
Next step-by-step operation, control member 13 controls control valve 12, and flushing liquor C4 imports pipeline 17 and closes, and raw material F imports pipeline 7 and opens, and raw material F enters adsorption tower;
Next step-by-step operation, raw material F imports pipeline 7 and closes, and flushing liquor C3 imports pipeline 16 and opens, before Extract E, by the component of raw material F remaining in the pipeline of the first arm 5, can rinse well, avoid it to bring in product with Extract E, affect the purity of product;
Next step-by-step operation, flushing liquor C3 imports pipeline 16 and closes, and flushing liquor C2 imports pipeline 15 and opens, before Extract E is extracted out, by the component of raw material F remaining in the pipeline of the second arm 6, can rinse well, avoid it to bring in product with Extract E, affect the purity of product;
Next step-by-step operation, flushing liquor C2 imports pipeline 15 and closes, and Extract E derives pipeline 9 and opens, and derives Extract E, obtains product after being finally separated;
Next step-by-step operation, Extract E derives pipeline 9 and closes, flushing liquor C1 clean-up line 14 is opened, before importing strippant D, the component of the Extract E remained in bed external pipeline is removed, otherwise these components can enter adsorption bed with strippant D, compete with absorption material on the sorbent and be dissolved in strippant D, the consumption adding strippant is separated the energy consumption of strippant with subsequent operation;
Next step-by-step operation, flushing liquor C1 imports pipeline 14 and closes, and strippant D imports pipeline 10 and opens, and imports strippant D, by the substance dissolves that is adsorbed on particle layers in strippant D;
Next step-by-step operation, strippant D imports pipeline 10 and closes, and raffinate R derives pipeline 8 and opens, and is extracted out by the raffinate R in bed, and after being separated, the strippant D obtained is recycled.
Then, the step-by-step operation carrying out next cycle is started.The stepping time at each step-by-step operation institute interval of each bed, Region dividing according to whole absorptive separation column is determined, a kind of possible aromatics absorption knockout tower Region dividing mode is, adsorption zone 7 beds, 9, desorption district bed, refining 5, district bed, buffering area 3 beds, but be not limited to this Region dividing mode.
As required, the importing of flushing liquor C2 and flushing liquor C3 can divide two step-by-step operations to carry out as mentioned above, also in same step-by-step operation, can carry out simultaneously.Flushing liquor C2 imports the fluid flow direction in pipeline 15 and flushing liquor C3 pipeline 16, and can flow in the export-oriented container of container as mentioned above, also can be outflow to container in container.
In Extract E, the energy consumption of the purity of product, ultimate yield and adsorbing separation operation the results are shown in Table 1.
Embodiment 2
Fig. 3 is the another kind of embodiment of the outer pipeline drip washing equipment of moving-bed adsorption tower provided by the invention, but is not limited to this mode.
Fig. 3 illustrated embodiment is the outer a kind of embodiment of pipeline drip washing equipment in naphtha hydrocarbon adsorption separation process of moving-bed adsorption tower provided by the invention.
As shown in Figure 3, the outer pipeline drip washing equipment of the adsorption tower of the present embodiment comprises: total feed and exhaust tube 4, first arm 5, second arm 6, raw material F suction pipeline 7, raffinate R derivation pipeline 8, Extract E derivation pipeline 9, parsing agent D importing pipeline 10, a flushing liquor C1 import pipeline 14, flushing liquor C2 importing pipeline 15, the 3rd arm 19 of flushing liquor C2 importing pipeline 15 and the 4th arm 20 of flushing liquor C2 importing pipeline 15.Total input and output material pipeline 4 is connected by a threeway with the first arm 5 and the second arm 6.
The outer pipeline of adsorption tower of solids bed 2 correspondence comprises 6 strands of input and output material pipelines, and its Raw F suction pipeline 7, raffinate R derive pipeline 8 and be communicated with the first arm 5 with the 3rd arm 19 that flushing liquor C2 imports pipeline 15; Extract E derives pipeline 9, parsing agent D imports pipeline 10, flushing liquor C1 imports pipeline 14 and is communicated with the second arm 6 with the 4th arm 20 that flushing liquor C2 imports pipeline 15.Raffinate R derives pipeline 8 and Extract E derivation pipeline 9 is nearest from total input and output material pipeline 4, raw material F imports pipeline 7 and is positioned at and the first arm 5 derives pipeline 8 with raffinate R is close to, and strippant D importing pipeline 10 is positioned on the second arm 6 derives pipeline 9 neighbour with Extract E.Flushing liquor C1 imports pipeline 14 and is positioned at and the second arm 6 arm imports pipeline 10 with strippant D is close to.Flushing liquor C2 importing pipeline 15 is divided into the 3rd arm 19 and the 4th arm the 20, three arm 19 is connected with the first arm 5, and the 4th arm 20 is connected with the second arm 6, and the 3rd arm 19 and the 4th arm 20 lay respectively at the two ends of the first arm 5 and the second arm 6.
