Method and system for quantitatively removing VOC (Volatile Organic Compounds) from emulsion

Abstract

The invention discloses a method and a system for quantitatively removing VOC (Volatile Organic Compounds) from emulsion. The system comprises a stripping tower, a VOC removal control module, an emulsion feeding flow control module and a steam feeding flow control module, the emulsion feeding flow control module controls to convey emulsion to the stripping tower according to Qy, the VOC removal control module analyzes according to the emulsion feeding flow Qy to obtain target steam feeding flow Qs, and the steam feeding flow control module controls to convey steam to the stripping tower according to Qs so as to carry out stripping VOC removal treatment. According to the method, the relation curve of the gas-liquid ratio and the VOC removal efficiency is obtained through experimental fitting in advance, then the steam feeding flow is controlled by combining the emulsion flow, so that the required VOC removal efficiency is achieved, the VOC value of the product can be controlled, the product can be subjected to hierarchical control more meticulously, energy waste caused by using excessive steam is avoided, and the product quality is improved. Wide market application prospects are realized.

Description

Technical Field

[0001] The invention relates to the technical field of VOC removal from polymer emulsions, and in particular to a method and system for quantitatively removing VOC from an emulsion. Background Art

[0002] Polymer emulsion is a colloidal solution formed by polymer particles dispersed in water. It is widely used in coatings, adhesives, textiles, paper processing and other fields. Polymer emulsion is usually prepared from monomers through emulsion polymerization. Since the product contains a certain amount of unreacted monomers and other volatile solvents as well as small organic molecules produced by side reactions, these substances will be released in the form of VOCs after the polymerization reaction. These volatile substances need to be removed through effective methods to reduce their impact on the environment and human health.

[0003] At present, steam stripping has been widely used in industrial production as an effective VOC removal process. The stripping tower separates VOC from the exhaust gas by utilizing the thermal energy of steam, thereby achieving the purpose of purifying the exhaust gas. For example, patent CN105169730A discloses a method and device for removing VOC from acrylic emulsion, in which the acrylic emulsion is preheated and passed into an evaporator, and a mixture of water vapor and inert gas is passed into the evaporator to remove VOC, thereby obtaining a finished acrylic emulsion. However, this method only introduces how to reduce the VOC of the product, without introducing a specific control scheme in detail, and does not further grade the VOC value of the product, which is not conducive to the control and prediction of the VOC of the product.

[0004] The existing method of removing VOC from emulsion by steam stripping cannot quantitatively control the VOC of the product and can only obtain products with a single VOC value. It does not meet the requirements of obtaining products with different VOC grades in actual production. In addition, all feed amounts are input by the operator, which is cumbersome and not conducive to controlling product quality. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method and system for quantitatively removing VOC from an emulsion in view of the deficiencies in the above-mentioned prior art.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: In a first aspect of the present invention, a method for quantitatively removing VOC from an emulsion is provided, comprising the following steps:

[0007] S1. Construct the relationship curve between gas-liquid ratio and VOC removal efficiency f x :

[0008] S1-1. Detect the VOC content of the emulsion to be treated, record it as C0, pass the steam and the emulsion to be treated into the stripping tower for stripping and VOC removal, maintain the emulsion feed flow rate unchanged, adjust the steam feed flow rate to achieve different gas-liquid ratios and record them, collect the products obtained under different gas-liquid ratios, and detect the VOC content of the products, record it as C1, and calculate the VOC removal efficiency η of the emulsion B :

[0009] η B =(C0-C0) / C0*100%;

[0010] Wherein, gas-liquid ratio = steam feed flow rate: emulsion feed flow rate;

[0011] S1-2, with the gas-liquid ratio as the horizontal axis and the VOC removal efficiency η as the vertical axis, curve fitting is performed to obtain the relationship curve f between the gas-liquid ratio of the current working liquid and the VOC removal efficiency x ;

[0012] S2. Remove VOC from the emulsion:

