Comprehensive treatment device and process for acidic and alkaline tail gas in glyphosate production process

Abstract

The invention provides a comprehensive treatment device and process for acidic and alkaline tail gas in a glyphosate production process. An acidic tail gas buffer tank is connected with a hydrochloric acid absorption tower through an acidic tail gas fan, and the hydrochloric acid absorption tower is connected with an alkali absorption tower; the alkaline tail gas buffer tank is connected with an alkaline absorption tower through an alkaline tail gas fan; the alkali absorption tower is connected with the water absorption tower, the water washing tower is connected with the emptying buffer tank, and the emptying buffer tank is connected with the emptying fan. Acid vented tail gas and alkaline vented tail gas are used for neutralization, a gas phase and liquid phase combined neutralization mode is adopted, facilities such as a tail gas buffer tank and a variable-frequency tail gas fan are additionally arranged, automatic control interlocking devices such as pressure monitoring, pH value feedback and automatic circulating liquid extraction are additionally arranged, and the absorption liquid amount and the system pressure of the vented system are accurately and flexibly vented; production is stable, environmental protection pressure is reduced, and water consumption is saved.

Description

Technical Field

[0001] The invention relates to the field of glyphosate production, and in particular to a comprehensive treatment device and process for acidic and alkaline tail gas in the glyphosate production process. Background Art

[0002] At present, the glyphosate production route still adopts the "glycine-dimethyl phosphite" method, with triethylamine as a catalyst, polyformaldehyde is depolymerized in the solvent methanol to form hemiacetal, which is further reacted with glycine and then esterified with dimethyl phosphite. The synthetic liquid is then mixed with hydrochloric acid, acidolyzed, desolventized, deacidified, crystallized, separated, and dried to obtain solid glyphosate. The dried and separated mother liquor is recovered through a triethylamine recovery device.

[0003] During production, acid addition will produce acidic tail gas, and triethylamine recovery will produce alkaline gas. Usually, both acidic tail gas and alkaline tail gas are absorbed by water absorption towers, and then discharged after two-stage absorption. This treatment route has the following disadvantages: first, the number of discharge ports is not easy to control, because the acid tail gas absorption tower and the alkaline tail gas absorption tower are discharged separately, which increases the cost and risk of environmental protection; second, the circulating spray liquid of the absorption tower is not conducive to recycling. Summary of the invention

[0004] The main purpose of the present invention is to provide a comprehensive treatment device and process for acidic and alkaline tail gas in the glyphosate production process, so as to solve the problems of a large number of discharge outlets, high environmental protection management costs and risks, and the difficulty in recycling circulating liquid.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a comprehensive treatment device for acidic tail gas and alkaline tail gas in the glyphosate production process, the acidic tail gas buffer tank is connected to the hydrochloric acid absorption tower through the acid tail gas fan, and the hydrochloric acid absorption tower is connected to the alkali absorption tower; The alkaline tail gas buffer tank is connected to the alkali absorption tower via the alkali tail gas fan; The alkali absorption tower is connected to the water absorption tower, the water washing tower is connected to the venting buffer tank, and the venting buffer tank is connected to the venting fan.

[0006] The acid tail gas fan, alkali tail gas fan and vent fan are all variable frequency tail gas fans.

[0007] The comprehensive processing device also includes a connection structure of the following devices: The synthesis kettle is connected to the acid adding mixer, the hydrochloric acid metering tank is connected to the acid adding mixer, the acid adding mixer is connected to the acid adding kettle, the acid adding kettle is connected to the mixed liquid condenser, the acid adding kettle is connected to the acid adding liquid storage tank, and the acid adding liquid storage tank is connected to the storage tank venting condenser.

