CN211199067U - Crude butanol recovery system - Google Patents
Crude butanol recovery system Download PDFInfo
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- CN211199067U CN211199067U CN201921805042.7U CN201921805042U CN211199067U CN 211199067 U CN211199067 U CN 211199067U CN 201921805042 U CN201921805042 U CN 201921805042U CN 211199067 U CN211199067 U CN 211199067U
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Abstract
A crude butanol recovery system comprises a crude butanol storage tank, a raw material preheater, a crude distillation tower, a first reboiler, a second reboiler, a rectification tower, a standing layering tank, a first condenser, a second condenser, a third condenser, a methanol finished product tank, a finished product storage tank, a reaction kettle and a vacuum distillation tower, wherein the crude butanol storage tank is connected with the crude distillation tower through the raw material preheater, a tower top steam outlet of the crude distillation tower is connected with a distillation tank of the crude distillation tower through a first condenser, the tower bottom of the crude distillation tower is connected with a feed inlet of a first reboiler, the first reboiler is connected with the standing layering tank through the raw material preheater and a kettle liquid cooler, the bottom of a side wall of the standing layering tank is connected with a water phase tank, the top of the side wall is connected with an oil phase tank, the oil phase tank is connected with the rectification tower through a pipeline, the tower top steam outlet of the rectification tower is connected with the distillation tank of the rectification tower through the second condenser, the tower bottom of the rectification tower is connected with the reaction, the top steam outlet of the reaction kettle is connected with a vacuum distillation tower, and the vacuum distillation tower is connected with a finished product storage tank through a third condenser.
Description
Technical Field
The utility model relates to a chemical industry field, in particular to crude butanol recovery system.
Background
BDO, 1,4 butanediol, is an important chemical feedstock. In the normal production process of the BDO device, the generated by-products and waste liquid mainly comprise BDO tar (containing BDO, THF, methanol, butanol, ethanol and the like) and crude butanol (mainly containing methanol, butanol, propanol and the like). At present, most of the treatment methods of the byproducts adopt incineration, so that the economic benefit is low, the resources are seriously wasted, and the environmental protection requirement is not met.
Therefore, how to efficiently recycle these by-products is a problem to be solved by those skilled in the art.
Disclosure of Invention
The utility model aims at prior art not enough, provide a crude butanol recovery system, its easy operation, security are high, reform transform that the investment is little and have good economic benefits, can thoroughly solve the environmental protection pressure that manufacturing enterprise brought because of producing the waste liquid, still have the advantage of environmental protection.
Realize the utility model discloses the technical scheme of purpose is: a crude butanol recovery system comprises a crude butanol storage tank, a raw material preheater, a crude distillation tower, a first reboiler, a rectifying tower, a second reboiler, a standing layering tank, a first condenser, a second condenser, a methanol finished product tank, a finished product storage tank, a reaction kettle, a vacuum distillation tower and a third condenser, wherein the crude butanol storage tank is connected with the crude distillation tower through the raw material preheater, a tower top steam outlet of the crude distillation tower is connected with a crude distillation tower distillation tank through the first condenser, the crude distillation tower distillation tank is connected with the middle part of the side wall of the crude distillation tower through a first return pipe, a return pump is arranged on the first return pipe, the crude distillation tower distillation tank is connected with the methanol finished product tank through a pipeline, the tower bottom of the crude distillation tower is connected with a feed inlet of the first reboiler, a discharge outlet of the first reboiler is connected with a medium inlet of the raw material preheater, a medium outlet of the raw material preheater is connected with the standing layering tank through a kettle liquid cooler, the lateral wall bottom of layering jar of stewing links to each other with a water phase jar, and the lateral wall top of layering jar of stewing links to each other with an oil phase jar, the oil phase jar passes through the pipeline and is connected with the rectifying column, and the top steam vent of this rectifying column passes through the second condenser and is connected with the rectifying column distillate tank, and this rectifying column distillate tank passes through the second back flow and is connected with rectifying column lateral wall middle part, is equipped with the backwash pump on the second back flow, and the tower bottom of rectifying column is connected with the feed inlet of second reboiler, the discharge gate of second reboiler with reation kettle connects, and reation kettle's top steam vent is connected with the vacuum distillation tower, the top steam vent of vacuum distillation tower is connected with the finished product storage tank through the third condenser.
The water phase tank is connected with a wastewater rectifying tower through a pipeline, a steam outlet at the top of the wastewater rectifying tower is connected with a distillation tank of the wastewater rectifying tower through a fourth condenser, the distillation tank of the wastewater rectifying tower is connected with the middle part of the side wall of the wastewater rectifying tower through a third return pipe, a reflux pump is arranged on the third return pipe, and a distillation tank of the wastewater rectifying tower is connected with a crude butanol storage tank.
The first condenser, the second condenser, the third condenser and the fourth condenser are all formed by connecting two tube-plate heat exchangers with the same specification in series.
The rectifying tower distillation groove is connected with a crude butanol storage tank.
Adopt above-mentioned technical scheme to have following beneficial effect:
1. the crude butanol recovery system comprises a crude butanol storage tank, a raw material preheater, a crude distillation tower, a first reboiler, a rectification tower, a second reboiler, a standing layering tank, a first condenser, a second condenser, a methanol finished product tank, a finished product storage tank, a reaction kettle, a vacuum distillation tower and a third condenser, wherein the crude butanol storage tank is used for temporarily storing and buffering crude butanol serving as a raw material to be separated, the raw material preheater is used for preheating the raw material to be separated, the crude distillation tower is used for separating methanol in the crude butanol, and the rectification tower is used for separating butanol in the crude butanol. The crude butanol storage tank is connected with the crude distillation tower through the raw material preheater, so that the temperature of the raw material entering the distillation tower is preheated, the load of the crude distillation tower is reduced, the raw material entering the crude distillation tower is prevented from being subjected to bumping, and the component separation is facilitated. The top steam outlet of the crude distillation tower is connected with the distillation tank of the crude distillation tower through a first condenser, the steam phase discharged from the crude distillation tower is mainly methanol after the crude butanol is primarily separated by the crude distillation tower, the distillation tank of the crude distillation tower is connected with the middle part of the side wall of the crude distillation tower through a first return pipe, and the first return pipe is provided with a reflux pump, so that the purity of the separated methanol is improved. The distillation tank of the rough distillation tower is connected with a methanol finished product tank through a pipeline, and the separated methanol is temporarily stored in the methanol finished product tank for sale or used as a raw material. The tower bottom of the rough distillation tower is connected with the feed inlet of a first reboiler, the discharge outlet of the first reboiler is connected with the medium inlet of the raw material preheater, the vapor phase (mainly methanol) generated in the first reboiler returns to the rough distillation tower to be used as the heat source of the rough distillation tower, the vapor phase is discharged and cooled and then temporarily stored in a methanol finished product tank, the discharged high-temperature liquid phase is used as the heating medium of the raw material preheater to preheat the raw material discharged from the crude butanol storage tank, the temperature of the high-temperature liquid phase is reduced, and the utilization rate of heat is effectively improved. The medium outlet of the raw material preheater is connected with the standing layering tank through the kettle liquid cooler, the crude butanol raw material after primary separation enters the standing layering tank at a low temperature after being cooled, standing and layering are carried out, the upper layer is an oil phase, the main components are butanol and a small amount of propanol, the lower layer is a water phase, and the main components are water, a small amount of butanol and propanol. The bottom of the side wall of the standing and layering tank is connected with a water phase tank and used for temporarily storing the water phase in the standing and layering tank for further treatment. The top of the side wall of the standing and layering tank is connected with an oil phase tank for temporarily storing the oil phase in the standing and layering tank. The oil phase tank is connected with the rectifying tower through a pipeline, a steam outlet at the top of the rectifying tower is connected with a distillation tank of the rectifying tower through a second condenser, a vapor phase discharged by the rectifying tower is mainly butanol, the distillation tank of the rectifying tower is connected with the middle part of the side wall of the rectifying tower through a second return pipe, and a reflux pump is arranged on the second return pipe to improve the purity of the separated butanol. The tower bottom of rectifying column is connected with the feed inlet of second reboiler, the discharge gate of second reboiler with reation kettle connects, and the vapour phase (mainly butanol) that produces in the second reboiler returns the rectifying column, as the heat source of rectifying column, discharge and temporarily store in the rectifying column distillation tank after cooling, can extract and sell or as raw materials to the outside, and the high temperature liquid phase of discharge is mainly waste water to and remain the butanol in waste water, get into reation kettle and after the colouring group such as reaction desorption acetal, the impurity that generates in the reation kettle is interrupted and is discharged, send to the burning furnace and burn. And a top steam outlet of the reaction kettle is connected with a vacuum distillation tower, a top steam outlet of the vacuum distillation tower is connected with a finished product storage tank through a third condenser, and residual butanol is obtained by recycling and is used for selling or serving as a raw material.
2. The water phase tank is connected with a wastewater rectifying tower through a pipeline, the water phase contains a small amount of propanol and butanol, a steam outlet at the top of the wastewater rectifying tower is connected with a distillation tank of the wastewater rectifying tower through a fourth condenser, the vapor phase mainly contains the butanol and the small amount of propanol, and the COD of a tower bottom liquid is less than or equal to 200 mg/L and can be directly discharged outwards.
3. The rectifying tower distillation groove is connected with a crude butanol storage tank and returns to the crude distillation tower and the rectifying tower, so that the yield of butanol is further improved.
The following further description is made with reference to the accompanying drawings and detailed description.
Drawings
Fig. 1 is a schematic connection diagram of the present invention.
In the attached drawing, 1 is a crude butanol storage tank, 2 is a raw material preheater, 3 is a crude distillation tower, 4 is a first reboiler, 5 is a rectifying tower, 6 is a second reboiler, 7 is a standing layering tank, 8 is a first condenser, 9 is a second condenser, 10 is a methanol finished product tank, 11 is a finished product storage tank, 12 is a reaction kettle, 13 is a vacuum distillation tower, 14 is a third condenser, 15 is a crude distillation tower distillation tank, 16 is a first return pipe, 17 is a kettle liquid cooler, 18 is a water phase tank, 19 is an oil phase tank, 20 is a rectifying tower distillation tank, 21 is a second return pipe, 22 is a wastewater rectifying tower, 23 is a fourth condenser, 24 is a wastewater rectifying tower distillation tank, and 25 is a third return pipe.
Detailed Description
The utility model discloses in, do not mark the equipment of concrete connection mode, go on according to conventional condition or according to the condition of firm suggestion usually, do not mark the equipment of specific model, be the conventional equipment in chemical industry field usually.
Referring to fig. 1, a specific embodiment of a crude butanol recovery system is shown. The crude butanol recovery system comprises a crude butanol storage tank 1, a raw material preheater 2, a crude distillation tower 3, a first reboiler 4, a rectifying tower 5, a second reboiler 6, a standing layering tank 7, a first condenser 8, a second condenser 9, a methanol finished product tank 10, a finished product storage tank 11, a reaction kettle 12, a vacuum distillation tower 13 and a third condenser 14. The crude butanol storage tank 1 is connected with the crude distillation tower 3 through the raw material preheater 2 to supply materials to the crude distillation tower, the crude distillation tower is a packed tower, the packing adopts stainless steel corrugated packing, the raw material preheater is a tube-plate heat exchanger, a steam outlet at the top of the crude distillation tower 3 is connected with a crude distillation tower distillation tank 15 through a first condenser 8, the first condenser is formed by connecting two tube-plate heat exchangers with the same specification in series, the crude distillation tower distillation tank 15 is connected with the middle part of the side wall of the crude distillation tower 3 through a first reflux pipe 16, a reflux pump is arranged on the first reflux pipe 16, and the crude distillation tower distillation tank 15 is connected with a methanol finished product tank 10 through a pipeline. The bottom of the coarse distillation tower 3 is connected with the feed inlet of a first reboiler 4, the first reboiler is a tube-plate heat exchanger, the discharge outlet of the first reboiler 4 is connected with the medium inlet of the raw material preheater 2, the medium outlet of the raw material preheater 2 is connected with the standing layering tank 7 through a kettle liquid cooler 17, and the kettle liquid cooler is also a tube-plate heat exchanger. The lateral wall bottom of layering jar 7 of stewing links to each other with a water phase jar 18, and in this embodiment, water phase jar 18 passes through the pipeline to be connected with a waste water rectifying column 22, to the waste water rectifying column feed, and this waste water rectifying column 22's top of the tower steam vent passes through fourth condenser 23 and is connected with waste water rectifying column rectification groove 24, and the fourth condenser comprises the tube sheet heat exchanger of two the same specifications establishes ties, waste water rectifying column rectification groove 24 is connected through the lateral wall middle part of third back flow 25 with waste water rectifying column 22, is equipped with the backwash pump on the third back flow 25, waste water rectifying column rectification groove 24 is connected with thick butanol storage tank 1. The lateral wall top of layering jar 7 that stews links to each other with an oil phase jar 19, oil phase jar 19 passes through the pipeline and is connected with rectifying column 5, to the rectifying column feed, the top of the tower steam vent of this rectifying column 5 passes through second condenser 9 and is connected with rectifying column distillate groove 20, the second condenser comprises the tube sheet heat exchanger of two the same specifications in series, this rectifying column distillate groove 20 is connected with rectifying column 5 lateral wall middle part through second back flow 21, be equipped with the backwash pump on the second back flow 21, in order to improve the recovery efficiency of butanol, rectifying column distillate groove 20 is connected with crude butanol storage tank 1. The tower bottom of rectifying column 5 is connected with the feed inlet of second reboiler 6, the discharge gate of second reboiler 6 with reation kettle 12 is connected, and reation kettle 12's top steam vent is connected with vacuum distillation tower 13, vacuum distillation tower 13's top steam vent is connected with finished product storage tank 11 through third condenser 14, and the third condenser comprises the tube sheet heat exchanger of two the same specifications establishes ties.
The process for recovering the crude butanol by the crude butanol recovery system comprises the following steps:
1) conveying a crude butanol raw material (248 Kg/h, water accounting for 42.8%, methanol accounting for 11.60%, butanol accounting for 40.80%, propanol accounting for 4.8% in Chongqing relaxation source chemical industry) to a crude butanol storage tank, buffering, pumping to a raw material preheater, heating to 90 ℃, and entering a rough distillation tower;
2) the upper temperature of the crude distillation tower is 65-68 ℃, the lower temperature is 93.5-95 ℃, the pressure is 11.5KPa, the vapor phase discharged from the crude distillation tower is condensed by a first condenser, the condensate is discharged into a distillation tank of the crude distillation tower, the vapor phase discharged from the crude distillation tower is mainly methanol, the ratio is more than 93 percent, a part of the condensate in the distillation tank of the crude distillation tower reflows to the crude distillation tower through a first reflux pipe, and the reflux ratio is 1: 20, discharging the remaining condensate to a methanol finished product tank to obtain a methanol finished product;
3) feeding tower bottom materials (mainly comprising water, propanol and butanol) of a crude distillation tower into a first reboiler, wherein the first reboiler uses 1.0MPa steam as a heating medium, a vapor phase discharged from the first reboiler returns to the crude distillation tower and is used as a heat source of the crude distillation tower, discharged high-temperature liquid passes through a medium channel of a raw material preheater and is used as a heating medium of the raw material preheater, after heat exchange with a crude butanol raw material passing through the raw material preheater, the high-temperature liquid is cooled to 31.5 ℃ by a kettle liquid cooler, enters a standing and layering tank and is subjected to standing and layering, wherein the upper layer is an oil phase, the butanol accounts for 80%, and the lower layer is a water phase;
4) discharging the oil phase on the upper layer of the standing layering tank into a rectifying tower, discharging the water phase on the lower layer of the standing layering tank into a water phase tank, wherein the mass concentration of butanol in the water phase is 7.7%, feeding the water phase into a wastewater rectifying tower, condensing a vapor phase (mainly butanol, the content is more than 98%) discharged from an exhaust port at the top of the tower by using 1.0MPa steam as a heat source, feeding the vapor phase into a distillation tank of the wastewater rectifying tower, and directly discharging the water COD (chemical oxygen demand) discharged from the bottom of the tower to a sewage treatment plant for treatment, wherein the COD is less than or equal to;
5) the upper temperature of the rectifying tower is 92-95 ℃, the lower temperature is 120-125 ℃, the pressure is 31-40KPa, a vapor phase (mainly butanol, accounting for 98%) discharged from the rectifying tower is condensed by a second condenser, condensate is discharged into a rectifying tower distillation groove, a part of the condensate in the rectifying tower distillation groove reflows to the rectifying tower through a second reflux pipe, and the reflux ratio is 1: 2;
6) feeding the tower bottom material of the rectifying tower into a second reboiler, using 1.0MPa steam as a heating medium in the second reboiler, returning the vapor phase discharged by the second reboiler to the rectifying tower, feeding the discharged high-temperature liquid into a reaction kettle, adding caustic soda flakes at the temperature of 118-135 ℃ in the reaction kettle until the purity is 99 percent and the pH value is 8-10, decoloring under the stirring condition, feeding the vapor phase discharged by the reaction kettle into a vacuum distillation tower, discontinuously discharging impurities generated in the reaction kettle, and feeding the impurities into a tar storage tank of a BDO tar purification device;
7) the temperature of the vacuum distillation tower is 116.8-117.5 ℃, the vapor phase discharged from the vacuum distillation tower is condensed by a third condenser, and the condensate is discharged into a finished product storage tank to obtain a finished butanol product with the purity of more than 98%.
Claims (4)
1. A crude butanol recovery system which characterized in that: comprises a crude butanol storage tank (1), a raw material preheater (2), a crude distillation tower (3), a first reboiler (4), a rectifying tower (5), a second reboiler (6), a standing and layering tank (7), a first condenser (8), a second condenser (9), a methanol finished product tank (10), a finished product storage tank (11), a reaction kettle (12), a vacuum distillation tower (13) and a third condenser (14),
the crude butanol storage tank (1) is connected with the crude distillation tower (3) through a raw material preheater (2), a steam outlet at the top of the crude distillation tower (3) is connected with a crude distillation tower distillation tank (15) through a first condenser (8), the crude distillation tower distillation tank (15) is connected with the middle part of the side wall of the crude distillation tower (3) through a first return pipe (16), a return pump is arranged on the first return pipe (16), the crude distillation tower distillation tank (15) is connected with a methanol finished product tank (10) through a pipeline, the bottom of the crude distillation tower (3) is connected with a feed inlet of a first reboiler (4), a discharge outlet of the first reboiler (4) is connected with a medium inlet of the raw material preheater (2), a medium outlet of the raw material preheater (2) is connected with a standing layering tank (7) through a kettle liquid cooler (17),
the bottom of the side wall of the standing and layering tank (7) is connected with a water phase tank (18), the top of the side wall of the standing and layering tank (7) is connected with an oil phase tank (19),
oil phase jar (19) are connected with rectifying column (5) through the pipeline, and the top of the tower steam vent of this rectifying column (5) passes through second condenser (9) and is connected with rectifying column rectification groove (20), and this rectifying column rectification groove (20) are connected with rectifying column (5) lateral wall middle part through second back flow (21), are equipped with the backwash pump on second back flow (21), and the bottom of the tower of rectifying column (5) is connected with the feed inlet of second reboiler (6), the discharge gate of second reboiler (6) with reation kettle (12) are connected, and the top steam vent of reation kettle (12) is connected with vacuum distillation tower (13), the top steam vent of vacuum distillation tower (13) is connected with finished product storage tank (11) through third condenser (14).
2. The crude butanol recovery system of claim 1, wherein: the water phase tank (18) is connected with a wastewater rectifying tower (22) through a pipeline, a steam outlet at the top of the wastewater rectifying tower (22) is connected with a wastewater rectifying tower distillation tank (24) through a fourth condenser (23), the wastewater rectifying tower distillation tank (24) is connected with the middle part of the side wall of the wastewater rectifying tower (22) through a third return pipe (25), a reflux pump is arranged on the third return pipe (25), and the wastewater rectifying tower distillation tank (24) is connected with a crude butanol storage tank (1).
3. The crude butanol recovery system of claim 2, wherein: the first condenser (8), the second condenser (9), the third condenser (14) and the fourth condenser (23) are all formed by connecting two tube-plate heat exchangers with the same specification in series.
4. The crude butanol recovery system of claim 1, wherein: the rectifying tower distillation groove (20) is connected with the crude butanol storage tank (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921805042.7U CN211199067U (en) | 2019-10-24 | 2019-10-24 | Crude butanol recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921805042.7U CN211199067U (en) | 2019-10-24 | 2019-10-24 | Crude butanol recovery system |
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| Publication Number | Publication Date |
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| CN211199067U true CN211199067U (en) | 2020-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921805042.7U Active CN211199067U (en) | 2019-10-24 | 2019-10-24 | Crude butanol recovery system |
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| CN (1) | CN211199067U (en) |
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- 2019-10-24 CN CN201921805042.7U patent/CN211199067U/en active Active
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