A treatment system and process for sodium methoxide solid waste

Abstract

The present invention discloses a treatment system and treatment process for sodium methoxide solid waste, which belongs to the field of hazardous waste treatment technology. The system comprises a hydrolysis reactor, an oxidation reactor, a neutralization reactor and a solid-liquid separator connected in sequence; the hydrolysis reactor is connected to an inert gas tank; the oxidation reactor is connected to an ozone generator and a chlorine dioxide generator; the neutralization reactor is connected to a manganese chloride solution storage tank and a sodium hydroxide solution storage tank; the hydrolysis reactor, the oxidation reactor and the neutralization reactor are all connected to an exhaust gas treatment system. The sodium methoxide solid waste treatment process of the present invention can achieve complete and safe disposal of sodium methoxide solid waste, and effectively collects and treats the three wastes of the system throughout the reaction process. At the same time, the sodium methoxide solid waste treatment system of the present invention is built based on the above-mentioned treatment process. Ultimately, the present invention aims to achieve safe disposal of sodium methoxide solid waste while ensuring the safety of the operating environment.

Description

Technical Field

[0001] The invention belongs to the technical field of hazardous waste treatment, and particularly relates to a treatment system and a treatment process for sodium methoxide solid waste. Background Art

[0002] Sodium methoxide (CH3ONa) is an organic compound and a hazardous chemical. It is corrosive and pyrophoric. It is readily soluble in solvents such as methanol and ethanol, and prepared sodium methoxide-methanol solutions are often used in industry. Sodium methoxide has a wide range of applications in many fields. In organic synthesis, it is primarily used in addition reactions, polycondensation reactions, and molecular rearrangement reactions. It can also participate in the synthesis of various important intermediates in the pharmaceutical and pesticide industries. In the printing and dyeing industry, sodium methoxide is used as a raw material to prepare dyes and pigments. In food processing, sodium methoxide is used as a catalyst to catalyze the conversion of animal and vegetable oils into edible oils.

[0003] Sodium methoxide is sensitive to air and moisture. Solid sodium methoxide quickly decomposes into methanol and sodium hydroxide when it comes into contact with water, which is very likely to cause combustion or even explosion accidents. Due to equipment updates and process improvements in industrial production, sodium methoxide-methanol solutions are now mostly used instead of solid sodium methoxide. However, there is a problem that high-purity sodium methoxide solid waste needs to be safely handled. At present, the method for disposing of sodium methoxide mainly adopts dried methanol and ethanol solvents for dissolution and then incineration. Since methanol, ethanol, etc. can be miscible with water in any proportion, if the solvent is not dried and dehydrated properly, the dissolution process has a high safety risk. Therefore, it is necessary to seek a new safe disposal technology to achieve complete treatment of sodium methoxide solid waste to eliminate its hazardous characteristics. Summary of the Invention

[0004] The invention provides a treatment system and treatment process for sodium methoxide solid waste, which realizes safe treatment of sodium methoxide solid waste by controlling a reaction system under an inert gas atmosphere through a reaction process of hydrolysis-multi-stage oxidation-neutralization.

[0005] The purpose of the present invention is to provide a sodium methoxide solid waste treatment system;

[0006] Another object of the present invention is to provide a processing process based on the above processing system.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A sodium methoxide solid waste treatment system comprises a hydrolysis reactor, an oxidation reactor, a neutralization reactor and a solid-liquid separator connected in sequence;

[0009] The hydrolysis reactor is connected to an inert gas tank;

[0010] The oxidation reaction kettle is connected to an ozone generator and a chlorine dioxide generator;

[0011] The neutralization reactor is connected to a manganese chloride solution storage tank and a sodium hydroxide solution storage tank;

[0012] The hydrolysis reactor, oxidation reactor and neutralization reactor are all connected to an exhaust gas treatment system.

[0013] Furthermore, a first cooling water coil is provided on the outer wall of the hydrolysis reactor;

[0014] The outer wall of the neutralization reactor is provided with a second cooling water coil.

[0015] Furthermore, the exhaust gas treatment system includes three groups of absorption towers connected in sequence, and the absorption towers are divided into a primary absorption tower, a secondary absorption tower and a tertiary absorption tower;

[0016] The primary absorption tower is connected to the sodium hydroxide solution storage tank;

[0017] The secondary absorption tower is connected to the sulfuric acid solution storage tank in the factory area;

[0018] The three-stage absorption tower is filled with activated carbon.

