Dimethylamine waste gas recycling device

Abstract

The utility model discloses a dimethylamine waste gas recycling device which comprises a recycling mechanism, a storage tank and a proportioning tank which are sequentially connected in series. The recovery mechanism is communicated with an external reaction mechanism through a collecting pipe, and dimethylamine waste gas generated by each stage of reaction enters the recovery mechanism along the collecting pipe and is converted into a dimethylamine solution with C1 concentration. The recovered dimethylamine solution is introduced into the storage tank and then mixed with the dimethylamine solution with the concentration C2 in the proportioning tank for re-proportioning to obtain a dimethylamine solution with the concentration C3 capable of being directly used by a front-end process, and the concentration C3 is greater than the concentration C1 and less than the concentration C2. By arranging the recycling mechanism, the storage tank and the proportioning tank which are sequentially connected in series, the dimethylamine waste gas generated by external reaction can be recycled and converted into a C3-concentration dimethylamine solution meeting the production requirement, so that the emission of the dimethylamine waste gas is reduced, and the environmental protection property and the economical efficiency of the process are improved.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of waste gas treatment, in particular to a dimethylamine waste gas recovery and reuse device. Background Art

[0002] Dimethylamine is an organic substance, a colorless gas at room temperature, with a low boiling point and high volatility, and is highly soluble in water. High concentrations of dimethylamine have an ammonia-like smell, and low concentrations of dimethylamine have a rotten fish smell. It is one of the raw materials for the production of medicines, dyes, pesticides, textile industry solvents, leather depilatories, rubber vulcanization accelerators and other products. A large amount of dimethylamine waste gas will be generated during the production of the above products. At present, the treatment method for these waste gases is mainly to pass them into a tail gas absorption tower for combustion treatment, or to condense them first and then discharge the waste liquid directly to an environmental protection treatment station for environmental protection treatment and then discharge them. In other words, the existing treatment technology is to eliminate the dimethylamine waste instead of recycling it, which is a waste of dimethylamine, and the technology still has certain pollution to the environment. At the same time, the amount of wastewater is large, and its economy and environmental protection are not enough. In order to improve economy and environmental protection, the dimethylamine waste gas can be recycled and reused to reduce external emissions and reduce raw material consumption. Therefore, a dimethylamine waste gas recycling and reuse device is needed. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a dimethylamine waste gas recovery and reuse device.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A dimethylamine waste gas recovery and reuse device comprises a recovery mechanism for converting dimethylamine waste gas into a C1 concentration dimethylamine solution, a storage tank for storing the C1 concentration dimethylamine solution, and a proportioning tank for mixing the C1 concentration dimethylamine solution with a C2 concentration dimethylamine solution to form a C3 concentration dimethylamine solution, wherein the recovery mechanism, the storage tank and the proportioning tank are sequentially connected in series.

[0006] As a further improvement of the above technical solution:

[0007] The recovery mechanism comprises a condensing mechanism for condensing dimethylamine waste gas into a dimethylamine solution, and a spray absorption tower connected in series with the condensing mechanism for absorbing the remaining dimethylamine waste gas to form a dimethylamine solution.

[0008] The condensation mechanism includes a plurality of first condensers connected in series, and a second condenser connected in series to the tail end of the first condenser, and the liquid outlet ends of the first condenser and the second condenser are connected to the storage tank; the second condenser is made of transparent glass.

[0009] The tube diameter of the second condenser is smaller than the tube diameter of the first condenser, and the condensation cycle section of the second condenser is configured as a spiral pipeline.

[0010] The liquid inlet end of the spray absorption tower is located on the upper side of the gas inlet end thereof.

[0011] The storage tank is connected to the proportioning tank, and a booster valve for pumping the C1 concentration dimethylamine solution into the proportioning tank and a check valve for preventing liquid backflow are installed between the two.

[0012] The proportioning tank is connected with an input pipe 1 for inputting a dimethylamine solution with a C2 concentration and an input pipe 2 for inputting water.

[0013] The proportioning tank is connected with the circulation pump 1 and the cooler in a closed loop.

[0014] The first condenser and the second condenser are connected to the storage tank via pipelines, and the pipelines are bent to form a U-shaped liquid seal.

[0015] A glass sight glass is provided between the first condenser and the U-shaped liquid seal, and / or between the second condenser and the spray absorption tower.

