CN115228144A - Device and method for recovering potassium hydroxide in production of 2, 5-dimethyl-2, 5-hexanediol - Google Patents
Device and method for recovering potassium hydroxide in production of 2, 5-dimethyl-2, 5-hexanediol Download PDFInfo
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- CN115228144A CN115228144A CN202210896255.5A CN202210896255A CN115228144A CN 115228144 A CN115228144 A CN 115228144A CN 202210896255 A CN202210896255 A CN 202210896255A CN 115228144 A CN115228144 A CN 115228144A
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- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 title claims abstract description 246
- 238000000034 method Methods 0.000 title claims abstract description 32
- ZWNMRZQYWRLGMM-UHFFFAOYSA-N 2,5-dimethylhexane-2,5-diol Chemical compound CC(C)(O)CCC(C)(C)O ZWNMRZQYWRLGMM-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 105
- -1 hexynediol benzene Chemical compound 0.000 claims abstract description 76
- 238000000926 separation method Methods 0.000 claims abstract description 71
- 230000007246 mechanism Effects 0.000 claims abstract description 40
- 238000011084 recovery Methods 0.000 claims abstract description 8
- 239000000243 solution Substances 0.000 claims description 79
- 239000007864 aqueous solution Substances 0.000 claims description 50
- 238000004064 recycling Methods 0.000 claims description 8
- KXUSQYGLNZFMTE-UHFFFAOYSA-N hex-2-yne-1,1-diol Chemical class CCCC#CC(O)O KXUSQYGLNZFMTE-UHFFFAOYSA-N 0.000 claims description 5
- 230000008569 process Effects 0.000 abstract description 12
- ACCCMOQWYVYDOT-UHFFFAOYSA-N hexane-1,1-diol Chemical compound CCCCCC(O)O ACCCMOQWYVYDOT-UHFFFAOYSA-N 0.000 abstract description 2
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 15
- 230000009286 beneficial effect Effects 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 238000009434 installation Methods 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001308 synthesis method Methods 0.000 description 4
- UUIRDIWGVMSEBE-UHFFFAOYSA-N acetylene propan-2-one Chemical compound C#C.CC(C)=O UUIRDIWGVMSEBE-UHFFFAOYSA-N 0.000 description 3
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000003028 elevating effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 235000013547 stew Nutrition 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- CGHIBGNXEGJPQZ-UHFFFAOYSA-N 1-hexyne Chemical compound CCCCC#C CGHIBGNXEGJPQZ-UHFFFAOYSA-N 0.000 description 1
- IHJUECRFYCQBMW-UHFFFAOYSA-N 2,5-dimethylhex-3-yne-2,5-diol Chemical compound CC(C)(O)C#CC(C)(C)O IHJUECRFYCQBMW-UHFFFAOYSA-N 0.000 description 1
- JHGWQSGWUPCKNT-UHFFFAOYSA-N 2-tert-butyl-4-methyl-1,3,5-trinitrobenzene Chemical compound CC1=C([N+]([O-])=O)C=C([N+]([O-])=O)C(C(C)(C)C)=C1[N+]([O-])=O JHGWQSGWUPCKNT-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- VQXSOUPNOZTNAI-UHFFFAOYSA-N Pyrethrin I Natural products CC(=CC1CC1C(=O)OC2CC(=O)C(=C2C)CC=C/C=C)C VQXSOUPNOZTNAI-UHFFFAOYSA-N 0.000 description 1
- 239000007868 Raney catalyst Substances 0.000 description 1
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 description 1
- 229910000564 Raney nickel Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000009903 catalytic hydrogenation reaction Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 150000001451 organic peroxides Chemical class 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000002304 perfume Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- LUMVCLJFHCTMCV-UHFFFAOYSA-M potassium;hydroxide;hydrate Chemical compound O.[OH-].[K+] LUMVCLJFHCTMCV-UHFFFAOYSA-M 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- HYJYGLGUBUDSLJ-UHFFFAOYSA-N pyrethrin Natural products CCC(=O)OC1CC(=C)C2CC3OC3(C)C2C2OC(=O)C(=C)C12 HYJYGLGUBUDSLJ-UHFFFAOYSA-N 0.000 description 1
- VJFUPGQZSXIULQ-XIGJTORUSA-N pyrethrin II Chemical compound CC1(C)[C@H](/C=C(\C)C(=O)OC)[C@H]1C(=O)O[C@@H]1C(C)=C(C\C=C/C=C)C(=O)C1 VJFUPGQZSXIULQ-XIGJTORUSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/0208—Separation of non-miscible liquids by sedimentation
- B01D17/0214—Separation of non-miscible liquids by sedimentation with removal of one of the phases
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
- C01D1/04—Hydroxides
- C01D1/28—Purification; Separation
- C01D1/34—Purification; Separation with selective solvents
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention relates to the technical field of hexanediol production, in particular to a recovery device of potassium hydroxide in 2, 5-dimethyl-2, 5-hexanediol production, which comprises a separation kettle, a telescopic n-shaped pipe, a host, a controller, a camera and a lifting mechanism, wherein the separation kettle is provided with a strip-shaped transparent window, the camera is used for collecting standing layering information of liquid in the separation kettle through the transparent window, the lifting mechanism is connected with the n-shaped pipe, the host is used for calculating the height of a hexynediol benzene solution according to the standing layering information of the liquid, and the controller is used for controlling the lifting mechanism to drive the n-shaped pipe to be adjusted to the height which is the same as the height of the hexynediol benzene solution according to the height of the hexynediol benzene solution. The invention also provides a method for recovering potassium hydroxide in the production of 2, 5-dimethyl-2, 5-hexanediol based on the device. The invention can adjust the height of the n-shaped pipe based on the height of the hexyne diol benzene solution, has no limitation in use, and can meet different process requirements.
