Gas treatment device for producing organic ketone peroxide

Abstract

The invention discloses a gas treatment device for organic ketone peroxide production, which comprises a quench tower, a buffer tank and an emergency treatment unit, and is characterized in that the emergency treatment unit is arranged to realize full-closed-loop safety treatment of overpressure gas, and an emergency release valve with a rupture disk and safety valve dual-redundancy structure is adopted; discharged gas is directionally guided into a torch system to be completely combusted, the deflagration risk caused by direct emission to the atmosphere is eradicated, combustion tail gas automatically passes through a quenching absorption tower and an alkaline washing tower, double purification of acid gas and phenolic toxins is achieved, a high-pressure nitrogen injection valve is synchronously triggered to dilute system gas, and a four-stage intrinsic safety barrier of pressure relief, explosion suppression, combustion and purification is formed. And the risks of overpressure explosion and secondary pollution in the production of the organic ketone peroxide are fundamentally eliminated.

Description

Technical Field

[0001] The present invention relates to the field of organic waste gas treatment, in particular to a gas treatment device for producing organic ketone peroxide. Background Art

[0002] Organic ketone peroxides (such as methyl ethyl ketone peroxide, cyclohexanone peroxide, etc.) are important initiators for polymer polymerization reactions, but the high-temperature exhaust gas generated during their production contains unreacted ketone peroxide monomers, organic solvents and decomposition products, and has extremely strong thermal instability and explosion risks.

[0003] The existing technology is unable to quickly release the gas under overpressure conditions, and lacks a safe diversion and destruction mechanism for the released gas. At present, only the sound and light alarm is triggered by the pressure sensor, and there is no safe disposal channel for the released gas. Manual control of pressure relief and discharge is required. The release path is directly connected to the atmosphere. The released high-concentration ketone peroxide gas will explode when it encounters air. The released gas carries highly toxic phenols and acidic substances, causing secondary pollution. The released gas is not introduced into a closed treatment system and freely diffuses into the workshop environment, forming an explosive mixture. Summary of the Invention

[0004] Therefore, in order to solve the above-mentioned shortcomings, the present invention provides a gas processing device for producing organic ketone peroxide.

[0005] The present invention is achieved by constructing a gas treatment device for the production of organic ketone peroxide, the device comprising a quenching tower 1, a buffer tank 2 and an emergency treatment unit 3;

[0006] The quenching tower 1 has a built-in low-temperature circulating liquid spraying system for instantly cooling the exhaust gas to below 50°C;

[0007] The buffer tank 2 is connected to the outlet of the quenching tower 1 and is provided with an agitator and an inert gas purge port 22;

[0008] The emergency treatment unit 3 is connected to the quenching tower 1 and the buffer tank 2 respectively;

[0009] The emergency treatment unit 3 includes an emergency relief valve 31, an inert gas injection valve 32, a flare system 33, a quenching absorption tower 34, an alkali washing tower 35 and a high-pressure nitrogen storage tank 36. The flare system 33 is connected to the quenching tower 1 and the buffer tank 2 respectively through the emergency relief valve 31. The outlet of the flare system 33 is connected to the quenching absorption tower 34, and the outlet of the quenching absorption tower 34 is connected to the alkali washing tower 35. The outlet of the alkali washing tower 35 is connected to the exhaust chimney 4. The high-pressure nitrogen storage tank 36 is connected to the quenching tower 1 and the buffer tank 2 respectively through the inert gas injection valve 32.

[0010] The emergency relief valve 31 adopts a dual-redundancy structure with a bursting disc and a safety valve, and its outlet is connected to the flare system 33.

[0011] A multi-parameter sensor group 5 is provided in the quenching tower 1 and the buffer tank 2 , and the multi-parameter sensor group 5 is used to monitor the temperature, pressure and ketone peroxide concentration in real time.

[0012] The multi-parameter sensor group 5 includes an infrared spectrometer and a pressure transmitter, and the ketone peroxide concentration threshold is set to 25% of the lower explosion limit, and the temperature threshold is set to 60°C.