[0013] S2-1. Determine the initial VOC content of the emulsion to be treated, and calculate the target VOC removal efficiency η according to the target VOC content required for the emulsion:

[0014] η = (initial VOC content - product VOC content) / initial VOC content * 100%;

[0015] S2-2, according to the target VOC removal efficiency η, using the relationship curve fx constructed in step S1 to calculate the target gas-liquid ratio K required to reach the target VOC removal efficiency η;

[0016] S2-3. Calculate the required target steam feed flow rate Qs according to the emulsion feed flow rate Qy and the target gas-liquid ratio K:

[0017] Qs=Qy*K;

[0018] S2-4, conveying the emulsion to the stripping tower at an emulsion feed rate of Qy, conveying the steam to the stripping tower at a steam feed rate of Qs, and performing stripping and VOC removal treatment.

[0019] Preferably, in step S1-1, at least 5 groups of data with different gas-liquid ratios are tested.

[0020] Preferably, in step S1-1, the temperature of the emulsion when introduced is controlled at 60-90°C, the temperature of the steam when introduced is controlled at 80-120°C, and the tower is under negative pressure, with a pressure of -30 to -50 kPa.

[0021] Preferably, in step S2, the temperature of the emulsion when introduced, the temperature of the steam when introduced, and the pressure in the stripping tower are kept the same as those in step S1-1.

[0022] Preferably, in step S2, the target VOC content is 400-1200 ppm.

[0023] Preferably, the emulsion is a polymer emulsion having a viscosity of less than 1500 mpas at room temperature and obtained by emulsion polymerization.

[0024] Preferably, the emulsion is any one of polyacrylate emulsion, polyurethane emulsion, styrene acrylic emulsion and water-based alkyd emulsion.

[0025] In a second aspect of the present invention, a system for quantitatively removing VOC from an emulsion is provided, which adopts the method as described above to perform emulsion stripping and VOC removal treatment, and the system comprises: a stripping tower, a VOC removal control module, an emulsion feed flow control module connected to the VOC removal control module, and a steam feed flow control module connected to the VOC removal control module;

[0026] The emulsion feed flow control module controls the emulsion to be delivered to the stripping tower according to the emulsion feed flow rate Qy, the VOC removal control module obtains the target steam feed flow rate Qs according to the emulsion feed flow rate Qy analysis, and the steam feed flow control module controls the steam to be delivered to the stripping tower according to the steam feed flow rate Qs to perform stripping and VOC removal treatment.

[0027] Preferably, the stripping tower has a diameter of 150-600 mm and a height of 5-20 m. The tower is equipped with stainless steel mesh corrugated packing. The emulsion is introduced from the upper part of the stripping tower, and the steam is introduced from the bottom of the stripping tower through a sprayer. VOC leaves the stripping tower from the top of the stripping tower along with part of the steam, and the emulsion product after VOC removal is collected at the bottom of the stripping tower.

[0028] Preferably, the emulsion feed flow rate is controlled to be 100-300 kg / h.

[0029] The beneficial effects of the present invention are:

[0030] The present invention provides a method and system for quantitatively removing VOC from an emulsion. The present invention obtains a relationship curve between the gas-liquid ratio and the VOC removal efficiency through preliminary experimental fitting, and then controls the steam feed flow rate in combination with the emulsion flow rate to achieve the required VOC removal efficiency. The VOC value of the product can be controlled, thereby more finely controlling the graded products and avoiding energy waste caused by using too much steam. The present invention has broad market application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the control principle of the system for quantitatively removing VOC from an emulsion of the present invention;

[0032] Figure 2 It is a schematic diagram of the working principle of the stripping tower of the present invention;

[0033] Figure 3 The relationship curve f between gas-liquid ratio and VOC removal efficiency constructed in Example 1 xA ;

[0034] Figure 4 The relationship curve f between gas-liquid ratio and VOC removal efficiency constructed in Example 2 xB . DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with embodiments so that those skilled in the art can implement the invention with reference to the description.