Description
Technical Field
The invention relates to the technical field of hexanediol production, in particular to a device and a method for recovering potassium hydroxide in 2, 5-dimethyl-2, 5-hexanediol production.
Background
2, 5-dimethyl-2, 5-hexanediol is a white flaky or powdery solid, odorless, easily soluble in water, molecular formula C8H18O2, used as solvent and organic synthetic intermediate, and mainly used for preparing pyrethrin, perfume, organic peroxide, artificial musk, polyethylene plastic cross-linking agent and polyether rubber. 2, 5-dimethyl-2, 5-hexanediol is generally prepared by an acetylene-acetone synthesis method, wherein acetylene and acetone are condensed with potassium hydroxide in a benzene solvent, and then are acidified by hydrochloric acid and hydrogenated, and the acetylene synthesis method is specifically prepared by three steps of normal pressure ethynylation, hydrolysis and hydrogenation. Acetylene and acetone are subjected to an ethynylation reaction with excessive potassium hydroxide in a solvent under normal pressure to generate 2, 5-dimethyl-3-hexyne-2, 5-diol potassium, then the potassium is hydrolyzed under an acidic condition to generate 2, 5-dimethyl-3-hexyne-2, 5-diol, and finally raney nickel is used as a catalyst to perform catalytic hydrogenation under the pressure of 2-2.5 MPa to obtain the product.
In the acetylene-acetone synthesis method, the consumption of potassium hydroxide is large, the cost is high, the potassium hydroxide forms an aqueous solution in the process, and if the aqueous solution is not recycled, the aqueous solution becomes waste, so that the resource waste is caused, and the environment is influenced. For this reason, in the prior art, there are related arts disclosing the recovery of potassium hydroxide, wherein an important link of the recovery of potassium hydroxide is: the characteristic that the potassium hydroxide aqueous solution is not compatible with benzene is utilized, and the potassium hydroxide is recovered by a separation method.
However, the existing device for recovering the potassium hydroxide by adopting the separation method has the following defects: 1. the height of the n-shaped pipe cannot be adjusted according to the height of the hexynediol benzene solution liquid, if the height of the hexynediol benzene solution liquid is higher than that of the n-shaped pipe, part of the hexynediol benzene solution is discharged, so that the effective separation of the hexynediol benzene solution and the potassium hydroxide aqueous solution cannot be realized, if the height of the hexynediol benzene solution liquid is lower than that of the n-shaped pipe, the potassium hydroxide aqueous solution cannot be discharged completely, and the height of the n-shaped pipe is fixed and unchanged, so that the device is only suitable for the condition that the height of the hexynediol benzene solution liquid is equal to that of the n-shaped pipe, has large use limitation, and cannot meet different process requirements; 2. after the potassium hydroxide aqueous solution is discharged, and the hexynediol benzene solution is discharged from other liquid discharge valves, liquid residues exist in the n-type pipe and the separation kettle; 3. when the potassium hydroxide aqueous solution starts to be discharged, the potassium hydroxide aqueous solution is discharged only by the natural flow of the liquid, and if the entire pipe is slightly clogged, there is a problem that the discharge is difficult or slow.
Disclosure of Invention
One aspect of the present invention is to provide a recovery apparatus for potassium hydroxide in the production of 2, 5-dimethyl-2, 5-hexanediol, which can adjust the height of an n-type pipe based on the height of a hexynediol benzene solution.