[0019] Furthermore, a process for treating sodium methoxide solid waste comprises the following steps:

[0020] S1. Hydrolysis treatment: Under an inert gas atmosphere, sodium methoxide solid waste is added to a hydrolysis reactor pre-filled with water, and cooling water is introduced into the first cooling water coil on the outer wall of the hydrolysis reactor. By controlling the flow of cooling water, the temperature in the oxidation reactor is controlled to ≤30°C. The hydrolysis reaction is stirred for 2 hours to obtain a hydrolyzate. Reaction mechanism: CH3ONa+H2O→CH3OH+NaOH;

[0021] S2. Oxidation treatment: The hydrolyzed liquid is pumped into an oxidation reactor, ozone is introduced into the oxidation reactor through an ozone generator, and the reaction is carried out for 2 hours. Then, chlorine dioxide is introduced into the oxidation reactor through a chlorine dioxide generator, and the reaction is carried out for 1 hour to obtain an oxidized liquid; reaction mechanism: 3CH3OH+O3→3HCHO+3H2O;

[0022] 5HCHO+4ClO2→5CO2↑+4HCl+3H2O;

[0023] 2ClO2+5HCOOH→2HCl+5CO2↑+4H2O;

[0024] S3, neutralization treatment: pump the oxidizing liquid into the neutralization reactor, add manganese chloride solution, and pass cooling water into the second cooling water coil on the outer wall of the neutralization reactor. By controlling the flow of cooling water, the temperature in the neutralization reactor is controlled to be ≤30°C, and then add sodium hydroxide solution to adjust the pH to 7.5-8.0 to obtain a neutralized solution; reaction mechanism: 2ClO2+5MnCl2+6H2O→5MnO2↓+12HCl;

[0025] HCl + NaOH → NaCl + H2O;

[0026] S4, solid-liquid separation: the neutralized liquid is subjected to solid-liquid separation, the filter residue is recovered and reused, the filtrate is evaporated, crystallized and cooled to obtain evaporation liquid and industrial salt, the evaporation liquid is subjected to biochemical treatment, and the industrial salt is recovered and reused;

[0027] S5. Waste gas treatment: The waste gas generated during the reaction process of the hydrolysis reactor, oxidation reactor and neutralization reactor is introduced into the waste gas treatment system for treatment. After the treatment is completed, the treatment of sodium methoxide solid waste is completed.

[0028] Furthermore, the content of sodium methoxide in the sodium methoxide solid waste in step S1 is 99.0-99.5 wt%.

[0029] Furthermore, the concentration of the manganese chloride solution in step S3 is 50 wt%;

[0030] The amount of the manganese chloride solution is 18-23L;

[0031] The concentration of the sodium hydroxide solution is 32 wt %.

[0032] Beneficial effects of the present invention:

[0033] (1) In the sodium methoxide solid waste treatment process of the present invention, first, sodium methoxide is hydrolyzed under an inert gas atmosphere to react and generate methanol and sodium hydroxide, thereby achieving safe decomposition of sodium methoxide; then, ozone is used to oxidize and degrade the methanol in the system into formaldehyde, wherein part of the formaldehyde is oxidized into formic acid, and the formaldehyde and formic acid in the system are further degraded into carbon dioxide, hydrogen chloride and water by chlorine dioxide; then, the present invention uses manganese chloride solution to treat excess chlorine dioxide and form insoluble manganese dioxide; finally, the present invention uses sodium hydroxide for neutralization treatment, and after solid-liquid separation, the solid is the generated manganese dioxide, which is purified and reused, and the liquid is evaporated and crystallized to form sodium chloride, which is prepared into industrial salt for application in the chlor-alkali industry, etc., and the evaporated water can be treated in a sewage treatment system and reused.

[0034] (2) The sodium methoxide solid waste treatment system of the present invention is constructed based on the above-mentioned treatment process, and the purpose of improving the reaction efficiency is achieved by providing a first cooling water coil and a second cooling water coil.

