Method for treating waste gas by neopentyl glycol device

Abstract

The invention relates to the technical field of tail gas treatment of neopentyl glycol devices, and particularly discloses a method for treating waste gas by using a neopentyl glycol device, which comprises the following steps of: conveying tail gas WG1 of an aldehyde recovery tower, vacuum tail gas WG2 and tail gas WG3 of a trimethylamine storage tank into a washing tower together for washing, tower bottoms are introduced into a lower packing layer, a washing solution L1 is introduced into a middle packing layer, a washing solution L2 is introduced into a top packing layer, aldehyde recovery tower tail gas WG1, vacuum tail gas WG2 and trimethylamine storage tank tail gas WG3 entering the washing tower escape upwards from the bottom of the washing tower, and in the escape process, waste gas is washed by the tower bottoms, the washing solution L1 and the washing solution L2 on the three packing layers respectively; by adopting a solvent washing and spraying method, the treatment efficiency of the tail gas of the aldehyde recovery tower, the vacuum tail gas and the tail gas of the trimethylamine storage tank can be improved, and normal operation of a neopentyl glycol device is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of tail gas treatment in neopentyl glycol plants, and particularly relates to a method for treating waste gas in a neopentyl glycol plant. Background Technique

[0002] In the neopentyl glycol production plant, isobutyraldehyde and formaldehyde undergo a condensation reaction under the action of a basic catalyst (such as triethylamine) to form the intermediate hydroxy pivalaldehyde (HPA), which is then hydrogenated and reduced to neopentyl glycol under the catalysis of a palladium-carbon catalyst. This process route involves equipment such as reaction kettles, hydrogenation reactors, and distillation columns. The tail gas discharge points mainly include the aldehyde recovery tower, the vacuum system, and the storage tank breathing valve.

[0003] In the neopentyl glycol production plant, the tail gas of the aldehyde recovery tower is about 400 kg / h (continuous discharge), and the main components are: trimethylamine 33.5%, isobutyraldehyde 2%, and the rest is nitrogen; the vacuum tail gas (continuous discharge) is 300 kg / h, and the main components are: trimethylamine 45.2%, and the rest is nitrogen; the tail gas of the trimethylamine storage tank (intermittent discharge) is 30 kg / h, and the main components are: trimethylamine 79%, and the rest is nitrogen. Trimethylamine is a malodorous substance, and the allowable concentration in the environment is below 0.05 ppm. In the original production technology, the above three streams of waste gas go to the incinerator facilities supporting the neopentyl glycol plant for incineration treatment, mainly to treat trimethylamine and VOCs in the waste gas. Since the incineration temperature requirement for trimethylamine is above 800 °C, NOx will also be generated during the treatment process, and further denitrification treatment is required to meet the standards before final discharge.

[0004] However, during normal production, abnormal fluctuations in the incinerator may lead to poor treatment effect of trimethylamine incineration, causing environmental protection accidents and affecting the normal operation of the neopentyl glycol plant. Therefore, we need to propose a method for treating waste gas in a neopentyl glycol plant to solve the above existing problems, so as to improve the treatment efficiency of the tail gas of the aldehyde recovery tower, the vacuum tail gas, and the tail gas of the trimethylamine storage tank, and ensure the normal operation of the neopentyl glycol plant. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for treating waste gas in a neopentyl glycol plant, which can improve the treatment efficiency of the tail gas of the aldehyde recovery tower, the vacuum tail gas, and the tail gas of the trimethylamine storage tank, and ensure the normal operation of the neopentyl glycol plant, so as to solve the problems proposed in the above background technique.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A method for treating waste gas in a neopentyl glycol plant includes the following steps:

[0008] S1. The tail gas WG1 of the aldehyde recovery tower and the vacuum tail gas WG2 are hermetically collected through pipelines and sent to a washing tower by a fan;

[0009] S2. The tail gas WG3 from the trimethylamine storage tank is transmitted to the scrubbing tower through a pipeline in a closed manner. There are three layers of packing layers with high-efficiency packing above the input pipelines of the tail gas WG1 from the aldehyde recovery tower, the vacuum tail gas WG2, and the tail gas WG3 from the trimethylamine storage tank in the scrubbing tower.