The recovery device for potassium hydroxide in 2, 5-dimethyl-2, 5-hexanediol production comprises a separation kettle, and further comprises a telescopic n-shaped pipe, a host, a controller, a camera and a lifting mechanism, wherein a long strip-shaped transparent window is arranged on the separation kettle, the camera is used for collecting liquid standing layering information in the separation kettle through the transparent window, the lifting mechanism is connected with the n-shaped pipe, the host is used for calculating the height of a hexynediol benzene solution according to the liquid standing layering information, and the controller is used for controlling the lifting mechanism to drive the n-shaped pipe to be adjusted to the height which is the same as the height of the hexynediol benzene solution according to the height of the hexynediol benzene solution.
The invention has the beneficial effects that: after the liquid in the separation kettle is kept still for a period of time, the potassium hydroxide aqueous solution is not dissolved with the hexynediol benzene solution, so the hexynediol benzene solution and the potassium hydroxide aqueous solution are layered up and down, the long strip-shaped transparent window is arranged on the separation kettle, so the liquid standing layering information in the separation kettle can be collected through the transparent window camera, the liquid standing layering information is transmitted to the host, the host calculates the height of the hexynediol benzene solution according to the liquid standing layering information and transmits an n-type pipe height adjusting instruction to the controller, the controller adjusts the height of the hexynediol benzene solution according to the height of the hexynediol benzene solution, the lifting mechanism is controlled to drive the n-type tube to be adjusted to the height which is the same as the height of the hexynediol benzene solution, so that the height of the n-type tube is adjusted according to the height of the hexynediol benzene solution, if the height of the hexynediol benzene solution is higher than the height of the n-type tube, the n-type tube is adjusted to extend to enable the height of the n-type tube to be consistent with the height of the hexynediol benzene solution, and if the height of the hexynediol benzene solution is lower than the height of the n-type tube, the n-type tube is adjusted to contract to enable the height of the n-type tube to be consistent with the height of the hexynediol benzene solution.
In a preferred embodiment of the present invention, the n-shaped pipe includes two corrugated pipes on two sides and an elbow pipe located between the two corrugated pipes, the lifting mechanism includes a hydraulic cylinder located below the elbow pipe, and a top end of a piston rod of the hydraulic cylinder is connected to the elbow pipe.
The beneficial effects are that: n type pipe adopts the syllogic design, and both sides adopt the telescopic bellows promptly, can stretch out and draw back the lift regulation, and the return bend that the centre set up then can guarantee with the firm connection in piston rod top of pneumatic cylinder, elevating system adopts pneumatic cylinder control lift, adjusts accurate stability.
In a preferred embodiment of the present invention, the controller is further configured to control the lifting mechanism to drive the n-type tube to contract and descend to the lowest initial position after the potassium hydroxide aqueous solution and the hexynediols solution are both discharged, so as to force the liquid remaining in the n-type tube and the separation kettle to be discharged.
The beneficial effects are that: after the potassium hydroxide aqueous solution and the hexynediol benzene solution are respectively discharged from the separation kettle, the potassium hydroxide aqueous solution is discharged from the n-type pipe, and the hexynediol benzene solution is directly discharged from the separation kettle, so that liquid residues exist in the n-type pipe and the separation kettle.
In a preferred embodiment of the present invention, the controller is further configured to control the lifting mechanism to drive the n-type tube to extend and rise to the highest position before controlling the lifting mechanism to drive the n-type tube to adjust the height, so as to rapidly introduce the potassium hydroxide aqueous solution into the n-type tube.
The beneficial effects are that: when the potassium hydroxide aqueous solution starts to flow into the n-shaped pipe, the potassium hydroxide aqueous solution only flows into the n-shaped pipe through the natural flow of the liquid, once the whole pipeline is slightly blocked, the problem that the potassium hydroxide aqueous solution is difficult to flow into or flows slowly is solved.
The preferable embodiment of the invention is that the camera is installed on the n-shaped pipe, and the host is also used for controlling the camera to respectively collect standing and layering information of the liquid in the separation kettle at the initial position and the highest position.
The beneficial effects are that: the camera is installed on n type pipe, and n type pipe plays the effect of camera installation part simultaneously, and the position of camera will change along with the altitude variation of n type pipe like this, need not additionally to set up the mounting structure of camera and drive the elevation structure that the camera goes up and down, just can realize collecting the layering information that stews of liquid in the separation cauldron in the high position of difference. The invention further discloses a method for collecting standing layering information of liquid in a separation kettle by a host computer, wherein the host computer controls the camera to collect the standing layering information of the liquid in the separation kettle at an initial position and a highest position respectively, and the design can avoid the problem of larger calculation error caused by the fact that the camera collects the information at a fixed height and an angle no matter how the total liquid level in the separation kettle is fixed due to the fixed position of the camera.
The preferable embodiment of the invention is that a retractable graduated scale is arranged at the transparent window of the separation kettle.
Has the advantages that: through the scalable scale that transparent window department set up, can be when needs check-up, the height of hexyne diol benzene solution is measured through scalable scale to the manual work, and then carries out the error check to the height of hexyne diol benzene solution that the host computer calculated.