[0008] The comprehensive processing device also includes a connection structure of the following devices: The mother liquor settling tank is connected to the triethylamine mixer, the triethylamine mixer is connected to the alkali tank, the triethylamine mixer is connected to the triethylamine layering tank, the overflow port of the triethylamine layering tank is connected to the dehydration kettle, the exhaust port of the triethylamine layering tank is connected to the mother liquor tank after neutralization, the bottom of the triethylamine dehydration kettle is connected to the triethylamine standing tank, the exhaust port of the triethylamine dehydration kettle is connected to the alkali separation tank, the triethylamine standing tank is connected to the triethylamine finished product tank, the triethylamine finished product tank is connected to the finished product tank venting condenser, the mother liquor tank after neutralization is connected to the reboiler of the triethylamine distillation tower, the reboiler of the distillation tower is connected to the triethylamine distillation tower, and the triethylamine distillation tower is connected to the venting condenser.

[0009] The hydrochloric acid metering tank, the acid adding kettle and the top of the acid adding solution storage tank are respectively connected to the acid tail gas buffer tank via a vent pipe.

[0010] The mother liquor sedimentation tank, triethylamine layering tank, triethylamine static tank, triethylamine dehydration kettle, alkali separation tank, post-neutralization mother liquor tank, and finished product tank venting condenser are all connected to the alkaline tail gas buffer tank.

[0011] As described above, the synthetic liquid in the synthesis reactor is transported by a pump and mixed with the hydrochloric acid in the hydrochloric acid metering tank through a mixer to perform acid hydrolysis; The mixed liquid condenser uses frozen brine as a refrigerant to circulate and cool the acid solution; The acid tail gas buffer tank is used as a buffer tank for acid venting gas, and the acid liquid is discharged into the acid adding kettle; As described above, the acid tail gas fan adopts frequency conversion control technology to balance the pressure of the acid tail gas absorption tower venting pipeline; The triethylamine finished product tank vent condenser uses frozen brine as the refrigerant; The triethylamine distillation tower uses steam for distillation, and the distillation tower vent condenser uses ice water and frozen brine as the refrigerant; The alkaline tail gas buffer tank is used as a buffer tank for alkaline venting gas, and the alkaline liquid is discharged into the alkali tank; As described above, the alkali tail gas fan adopts frequency conversion control technology to balance the pressure of the alkali tail gas absorption tower venting pipeline; As mentioned above, the venting fan adopts variable frequency control technology to balance the pressure of the entire venting system; As a preferred embodiment, the water scrubber uses tap water as the absorber water, the acid tail gas absorber uses the water scrubber washing water, and the water is extracted to the alkali tail gas absorber by a circulating pump as the absorption liquid of the alkali absorber; Preferably, the absorbent in the alkali tail gas absorber is converted into salt water and taken out to the salt treatment process; Preferably, the alkali tail gas tower and the acid tail gas tower are provided with safety control systems such as emergency shut-off, pressure monitoring, high and low liquid level alarm interlocking, etc.

[0012] In view of the above device, the present invention also provides a comprehensive treatment method for acidic tail gas and alkaline tail gas, comprising the following steps: (1) The acidic tail gas containing hydrochloric acid in the acidic tail gas buffer tank is pumped to the hydrochloric acid absorption tower through the acidic tail gas fan. After absorbing the hydrochloric acid, the remaining tail gas is sent to the alkali absorption tower; (2) The alkaline tail gas containing triethylamine in the alkaline tail gas buffer tank is sent to the alkali absorption tower through the alkaline tail gas blower; (3) After the acidic tail gas and alkaline tail gas in steps (1) and (2) are absorbed and balanced, they are sent to the salt treatment device, and the remaining tail gas that has not been completely absorbed is sent to the water absorption tower for absorption, and the remaining tail gas is discharged.

[0013] The physicochemical properties of the acidic tail gas containing hydrochloric acid in step (1) are as follows: appearance and properties: colorless or slightly yellow fuming liquid, with a pungent sour smell, pH value: 0.1 (1 mol / L), relative density (water = 1): 1.1 (20%), (other characteristics are omitted because they are not related to this); the content of hydrochloric acid gas in the tail gas accounts for more than 90%, the pH value is about 3-4 when monitored online, and there is about 10% formaldehyde gas and a small amount of white crystalline powder impurities; the physicochemical properties of the alkaline tail gas containing triethylamine in step (2) are as follows: because the triethylamine gas in the tail gas is repeatedly washed and absorbed by the circulating liquid, its proportion is only about 1-2%.