[0013] The flare system 33 includes a liquid separation tank 331, a double-stage detonation flame arrester 332 and a steam-assisted combustion flare head 333. The flare head 333 is provided with a pilot lamp and a flame detector.

[0014] The top gas outlet of the buffer tank 2 is connected to a catalytic oxidation reactor 6 filled with a Pt / Al 2 O 3 catalyst 61 . The outlet of the catalytic oxidation reactor 6 is connected to an adsorption tower 7 , and the outlet of the adsorption tower 7 is connected to an exhaust chimney 4 .

[0015] The condensate outlet at the bottom of the buffer tank 2 is connected to the condensate processing system 8 .

[0016] The condensate treatment system 8 includes a pretreatment filter 81 , a preheater 82 , a fixed-bed catalytic reactor 83 , and a distillation system 84 , which are connected in sequence.

[0017] The quenching absorption tower 34 sprays a NaOH solution with a pH value of ≥ 12 to cool the over-pressure gas, and the gas is rapidly cooled to below 80°C.

[0018] The alkali washing tower 35 is provided with an online pH monitor, and the tail gas is discharged through the discharge chimney 4 after reaching the standard.

[0019] The present invention has the following advantages: The present invention provides a gas treatment device for the production of organic ketone peroxide through improvement, which has the following improvements compared with similar equipment:

[0020] The gas treatment device for the production of organic ketone peroxide described in the present invention realizes a fully closed-loop safe disposal of overpressure gas through the provision of an emergency treatment unit, adopts an emergency relief valve with a dual redundant structure of a bursting disc and a safety valve, and directionally introduces the relief gas into a flare system for complete combustion, thereby eliminating the risk of deflagration caused by direct discharge into the atmosphere. The combustion exhaust gas automatically passes through a quenching absorption tower and an alkali washing tower to achieve dual purification of acidic gases and phenolic toxins, and synchronously triggers a high-pressure nitrogen injection valve to dilute the system gas, forming a four-level intrinsic safety barrier of pressure relief, explosion suppression, combustion, and purification, thereby eliminating the risks of overpressure explosion and secondary pollution in the production of organic ketone peroxide from the root. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a structural block diagram of the present invention;

[0022] Figure 2 It is a structural block diagram of the emergency processing unit of the present invention;

[0023] Figure 3 It is a structural block diagram of the flare system of the present invention;

[0024] Figure 4 It is a structural block diagram of the condensate treatment system of the present invention.

[0025] Among them: quenching tower 1, buffer tank 2, inert gas purge port 22, emergency treatment unit 3, exhaust chimney 4, multi-parameter sensor group 5, catalytic oxidation reactor 6, adsorption tower 7, condensate treatment system 8;

[0026] Emergency relief valve 31, inert gas injection valve 32, flare system 33, quenching absorption tower 34, alkali washing tower 35, high-pressure nitrogen storage tank 36;

[0027] Pretreatment filter 81, preheater 82, fixed bed catalytic reactor 83, distillation system 84;

[0028] Liquid separation tank 331 , double-stage detonation flame arrester 332 , and steam-assisted combustion torch head 333 . DETAILED DESCRIPTION

[0029] The following will be combined with the Figure 1-4 The present invention is described in detail, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] See also Figure 1 , a gas treatment device for producing organic ketone peroxide of the present invention comprises a quenching tower 1, a buffer tank 2 and an emergency treatment unit 3;

[0031] The quenching tower 1 is equipped with a low-temperature circulating liquid spray system to instantly cool the exhaust gas to below 50°C. The low-temperature circulating liquid spray system is made of 316L stainless steel and includes three layers of radially distributed spiral nozzles (2mm in diameter). The spray pressure is 0.8MPa. The low-temperature circulating liquid is an ethylene glycol-water solution (30% concentration). The temperature is maintained at -15°C ± 2°C by a refrigeration unit. The exhaust gas rises from the bottom of the tower at a flow rate of 1.5m / s and contacts the spray liquid in countercurrent. It is cooled from 120°C to 45°C within 0.5 seconds. The condensation efficiency of ketone peroxide is ≥92%.