[0036] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0037] The test methods used in the following examples are conventional methods unless otherwise specified. The materials and reagents used in the following examples are all commercially available unless otherwise specified. In the following examples, if no specific conditions are specified, the experiments were carried out under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used, if the manufacturer is not specified, are all conventional products that can be purchased commercially.

[0038] The present invention provides a method for quantitatively removing VOC from an emulsion, comprising the following steps:

[0039] S1. Construct the relationship curve between gas-liquid ratio and VOC removal efficiency f x :

[0040] S1-1. Detect the VOC content of the emulsion to be treated, record it as C0, pass the steam and the emulsion to be treated into the stripping tower for stripping and VOC removal, maintain the emulsion feed flow rate unchanged, adjust the steam feed flow rate to achieve different gas-liquid ratios and record them, collect the products obtained under different gas-liquid ratios, and detect the VOC content of the products, record it as C1, and calculate the VOC removal efficiency η of the emulsion B :

[0041] η B =(C0-C0) / C0*100%;

[0042] Wherein, gas-liquid ratio = steam feed flow rate: emulsion feed flow rate;

[0043] S1-2, with the gas-liquid ratio as the horizontal axis and the VOC removal efficiency η as the vertical axis, curve fitting is performed to obtain the relationship curve f between the gas-liquid ratio of the current working liquid and the VOC removal efficiencyx ;

[0044] During the stripping process, steam acts as a carrier and provides heat energy for the emulsion. The larger the gas-liquid ratio, the larger the contact area between steam and emulsion. The same mass of emulsion obtains more heat energy, which increases the gasification rate of VOC. The VOC removal efficiency is positively correlated with the gas-liquid ratio.

[0045] S2. Remove VOC from the emulsion:

[0046] S2-1. Determine the initial VOC content of the emulsion to be treated, and calculate the target VOC removal efficiency η according to the target VOC content required for the emulsion:

[0047] η=(initial VOC content-product VOC content) / initial VOC content*100%;

[0048] S2-2, according to the target VOC removal efficiency η, using the relationship curve fx constructed in step S1 to calculate the target gas-liquid ratio K required to reach the target VOC removal efficiency η;

[0049] S2-3. Calculate the required target steam feed flow rate Qs according to the emulsion feed flow rate Qy and the target gas-liquid ratio K:

[0050] Qs=Qy*K;

[0051] S2-4, conveying the emulsion to the stripping tower at an emulsion feed rate of Qy, conveying the steam to the stripping tower at a steam feed rate of Qs, and performing stripping and VOC removal treatment.

[0052] In a preferred embodiment, in step S1-1, at least 5 groups of data with different gas-liquid ratios are tested.

[0053] In a preferred embodiment, in step S1-1, the temperature of the emulsion when introduced is controlled at 60-90°C, the temperature of the steam when introduced is controlled at 80-120°C, and the tower is under negative pressure, with a pressure of -30 to -50 kPa.

[0054] In a preferred embodiment, in step S2, the temperature of the emulsion when introduced, the temperature of the steam when introduced, and the pressure in the stripping tower are all maintained the same as those in step S1-1.

[0055] In a preferred embodiment, in step S2, the target VOC content is 400-1200 ppm.

[0056] When testing the VOC content of the emulsion, three groups were tested in parallel and the average value was taken.

[0057] In a preferred embodiment, the emulsion is a polymer emulsion having a viscosity of less than 1500 mpas at room temperature and obtained by emulsion polymerization.

[0058] In a preferred embodiment, the emulsion is any one of polyacrylate emulsion, polyurethane emulsion, styrene acrylic emulsion, and water-based alkyd emulsion.

