CN116920440A - System and method for efficiently refining ethylene oxide - Google Patents
System and method for efficiently refining ethylene oxide Download PDFInfo
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- CN116920440A CN116920440A CN202210320163.2A CN202210320163A CN116920440A CN 116920440 A CN116920440 A CN 116920440A CN 202210320163 A CN202210320163 A CN 202210320163A CN 116920440 A CN116920440 A CN 116920440A
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- refining
- tower
- ethylene oxide
- dehydration
- reboiler
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- 238000007670 refining Methods 0.000 title claims abstract description 129
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 title claims abstract description 102
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 67
- 230000018044 dehydration Effects 0.000 claims abstract description 64
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 claims abstract description 46
- 238000010992 reflux Methods 0.000 claims abstract description 27
- 238000007599 discharging Methods 0.000 claims abstract description 6
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 36
- 239000012071 phase Substances 0.000 claims description 23
- 238000011084 recovery Methods 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 11
- 239000007791 liquid phase Substances 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 6
- 238000009833 condensation Methods 0.000 claims description 4
- 230000005494 condensation Effects 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 239000012808 vapor phase Substances 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims 5
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 abstract description 5
- 239000012535 impurity Substances 0.000 abstract description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 69
- 239000007789 gas Substances 0.000 description 16
- 230000008901 benefit Effects 0.000 description 5
- 238000000605 extraction Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000013064 chemical raw material Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000006735 epoxidation reaction Methods 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- IKHGUXGNUITLKF-XPULMUKRSA-N acetaldehyde Chemical compound [14CH]([14CH3])=O IKHGUXGNUITLKF-XPULMUKRSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- LFMVFTMUPCOARK-UHFFFAOYSA-N ethane-1,2-diol;oxirane Chemical compound C1CO1.OCCO LFMVFTMUPCOARK-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/143—Fractional distillation or use of a fractionation or rectification column by two or more of a fractionation, separation or rectification step
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/32—Other features of fractionating columns ; Constructional details of fractionating columns not provided for in groups B01D3/16 - B01D3/30
- B01D3/322—Reboiler specifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D301/00—Preparation of oxiranes
- C07D301/32—Separation; Purification
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D303/00—Compounds containing three-membered rings having one oxygen atom as the only ring hetero atom
- C07D303/02—Compounds containing oxirane rings
- C07D303/04—Compounds containing oxirane rings containing only hydrogen and carbon atoms in addition to the ring oxygen atoms
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Epoxy Compounds (AREA)
Abstract
The application particularly relates to a system and a method for efficiently refining ethylene oxide, which belong to the technical field of petrochemical industry, wherein the system comprises: the dehydration tower comprises a dehydration tower body and a dehydration tower reboiler, and the dehydration tower reboiler is communicated with the dehydration tower body; the feeding pipeline is communicated with the dehydration tower body; the refining tower comprises a refining tower body, a condensing reflux unit and a refining tower reboiler, wherein the refining tower body is communicated with the dehydrating tower body; the condensing reflux unit is communicated with the refining tower body, and the refining tower reboiler is communicated with the refining tower body; the product discharging pipeline is communicated with the refining tower body; the acetaldehyde removal side line tower comprises a side line tower body and a side line tower reboiler, and the side line tower body is communicated with the refining tower body; by adding the acetaldehyde removal side line tower, acetaldehyde impurities are highly concentrated, the discharge amount of the ethylene oxide containing aldehyde is reduced to about 1.5% of the ethylene oxide feeding amount of a refining system, and the product yield is improved by about 8.5%.
Description
Technical Field
The application belongs to the technical field of petrochemical industry, and particularly relates to a system and a method for efficiently refining ethylene oxide.
Background
Ethylene oxide is an important chemical raw material, and is mainly prepared by an ethylene-oxygen direct epoxidation method, and because ethylene glycol is a main downstream product of ethylene oxide, the refined ethylene oxide products are relatively few, and a plurality of domestic ethylene oxide and ethylene glycol devices are mainly used for producing ethylene glycol products and co-producing a small amount of ethylene oxide products.
Disclosure of Invention
The application aims to provide a system and a method for efficiently refining ethylene oxide, which are used for solving the problems of high efficiency and high yield or conversion of ethylene oxide in the prior ethylene oxide ethylene glycol device and ethylene glycol device.