[0016] Compared with the prior art, the advantages of the utility model are:

[0017] The dimethylamine waste gas generated by each stage of the reaction is collected through a collecting pipe, and condensed into a dimethylamine solution through a condensing mechanism in the recovery mechanism; the uncondensed dimethylamine waste gas is absorbed into a dimethylamine solution through a spray absorption tower. The recovered dimethylamine solution is passed into a storage tank, and then into a proportioning tank to be re-proportioned to obtain a dimethylamine solution that can be directly used by the front-end process. By setting a recovery mechanism, a storage tank and a proportioning tank in series, the dimethylamine waste gas generated by the external reaction can be recovered and converted into a C3 concentration dimethylamine solution that meets the production requirements, thereby reducing the emission of dimethylamine waste gas and improving the environmental protection and economic efficiency of the process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of the dimethylamine recovery and recycling device in the embodiment.

[0019] The numbers in the figure represent: 1. Recovery mechanism; 11. Condensation mechanism; 111. First condenser; 112. Second condenser; 113. Pipeline; 114. U-shaped liquid seal; 115. Collecting pipe; 12. Spray absorption tower; 121. Liquid inlet end; 122. Gas inlet end; 123. Water pipe; 124. Exhaust pipe; 125. Liquid level gauge one; 126. Sampling port; 127. Circulating pump two; 128. Valve; 2. Storage tank; 21. Liquid level gauge two; 3. Proportioning tank; 31. Booster valve; 32. Check valve; 33. Input pipe one; 34. Input pipe two; 35. Cooler; 36. Circulating pump one; 4. Glass sight glass. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Example

[0022] like Figure 1 As shown, the dimethylamine waste gas recovery and reuse device of this embodiment includes a recovery mechanism 1 for collecting and converting the dimethylamine waste gas generated from the previous stages of reaction into a dimethylamine solution with a C1 concentration, a storage tank 2 for storing the C1 concentration dimethylamine solution, and a proportioning tank 3 for mixing the C1 concentration dimethylamine solution with the C2 concentration dimethylamine solution input from the input pipe 133 to form a C3 concentration dimethylamine solution. The recovery mechanism 1, the storage tank 2 and the proportioning tank 3 are connected in series in sequence. The recovery mechanism 1 is connected to the external reaction mechanism through the collection pipe 115, and the dimethylamine waste gas generated by each stage of reaction enters the recovery mechanism 1 along the collection pipe 115 and is converted into a C1 concentration dimethylamine solution. The recovered dimethylamine solution is passed into the storage tank 2, and then mixed with the C2 concentration dimethylamine solution in the proportioning tank 3 to obtain a C3 concentration dimethylamine solution that can be directly used by the front-end process, wherein the C1 concentration is less than the C3 concentration and less than the C2 concentration. By providing a recovery mechanism 1, a storage tank 2 and a proportioning tank 3 connected in series, the dimethylamine waste gas generated by the external reaction can be recovered and converted into a C3 concentration dimethylamine solution that meets the production requirements, thereby reducing the emission of dimethylamine waste gas and improving the environmental protection and economic efficiency of the process. Preferably, the 1% to 2% concentration dimethylamine solution recovered by the above-mentioned recovery mechanism 1 is stored in the storage tank 2, and then mixed with the 100% concentration dimethylamine solution in the proportioning tank 3 to prepare an 80% concentration dimethylamine solution that can be directly used for process production.

[0023] In this embodiment, the recovery mechanism 1 includes a condensing mechanism 11 for condensing dimethylamine waste gas into a dimethylamine solution, and a spray absorption tower 12 connected in series therewith for absorbing the remaining dimethylamine waste gas to form a dimethylamine solution. Dimethylamine gas is easily soluble in water. The dimethylamine waste gas is first passed into the condensing mechanism 11 to be condensed into a dimethylamine solution, and the remaining uncondensed dimethylamine waste gas is then passed into the spray absorption tower 12 to generate a dimethylamine solution by using its water solubility, and then passed into the storage tank 2. Through the multi-stage treatment of the condensing mechanism 11 and the spray absorption tower 12 in the recovery mechanism 1, the dimethylamine waste gas generated by the front-end process can be more thoroughly absorbed, thereby reducing the emission of dimethylamine waste gas.

