Combination device for glyoxylic acid synthesis reaction

Abstract

The utility model discloses a combined device for glyoxylic acid synthesis reaction, and belongs to the technical field of chemical production equipment and glyoxylic acid synthesis reaction. The device is formed by combining a synthesis reaction kettle, an external water heater, a nitric acid metering tank, a liquid guide device, a gas-liquid mixing ejector, a tubular reactor, an external heat exchanger, an anti-entrainment damper, a reflux condenser, a tail gas absorption tower, an absorption liquid tank and the like. The device is characterized in that an external water heater is additionally arranged, a liquid guiding device is additionally arranged at a high position, a gas-liquid mixing ejector and a tubular reactor are introduced to participate in a glyoxylic acid synthesis reaction, an external heat exchanger is additionally arranged, and an anti-entrainment damper is additionally arranged on a tail gas pipeline; according to the technical scheme, the combined device for the glyoxylic acid synthesis reaction solves the problems that acidic reaction liquid is difficult to pump upwards, the kettle type reaction efficiency is low, the reaction liquid is carried by high-speed tail gas flow, and the like; the device also has the characteristics of safe flow, high reaction efficiency and convenience in operation.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the chemical production equipment and glyoxylic acid synthetic reaction technical field, especially relates to a kind of combination device of glyoxylic acid synthetic reaction. BACKGROUND

[0002] Glyoxylic acid is an important organic synthesis intermediate, widely used in organic synthesis intermediates such as perfume, medicine, pesticide, food, varnish raw material, dye, plastic additive, also can be used in vanillin, ethyl vanillin, mandelic acid, p-hydroxyphenylglycine, p-hydroxyphenylacetic acid, allantoin and other products.

[0003] "Glyoxal nitric acid oxidation method" is the relatively mature process, relatively low cost glyoxylic acid synthesis method, it is glyoxal in the composite catalyst is oxidized to glyoxylic acid by dilute nitric acid, oxidation process will by-product a large amount of oxalic acid and nitrogen oxides.

[0004] The chemical reaction equation of glyoxal nitric acid oxidation method is as follows:

[0005] 3CHO-CHO + 2HNO3→ 3CHO-COOH + 2NO↑+ H2O

[0006] 3CHO-COOH + 2HNO3 → 3HOOC-COOH + 2NO↑+ H2O.

[0007] In prior art, the reaction device of glyoxal nitric acid oxidation method for synthesizing glyoxylic acid mostly uses reaction kettle to produce one by one, the obvious deficiency of prior art process device mainly shows in unstable process, reaction kettle jacket uses steam heating to easily cause temperature to rise too fast, since the heat exchange area of reaction kettle jacket is relatively small, when needing to reduce temperature, temperature cannot be reduced in time, so that it is easy to cause reaction liquid to boil, gas-liquid entrainment and other greater process risks; The obvious deficiency of single reaction kettle for synthesis reaction is low reaction efficiency, large output of by-product oxalic acid; Due to insufficient air quantity and slow adding mode, also cause nitrogen monoxide tail gas to be not oxidized into nitrogen dioxide in time, which brings greater difficulty to tail gas absorption, and further affect production efficiency and cost reduction. SUMMARY

[0008] The utility model discloses a kind of combination device of glyoxylic acid synthetic reaction based on the purpose of solving above problems, its main innovation point is in process design and component coordination aspect: (1) external water heater is additionally installed, (2) liquid guide is additionally installed in upper high position on synthetic reaction kettle side, (3) gas-liquid mixed injector and tubular reactor are introduced to participate in glyoxylic acid synthetic reaction, (4) external heat exchanger is set, (5) anti-entrainment damper is additionally installed on tail gas pipeline;The utility model discloses a kind of combination device of glyoxylic acid synthetic reaction, it effectively solves the problem of difficult to be drawn before acidic reaction liquid, solves the problem of low efficiency of kettle type reaction, solves the problem of high-speed tail gas flow entraining reaction liquid etc.;The utility model discloses a kind of combination device of glyoxylic acid synthetic reaction also has the characteristics of process safety, high reaction efficiency, convenient operation.