[0010] S4. The liquid at the bottom of the tower in the scrubbing tower is pressurized by a pump and cooled by a cooler, and the cooled liquid is returned to the lower packing layer of the scrubbing tower.

[0011] S7. The washing liquid L1 enters the middle packing layer of the scrubbing tower through a pipeline, and the washing liquid L2 enters the top packing layer of the scrubbing tower through a pipeline.

[0012] S5. The tail gas WG1 from the aldehyde recovery tower, the vacuum tail gas WG2, and the tail gas WG3 from the trimethylamine storage tank that enter the scrubbing tower escape upward from the bottom of the scrubbing tower. During the escape process, the waste gas is washed by the tower bottom liquid, the washing liquid L1, and the washing liquid L2 on the three packing layers respectively, and the purified tail gas is transmitted to the flare system for incineration treatment.

[0013] Preferably, the tail gas WG1 from the aldehyde recovery tower entering the scrubbing tower is continuously discharged, the tail gas pressure is 1 KPag - 10 KPag, the temperature is 25°C - 32°C, and the tail gas transmission flow rate is 400 kg / h ± 5 kg / h.

[0014] Preferably, the vacuum tail gas WG2 entering the scrubbing tower is continuously discharged, the tail gas pressure is 1 KPag - 10 KPag, the temperature is 25°C - 32°C, and the tail gas transmission flow rate is 300 kg / h ± 5 kg / h.

[0015] Preferably, the tail gas WG3 from the trimethylamine storage tank entering the scrubbing tower is intermittently discharged, and the tail gas transmission flow rate is 30 kg / h ± 5 kg / h.

[0016] Preferably, the packing in the packing layer is set as dumped packing, and each packing layer has a packing support for supporting the dumped packing and a packing gland located above the packing.

[0017] Preferably, an on-line pressure gauge for monitoring the system pressure is installed on the packing layer at the top of the scrubbing tower, and the pressure of the on-line pressure gauge is 10 KPag - 20 KPag; an on-line thermometer for monitoring the bottom temperature of the scrubbing tower is installed on the packing layer at the bottom of the scrubbing tower, and the monitored temperature of the on-line thermometer is 35°C - 45.

[0018] Preferably, a remote level gauge for monitoring the bottom level of the tower is provided at the bottom of the scrubbing tower, and the level of the bottom of the scrubbing tower is 30% - 70% of the volume of the bottom part of the tower.

[0019] Preferably, the refrigerant of the cooler is set as circulating water, and the liquid temperature after being cooled by the cooler enters the lower packing layer of the scrubbing tower at 25°C - 30°C.

[0020] Preferably, the scrubbing liquid L1 is composed of 90% water and 10% acetic acid. The flow rate of the scrubbing liquid L1 is 4t / h - 6t / h, the temperature is 25°C - 30°C, and the pressure is 390KPag - 410KPag.

[0021] Preferably, the scrubbing liquid L2 is set as demineralized water. The flow rate of the demineralized water is 1t / h - 2t / h, the temperature is 25°C - 30°C, and the pressure is 390KPag - 410KPag.

[0022] A method for treating waste gas in a neopentyl glycol device proposed by the present invention has the following advantages compared with the prior art:

[0023] The present invention transmits the tail gas WG1 of the aldehyde recovery tower, the vacuum tail gas WG2, and the trimethylamine storage tank tail gas WG3 to the scrubbing tower for scrubbing together. There are three packing layers containing high-efficiency packing in the scrubbing tower. The tower bottom liquid is passed into the lower packing layer, the scrubbing liquid L1 is led to the middle packing layer, and the scrubbing liquid L2 is passed into the top packing layer. The tail gas WG1 of the aldehyde recovery tower, the vacuum tail gas WG2, and the trimethylamine storage tank tail gas WG3 after entering the scrubbing tower escape upward from the bottom of the scrubbing tower. During the escape process, the waste gas is scrubbed by the tower bottom liquid, the scrubbing liquid L1, and the scrubbing liquid L2 on the three packing layers respectively. The purified tail gas is transmitted to the flare system for incineration treatment. By adopting a method of solvent scrubbing and spraying to treat the tail gas of the aldehyde recovery tower, the vacuum tail gas, and the trimethylamine storage tank tail gas in the neopentyl glycol device, the treatment efficiency of the tail gas of the aldehyde recovery tower, the vacuum tail gas, and the trimethylamine storage tank tail gas can be improved, and the normal operation of the neopentyl glycol device can be ensured. Description of the Drawings

[0024] Figure 1 It is a flow block diagram of the present invention;

[0025] Figure 2 It is a schematic structural diagram of the scrubbing tower of the present invention.

