Copper-clad plate waste gas recovery method

Abstract

The invention provides a copper-clad plate waste gas recovery method, and belongs to the technical field of waste gas treatment. The recovery method of the copper-clad plate waste gas comprises the following steps: carrying out first reverse contact on the copper-clad plate waste gas and a first solvent to obtain first tail gas; performing second reverse contact on the first tail gas and a second solvent to obtain second tail gas; carrying out third reverse contact on the second tail gas and water to obtain wastewater; the first solvent and the second solvent independently comprise at least one of ethylene glycol diacetate, N-methyl pyrrolidone, propylene glycol monomethyl ether and dimethyl sulfoxide. According to the invention, based on the principle of similar intermiscibility, the organic components in the copper-clad plate waste gas can be absorbed by adopting the two-stage solvent, and the organic components in the copper-clad plate waste gas are converted into a liquid state from a gaseous state, so that a foundation is laid for subsequent separation and purification; and then water is adopted for absorption, so that all impurity components in the copper-clad plate waste gas can be absorbed into the water, and environment-friendly recovery of the copper-clad plate waste gas is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of waste gas treatment, and in particular relates to a method for recovering waste gas from a copper clad laminate. Background Art

[0002] A large amount of organic waste gas (main components: acetone, propylene glycol methyl ether, butanone, cyclohexanone, dimethylformamide, etc.) is generated during the drying process of copper clad laminates. At present, the waste gas is mainly treated by incineration, and the heat from the incineration is used to heat the thermal oil and then reused for oven heating. In this way, the combustion of waste gas will produce a large amount of nitrogen oxides, which has adverse effects on the environment. Therefore, how to recycle waste gas from copper clad laminates in a green and environmentally friendly way has become a technical problem that needs to be solved urgently in this field. Summary of the invention

[0003] The purpose of the present invention is to provide a method for recovering waste gas from copper clad laminates. The recovery method provided by the present invention can recover waste gas from copper clad laminates in a green and environmentally friendly manner.

[0004] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0005] The present invention provides a method for recovering waste gas from a copper clad laminate, comprising the following steps:

[0006] (1) subjecting the copper-clad laminate waste gas to a first reverse contact with a first solvent to obtain a first tail gas;

[0007] (2) subjecting the first tail gas obtained in step (1) to a second reverse contact with a second solvent to obtain a second tail gas;

[0008] (3) subjecting the second tail gas obtained in step (2) to a third reverse contact with water to obtain waste water;

[0009] The first solvent in step (1) and the second solvent in step (2) independently include at least one of ethylene glycol diacetate, N-methylpyrrolidone, propylene glycol methyl ether and dimethyl sulfoxide.

[0010] Preferably, in step (1), the ratio of the volume of the copper clad laminate waste gas to the mass of the first solvent is (20000-40000) m 3 / t.

[0011] Preferably, the time of the first reverse contact in step (1) is 1 to 10 seconds.

[0012] Preferably, the time of the first reverse contact in step (1) is 2 to 8 seconds.

[0013] Preferably, in step (2), the ratio of the volume of the first tail gas to the mass of the second solvent is (20000-40000) m 3 / t.

[0014] Preferably, the time of the second reverse contact in step (2) is 2 to 8 seconds.

[0015] Preferably, the first countercurrent contact in step (1) and the second countercurrent contact in step (2) are independently carried out in absorption towers.

[0016] Preferably, the absorption tower is provided with a filler.

[0017] Preferably, the filler is made of at least one of PP, polytetrafluoroethylene and stainless steel.

[0018] Preferably, the COD in the wastewater in step (3) is 300-800 ppm.