[0014] Those skilled in the art know that concentrated hydrochloric acid (HCl) is volatile and has a pungent odor. Hydrochloric acid is an aqueous solution of hydrogen chloride, and its pH value depends on the concentration of the hydrochloric acid solution. Generally speaking, at 25°C, the pH of a commonly used 0.1 mol / L hydrochloric acid solution is 1.

[0015] Triethylamine is a volatile organic compound, slightly soluble in water. At 20°C, its solubility in water is about 133g / L. Its aqueous solution is weakly alkaline. At 25°C, the pKa (acidity coefficient) of triethylamine is 10.75, and the pH value of a saturated aqueous solution of triethylamine is about 11.9 (the data is a calculated value).

[0016] In this application, the volatilization process of acidic gas, the volatilization amount is from large to small, and the size of pH is also a dynamic value, which is difficult to handle. This technology uses facilities such as variable frequency exhaust fans, and adds automatic control interlocking devices such as pressure monitoring and pH meter feedback values, which can stably control the neutralization effect of acidic and alkaline exhaust gases. For example: when the amount of acidic exhaust gas generated is large, the acid exhaust fan needs to run at a higher frequency to quickly extract the gas and maintain the required negative pressure range. When the pH meter in the exhaust absorption device detects that the pH value is low, it will dynamically interlock the frequency modulation of the alkaline exhaust fan to increase the extraction of alkaline gas for neutralization within a certain negative pressure range.

[0017] In this application, the operating frequency of the acid tail gas fan and the alkali tail gas fan is usually determined according to multiple factors, mainly dynamically adjusted according to the automatic interlocking device, and the frequency is maintained between 30 Hz and 60 Hz. Make the slight negative pressure in the acid tail gas buffer tank -3kpa to -5kpa; The operating frequency of the alkaline tail gas fan is between 30 Hz and 60 Hz, so that the slight negative pressure in the alkaline tail gas buffer tank is -3 kPa to -5 kPa.

[0018] By adjusting the above-mentioned tail gas operation conditions, the pH in the alkali absorption tower is set to 4.5-5.0.

[0019] The beneficial effects of the present invention are: By neutralizing acidic and alkaline exhaust gases, a gas-liquid combination neutralization method is adopted, and facilities such as exhaust buffer tanks and variable frequency exhaust fans are added. Corresponding automatic control interlocking devices such as pressure monitoring, pH value feedback, and automatic extraction of circulating liquid are added to accurately and flexibly control the amount of absorbed liquid and system pressure of the exhaust system, stabilize production, reduce environmental pressure, and save water consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a schematic diagram of a comprehensive treatment process for acidic and alkaline tail gas in the production process of glyphosate, wherein: a synthesis reactor 1, an acid adding mixer 2, a hydrochloric acid metering tank 3, an acid adding reactor 4, a mixed liquid condenser 5, an acid adding liquid storage tank 6, a storage tank venting condenser 7, an acid tail gas buffer tank 8, an acid tail gas fan 9, a hydrochloric acid absorption tower 10, an alkali absorption tower 11, a mother liquor settling tank 12, a triethylamine mixer 13, an alkali tank 14, a triethylamine layering tank 15, a dehydration reactor 16, a mother liquor tank after neutralization 17, a triethylamine standing tank 18, a triethylamine standing tank pressure pump 19, an alkali separation tank 20, a triethylamine finished product tank 21, a finished product tank venting condenser 22, a triethylamine distillation tower reboiler 23, a triethylamine distillation tower 24, a venting condenser 25, a tail gas buffer tank connected to 26, an alkali tail gas fan 27, an alkali absorption tower 11, a water absorption tower 28, a venting buffer tank 29, and a venting fan 30. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] Example 1 The comprehensive treatment device for acidic and alkaline tail gas in the glyphosate production process includes: 1. The synthesis reactor 1 is connected to the acid adding mixer 2, the hydrochloric acid metering tank 3 is connected to the acid adding mixer 2, the acid adding mixer 2 is connected to the acid adding reactor 4, the acid adding reactor 4 is connected to the mixed liquid condenser 5, the acid adding reactor 4 is connected to the acid adding solution storage tank 6, and the acid adding solution storage tank 6 is connected to the storage tank venting condenser 7.