[0026] In the figure: 1. Scrubbing tower; 2. Fan; 3. Pump; 4. Cooler. Detailed Embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The specific embodiments described here are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] The present invention provides a method for treating waste gas in a neopentyl glycol device as shown in Figure 1-2 the following, which includes the following steps:

[0029] S1. The tail gas WG1 of the aldehyde recovery tower and the vacuum tail gas WG2 are hermetically collected through pipelines and then sent to the scrubbing tower 1 by a fan 2; the tail gas WG1 of the aldehyde recovery tower entering the scrubbing tower 1 is continuously discharged, the tail gas pressure is 1 KPag - 10 KPag, the temperature is 25°C - 32°C, the tail gas transmission flow rate is 400 kg / h ± 5 kg / h, and the main components of the tail gas WG1 of the aldehyde recovery tower are 33.5% trimethylamine, 2% isobutyraldehyde, and the rest is nitrogen; the tail gas WG1 of the aldehyde recovery tower is hermetically collected through pipelines to the first inlet pipeline of the fan 2.

[0030] The vacuum tail gas WG2 entering the scrubbing tower 1 is continuously discharged, the tail gas pressure is 1 KPag - 10 KPag, the temperature is 25°C - 32°C, the tail gas transmission flow rate is 300 kg / h ± 5 kg / h, and the main component of the vacuum tail gas WG2 is 45.2% trimethylamine, and the rest is nitrogen; the vacuum tail gas WG2 is hermetically collected through pipelines to the first inlet pipeline of the fan 2.

[0031] By using the sealing property of the pipelines and the power of the fan 2, with the outlet pressure of the fan 2 being 30 KPag, the tail gas WG1 of the aldehyde recovery tower and the vacuum tail gas WG2 are collected and transported to the scrubbing tower 1, which can centrally collect the two kinds of tail gases containing pollutants such as trimethylamine, ensure that the tail gas can stably and safely enter the scrubbing tower 1, provide a prerequisite for efficient waste gas treatment, and prevent environmental pollution and safety hazards caused by tail gas leakage.

[0032] S2. The tail gas WG3 of the trimethylamine storage tank is hermetically transmitted through pipelines to the scrubbing tower 1. Above the input pipelines of the tail gas WG1 of the aldehyde recovery tower, the vacuum tail gas WG2, and the tail gas WG3 of the trimethylamine storage tank in the scrubbing tower 1, there are three layers of packing layers containing high-efficiency packing.

[0033] The tail gas WG3 of the trimethylamine storage tank entering the scrubbing tower 1 is intermittently discharged, the tail gas transmission flow rate is 30 kg / h ± 5 kg / h, and the main components of the tail gas WG3 of the trimethylamine storage tank are: 79% trimethylamine, and the rest is nitrogen.

[0034] The packing in the packing layer is set as random packing. Each packing layer has a packing support for supporting the random packing and a packing gland located above the packing. The random packing includes Pall rings, cascade rings, and Intalox saddles. One or more of these random packings are specifically selected according to actual usage requirements. Among them, Pall rings: are obtained by improving the Raschig rings. Two rows of window holes with inward-extending tongue pieces are opened on the ring wall, enabling gas and liquid to pass through the window holes, greatly improving the mass transfer efficiency of the packing and having a relatively small pressure drop. In the scrubber 1, the Pall ring packing can allow the waste gas to come into more sufficient contact with the scrubbing liquid, enhance the absorption effect on pollutants such as trimethylamine, and improve the waste gas treatment efficiency.

