CN211005648U - Device for preparing glyoxylic acid by electrolyzing oxalic acid - Google Patents

Device for preparing glyoxylic acid by electrolyzing oxalic acid Download PDF

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CN211005648U
CN211005648U CN201921440110.4U CN201921440110U CN211005648U CN 211005648 U CN211005648 U CN 211005648U CN 201921440110 U CN201921440110 U CN 201921440110U CN 211005648 U CN211005648 U CN 211005648U
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cathode
anode
electrolysis
oxalic acid
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李海要
王林
孙敬哲
王贺生
郭利平
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Bluestar Beijing Chemical Machinery Co Ltd
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Bluestar Beijing Chemical Machinery Co Ltd
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Abstract

The utility model discloses a device of oxalic acid electrolysis preparation glyoxylic acid, including positive pole, negative pole, ionic membrane, center subassembly, the clamp is equipped with the ionic membrane between positive pole and negative pole, be provided with positive pole entry, negative pole entry, positive pole export and negative pole export on the center subassembly, a serial communication port, center subassembly upper end, lower extreme still are provided with upper end recess and lower extreme recess, upper end recess intercommunication positive pole export, negative pole export, lower extreme recess intercommunication positive pole entry, negative pole entry. The utility model discloses a glyoxylic acid device is prepared in oxalic acid electrolysis, upper end recess and the lower extreme groove structure that middle frame subassembly upper end, lower extreme adopted the back-to-back setting that extends along electrolysis trough width direction for device simple structure, low in manufacturing cost. In addition, the structure setting of upper end recess and lower extreme recess also makes the thickness in center subassembly negative and positive pole room chamber less, and liquid velocity of flow is high when equal flow, is favorable to the effective generation of glyoxylic acid.