[0032] Buffer tank 2 is connected to the outlet of quench tower 1 and is equipped with an agitator and inert gas purge port 22. This port is connected to a circular gas distribution pipe and has 5mm diameter injection holes (100mm apart) circumferentially along the tank wall. 99.99% high-purity nitrogen is continuously introduced at a flow rate of 15L / min to maintain an oxygen content of less than 6%. Agitator 21 is an anchor-type agitator operating at 45rpm to prevent condensate stratification and accumulation.

[0033] The emergency treatment unit 3 is connected to the quenching tower 1 and the buffer tank 2 respectively;

[0034] A multi-parameter sensor group 5 is provided in the quenching tower 1 and the buffer tank 2. The multi-parameter sensor group 5 is used to monitor the temperature, pressure and ketone peroxide concentration in real time;

[0035] The multi-parameter sensor group 5 includes an infrared spectrometer and a pressure transmitter, and the ketone peroxide concentration threshold is set to 25% of the lower explosion limit and the temperature threshold is set to 60°C;

[0036] Infrared spectrometer (Axetris IR-ETH) real-time scanning 1600-1800 cm -1 Characteristic peak, dynamic calculation of ketone peroxide concentration. Pressure transmitter (Rosemount 3051S) range 0-0.5MPa, accuracy ±0.1%. Control unit settings:

[0037] Concentration > 25% LEL (i.e. > 1.25 vol%)

[0038] Temperature > 60°C

[0039] Pressure>0.2MPa

[0040] If any parameter exceeds the limit, emergency processing will be triggered, and the response time is ≤0.3 seconds

[0041] The top gas outlet of the buffer tank 2 is connected to the catalytic oxidation reactor 6, which is filled with a Pt / Al2O3 catalyst 61. The outlet of the catalytic oxidation reactor 6 is connected to the adsorption tower 7, and the outlet of the adsorption tower 7 is connected to the exhaust chimney 4;

[0042] The Pt / Al2O3 catalyst (Pt loading 1.2%) has a honeycomb ceramic structure with a pore density of 400 cpsi. Operating temperature: 380°C ± 10°C, space velocity: 10,000 h⁻¹, VOC conversion: ≥ 99.5%. Reaction heat is used to preheat the intake air (heat exchange efficiency: 85%).

[0043] See also Figure 2The emergency treatment unit 3 includes an emergency relief valve 31, an inert gas injection valve 32, a flare system 33, a quenching absorption tower 34, an alkali washing tower 35 and a high-pressure nitrogen storage tank 36. The flare system 33 is connected to the quenching tower 1 and the buffer tank 2 respectively through the emergency relief valve 31. The outlet of the flare system 33 is connected to the quenching absorption tower 34, and the outlet of the quenching absorption tower 34 is connected to the alkali washing tower 35. The outlet of the alkali washing tower 35 is connected to the exhaust chimney 4. The high-pressure nitrogen storage tank 36 is connected to the quenching tower 1 and the buffer tank 2 respectively through the inert gas injection valve 32;

[0044] The emergency relief valve 31 adopts a dual redundant structure with a bursting disc and a safety valve, and its outlet is connected to the flare system 33;

[0045] The quenching absorption tower 34 sprays a NaOH solution with a pH of ≥ 12 to cool the over-pressure gas, and the gas is suddenly cooled to below 80°C. The spraying system of the quenching absorption tower 34 adopts a solid cone nozzle, and the flow rate of the NaOH solution (concentration 15%) is 80m 3 / h. The gas is quenched in the packing layer (rectangular saddle ring packing, height 2.5m), with the temperature dropping from 500°C to 75°C in ≤ 1 second, while the acid gas is neutralized at the same time;

[0046] Alkali washing tower 35 is equipped with an online pH monitor. After the tail gas meets the standards, it is discharged through the exhaust chimney 4. The online pH monitor (Mettler Trophsen) controls the metering pump to automatically add NaOH to maintain pH = 7.0 ± 0.5. The tower is equipped with a two-stage demister (baffle + wire mesh), and the mist carryover is < 50mg / m 3 ;