[0035] Cascade rings: are a further improvement of the Pall rings. Their height is only half of that of the Pall rings, and one end has a conical flanging. This structure reduces the packing density and increases the void fraction, resulting in higher mass transfer efficiency and smaller pressure drop. In the waste gas treatment of the neopentyl glycol plant, the cascade ring packing can make the gas-liquid distribution more uniform, improve the treatment capacity and separation effect of the scrubber 1, and more effectively remove pollutants in the waste gas.

[0036] Intalox saddles: are an improvement of the arc saddles, with a more regular shape and better structural strength. The performance of the Intalox saddles is superior to that of the arc saddles, having a higher mass transfer efficiency and a lower pressure drop. During the process of treating waste gas in the neopentyl glycol plant, the Intalox saddle packing can reduce the pressure loss of the system while ensuring good gas-liquid contact, and improve the operating stability and economy of the scrubber 1.

[0037] An on-line pressure gauge for monitoring the system pressure is installed in the packing layer at the top of the scrubber 1, and the pressure of the on-line pressure gauge is 10 KPag - 20 KPag; an on-line thermometer for monitoring the bottom temperature of the scrubber 1 is installed in the packing layer at the bottom of the scrubber 1, and the monitored temperature of the on-line thermometer is 35°C - 45°C.

[0038] A remote level gauge for monitoring the tower bottom liquid level is provided at the tower bottom of the scrubber 1, and the liquid level at the tower bottom of the scrubber 1 is 30% - 70% of the volume of the tower bottom part.

[0039] The tail gas WG3 of the trimethylamine storage tank is transported to the scrubbing tower 1 through a pipeline. Since the scrubbing tower 1 is provided with three packing layers containing high-efficiency packing, the dumped packing can increase the gas-liquid contact area; the packing support and gland ensure the stability of the packing. The on-line pressure gauge at the top monitors the system pressure, the on-line thermometer at the bottom monitors the bottom temperature of the tower, and the remote transmission liquid level gauge monitors the liquid level of the tower kettle, so as to control and adjust the operating state of the scrubbing tower 1, enabling the tail gas of the trimethylamine storage tank to enter the scrubbing tower 1 for treatment. The packing layer provides a place for gas-liquid mass transfer, which is conducive to the absorption of pollutants in the waste gas. By monitoring the pressure, temperature and liquid level, it is ensured that the scrubbing tower 1 operates under suitable working conditions, guaranteeing the treatment effect and equipment safety, realizing the collection and treatment of the tail gas of the trimethylamine storage tank. The setting of the packing layer improves the contact efficiency between the waste gas and the washing liquid, enabling the pollutants in the waste gas to be more fully absorbed. The monitoring device can timely detect abnormal situations and make adjustments to ensure the stable operation of the scrubbing tower 1.

[0040] S3. The liquid in the tower kettle of the scrubbing tower 1 is pressurized by the pump 3 and then cooled by the cooler 4, and the cooled liquid is returned to the lower packing layer of the scrubbing tower 1; the refrigerant of the cooler 4 is set as circulating water, and the temperature of the liquid after being cooled by the cooler 4 is 25°C - 30°C and then enters the lower packing layer of the scrubbing tower 1. The liquid in the tower kettle of the scrubbing tower 1 is pressurized by the pump 3, and the circulating water in the cooler 4 is used to cool the liquid to 25°C - 30°C and then return to the lower packing layer of the scrubbing tower 1. The pressurized tower kettle liquid can be better distributed and flow in the packing layer, improving the mass transfer efficiency. The temperature of the cooled liquid decreases, which is conducive to improving the absorption effect of pollutants in the waste gas, because generally, the decrease in temperature will increase the solubility of gas in the liquid, enhancing the absorption capacity of the tower kettle liquid for pollutants in the waste gas and improving the washing effect, thereby improving the efficiency of the entire waste gas treatment system.

[0041] S4. The washing liquid L1 enters the middle packing layer of the scrubbing tower 1 through a pipeline, and the washing liquid L2 enters the top packing layer of the scrubbing tower 1 through a pipeline;

[0042] The washing liquid L1 is composed of 90% water and 10% acetic acid. The flow rate of the washing liquid L1 is 4t / h - 6t / h, the temperature is 25°C - 30°C, and the pressure is 390KPag - 410KPag; the washing liquid L2 is set as demineralized water, the flow rate of the demineralized water is 1t / h - 2t / h, the temperature is 25°C - 30°C, and the pressure is 390KPag - 410KPag. Demineralized water is water that has been treated to remove most of the dissolved salts (strong electrolytes), and its core feature is extremely low salt content, usually between 1 and 5 milligrams per liter.