[0024] In this embodiment, the condensation mechanism 11 includes a plurality of first condensers 111 connected in series, and a second condenser 112 connected in series to the tail end of the first condenser 111. The liquid outlet ends of the first condenser 111 and the second condenser 112 are connected to the storage tank 2; the second condenser 112 is made of transparent glass. The first condenser 111 and the second condenser 112 both include a gas inlet end, a gas outlet end and a liquid outlet end, wherein the dimethylamine waste gas enters the condenser through the gas inlet end, the condensed liquid is connected to the storage tank 2 through the liquid outlet end, the uncondensed gas is connected to the gas inlet end of the next condenser through the gas outlet end, and the gas outlet end of the second condenser 112 is connected to the gas inlet end 122 of the spray absorption tower 12. This ensures the condensation effect and prevents the waste gas from escaping. Preferably, in order to ensure the condensation effect, the number of first condensers 111 is set to three, and three-stage cooling is performed. The remaining dimethylamine waste gas after condensation in the first condenser 111 is passed into the second condenser 112 for further condensation; the second condenser 112 is made of transparent glass, which is convenient for observing the condensation effect of the gas in the second condenser 112.

[0025] In this embodiment, the tube diameter of the second condenser 112 is smaller than that of the first condenser 111. Since the tube diameter of the second condenser 112 is smaller, the speed of the dimethylamine waste gas when passing through the second condenser 112 will be reduced, and the residence time of the dimethylamine waste gas in the first condenser 111 will also be correspondingly extended, thereby achieving a better condensation effect; and the condensation circulation section of the second condenser 112 is configured as a spiral pipe, which adds a certain resistance to the passing gas to ensure the residence time of the gas in the condensation system and enhance the condensation effect.

[0026] In this embodiment, the liquid inlet end 121 of the spray absorption tower 12 is located on the upper side of its gas inlet end 122. The water input from the water pipe 123 is pumped into the liquid inlet end 121 through the circulation pump 127 from top to bottom for spraying; the remaining dimethylamine waste gas entering from the gas inlet end 122 contacts and absorbs the spray water from bottom to top to form a dimethylamine solution, which is circulated to ensure full absorption. When the liquid level reaches the set value through the liquid level meter 125 and the sampling port 126, and the pH value of the dimethylamine solution reaches about 7.5, the circulation pump 127 can be closed, the valve 128 can be opened, and the dimethylamine solution can be passed into the storage tank 2 to form a dimethylamine solution with a concentration of C1. The remaining gas that has not been absorbed is discharged through the exhaust pipe 124, so as to achieve the maximum recovery of the dimethylamine waste gas, reduce its emission, and prevent environmental pollution.

[0027] In this embodiment, the storage tank 2 is connected to the proportioning tank 3, and a booster valve 31 for pumping the C1 concentration dimethylamine solution into the proportioning tank 3 and a check valve 32 for preventing liquid backflow are installed between the two. Since dimethylamine releases heat when dissolved in water, the proportioning tank 3 is stored under positive pressure, so it is necessary to set a booster valve 31 to transport the C1 concentration dimethylamine solution in the storage tank 2 into the proportioning tank 3, and to prevent liquid backflow, a check valve 32 is provided.

[0028] In this embodiment, the proportioning tank 3 is connected to an input pipe 1 33 for inputting a dimethylamine solution with a concentration of C2 and an input pipe 2 34 for inputting water. Preferably, a 100% concentration dimethylamine liquid accounting for 60% of the volume of the proportioning tank 3 is input from the input pipe 1 33 and an aqueous solution accounting for about 20% to 30% of the volume of the proportioning tank 3 is input from the input pipe 2 34, and then the 1% to 2% concentration dimethylamine solution stored in the storage tank 2 is input, and the input amount is obtained according to calculation and determined by the liquid level meter 21.

[0029] In this embodiment, the proportioning tank 3 is connected in a closed loop with the circulation pump 1 36 and the cooler 35. The boiling point of dimethylamine is 7.4°C and it is volatile. Since dimethylamine is mixed with water and releases heat, in order to prevent the dimethylamine solution from volatilizing again, it is necessary to continuously cool the dimethylamine solution. Therefore, by connecting the proportioning tank 3, the circulation pump 1 36 and the cooler 35 in a closed loop, the circulation cooling is realized to reduce the volatilization of dimethylamine.

[0030] In this embodiment, the first condenser 111 and the second condenser 112 are connected to the storage tank 2 via the pipe 113, and the pipe 113 is bent to form a U-shaped liquid seal 114 to prevent the dimethylamine waste gas from escaping from the pipe 113, avoiding incomplete recovery and preventing the dimethylamine waste gas from polluting the environment.