Another aspect of the present invention is to provide a method for recovering potassium hydroxide in the production of 2, 5-dimethyl-2, 5-hexanediol, in which the height of n-type tubes can be adjusted based on the height of hexynediols benzene solution to meet different process requirements.
A method for recovering potassium hydroxide in the production of 2, 5-dimethyl-2, 5-hexanediol comprises the following steps: the camera collects the standing and layering information of the liquid in the separation kettle; the host calculates the height of the hexyne diol benzene solution according to the liquid standing layering information; the controller controls the lifting mechanism to drive the n-shaped pipe to adjust the height according to the height of the hexynediol benzene solution, so that the height of the n-shaped pipe is the same as that of the hexynediol benzene solution.
Description of the invention: the liquid in the separation kettle comprises a potassium hydroxide aqueous solution and a hexynediol benzene solution, and the hexynediol benzene solution and the potassium hydroxide aqueous solution are layered up and down after standing for a period of time because the potassium hydroxide aqueous solution is not dissolved in the hexynediol benzene solution.
The principle of the method of the invention lies in that: the liquid standing and layering information in the separation kettle can be acquired through the transparent window camera, the liquid standing and layering information is transmitted to the host, the host calculates the height of the hexynediol benzene solution according to the liquid standing and layering information, and sends a height adjusting instruction of the n-type pipe to the controller, and the controller controls the lifting mechanism to drive the n-type pipe to be adjusted to the height which is the same as the height of the hexynediol benzene solution according to the height of the hexynediol benzene solution.
The method of the invention has the beneficial effects that: no matter the amount of the hexynediol benzene solution generated in the production of 2, 5-dimethyl-2, 5-hexanediol, the height of the n-shaped pipe can be adjusted according to the amount of the hexynediol benzene solution liquid, namely the liquid height, so that the effective separation of the potassium hydroxide aqueous solution and the hexynediol benzene solution is realized, the use is unlimited, and different process requirements can be met.
The method of the invention preferably has an embodiment that before controlling the lifting mechanism to drive the n-shaped pipe to adjust the height, the controller further controls the lifting mechanism to drive the n-shaped pipe to extend and rise to the highest position, and the potassium hydroxide aqueous solution is rapidly introduced into the n-shaped pipe.
Has the advantages that: if the potassium hydroxide aqueous solution flows into the n-shaped pipe only through natural flow of the potassium hydroxide aqueous solution, once the whole pipeline is slightly blocked, the problem that the potassium hydroxide aqueous solution is difficult to flow in or slow to flow in exists.
The method of the invention preferably has the following implementation mode that after the potassium hydroxide aqueous solution and the hexyne diol benzene solution are discharged, the controller also controls the lifting mechanism to drive the n-shaped pipe to shrink and descend to the lowest initial position, so that residual liquid in the n-shaped pipe and the separation kettle is forced to be discharged.
Description of the invention: the aqueous potassium hydroxide solution was discharged from the n-type tube, and the hexynediol benzene solution was discharged directly from the separation vessel, so that liquid residues remained in both the n-type tube and the separation vessel.
Has the advantages that: by adopting the method, an additional cleaning or residual liquid discharging structure is not needed, the n-shaped pipe is driven to shrink, descend and reset only through the lifting mechanism, the internal space of the n-shaped pipe is reduced and the internal air is compressed in the resetting process, and the method is similar to the cylinder principle, so that the residual liquid in the n-shaped pipe and the residual liquid in the separation kettle are forced to be discharged, and the problem that the residual liquid influences the next separation or easily blocks the n-shaped pipe is avoided.
The method of the invention is preferably implemented in that the cameras collect the standing and layering information of the liquid in the separation kettle at the initial position and the highest position respectively.
The beneficial effects are that: 1. the camera is installed on the n-type pipe, and the n-type pipe plays the role of a camera installation part at the same time, so that the position of the camera can be changed along with the height change of the n-type pipe, and the liquid standing layering information in the separation kettle can be acquired at different height positions without additionally arranging an installation structure of the camera and a lifting structure for driving the camera to lift. 2. Can avoid because of the camera position is fixed, no matter how the total liquid level height in the separation cauldron, all with the great problem of calculation error that fixed height and angle acquisition information brought, the camera is in initial position and highest position acquisition separation cauldron respectively the layering information that stews, solution above-mentioned problem that can be fine, the initial position of n type pipe is in the below that the layering was stood to liquid usually, and the highest position of n type pipe is in the top that the layering was stood to liquid, from upper and lower two height position and angle position acquisition information respectively, pass to the host computer and fuse the processing, the analysis, the height of the hexynediol benzene solution of calculating will be more accurate.