[0047] See also Figure 3 The flare system 33 consists of a separatory tank 331, a two-stage detonation flame arrester 332, and a steam-assisted flare head 333. The flare head 333 is equipped with a pilot light and flame detector. Separator 331 is equipped with a corrugated plate demister, achieving a droplet removal rate of ≥98%. The two-stage detonation flame arrester 332 (compliant with ISO 16852) utilizes a 316SS sintered metal filter element with an explosion velocity of 1800 m / s. The steam injection rate of the steam-assisted flare head 333 is automatically adjusted based on a 30:1 gas-to-gas ratio to maintain a combustion temperature of 1150°C ± 50°C.

[0048] See also Figure 4 The condensate outlet at the bottom of the buffer tank 2 is connected to the condensate treatment system 8; the condensate treatment system 8 includes a pretreatment filter 81, a preheater 82, a fixed bed catalytic reactor 83, and a distillation system 84 connected in sequence.

[0049] Pre-treatment filter 81: 20μm sintered metal filter element, automatic backwashing with pressure difference > 0.1MPa;

[0050] Preheater 82: uses the waste heat from catalytic oxidation to heat the material from 25°C to 85°C;

[0051] Fixed bed catalytic reactor 83: HZSM-5 catalyst (SiO2 / Al2O3=80), reaction conditions 90°C / 0.5MPa, ketone peroxide conversion rate 96%;

[0052] Distillation system 84: The first tower recovers acetone (tower top temperature 56°C), and the second tower extracts phenol (tower bottom temperature 182°C).

[0053] The present invention provides a gas treatment device for the production of organic ketone peroxide through improvement, and its working principle is as follows:

[0054] First, the exhaust gas pre-cooling and stabilization stage:

[0055] High-temperature exhaust gas (120°C) containing organic ketone peroxide enters quench tower 1 and is rapidly cooled to below 45°C within 0.5 seconds through countercurrent contact with a low-temperature circulating liquid spray system. This process utilizes the efficient heat exchange characteristics of an ethylene glycol-water solution (-15°C) to achieve a ketone peroxide condensation efficiency of ≥92%, suppressing the risk of gas-phase explosion at the source.

[0056] After pre-cooling, the gas enters the buffer tank 2, where it is continuously purged with nitrogen (oxygen content <6%) and stirred at 45 rpm to prevent the condensate from stratifying and accumulating, thus maintaining the system in an inert state.

[0057] Second, real-time monitoring and intelligent emergency response:

[0058] Multi-parameter sensor group 5 dynamically monitors temperature, pressure and ketone peroxide concentration (infrared spectrometer scans 1600-1800cm -1 Characteristic peak), when any parameter exceeds the limit (concentration>1.25vol%, temperature>60℃ or pressure>0.2MPa), the control system triggers the emergency process within 0.3 seconds:

[0059] Open the inert gas injection valve 32 to inject high-pressure nitrogen into the quenching tower 1 and the buffer tank 2 to achieve rapid dilution;

[0060] The emergency relief valve 31 (bursting disc + safety valve dual redundancy) is activated simultaneously to introduce the overpressure gas into the flare system 33.

[0061] Third, emergency gas deep treatment:

[0062] The flare system 33 uses a liquid separator 331 to remove droplets (efficiency ≥ 98%). After the double-stage detonation flame arrester 332 blocks the risk of backfire, the steam-assisted flare head 333 is used to completely burn at 1150℃±50℃.

[0063] The combustion exhaust gas enters the quenching absorption tower 34 (spraying 15% NaOH solution, cooling from 500°C to 75°C within 1 second) and the alkali washing tower 35 (pH = 7.0±0.5) in sequence, which double guarantees the neutralization of acidic substances and removal of particulate matter, and finally meets the emission standards.