[0023] 2. The mother liquor settling tank 12 is connected to the triethylamine mixer 13, the triethylamine mixer 13 is connected to the alkali tank 14, the triethylamine mixer 13 is connected to the triethylamine layering tank 15, the overflow port of the triethylamine layering tank 15 is connected to the dehydration kettle 16, the triethylamine layering tank 15 exhaust port is connected to the mother liquor tank 17 after neutralization, the supernatant of the triethylamine dehydration kettle 16 is connected to the triethylamine standing tank 18, the triethylamine dehydration kettle 16 exhaust port is connected to the alkali separation tank 20, the triethylamine standing tank 18 is connected to the triethylamine finished product tank 21, the triethylamine finished product tank 21 is connected to the finished product tank vent condenser 22, the mother liquor tank 17 after neutralization is connected to the triethylamine distillation tower reboiler 23, the distillation tower reboiler 23 is connected to the triethylamine distillation tower 24, and the triethylamine distillation tower 24 is connected to the vent condenser 25.

[0024] The tops of the hydrochloric acid metering tank 3, the acid adding kettle 4, and the acid adding solution storage tank 6 are respectively connected to the acid tail gas buffer tank 8 through a vent pipe, the acid tail gas buffer tank 8 is connected to the acid tail gas fan 9, the acid tail gas fan 9 is connected to the hydrochloric acid absorption tower 10, and the hydrochloric acid absorption tower 10 is connected to the alkali absorption tower 11.

[0025] The mother liquor sedimentation tank 12, triethylamine stratification tank 15, triethylamine static tank 18, dehydration kettle 16, alkali separation tank 20, neutralization mother liquor tank 17, and finished product tank vent condenser 22 are all connected to the alkaline tail gas buffer tank 26, the alkaline tail gas buffer tank 26 is connected to the alkaline tail gas fan 27, the alkaline tail gas fan 27 is connected to the alkali absorption tower 11, the alkali absorption tower 11 is connected to the water absorption tower 28, the water washing tower 28 is connected to the venting buffer tank 29, and the venting buffer tank 29 is connected to the venting fan 30.

[0026] As described above, the synthetic liquid in the synthesis reactor 1 is transported by a pump and mixed with the hydrochloric acid in the hydrochloric acid metering tank 3 through a mixer to perform acid hydrolysis; As described above, the mixed liquid condenser 2 uses frozen brine as a refrigerant to circulate and cool the acid solution; The acid tail gas buffer tank 8 is used as a buffer tank for acid venting gas, and the acid liquid is discharged into the acid adding kettle 4; As described above, the acid tail gas blower 9 uses frequency conversion control technology to balance the pressure of the vent pipe of the acid tail gas absorption tower 10; As described above, the triethylamine finished tank vent condenser 22 uses frozen brine as the refrigerant; As described above, the triethylamine distillation tower 24 uses steam for distillation, and the distillation tower vent condenser 25 uses ice water and frozen brine as a refrigerant; The alkaline tail gas buffer tank 26 is used as a buffer tank for alkaline venting gas, and the alkaline liquid is discharged into the alkali tank 14; As described above, the alkali tail gas fan 27 uses frequency conversion control technology to balance the pressure of the alkali tail gas absorption tower venting pipeline; As mentioned above, the venting fan 29 uses variable frequency control technology to balance the pressure of the entire venting system; Preferably, the water scrubber uses tap water as absorber makeup water, the acid tail gas absorber uses water scrubber wash water, and the water is pumped out to the alkali tail gas absorber by a circulating pump as the absorbent of the alkali absorber.

[0027] Preferably, the absorbent in the alkali tail gas absorber is converted into salt water and taken out to the salt treatment process; Preferably, the alkali tail gas tower and the acid tail gas tower are provided with safety control systems such as emergency shut-off, pressure monitoring, high and low liquid level alarm interlocking, etc.