[0009] The utility model discloses a kind of combination device of glyoxylic acid synthetic reaction, it includes: synthetic reaction kettle, external water heater, steam control valve, steam disperser, hot water circulating pump, jacket water inlet, jacket backwater pipe, backwater pipe, liquid guide, liquid suction pipe, reaction liquid circulating pump, gas-liquid mixed injector, air purifier, tubular reactor, external heat exchanger, nitric acid measuring tank, nitric acid disperser, tail gas pipeline, anti-entrainment damper, reflux condenser, anti-blocking inclined pipe, absorption liquid tank, built-in heat exchanger, tail gas absorption tower, filler module, annular spray pipe, harmless tail gas outlet, characterized in that, the two sides of the synthetic reaction kettle are connected with external water heater by jacket water inlet and jacket backwater pipe, one end of the liquid guide is connected with the upper portion of synthetic reaction kettle by pipeline, and extends to the middle lower portion of synthetic reaction kettle by liquid suction pipe, the liquid guide is connected with gas-liquid mixed injector by reaction liquid circulating pump, the side of the gas-liquid mixed injector is connected with air purifier, the gas-liquid mixed injector is connected with tubular reactor by pipeline forward, the tubular reactor is connected with external heat exchanger forward, the external heat exchanger is connected with the upper portion of synthetic reaction kettle downward, and extends to the inside of synthetic reaction kettle by pipeline, the lower portion of the nitric acid measuring tank is connected with the upper portion of synthetic reaction kettle by pipeline, and is connected with nitric acid disperser by extending to the inside of synthetic reaction kettle by pipeline, the anti-entrainment damper is arranged on the tail gas pipeline of the upper portion of synthetic reaction kettle, is connected with synthetic reaction kettle downward, is connected with reflux condenser upward, the reflux condenser is communicated with the bottom of tail gas absorption tower along tail gas pipeline by anti-blocking inclined pipe forward, the tail gas absorption tower is arranged directly above absorption liquid tank.

[0010] Preferably, the utility model discloses a kind of combination device of glyoxylic acid synthetic reaction, characterized in that, the external water heater main body is stainless steel tank with 2.0m diameter, volume is 8~10m 3The steam control valve is arranged on the top, and the steam pipeline extends to the middle and lower part of the external water heater and is connected with the steam disperser. The external water heater is designed to avoid the phenomenon of excessive temperature rise of the reaction liquid caused by too violent steam heating, thereby effectively avoiding the phenomenon of overflow and material flushing affecting the safe production.

[0011] Preferably, the steam disperser is composed of an annular pipeline made of stainless steel with a diameter of 40-50 mm, the diameter of the steam disperser is 1.0-1.5 m, and 100-200 circular holes with a diameter of 5 mm are arranged on the surface of the steam disperser.

[0012] Preferably, the liquid guide is made of 904 stainless steel or glass lining material, has a diameter of 300-500 mm and a height of 0.6-1.0 m, and the upper part of the liquid guide is connected with the synthesis reactor, and the lower part of the liquid guide is connected with the reaction liquid circulating pump.

[0013] Preferably, the tubular reactor is composed of 904 stainless steel serpentine pipe sections, has an extension length of 25-30 m, and the inner wall of the tubular reactor is welded with 10 mm protruding burrs, and the number of burrs is 20-30 per m.

[0014] Preferably, the external heat exchanger is composed of two shell-and-tube heat exchangers with a heat exchange area of 40-50 m 2 connected in parallel, and the total heat exchange area is 80-100 m 2 . The external heat exchanger is designed to realize separate heating and cooling operation, and to compensate for the small heat exchange area of the jacket of the synthesis reactor, which is beneficial to the temperature control of the oxidation reaction process.

[0015] Preferably, the utility model discloses a kind of glyoxylic acid synthesis reaction's combination device, it is characterized in that, the nitric acid disperser is that PTFE material pipeline combination is formed to the diameter 25~32mm, appearance is annular, and 100~150 circular holes with the diameter of 3~5mm are opened on surface.The purpose of designing nitric acid disperser is to make the dilute nitric acid that drops down quickly disperses, so it can effectively avoid local violent reaction, which is more advantageous to production safety and control by-product generation.

[0016] Preferably, the utility model discloses a kind of glyoxylic acid synthesis reaction's combination device, it is characterized in that, the tail gas absorption tower is provided with 6 levels, 1-4 level is water absorption tower, 5-6 level is alkali absorption tower, tail gas absorption tower diameter is 100~120cm, height is 10~12m, annular sprayer is provided at the top of tail gas absorption tower, 8~10 layers of packing module are loaded in tail gas absorption tower body, and the inside of packing module is corrugated packing.The purpose of setting 6 levels of tail gas absorption tower is to absorb nitrogen oxides in reaction tail gas sufficiently, which is very advantageous to resource recycling and environmental protection.