Drawings
FIG. 1 is a schematic structural diagram of a first embodiment of a potassium hydroxide recycling apparatus for producing 2, 5-dimethyl-2, 5-hexanediol according to the present invention;
FIG. 2 is a schematic flow diagram of a process for recovering potassium hydroxide from 2, 5-dimethyl-2, 5-hexanediol according to the present invention;
FIG. 3 is a schematic structural diagram of a second embodiment of a potassium hydroxide recycling apparatus in the production of 2, 5-dimethyl-2, 5-hexanediol according to the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
the reference numbers in figure 1 of the specification include: the device comprises a separation kettle 1, a window 2, an n-shaped pipe 3, a bent pipe 301, a corrugated pipe 302, a hydraulic cylinder 4, a piston rod 5, a base 6, a camera 7, a first liquid discharge pipe 8, a first valve 9, a second liquid discharge pipe 10, a second valve 11, a third liquid discharge pipe 12 and a third valve 13.
Example one
The recovery device of potassium hydroxide in the production of 2, 5-dimethyl-2, 5-hexanediol disclosed in this example is applied to the separation of a potassium hydroxide aqueous solution and a hexynediol benzene solution in the process of recovering potassium hydroxide in the production of 2, 5-dimethyl-2, 5-hexanediol by using an acetylene-acetone synthesis method. In the prior art, a 30% potassium hydroxide aqueous solution which contains a part of organic solvent and a by-product, namely, a hexynediol benzene solution, comes out of a reaction kettle, and because the potassium hydroxide aqueous solution has high density and the hexynediol benzene solution has low density, after standing for a period of time, the potassium hydroxide aqueous solution is deposited on the lower layer, and the hexynediol benzene solution is suspended on the upper layer.
As shown in attached figure 1, the recovery device of potassium hydroxide in the production of 2, 5-dimethyl-2, 5-hexanediol comprises a separation kettle 1, a telescopic n-shaped pipe 3, a host machine, a controller, a camera 7 and a lifting mechanism. One end of the n-shaped pipe 3 is connected with a first liquid discharge pipe 8, the other end of the n-shaped pipe 3 is connected with a second liquid discharge pipe 10, a first valve 9 is arranged on the first liquid discharge pipe 8, a second valve 11 is arranged on the second liquid discharge pipe 10, the first liquid discharge pipe 8 is connected with the bottom of the side surface of the separation kettle 1, a third liquid discharge pipe 12 is further connected with the bottom of the side surface of the separation kettle 1, a third valve 13 is arranged on the third liquid discharge pipe 12, and the third liquid discharge pipe 12 is used for discharging the hexynediol benzene solution.
The separation kettle 1 is provided with a strip-shaped transparent window 2, the transparent window 2 of the separation kettle 1 is provided with a telescopic graduated scale, the telescopic graduated scale is similar to a tape measure in form, the graduated scale can be drawn out from the separation kettle body, and the corresponding height can be drawn out for measurement according to the required measuring height.
In this embodiment, the n-type pipe 3 includes corrugated pipes 302 on two sides and an elbow 301 located between the two corrugated pipes 302, and the lifting mechanism is connected to the n-type pipe 3, specifically: elevating system including being located the pneumatic cylinder 4 of return bend 301 below, 5 tops of the piston rod of pneumatic cylinder 4 with return bend 301 is fixed, and pneumatic cylinder 4 installs on base 6, the lower part body of first fluid-discharge tube 8 and second fluid-discharge tube 10 is arranged in respectively the upper portion of base 6 supports through 6 upper portions of base. The hydraulic cylinder 4 is electrically connected with the controller and is controlled by the controller.
The camera 7 is installed on the n-shaped pipe 3, specifically, an installation plate is arranged on the side surface of the n-shaped pipe 3, and the camera 7 is installed on the installation plate. The camera 7 is in wireless communication connection with the host, and the host is in two-way communication with the controller.
In this embodiment, the n-type tube 3 is located at four levels in one separation process cycle, namely, the initial position with the lowest level, the highest position, the position with the same level as the hexynediol benzene solution, and the initial position with the lowest level.
And the controller is used for controlling the lifting mechanism to drive the n-shaped pipe 3 to extend and rise from the initial position to the highest position before controlling the lifting mechanism to drive the n-shaped pipe 3 to adjust the height, and rapidly introducing the potassium hydroxide aqueous solution into the n-shaped pipe 3. By adopting the design, an extra drainage or dredging structure is not required to be arranged, the n-type pipe 3 is only driven by the lifting mechanism to be extended to the highest position, the internal space of the n-type pipe 3 is enlarged, and the internal pressure of the n-type pipe 3 is reduced, so that the potassium hydroxide aqueous solution is quickly introduced into the n-type pipe 3, and the pipeline of the n-type pipe 3 is dredged in the quick drainage process.