For naphtha adsorption separation process, raw material F is the naphtha mixture comprising the n-alkane of carbon 6-carbon 12, isoparaffin, cycloalkane and aromatic hydrocarbons; Strippant D is the n-alkane of carbon 12; Extract E is the mixture of the n-alkane of strippant D and carbon 6-carbon 12; Raffinate R is the mixture of the isoparaffin of carbon 6-carbon 12 in strippant D, raw material, cycloalkane and aromatic hydrocarbons composition; The composition of flushing liquor C1 is identical with the composition of strippant D; The composition of flushing liquor C2 is identical with the composition of Extract E or close.
Whole adsorption tower 1 comprises altogether 12 solids beds, and each bed comprises 6 strands of input and output material pipelines, and every root input and output material pipeline is connected with a control valve 12, and one has 72 control valves 12.Be divided into the 3rd arm the 19 and the 4 20 because flushing liquor C2 imports pipeline 15, be communicated with the second arm 6 with the first arm 5 respectively, the 3rd arm 19 and the 4th arm 20 arrange a check-valves 18 separately.Whole control valve 12 and check-valves 18 all control it by control member 13 and open or close.
The course of work of this embodiment is: raw material F imports pipeline 7 and opens, and raw material F enters adsorption tower, starts by adsorbent;
Next step-by-step operation, raw material F imports pipeline 7 and closes, flushing liquor C2 imports pipeline 15 and opens, flushing liquor C2 enters input and output material pipeline by the 3rd arm 19 and the 4th arm 20, and the check-valves 18 that the 3rd arm 19 and the 4th arm 20 are arranged is opened, can before Extract E, by the component of raw material F remaining in the first arm 5 and the second arm 6 pipeline, rinse well, avoid it to bring in follow-up cracking process with Extract E, affect purity and the yield of olefin product;
Next step-by-step operation, flushing liquor C2 imports pipeline 15 and closes, and Extract E derives pipeline 9 and opens, and derives the Extract E being rich in n-alkane, goes to produce alkene after being finally separated as cracking stock;
Next step-by-step operation, Extract E derives pipeline 9 and closes, flushing liquor C1 clean-up line 14 is opened, before importing strippant D, the component of the Extract E remained in input and output material pipeline is removed, otherwise these components can enter adsorption bed with strippant D, compete with absorption material on the sorbent and be dissolved in strippant D, the consumption adding strippant is separated the energy consumption of strippant with subsequent operation;
Next step-by-step operation, flushing liquor C1 imports pipeline 14 and closes, and strippant D imports pipeline 10 and opens, and imports strippant D, is dissolved in by the n-alkane be adsorbed on particle layers in strippant D;
Next step-by-step operation, strippant D imports pipeline 10 and closes, raffinate is derived pipeline 8 and is opened, the raffinate R being rich in isoparaffin, cycloalkane and aromatic hydrocarbons in bed is extracted out, after being separated, the strippant D obtained is recycled, and the mixture being rich in isoparaffin, cycloalkane and aromatic hydrocarbons carries out catalytic reforming operation as reformer feed.
Then, the step-by-step operation carrying out next cycle is started.The stepping time at each step-by-step operation institute interval of each bed, Region dividing according to whole absorptive separation column is determined, a kind of possible aromatics absorption knockout tower Region dividing mode is, adsorption zone 3 beds, 5, desorption district bed, refining 3, district bed, buffering area 1 bed, but be not limited to this Region dividing mode.
In Extract E, the energy consumption of the purity of product, ultimate yield and adsorbing separation operation the results are shown in Table 1.
Comparative example 1
The pipe-line system of this comparative example comprises: total feed and exhaust tube, concetrated pipe, raw material F suction pipeline, a raffinate R derive pipeline, Extract E derivation pipeline, strippant D importing pipeline and bypass clean-up line.The lateral line canal of four strands of materials that pipe-line system comprises and bypass clean-up line are connected on concetrated pipe successively respectively by valve, wherein, the effect of bypass clean-up line is at the bed being about to carry out extracting or import materials handling out, by opening Bypass Control threshold switch, after the material of a bed on it is extracted out by corresponding fluid distributor 3, directly import this bed external pipeline and rinse.
This comparative example is used for carbon 8 aromatics seperation, and the correction data of product purity, yield and main operating parameters and embodiment 1 is as shown in table 1.