[0019] The present invention provides a method for recovering waste gas from copper clad laminates, comprising the following steps: subjecting the waste gas from the copper clad laminates to a first reverse contact with a first solvent to obtain a first tail gas; subjecting the first tail gas to a second reverse contact with a second solvent to obtain a second tail gas; subjecting the second tail gas to a third reverse contact with water to obtain waste water; the first solvent and the second solvent independently include at least one of ethylene glycol diacetate, N-methylpyrrolidone, propylene glycol methyl ether and dimethyl sulfoxide. The present invention utilizes the principle of similar dissolves, and adopts a two-stage solvent, wherein at least one of ethylene glycol diacetate, N-methylpyrrolidone, propylene glycol methyl ether and dimethyl sulfoxide can absorb organic components in the waste gas from the copper clad laminates, and convert the organic components in the waste gas from a gaseous state to a liquid state, thereby laying a foundation for subsequent separation and purification, and also reducing the consumption of materials and the impact on the environment; and then using water for absorption, all the impurity components in the waste gas from the copper clad laminates can be absorbed into the water, thereby realizing the environmentally friendly recovery of the waste gas from the copper clad laminates. The experimental results show that the COD in the wastewater obtained by the recovery method provided by the present invention is 398-512ppm, and the VOCs in the waste gas is 50mg / m 3 . DETAILED DESCRIPTION

[0020] The present invention provides a method for recovering waste gas from a copper clad laminate, comprising the following steps:

[0021] (1) subjecting the copper-clad laminate waste gas to a first reverse contact with a first solvent to obtain a first tail gas;

[0022] (2) subjecting the first tail gas obtained in step (1) to a second reverse contact with a second solvent to obtain a second tail gas;

[0023] (3) subjecting the second tail gas obtained in step (2) to a third reverse contact with water to obtain waste water;

[0024] The first solvent in step (1) and the second solvent in step (2) independently include at least one of ethylene glycol diacetate, N-methylpyrrolidone, propylene glycol methyl ether and dimethyl sulfoxide.

[0025] The present invention has no particular limitation on the sources of the raw materials, and commercially available products known to those skilled in the art may be used.

[0026] The recovery method provided by the invention is applicable to waste gas from copper-clad laminates, and is preferably applicable to waste gas from copper-clad laminates containing acetone, propylene glycol methyl ether, butanone, cyclohexanone and dimethylformamide.

[0027] The present invention has no special limitation on the content of each component in the copper-clad laminate waste gas, and the copper-clad laminate waste gas well known to those skilled in the art can be used.

[0028] The present invention conducts first reverse contact between copper-clad laminate waste gas and a first solvent to obtain a first tail gas.

[0029] In the present invention, the first solvent includes at least one of ethylene glycol diacetate, N-methylpyrrolidone, propylene glycol methyl ether and dimethyl sulfoxide. The present invention utilizes the principle of like dissolves like, and uses at least one of ethylene glycol diacetate, N-methylpyrrolidone, propylene glycol methyl ether and dimethyl sulfoxide to absorb organic components in the waste gas of copper clad laminates, and converts the organic components in the waste gas of copper clad laminates from gaseous state to liquid state to obtain spray liquid, laying a foundation for subsequent separation and purification, and also reducing the consumption of materials and the impact on the environment.

[0030] In the present invention, the ratio of the volume of the copper clad laminate waste gas to the mass of the first solvent is (20000-40000) m 3 As an embodiment, the ratio of the volume of the copper clad laminate waste gas to the mass of the first solvent may be (27000-38000) m 3 / t, can also be 30000m 3 / t. In the present invention, limiting the ratio of the volume of the copper-clad laminate waste gas to the mass of the first solvent within the above range can further improve the removal rate of organic components in the copper-clad laminate waste gas.

[0031] In the present invention, the first reverse contact is preferably carried out in an absorption tower. The present invention has no particular limitation on the type of the absorption tower, and equipment and instruments well known to those skilled in the art can be used.

[0032] In the present invention, the copper clad laminate waste gas is preferably introduced into the bottom of the absorption tower through a fan. The present invention has no special limitation on the operation of introducing the copper clad laminate waste gas into the bottom of the absorption tower through a fan, and the operation well known to those skilled in the art can be adopted.

[0033] In the present invention, the first solvent is preferably transferred to the top of the absorption tower by a circulation pump and then sprayed by an atomizing nozzle. The present invention has no special limitation on the operation of transferring the first solvent to the top of the absorption tower by a circulation pump and then spraying by an atomizing nozzle, and the operation well known to those skilled in the art can be used.

[0034] In the present invention, the absorption tower is preferably provided with a filler; the material of the filler is preferably at least one of PP, polytetrafluoroethylene and stainless steel. The present invention has no special limitation on the size of the filler, and fillers well known to those skilled in the art can be used. In the present invention, the first solvent sprayed on the top of the absorption tower is sprayed from above to form a solvent liquid film on the filler layer, and the copper-clad laminate waste gas enters the bottom of the tower and runs from bottom to top, and is fully in contact with the solvent liquid film on the filler layer, so as to reversely wash and absorb the copper-clad laminate waste gas.

[0035] In the present invention, the material of the absorption tower and the pipeline is preferably at least one of PP, polytetrafluoroethylene and stainless steel.

[0036] In the present invention, the first reverse contact time is preferably 1 to 10 seconds, more preferably 2 to 8 seconds. As an embodiment, the first reverse contact time can be 3 seconds, 4 seconds, 5 seconds, 6 seconds or 7 seconds. The present invention limits the first reverse contact time to the above range to further improve the removal rate of organic components in the copper clad laminate waste gas.

[0037] In the present invention, a temperature monitor is provided at the bottom of the absorption tower. The present invention has no special limitation on the model of the temperature monitor, and any instrument or equipment well known to those skilled in the art can be used.

[0038] In the present invention, when the temperature of the spray liquid obtained by the first reverse contact is ≥30°C, the condensation cycle is preferably started. The present invention has no special limitation on the setting of the condensation cycle, and the operation familiar to those skilled in the art can be adopted. In the present invention, when the temperature of the spray liquid is ≥30°C, the condensation cycle is started, and the spray liquid solvent in the absorption tower is controlled within 30°C by a shell-and-tube heat exchanger to avoid volatilization of low-boiling point components in the spray liquid.

[0039] After obtaining the first tail gas, the present invention conducts a second reverse contact between the first tail gas and a second solvent to obtain a second tail gas.

[0040] In the present invention, the first tail gas is preferably cooled before the second reverse contact between the first tail gas and the second solvent. The present invention has no special limitation on the cooling operation, and the temperature can be reduced to ≤50°C by an operation well known to those skilled in the art.

[0041] In the present invention, the second solvent includes at least one of ethylene glycol diacetate, N-methylpyrrolidone, propylene glycol methyl ether and dimethyl sulfoxide. The present invention utilizes the principle of like dissolves like, and uses at least one of ethylene glycol diacetate, N-methylpyrrolidone, propylene glycol methyl ether and dimethyl sulfoxide to absorb organic components in the waste gas of copper clad laminates, and converts the organic components in the waste gas of copper clad laminates from gaseous state to liquid state to obtain spray liquid, laying a foundation for subsequent separation and purification, and also reducing the consumption of materials and the impact on the environment.

[0042] In the present invention, the volume ratio of the first tail gas to the mass ratio of the second solvent is preferably (20000-40000) m 3 As an embodiment, the ratio of the volume of the first tail gas to the mass of the second solvent may be (27000-38000) m 3 / t, can also be 30000m 3 / t. In the present invention, limiting the ratio of the volume of the first tail gas to the mass of the second solvent within the above range can further improve the removal rate of organic components in the waste gas of the copper clad laminate.

[0043] In the present invention, the second reverse contact is preferably carried out in an absorption tower. The present invention has no particular limitation on the type of the absorption tower, and equipment and instruments well known to those skilled in the art can be used.

[0044] In the present invention, the configuration and operation of the absorption tower are preferably the same as those of the first reverse contact, and will not be described in detail herein.

[0045] In the present invention, the second reverse contact time is preferably 2 to 8 seconds. As an embodiment, the second reverse contact time can be 3 seconds, 4 seconds, 5 seconds, 6 seconds or 7 seconds. The present invention limits the second reverse contact time to the above range to further improve the removal rate of organic components in the waste gas of the copper clad laminate.

[0046] In the present invention, the spray liquid obtained by the second reverse contact is preferably used as the first solvent and recycled to the first reverse contact. The operation of recycling the spray liquid obtained by the second reverse contact as the first solvent to the first reverse contact is preferably the same as the operation of the first reverse contact, which will not be repeated here.

[0047] After obtaining the second tail gas, the present invention conducts a third reverse contact between the second tail gas and water to obtain waste water. The present invention uses water for absorption, and can absorb all the impurity components in the copper clad laminate waste gas (a very small amount of non-condensable gas in the copper clad laminate waste gas and a small amount of non-condensable gas of decomposition products) into water, thereby realizing environmentally friendly recovery of copper clad laminate waste gas.

[0048] The present invention has no particular limitation on the amount of water used, as long as the COD in the wastewater is 300 to 800 ppm.

[0049] In the present invention, the third reverse contact time is preferably 2 to 8 seconds. As an embodiment, the third reverse contact time can be 3 seconds, 4 seconds, 5 seconds, 6 seconds or 7 seconds. The present invention limits the third reverse contact time to the above range to further absorb all the impurity components in the copper clad laminate waste gas into water.

[0050] In the present invention, the third reverse contact is preferably carried out in a spray tower. The present invention has no special limitation on the type of the spray tower, and any equipment well known to those skilled in the art can be used.

[0051] In the present invention, the second tail gas is preferably directed to the spray tower via an air duct. The present invention has no special limitation on the operation of directing the second tail gas to the spray tower via an air duct, and the operation well known to those skilled in the art can be adopted.

[0052] In the present invention, the VOCs in the waste gas obtained by the third reverse contact is preferably ≤50 mg / m 3 ; The waste gas is preferably discharged.

[0053] In the present invention, the COD in the wastewater is preferably 300-800 ppm; the wastewater is preferably discharged into a sewage treatment system.

[0054] The invention utilizes the principle of like dissolves like and adopts a two-stage solvent. At least one of ethylene glycol diacetate, N-methylpyrrolidone, propylene glycol methyl ether and dimethyl sulfoxide can absorb organic components in the waste gas of the copper clad laminate, and transform the organic components in the waste gas of the copper clad laminate from gaseous state to liquid state, thereby laying a foundation for subsequent separation and purification and reducing the consumption of materials and the impact on the environment. Then water is used for absorption, so that all the impurity components in the waste gas of the copper clad laminate can be absorbed into the water, thereby realizing the environmentally friendly recovery of the waste gas of the copper clad laminate.

[0055] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] Example 1

[0057] The method for recovering waste gas from copper clad laminate is as follows:

[0058] (1) The 58°C copper clad laminate waste gas is introduced into the bottom of the absorption tower through a fan, and N-methylpyrrolidone is transmitted to the top of the absorption tower through a circulation pump, and then sprayed on the packing layer of the absorption tower by an atomizing nozzle for the first reverse contact for 5 seconds to obtain the first tail gas; wherein, the copper clad laminate waste gas contains 40 kg / h of propylene glycol methyl ether, 135 kg / h of butanone and acetone in total, 10 kg / h of cyclohexanone, and 33 kg / h of dimethylformamide; the ratio of the volume of the copper clad laminate waste gas to the mass of N-methylpyrrolidone is 30000 m 3 / t; the material of the packing is polytetrafluoroethylene; the material of the absorption tower and the pipeline is polytetrafluoroethylene; a temperature monitor is provided at the bottom of the absorption tower; when the temperature of the spray liquid obtained by the first reverse contact is ≥30°C, the condensation cycle is started, and the spray liquid solvent in the absorption tower is controlled within 30°C through the shell-and-tube heat exchanger;

[0059] (2) The first tail gas obtained in step (1) is cooled to 40° C., and then introduced into the bottom of the absorption tower through a fan, and the N-methylpyrrolidone is transmitted to the top of the absorption tower through a circulation pump, and then sprayed on the packing layer of the absorption tower by an atomizing nozzle for a second reverse contact of 5 seconds to obtain a second tail gas; wherein the volume ratio of the first tail gas to the mass ratio of the N-methylpyrrolidone is 30000m 3 / t; the material of the packing is polytetrafluoroethylene; the material of the absorption tower and the pipeline is polytetrafluoroethylene; a temperature monitor is provided at the bottom of the absorption tower; when the temperature of the spray liquid obtained by the second reverse contact is ≥30°C, the condensation cycle is started, and the spray liquid solvent in the absorption tower is controlled within 30°C through the shell-and-tube heat exchanger;

[0060] (3) The second tail gas obtained in step (2) is directed to a spray tower through an air duct for a third reverse contact with water for 6 seconds to obtain wastewater with a COD of 420 ppm, which is discharged into a sewage treatment system; the waste gas obtained has a VOCs content of 50 mg / m 3 .

[0061] Example 2

[0062] The method for recovering waste gas from copper clad laminate is as follows:

[0063] (1) The 58°C copper clad laminate waste gas is introduced into the bottom of the absorption tower through a fan, and N-methylpyrrolidone is transmitted to the top of the absorption tower through a circulation pump, and then sprayed on the packing layer of the absorption tower by an atomizing nozzle for the first reverse contact for 5 seconds to obtain the first tail gas; wherein, the propylene glycol methyl ether in the copper clad laminate waste gas is 50Kg / h, butanone and acetone are 145Kg / h in total, cyclohexanone is 12Kg / h, and dimethylformamide is 48Kg / h; the volume ratio of the copper clad laminate waste gas to the mass ratio of N-methylpyrrolidone is 38000m 3 / t; the material of the packing is polytetrafluoroethylene; the material of the absorption tower and the pipeline is polytetrafluoroethylene; a temperature monitor is provided at the bottom of the absorption tower; when the temperature of the spray liquid obtained by the first reverse contact is ≥30°C, the condensation cycle is started, and the spray liquid solvent in the absorption tower is controlled within 30°C through the shell-and-tube heat exchanger;

[0064] (2) The first tail gas obtained in step (1) is cooled to 41° C., and then introduced into the bottom of the absorption tower through a fan, and the N-methylpyrrolidone is transmitted to the top of the absorption tower through a circulation pump, and then sprayed on the packing layer of the absorption tower by an atomizing nozzle for a second reverse contact of 5 seconds to obtain a second tail gas; wherein the volume ratio of the first tail gas to the mass ratio of the N-methylpyrrolidone is 38000m 3 / t; the material of the packing is polytetrafluoroethylene; the material of the absorption tower and the pipeline is polytetrafluoroethylene; a temperature monitor is provided at the bottom of the absorption tower; when the temperature of the spray liquid obtained by the second reverse contact is ≥30°C, the condensation cycle is started, and the spray liquid solvent in the absorption tower is controlled within 30°C through the shell-and-tube heat exchanger;

[0065] (3) The second tail gas obtained in step (2) is directed to the spray tower through the air duct for a third reverse contact with water for 6 seconds to obtain wastewater with a COD of 512 ppm, which is discharged into the sewage treatment system; the waste gas obtained has a VOCs content of 50 mg / m 3 .

[0066] Example 3

[0067] The method for recovering waste gas from copper clad laminate is as follows:

[0068] (1) The 58°C copper clad laminate waste gas is introduced into the bottom of the absorption tower through a fan, and N-methylpyrrolidone is transmitted to the top of the absorption tower through a circulation pump, and then sprayed on the packing layer of the absorption tower by an atomizing nozzle for the first reverse contact for 5 seconds to obtain the first tail gas; wherein, the copper clad laminate waste gas contains 30 kg / h of propylene glycol methyl ether, 99 kg / h of butanone and acetone, 7 kg / h of cyclohexanone, and 30 kg / h of dimethylformamide; the volume ratio of the copper clad laminate waste gas to the mass ratio of N-methylpyrrolidone is 27000 m 3 / t; the material of the packing is polytetrafluoroethylene; the material of the absorption tower and the pipeline is polytetrafluoroethylene; a temperature monitor is provided at the bottom of the absorption tower; when the temperature of the spray liquid obtained by the first reverse contact is ≥30°C, the condensation cycle is started, and the spray liquid solvent in the absorption tower is controlled within 30°C through the shell-and-tube heat exchanger;

[0069] (2) The first tail gas obtained in step (1) is cooled to 40° C., and then introduced into the bottom of the absorption tower through a fan, and the N-methylpyrrolidone is transmitted to the top of the absorption tower through a circulation pump, and then sprayed on the packing layer of the absorption tower by an atomizing nozzle for a second reverse contact of 5 seconds to obtain a second tail gas; wherein the volume ratio of the first tail gas to the mass ratio of the N-methylpyrrolidone is 27000m 3 / t; the material of the packing is polytetrafluoroethylene; the material of the absorption tower and the pipeline is polytetrafluoroethylene; a temperature monitor is provided at the bottom of the absorption tower; when the temperature of the spray liquid obtained by the second reverse contact is ≥30°C, the condensation cycle is started, and the spray liquid solvent in the absorption tower is controlled within 30°C through the shell-and-tube heat exchanger;

[0070] (3) The second tail gas obtained in step (2) is directed to the spray tower through the air duct for a third reverse contact with water for 6 seconds to obtain wastewater with a COD of 398 ppm, which is discharged into the sewage treatment system; the waste gas obtained has a VOCs content of 50 mg / m 3 .

[0071] It can be seen from the above embodiments that the recovery method provided by the present invention can recover waste gas from copper clad laminates in a green and environmentally friendly manner.

[0072] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for recovering waste gas from copper clad laminates, comprising the following steps: (1) subjecting the copper-clad laminate waste gas to a first reverse contact with a first solvent to obtain a first tail gas; (2) subjecting the first tail gas obtained in step (1) to a second reverse contact with a second solvent to obtain a second tail gas; (3) subjecting the second tail gas obtained in step (2) to a third reverse contact with water to obtain waste water; The first solvent in step (1) and the second solvent in step (2) independently include at least one of ethylene glycol diacetate, N-methylpyrrolidone, propylene glycol methyl ether and dimethyl sulfoxide.

2. The recycling method according to claim 1, characterized in that: In the step (1), the ratio of the volume of the copper-clad laminate waste gas to the mass of the first solvent is (20000-40000) m 3 / t.

3. The recycling method according to claim 1, characterized in that: The time of the first reverse contact in step (1) is 1 to 10 seconds.

4. The recovery method according to claim 1 or 3, characterized in that: The time of the first reverse contact in step (1) is 2 to 8 seconds.

5. The recycling method according to claim 1, characterized in that: In the step (2), the ratio of the volume of the first tail gas to the mass of the second solvent is (20000-40000) m 3 / t.

6. The recycling method according to claim 1, characterized in that: The time of the second reverse contact in step (2) is 2 to 8 seconds.

7. The recycling method according to claim 1, characterized in that: The first countercurrent contact in step (1) and the second countercurrent contact in step (2) are independently carried out in absorption towers.

8. The recycling method according to claim 7, characterized in that: The absorption tower is provided with fillers.

9. The recycling method according to claim 8, characterized in that: The material of the filler is at least one of PP, polytetrafluoroethylene and stainless steel.

10. The recycling method according to claim 1, characterized in that: The COD in the wastewater in step (3) is 300-800 ppm.