[0059] Reference Figure 1-2 , the present invention also provides a system for quantitatively removing VOC from an emulsion, which adopts the above method to carry out emulsion stripping and VOC removal treatment, the system comprising: a stripping tower, a VOC removal control module, an emulsion feed flow control module connected to the VOC removal control module, and a steam feed flow control module connected to the VOC removal control module;

[0060] The VOC removal control module calculates the ratio of the emulsion feed flow rate and the steam feed flow rate. The emulsion feed flow rate control module controls the emulsion to be delivered to the stripping tower according to the emulsion feed flow rate Qy (the emulsion amount is adjusted by the emulsion flow valve). The VOC removal control module obtains the target steam feed flow rate Qs (the steam amount is adjusted by the steam flow valve) according to the emulsion feed flow rate Qy analysis. The steam feed flow rate control module controls the steam to be delivered to the stripping tower according to the steam feed flow rate Qs for stripping VOC removal treatment without manual adjustment of the steam feed.

[0061] In a preferred embodiment, the stripping tower has a diameter of 150-600 mm and a height of 5-20 m. The tower is equipped with stainless steel mesh corrugated packing. The emulsion is introduced from the upper part of the stripping tower, and the steam is introduced from the bottom of the stripping tower through a sprayer. VOC leaves the stripping tower from the top of the stripping tower along with part of the steam, and the emulsion product after VOC removal is collected at the bottom of the stripping tower.

[0062] The selection of the emulsion feed flow rate is related to the structure and design of the stripping tower. Different stripping towers have different feed flow rate ranges. In a preferred embodiment, the emulsion feed flow rate is controlled to be 100-300 kg / h.

[0063] The above is the overall concept of the present invention, and detailed embodiments and comparative examples are provided below on the basis of the overall concept of the present invention to further illustrate the present invention.

[0064] Example 1

[0065] A system for quantitatively removing VOC from an emulsion, the system comprising: a stripping tower, a VOC removal control module, an emulsion feed flow control module connected to the VOC removal control module, and a steam feed flow control module connected to the VOC removal control module;

[0066] The emulsion feed flow control module controls the delivery of emulsion to the stripping tower according to the emulsion feed flow rate Qy. The VOC removal control module obtains the target steam feed flow rate Qs based on the emulsion feed flow rate Qy. The steam feed flow control module controls the delivery of steam to the stripping tower according to the steam feed flow rate Qs to perform stripping and VOC removal treatment.

[0067] The stripping tower has a diameter of 300 mm and a height of 10 m. It is equipped with stainless steel mesh corrugated packing. The emulsion is introduced from the upper part of the stripping tower, and the steam is introduced from the bottom of the stripping tower through the sprayer. VOC leaves the stripping tower from the top of the stripping tower along with part of the steam, and the emulsion product after VOC removal is collected at the bottom of the stripping tower.

[0068] The method for quantitatively removing VOC from emulsion using the system comprises the following steps:

[0069] S1. Construct the relationship curve between gas-liquid ratio and VOC removal efficiency f xA :

[0070] S1-1. Select the emulsion to be treated: polyacrylate emulsion, the viscosity test result at room temperature is 520mpas, test its VOC content 3 times, take the average value as the initial VOC content, recorded as C0;

[0071] The steam and the emulsion to be treated are passed into the stripping tower for stripping and VOC removal. The temperature of the emulsion when it is passed in is 62°C, the temperature of the steam when it is passed in is 85°C, and the pressure in the stripping tower is -32.5kPa.

[0072] The emulsion feed flow rate was maintained at 200 kg / h, and the steam feed flow rate was adjusted to achieve different gas-liquid ratios and recorded. Specifically, the steam flow rates were set to 16.7, 20, 25, 33.3, and 50 kg / h, and the emulsion feed flow rate was kept constant. The corresponding gas-liquid ratios were 1 / 12, 1 / 10, 1 / 8, 1 / 6, and 1 / 4, respectively. The products obtained under different gas-liquid ratios were collected, about 20 kg each time, and a total of 5 samples were collected. Each product was tested for VOC content 3 times, and the average value was taken as the VOC content of the product, recorded as C1, and the VOC removal efficiency η of the emulsion was calculated. B :

[0073] η B =(C0-C0) / C0*100%;

