CN211752593U - EO takes off aldehyde refining plant in ethylene oxide production - Google Patents
EO takes off aldehyde refining plant in ethylene oxide production Download PDFInfo
- Publication number
- CN211752593U CN211752593U CN201921955056.7U CN201921955056U CN211752593U CN 211752593 U CN211752593 U CN 211752593U CN 201921955056 U CN201921955056 U CN 201921955056U CN 211752593 U CN211752593 U CN 211752593U
- Authority
- CN
- China
- Prior art keywords
- tower
- steam
- ethylene oxide
- stripping tower
- stripping
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Gas Separation By Absorption (AREA)
- Treating Waste Gases (AREA)
Abstract
The application discloses an EO dealdehyding refining device in ethylene oxide production, which comprises a stripping tower, a tower bottom reboiler, a stripping tower condenser and an acid washing tower, wherein the stripping tower is internally provided with a first filler; a top air outlet pipe, a water inlet pipe, a second filler, an acid washing inlet and an acid washing liquid outlet pipe are sequentially arranged on the acid washing tower from top to bottom, and the second filler is arranged in the acid washing tower; the gas outlet at the top of the stripping tower is connected with the pickling inlet of the pickling tower through a stripping tower condenser by a pipeline. Utilize the utility model discloses a device structure absorbs, strips and takes off when aldehyde treatment to the technology steam of production ethylene oxide, the device simple structure of this application, easy and simple to handle for the liquid water that absorbs ethylene oxide can cyclic utilization, and the process energy consumption is low, does not produce waste water basically.
Description
Technical Field
The utility model relates to an EO takes off aldehyde refining plant in ethylene oxide production.
Background
Ethylene oxide devices adopt an ethylene direct oxidation method to prepare ethylene oxide, ethylene and oxygen are mixed and then pass through a reactor, under the action of a silver catalyst, the ethylene is oxidized into ethylene oxide through high-temperature heating, then the generated ethylene oxide mixed gas enters a washing tower through a cooler (the generated ethylene oxide mixed gas is acidic), the ethylene oxide mixed gas is in reverse contact with absorption water of lean circulating water added at the upper part, the ethylene oxide is fully absorbed, and the absorbed ethylene oxide-rich circulating water is subjected to steam stripping, rectification and refining to obtain an ethylene oxide product. However, the process steam for producing the ethylene oxide contains a small amount of acids such as formaldehyde, which can affect the product quality of the ethylene oxide and the ethylene glycol and corrode subsequent system equipment, and has a great influence on the refining of the process steam for producing the ethylene oxide. How to better refine and extract an ethylene oxide product from process steam for producing the ethylene oxide becomes a technical problem which needs to be solved urgently.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention aims to provide an EO dealdehyding refining device in ethylene oxide production, and the device structure of the utility model can well absorb, strip and dealdehydize process steam in the ethylene oxide production, and finally obtain an ethylene oxide product.
The EO dealdehyding refining device in the production of ethylene oxide is characterized by comprising a stripping tower, a tower bottom reboiler, a stripping tower condenser and an acid washing tower, wherein the stripping tower is internally provided with a first filler; a top air outlet pipe, a water inlet pipe, a second filler, an acid washing inlet and an acid washing liquid outlet pipe are sequentially arranged on the acid washing tower from top to bottom, and the second filler is arranged in the acid washing tower; the gas outlet at the top of the stripping tower is connected with the pickling inlet of the pickling tower through a stripping tower condenser by a pipeline.
The EO dealdehyding refining device in the production of the ethylene oxide is characterized in that the upper part of the stripping tower is provided with a liquid reflux port, the liquid reflux port is arranged above the first filler, and one end of the pickling liquid outlet pipe, which is far away from the pickling tower, is connected with the liquid reflux port on the upper part of the stripping tower; and a branch liquid pipe is also arranged on the pickling liquid outlet pipe.
The EO dealdehyding refining device in the production of the ethylene oxide is characterized by further comprising a heat exchange medium collecting tank, the reboiler at the bottom of the tower adopts a heat exchanger structure, a hot fluid inlet of the heat exchanger structure is filled with a high-temperature heat exchange medium, and a hot fluid outlet of the heat exchanger structure is connected with the heat exchange medium collecting tank through a pipeline.