The embodiment of the application provides a system for efficiently refining ethylene oxide, which comprises the following components:
the dehydration tower comprises a dehydration tower body and a dehydration tower reboiler, wherein the dehydration tower reboiler is communicated with the dehydration tower body and used for reboiling tower kettle liquid;
a feed line communicating with the dehydration column body for providing a reaction feedstock thereto;
the refining tower comprises a refining tower body, a condensation reflux unit and a refining tower reboiler, wherein the refining tower body is communicated with the dehydration tower body and is used for receiving gas-phase feed and providing tower top reflux for the dehydration tower body; the condensing reflux unit is communicated with the refining tower body to provide tower top reflux for the refining tower body, and the refining tower reboiler is communicated with the refining tower body to reboil tower bottom liquid;
the product discharging pipeline is communicated with the refining tower body and used for outputting products;
the dealdehyding side column comprises a side column body and a side column reboiler, wherein the side column body is communicated with the refining column body and is used for receiving an acetaldehyde-rich liquid phase and a returned gas phase.
Optionally, the dehydration tower body with the setting of refining tower reboiler superpose, the refining tower body is located dehydration tower body top, the refining tower body with adopt chimney tray to cut apart between the dehydration tower body.
Optionally, the feed line is provided with a feed preheater for heating the reaction raw materials.
Optionally, the feed preheater is a half-welded or full-welded plate heat exchanger.
Optionally, the system further comprises a heat recovery pipeline for recovering heat of condensate in the tower kettle of the dehydration tower body, wherein an inlet end of the heat recovery pipeline is communicated with the dehydration tower body, and an outlet end of the heat recovery pipeline is respectively communicated with the refining tower reboiler and the side tower reboiler.
Optionally, the refining tower body includes upper segment, hypomere and middle section, be equipped with the tower tray in upper segment and the hypomere, be equipped with the filler in the middle section.
Optionally, the condensation reflux unit is provided with a formaldehyde discharge line for discharging formaldehyde in the gas phase.
Based on the same inventive concept, the embodiment of the application also provides a method for efficiently refining ethylene oxide, which adopts the system for efficiently refining ethylene oxide, and comprises the following steps:
dehydrating an ethylene oxide raw material to obtain a dehydrated gas phase;
refining the dehydrated gas phase to obtain an acetaldehyde-rich liquid phase, refluxing and refining ethylene oxide;
removing acetaldehyde from the acetaldehyde-rich liquid phase to obtain gas-phase ethylene oxide;
recycling the vapor phase ethylene oxide to the refining;
recycling the reflux to the refining.
Alternatively, the refining may be operated at a pressure in the range of 0.17MPaG to 0.25MPaG.
Alternatively, the de-ethanizing operating pressure range is 0.17MPaG to 0.25MPaG.
One or more technical solutions in the embodiments of the present application at least have the following technical effects or advantages:
according to the system for efficiently refining ethylene oxide, provided by the embodiment of the application, the acetaldehyde impurities are highly concentrated by adding the acetaldehyde removal side line tower, so that the discharge amount of ethylene oxide containing aldehyde can be reduced to about 1.5% of the ethylene oxide feeding amount of a refining system, and the product yield is improved by about 8.5%.
The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a system provided by an embodiment of the present application;
FIG. 2 is a flow chart of a method provided by an embodiment of the present application;
reference numerals: 1-dehydration tower, 11-dehydration tower body, 12-dehydration tower reboiler, 2-feeding pipeline, 21-feeding preheater, 3-refining tower, 31-refining tower body, 32-condensing reflux unit, 33-refining tower reboiler, 4-product discharge pipeline, 5-acetaldehyde removal side tower, 51-side tower body, 52-side tower reboiler, 6-chimney tray, 7-heat recovery pipeline.
Detailed Description
The advantages and various effects of the present application will be more clearly apparent from the following detailed description and examples. It will be understood by those skilled in the art that these specific embodiments and examples are intended to illustrate the application, not to limit the application.
Throughout the specification, unless specifically indicated otherwise, the terms used herein should be understood as meaning as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. In case of conflict, the present specification will control.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present application are commercially available or may be prepared by existing methods.
The technical scheme of the embodiment of the application aims to solve the technical problems, and the overall thought is as follows:
ethylene oxide is an important chemical raw material, and is mainly prepared by an ethylene-oxygen direct epoxidation method, and because ethylene glycol is a main downstream product of ethylene oxide, the refined ethylene oxide products are relatively few, and a plurality of domestic ethylene oxide and ethylene glycol devices are mainly used for producing ethylene glycol products and co-producing a small amount of ethylene oxide products. Because of diversification of domestic ethylene glycol production routes and blowout type increase of productivity, domestic ethylene glycol market and price fluctuate greatly, production efficiency of ethylene glycol devices and ethylene oxide/ethylene glycol devices of the existing ethylene routes is seriously affected, and especially production of ultra-large-scale ethylene glycol devices and large amounts of coal ethylene glycol devices of downstream polyester enterprises is greatly affected, the current medium-small-scale ethylene glycol devices and ethylene oxide/ethylene glycol devices are in increasingly severe situations in a long time in the future, and the situation of long-term loss of ethylene glycol products is difficult to change. The ethylene oxide product maintains good profitability due to high transportation safety requirements, and the like, and the economic benefit of the device can be maximally improved by maximally producing the ethylene oxide, and the refined product rate of the traditional ethylene oxide is lower.