[0017] Preferably, the utility model discloses a kind of glyoxylic acid synthesis reaction's combination device, it is characterized in that, the inside of the absorption liquid tank is additionally installed by cooling water coil combination and is formed built-in heat exchanger, and the heat exchange area of built-in heat exchanger is 40~50m 2 The purpose of designing built-in heat exchanger is to reduce the temperature of absorption liquid in absorption liquid tank, and the lower temperature is more advantageous to tail gas absorption.

[0018] Preferably, the utility model discloses a kind of glyoxylic acid synthesis reaction's combination device, it is characterized in that, the anti-blocking inclined pipe is arranged at the bottom of tail gas absorption tower, and the included angle between anti-blocking inclined pipe and tail gas absorption tower is 30~60 °.The purpose of such design is to avoid that absorption liquid from top to bottom flows into tail gas pipeline and causes the blockage of tail gas absorption system, which is very beneficial to process safety.

[0019] The utility model discloses a kind of combination device of glyoxylic acid synthetic reaction, it brings obvious beneficial effect in the following 6 aspects, 1 set external water heater can effectively avoid temperature too high, convection process safety is very beneficial, simultaneously, condensation utilizes waste heat to reduce energy consumption is very beneficial;2 set the liquid guide of upper extraction reaction liquid can effectively avoid the safety risk caused by sudden leakage at the bottom of synthetic reaction kettle;3 gas-liquid mixing ejector and the cooperation of tubular reactor can effectively improve reaction efficiency and reduce the excessive generation of by-product;4 set external heat exchanger can effectively control the temperature in reaction process ups and downs, convection process safety and process stability are very beneficial;5 reaction tail gas enters tail gas absorption tower through anti-blocking inclined pipe, which can effectively avoid absorption liquid flowing into tail gas pipeline, and is beneficial to process safety;6 absorption liquid tank is provided with built-in heat exchanger, which can effectively prevent the temperature of absorption liquid from rising too fast, and is beneficial to the full absorption of reaction tail gas and environmental protection. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present utility model, and those skilled in the art can also obtain other drawings from these drawings.

[0021] Figure 1 It is a kind of combination device of glyoxylic acid synthetic reaction described in the technical scheme of the present utility model.

[0022] Figure 1 In the middle: synthetic reaction kettle 01, external water heater 02, steam control valve 03, steam disperser 04, hot water circulating pump 05, jacket inlet 06, jacket return pipe 07, return port 71, liquid extraction pipe 08, online detection port 09, liquid guide 10, reaction liquid circulating pump 11, gas-liquid mixing ejector 12, air purifier 13, tubular reactor 14, external heat exchanger 15, nitric acid metering tank 16, nitric acid disperser 17, anti-entrainment damper 18, tail gas pipeline 19, reflux condenser 20, anti-blocking inclined pipe 21, absorption liquid tank 22, built-in heat exchanger 23, cooling water inlet 24, cooling water outlet 25, absorption liquid circulating pump 26, tail gas absorption tower 27, packing module 28, annular spray pipe 29, harmless tail gas outlet 30. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the present utility model more clear, the following will be described in combination with Figure 1 The embodiment of the present specific implementation is further described.

[0024] The combination device for the synthesis reaction of glyoxylic acid comprises a synthesis reactor 01, an external water heater 02, a steam control valve 03, a steam disperser 04, a hot water circulating pump 05, a jacket water inlet 06, a jacket water return pipe 07, a water return port 71, a liquid pumping pipe 08, an on-line detection port 09, a liquid guiding device 10, a reaction liquid circulating pump 11, a gas-liquid mixing injector 12, an air purifier 13, a tubular reactor 14, an external heat exchanger 15, a nitric acid metering tank 16, a nitric acid disperser 17, an anti-entrainment damper 18, a tail gas pipeline 19, a reflux condenser 20, an anti-blocking inclined pipe 21, an absorption liquid tank 22, an internal heat exchanger 23, a cooling water inlet 24, a cooling water outlet 25, an absorption liquid circulating pump 26, a tail gas absorption tower 27, a packing module 28, an annular spraying pipe 29, and a harmless tail gas outlet 30.

