CN212051186U - Methyl formate refining and recycling device - Google Patents
Methyl formate refining and recycling device Download PDFInfo
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- CN212051186U CN212051186U CN202020510720.3U CN202020510720U CN212051186U CN 212051186 U CN212051186 U CN 212051186U CN 202020510720 U CN202020510720 U CN 202020510720U CN 212051186 U CN212051186 U CN 212051186U
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Abstract
The utility model relates to a recovery unit is refine to methyl formate, thick methyl formate storage tank communicate through pipeline and thick methyl formate pump, pre-heater, methyl formate rectifying column and methyl alcohol recovery tower in proper order, and first condenser, first backward flow jar, second condenser and second backward flow jar still communicate through pipeline and refrigerated water cooler, the refrigerated water cooler discharge gate passes through pipeline and vapour and liquid separator intercommunication, vapour and liquid separator bottom leakage fluid dram and absorber liquid pan feeding mouth intercommunication, absorber leakage fluid dram pass through pipeline and thick methyl formate storage tank intercommunication, the vapour and liquid separator gas vent passes through pipeline and torch combustion system intercommunication, the inside hollow cylinder that is equipped with of vapour and liquid separator's casing, the inboard feeding of hollow cylinder is through the side spiral entering to better realization gas-liquid separation. The utility model discloses directly carry out recycle with the useful material in the noncondensable gas, also prevent methyl formate decomposition simultaneously.
Description
Technical Field
The utility model relates to a recovery and refined technology field of methyl formate, concretely relates to refined recovery unit of methyl formate.
Background
Methyl formate is an important intermediate in carbon-one chemistry, not only has wide application, but also has a wide market for producing chemical products such as formamide, formic acid and the like as a raw material. The byproduct methyl formate in the process of preparing the ethylene glycol from the coal is refined into a product, so that the energy-saving and environment-friendly level can be improved, the process economic benefit can be improved, considerable economic benefit can be generated, the whole process of preparing the ethylene glycol from the coal is perfected, and the energy-saving and environment-friendly level of the process of preparing the ethylene glycol from the coal is improved.
CN110551025A adopts raw material gas carbon monoxide in the coal-to-ethylene glycol as stripping gas, methyl nitrite in the crude methyl formate is stripped and recovered to the ethylene glycol synthesis system through a methyl nitrite stripping tower. However, in the process, the non-condensable gas at the tops of the methyl formate rectifying tower and the methanol recovery tower enters the liquid seal tank to be absorbed and then is directly discharged as waste liquid, and the method still has the following problems in the operation process, namely 1) the methyl formate and the methanol carried in the non-condensable gas directly enter the liquid seal tank to be discharged as waste liquid, so that resource waste is caused, 2) the solvent in the liquid seal tank is not well screened, if the solvent is selected as water, waste water is directly produced and cannot be recycled, if the solvent is selected as alcohols, further post-treatment is required, the process is complex, 3) the non-condensable gas directly enters the liquid seal tank, the gas flow is strong, the gas flow is easy to impact the wall of the liquid tank, the vibration of equipment is caused, and the potential safety hazard is caused, and 4) the methyl formate in the non-condensable gas is easy to decompose in the pipeline transportation process, so that the process.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a methyl formate refining and recycling device, which directly recycles useful substances in non-condensable gas and simultaneously prevents methyl formate from decomposing.
The utility model adopts the technical proposal that:
a methyl formate refining and recycling device comprises a crude methyl formate storage tank, wherein the crude methyl formate storage tank is sequentially communicated with a crude methyl formate pump, a preheater, a methyl formate rectifying tower and a methanol recovery tower through pipelines, the top of the methyl formate rectifying tower is sequentially communicated with a first condenser and a first reflux tank through pipelines, the top of the methanol recovery tower is sequentially communicated with a second condenser and a second reflux tank through pipelines, the first condenser, the first reflux tank, the second condenser and the second reflux tank are also communicated with a chilled water cooler through pipelines, a discharge port of the chilled water cooler is communicated with a gas-liquid separator through a pipeline, a liquid discharge port at the bottom of the gas-liquid separator is communicated with an absorber liquid feeding port, an absorber liquid discharge port is communicated with the crude methyl formate storage tank through a pipeline, and a gas-liquid separator exhaust port is communicated with a torch combustion system through a pipeline, the shell of the gas-liquid separator is internally provided with a hollow cylinder, the side part of the hollow cylinder is provided with a feed inlet which penetrates through the shell and is communicated with a discharge port of the chilled water cooler through a pipeline, and the absorber shell is provided with an interlayer for introducing a cooling medium.