[0074] Wherein, gas-liquid ratio = steam feed flow rate: emulsion feed flow rate;

[0075] S1-2, with the gas-liquid ratio as the horizontal axis and the VOC removal efficiency η as the vertical axis, curve fitting is performed to obtain the relationship curve f between the gas-liquid ratio of the current working liquid and the VOC removal efficiency xA , the relationship curve is as follows Figure 3 As shown;

[0076] S2. Remove VOC from the emulsion:

[0077] S2-1, the initial VOC content of the emulsion to be treated, the target VOC content of the emulsion, the emulsion feed flow rate Qy, the relationship curve fxA Input into the VOC removal control module;

[0078] The VOC removal control module calculates the target VOC removal efficiency η according to the initial VOC content of the emulsion to be treated and the target VOC content required by the emulsion:

[0079] η = (initial VOC content - product VOC content) / initial VOC content * 100%;

[0080] In this embodiment, the target VOC content is set to 1200 ppm;

[0081] S2-2, the VOC removal control module calculates the target gas-liquid ratio K required to reach the target VOC removal efficiency η according to the target VOC removal efficiency η using the relationship curve fx constructed in step S1;

[0082] S2-3, the VOC removal control module calculates the required target steam feed flow Qs according to the emulsion feed flow Qy and the target gas-liquid ratio K:

[0083] Qs=Qy*K;

[0084] In this embodiment, the emulsion feed flow rate is 200 kg / h when VOC removal is performed;

[0085] S2-4, the emulsion feed flow control module controls the emulsion to be delivered to the stripping tower according to the emulsion feed flow rate Qy, and the steam feed flow control module controls the steam to be delivered to the stripping tower according to the steam feed flow rate Qs, and performs stripping and VOC removal treatment. The temperature of the emulsion when it is introduced, the temperature of the steam when it is introduced, and the pressure in the stripping tower are kept the same as in step S1-1.

[0086] The VOC content of the emulsion product after VOC removal was tested twice, and the average value was taken as the VOC content result of the product in this example.

[0087] Example 2

[0088] This example is basically the same as Example 1, except that:

[0089] In this example, the target VOC content is set to 400 ppm; in step S2, the emulsion feed flow rate is controlled to 300 kg / h during VOC removal.

[0090] The VOC content of the emulsion product after VOC removal was tested twice, and the average value was taken as the VOC content result of the product in this example.

[0091] Example 3

[0092] A system for quantitatively removing VOC from an emulsion, the system comprising: a stripping tower, a VOC removal control module, an emulsion feed flow control module connected to the VOC removal control module, and a steam feed flow control module connected to the VOC removal control module;

[0093] The emulsion feed flow control module controls the delivery of emulsion to the stripping tower according to the emulsion feed flow rate Qy. The VOC removal control module obtains the target steam feed flow rate Qs based on the emulsion feed flow rate Qy. The steam feed flow control module controls the delivery of steam to the stripping tower according to the steam feed flow rate Qs to perform stripping and VOC removal treatment.

[0094] The stripping tower has a diameter of 300 mm and a height of 10 m. It is equipped with stainless steel mesh corrugated packing. The emulsion is introduced from the upper part of the stripping tower, and the steam is introduced from the bottom of the stripping tower through the sprayer. VOC leaves the stripping tower from the top of the stripping tower along with part of the steam, and the emulsion product after VOC removal is collected at the bottom of the stripping tower.

[0095] The method for quantitatively removing VOC from emulsion using the system comprises the following steps:

[0096] S1. Construct the relationship curve between gas-liquid ratio and VOC removal efficiency f xB :

[0097] S1-1. Select the emulsion to be treated: polyurethane emulsion, the viscosity test result at room temperature is 1372mpas, test its VOC content 3 times, take the average value as the initial VOC content, recorded as C0;

[0098] The steam and the emulsion to be treated are introduced into a stripping tower for stripping and VOC removal. The temperature of the emulsion when introduced is 80°C, the temperature of the steam when introduced is 106°C, and the pressure in the stripping tower is -45.2 kPa.