[0025] The combination device for the synthesis reaction of glyoxylic acid comprises a synthesis reactor 01, an external water heater 02, a steam control valve 03, a steam disperser 04, a hot water circulating pump 05, a jacket water inlet 06, a jacket water return pipe 07, a water return port 71, a liquid pumping pipe 08, an on-line detection port 09, a liquid guiding device 10, a reaction liquid circulating pump 11, a gas-liquid mixing injector 12, an air purifier 13, a tubular reactor 14, an external heat exchanger 15, a nitric acid metering tank 16, a nitric acid disperser 17, an anti-entrainment damper 18, a tail gas pipeline 19, a reflux condenser 20, an anti-blocking inclined pipe 21, an absorption liquid tank 22, an internal heat exchanger 23, a cooling water inlet 24, a cooling water outlet 25, an absorption liquid circulating pump 26, a tail gas absorption tower 27, a packing module 28, an annular spraying pipe 29, and a harmless tail gas outlet 30.

[0026] Further, the combination device for the synthesis reaction of glyoxylic acid comprises an external water heater, wherein the external water heater is a stainless steel tank with a diameter of 2.0 m and a volume of 8-10 m 3The steam control valve is arranged on the upper portion of the steam pipe, and the steam pipe extends to the middle and lower portion of the external water heater and is connected with the steam disperser. The external water heater is designed to avoid the excessive rapid temperature rise of the reaction liquid caused by the excessively fierce steam heating, thereby effectively avoiding the overflow and material flushing and other phenomena affecting the safe production. Since the reaction temperature required for the synthesis of glyoxylic acid is about 50°C, high-pressure steam is not required, and therefore, the external water heater can effectively utilize the waste heat of other processes, which is favorable for energy saving and consumption reduction.

[0027] Further, the combination device for the synthesis reaction of glyoxylic acid has the features that the steam disperser is composed of a ring-shaped pipe made of stainless steel with a diameter of 40-50 mm, the diameter of the steam disperser is 1.0-1.5 m, and 100-200 circular holes with a diameter of 5 mm are arranged on the surface of the steam disperser. The design is to fully utilize the steam and avoid noise during the steam heating.

[0028] Further, the combination device for the synthesis reaction of glyoxylic acid has the features that the liquid guide is made of 904 stainless steel or glass lining material, has a diameter of 300-500 mm and a height of 0.6-1.0 m, and the upper portion of the liquid guide is connected with the synthesis reaction kettle and the lower portion of the liquid guide is connected with the reaction liquid circulating pump. The design of the liquid guide is to implement the upward pumping of the reaction liquid, effectively avoid the leakage of the pumped reaction liquid from the bottom of the synthesis reaction kettle, and is favorable for the safety production, process safety and process control.

[0029] Further, the combination device for the synthesis reaction of glyoxylic acid has the features that the tubular reactor is composed of 904 stainless steel serpentine pipe segments, has an extension length of 25-30 m, and the inner wall of the tubular reactor is welded with 10 mm protruding burrs with a number of 20-30 per meter. The introduction of the tubular reactor into the synthesis process of glyoxylic acid is to utilize the forced mass transfer characteristics of the tubular reactor to promote the accelerated oxidation of glyoxal. Since the mass transfer area of the tubular reactor is large, the glyoxal will not be excessively oxidized in a short time, which is favorable for improving the production efficiency.

[0030] Further, the combination device for the synthesis reaction of glyoxylic acid has the features that the external heat exchanger is composed of two shell-and-tube heat exchangers with a heat exchange area of 40-50 m 2 connected in parallel, and the total heat exchange area is 80-100 m 2 . The design of the external heat exchanger is to realize the separate operation of heating and cooling, and to compensate for the small heat exchange area of the jacket of the synthesis reaction kettle, which is favorable for the temperature control of the oxidation reaction process.

[0031] Further, the combination device for the synthesis of glyoxylic acid according to the embodiment of the present specific implementation is characterized in that the nitric acid disperser is a PTFE pipe with a diameter of 25-32 mm, and the appearance is annular, and the surface is provided with 100-150 circular holes with a diameter of 3-5 mm. The purpose of designing the nitric acid disperser is to quickly disperse the diluted nitric acid dropped, so as to effectively avoid the local violent reaction, which is beneficial to the production safety and the control of byproduct generation.

[0032] Further, the combination device for the synthesis of glyoxylic acid according to the embodiment of the present specific implementation is characterized in that the tail gas absorption tower is provided with 6 stages, stages 1-4 are water absorption towers, and stages 5-6 are alkali absorption towers, the tail gas absorption tower has a diameter of 100-120 cm and a height of 10-12 m, the top of the tail gas absorption tower is provided with an annular sprayer, and the tail gas absorption tower is internally provided with 8-10 layers of packing modules, and the packing modules are internally provided with corrugated packing. The purpose of providing the tail gas absorption tower with 6 stages is to fully absorb the nitrogen oxides in the reaction tail gas, which is very beneficial to resource recycling and environmental protection.