The EO dealdehyding refining device in the production of the ethylene oxide is characterized by further comprising a steam ejector and a circulating water flash tank, wherein the lower part of the stripping tower is also provided with a steam inlet and a steam outlet from top to bottom, and the steam inlet of the stripping tower is arranged below the first filler; the steam outlet of the steam ejector is connected with the steam inlet pipeline of the stripping tower, the steam inlet of the steam ejector is divided into two paths, one path of steam outlet is connected with the steam outlet of the stripping tower through a pipeline, the other path of steam outlet is connected with the circulating water flash tank through a pipeline, and the steam ejector sprays high-speed steam into the stripping tower to form local low pressure in the stripping tower, so that the steam pressure at the bottom of the stripping tower is reduced.
The EO dealdehyding refining device in the production of the ethylene oxide is characterized by further comprising a primary absorption tower, wherein a liquid outlet pipe at the bottom of the stripping tower is connected with a liquid inlet at the upper part of the primary absorption tower, process gas for producing the ethylene oxide is introduced into a gas inlet at the lower part of the primary absorption tower, an EO-poor aqueous solution from the bottom of the stripping tower is in reverse contact with the process gas for producing the ethylene oxide in the primary absorption tower, the EO-poor aqueous solution absorbs the ethylene oxide in the process gas to form an EO-rich aqueous solution, and a liquid outlet at the bottom of the primary absorption tower is connected with a raw material liquid inlet pipe of the stripping tower so as to introduce the EO-rich aqueous solution formed in the primary absorption tower into the.
By adopting the above technique, the utility model, adopt one-level absorption tower, strip tower and pickling tower to carry out joint synergism, optimize former strip tower inner structure, through first filler, steam ejector's setting, reduce the interior pan-tilt rate of tower, steam ejector can further reduce pressure differential in the tower moreover, and whole process strips efficiently, and whole process does not produce waste water basically. Utilize the utility model discloses a device structure absorbs, strips and takes off when aldehyde treatment to the technology steam of production ethylene oxide, the device simple structure of this application, easy and simple to handle for the liquid water that absorbs ethylene oxide can cyclic utilization.
Drawings
FIG. 1 is a schematic view showing the structure of an EO dealdehyding purification apparatus in the production of ethylene oxide according to the present application;
the method comprises the following steps of 1-stripping tower, 101-raw material liquid inlet pipe, 102-bottom liquid outlet pipe, 103-first filler, 2-steam ejector, 3-circulating water pump, 4-reflux pump, 5-bottom reboiler, 6-heat exchange medium collecting tank, 7-stripping tower condenser, 8-acid cleaning tower, 801-top gas outlet pipe, 802-water inlet pipe, 803-second filler and 804-acid cleaning liquid outlet pipe.
Detailed Description
The present invention is further illustrated by the following examples, which should not be construed as limiting the scope of the invention.
Example (b): compare FIG. 1
The utility model provides a EO takes off aldehyde refining plant in ethylene oxide production, includes one-level absorption tower, inside stripper 1 that is equipped with first filler 103, be used for heating the liquid in the 1 bottom of the tower of stripper 5 at the bottom of the tower that vaporizes, stripper condenser 7 and pickling tower 8, be equipped with raw materials feed liquor pipe 101 and the bottom of the tower drain pipe 102 that are used for letting in rich EO aqueous solution on stripper 1, raw materials feed liquor pipe 101 is located the top of first filler 103. The upper part of the stripping tower 1 is also provided with a liquid reflux port which is arranged above the first filler 103. Referring to fig. 1, a circulating water pump 3 is provided on the bottom liquid outlet pipe 102.
The process steam for producing the ethylene oxide is in reverse contact with the absorption liquid in the first-stage absorption tower, and the ethylene oxide component in the process steam is extracted by the absorption liquid to form an EO-rich solution. The specific process is as follows: the liquid outlet pipe 102 at the bottom of the stripping tower 1 is connected with the liquid inlet at the upper part of the primary absorption tower, the process steam for producing ethylene oxide is introduced into the gas inlet at the lower part of the primary absorption tower, the EO-poor aqueous solution from the bottom of the stripping tower 1 is in reverse contact with the process steam for producing ethylene oxide in the primary absorption tower, the EO-poor aqueous solution absorbs the ethylene oxide in the process steam to form an EO-rich aqueous solution, and the EO-rich aqueous solution flows into the bottom of the primary absorption tower. And a tower bottom liquid outlet of the primary absorption tower is connected with a raw material liquid inlet pipe 101 of the stripping tower 1 so as to introduce the EO-rich aqueous solution formed in the primary absorption tower into the stripping tower 1 for stripping treatment. The first-stage absorption tower can also be provided with a liquid inlet pipe for introducing fresh water, and the fresh water is used as absorption liquid to absorb ethylene oxide components in the process steam.