Description

Device for preparing glyoxylic acid by electrolyzing oxalic acid
Technical Field
The invention belongs to the technical field of electrolysis, and particularly relates to a device for preparing glyoxylic acid by electrolyzing oxalic acid.
Background
The glyoxylic acid has a simple structure of HOCCOOH and a molecular formula of C2H2O3. Because the water-soluble organic acid salt is composed of an aldehyde group (-CHO) and a carboxyl group (-COOH), the organic acid-soluble organic acid. In addition, the demand for glyoxylic acid has increased due to the development of fine chemicals such as pharmaceuticals, organic intermediates, fragrances, and the like.
The increasing demand of glyoxylic acid also makes the synthesis routes thereof diverse, and at present, the synthesis routes of glyoxylic acid mainly comprise an ethylene oxidation method, an acetaldehyde oxidation method, a glyoxal nitric acid oxidation method, an oxalic acid electrolytic reduction method and the like. The methods have advantages and disadvantages, wherein the ethylene oxidation method has sufficient raw material sources and low price, but has long reaction time, pressure resistance and corrosion resistance required by equipment and lower product yield; the acetaldehyde oxidation method has higher production cost and more byproducts; the yield of the glyoxal nitric acid oxidation method is high, but the environmental pollution is serious. Therefore, among the numerous glyoxylic acid synthesis routes, the oxalic acid electrolytic reduction method is an environment-friendly and clean synthesis method which best meets the national conditions and has the most economic value. The method has the advantages of cheap and easily obtained raw materials, simple process flow, no environmental pollution and the like, and also draws wide attention.
The prior art is a research on a process for preparing glyoxylic acid by electrolyzing oxalic acid, for example, Chinese patent with publication number 1281063A mainly discloses a process for preparing glyoxylic acid by electrolyzing and reducing oxalic acid, and the optimal ranges of electrolysis temperature, current density and electrolyte flow rate are determined by the process research.
The research on the device is mostly limited to laboratory pilot-scale test devices and industrial pilot-scale test devices, for example, the oxalic acid electrolysis chamber mentioned in "the discussion of reducing oxalic acid to glyoxylic acid on Ti cathode" of No. 10, volume 1 of Guizhou science "is formed by standing organic glass, and is divided into a left chamber and a right chamber, which are detachable, and a pore plate structure is adopted in the middle, and an ion exchange membrane is clamped between the pore plates of the two chambers. Thus, the compressive strength of the film can be enhanced to prevent cracking due to fracture. The two pore plates are clamped by screws, and the sealing degree must reach the condition that only cation exchange exists between the two chambers and the two chambers are conductive, so that no liquid leakage phenomenon exists. The structure is mostly applied as a laboratory research process parameter for preparing glyoxylic acid by electrolyzing oxalic acid or an industrialized pilot plant, and has the advantages of simple integral structure, low cost, small total current and easy sealing. If the structure is applied to large-scale industrial production, the structure has the defects of inconvenient assembly and disassembly, large labor capacity and long time consumption due to more connecting plates.
Disclosure of Invention
The invention aims to provide a device for preparing glyoxylic acid by electrolyzing oxalic acid. The device for preparing glyoxylic acid by electrolyzing oxalic acid has the advantages of simple process, no environmental pollution, compact structure, low cost and long service life.
The invention is realized by the following technical scheme:
the device for preparing glyoxylic acid by electrolyzing oxalic acid comprises an anode, a cathode, an ionic membrane and a middle frame assembly, wherein the ionic membrane is clamped between the anode and the cathode, the anode, the ionic membrane and the cathode are clamped between the middle frame assembly, and the middle frame assembly is adjacent to the anode, the ionic membrane and the cathode.
The upper end grooves are arranged back to back, the upper end groove on one surface is communicated with the anode outlet, and the upper end groove on the other surface arranged back to back is communicated with the cathode outlet; the lower end grooves are arranged back to back, wherein the lower end groove on one surface is communicated with the anode inlet, and the lower end groove on the other surface, which is arranged back to back, is communicated with the cathode inlet.
The lower end groove communicated with the anode inlet is communicated with the upper end groove communicated with the anode outlet, and the lower end groove communicated with the cathode inlet is communicated with the upper end groove communicated with the cathode outlet.
The length of the upper end groove and the length of the lower end groove extend along the width direction of the middle frame assembly.
The electrolytic cell comprises an electrolytic cell, a cathode and a connecting plate, wherein the electrolytic cell is arranged in the cell group, one end of the anode or the cathode in each cell group extends out of the electrolytic cell, the other end of the cathode or the anode corresponding to the anode or the cathode extending out of the electrolytic cell extends out of the electrolytic cell, and the extending anode or the cathode is connected through the connecting plate.
Preferably, adjacent said protruding anodes or cathodes are connected in series by a connecting plate.
Wherein, the extending edge of the anode or the cathode extending out of the electrolytic chamber is provided with a hole, and the hole is fixedly connected with the hole on the connecting plate through a bolt.
Preferably, the connecting plates comprise a middle connecting plate and end connecting plates, the extending edge of the anode or the cathode extending out of the electrolytic chamber is closely adjacent to the middle connecting plate, and the end connecting plates are connected with an electrified power supply.
More preferably, the middle connecting plate is of a U-shaped structure.
Wherein, the structure of the cathode arranged in the electrolytic chamber is a non-porous structure.
Advantageous effects
The device for preparing glyoxylic acid by electrolyzing oxalic acid has the advantages of simple process, no environmental pollution, compact structure, low cost and long service life. The area of the cathode participating in the electrolytic reaction is of a non-porous structure, so that the cathode with pure lead as a component is not easily corroded by electrolyte, the service life of the electrode is prolonged, and the service life of the device is further prolonged. In addition, the more corrosion-resistant cathode also ensures that the cathode is not dissolved in the electrolyte because of the corrosion of the electrolyte during the electrolysis, thereby reducing the impurity content in the oxalic acid electrolyte, improving the product quality,
the cathode and the anode are connected in series by the middle connecting plate with a U-shaped structure, so that the whole device is compact in structure, and the problem of overlarge total current of a common PP tank frame is solved.