The camera 7 is used for collecting liquid standing layering information in the separation kettle 1 through the transparent window 2, and specifically comprises: and controlling the camera 7 to respectively start and collect liquid standing layering information in the separation kettle 1 at the initial position and the highest position through the host. In this embodiment, the liquid standing and layering information refers to collecting a liquid standing and layering image.
The host is used for calculating the height of the hexynediol benzene solution according to the liquid standing layering information, and the controller is used for controlling the lifting mechanism to drive the n-type pipe 3 to be adjusted to the height which is the same as the height of the hexynediol benzene solution according to the height of the hexynediol benzene solution. In this embodiment, the host calculates the height of the hexyne diol benzene solution according to the liquid standing layering information by using the existing image processing analysis technology, which includes denoising and binarization processing of an image, and so on, and analyzes a boundary between the two solutions, and calculates the height of the hexyne diol benzene solution according to the boundary.
In this embodiment, the controller is further configured to control the lifting mechanism to drive the n-type tube 3 to contract and descend to the lowest initial position after the potassium hydroxide aqueous solution and the hexynediols solution are both discharged, so as to force the liquid remaining in the n-type tube 3 and the separation kettle 1 to be discharged.
The invention has the advantages that the potassium hydroxide aqueous solution is discharged from the n-type pipe 3, and the hexyne diol benzene solution is directly discharged from the separation kettle 1, so that liquid residues exist in the n-type pipe 3 and the separation kettle 1, and the invention has the ingenious point that an additional cleaning or residual liquid discharging structure is not needed, the n-type pipe 3 is driven to shrink and descend to reset only through a lifting mechanism, in the resetting process, the internal space of the n-type pipe 3 is reduced, the internal air is compressed, and the air cylinder principle is similar to that of an air cylinder, so that the liquid residues in the n-type pipe 3 and the separation kettle 1 are forced to be discharged, and the problem that the next separation is influenced by the residual liquid or the n-type pipe 3 is easily blocked is avoided.
As shown in fig. 2: the embodiment also discloses a method for recovering potassium hydroxide in the production of 2, 5-dimethyl-2, 5-hexanediol, which comprises the following steps:
the controller controls the lifting mechanism to drive the n-shaped pipe 3 to extend and rise from the initial position to the highest position, and the potassium hydroxide water solution is quickly introduced into the n-shaped pipe 3.
The camera 7 collects liquid standing layering information in the separation kettle 1, and specifically comprises the following steps: the camera 7 collects standing layering information of the liquid in the separation kettle 1 at an initial position and a highest position respectively. The host calculates the height of the hexyne diol benzene solution according to the liquid standing layering information; the controller controls the lifting mechanism to drive the n-shaped pipe 3 to adjust the height according to the height of the hexyne diol benzene solution, so that the height of the n-shaped pipe 3 is the same as that of the hexyne diol benzene solution.
After the potassium hydroxide aqueous solution and the hexyne glycol benzene solution are both discharged, the controller controls the lifting mechanism to drive the n-shaped pipe 3 to contract and descend to the lowest initial position, so that residual liquid in the n-shaped pipe 3 and the separation kettle 1 is forced to be discharged.
Example two
The reference numbers in figure 3 of the specification include: the device comprises a separation kettle 1, a window 2, an n-shaped pipe 3, a bent pipe 301, a sleeve 302, an air cylinder 4, a piston rod 5, a base 6, a camera 7, a first liquid discharge pipe 8, a first baffle plate 9, a second liquid discharge pipe 10, a second baffle plate 11, a third liquid discharge pipe 12 and a valve 13.
In this embodiment, the telescopic n-shaped pipe 3 includes sleeves 302 on both sides and an elbow 301 located between the two sleeves 302, the elbow 301 includes a first branch pipe and a second branch pipe, the lower portions of the first branch pipe and the second branch pipe extend into the two sleeves 302 respectively, sealing rings are arranged between the first branch pipe and the two sleeves 302, the lifting mechanism includes a cylinder 4 located below the elbow 301, and the top end of a piston rod 5 of the cylinder 4 is connected with the elbow 301.
Sealing rings are arranged between the first branch pipe and the two sleeve pipes 302, so that the lifting of the whole elbow pipe 301 driven by the piston rod 5 of the cylinder 4 is not influenced, and liquid can be prevented from overflowing from gaps between the first branch pipe and the two sleeve pipes 302.
In this embodiment, the difference from the first embodiment is also that: in this embodiment, one end of the n-type pipe 3 is connected to the bottom of the side surface of the separation kettle 1 through the first liquid discharge pipe 8, the other end of the n-type pipe 3 is connected to the second liquid discharge pipe 10, the first liquid discharge pipe 8 and the second liquid discharge pipe 10 are square pipes, the two casing pipes 302 are also square pipes, and the first liquid discharge pipe 8, the second liquid discharge pipe 10 and the two casing pipes 302 are the same in size.