[0099] The emulsion feed flow rate was maintained at 200 kg / h, and the steam feed flow rate was adjusted to achieve different gas-liquid ratios and recorded. Specifically, the steam flow rates were set to 16.7, 20, 25, 33.3, and 50 kg / h, and the emulsion feed flow rate was kept constant. The corresponding gas-liquid ratios were 1 / 12, 1 / 10, 1 / 8, 1 / 6, and 1 / 4, respectively. The products obtained under different gas-liquid ratios were collected, about 20 kg each time, and a total of 5 samples were collected. Each product was tested for VOC content 3 times, and the average value was taken as the VOC content of the product, recorded as C1, and the VOC removal efficiency η of the emulsion was calculated. B :

[0100] η B =(C0-C0) / C0*100%;

[0101] Wherein, gas-liquid ratio = steam feed flow rate: emulsion feed flow rate;

[0102] S1-2, with the gas-liquid ratio as the horizontal axis and the VOC removal efficiency η as the vertical axis, curve fitting is performed to obtain the relationship curve f between the gas-liquid ratio of the current working liquid and the VOC removal efficiency xB , the relationship curve is as follows Figure 4 As shown;

[0103] S2. Remove VOC from the emulsion:

[0104] S2-1, the initial VOC content of the emulsion to be treated, the target VOC content of the emulsion, the emulsion feed flow rate Qy, the relationship curve f xA Input into the VOC removal control module;

[0105] The VOC removal control module calculates the target VOC removal efficiency η according to the initial VOC content of the emulsion to be treated and the target VOC content required by the emulsion:

[0106] η = (initial VOC content - product VOC content) / initial VOC content * 100%;

[0107] In this embodiment, the target VOC content is set to 800 ppm;

[0108] S2-2, the VOC removal control module calculates the target gas-liquid ratio K required to reach the target VOC removal efficiency η according to the target VOC removal efficiency η using the relationship curve fx constructed in step S1;

[0109] S2-3, the VOC removal control module calculates the required target steam feed flow Qs according to the emulsion feed flow Qy and the target gas-liquid ratio K:

[0110] Qs=Qy*K;

[0111] In this embodiment, the emulsion feed flow rate is 100 kg / h when VOC removal is performed;

[0112] S2-4, the emulsion feed flow control module controls the emulsion to be delivered to the stripping tower according to the emulsion feed flow rate Qy, and the steam feed flow control module controls the steam to be delivered to the stripping tower according to the steam feed flow rate Qs, and performs stripping and VOC removal treatment. The temperature of the emulsion when it is introduced, the temperature of the steam when it is introduced, and the pressure in the stripping tower are kept the same as in step S1-1.

[0113] The VOC content of the emulsion product after VOC removal was tested twice, and the average value was taken as the VOC content result of the product in this example.

[0114] The VOC content results of the products of Examples 1-3 are shown in Table 1 below:

[0115] Table 1

[0116] Example 1 Example 2 Example 3 Initial VOC 1836 1836 2035 Target VOC 1200 300 800 Product VOC 1165 389 797

[0117] Note: The unit in the table is ppm.

[0118] According to the test results of Examples 1-3, it can be seen that the final VOC content of the product is close to the target VOC content, and the difference is within ±100 ppm, which means that the present invention can quantitatively control the VOC content of the product to achieve the desired different VOC levels.

[0119] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to specific details.