According to the device for preparing glyoxylic acid by electrolyzing oxalic acid, the upper end and the lower end of the middle frame component adopt the structures of the upper end groove and the lower end groove which are arranged back to back and extend along the width direction of the electrolytic bath, so that the device has a simple structure and low manufacturing cost. In addition, the structure setting of upper end recess and lower extreme recess also makes the thickness in center subassembly negative and positive pole room chamber less, and liquid velocity of flow is high when equal flow, is favorable to the effective generation of glyoxylic acid.
Drawings
FIG. 1 is a front view of an apparatus for producing glyoxylic acid by the electrolysis of oxalic acid;
FIG. 2 is a front view of a middle frame of a unit component of a device for preparing glyoxylic acid by electrolyzing oxalic acid;
FIG. 3 is a side view of a middle frame of a unit component of a device for preparing glyoxylic acid by electrolyzing oxalic acid;
FIG. 4 is a front view of the anode of the unit cell assembly;
FIG. 5 is a front view of the cathode of the cell assembly;
FIG. 6 is a front view of the connection plate 11;
FIG. 7 is a side view of the connecting plate 11;
FIG. 8 is a front view of the connection plate 12;
FIG. 9 is a side view of the connecting plate 12;
FIG. 10 is a schematic sectional view of a top view of an apparatus for producing glyoxylic acid by the electrolysis of oxalic acid.
Wherein: 1. an anode end frame assembly; 2. a middle frame component; 201. an upper end groove; 202. a lower end groove; 3. a cathode end frame assembly; 4. an anode; 5. a cathode; 6. a cathode terminal pad; 7. an anode terminal pad; 8. a mounting frame 9 and an extrusion plate; 10. a drawbar assembly; 11. a middle connecting plate; 12. an end connecting plate; 13. a cathode inlet; 14. an anode inlet; 15. a cathode outlet; 16. and (4) an anode outlet.
Detailed Description
The apparatus for producing glyoxylic acid by the electrolysis of oxalic acid according to the invention will now be described by way of a specific embodiment. Unless otherwise specified, the technical means used in the present invention are well known to those skilled in the art. In addition, the embodiments should be considered illustrative, and not restrictive, of the scope of the invention, which is defined solely by the claims. It will be apparent to those skilled in the art that various changes and modifications can be made in the invention without departing from the spirit and scope of the invention.
As shown in fig. 1, the device for preparing glyoxylic acid by electrolyzing oxalic acid comprises an anode end frame assembly 1, a middle frame assembly 2 and a cathode end frame assembly 3, wherein an anode end gasket 7 is arranged between the anode end frame assembly 1 and the middle frame assembly 2, a cathode end gasket 6 is arranged between the cathode end frame assembly 3 and the middle frame assembly 2, and an anode 4, an ionic membrane and a cathode 5 are clamped between the adjacent middle frame assemblies 2. The anode end frame assembly 1, the middle frame assembly 2 and the cathode end frame assembly 3 are clamped and fixed through a pull rod assembly 10 and an extrusion plate 9, and then are erected on the mounting frame 8.
The device for preparing glyoxylic acid by electrolyzing oxalic acid has the advantages of simple process, no environmental pollution, compact structure, low cost and long service life. The area of the cathode 5 participating in the electrolytic reaction is of a non-porous structure, so that the cathode 5 with pure lead is not easy to corrode by electrolyte, the service life of the electrode is prolonged, and the service life of the device is prolonged. In addition, the cathode 5 which is more corrosion-resistant also ensures that the cathode 5 is not dissolved in the electrolyte because of the corrosion of the electrolyte during the electrolysis, thereby reducing the impurity content in the oxalic acid electrolyte, improving the product quality,
as shown in fig. 2-3, the middle frame assembly 2 is provided with an anode inlet 14, a cathode inlet 13, an anode outlet 16 and a cathode outlet 15, wherein the upper end and the lower end of the middle frame assembly 2 are further provided with an upper end groove 201 and a lower end groove 202, the upper end groove 201 is communicated with the anode outlet 16 and the cathode outlet 15, and the lower end groove 202 is communicated with the anode inlet 14 and the cathode inlet 13. The upper end groove 201 is arranged back to back, wherein one surface of the upper end groove 201 is communicated with the anode outlet 16, and the other surface arranged back to back is communicated with the cathode outlet 15; the lower end grooves 202 are arranged back to back, wherein one side of the lower end groove 202 is communicated with the anode inlet 14, and the other side arranged back to back is communicated with the cathode inlet 13.
Wherein, the lower end groove 202 communicated with the anode inlet 14 is communicated with the upper end groove 201 communicated with the anode outlet 16, and the lower end groove 202 communicated with the cathode inlet 13 is communicated with the upper end groove 201 communicated with the cathode outlet 15. More preferably, the lengths of the upper end groove 201 and the lower end groove 202 extend along the width direction of the middle frame assembly.
According to the device for preparing glyoxylic acid by electrolyzing oxalic acid, the upper end and the lower end of the middle frame component 2 adopt the structures of the upper end groove 201 and the lower end groove 202 which extend along the width direction of the electrolytic bath and are arranged back to back, so that the device has a simple structure and low manufacturing cost. In addition, the structure of the upper end groove 201 and the lower end groove 202 also enables the thickness of the anode chamber and the cathode chamber in the middle frame assembly 2 to be smaller, and the liquid flow rate to be high under the same flow rate, thereby being beneficial to the effective generation of glyoxylic acid.
As shown in fig. 3-10, one end of the anode 4 or cathode 5 in each cell group extends out of the electrolytic chamber, the other end of the cathode 5 or anode 4 corresponding to the anode 4 or cathode 5 extending out of the electrolytic chamber extends out of the electrolytic chamber, and the extending anodes 4 or cathodes 5 are connected in series through a connecting plate.
Wherein, the extending edge of the anode 4 or the cathode 5 extending out of the electrolytic chamber is provided with a hole, and the hole is fixedly connected with the hole on the middle connecting plate 11 through a bolt.
Preferably, the connection plates comprise a middle connection plate 11 and end connection plates 12, the protruding edges of the anodes 4 or cathodes 5 protruding out of the electrolysis chamber are adjacent to the middle connection plate 11 provided with a U-shaped structure, and the end connection plates 12 are connected with an electrified power supply.
The anode 4 and the cathode 5 are connected in series by the middle connecting plate 11 with a U-shaped structure, so that the whole device is compact in structure, and the problem of overlarge total current of a common PP tank frame is solved.
According to the device for preparing glyoxylic acid by electrolyzing oxalic acid, the cathode 5 adopts a lead plate, the anode 4 adopts an oxygen-absorbing titanium coating electrode, the electrolytic reaction is carried out by adopting common parameters, the reaction temperature is about 24 ℃, and the yield can reach about 75%.