Referring to fig. 1, a top air outlet pipe 801, a water inlet pipe 802, a second filler 803, an acid washing inlet and an acid washing outlet pipe 804 are sequentially arranged on the acid washing tower 8 from top to bottom, and the second filler 803 is arranged inside the acid washing tower 8; the gas outlet at the top of the stripping tower 1 is connected with the pickling inlet of the pickling tower 8 through a stripping tower condenser 7 by a pipeline. One end of the acid washing liquid outlet pipe 804 far away from the acid washing tower 8 is connected with a liquid reflux port at the upper part of the stripping tower 1; a branch pipe is further arranged on the acid pickling liquid outlet pipe 804, and a reflux pump 4 is arranged on the acid pickling liquid outlet pipe 804 according to the comparison of fig. 1.
Referring to fig. 1, the apparatus of the present application further includes a heat exchange medium collecting tank 6, the tower bottom reboiler 5 adopts a heat exchanger structure, a hot fluid inlet of the heat exchanger structure is filled with a high-temperature heat exchange medium, and a hot fluid outlet of the heat exchanger structure is connected with the heat exchange medium collecting tank 6 through a pipeline.
The device further comprises a steam ejector 2 and a circulating water flash tank, a steam inlet and a steam outlet are further formed in the lower portion of the stripping tower 1 from top to bottom, and the steam inlet of the stripping tower 1 is arranged below the first filler 103; the steam outlet of the steam ejector 2 is connected with the steam inlet pipeline of the stripping tower 1, the steam inlet of the steam ejector 2 is divided into two paths, one path of steam is connected with the steam outlet of the stripping tower 1 through a pipeline, the other path of steam is connected with the circulating water flash tank through a pipeline, and the steam ejector 2 ejects high-speed steam into the stripping tower 1 to form local low pressure in the stripping tower 1, so that the steam pressure at the bottom of the stripping tower 1 is reduced.
The device of this application during operation:
the EO-poor aqueous solution and the process steam for producing the ethylene oxide are in reverse contact in the primary absorption tower to absorb the ethylene oxide component in the process steam to form the EO-rich aqueous solution. The EO-rich aqueous solution enters the stripping tower 1 through the raw material liquid inlet pipe 101 above the first filler 103, and gases such as EO, formaldehyde and the like dissolved in the EO-rich aqueous solution are stripped out (a small amount of CO) under the action of ascending gas stream steam in the stripping tower 12Oxygen, methane, ethylene and the like are also stripped), and the gas is discharged from a gas outlet at the top of the stripping tower 1 and enters a stripping tower condenser 7 for condensation, most of water and other heavy components in the material in the stripping tower condenser 7 are condensed (ethylene oxide gas exists in a gaseous state basically), and a gas-liquid two-phase mixture is formed in the stripping tower condenser 7.
Because the process steam contains a small amount of acid substances such as formaldehyde and the like, the product quality of ethylene oxide and ethylene glycol can be influenced, and subsequent system equipment can be corroded, the acid substances such as formaldehyde and the like in the process steam are absorbed by the acid washing tower 8, so that the aim of removing aldehyde is fulfilled.
The gas-liquid two-phase mixture formed by condensation in the stripper condenser 7 is introduced into the pickling tower 8 below the second filler 803, the gas-liquid two-phase mixture is separated in the pickling tower 8, the liquid is discharged from the bottom of the pickling tower 8 in two ways, one way is discharged to the next working section for collection and treatment, and the other way is discharged back to the stripper 1 for further stripping treatment (extracting the EO gas remained in the liquid). The gaseous substance is in countercurrent contact with the water introduced from the upper part of the pickling tower 8 to wash off some acid impurities, and the water introduced from the upper part of the pickling tower 8 only needs a small flow rate because the content of acid components such as residual formaldehyde and the like in the gaseous substance is small, so that when the rising gaseous substance is washed, much ethylene oxide is not dissolved in the washing water again. And discharging a gas product, namely an ethylene oxide product, from a gas outlet pipe 801 at the top of the pickling tower 8.