Claims

1. A method for quantitatively removing VOC from an emulsion, characterized in that: The following steps are involved: S1. Construct the relationship curve between gas-liquid ratio and VOC removal efficiency f x : S1-1. Detect the VOC content of the emulsion to be treated, record it as C0, pass the steam and the emulsion to be treated into the stripping tower for stripping and VOC removal, maintain the emulsion feed flow rate unchanged, adjust the steam feed flow rate to achieve different gas-liquid ratios and record them, collect the products obtained under different gas-liquid ratios, and detect the VOC content of the products, record it as C1, and calculate the VOC removal efficiency η of the emulsion B : or B =(C0-C) / C0*100%; Wherein, gas-liquid ratio = steam feed flow rate: emulsion feed flow rate; S1-2, with the gas-liquid ratio as the horizontal axis and the VOC removal efficiency η as the vertical axis, curve fitting is performed to obtain the relationship curve f between the gas-liquid ratio of the current working liquid and the VOC removal efficiency x ; S2. Remove VOC from the emulsion: S2-1. Determine the initial VOC content of the emulsion to be treated, and calculate the target VOC removal efficiency η according to the target VOC content required for the emulsion: η=(initial VOC content-product VOC content) / initial VOC content*100%; S2-2, according to the target VOC removal efficiency η, using the relationship curve fx constructed in step S1 to calculate the target gas-liquid ratio K required to reach the target VOC removal efficiency η; S2-3. Calculate the required target steam feed flow rate Qs according to the emulsion feed flow rate Qy and the target gas-liquid ratio K: Qs=Qy*K; S2-4, conveying the emulsion to the stripping tower at an emulsion feed rate of Qy, conveying the steam to the stripping tower at a steam feed rate of Qs, and performing stripping and VOC removal treatment.

2. The method for quantitatively removing VOC from an emulsion according to claim 1, characterized in that: In step S1-1, at least 5 groups of data with different gas-liquid ratios are tested.

3. The method for quantitatively removing VOC from an emulsion according to claim 1, characterized in that: In step S1-1, the temperature of the emulsion when introduced is controlled at 60-90°C, the temperature of the steam when introduced is controlled at 80-120°C, and the tower is under negative pressure, with a pressure of -30 to -50 kPa.

4. The method for quantitatively removing VOC from an emulsion according to claim 3, characterized in that: In step S2, the temperature of the emulsion when introduced, the temperature of the steam when introduced, and the pressure in the stripping tower are maintained the same as those in step S1-1.

5. The method for quantitatively removing VOC from an emulsion according to claim 1, characterized in that: In step S2, the target VOC content is 400-1200 ppm.

6. The method for quantitatively removing VOC from an emulsion according to claim 1, characterized in that: The emulsion is a polymer emulsion having a viscosity of less than 1500 mpas at room temperature and obtained by emulsion polymerization.

7. The method for quantitatively removing VOC from an emulsion according to claim 6, characterized in that: The emulsion is any one of polyacrylate emulsion, polyurethane emulsion, styrene acrylic emulsion and water-based alkyd emulsion.

8. A system for quantitatively removing VOC from an emulsion, characterized in that: The method according to any one of claims 1 to 7 is used to carry out emulsion stripping VOC removal treatment, the system comprising: a stripping tower, a VOC removal control module, an emulsion feed flow control module connected to the VOC removal control module, and a steam feed flow control module connected to the VOC removal control module; The emulsion feed flow control module controls the emulsion to be delivered to the stripping tower according to the emulsion feed flow rate Qy, the VOC removal control module obtains the target steam feed flow rate Qs according to the emulsion feed flow rate Qy analysis, and the steam feed flow control module controls the steam to be delivered to the stripping tower according to the steam feed flow rate Qs to perform stripping and VOC removal treatment.

9. The system for quantitatively removing VOC from emulsion according to claim 8, characterized in that: The stripping tower has a diameter of 150-600mm and a height of 5-20m. The tower is equipped with stainless steel mesh corrugated packing. The emulsion is introduced from the top of the stripping tower, and the steam is introduced from the bottom of the stripping tower through the sprayer. VOC leaves the stripping tower from the top of the stripping tower along with part of the steam, and the emulsion product after VOC removal is collected at the bottom of the stripping tower.

10. The system for quantitatively removing VOC from emulsion according to claim 9, characterized in that: The emulsion feed flow rate is controlled at 100-300 kg / h.

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