According to an exemplary embodiment of the present application, there is provided a system for efficiently refining ethylene oxide, the system comprising: a dehydration tower, a feed line, a refining tower, a product discharge line and a dealdehyding side line tower.
The dehydration tower comprises a dehydration tower body and a dehydration tower reboiler, wherein the dehydration tower reboiler is communicated with the dehydration tower body and used for reboiling tower kettle liquid;
a feed line communicating with the dehydration column body for providing a reaction feedstock thereto;
generally, the feed line is provided with a feed preheater for heating the reaction raw materials. Specifically, the feed preheater is a half-welded or full-welded plate heat exchanger. The heat source of the feeding preheater can be tower kettle condensate of the dehydration tower body or other external heat sources.
The half-welded or full-welded plate heat exchanger can improve heat exchange efficiency, reduce feed residence time, ensure that equipment is as close to a feed inlet of the refining tower as possible, and reduce hydrolysis of ethylene oxide in ethylene oxide aqueous solution feed at a higher temperature.
Generally, the dehydration column feed preheater outlet line is as short as possible and the flow rate is as fast as possible.
The refining tower comprises a refining tower body, a condensation reflux unit and a refining tower reboiler, wherein the refining tower body is communicated with the dehydration tower body and is used for receiving gas-phase feed and providing tower top reflux for the dehydration tower body; the condensing reflux unit is communicated with the refining tower body to provide tower top reflux for the refining tower body, and the refining tower reboiler is communicated with the refining tower body to reboil tower kettle liquid.
In some embodiments, the refining column body includes an upper section, a lower section, and a middle section, trays are disposed in the upper and lower sections, and packing is disposed in the middle section. Specifically, the upper part and the lower part of the refining tower are of tray structures, and the middle part of the refining tower is of structured packing.
In this example, the pressure at the top of the refining column is in the range of 0.17-0.25MPaG, which is lower than the pressure at the top of the conventional ethylene oxide refining column, and can reduce the steam consumption of the reboiler of the refining column.
In some embodiments, the tail end of the condenser at the top of the refining tower is provided with noncondensable gas and gas-phase formaldehyde emission to remove upstream formaldehyde, and the ethylene oxide after formaldehyde removal returns to the refined ethylene oxide system, so that compared with the traditional liquid-phase formaldehyde emission to remove downstream ethylene glycol reaction system, the efficient emission of formaldehyde of the system refining system can be realized, and the product rate of ethylene oxide of the ethylene oxide refining system can be greatly improved by more than 10%.
In some embodiments, the dehydration column body and the refining column reboiler are arranged in an overlapping manner, the refining column body is arranged above the dehydration column body, and a chimney tray is adopted between the refining column body and the dehydration column body for division. Specifically, the dehydration tower and the refining tower form a composite ethylene oxide refining tower with an upper-lower structure, the dehydration tower and the refining tower are connected through a specific chimney tray, the dehydration tower provides ethylene oxide gas-phase feeding for the refining tower through the chimney tray, and the refining tower provides tower top reflux for the dehydration tower through the chimney tray.
The product discharging pipeline is communicated with the refining tower body and used for outputting products; generally, the ethylene oxide product is sidedraw from the last tray of the upper trays of the finishing column.
The dealdehyding side column comprises a side column body and a side column reboiler, wherein the side column body is communicated with the refining column body and is used for receiving an acetaldehyde-rich liquid phase and a returned gas phase. In this embodiment, the side column feed is withdrawn from the first tray of the lower tray of the refining column and the overhead vapor phase is returned to the vapor space above the withdrawal tray of the refining column.
The acetaldehyde removal side line tower of the refining tower further concentrates the concentration of impurity acetaldehyde which is discharged into the ethylene oxide, and in the embodiment, the pressure range of the acetaldehyde removal side line tower is 0.17-0.25MPaG, and the random stainless steel filler is adopted, so that the ethylene oxide product rate of an ethylene oxide refining system can be greatly improved by more than 8.5%.
In some embodiments, the system further comprises a heat recovery line for recovering heat from the condensate in the bottom of the dehydration column body, wherein an inlet end of the heat recovery line is connected to the dehydration column body, and an outlet end of the heat recovery line is connected to the rectifying column reboiler and the side column reboiler, respectively. At the same time, the outlet end of the heat recovery line may also be in communication with a feed preheater of the feed line.
The condensate in the dehydration tower provides heat sources for a feed preheater of the dehydration tower, a reboiler of the refining tower and a reboiler of the dealdehyding side tower, and the heat of the condensate in the dehydration tower is recovered, so that the energy consumption of the refined ethylene oxide system is reduced.
The process for refining the ethylene oxide by adopting the system comprises the following steps: the ethylene oxide aqueous solution from the upstream feeding stripping tower enters the upper middle part of the dehydration tower through a feeding pipeline after passing through a dehydration tower feeding heat exchanger, the ethylene oxide gas is taken as refined feeding from a chimney tray at the top of the dehydration tower to be removed from the refining tower, a dehydration tower reboiler heat source is steam, tower bottom liquid is water for removing ethylene oxide, the tower bottom liquid is pressurized through a dehydration tower bottom liquid pump and then is removed from a dehydration tower feeding preheater, a refining tower reboiler and a de-acetaldehyde side tower reboiler to provide heat source for heat recovery, and then is cooled through a dehydration tower bottom liquid cooler and then is removed from a re-absorption tower to be recycled as absorption water.
Ethylene oxide gas enters the refining tower from a chimney tray at the top of the dehydration tower. The tower top of the refining tower adopts a tower tray to the extraction section of the ethylene oxide product and the ethylene oxide containing acetaldehyde, the middle part between the extraction of the ethylene oxide and the extraction of the de-acetaldehyde adopts 3 sections of high-efficiency low-pressure-drop regular corrugated stainless steel filler, and compared with the tower tray of the traditional ethylene oxide refining tower, the pressure drop of the tower can be greatly reduced, and the energy consumption of a refining system is reduced.
The ethylene oxide gas at the top of the refining tower is condensed by a tower top condenser, the ethylene oxide gas with formaldehyde and non-condensable gas at the tail end is returned to the upstream of the ethylene oxide refining system to remove formaldehyde, and condensate is removed from a reflux tank of the refining tower and is returned to the top of the refining tower as reflux by a reflux pump at the top of the refining tower. The traditional process formaldehyde produces ethylene glycol through a liquid-phase emission ethylene glycol removal reaction system, the emission amount is about 10% of the amount of ethylene oxide fed, the actual operation adopts gas-phase formaldehyde removal, and the product yield of an ethylene oxide refining system is greatly improved.
The ethylene oxide product is cooled by an ethylene oxide product cooler after being drawn from the side stream and then removed to an ethylene oxide tank area.
The middle-lower acetaldehyde-rich section side line of the refining tower is collected to obtain an acetaldehyde-removing side line tower, the acetaldehyde-removing ethylene oxide gas at the top of the acetaldehyde-removing side line tower is returned to the gas phase space of the extraction tray of the refining tower, the high-acetaldehyde-content ethylene oxide in the tower bottom is mixed with a small amount of cooled dehydration tower bottom liquid by an aldehyde-containing discharge mixer, and then the mixture is removed to an ethylene glycol reactor to produce ethylene glycol and discharged out of an ethylene oxide refining system. The discharge of aldehyde-containing ethylene oxide is about 10% of the ethylene oxide feeding amount of the refining system, the acetaldehyde impurity can be highly concentrated by adding the acetaldehyde-removing side line tower, the discharge of aldehyde-containing ethylene oxide is about 1.5% of the ethylene oxide feeding amount of the refining system, and the product yield is improved by about 8.5%.
According to another exemplary embodiment of the present application, there is provided a method for efficiently purifying ethylene oxide, using the system for efficiently purifying ethylene oxide as described above, the method comprising:
s1, dehydrating an ethylene oxide raw material to obtain a dehydrated gas phase;
s2, refining the dehydrated gas phase to obtain an acetaldehyde-rich liquid phase, refluxing and refining ethylene oxide;
in some embodiments, the refining operating pressure ranges from 0.17MPaG to 0.25MPaG.
S3, removing acetaldehyde from the acetaldehyde-rich liquid phase to obtain gas-phase ethylene oxide;
in some embodiments, the operating pressure for the de-acetaldehyde is in the range of 0.17MPaG to 0.25MPaG.
S4, recycling the gas-phase ethylene oxide to the refining;
s5, recycling the reflux to the refining.
One or more technical solutions in the embodiments of the present application at least have the following technical effects or advantages:
(1) The system provided by the embodiment of the application adopts the gas phase formaldehyde removal measure at the tail end of the refining tower top condenser and the acetaldehyde removal side line tower measure, so that the ethylene oxide yield of the ethylene oxide refining system can be greatly improved, and compared with the traditional ethylene oxide refining method, the ethylene oxide refining method can be improved by 18.5%, is particularly suitable for an ethylene glycol device and an ethylene glycol co-production ethylene oxide device to convert into an ethylene oxide device, and can be used for greatly improving the ethylene oxide yield of the device;
(2) The feeding preheater of the system provided by the embodiment of the application adopts a half-welded or full-welded stainless steel plate type heat exchanger and a pipeline behind the heat exchanger adopts a design with short length and high flow speed, so that the heat exchange efficiency is improved, the hydrolysis probability of ethylene oxide at high temperature is reduced, and the yield of the ethylene oxide of the whole device can be improved.
Finally, it is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A system for efficiently refining ethylene oxide, the system comprising:
the dehydration tower comprises a dehydration tower body and a dehydration tower reboiler, wherein the dehydration tower reboiler is communicated with the dehydration tower body and used for reboiling tower kettle liquid;
a feed line communicating with the dehydration column body for providing a reaction feedstock thereto;
the refining tower comprises a refining tower body, a condensation reflux unit and a refining tower reboiler, wherein the refining tower body is communicated with the dehydration tower body and is used for receiving gas-phase feed and providing tower top reflux for the dehydration tower body; the condensing reflux unit is communicated with the refining tower body to provide tower top reflux for the refining tower body, and the refining tower reboiler is communicated with the refining tower body to reboil tower bottom liquid;
the product discharging pipeline is communicated with the refining tower body and used for outputting products;
the dealdehyding side column comprises a side column body and a side column reboiler, wherein the side column body is communicated with the refining column body and is used for receiving an acetaldehyde-rich liquid phase and a returned gas phase.
2. The system for efficient refining of ethylene oxide as recited in claim 1, wherein the dehydration column body and the refining column reboiler are stacked, the refining column body is disposed above the dehydration column body, and a chimney tray is employed between the refining column body and the dehydration column body for division.
3. A system for the efficient purification of ethylene oxide as claimed in claim 1, wherein said feed line is provided with a feed preheater for heating the reaction feed.
4. A system for the efficient refining of ethylene oxide as claimed in claim 3, wherein the feed preheater is a half-welded or full-welded plate heat exchanger.
5. The system for efficient refining of ethylene oxide of claim 1, further comprising a heat recovery line for recovering heat from the dehydration column body bottoms condensate, an inlet end of the heat recovery line being in communication with the dehydration column body, and an outlet end of the heat recovery line being in communication with the refining column reboiler and the side column reboiler, respectively.
6. The system for efficient refining of ethylene oxide as recited in claim 1, wherein the refining column body includes an upper section, a lower section, and a middle section, trays are disposed in the upper section and the lower section, and packing is disposed in the middle section.
7. The system for highly efficient purification of ethylene oxide as claimed in claim 1, wherein the condensate reflux unit is provided with a formaldehyde discharge line for discharging formaldehyde in the gas phase.
8. A method for efficiently purifying ethylene oxide, characterized in that the system for efficiently purifying ethylene oxide according to any one of claims 1 to 7 is employed, comprising:
dehydrating an ethylene oxide raw material to obtain a dehydrated gas phase;
refining the dehydrated gas phase to obtain an acetaldehyde-rich liquid phase, refluxing and refining ethylene oxide;
removing acetaldehyde from the acetaldehyde-rich liquid phase to obtain gas-phase ethylene oxide;
recycling the vapor phase ethylene oxide to the refining;
recycling the reflux to the refining.
9. The method for highly efficient purification of ethylene oxide according to claim 8, wherein the operating pressure of the purification ranges from 0.17mpa g to 0.25mpa g.
10. The method for highly efficient purification of ethylene oxide according to claim 8, characterized in that the operating pressure for the de-ethanizing ranges from 0.17mpa g to 0.25mpa g.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210320163.2A CN116920440A (en) | 2022-03-29 | 2022-03-29 | System and method for efficiently refining ethylene oxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210320163.2A CN116920440A (en) | 2022-03-29 | 2022-03-29 | System and method for efficiently refining ethylene oxide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116920440A true CN116920440A (en) | 2023-10-24 |
Family
ID=88392754
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210320163.2A Pending CN116920440A (en) | 2022-03-29 | 2022-03-29 | System and method for efficiently refining ethylene oxide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116920440A (en) |
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2022
- 2022-03-29 CN CN202210320163.2A patent/CN116920440A/en active Pending
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