[0028] Example 2 like Figure 1 As shown, in the glyphosate production process of this embodiment, the comprehensive treatment process of the basic tail gas and the acid tail gas of the condenser of the triethylamine recovery system, the condenser of the acid adding kettle in the synthesis step, and the condenser of the hydrochloric acid header tank is as follows: (1) The material in the glyphosate synthesis reactor 1 is added with hydrochloric acid in the hydrochloric acid metering tank 3 and then sent to the acid adding mixer 2. After being evenly mixed, it is sent to the acid adding reactor 4. The material in the acid adding reactor 4 is condensed and sent to the acid adding liquid storage tank 6. The material in the acid adding liquid storage tank 6 is condensed and sent to the acid tail gas buffer tank 8. The gas phase in the acid adding reactor 4 also enters the acid tail gas buffer tank 8. The gas phase in the hydrochloric acid metering tank 3 also enters the acid tail gas buffer tank 8. (2) After adding alkali, the materials in the mother liquor settling tank 12 are mixed in the triethylamine mixer 13 and then sent to the triethylamine layering tank 15. After layering, the materials at the bottom of the triethylamine layering tank 15 are sent to the neutralized mother liquor tank 17. After the neutralized mother liquor tank 17 is distilled and condensed, it is sent to the alkaline tail gas buffer tank 26; the materials in the upper part of the triethylamine layering tank 15 are sent to the dehydration kettle 16 for dehydration. After dehydration, the materials at the bottom of the dehydration kettle 16 are sent to the alkali separation tank 20, and the materials at the lower part are sent to the triethylamine standing tank 18. After the materials in the triethylamine standing tank 18 are left to stand, the bottom is sent to the triethylamine finished product tank 21; the gas phases at the top of the triethylamine layering tank 15, the dehydration kettle 16, the neutralized mother liquor tank 17, the alkali separation tank 20, the triethylamine finished product tank 21, and the mother liquor settling tank 12 are respectively sent to the alkaline tail gas buffer tank 26 through pipelines; (3) The acidic tail gas containing hydrochloric acid in the acidic tail gas buffer tank 8 is pumped to the hydrochloric acid absorption tower 10 through the acidic tail gas blower, and the remaining tail gas is sent to the alkali absorption tower 11 after absorbing the hydrochloric acid; (4) The alkaline tail gas containing triethylamine in the alkaline tail gas buffer tank 26 is sent to the alkali absorption tower 11 through the alkaline tail gas blower; (5) The acidic and alkaline tail gas are sent to the salt treatment device after absorption balance, and the remaining tail gas that has not been completely absorbed is sent to the water absorption tower for absorption, and the remaining tail gas is discharged.

[0029] The physical and chemical properties of the acidic tail gas containing hydrochloric acid are as follows: the hydrochloric acid gas content accounts for 93.5%, the pH value is monitored online to be about 3.6, there are about 11.4% formaldehyde gas and a small amount of white crystalline powder impurities; the operating frequency of the acid tail gas fan 9 is maintained at a fluctuation adjustment between 45 Hz and 50 Hz, so that the slight negative pressure in the acid tail gas buffer tank 8 is -3 kpa to -5 kpa; The physicochemical properties of the alkaline tail gas containing triethylamine are as follows: because the triethylamine gas in the tail gas is repeatedly washed and absorbed by the circulating liquid, its proportion is only 1.6%, and the operating frequency of the alkaline tail gas fan 27 is between 45 Hz and 50 Hz, so that the slight negative pressure in the alkaline tail gas buffer tank 26 is -3 kPa to -5 kPa.

[0030] Through the above adjustment, the pH in the alkali absorption tower 11 is 4.5-4.8. The acid-base tail gas neutralization carried out by this method will eventually produce triethylamine hydrochloride in the tail gas absorption device, and the final overflow gas detection VOC, ammonia emission concentration is less than 5ppm, and hydrogen chloride concentration is less than 10ppm, the emission is qualified, and there is no odor.

[0031] During normal testing, the pH in the alkaline absorption tower 11 is greater than 5. For example, when it is 5.5, the VOC and ammonia emission concentrations in the tail gas exceed the standard (exceeding the standard stipulated by environmental management regulations), a strong ammonia odor will exist on site, and smoke will overflow when the tail gas tower is vented.