Preferably, the absorber is provided with 2 absorbers in parallel.
Preferably, the inside absorption external member that is equipped with of absorber, the absorption external member includes the fossil fragments net and locates the inside adsorbent of fossil fragments net, and fossil fragments net is inside hollow cylindrical.
Preferably, the absorber is located the inside bottom of fossil fragments net cavity and is equipped with the flowing back pipeline, and the absorber is located the outside bottom of fossil fragments net cavity and is equipped with the inlet liquid pipeline, adsorbs the external member top and is equipped with the gas vent and communicates with torch combustion system.
Still further preferably, the bottom of the adsorption kit is provided with a nitrogen pipeline, and the upper part of the adsorption kit is provided with a steam pipeline.
Preferably, the bottom discharge port of the first reflux tank is communicated with a methyl formate rectifying tower through a pipeline, the bottom discharge port of the second reflux tank is communicated with a methanol recovery tower through a pipeline, and the bottom discharge port of the methanol recovery tower is communicated with a feeding preheater through a pipeline.
Preferably, the hollow cylinder is coaxial with the housing, the hollow cylinder being connected to the housing by a number of connecting rods.
The utility model discloses beneficial effect:
1. the non-condensable gas at the tops of the methyl formate rectifying tower and the alcohol recovery tower enters a chilled water cooler, methyl formate and methanol carried in the non-condensable gas are cooled into liquid, the liquid enters a gas-liquid separator for gas-liquid separation, a small amount of methyl formate and methanol are separated out and enter an absorber for adsorption, then enter a crude methyl formate storage tank for recycling, and the non-condensable gas separated by the gas-liquid separator enters a torch combustion system through a pipeline for combustion treatment.
2. The shell of the gas-liquid separator is internally provided with a hollow cylinder, the side part of the hollow cylinder is provided with a feed inlet which penetrates through the shell and is communicated with a discharge outlet of the chilled water cooler through a pipeline, non-condensable gas is fed from the inner side of the hollow cylinder and enters through a side spiral so as to better realize gas-liquid separation, the feed inlet can collide with the hollow cylinder to play a role of buffering, the non-condensable gas carrying methyl formate and methanol liquid enters the hollow cylinder, the impact of the non-condensable gas on the gas-liquid separator can be reduced due to the change of the flow direction and the area, the vibration of the gas-liquid separator is reduced, the gas-liquid separator is divided into two upward and downward reverse air flows after entering the hollow cylinder, the vibration can be further reduced, the methyl formate and the methanol liquid are adhered to the surface of the hollow cylinder and flow down along the hollow cylinder to be discharged, the shell is provided with an interlayer for introducing a cooling medium, so that the methyl formate is prevented from being decomposed in the adsorption process, and the stability of the product is ensured.
3. The number of the absorbers is 2, and the absorbers can be intermittently used for adsorption and regeneration according to actual conditions. The keel net is a cylinder with a hollow inner part, and can further adsorb and separate methyl formate and methanol solution. The bottom of the adsorption sleeve piece is provided with a nitrogen pipeline, and the upper part of the adsorption sleeve piece is provided with a steam pipeline for carrying out regeneration treatment on the adsorbent.
Drawings
FIG. 1: the utility model has a schematic structure;
FIG. 2: the structure schematic diagram of the gas-liquid separator;
FIG. 3: the absorber is in a schematic structure;
FIG. 4: a schematic structure diagram of the adsorption kit;
in the figure: the device comprises a crude methyl formate storage tank 1, a crude methyl formate pump 2, a feeding preheater 3, a methyl formate rectifying tower 4, a methanol recovery tower 5, a first condenser 6, a first reflux tank 7, a second condenser 8, a second reflux tank 9, a chilled water cooler 10, a gas-liquid separator 11, a shell 1101, a feeding hole 1102, a hollow cylinder 1103, a connecting rod 1104, an absorber 12, a liquid inlet pipeline 1201, an exhaust port 1202, an adsorption kit 1203, a keel net 12031, an adsorbent 12032, an interlayer 1204, a liquid discharge pipeline 1205, a steam pipeline 1206 and a nitrogen pipeline 1207.