In this embodiment, a first stopper 9 is provided at the lower part of the first branch pipe, the first stopper 9 blocks the pipe of the first drain pipe 8 when the n-type pipe 3 is at the lowest position, automatically opens the pipe of the first drain pipe 8 when the n-type pipe 3 is extended to a high position, and allows the potassium hydroxide aqueous solution to smoothly flow into the n-type pipe 3, and similarly, a second stopper 11 is provided at the lower part of the second branch pipe, the second stopper 11 blocks the pipe of the second drain pipe 10 when the n-type pipe 3 is at the lowest position, and automatically opens the pipe of the second drain pipe 10 when the n-type pipe 3 is extended to a high position, and allows the potassium hydroxide aqueous solution to smoothly flow out of the n-type pipe 3.
By adopting the scheme of the embodiment, the valves 13 do not need to be additionally arranged on the first liquid discharge pipe 8 and the second liquid discharge pipe 10 respectively, the opening and closing of the valves 13 do not need to be controlled manually or automatically through a controller, but the first liquid discharge pipe 8 and the second liquid discharge pipe 10 are opened simultaneously in the process of adjusting the height of the n-shaped pipe 3 to enable the height of the n-shaped pipe to be the same as the height of the hexynediol benzene solution, so that the whole n-shaped pipe 3 equivalently plays a role in opening and closing the valves 13.
In this embodiment, the extension heights of the n-type tubes 3 are different according to the heights of the hexynediol benzene solutions, which means that the ranges of the first and second baffles 9 and 11 for opening the first and second liquid discharge tubes 8 and 10 by lifting are different, but in the production of 2, 5-dimethyl-2, 5-hexanediol, the amount of the hexynediol benzene solution and the amount of the potassium hydroxide aqueous solution are in a proportional relationship, and if the amount of the hexynediol benzene solution is smaller, the corresponding amount of the potassium hydroxide aqueous solution is smaller, so although the extension height of the n-type tubes 3 is relatively lower, the ranges of the first and second baffles 9 and 11 for opening the first and second liquid discharge tubes 8 and 10 by lifting are smaller, the discharge time of the potassium hydroxide aqueous solution is not affected because the amount of the potassium hydroxide aqueous solution is smaller, and compared with the case that the extension height of the n-type tubes 3 is higher, the discharge time of the potassium hydroxide aqueous solution is not extended, and the subsequent processes are not affected.
Based on the recycling device of this example, the recycling method of potassium hydroxide in the production of 2, 5-dimethyl-2, 5-hexanediol in this example is as follows:
when the n-shaped pipe 3 is at the lowest initial position, the first baffle 9 and the second baffle 11 respectively block the first liquid discharge pipe 8 and the second liquid discharge pipe 10, the host controls the camera 7 to collect standing layering information of liquid in the separation kettle 1 through the transparent window 2, and transmits the standing layering information of the liquid to the host;
when the potassium hydroxide aqueous solution needs to be separated and discharged from the separation kettle 1, the air cylinder 4 drives the bent pipe 301 to rise to the highest position along the two sleeves 302, so that the first baffle 9 and the second baffle 11 completely open the first liquid discharge pipe 8 and the second liquid discharge pipe 10, the potassium hydroxide aqueous solution quickly flows into the n-shaped pipe 3 from the separation kettle 1, the effect of quick drainage is achieved, and meanwhile the effect of dredging the first liquid discharge pipe 8, the n-shaped pipe 3 and the second liquid discharge pipe 10 is also achieved;
after the position of the elbow pipe 301 rises to the highest position, the host controls the camera 7 to acquire liquid standing layering information in the separation kettle 1 through the transparent window 2 and transmit the liquid standing layering information to the host, the host calculates the height of the hexynediol benzene solution comprehensively according to the liquid standing layering information acquired twice respectively, and sends a control instruction to the controller according to the height information of the hexynediol benzene solution;
after the controller receives the control instruction, the controller controls the air cylinder 4 to act, the piston rod 5 of the air cylinder 4 drives the bent pipe 301 to descend to a corresponding height, and the corresponding height enables the height of the whole n-shaped pipe 3 to be the same as the calculated height of the hexynediol benzene solution;
the potassium hydroxide aqueous solution flows out through the first liquid discharge pipe 8, the n-shaped pipe 3 and the second liquid discharge pipe 10 in sequence until the potassium hydroxide aqueous solution is discharged, the controller controls the cylinder 4 to act, and the piston rod 5 of the cylinder 4 drives the bent pipe 301 to descend to the lowest initial position for resetting;
the hexynediols benzene solution in the separation vessel 1 was discharged through a third drain line 12 and a valve 13.
