CN210765075U - Condensate utilization system of butadiene extraction unit - Google Patents
Condensate utilization system of butadiene extraction unit Download PDFInfo
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- CN210765075U CN210765075U CN201921567258.4U CN201921567258U CN210765075U CN 210765075 U CN210765075 U CN 210765075U CN 201921567258 U CN201921567258 U CN 201921567258U CN 210765075 U CN210765075 U CN 210765075U
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Abstract
The utility model discloses a butadiene extracts unit lime set and utilizes system, including first extraction rectifying tower, second extraction rectifying tower, thick butadiene scrubbing tower, butadiene dehydration tower, butadiene rectifying tower, the tower bottom discharge gate of first extraction rectifying tower and the feed inlet of second extraction rectifying tower intercommunication, the tower top discharge gate of second extraction rectifying tower and the feed inlet of thick butadiene scrubbing tower intercommunication, the tower top discharge gate of thick butadiene scrubbing tower and the feed inlet of butadiene dehydration tower intercommunication, the tower bottom discharge gate of butadiene dehydration tower and butadiene rectifying tower feed inlet intercommunication; reboiler heat medium inlets of the first extraction rectifying tower and the second extraction rectifying tower are communicated with a high-temperature steam pipe, and reboiler heat medium outlets of the first extraction rectifying tower and the second extraction rectifying tower are communicated with a reboiler heat medium inlet of the butadiene rectifying tower. The utility model discloses avoid calorific loss, reduced energy consumption, also reduced the production of high temperature lime set.
Description
The technical field is as follows:
the utility model relates to a butadiene extracts unit lime set and utilizes system belongs to coal chemical industry field.
Background art:
butadiene is colorless and slightly garlic-like gas at normal temperature and normal pressure, the normal pressure boiling point is-4.4 ℃, the butadiene is mainly used for producing synthetic rubber, for example, butadiene and styrene can be copolymerized to produce butadiene-styrene rubber, butadiene can be subjected to directional polymerization reaction under the action of a catalyst to produce butadiene rubber, butadiene and acrylonitrile are copolymerized to produce nitrile-butadiene rubber and the like.
The production method of butadiene mainly adopts an acetonitrile method, the production system comprises an MTBE unit, an oxidative dehydrogenation unit and a butadiene extraction unit, and the butadiene extraction unit comprises a first extraction rectifying tower, a second extraction rectifying tower, a crude butadiene water washing tower, a butadiene dehydrating tower and a butadiene rectifying tower; crude butadiene containing maleic, fumaric, butane, ethylene and acetylene from the oxidative dehydrogenation unit is extracted and rectified by a first extraction rectifying tower and a second extraction rectifying tower (the extractant is acetonitrile) to obtain crude butadiene with the purity of more than 95 percent, then the crude butadiene enters a crude butadiene washing tower, is washed by water to remove acetonitrile, then enters a dehydration tower and a butadiene rectifying tower, is dehydrated and purified to remove trace maleic and fumaric to obtain a butadiene product with the purity of more than 99.5 percent.
The problems of the existing butadiene extraction unit are as follows: reboilers of the first extraction rectifying tower, the second extraction rectifying tower and the butadiene rectifying tower are heated by high-temperature steam (260 ℃), and high-temperature condensate (120 ℃) after heat exchange is air-cooled and then sent out of the factory, so that water and heat are wasted; and the crude butadiene water washing tower in the butadiene extraction unit requires that the water inlet temperature is 40 ℃, and the existing butadiene water washing tower adopts the mode that water is injected and heated and then the crude butadiene water washing tower is washed, so that the energy consumption is higher.
The utility model has the following contents:
in order to solve the technical problem, the utility model aims to provide a butadiene extraction unit lime set utilizes system.
The utility model discloses by following technical scheme implement: a condensate utilization system of a butadiene extraction unit comprises a first extraction rectifying tower, a second extraction rectifying tower, a crude butadiene washing tower, a butadiene dehydration tower and a butadiene rectifying tower, wherein a tower bottom discharge hole of the first extraction rectifying tower is communicated with a feed inlet of the second extraction rectifying tower, a tower top discharge hole of the second extraction rectifying tower is communicated with a feed inlet of the crude butadiene washing tower, a tower top discharge hole of the crude butadiene washing tower is communicated with a feed inlet of the butadiene dehydration tower, and a tower bottom discharge hole of the butadiene dehydration tower is communicated with a feed inlet of the butadiene rectifying tower;
reboiler heat medium inlets of the first extractive distillation tower and the second extractive distillation tower are communicated with a high-temperature steam pipe, and reboiler heat medium outlets of the first extractive distillation tower and the second extractive distillation tower are communicated with a reboiler heat medium inlet of the butadiene distillation tower.
And further, the device also comprises a buffer tank, wherein a water inlet of the buffer tank is respectively communicated with a water injection pipe and a reboiler heat medium outlet of the butadiene rectifying tower, and a water outlet of the buffer tank is communicated with a water inlet of the crude butadiene washing tower.
The utility model has the advantages that: the utility model discloses the high temperature lime set after material and first extraction rectifying tower and the heat transfer of second extraction rectifying tower carries out the heat transfer in the well butadiene rectifying tower, because butadiene rectifying tower bottom material requires the temperature to be lower, only 55 ℃, the high temperature lime set that produces after first extraction rectifying tower and the heat transfer of second extraction rectifying tower can satisfy the heat transfer requirement of demand butadiene rectifying tower completely, consequently the utility model discloses for the problem that the steam consumption that butadiene rectifying tower leads to with the high temperature steam heat transfer is big among the traditional butadiene extraction unit, moreover make full use of the heat in the high temperature lime set, avoided calorific loss, reduced energy consumption, also reduced the production of high temperature lime set.