[0032] In the solution of the present application, the operating frequency of the acid tail gas blower 9 is kept at a fluctuation adjustment between 60 Hz and 70 Hz, and the pH in the alkali absorption tower 11 fluctuates between 4.1 and 4.5, and the concentration of hydrogen chloride in the discharged tail gas is often between 50 and 85 ppm.

[0033] In the solution of the present application, the operating frequency of the alkali tail gas fan 27 is adjusted between 60 Hz and 70 Hz, and the pH in the alkali absorption tower 11 fluctuates between 5.2 and 5.5, so the ammonia emission concentration in the exhaust gas is often between 45 and 65 ppm.

[0034] At present, the terminal exhaust gas in the glyphosate production process is usually divided into two categories: one is acidic exhaust gas, which is treated by an acid exhaust gas absorption tower device, equipped with a circulating pump to spray the liquid phase on the top of the tower for neutralization before discharge, and the discharge port is separate; the other is alkaline gas, which is treated by an alkaline exhaust gas absorption tower device, equipped with a circulating pump to spray the liquid phase on the top of the tower for neutralization before discharge, and the discharge port is separate.

[0035] Obviously, the traditional tail gas treatment route: first, the number of discharge outlets is not easy to control, because the acid tail gas absorption tower and the alkali tail gas absorption tower are discharged separately, which increases the environmental protection cost and risk; second, the circulating spray liquid of the absorption tower is not conducive to recycling; This case involves the research and application of a device for treating terminal tail gas in the glyphosate production process. By effectively connecting the vent pipe of the alkali tail gas absorber tower with the air inlet pipe of the acid tail gas absorber tower, the tail gas fan adopts variable frequency control technology to balance the pressure of the vent pipe of the alkali tail gas absorber tower, ensuring that the exhaust gas of the alkali tail gas absorber tower enters the acid tail gas absorber tower and undergoes gas phase neutralization reaction with the acid gas of the acid tail gas absorber tower. The new process of gas phase neutralization of alkaline gas and acid gas is used to improve the traditional liquid phase circulation neutralization capacity, reduce the discharge port of glyphosate terminal tail gas treatment, and the acid gas tail gas absorber spray circulating liquid is recycled by the alkali tail gas absorber. When the absorption liquid concentration is saturated, it is transported to the triethylamine system through the circulating liquid extraction pump to recover part of the triethylamine, further reducing the production cost. This invention belongs to the technical field of glyphosate production process method.

[0036] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A comprehensive treatment device for acidic and alkaline tail gas in the glyphosate production process, characterized in that: The acid tail gas buffer tank (8) is connected to the hydrochloric acid absorption tower (10) via the acid tail gas fan (9), and the hydrochloric acid absorption tower (10) is connected to the alkali absorption tower (11); The alkaline tail gas buffer tank (26) is connected to the alkali absorption tower (11) via the alkali tail gas fan (27); The alkali absorption tower (11) is connected to the water absorption tower (28), the water washing tower (28) is connected to the venting buffer tank (29), and the venting buffer tank (29) is connected to the venting fan (30).

2. The comprehensive treatment device for acidic and alkaline tail gas in the glyphosate production process according to claim 1 is characterized in that: The acid tail gas fan (9), the alkali tail gas fan (27), and the vent fan (30) are all variable frequency tail gas fans.

3. The comprehensive treatment device for acidic and alkaline tail gas in the glyphosate production process according to claim 2, characterized in that: The comprehensive processing device also includes a connection structure of the following devices: The synthesis kettle (1) is connected to the acid adding mixer (2), the hydrochloric acid metering tank (3) is connected to the acid adding mixer (2), the acid adding mixer (2) is connected to the acid adding kettle (4), the acid adding kettle (4) is connected to the mixed liquid condenser (5), the acid adding kettle (4) is connected to the acid adding liquid storage tank (6), and the acid adding liquid storage tank (6) is connected to the storage tank venting condenser (7).