[0035] (3) The sodium methoxide solid waste treatment process of the present invention can achieve complete and safe disposal of sodium methoxide solid waste, and effectively collect and treat the three wastes in the system throughout the reaction process. The present invention aims to achieve safe disposal of sodium methoxide solid waste while ensuring the safety of the operating environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below with reference to the accompanying drawings.

[0037] Figure 1 The present invention is a process flow chart of a sodium methoxide solid waste treatment system. DETAILED DESCRIPTION

[0038] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] Example 1

[0040] A sodium methoxide solid waste treatment system comprises a hydrolysis reactor, an oxidation reactor, a neutralization reactor and a solid-liquid separator which are connected in sequence.

[0041] Part 1:

[0042] First, a first feed port and a first waste gas outlet are sequentially opened on the upper part of the hydrolysis reactor, and a first discharge port is opened on the lower part of the hydrolysis reactor. At the same time, a second feed port and a second waste gas outlet are sequentially opened on the upper part of the oxidation reactor. A first pump is provided on one side of the first discharge port, and the first discharge port is connected to the feed port of the first pump, and the discharge port of the first pump is connected to the second feed port.

[0043] Then, a second discharge port is opened at the lower part of the oxidation reactor. At the same time, a third feed port and a third waste gas outlet are opened in sequence at the upper part of the neutralization reactor. A second pump is set on one side of the second discharge port. The second discharge port is connected to the feed port of the second pump, and the discharge port of the second pump is connected to the third feed port.

[0044] Next, a third discharge port is opened at the lower part of the neutralization reactor. At the same time, a fourth feed port is opened at the upper part of the solid-liquid separator. A third pump is provided on one side of the third discharge port. The third discharge port is connected to the feed port of the third pump, and the discharge port of the third pump is connected to the fourth feed port.

[0045] Through the connection relationship of the first part, the hydrolysis reactor, the oxidation reactor, the neutralization reactor and the solid-liquid separator are connected in sequence.

[0046] Part II:

[0047] First, an inert gas inlet is provided on the top of the hydrolysis reactor; the inert gas inlet is connected to an inert gas tank, and nitrogen or argon is stored in the inert gas tank.

[0048] Then, an ozone gas inlet and a chlorine dioxide gas inlet are further provided on the upper portion of the oxidation reaction kettle; the ozone gas inlet is connected to an ozone generator, and the chlorine dioxide gas inlet is connected to a chlorine dioxide generator.

[0049] Finally, a manganese chloride solution inlet and a sodium hydroxide solution inlet are also opened on the upper part of the neutralization reactor; the manganese chloride solution inlet is connected to the manganese chloride solution storage tank, and the sodium hydroxide solution inlet is connected to the sodium hydroxide solution storage tank.

[0050] Through the connection relationship of the second part, the inert gas input in the hydrolysis process, the ozone and chlorine dioxide input in the oxidation process, and the manganese chloride solution and sodium hydroxide solution input in the neutralization process are completed.

[0051] Part III:

[0052] First, a first cooling water coil is laid on the outer wall of the hydrolysis reactor; and a second cooling water coil is laid on the outer wall of the neutralization reactor.

[0053] Then, the water inlets of the first cooling water coil and the second cooling water coil are both connected to the industrial water pipe of the factory area; the water outlets of the first cooling water coil and the second cooling water coil are both connected to the wastewater treatment tank of the factory area.

[0054] Through the connection relationship of the third part, the circulating cooling of the hydrolysis reactor and the neutralization reactor is completed. First, the hydrolysis reaction of sodium methoxide is an exothermic reaction. The first cooling water coil can improve the hydrolysis efficiency of sodium methoxide through heat exchange. Then, the reaction between chlorine dioxide and manganese chloride is an exothermic reaction. At the same time, the neutralization reaction between hydrochloric acid and sodium hydroxide solution is also an exothermic reaction. The second cooling water coil can improve the reaction efficiency of the above reactions through heat exchange.

[0055] Part 4:

[0056] The first waste gas outlet on the upper part of the hydrolysis reactor, the second waste gas outlet on the upper part of the oxidation reactor, and the third waste gas outlet on the upper part of the neutralization reactor are all connected to the waste gas treatment system.