The high-temperature condensate is mixed with water injection, the flow proportion of the condensate and the water injection is adjusted to keep the water temperature at 40 ℃, and the condensate enters the crude butadiene washing tower for washing operation, so that the problem of large water consumption in washing after water injection heating of the washing tower of the traditional butadiene extraction unit is solved; and the high-temperature condensate after heat exchange and the heat thereof are fully utilized, and the energy consumption is reduced.
Description of the drawings:
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a system diagram of an embodiment.
In the figure: the device comprises a first extraction rectifying tower 1, a second extraction rectifying tower 2, a crude butadiene washing tower 3, a butadiene dehydrating tower 4, a butadiene rectifying tower 5, a buffer tank 6, a high-temperature steam pipe 7 and a water injection pipe 8.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
A condensation liquid utilization system of a butadiene extraction unit comprises a first extraction rectifying tower 1, a second extraction rectifying tower 2, a crude butadiene washing tower 3, a butadiene dehydrating tower 4, a butadiene rectifying tower 5 and a buffer tank 6, wherein a tower bottom discharge port of the first extraction rectifying tower 1 is communicated with a feed port of the second extraction rectifying tower 2, a tower top discharge port of the second extraction rectifying tower 2 is communicated with a feed port of the crude butadiene washing tower 3, a tower top discharge port of the crude butadiene washing tower 3 is communicated with a feed port of the butadiene dehydrating tower 4, and a tower bottom discharge port of the butadiene dehydrating tower 4 is communicated with a feed port of the butadiene rectifying tower 5;
reboiler hot medium inlets of the first extraction rectifying tower 1 and the second extraction rectifying tower 2 are communicated with a high temperature steam pipe 7, reboiler hot medium outlets of the first extraction rectifying tower 1 and the second extraction rectifying tower 2 and a water injection pipe 8 are communicated with a water inlet of a buffer tank 6, and a water outlet of the buffer tank 6 is communicated with a water inlet of a crude butadiene washing tower 3.
The working principle is as follows:
1. the temperature of the bottom of the first extractive distillation tower 1 is normally controlled at 120 ℃, saturated steam of 1.0Mpa and 180 ℃ is used in the tower kettle to supply heat through a reboiler, and low-pressure steam of 1.0Mpa is subjected to heat exchange to form high-temperature condensate of 0.3Mpa and 120 ℃.
2. The temperature of the tower bottom of the second extractive distillation tower 2 is 142 ℃, saturated steam of 1.0Mpa and 180 ℃ is used in the tower kettle to supply heat through a reboiler, and low-pressure steam of 1.0Mpa is subjected to heat exchange to form high-temperature condensate of 0.3Mpa and 120 ℃.
3. The temperature of the bottom of the butadiene rectifying tower 5 is controlled to be about 55 ℃, high-temperature condensate of 120 ℃ obtained by heat exchange of the first extractive rectifying tower 1 and the second extractive rectifying tower 2 is collected and used as a heat source of the butadiene rectifying tower 5, and heat exchange is carried out through a reboiler.
4. The crude butadiene water washing column 3 uses hot water of 40 ℃ as washing water. The high-temperature condensate becomes a low-temperature condensate of 70 ℃ after heat exchange of a reboiler of the butadiene rectifying tower 5, and then is cooled to 40 ℃ through condensate to be used as washing water of the crude butadiene washing tower 3.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A condensed liquid utilization system of a butadiene extraction unit comprises a first extraction rectifying tower, a second extraction rectifying tower, a crude butadiene washing tower, a butadiene dehydration tower and a butadiene rectifying tower, wherein a tower bottom discharge hole of the first extraction rectifying tower is communicated with a feed inlet of the second extraction rectifying tower, a tower top discharge hole of the second extraction rectifying tower is communicated with a feed inlet of the crude butadiene washing tower, a tower top discharge hole of the crude butadiene washing tower is communicated with a feed inlet of the butadiene dehydration tower, and a tower bottom discharge hole of the butadiene dehydration tower is communicated with a feed inlet of the butadiene rectifying tower;
the heat medium inlets of the reboilers of the first extractive distillation tower and the second extractive distillation tower are communicated with a high-temperature steam pipe, and the heat medium outlets of the reboilers of the first extractive distillation tower and the second extractive distillation tower are communicated with the heat medium inlet of the reboilers of the butadiene distillation tower.
2. The system for utilizing the condensate of the butadiene extraction unit of claim 1, further comprising a buffer tank, wherein a water inlet of the buffer tank is respectively communicated with a water injection pipe and a reboiler heat medium outlet of the butadiene rectifying tower, and a water outlet of the buffer tank is communicated with a water inlet of the crude butadiene washing tower.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921567258.4U CN210765075U (en) | 2019-09-19 | 2019-09-19 | Condensate utilization system of butadiene extraction unit |
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| CN201921567258.4U CN210765075U (en) | 2019-09-19 | 2019-09-19 | Condensate utilization system of butadiene extraction unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114949896A (en) * | 2022-05-25 | 2022-08-30 | 宁波新溶聚企业管理合伙企业(有限合伙) | Heat energy utilization device and heat energy utilization method for solution polymerized styrene butadiene rubber rectification system |
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2019
- 2019-09-19 CN CN201921567258.4U patent/CN210765075U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114949896A (en) * | 2022-05-25 | 2022-08-30 | 宁波新溶聚企业管理合伙企业(有限合伙) | Heat energy utilization device and heat energy utilization method for solution polymerized styrene butadiene rubber rectification system |
| CN114949896B (en) * | 2022-05-25 | 2023-10-13 | 宁波新溶聚企业管理合伙企业(有限合伙) | Heat energy utilization device and heat energy utilization method for solution polymerized styrene-butadiene rubber rectification system |
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