Detailed Description
As shown in figure 1, a methyl formate refining and recycling device comprises a crude methyl formate storage tank 1, wherein the crude methyl formate storage tank 1 is sequentially communicated with a crude methyl formate pump 2, a preheater 3, a methyl formate rectifying tower 4 and a methanol recovery tower 5 through pipelines, the top of the methyl formate rectifying tower 4 is sequentially communicated with a first condenser 6 and a first reflux tank 7 through pipelines, the top of the methanol recovery tower 5 is sequentially communicated with a second condenser 8 and a second reflux tank 9 through pipelines, the first condenser 6, the first reflux tank 7, the second condenser 8 and the second reflux tank 9 are further communicated with a chilled water cooler 10 through pipelines, a discharge hole of the chilled water cooler 10 is communicated with a gas-liquid separator 11 through a pipeline, a liquid discharge hole at the bottom of the gas-liquid separator 11 is communicated with a liquid feeding hole of an absorber 12, a liquid discharge hole of the gas-liquid separator 12 is communicated with the crude methyl formate absorber storage tank 1 through a pipeline, the gas-liquid separator 11 is characterized in that an exhaust port is communicated with a torch combustion system through a pipeline, a hollow column 1103 is arranged inside a shell 1101 of the gas-liquid separator 11, a feeding port 1102 arranged on the side of the hollow column 1103 penetrates through the shell 1101 and is communicated with a discharging port of the chilled water cooler 10 through a pipeline, and an interlayer 1204 arranged on the shell of the absorber 12 is used for introducing a cooling medium.
Preferably, the absorber 12 is provided with 2 in parallel.
Preferably, an absorption set 1203 is arranged inside the absorber 12, the absorption set 1203 comprises a keel net 12031 and an absorbent 12032 arranged inside the keel net 12031, and the keel net 12031 is a cylinder with a hollow inside.
Preferably, a liquid drainage pipeline 1205 is arranged at the bottom of the absorber 12 positioned in the hollow interior of the keel net 12031, a liquid inlet pipeline 1201 is arranged at the bottom of the absorber 12 positioned in the hollow exterior of the keel net 12031, and an exhaust port 1202 arranged above the adsorption kit 1203 is communicated with a torch combustion system.
Still more preferably, a nitrogen pipe 1207 is disposed at the bottom of the adsorption kit 1203, and a steam pipe 1206 is disposed above the adsorption kit 1203.
Preferably, the bottom discharge hole of the first reflux tank 7 is communicated with a methyl formate rectifying tower 4 through a pipeline, the bottom discharge hole of the second reflux tank 9 is communicated with a methanol recovery tower 5 through a pipeline, and the bottom discharge hole of the methanol recovery tower 5 is communicated with a feed preheater 3 through a pipeline.
Preferably, the hollow cylinder 1103 is coaxial with the housing 1101, and the hollow cylinder 1103 is connected to the housing 1101 by a plurality of connecting rods 1104.
The working principle is as follows:
the mass fraction of the crude methyl formate in the crude methyl formate storage tank 1 is 60-80%, the crude methyl formate in the crude methyl formate storage tank 1 is pressurized by a crude methyl formate pump 2, preheated to 50-60 ℃ by a feed preheater 3 and then enters a methyl formate rectifying tower 4 for rectification; the gas phase at the top of the methyl formate rectifying tower 4 enters a first reflux tank 7 after being condensed by a first condenser 6; the bottom liquid of the methyl formate rectifying tower 4 is used as the feed of the methanol recovery tower 5 to recover the methanol therein, and the gas phase at the top of the methanol recovery tower 5 enters a second reflux tank 9 after being condensed by a second condenser 8. The methanol extracted from the tower bottom of the methanol recovery tower 5 is returned to a methanol storage tank in the ethylene glycol synthesis system after heat exchange by the feed preheater 3. The non-condensable gas in the first condenser 6, the first reflux tank 7, the second condenser 8 and the second reflux tank 9 enters the chilled water cooler 10, the temperature of a cooling medium arranged in the chilled water cooler 10 is 3-10 ℃, methyl formate and methanol carried in the non-condensable gas are cooled into liquid, the liquid enters the gas-liquid separator 11 for gas-liquid separation, a small amount of methyl formate and methanol are separated out and enter the adsorber for adsorption and then enter the crude methyl formate storage tank 1 for recycling, and the non-condensable gas separated by the gas-liquid separator 11 enters the torch combustion system through a pipeline for combustion treatment. After the single absorber 12 is used for adsorption, the adsorbent can be regenerated intermittently, a nitrogen pipeline 1207 is arranged at the bottom of the adsorption kit 1203, and a steam pipeline 1206 is arranged above the adsorption kit 1203. Saturated steam is introduced into the jacket of the adsorber to be regenerated, the adsorber is heated to 110 ℃, and then nitrogen is introduced from the lower part of the regenerated adsorber for purging, so that the adsorbent is regenerated.