4. The comprehensive treatment device for acidic and alkaline tail gas in the glyphosate production process according to claim 3, characterized in that: The comprehensive processing device also includes a connection structure of the following devices: The mother liquor settling tank (12) is respectively connected to the triethylamine mixer (13) and the alkali tank (14); The triethylamine mixer (13) is connected to the triethylamine layering tank (15), the overflow port of the triethylamine layering tank (15) is connected to the dehydration kettle (16), and the alkali tank (14) is connected to the alkali separation tank (20); The exhaust port of the triethylamine layering tank (15) is connected to the post-neutralization mother liquor tank (17); the bottom of the triethylamine dehydration kettle (16) is connected to the triethylamine static tank (18); the exhaust port of the triethylamine dehydration kettle (16) is connected to the alkali separation tank (20); the triethylamine static tank (18) is connected to the triethylamine finished product tank (21); the triethylamine finished product tank (21) is connected to the finished product tank vent condenser (22); the post-neutralization mother liquor tank (17) is connected to the triethylamine distillation tower reboiler (23); the distillation tower reboiler (23) is connected to the triethylamine distillation tower (24); the triethylamine distillation tower (24) is connected to the vent condenser (25).

5. The comprehensive treatment device for acidic and alkaline tail gas in the glyphosate production process according to claim 3, characterized in that: The tops of the hydrochloric acid metering tank (3), the acid adding kettle (4), and the acid adding solution storage tank (6) are respectively connected to the acid tail gas buffer tank (8) via vent pipes.

6. The comprehensive treatment device for acidic and alkaline tail gas in the glyphosate production process according to claim 4, characterized in that: The mother liquor settling tank (12), triethylamine layering tank (15), triethylamine dehydration kettle (16), triethylamine static tank (18), alkali separation tank (20), post-neutralization mother liquor tank (17), and finished product tank vent condenser (22) are all connected to the alkaline tail gas buffer tank (26).

7. A method for comprehensive treatment of acidic tail gas and alkaline tail gas in the glyphosate production process, using the device according to any one of claims 1 to 6, characterized in that: The steps include: (1) The acidic tail gas containing hydrochloric acid in the acidic tail gas buffer tank (8) is pumped to the hydrochloric acid absorption tower (10) through the acidic tail gas blower (9), and the remaining tail gas is sent to the alkali absorption tower (11) after absorbing the hydrochloric acid; (2) The alkaline tail gas containing triethylamine in the alkaline tail gas buffer tank (26) is sent to the alkali absorption tower (11) via the alkaline tail gas blower (27); (3) After the acidic tail gas and alkaline tail gas in steps (1) and (2) are absorbed and balanced, they are sent to the salt treatment device, and the remaining tail gas that has not been completely absorbed is sent to the water absorption tower (28) for absorption, and the remaining tail gas is discharged.

8. The method for comprehensive treatment of acidic tail gas and alkaline tail gas in the glyphosate production process according to claim 7, characterized in that: The physical and chemical properties of the acidic tail gas containing hydrochloric acid in step (1) are as follows: the content of hydrochloric acid gas in the tail gas accounts for more than 90%, the pH value is 3-4 when monitored online, and there are 8-12% formaldehyde gas and a small amount of white crystalline powder impurities; The triethylamine content in the alkaline tail gas containing triethylamine in step (2) is only 1-2% due to repeated washing and absorption by the circulating liquid.

9. The method for comprehensive treatment of acidic tail gas and alkaline tail gas in the glyphosate production process according to claim 8, characterized in that: The acid tail gas fan (9) operates at a frequency of 30 Hz to 60 Hz, so that the slight negative pressure in the acid tail gas buffer tank (8) is -3 kPa to -5 kPa; The operating frequency of the alkaline tail gas fan (27) is 30 Hz to 60 Hz, so that the slight negative pressure in the alkaline tail gas buffer tank (26) is -3 kPa to -5 kPa.

10. The method for comprehensive treatment of acidic tail gas and alkaline tail gas in the glyphosate production process according to claim 8, characterized in that: The pH in the alkali absorption tower (11) is 4.5-5.0.

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