[0057] The exhaust gas treatment system includes three groups of absorption towers connected in sequence, which are divided into primary absorption tower, secondary absorption tower and tertiary absorption tower;

[0058] First, a first waste gas inlet is opened at the lower part of the side wall of the first absorption tower, a first absorbent inlet is opened at the upper part of the side wall of the first absorption tower, and a first waste gas outlet is opened at the top of the first absorption tower.

[0059] Then, a second waste gas inlet is opened at the lower part of the side wall of the second absorption tower, a second absorbent inlet is opened at the upper part of the side wall of the second absorption tower, and a second waste gas outlet is opened at the top of the second absorption tower.

[0060] Next, a third waste gas inlet is opened at the lower part of the side wall of the third absorption tower, a third absorbent inlet is opened at the upper part of the side wall of the third absorption tower, and a third waste gas outlet is opened at the top of the third absorption tower.

[0061] Finally, the first exhaust gas outlet, the second exhaust gas outlet, and the third exhaust gas outlet are all connected to the first exhaust gas inlet; the first exhaust gas outlet is connected to the second exhaust gas inlet; the second exhaust gas outlet is connected to the third exhaust gas inlet; a vacuum pump is provided on one side of the third exhaust gas outlet, the third exhaust gas outlet is connected to the air inlet end of the vacuum pump, and the air outlet end of the vacuum pump is connected to the bottom flue of the factory area direct exhaust chimney.

[0062] The first absorbent inlet of the primary absorption tower is connected to the sodium hydroxide solution storage tank, and the primary absorption tower is filled with 0.1-1wt% sodium hydroxide solution;

[0063] The second absorbent inlet of the secondary absorption tower is connected to the sulfuric acid solution storage tank in the plant area, and the secondary absorption tower is filled with 0.1-1wt% sulfuric acid solution;

[0064] Among them, the third absorbent inlet of the tertiary absorption tower is used for adding activated carbon, and the tertiary absorption tower is filled with activated carbon.

[0065] Through the connection relationship of the fourth part mentioned above, the treatment of waste gas in the process of hydrolysis, oxidation and neutralization is completed.

[0066] Example 2

[0067] See also Figure 1 As shown, a process for treating sodium methoxide solid waste comprises the following steps:

[0068] Under an inert gas atmosphere, 10 kg of sodium methoxide solid waste (sodium methoxide content: 99.1 wt%) was taken and added to a 200 L hydrolysis reactor pre-filled with 100 L of water, and cooling water was passed into the first cooling water coil on the outer wall of the hydrolysis reactor. By controlling the flow rate of the cooling water, the temperature in the oxidation reactor was controlled to be ≤30 ° C. After 2 hours of hydrolysis reaction, a hydrolyzate was obtained, and the hydrolyzate was pumped into the 200 L oxidation reactor. Ozone was introduced into the oxidation reactor through an ozone generator. Methanol in the ozone oxidation system was used. After reacting for 2 hours, chlorine dioxide was prepared using a chlorine dioxide generator and passed into the bottom of the oxidation reactor. The reaction was carried out for 1 hour. After completion of the reaction, an oxidized solution was obtained, and the oxidized solution was pumped into the 200 L neutralization reactor. 19 L of 50 wt% manganese chloride solution was added to the neutralization reactor to remove excess chlorine dioxide, and cooling water was passed into the second cooling water coil on the outer wall of the neutralization reactor. By controlling the flow rate of the cooling water, the temperature in the neutralization reactor was controlled to be ≤3 The method comprises the following steps: heating the reactor to a temperature of 0°C, adding 32 wt% sodium hydroxide solution to adjust the pH of the solution to 8.0 to obtain a neutralized solution, pumping the neutralized liquid into a solid-liquid separator, and then performing solid-liquid separation. The filter residue is manganese dioxide insoluble matter, which can be reused to produce manganese chloride; the filtrate is a sodium chloride solution, which is evaporated and crystallized to produce industrial sodium chloride. The evaporation and crystallization cooling effluent is biochemically treated to meet the discharge standards or be reused. The biochemical effluent test data are as follows: pH: 8.1, COD: 29 mg / L, TDS: 358 mg / L, and total manganese content: 0.8 mg / L. Finally, the waste gas generated during the reaction process of the hydrolysis reactor, the oxidation reactor, and the neutralization reactor is introduced into a waste gas treatment system for treatment. The waste gas treatment system includes three groups of absorption towers connected in sequence, and the absorption towers are divided into a primary absorption tower, a secondary absorption tower, and a tertiary absorption tower. The primary absorption tower contains 0.1 wt% sodium hydroxide solution, the secondary absorption tower contains 0.1 wt% sulfuric acid solution, and the tertiary absorption tower contains activated carbon.