[0033] Further, the combination device for the synthesis of glyoxylic acid according to the embodiment of the present specific implementation is characterized in that the absorption liquid tank is internally provided with an internal heat exchanger composed of cooling water coils, and the heat exchange area of the internal heat exchanger is 40-50 m 2 The purpose of designing the internal heat exchanger is to reduce the temperature of the absorption liquid in the absorption liquid tank, and the lower the temperature, the more beneficial to the tail gas absorption.

[0034] Further, the combination device for the synthesis of glyoxylic acid according to the embodiment of the present specific implementation is characterized in that the anti-blocking inclined pipe is arranged at the bottom of the tail gas absorption tower, and the included angle between the anti-blocking inclined pipe and the tail gas absorption tower is 30-60°. The purpose of such design is to avoid the absorption liquid flowing from top to bottom into the tail gas pipeline to cause the blockage of the tail gas absorption system, which is very beneficial to the process safety.

[0035] Furthermore, the combined apparatus for the glyoxylic acid synthesis reaction described in this specific embodiment has the following simple operating procedure: First, add the reaction raw materials to the synthesis reactor 01 according to the proportion, fill the liquid inlet 10 with pure water or reaction mixture, control the water temperature in the external water heater to 60-70°C, then start the reaction liquid circulation pump 11, so that the reaction mixture enters the synthesis reactor 01 sequentially through the gas-liquid mixing injector 12, the tubular reactor 14 and the external heat exchanger 15, and start the hot water circulation pump 05 to control the temperature inside the synthesis reactor 01 to reach the process requirements, then... Nitric acid is dripped from the metering tank 16 down through the nitric acid disperser 17 into the synthesis reactor 01. At the same time, the 1-6 stage tail gas absorption towers are started. The reaction tail gas enters the tail gas absorption tower 27 sequentially through the tail gas pipe 19, the anti-entrainment damper 18, the reflux condenser 20, the tail gas pipe 19, and the anti-blocking inclined pipe 21. It comes into contact with the absorption liquid from top to bottom for reaction and absorption. After the reaction tail gas undergoes 6 stages of absorption treatment, the harmless gas enters the next process from the harmless tail gas outlet. During the glyoxylic acid synthesis reaction, the reaction is stopped when the glyoxylic acid content and impurity content reach the process standard as seen from the online detection port.

[0036] The combined apparatus for the glyoxylic acid synthesis reaction described in this utility model has significant beneficial effects in the following six aspects: 1. The external water heater effectively avoids excessive temperature, which is very beneficial to process safety. At the same time, the utilization of waste heat during condensation is very beneficial to reducing energy consumption. 2. The liquid priming device for pumping the reaction liquid upwards effectively avoids the safety risks caused by sudden leakage at the bottom of the synthesis reactor. 3. The combination of the gas-liquid mixing injector and the tubular reactor effectively improves reaction efficiency and reduces excessive generation of by-products. 4. The external heat exchanger effectively controls large temperature fluctuations during the reaction process, which is very beneficial to process safety and process stability. 5. The reaction tail gas enters the tail gas absorption tower through the anti-clogging inclined pipe, which effectively prevents the absorbent liquid from flowing into the tail gas pipeline, which is beneficial to process safety. 6. The internal heat exchanger in the absorbent tank effectively prevents the absorbent liquid temperature from rising too quickly, which is very beneficial to the full absorption of the reaction tail gas and is beneficial to environmental protection.

[0037] This device, the combined apparatus for the glyoxylic acid synthesis reaction described in this utility model, also features process safety, high reaction efficiency, and convenient operation.

[0038] Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model shall be included within the protection scope of this utility model. The protection scope of this utility model shall conform to the widest range consistent with the principles and novel features described herein.