Claims (7)
1. A methyl formate refining and recycling device comprises a crude methyl formate storage tank (1) and is characterized in that: the system comprises a crude methyl formate storage tank (1), a crude methyl formate pump (2), a preheater (3), a methyl formate rectifying tower (4) and a methanol recovery tower (5) which are sequentially communicated through pipelines, wherein the top of the methyl formate rectifying tower (4) is sequentially communicated with a first condenser (6) and a first reflux tank (7) through pipelines, the top of the methanol recovery tower (5) is sequentially communicated with a second condenser (8) and a second reflux tank (9) through pipelines, the first condenser (6), the first reflux tank (7), the second condenser (8) and the second reflux tank (9) are further communicated with a chilled water cooler (10) through pipelines, a discharge hole of the chilled water cooler (10) is communicated with a gas-liquid separator (11) through a pipeline, a liquid discharge hole at the bottom of the gas-liquid separator (11) is communicated with a liquid feeding hole of an absorber (12), and a liquid discharge hole of the absorber (12) is communicated with the crude methyl formate storage tank (1) through a pipeline, the gas-liquid separator (11) exhaust port is communicated with a torch combustion system through a pipeline, a hollow column body (1103) is arranged inside a shell (1101) of the gas-liquid separator (11), a feeding port (1102) is arranged on the side portion of the hollow column body (1103) and penetrates through the shell (1101) and is communicated with a discharging port of a chilled water cooler (10) through a pipeline, and an interlayer (1204) is arranged on the shell of an absorber (12) and is used for introducing a cooling medium.
2. The methyl formate refining and recovering device according to claim 1, wherein: the number of the absorbers (12) is 2.
3. The methyl formate refining and recovering device according to claim 1, wherein: the absorption device (12) is internally provided with an absorption kit (1203), the absorption kit (1203) comprises a keel net (12031) and an absorbent (12032) arranged in the keel net (12031), and the keel net (12031) is in a hollow cylindrical shape.
4. The methyl formate refining and recovering device according to claim 3, wherein: the absorption device (12) is located the inside bottom of fossil fragments net (12031) cavity and is equipped with flowing back pipeline (1205), and absorption device (12) is located fossil fragments net (12031) cavity outside bottom and is equipped with inlet liquid pipeline (1201), adsorbs external member (1203) top and is equipped with gas vent (1202) and torch combustion system intercommunication.
5. The methyl formate refining and recovering device according to claim 4, wherein: the bottom of the adsorption suite (1203) is provided with a nitrogen pipeline (1207), and a steam pipeline (1206) is arranged above the adsorption suite (1203).
6. The methyl formate refining and recovering device according to claim 1, wherein: the bottom discharge port of the first reflux tank (7) is communicated with a methyl formate rectifying tower (4) through a pipeline, the bottom discharge port of the second reflux tank (9) is communicated with a methanol recovery tower (5) through a pipeline, and the bottom discharge port of the methanol recovery tower (5) is communicated with a feeding preheater (3) through a pipeline.
7. The methyl formate refining and recovering device according to claim 1, wherein: the hollow cylinder (1103) is coaxial with the housing (1101), and the hollow cylinder (1103) is connected to the housing (1101) by a number of connecting rods (1104).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020510720.3U CN212051186U (en) | 2020-04-09 | 2020-04-09 | Methyl formate refining and recycling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020510720.3U CN212051186U (en) | 2020-04-09 | 2020-04-09 | Methyl formate refining and recycling device |
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| Publication Number | Publication Date |
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| CN212051186U true CN212051186U (en) | 2020-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020510720.3U Active CN212051186U (en) | 2020-04-09 | 2020-04-09 | Methyl formate refining and recycling device |
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| Country | Link |
|---|---|
| CN (1) | CN212051186U (en) |
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- 2020-04-09 CN CN202020510720.3U patent/CN212051186U/en active Active
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