Comparative example 2
The pipe-line system of this comparative example comprises: total feed and exhaust tube, rotary valve, raw material F suction pipeline, a raffinate R derive pipeline, Extract E derivation pipeline, strippant D importing pipeline and two clean-up lines.Six strands of materials that pipe-line system comprises all are connected with each bed by rotary valve, by the Periodic Rotating of rotary valve, are communicated with by the material pipeline of correspondence with corresponding bed.Two clean-up lines one are import in adsorption tower, and its composition is identical with Extract E; Another for outwards to extract out in adsorption tower, and its composition is identical with strippant D.Two strands of flushing liquors were before extraction Extract E, imported or extracted adsorption tower out.
This comparative example is used for naphtha and is separated, and the correction data of product purity, yield and main operating parameters and embodiment 1 is as shown in table 1.
Table 1
| Product purity | Product yield | The desorb dosage D/F of process unit consumption of raw materials | |
| Embodiment 1 | 99.9％ | 99％ | 1.2 |
| Comparative example 1 | 99.5％ | 97％ | 2 |
Table 2
| Product purity | Product yield | The desorb dosage D/F of process unit consumption of raw materials | |
| Embodiment 2 | 90％ | 95％ | 0.8 |
| Comparative example 2 | 86％ | 93％ | 1 |
Can be found out by the data of above-described embodiment, comparative example and table 1, table 2, adopt equipment provided by the invention, purity, the ultimate yield of product in Extract E can be improved in adsorbing separation application, and reduce the energy consumption of adsorbing separation operation.
Claims (11)
1. the outer pipeline drip washing equipment of moving-bed adsorption tower, this equipment comprises:
What be connected with the fluid distributor (3) on the solids bed (2) in each adsorption tower (1) stretches out adsorption tower (1) total input and output material pipeline (4) outward;
Be positioned at adsorption tower (1) the first arm (5) being connected to total input and output material pipeline (4) side outward;
Be positioned at adsorption tower (1) the second arm (6) being connected to total input and output material pipeline (4) opposite side outward, the first arm (5) is connected with total input and output material pipeline (4) by a threeway with the second arm (6);
The raw material F be communicated with the first arm (5) imports pipeline (7);
The raffinate R be communicated with the first arm (5) derives pipeline (8);
The Extract E be communicated with the second arm (6) derives pipeline (9);
The strippant D be communicated with the second arm (6) imports pipeline (10);
The clean-up line (11) be all communicated with the first arm (5) and the second arm (6), clean-up line (11) has one at least;
The control valve (12) be connected respectively with each input and output material pipeline; And,
Control the control member (13) that each control valve (12) is opened or closed.
2. equipment according to claim 1, wherein, the diameter of the first arm (5) is identical with the diameter of total input and output material pipeline (4), or is less than the diameter of total input and output material pipeline (4).
3. equipment according to claim 1, wherein, first arm (5) arranges butterfly valve or porous plate with the junction of total input and output material pipeline (4) and the junction of the second arm (6) and total input and output material pipeline (4), prevents material from flowing into the second arm (6) from the first arm (5) or flowing into the first arm (5) from the second arm (6).
4. equipment according to claim 1, wherein, flushing liquor is imported the effect that total input and output material pipeline (4) reaches clean-up line by clean-up line (11), or the fluid in adsorption tower (1) is derived by total input and output material pipeline (4) effect that clean-up line (11) reaches clean-up line.
5. equipment according to claim 1, wherein, clean-up line (11) arranges multiply.
6. equipment according to claim 1 or 5, wherein, consisting of of the flushing liquor in multiply clean-up line (11) is identical or different.
7. equipment according to claim 1, wherein, control valve (12) is sequencing valve.
8. equipment according to claim 1, wherein, control member (13) is can by controlling the control system of the switch of the control valve (12) on every root lateral line canal.
9. equipment according to claim 8, wherein, control member (13) makes in each stepping time, ensure that in adsorption tower (1), the maximum lateral line canal different from of each solids bed (2) is communicated with, and ensures that raw material F, strippant D, raffinate R, Extract E are communicated with a fluid distributor (3) in adsorption tower (1) with flushing liquor.
10. the equipment according to claim 1-9, wherein, fluid distributor (3) is for multiple, and each fluid distributor (3) connects separately the outer pipeline drip washing equipment of a described adsorption tower separately.
The application of equipment in 11. claim 1-10 described in any one in adsorbing separation.
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| CN112494993A (en) * | 2020-12-28 | 2021-03-16 | 大连福佳·大化石油化工有限公司 | Adsorption tower stripping system and stripping method thereof |
| CN112546675A (en) * | 2020-12-28 | 2021-03-26 | 大连福佳·大化石油化工有限公司 | Improved steam stripping structure of adsorption tower for leaking agent from bed layer |
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