Claims

1. A combined apparatus for the synthesis reaction of glyoxylic acid, comprising: The system comprises a synthesis reactor, an external water heater, a steam control valve, a steam disperser, a hot water circulation pump, a jacketed inlet, a jacketed return pipe, a return outlet, a liquid priming device, a liquid extraction pipe, a reaction liquid circulation pump, a gas-liquid mixing ejector, an air purifier, a tubular reactor, an external heat exchanger, a nitric acid metering tank, a nitric acid disperser, a tail gas pipeline, an anti-entrainment damper, a reflux condenser, an anti-clogging inclined pipe, an absorbent tank, an internal heat exchanger, a tail gas absorption tower, a packing module, an annular spray pipe, and a harmless tail gas outlet. The synthesis reactor is characterized in that both sides are connected to the external water heater via the jacketed inlet and jacketed return pipe. One end of the liquid priming device is connected to the upper part of the synthesis reactor via a pipe and extends to the lower part of the synthesis reactor via a liquid extraction pipe. The liquid priming device is connected to the gas-liquid mixing ejector via the reaction liquid circulation pump. The gas-liquid mixing injector is connected to an air purifier on its side. The gas-liquid mixing injector is connected forward to a tubular reactor via a pipe. The tubular reactor is connected forward to an external heat exchanger. The external heat exchanger is connected downward to the upper part of the synthesis reactor and extends into the synthesis reactor via a pipe. The lower part of the nitric acid metering tank is connected to the upper part of the synthesis reactor via a pipe and extends into the synthesis reactor to connect to a nitric acid disperser. The anti-entrainment damper is installed on the tail gas pipe at the upper part of the synthesis reactor, connecting downward to the synthesis reactor and upward to a reflux condenser. The reflux condenser is connected forward along the tail gas pipe to the bottom of the tail gas absorption tower via an anti-clogging inclined pipe. The tail gas absorption tower is located directly above the absorption liquid tank.

2. The combined apparatus for the glyoxylic acid synthesis reaction according to claim 1, characterized in that, The main body of the external water heater is a stainless steel tank with a diameter of 2.0m and a volume of 8-10m³. 3 It is equipped with a steam control valve, and the steam pipe extends to the lower middle part of the external water heater and connects to the steam diffuser.

3. The combined apparatus for the glyoxylic acid synthesis reaction according to claim 1, characterized in that, The steam disperser consists of a stainless steel annular pipe with a diameter of 40-50 mm. The diameter of the steam disperser is 1.0-1.5 m, and the surface of the steam disperser has 100-200 circular holes with a diameter of 5 mm.

4. The combined apparatus for the glyoxylic acid synthesis reaction according to claim 1, characterized in that, The liquid initiator is made of 904 stainless steel or glass-lined material, with a diameter of 300-500 mm and a height of 0.6-1.0 m. The upper part of the liquid initiator is connected to the synthesis reactor, and the lower part of the liquid initiator is connected to the reaction liquid circulation pump.

5. The combined apparatus for the glyoxylic acid synthesis reaction according to claim 1, characterized in that, The tubular reactor is composed of serpentine tube sections made of 904 stainless steel, with an extension length of 25-30m. The inner wall of the tubular reactor is welded with 10mm protrusions, and the number of burrs is 20-30 per m.

6. The combined apparatus for the glyoxylic acid synthesis reaction according to claim 1, characterized in that, The external heat exchanger consists of two heat exchangers with a heat exchange area of ​​40-50 m². 2 The shell-and-tube heat exchangers are connected in parallel, with a total heat exchange area of ​​80–100 m². 2 .

7. The combined apparatus for the glyoxylic acid synthesis reaction according to claim 1, characterized in that, The nitric acid disperser is composed of PTFE pipes with a diameter of 25-32mm, and has a ring-shaped appearance with 100-150 round holes with a diameter of 3-5mm on the surface.

8. The combined apparatus for the glyoxylic acid synthesis reaction according to claim 1, characterized in that, The tail gas absorption tower is configured with 6 stages, with stages 1-4 being water absorption towers and stages 5-6 being alkali absorption towers. The tail gas absorption tower has a diameter of 100-120cm and a height of 10-12m. A ring sprayer is installed at the top of the tail gas absorption tower. The tower body is filled with 8-10 layers of packing modules, and the packing modules are filled with corrugated packing.

9. The combined apparatus for the glyoxylic acid synthesis reaction according to claim 1, characterized in that, The absorbent tank is equipped with an internal heat exchanger consisting of cooling water coils, with a heat exchange area of ​​40-50 m². 2 .

10. The combined apparatus for the glyoxylic acid synthesis reaction according to claim 1, characterized in that, The anti-clogging inclined tube is installed at the bottom of the tail gas absorption tower, and the angle between the anti-clogging inclined tube and the tail gas absorption tower is 30-60°.

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