[0069] Example 3

[0070] See also Figure 1 As shown, a process for treating sodium methoxide solid waste comprises the following steps:

[0071] Under an inert gas atmosphere, 10 kg of sodium methoxide solid waste (sodium methoxide content: 99.5 wt %) was taken and added to a 200 L hydrolysis reactor pre-filled with 100 L of water, and cooling water was passed into the first cooling water coil on the outer wall of the hydrolysis reactor. By controlling the flow rate of the cooling water, the temperature in the oxidation reactor was controlled to be ≤30 ° C. After 2 hours of hydrolysis reaction, a hydrolyzate was obtained, and the hydrolyzate was pumped into the 200 L oxidation reactor. Ozone was introduced into the oxidation reactor through an ozone generator. Methanol in the ozone oxidation system was used. After reacting for 2 hours, chlorine dioxide was prepared using a chlorine dioxide generator and passed into the bottom of the oxidation reactor. The reaction was carried out for 1 hour. After completion of the reaction, an oxidized solution was obtained, and the oxidized solution was pumped into a 200 L neutralization reactor. 23 L of 50 wt % manganese chloride solution was added to the neutralization reactor to remove excess chlorine dioxide, and cooling water was passed into the second cooling water coil on the outer wall of the neutralization reactor. By controlling the flow rate of the cooling water, the temperature in the neutralization reactor was controlled to be ≤3 The method comprises the following steps: heating the reactor to a temperature of 0°C, adding 32 wt% sodium hydroxide solution to adjust the pH of the solution to 7.5 to obtain a neutralized solution, pumping the neutralized liquid into a solid-liquid separator, and then performing solid-liquid separation. The filter residue is manganese dioxide insoluble matter, which can be reused to produce manganese chloride; the filtrate is a sodium chloride solution, which is evaporated and crystallized to produce industrial sodium chloride. The evaporation and crystallization cooling effluent is biochemically treated to meet the discharge standards or be reused. The biochemical effluent test data are as follows: pH: 7.8, COD: 35 mg / L, TDS: 337 mg / L, and total manganese content: 0.4 mg / L. Finally, the waste gas generated during the reaction process of the hydrolysis reactor, the oxidation reactor, and the neutralization reactor is introduced into a waste gas treatment system for treatment. The waste gas treatment system includes three groups of absorption towers connected in sequence, and the absorption towers are divided into a primary absorption tower, a secondary absorption tower, and a tertiary absorption tower. The primary absorption tower contains 0.5 wt% sodium hydroxide solution, the secondary absorption tower contains 0.5 wt% sulfuric acid solution, and the tertiary absorption tower contains activated carbon.

[0072] Example 4

[0073] See also Figure 1 As shown, a process for treating sodium methoxide solid waste comprises the following steps:

[0074] Under an inert gas atmosphere, 10 kg of sodium methoxide solid waste (sodium methoxide content: 99.3 wt%) was taken and added to a 200 L hydrolysis reactor pre-filled with 100 L of water, and cooling water was passed into the first cooling water coil on the outer wall of the hydrolysis reactor. By controlling the flow rate of the cooling water, the temperature in the oxidation reactor was controlled to be ≤30 ° C. After 2 hours of hydrolysis reaction, a hydrolyzate was obtained, and the hydrolyzate was pumped into the 200 L oxidation reactor. Ozone was introduced into the oxidation reactor through an ozone generator. Methanol in the ozone oxidation system was used. After reacting for 2 hours, chlorine dioxide was prepared using a chlorine dioxide generator and passed into the bottom of the oxidation reactor. The reaction was carried out for 1 hour. After completion of the reaction, an oxidized solution was obtained, which was pumped into a 200 L neutralization reactor. 22 L of 50 wt% manganese chloride solution was added to the neutralization reactor to remove excess chlorine dioxide, and cooling water was passed into the second cooling water coil on the outer wall of the neutralization reactor. By controlling the flow rate of the cooling water, the temperature in the neutralization reactor was controlled to be ≤3 The method comprises the following steps: heating the mixture to 0°C, adding 32wt% sodium hydroxide solution to adjust the pH of the solution to 7.7 to obtain a neutralized solution, pumping the neutralized liquid into a solid-liquid separator, and then performing solid-liquid separation. The filter residue is manganese dioxide insoluble matter, which can be reused to produce manganese chloride; the filtrate is a sodium chloride solution, which is evaporated and crystallized to produce industrial sodium chloride. The evaporation and crystallization cooling effluent is biochemically treated to meet the discharge standards or be reused. The biochemical effluent test data are as follows: pH: 7.9, COD: 31mg / L, TDS: 314mg / L, and total manganese content: 0.5mg / L. Finally, the waste gas generated during the reaction process of the hydrolysis reactor, the oxidation reactor, and the neutralization reactor is introduced into a waste gas treatment system for treatment. The waste gas treatment system includes three groups of absorption towers connected in sequence, and the absorption towers are divided into a primary absorption tower, a secondary absorption tower, and a tertiary absorption tower. The primary absorption tower contains 0.8wt% sodium hydroxide solution, the secondary absorption tower contains 0.8wt% sulfuric acid solution, and the tertiary absorption tower contains activated carbon.

[0075] Example 5

[0076] See also Figure 1 As shown, a process for treating sodium methoxide solid waste comprises the following steps:

[0077] Under an inert gas atmosphere, 10 kg of sodium methoxide solid waste (sodium methoxide content: 99.0 wt%) was taken and added to a 200 L hydrolysis reactor pre-filled with 100 L of water, and cooling water was passed into the first cooling water coil on the outer wall of the hydrolysis reactor. By controlling the flow of cooling water, the temperature in the oxidation reactor was controlled to be ≤30 ° C. After 2 h of hydrolysis reaction, a hydrolyzate was obtained, which was pumped into a 200 L oxidation reactor, and ozone was introduced into the oxidation reactor through an ozone generator. Methanol in the ozone oxidation system was used, and after 2 h of reaction, a chlorine dioxide generator was used to prepare chlorine dioxide, which was passed into the bottom of the oxidation reactor. The reaction was carried out for 1 h. After completion of the reaction, an oxidized solution was obtained, which was pumped into a 200 L neutralization reactor. 18 L of 50 wt% manganese chloride solution was added to the neutralization reactor to remove excess chlorine dioxide, and then 32 wt% sodium hydroxide solution was added to adjust the pH of the solution. To 7.9, a neutralized liquid is obtained, and the neutralized liquid is pumped into a solid-liquid separator for solid-liquid separation. The filter residue is manganese dioxide insoluble matter, which can be reused to produce manganese chloride; the filtrate is a sodium chloride solution, which is evaporated and crystallized to produce industrial sodium chloride. The evaporation and crystallization cooling effluent is biochemically treated and meets the discharge standards or reused. The biochemical effluent test data are: pH: 8.0, COD: 23 mg / L, TDS: 303 mg / L, and total manganese content: 0.6 mg / L. Finally, the waste gas generated during the reaction process of the hydrolysis reactor, the oxidation reactor, and the neutralization reactor is introduced into a waste gas treatment system for treatment. The waste gas treatment system includes three groups of absorption towers connected in sequence. The absorption towers are divided into a primary absorption tower, a secondary absorption tower, and a tertiary absorption tower. The primary absorption tower contains 1wt% sodium hydroxide solution, the secondary absorption tower contains 1wt% sulfuric acid solution, and the tertiary absorption tower contains activated carbon.

[0078] The treatment processes in Examples 2 to 5 above are processes for treating sodium methoxide solid waste entrusted to our company by the enterprise. Sodium methoxide solid waste is a hazardous chemical. The present invention provides a process for treating sodium methoxide solid waste: first, the sodium methoxide solid waste is hydrolyzed under an inert gas atmosphere to react to generate methanol and sodium hydroxide, thereby achieving safe decomposition of sodium methoxide; then, ozone is used to oxidize and degrade the methanol in the system into formaldehyde, wherein part of the formaldehyde is oxidized into formic acid, and the formaldehyde and formic acid in the system are further degraded into carbon dioxide, hydrogen chloride and water by chlorine dioxide; then, excess chlorine dioxide is treated with a manganese chloride solution to form insoluble manganese dioxide; finally, sodium hydroxide is used for neutralization treatment, and after solid-liquid separation, the solid is the generated manganese dioxide, which is purified and reused, and the liquid is evaporated and crystallized to form sodium chloride, which is prepared into industrial salt for application in the chlor-alkali industry, etc. The evaporated water can enter the sewage treatment system for treatment and reuse. The treatment processes in Examples 2 to 5 above can achieve complete and safe disposal of sodium methoxide solid waste, and the three wastes in the system are effectively collected and treated throughout the reaction process, thereby achieving safe disposal of sodium methoxide solid waste while ensuring the safety of the operating environment.

[0079] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0080] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sodium methoxide solid waste treatment system, characterized in that: It comprises a hydrolysis reactor, an oxidation reactor, a neutralization reactor and a solid-liquid separator which are connected in sequence; The hydrolysis reactor is connected to an inert gas tank; The oxidation reaction kettle is connected to an ozone generator and a chlorine dioxide generator; The neutralization reactor is connected to a manganese chloride solution storage tank and a sodium hydroxide solution storage tank; The hydrolysis reactor, oxidation reactor and neutralization reactor are all connected to an exhaust gas treatment system; The outer wall of the hydrolysis reactor is provided with a first cooling water coil; The outer wall of the neutralization reactor is provided with a second cooling water coil; The exhaust gas treatment system includes three groups of absorption towers connected in sequence, the absorption towers are divided into a primary absorption tower, a secondary absorption tower and a tertiary absorption tower; The primary absorption tower is connected to the sodium hydroxide solution storage tank; The secondary absorption tower is connected to the sulfuric acid solution storage tank in the factory area; The three-stage absorption tower is filled with activated carbon.

2. A process for treating sodium methoxide solid waste, characterized in that: The sodium methoxide solid waste treatment system according to claim 1 comprises the following steps: S1. Hydrolysis treatment: Under an inert gas atmosphere, sodium methoxide solid waste is added to a hydrolysis reactor pre-filled with water, and cooling water is introduced into the first cooling water coil on the outer wall of the hydrolysis reactor. By controlling the flow of cooling water, the temperature in the oxidation reactor is controlled to be ≤30°C, and the hydrolysis reaction is stirred for 2 hours to obtain a hydrolyzed solution; S2, oxidation treatment: the hydrolyzed liquid is pumped into an oxidation reactor, ozone is introduced into the oxidation reactor through an ozone generator, and the reaction is carried out for 2 hours, and then chlorine dioxide is introduced into the oxidation reactor through a chlorine dioxide generator, and the reaction is carried out for 1 hour to obtain an oxidized liquid; S3, neutralization treatment: pump the oxidizing liquid into the neutralization reactor, add manganese chloride solution, and pass cooling water into the second cooling water coil on the outer wall of the neutralization reactor. By controlling the flow of cooling water, the temperature in the neutralization reactor is controlled to be ≤30°C, and then add sodium hydroxide solution to adjust the pH to 7.5-8.0 to obtain a neutralized solution; S4, solid-liquid separation: the neutralized liquid is subjected to solid-liquid separation, the filter residue is recovered and reused, the filtrate is evaporated, crystallized and cooled to obtain evaporation liquid and industrial salt, the evaporation liquid is subjected to biochemical treatment, and the industrial salt is recovered and reused; S5. Waste gas treatment: The waste gas generated during the reaction process of the hydrolysis reactor, oxidation reactor and neutralization reactor is introduced into the waste gas treatment system for treatment. After the treatment is completed, the treatment of sodium methoxide solid waste is completed.

3. A process for treating sodium methoxide solid waste according to claim 2, characterized in that: The content of sodium methoxide in the sodium methoxide solid waste in step S1 is 99.0-99.5 wt%.

4. A process for treating sodium methoxide solid waste according to claim 2, characterized in that: The concentration of the manganese chloride solution in step S3 is 50 wt%; The amount of the manganese chloride solution is 18-23L; The concentration of the sodium hydroxide solution is 32 wt %.

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