[0064] Fourth, resource recycling and normal purification:

[0065] Normal operating conditions: The gas at the top of the buffer tank 2 passes through the catalytic oxidation reactor 6 (380℃, Pt / Al2O3 catalyst) to increase the VOCs conversion rate to ≥99.5%, and then passes through the adsorption tower 7 for deep purification before discharge.

[0066] Condensate treatment: The condensate at the bottom of the tank passes through a pretreatment filter 81, a preheater 82 (waste heat utilization), a fixed-bed catalytic reactor 83 (HZSM-5 catalyst, 90°C), and a distillation system 84 to recover acetone (purity ≥99%) and phenol in a graded manner.

[0067] The above shows and describes the basic principles, main features and advantages of the present invention, and the standard parts used in the present invention can be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.

[0068] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gas treatment device for the production of organic ketone peroxide, characterized in that: It comprises a quenching tower (1), a buffer tank (2) and an emergency treatment unit (3); The quenching tower (1) is equipped with a low-temperature circulating liquid spraying system (11); The buffer tank (2) is connected to the outlet of the quenching tower (1), and the buffer tank (2) is provided with an agitator (21) and an inert gas purge port (22); The emergency treatment unit (3) is connected to the quenching tower (1) and the buffer tank (2) respectively; The emergency treatment unit (3) includes an emergency relief valve (31), an inert gas injection valve (32), a flare system (33), a quenching absorption tower (34), an alkali washing tower (35) and a high-pressure nitrogen storage tank (36). The flare system (33) is connected to the quenching tower (1) and the buffer tank (2) through the emergency relief valve (31). The outlet of the flare system (33) is connected to the quenching absorption tower (34), and the outlet of the quenching absorption tower (34) is connected to the alkali washing tower (35). The outlet of the alkali washing tower (35) is connected to the exhaust chimney (4). The high-pressure nitrogen storage tank (36) is connected to the quenching tower (1) and the buffer tank (2) through the inert gas injection valve (32).

2. A gas treatment device for producing organic ketone peroxide according to claim 1, characterized in that: The emergency relief valve (31) adopts a dual-redundancy structure with a bursting disc and a safety valve, and the outlet is connected to the flare system (33).

3. A gas treatment device for producing organic ketone peroxide according to claim 1, characterized in that: A multi-parameter sensor group (5) is provided in the quenching tower (1) and the buffer tank (2), and the multi-parameter sensor group (5) is used to monitor the temperature, pressure and ketone peroxide concentration in real time.

4. A gas treatment device for producing organic ketone peroxide according to claim 3, characterized in that: The multi-parameter sensor group (5) comprises an infrared spectrometer and a pressure transmitter.

5. A gas treatment device for producing organic ketone peroxide according to claim 1, characterized in that: The flare system (33) comprises a liquid separation tank (331), a double-stage detonation flame arrester (332) and a steam-assisted combustion flare head (333). The flare head (333) is provided with a permanent lamp and a flame detector.

6. A gas treatment device for producing organic ketone peroxide according to claim 1, characterized in that: The top gas outlet of the buffer tank (2) is connected to the catalytic oxidation reactor (6), the outlet of the catalytic oxidation reactor (6) is connected to the adsorption tower (7), and the outlet of the adsorption tower (7) is connected to the emission chimney (4).

7. A gas treatment device for producing organic ketone peroxide according to claim 1, characterized in that: The condensate outlet at the bottom of the buffer tank (2) is connected to a condensate processing system (8).

8. A gas treatment device for producing organic ketone peroxide according to claim 7, characterized in that: The condensate treatment system (8) comprises a pretreatment filter (81), a preheater (82), a fixed bed catalytic reactor (83), and a distillation system (84) which are connected in sequence.

9. A gas treatment device for producing organic ketone peroxide according to claim 1, characterized in that: The quenching absorption tower (34) sprays a NaOH solution with a pH value of ≥12 to cool the overpressure gas.

10. A gas treatment device for producing organic ketone peroxide according to claim 1, characterized in that: The alkali washing tower (35) is provided with an online pH monitor, and the tail gas is discharged through the discharge chimney (4) after reaching the standard.

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