The foregoing are merely exemplary embodiments of the invention, and those skilled in the art who have the benefit of this disclosure will be able to ascertain all the prior art that has the benefit of the present teachings and the ability to use routine experimentation prior to the date of this application, and will be able to embody the invention as described herein in a manner that is not necessary to the achievement of the stated objectives and practice of the disclosed embodiments.
It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be defined by the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. The recovery device for potassium hydroxide in 2, 5-dimethyl-2, 5-hexanediol production comprises a separation kettle and is characterized by further comprising a telescopic n-type pipe, a host, a controller, a camera and a lifting mechanism, wherein a long strip-shaped transparent window is arranged on the separation kettle, the camera is used for collecting liquid standing layering information in the separation kettle through the transparent window, the lifting mechanism is connected with the n-type pipe, the host is used for calculating the height of a hexynediol benzene solution according to the liquid standing layering information, and the controller is used for controlling the lifting mechanism to drive the n-type pipe to be adjusted to the height which is the same as the height of the hexynediol benzene solution according to the height of the hexynediol benzene solution.
2. The recycling device of potassium hydroxide in the production of 2, 5-dimethyl-2, 5-hexanediol according to claim 1, wherein the n-shaped pipe comprises two corrugated pipes at two sides and a bent pipe between the two corrugated pipes, the lifting mechanism comprises a hydraulic cylinder located below the bent pipe, and the top end of a piston rod of the hydraulic cylinder is connected with the bent pipe.
3. The apparatus for recovering potassium hydroxide in the production of 2, 5-dimethyl-2, 5-hexanediol according to claim 1 or 2, wherein the controller is further configured to control the lifting mechanism to drive the n-type tube to shrink down to the lowest initial position after the potassium hydroxide solution and the hexynediols solution are both discharged, so as to force the residual liquid in the n-type tube and the separation tank to be discharged.
4. The recycling device of potassium hydroxide in the production of 2, 5-dimethyl-2, 5-hexanediol according to claim 3, wherein the controller is further configured to control the lifting mechanism to drive the n-type pipe to extend and rise to the highest position before controlling the lifting mechanism to drive the n-type pipe to adjust the height, and rapidly introduce the potassium hydroxide aqueous solution into the n-type pipe.
5. The recycling device of potassium hydroxide in the production of 2, 5-dimethyl-2, 5-hexanediol according to claim 4, wherein the camera is installed on the n-shaped pipe, and the host is further used for controlling the camera to collect standing and layering information of the liquid in the separation tank at the initial position and the highest position respectively.
6. The apparatus for recovering potassium hydroxide in the production of 2, 5-dimethyl-2, 5-hexanediol according to claim 1, wherein a retractable scale is provided at a transparent window of the separation vessel.
7. A method for recovering potassium hydroxide in the production of 2, 5-dimethyl-2, 5-hexanediol is characterized by comprising the following steps:
the camera collects the standing and layering information of the liquid in the separation kettle; the host machine calculates the height of the hexyne diol benzene solution according to the liquid standing layering information; the controller controls the lifting mechanism to drive the n-shaped pipe to adjust the height according to the height of the hexynediol benzene solution, so that the height of the n-shaped pipe is the same as that of the hexynediol benzene solution.
8. The method for recycling potassium hydroxide in the production of 2, 5-dimethyl-2, 5-hexanediol according to claim 7, wherein the controller controls the lifting mechanism to drive the n-type pipe to extend and rise to the highest position before controlling the lifting mechanism to drive the n-type pipe to adjust the height, and the potassium hydroxide aqueous solution is rapidly introduced into the n-type pipe.
9. The method for recovering potassium hydroxide in the production of 2, 5-dimethyl-2, 5-hexanediol according to claim 8, wherein after the potassium hydroxide aqueous solution and the hexynediol benzene solution are both discharged, the controller further controls the lifting mechanism to drive the n-type pipe to shrink and descend to the lowest initial position, so as to force the liquid remained in the n-type pipe and the separation kettle to be discharged.
10. The method for recovering potassium hydroxide in the production of 2, 5-dimethyl-2, 5-hexanediol according to claim 9, wherein the cameras collect information on the standing and layering of the liquid in the separation tank at an initial position and a highest position, respectively.
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|---|---|---|---|
| CN202210896255.5A CN115228144A (en) | 2022-07-28 | 2022-07-28 | Device and method for recovering potassium hydroxide in production of 2, 5-dimethyl-2, 5-hexanediol |
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| CN202210896255.5A CN115228144A (en) | 2022-07-28 | 2022-07-28 | Device and method for recovering potassium hydroxide in production of 2, 5-dimethyl-2, 5-hexanediol |
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