The EO-poor aqueous solution stripped with EO falls to the bottom of a stripping tower 1, the EO-poor aqueous solution at the bottom of the stripping tower 1 is heated by a tower bottom reboiler 5 to form steam, part of the steam formed at the bottom of the stripping tower 1 is discharged into a steam ejector 2, meanwhile, steam in a circulating water flash tank is also fed into the steam ejector 2, and the steam ejector 2 sprays the steam into the stripping tower 1 to be used as stripping steam, so that the temperature required by stripping can be reduced by about 3 ℃ to reduce energy consumption. The lean EO aqueous solution falling at the bottom of the stripping tower 1 can be introduced into the primary absorption tower again to be used as absorption liquid after being cooled, so as to realize the cyclic utilization of liquid water.
The statements in this specification merely set forth a list of implementations of the inventive concept and the scope of the present invention should not be construed as limited to the particular forms set forth in the examples.
Claims (5)
1. The EO dealdehyding refining device in the production of ethylene oxide is characterized by comprising a stripping tower (1) internally provided with a first filler (103), a tower bottom reboiler (5) used for heating and vaporizing liquid in the tower bottom of the stripping tower (1), a stripping tower condenser (7) and an acid washing tower (8), wherein the stripping tower (1) is provided with a raw material liquid inlet pipe (101) and a tower bottom liquid outlet pipe (102) used for introducing an EO-rich aqueous solution, and the raw material liquid inlet pipe (101) is arranged above the first filler (103);
the pickling tower (8) is sequentially provided with a top air outlet pipe (801), a water inlet pipe (802), a second filler (803), a pickling inlet and a pickling liquid outlet pipe (804) from top to bottom, and the second filler (803) is arranged inside the pickling tower (8); the gas outlet at the top of the stripping tower (1) is connected with the pickling inlet of the pickling tower (8) through a stripping tower condenser (7) by a pipeline.
2. The EO dealdehyding refining device in the production of ethylene oxide according to claim 1, characterized in that a liquid reflux port is arranged at the upper part of the stripping tower (1), the liquid reflux port is arranged above the first filler (103), and one end of the pickling liquid outlet pipe (804) far away from the pickling tower (8) is connected with the liquid reflux port at the upper part of the stripping tower (1); a branch pipe is also arranged on the acid pickling liquid outlet pipe (804).
3. The EO dealdehyding refining plant in the production of ethylene oxide according to claim 1, characterized by further comprising a heat exchange medium collection tank (6), wherein the tower bottom reboiler (5) adopts a heat exchanger structure, a hot fluid inlet of the heat exchanger structure is filled with a high-temperature heat exchange medium, and a hot fluid outlet of the heat exchanger structure is connected with the heat exchange medium collection tank (6) through a pipeline.
4. The EO dealdehyding refining plant in the production of ethylene oxide according to claim 1, characterized by further comprising a steam ejector (2) and a circulating water flash tank, wherein the lower part of the stripping column (1) is further provided with a steam inlet and a steam outlet from top to bottom, and the steam inlet of the stripping column (1) is arranged below the first packing (103); the steam outlet of the steam ejector (2) is connected with the steam inlet pipeline of the stripping tower (1), the steam inlet of the steam ejector (2) is divided into two paths, one path of steam outlet is connected with the steam outlet of the stripping tower (1) through a pipeline, the other path of steam outlet is connected with the circulating water flash tank through a pipeline, the steam ejector (2) sprays high-speed steam into the stripping tower (1) to form local low pressure in the stripping tower (1), and therefore the steam pressure at the bottom of the stripping tower (1) is reduced.