[0043] Through the neutralization reaction between acetic acid in the washing liquid L1 and alkaline gases such as trimethylamine in the waste gas, water plays a role in dissolving other soluble pollutants, thereby removing pollutants in the waste gas. The washing liquid L2, as demineralized water, further washes and purifies the waste gas to remove residual pollutants and possible entrained impurities. By washing the waste gas with two different washing liquids at different positions, it is possible to more comprehensively and effectively remove pollutants such as trimethylamine and isobutyraldehyde in the waste gas, and improve the purification degree of the waste gas.

[0044] S5. The tail gas WG1 of the aldehyde recovery tower, the vacuum tail gas WG2, and the trimethylamine storage tank tail gas WG3 after entering the washing tower 1 escape upward from the bottom of the washing tower. During the escape process, the waste gas is washed by the tower bottom liquid, the washing liquid L1, and the washing liquid L2 on three packing layers respectively. The purified tail gas is transmitted to the flare system for incineration treatment. Using the countercurrent principle of upward gas flow and downward liquid flow, the gas-liquid is fully contacted to improve the absorption efficiency of pollutants; the incineration treatment of the flare system further ensures that harmful substances in the tail gas are completely decomposed, achieving the purpose of harmless emission. After multi-layer washing and incineration treatment, pollutants in the waste gas are effectively removed, and the purified tail gas meets the environmental protection emission standards, reducing environmental pollution and ensuring the normal operation of the neopentyl glycol plant. The surplus washing liquid is sent to the wastewater treatment system for wastewater treatment through a pipeline controlled by the liquid level of the bottom of the washing tower 1.

[0045] Among them, the flare system usually consists of parts such as a flare tip, a flare barrel, an ignition system, a sealing system, a liquid separation tank, and a water seal tank. The flare system heats the tail gas to a high enough temperature to enable the harmful substances in it to undergo a combustion reaction and be converted into harmless substances such as carbon dioxide and water. Generally, the combustion temperature of the flare can reach 800°C - 1200°C or even higher. In such a high-temperature environment, most organic pollutants and harmful gases can be quickly decomposed. For example, organic compounds such as trimethylamine in the tail gas undergo an oxidation reaction with oxygen in the air at high temperature and finally generate harmless products such as carbon dioxide and water.

[0046] The flare system is designed with an appropriate flare barrel height and gas flow velocity to ensure that the tail gas has enough residence time in the flare for the combustion reaction. Usually, the residence time of the tail gas in the flare barrel is optimized according to factors such as the composition, flow rate of the tail gas, and characteristics of the combustion reaction, generally ranging from several seconds to dozens of seconds. This can ensure that harmful substances are fully contacted with oxygen and react in a high-temperature environment, thus achieving complete decomposition.

[0047] In summary, by jointly transporting the tail gas WG1 of the aldehyde recovery tower, the vacuum tail gas WG2, and the tail gas WG3 of the trimethylamine storage tank to the scrubber 1 for scrubbing, three packing layers containing high-efficiency packing are arranged in the scrubber 1. The bottom liquid of the tower is introduced into the lower packing layer, the scrubbing liquid L1 is led to the middle packing layer, and the scrubbing liquid L2 is introduced into the top packing layer. The tail gas WG1 of the aldehyde recovery tower, the vacuum tail gas WG2, and the tail gas WG3 of the trimethylamine storage tank that enter the scrubber 1 escape upward from the bottom of the scrubber. During the escape process, the waste gas is scrubbed by the bottom liquid of the tower, the scrubbing liquid L1, and the scrubbing liquid L2 on the three packing layers respectively. The purified tail gas is transported to the flare system for incineration treatment. By adopting a method of solvent scrubbing and spraying to treat the tail gas of the aldehyde recovery tower, the vacuum tail gas, and the tail gas of the trimethylamine storage tank in the neopentyl glycol plant, the treatment efficiency of the tail gas of the aldehyde recovery tower, the vacuum tail gas, and the tail gas of the trimethylamine storage tank can be improved, and the normal operation of the neopentyl glycol plant can be ensured.

[0048] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for treating waste gas from a neopentyl glycol device, characterized in that: The steps include: S1, aldehyde recovery tower tail gas WG1 and vacuum tail gas WG2 are collected in a closed pipeline and then sent to the washing tower through a fan; S2, trimethylamine storage tank tail gas WG3 is transmitted to the washing tower through a closed pipeline. The washing tower is located above the input pipelines of the aldehyde recovery tower tail gas WG1, the vacuum tail gas WG2 and the trimethylamine storage tank tail gas WG3, and is provided with three layers of packing layers containing high-efficiency packing; S3, the liquid in the bottom of the washing tower is pressurized by a pump and then cooled by a cooler, and the cooled liquid is returned to the packing layer at the bottom of the washing tower; S4, washing liquid L1 enters the middle packing layer of the washing tower through the pipeline, and washing liquid L2 enters the top packing layer of the washing tower through the pipeline; S5. After entering the washing tower, the aldehyde recovery tower tail gas WG1, vacuum tail gas WG2 and trimethylamine storage tank tail gas WG3 escape from the bottom of the washing tower upward. During the escape process, the exhaust gas is washed by the bottom liquid, washing liquid L1 and washing liquid L2 on the three packing layers respectively. The purified tail gas is transmitted to the flare system for incineration treatment.

2. The method for treating waste gas from a neopentyl glycol device according to claim 1, characterized in that: The tail gas WG1 of the aldehyde recovery tower entering the washing tower is discharged continuously, the tail gas pressure is 1KPag-10KPag, the temperature is 25°C-32°C, and the tail gas transmission flow rate is 400kg / h±5kg / h.

3. The method for treating waste gas from a neopentyl glycol device according to claim 2, characterized in that: The vacuum tail gas WG2 entering the washing tower is discharged continuously, the tail gas pressure is 1KPag-10KPag, the temperature is 25℃-32℃, and the tail gas transmission flow rate is 300kg / h±5kg / h.

4. The method for treating waste gas from a neopentyl glycol device according to claim 3, characterized in that: The tail gas WG3 from the trimethylamine storage tank entering the washing tower is discharged intermittently, and the tail gas transmission flow rate is 30kg / h±5kg / h.

5. The method for treating waste gas from a neopentyl glycol device according to claim 4, characterized in that: The packing in the packing layer is arranged as random packing, and each packing layer has a packing support for supporting the random packing and a packing gland located on the top of the packing.

6. The method for treating waste gas from a neopentyl glycol device according to claim 5, characterized in that: The packing layer at the top of the washing tower is equipped with an online pressure gauge for monitoring the system pressure, and the pressure of the online pressure gauge is 10KPag-20KPag; the packing layer at the bottom of the washing tower is equipped with an online thermometer for monitoring the bottom temperature of the washing tower, and the monitoring temperature of the online thermometer is 35℃-45℃.

7. The method for treating waste gas from a neopentyl glycol device according to claim 6, characterized in that: The tower kettle of the washing tower is provided with a remote liquid level meter for monitoring the liquid level of the tower kettle. The liquid level of the tower kettle of the washing tower is 30%-70% of the volume of the tower kettle.

8. The method for treating waste gas from a neopentyl glycol device according to claim 7, characterized in that: The refrigerant of the cooler is set as circulating water, and the liquid temperature after cooling by the cooler is 25°C-30°C before entering the lower packing layer of the washing tower.

9. The method for treating waste gas from a neopentyl glycol device according to claim 8, characterized in that: The washing liquid L1 is composed of 90% water and 10% acetic acid, and the flow rate of the washing liquid L1 is 4t / h-6t / h, the temperature is 25°C-30°C, and the pressure is 390KPag-410KPag.

10. The method for treating waste gas from a neopentyl glycol device according to claim 9, characterized in that: The washing liquid L2 is set to be desalted water, the flow rate of desalted water is 1t / h-2t / h, the temperature is 25°C-30°C, and the pressure is 390KPag-410KPag.

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