Claims (10)

1. The device for preparing glyoxylic acid by electrolyzing oxalic acid comprises an anode, a cathode, an ionic membrane and a middle frame assembly, wherein the ionic membrane is clamped between the anode and the cathode, the anode, the ionic membrane and the cathode are clamped between the middle frame assembly, and the middle frame assembly is adjacent to the anode, the ionic membrane and the cathode.
2. The device for preparing glyoxylic acid through oxalic acid electrolysis according to claim 1, wherein the upper end grooves are arranged back to back, one surface of each upper end groove is communicated with an anode outlet, and the other surface of each upper end groove, which is arranged back to back, is communicated with a cathode outlet; the lower end groove is arranged back to back, one surface of the lower end groove is communicated with the anode inlet, and the other surface of the lower end groove, which is arranged back to back, is communicated with the cathode inlet.
3. The device for preparing glyoxylic acid through oxalic acid electrolysis according to claim 2, wherein the lower end groove communicated with the anode inlet is communicated with the upper end groove communicated with the anode outlet, and the lower end groove communicated with the cathode inlet is communicated with the upper end groove communicated with the cathode outlet.
4. The apparatus for preparing glyoxylic acid by electrolyzing oxalic acid according to claim 1, wherein the length of the upper end groove and the lower end groove extends along the width direction of the middle frame component.
5. The device for preparing glyoxylic acid through oxalic acid electrolysis according to claim 1, further comprising a connecting plate, wherein one end of the anode or cathode in each unit group extends out of the electrolysis chamber, the other end of the cathode or anode corresponding to the anode or cathode extending out of the electrolysis chamber extends out of the electrolysis chamber, and the extending anodes or cathodes are connected through the connecting plate.
6. The apparatus for producing glyoxylic acid by electrolysis of oxalic acid according to claim 5 wherein adjacent protruding anodes or cathodes are connected in series by a connecting plate.
7. The device for preparing glyoxylic acid through oxalic acid electrolysis according to claim 6, wherein the protruding edge of the anode or the cathode protruding out of the electrolysis chamber is provided with a hole, and the hole is fixedly connected with the hole on the connecting plate through a bolt.
8. The apparatus for preparing glyoxylic acid by electrolysis of oxalic acid according to claim 7 wherein the connecting plates comprise a central connecting plate and end connecting plates, the projecting edge of the anode or cathode projecting from the electrolysis chamber being adjacent to the central connecting plate, the end connecting plates being connected to an electrical power supply.
9. The apparatus for preparing glyoxylic acid by electrolysis of oxalic acid according to claim 8 wherein the central web is of a U-shaped configuration.
10. The apparatus for preparing glyoxylic acid by electrolysis of oxalic acid according to claim 1, wherein the structure of the cathode placed in the electrolysis chamber is non-porous.
CN201921440110.4U 2019-09-02 2019-09-02 Device for preparing glyoxylic acid by electrolyzing oxalic acid Active CN211005648U (en)

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Application Number Priority Date Filing Date Title
CN201921440110.4U CN211005648U (en) 2019-09-02 2019-09-02 Device for preparing glyoxylic acid by electrolyzing oxalic acid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921440110.4U CN211005648U (en) 2019-09-02 2019-09-02 Device for preparing glyoxylic acid by electrolyzing oxalic acid

Publications (1)

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CN211005648U true CN211005648U (en) 2020-07-14

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