5. The EO dealdehyding refining device in the production of ethylene oxide according to claim 1, characterized by further comprising a primary absorption tower, wherein the liquid outlet pipe (102) at the bottom of the stripping tower (1) is connected with the liquid inlet at the upper part of the primary absorption tower, the gas inlet at the lower part of the primary absorption tower is filled with the process gas for producing ethylene oxide, the EO-poor aqueous solution from the bottom of the stripping tower (1) is in reverse contact with the process gas for producing ethylene oxide in the primary absorption tower, the EO-poor aqueous solution absorbs the ethylene oxide in the process gas to form an EO-rich aqueous solution, and the liquid outlet at the bottom of the primary absorption tower is connected with the raw material liquid inlet pipe (101) of the stripping tower (1) so as to fill the EO-rich aqueous solution formed in the primary absorption tower into the stripping tower (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921955056.7U CN211752593U (en) | 2019-11-13 | 2019-11-13 | EO takes off aldehyde refining plant in ethylene oxide production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921955056.7U CN211752593U (en) | 2019-11-13 | 2019-11-13 | EO takes off aldehyde refining plant in ethylene oxide production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211752593U true CN211752593U (en) | 2020-10-27 |
Family
ID=72963248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921955056.7U Active CN211752593U (en) | 2019-11-13 | 2019-11-13 | EO takes off aldehyde refining plant in ethylene oxide production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211752593U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112250239A (en) * | 2020-11-03 | 2021-01-22 | 大连海事大学 | Ship diesel engine waste gas washing water treatment device utilizing ship waste heat |
-
2019
- 2019-11-13 CN CN201921955056.7U patent/CN211752593U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112250239A (en) * | 2020-11-03 | 2021-01-22 | 大连海事大学 | Ship diesel engine waste gas washing water treatment device utilizing ship waste heat |
| CN112250239B (en) * | 2020-11-03 | 2024-04-05 | 大连海事大学 | Ship diesel engine waste gas washing water treatment device utilizing ship waste heat |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104826472B (en) | Smoke carbon dioxide capture recovery system | |
| CN105664671B (en) | A kind of zero carbon emission technique gas purifying method and device | |
| CN103920384A (en) | Equipment for absorbing high-concentration nitric oxides by adopting normal-pressure process | |
| CN102502901B (en) | Condensed fluid stripping method matched with CO transforming device | |
| CN105111171B (en) | Using hexahydro-phthalic acid diisobutyl ester as the technique of solvent recovery cis-butenedioic anhydride | |
| CN211752593U (en) | EO takes off aldehyde refining plant in ethylene oxide production | |
| CN105542876A (en) | Method for using low temperature methanol washing apparatus for removal of impurities in shift gas | |
| CN106927533A (en) | A kind of high-efficiency and energy-saving type low-temperature negative-pressure deamination and ammonia recovery system device | |
| CN106365164A (en) | Device for preparing high-purity carbon monoxide by pyrolysis of formic acid | |
| CN104445474B (en) | A kind of conversion lime set waste water containing ammonia produces method and the device of weak ammonia | |
| CN206126864U (en) | It prepares device of pure liquid ammonia to contain ammonia transform lime set waste water | |
| CN108278908B (en) | Flue gas waste heat and moisture recovery device | |
| CN105061133B (en) | The recovery method of acetylene and retracting device during a kind of vinyl acetate production | |
| CN109929638A (en) | A kind of method and apparatus for integrating hydrate and combining acid gas in removing natural gas with hydramine method | |
| CN211159192U (en) | Processing apparatus of acid water is retrieved to claus sulphur | |
| CN212395910U (en) | Low-temperature methanol washing rich liquid CO2 desorption device | |
| CN209583632U (en) | A kind of device handling H2S Recovered sulphur from viscose glue exhaust gas | |
| CN203938621U (en) | A kind of by the refining isobutyric suite of equipment of isobutyric aldehyde | |
| CN203569056U (en) | Device for eliminating naphthalene from coke oven gas with washing oil | |
| CN210752010U (en) | Desulphurization unit of sulphur process gas among hydrogen fluoride preparation process | |
| CN203959827U (en) | Tripping device for process for preparation of CS 2 molten sulfur | |
| CN203612971U (en) | Ammonia distillation device | |
| CN108854456B (en) | System and method for recycling heat energy of desorption tower | |
| CN106395858B (en) | A kind of method and device converting lime set waste water making pure liquefied ammonia containing ammonia | |
| CN219440713U (en) | Rectifying still that waterborne fluorine alcohol perfluoro octyl propylene glycol draws |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |