CN104974113A - System and method for cooling ethylene oxide absorption water on EO/EG device - Google Patents
System and method for cooling ethylene oxide absorption water on EO/EG device Download PDFInfo
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- CN104974113A CN104974113A CN201410131336.1A CN201410131336A CN104974113A CN 104974113 A CN104974113 A CN 104974113A CN 201410131336 A CN201410131336 A CN 201410131336A CN 104974113 A CN104974113 A CN 104974113A
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- water
- ethylene oxide
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- absorption water
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- 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
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D301/00—Preparation of oxiranes
- C07D301/32—Separation; Purification
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Abstract
The invention discloses a system and a method for cooling ethylene oxide absorption water on an EO/EG device. An absorption water pre-/post-cooler is arranged in the system; the bottom of an ethylene oxide desorption tower is connected with a tower bottom pump, the absorption water pre-/post-cooler, a lean/rich liquid heat exchanger and a circulating water cooler; the circulating water cooler is sequentially connected with the absorption water pre-/post-cooler and an absorption water circulating pump and then connected with the upper part of an ethylene oxide absorption tower; and the bottom of the ethylene oxide absorption tower is connected with the lean/rich liquid heat exchanger and then connected with the upper part of the ethylene oxide desorption tower. The method comprises the following steps: increasing the pressure of the lean ethylene oxide absorption water of a tower pot of the ethylene oxide desorption tower, and cooling with the absorption water pre-/post-cooler, the lean/rich liquid heat exchanger and the circulating water cooler; and further cooling and increasing pressure in the absorption water pre-/post-cooler, and returning to the ethylene oxide absorption tower for recycling. The system and method disclosed by the invention have the advantages of small investment, good flow, less land occupation and low energy consumption and can be used for controlling and reducing the concentration of ethylene oxide on the top of the ethylene oxide absorption tower.
Description
Technical field
The present invention relates to ethylene oxide/ethylene glycol (EO/EG) production field, furtherly, relate to the system and method a kind of EO/EG device cooling ethylene oxide absorption water.
Background technology
At present, the air method direct oxidation technology that the SD(of domestic routine i.e. U.S. Halcon mono-SD in 1958 develops) the EO/EG device of technology, the ethylene oxide concentration on ethylene oxide absorber top is generally higher than design load.(see accompanying drawing 1) its major cause has:
It is high that device produces load; Ethylene oxide absorber internals efficiency does not reach design requirements; Ethylene oxide absorption water temp affects significantly by circulating cooling water temp.Usually require that the ethylene oxide concentration on ethylene oxide absorber top controls at below 70ppm mol, too high tower top ethylene oxide concentration not only affects the selectivity of reacting ethylene oxide, cause raw material consumption to increase and be unfavorable for the security of device, constraining the production at high load of device.
Therefore find a kind of investment low, flow process is excellent, and take up an area and economize, the method for the control ethylene oxide absorber top ethylene oxide concentration of good reliability is that current ethylene oxide/ethylene glycol plant needs problem demanding prompt solution.
And to reduce ethylene oxide absorption water temp be the simplest also one of the most effective way.What adopt in the technical process improvement of currently available technology is indirect cooling-type, needs a water at low temperature loop.Namely first use handpiece Water Chilling Units to prepare low-temperature cold water, then return water at low temperature storage tank after going to cool poor ethylene oxide absorption water with low-temperature cold water, then send unit cooler (see accompanying drawing 2) again back to pump boosting.Existing patent CN101037424A, provides a kind of method reducing ethylene oxide absorber absorption liquid feeding temperature, adopts refrigerator, poor absorption liquid water cooler to cool oxyethane desorption tower tower reactor poor absorption liquid out successively; In addition, described poor absorption liquid after refrigerator, the cooling of poor absorption liquid water cooler, then cools further through poor receipts liquid aftercooler, then enters ethylene oxide absorber; The water at low temperature that described poor absorption liquid aftercooler produces using refrigerator is as heat-eliminating medium; And refrigerator uses the waste heat of oxyethane desorption tower tower reactor poor absorption liquid to be out thermal source, the water at low temperature of generation is supplied to poor absorption liquid aftercooler by water at low temperature loop, and its defect is:
1. the equipment number of units of this flow scheme design needs is more, and facility investment is larger with occupation of land.
2. the temperature of poor ethylene oxide absorption water controls to need to realize sensitive not by Indirect method low-temperature cold water temperature.
3. owing to being that indirectly cooling exists secondary heat exchange process of cooling thus causes loss of refrigeration capacity and then add energy consumption.
4. low-temperature cold water is a closed loop, and need with pump circulation, process cost is high, and reliability is not enough.
Summary of the invention
For solving produced problem in prior art, the invention provides the system and method a kind of EO/EG device cooling ethylene oxide absorption water.The present invention invests low, and flow process is excellent, and take up an area and economize, energy consumption is low, and the control of good reliability also reduces the ethylene oxide concentration on ethylene oxide absorber top.
An object of the present invention is to provide the system a kind of EO/EG device cooling ethylene oxide absorption water.
Comprise: ethylene oxide absorber, oxyethane desorption tower and lean/rich liquid interchanger,
Be provided with in described system and absorb the front/rear water cooler of water;
Connect column bottoms pump bottom oxyethane desorption tower, absorb the front/rear water cooler of water, lean/rich liquid interchanger, water recirculator; Water recirculator connects the front/rear water cooler of absorption water, top, absorption water-circulating pump back clevis oxidative ethane absorption tower successively;
Lean/rich liquid interchanger back clevis oxidative ethane desorption tower top is connected bottom ethylene oxide absorber;
The described front/rear water cooler of absorption water is lithium bromide absorption refrigerating set.
The described hot side of the front/rear water cooler of absorption water is provided with the bypass of a temperature regulating three-way valve.
Two of object of the present invention is to provide a kind of method EO/EG device cooling ethylene oxide absorption water.
Comprise:
After the poor ethylene oxide absorption water boosting of oxyethane desorption tower tower reactor, after the front/rear water cooler of absorption water, lean/rich liquid interchanger and water recirculator cooling, preferably be cooled to 36-37 DEG C, then enter and absorb that water front/rear water cooler cools further, return ethylene oxide absorber after supercharging and recycle.
Specifically comprise the following steps:
A. the gas being rich in oxyethane that ethylene oxide reactor produces enters ethylene oxide absorber, is washed by oxyethane wherein with poor ethylene oxide absorption water;
B. the overhead gas of ethylene oxide absorber returns reacting ethylene oxide system, and the rich ethylene oxide absorption water of tower reactor sends into oxyethane desorption tower after the preheating of lean/rich liquid interchanger;
C. oxyethane desorption tower stripped overhead goes out oxyethane and delivers to the process of follow-up workshop section;
D. after the poor ethylene oxide absorption water of oxyethane desorption tower tower reactor boosts, after being cooled to 36-37 DEG C respectively by the front/rear water cooler of absorption water, lean/rich liquid interchanger and water recirculator, enter again and absorb after water front/rear water cooler cools further, return ethylene oxide absorber recycle through absorbing the further supercharging of water-circulating pump.
The described front/rear water cooler of absorption water preferably adopts integrated lithium bromide absorption refrigerating set, the required hot water of its refrigeration is the poor EO absorption water from the oxyethane desorption tower tower reactor without cooling, typical temperature, but also may be higher at 110 DEG C, depends on the pressure of oxyethane desorption tower.The cold water (cooled medium) of preparation is absorb water through the cooled poor EO of water recirculator.
Described poor ethylene oxide absorption water after a series of heat exchange cooling, then is cooled to about 32 DEG C in the front/rear water cooler of absorption water, returns ethylene oxide absorber through pump boosting Posterior circle.
As mentioned above, the realization of present method only needs on the poor ethylene oxide absorption water piping system of existing SD technology EO/EG device, increase by one and absorbs the front/rear water cooler of water, this equipment is integrated lithium bromide absorption refrigerating set, and make the poor ethylene oxide absorption water temp through this unit be reduced to about 32 DEG C, thus realization controls and reduces the object of ethylene oxide absorber top ethylene oxide concentration.
The present invention absorbs the front/rear water cooler of water by arranging, and can reach the effect with needing cooled poor EO to absorb water integrated refrigerating cooling self.Namely absorb while water prepares cold by unit cooler without the poor EO of cooling and be cooled, and the cold made in unit, be directly cooled through a series of heat exchange simultaneously after poor EO absorb water, thus reach and prepare the object that the poor EO of low temperature absorbs water.Therefore this system of water at low temperature loop is not needed.Also the deficiency because indirectly cooling required water at low temperature loop of the prior art is just avoided.
Method of the present invention not only can be used in the transformation of the EO/EG device of existing SD technology, also can be applied to the EO/EG device similar with its technical process transformation or newly-built on.
The technique effect that the present invention gives prominence to is:
1. adopt system and method for the present invention, greatly can reduce the ethylene oxide concentration on ethylene oxide absorber top, can be controlled in 50ppm about mol, improve the selectivity of reacting ethylene oxide, reach the effect of cutting down the consumption of raw materials;
2. the present invention can realize the function absorbing water integrated refrigerating cooling self with poor EO, thus realization flow optimization, reduce the effect of energy consumption;
3. what is more important this invention removes the potential safety hazard that device causes because tower top ethylene oxide concentration is too high when improving and producing load;
4. the present invention is production at high load and expands further and can create condition, and then improves the economic benefit level of device.
Accompanying drawing explanation
Ethylene oxide absorption/desorption process the schematic diagram of Fig. 1 routine
The schematic diagram of Fig. 2 prior art cooling ethylene oxide absorption water
The system schematic of Fig. 3 cooling ethylene oxide absorption of the present invention water
Description of reference numerals:
1 ethylene oxide absorber; 2 oxyethane desorption towers; 3 oxyethane desorb tower top water coolers; 4 oxyethane desorption tower return tanks; 5 oxyethane desorption tower reflux pumps; 6 oxyethane desorption tower reboiler; 7 column bottoms pumps; 8 lean/rich liquid interchanger; 9 water recirculators; 10 poor ethylene oxide absorption water-circulating pumps; 11 lithium bromide adsorption water chilling units; 12 poor ethylene oxide absorption water aftercoolers; 13 low-temperature cold water basins; 14 low-temperature cold water recycle pumps; 15 absorb the front/rear water cooler of water.
Embodiment
Below in conjunction with embodiment, further illustrate the present invention.
Embodiment:
As shown in Figure 3, a kind of EO/EG device cools the system of ethylene oxide absorption water, ethylene oxide absorber 1, oxyethane desorption tower 2 and lean/rich liquid interchanger 8, be provided with in described system and absorb the front/rear water cooler 15 of water; Connect column bottoms pump 7 bottom oxyethane desorption tower 2, absorb the front/rear water cooler of water 15, lean/rich liquid interchanger 8, water recirculator 9; Water recirculator 9 connects the front/rear water cooler 15 of absorption water successively, absorbs top, water-circulating pump 10 back clevis oxidative ethane absorption tower 1; Lean/rich liquid interchanger 8 back clevis oxidative ethane desorption tower 2 top is connected bottom ethylene oxide absorber 1; The front/rear water cooler 15 of described absorption water is lithium bromide absorption refrigerating set, and the described hot side of the front/rear water cooler of absorption water 15 is provided with the bypass of a temperature regulating three-way valve.
The oxyethane that ethylene oxide reactor generates is absorbed by poor ethylene oxide absorption water in tower 1, the rich ethylene oxide absorption water of tower reactor sends into oxyethane desorption tower 2 after the preheating of lean/rich liquid interchanger 8, after tower top water cooler 3 cools, follow-up workshop section is out sent to refine at this oxyethane by stripping, and after poor ethylene oxide absorption water ethane via epoxyethane desorb column bottoms pump 7 boosting of tower reactor, be introduced into and absorb the front/rear water cooler 15 of water, it is cooled while this prepares cold as thermal source, then after being cooled to 37 DEG C further by lean/rich liquid interchanger 8 and poor ethylene oxide absorption watercooler 9, enter into the front/rear water cooler 15 of absorption water again and be cooled to 32 DEG C further, ethylene oxide absorber 1 is returned after eventually passing the further supercharging of poor ethylene oxide absorption water-circulating pump 10.By changing the amount entering the poor ethylene oxide absorption water absorbing the hot side of the front/rear water cooler of water, regulate the poor ethylene oxide absorption water outlet temperature of cold side.
The EO concentration of ethylene oxide absorber tower top is basically stable at 50ppm mol.
Comparative example:
The EO/EG device of prior art, as shown in Figure 2, poor EO for ethylene oxide absorber absorbs and water temp summer minimumly can only control at 37 DEG C, in addition device operates for a long time under 110% load, therefore the EO concentration absorbing tower top maintains 500ppm mol substantially, is far longer than the 70ppm mol of initial design.
As can be seen from embodiment and comparative example, the flow process before the present invention is comparatively more excellent, is presented as and can saves facility investment, saves and takes up an area, and reduces energy consumption, and improves reliability and the handiness of operation.
Claims (6)
1. EO/EG device cools a system for ethylene oxide absorption water, comprising: ethylene oxide absorber, oxyethane desorption tower and lean/rich liquid interchanger, is characterized in that:
Be provided with in described system and absorb the front/rear water cooler of water;
Connect column bottoms pump bottom oxyethane desorption tower, absorb the front/rear water cooler of water, lean/rich liquid interchanger, water recirculator; Water recirculator connects the front/rear water cooler of absorption water, top, absorption water-circulating pump back clevis oxidative ethane absorption tower successively;
Lean/rich liquid interchanger back clevis oxidative ethane desorption tower top is connected bottom ethylene oxide absorber;
The described front/rear water cooler of absorption water is lithium bromide absorption refrigerating set.
2. EO/EG device as claimed in claim 1 cools the system of ethylene oxide absorption water, it is characterized in that:
The described hot side of the front/rear water cooler of absorption water is provided with the bypass of a temperature regulating three-way valve.
3. adopt the method EO/EG device as described in one of claim 1 ~ 2 cooling the system of ethylene oxide absorption water, it is characterized in that described method comprises:
After the poor ethylene oxide absorption water boosting of oxyethane desorption tower tower reactor, after absorption water front/rear water cooler, lean/rich liquid interchanger and water recirculator cooling, then enter and absorb that the front/rear water cooler of water cools further, return ethylene oxide absorber after supercharging and recycle.
4. EO/EG device as claimed in claim 3 cools the method for ethylene oxide absorption water, it is characterized in that:
After the poor ethylene oxide absorption water boosting of oxyethane desorption tower tower reactor, after being cooled to 36-37 DEG C respectively by the front/rear water cooler of absorption water, lean/rich liquid interchanger and water recirculator, then enter the front/rear water cooler of absorption water.
5. EO/EG device as claimed in claim 4 cools the method for ethylene oxide absorption water, it is characterized in that described method comprises:
A. the gas being rich in oxyethane that ethylene oxide reactor produces enters ethylene oxide absorber, is washed by oxyethane wherein with poor ethylene oxide absorption water;
B. the overhead gas of ethylene oxide absorber returns reacting ethylene oxide system, and the rich ethylene oxide absorption water of tower reactor sends into oxyethane desorption tower after the preheating of lean/rich liquid interchanger;
C. oxyethane desorption tower stripped overhead goes out oxyethane and delivers to the process of follow-up workshop section;
D. after the poor ethylene oxide absorption water of oxyethane desorption tower tower reactor boosts, after being cooled to 36-37 DEG C respectively by the front/rear water cooler of absorption water, lean/rich liquid interchanger and water recirculator, enter again and absorb after water front/rear water cooler cools further, return ethylene oxide absorber recycle through absorbing the further supercharging of water-circulating pump.
6. EO/EG device as claimed in claim 5 cools the method for ethylene oxide absorption water, it is characterized in that:
By changing the amount entering the poor ethylene oxide absorption water in hot side absorbing the front/rear water cooler of water, regulate the poor ethylene oxide absorption water outlet temperature of cold side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410131336.1A CN104974113B (en) | 2014-04-02 | 2014-04-02 | System and method for cooling ethylene oxide absorption water on EO/EG device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410131336.1A CN104974113B (en) | 2014-04-02 | 2014-04-02 | System and method for cooling ethylene oxide absorption water on EO/EG device |
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| CN104974113A true CN104974113A (en) | 2015-10-14 |
| CN104974113B CN104974113B (en) | 2017-02-01 |
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| CN201410131336.1A Active CN104974113B (en) | 2014-04-02 | 2014-04-02 | System and method for cooling ethylene oxide absorption water on EO/EG device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111233793A (en) * | 2020-03-13 | 2020-06-05 | 荏原冷热系统（中国）有限公司 | System and method for reducing temperature of ethylene oxide absorption liquid in EO/EG device and EO/EG device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86105706A (en) * | 1985-07-03 | 1987-02-25 | 日本触媒化学工业株式会社 | Method for purification ethylene oxide |
| DE20300663U1 (en) * | 2003-01-16 | 2004-08-12 | Farmatic Biotech Energy Ag | Assembly to remove carbon dioxide and hydrogen sulfide from methane biogas by compression and release into an absorption column |
| CN101037424A (en) * | 2007-04-27 | 2007-09-19 | 中国石油化工股份有限公司 | Device and method for reducing temperature of poor-absorption liquid feed material of Ethylene Oxide absorption tower |
| CN101260093A (en) * | 2008-03-21 | 2008-09-10 | 中国石油集团工程设计有限责任公司东北分公司 | Modified epoxy ethane washing technique for epoxy ethane/ethylene glycol producing device |
| CN101561198A (en) * | 2008-04-14 | 2009-10-21 | 山东飞达化工科技有限公司 | Cooling method by utilizing lithium bromide unit |
-
2014
- 2014-04-02 CN CN201410131336.1A patent/CN104974113B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86105706A (en) * | 1985-07-03 | 1987-02-25 | 日本触媒化学工业株式会社 | Method for purification ethylene oxide |
| DE20300663U1 (en) * | 2003-01-16 | 2004-08-12 | Farmatic Biotech Energy Ag | Assembly to remove carbon dioxide and hydrogen sulfide from methane biogas by compression and release into an absorption column |
| CN101037424A (en) * | 2007-04-27 | 2007-09-19 | 中国石油化工股份有限公司 | Device and method for reducing temperature of poor-absorption liquid feed material of Ethylene Oxide absorption tower |
| CN101260093A (en) * | 2008-03-21 | 2008-09-10 | 中国石油集团工程设计有限责任公司东北分公司 | Modified epoxy ethane washing technique for epoxy ethane/ethylene glycol producing device |
| CN101561198A (en) * | 2008-04-14 | 2009-10-21 | 山东飞达化工科技有限公司 | Cooling method by utilizing lithium bromide unit |
Non-Patent Citations (1)
| Title |
|---|
| 张春秀 等: "乙二醇装置环氧乙烷汽提塔问题分析及改造效果", 《石化技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111233793A (en) * | 2020-03-13 | 2020-06-05 | 荏原冷热系统（中国）有限公司 | System and method for reducing temperature of ethylene oxide absorption liquid in EO/EG device and EO/EG device |
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| CN104974113B (en) | 2017-02-01 |
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