[0031] In this embodiment, a glass sight glass 4 is provided between the first condenser 111 and the U-shaped liquid seal 114, and / or between the second condenser 112 and the spray absorption tower 12. The condensation effect and the condensation rate can be observed through the glass sight glass 4, and the front-end reaction intensity can be indicated according to the condensation effect and the rate. When the condensation effect and the rate are observed to be too strong, it means that the front-end reaction is too intense and the intensity needs to be reduced, and vice versa.

[0032] The overall process of the dimethylamine waste gas recovery and reuse device is as follows:

[0033] The dimethylamine waste gas generated by the front-end reaction is collected through the collecting pipe 115 and passed into the first condenser 111 for the first stage condensation, and the uncondensed waste gas is passed into the second condenser 112 for the second stage condensation. The condensed dimethylamine solution flows into the storage tank 2 through the pipeline 113, and the uncondensed dimethylamine waste gas is passed into the spray absorption tower 12 for cyclic absorption to form a dimethylamine solution and then passed into the storage tank 2. The C1 concentration dimethylamine solution in the storage tank 2 is then passed into the proportioning tank 3, mixed with the C2 concentration dimethylamine liquid and aqueous solution introduced from the outside, and a C3 concentration dimethylamine solution that can be directly used in the process is prepared.

[0034] Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the art can use the above disclosed technical content to make many possible changes and modifications to the technical solution of the present invention without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A dimethylamine waste gas recovery and recycling device, characterized in that: The invention comprises a recovery mechanism (1) for converting dimethylamine waste gas into a dimethylamine solution with a C1 concentration, a storage tank (2) for storing the dimethylamine solution with a C1 concentration, and a proportioning tank (3) for mixing the dimethylamine solution with a C2 concentration to form a dimethylamine solution with a C3 concentration. The recovery mechanism (1), the storage tank (2) and the proportioning tank (3) are sequentially connected in series.

2. The dimethylamine waste gas recovery and reuse device according to claim 1, characterized in that: The recovery mechanism (1) comprises a condensing mechanism (11) for condensing dimethylamine waste gas into a dimethylamine solution, and a spray absorption tower (12) connected in series therewith for absorbing the remaining dimethylamine waste gas to form a dimethylamine solution.

3. The dimethylamine waste gas recovery and reuse device according to claim 2, characterized in that: The condensation mechanism (11) comprises a plurality of first condensers (111) connected in series, and a second condenser (112) connected in series to the tail end of the first condenser (111), wherein the liquid outlet ends of the first condenser (111) and the second condenser (112) are connected to the storage tank (2); and the second condenser (112) is made of transparent glass.

4. The dimethylamine waste gas recovery and reuse device according to claim 3, characterized in that: The tube diameter of the second condenser (112) is smaller than the tube diameter of the first condenser (111), and the condensation cycle section of the second condenser (112) is configured as a spiral pipeline.

5. The dimethylamine waste gas recovery and reuse device according to claim 2, characterized in that: The liquid inlet end (121) of the spray absorption tower (12) is located on the upper side of the gas inlet end (122) thereof.

6. The dimethylamine waste gas recovery and reuse device according to claim 1, characterized in that: The storage tank (2) is connected to the proportioning tank (3), and a booster valve (31) for pumping the dimethylamine solution with a C1 concentration into the proportioning tank (3) and a check valve (32) for preventing liquid backflow are arranged between the two.

7. The dimethylamine waste gas recovery and reuse device according to claim 1, characterized in that: The proportioning tank (3) is connected to an input pipe 1 (33) for inputting a dimethylamine solution with a C2 concentration and an input pipe 2 (34) for inputting water.

8. The dimethylamine waste gas recovery and reuse device according to claim 1, characterized in that: The proportioning tank (3) is connected to a circulation pump (36) and a cooler (35) in a closed loop.

9. The dimethylamine waste gas recovery and reuse device according to claim 4, characterized in that: The first condenser (111) and the second condenser (112) are both connected to the storage tank (2) via a pipeline (113), and the pipeline (113) is bent to form a U-shaped liquid seal (114).

10. The dimethylamine waste gas recovery and reuse device according to claim 9, characterized in that: A glass sight glass (4) is provided between the first condenser (111) and the U-shaped liquid seal (114), and / or between the second condenser (112) and the spray absorption tower (12).

Images