CN211445567U - Energy-conserving toluene-ethanol waste liquid recovery refining plant - Google Patents
Energy-conserving toluene-ethanol waste liquid recovery refining plant Download PDFInfo
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- CN211445567U CN211445567U CN201922412040.8U CN201922412040U CN211445567U CN 211445567 U CN211445567 U CN 211445567U CN 201922412040 U CN201922412040 U CN 201922412040U CN 211445567 U CN211445567 U CN 211445567U
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Abstract
The utility model provides a toluene-ethanol waste liquid high value is synthesized and is retrieved refining plant, pass through each pipeline respectively including the raw materials of three kinds of differences, through retrieving refining plant and separating out high-purity toluene, ethanol solution. The utility model has the advantages that: for the existing composition of toluene and ethanol waste liquid, the high-value recovery and refining of 80 percent toluene waste liquid and 80 percent ethanol waste liquid are carried out, the products with the toluene mass content of 99.8 percent and the ethanol mass content of 97 percent are refined, the field equipment is fully utilized, and the additional investment of the equipment is reduced.
Description
Technical Field
The utility model belongs to the technical field of the waste liquid recovery refining system, concretely relates to energy-conserving toluene-ethanol waste liquid recovery refining plant.
Background
Toluene and ethanol belong to important organic solvents and are widely applied to the fields of chemical industry, pharmacy, dyes and the like. However, because of the lowest boiling point of the toluene-ethanol system, the conventional distillation separation device cannot effectively separate the system. The extraction and rectification, the salt-added extraction and rectification and the like have the problems of difficult entrainer selection, difficult recovery and purification, large energy consumption and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing a toluene-ethanol waste liquid high-value comprehensive recovery refining device. The toluene and ethanol separated by the device have high purity and good recovery effect.
The purpose of the utility model is realized with the following mode: an energy-saving toluene-ethanol waste liquid recovery refining device comprises a four-way valve, wherein three inlets of the four-way valve are respectively connected with a raw material warehouse A2, a raw material warehouse A3 and an oil-water separator, an outlet of the four-way valve is connected with a toluene recovery tower through a pipeline m, the bottom end of the oil-water separator is connected with a toluene cache tank through a parallel pipeline a, a pipeline b is connected with an ethanol cache tank, the toluene cache tank is connected with a toluene rectifying tower through a pipeline c, a pipeline j is connected with a first-stage ethanol phase separator, a pipeline k is connected with a second-stage ethanol phase separator, the top of the toluene rectifying tower is connected with the ethanol cache tank through a pipeline d, a tower kettle product is collected to a toluene finished product tank, the ethanol cache tank is connected with a raw material warehouse A1, the bottom end of the toluene cache tank is connected with an ethanol lightness removing tower through a pipeline e, the top of the ethanol lightness removing tower is connected, the switching valve is connected with a raw material warehouse A2 and an ethanol secondary phase separator, the ethanol secondary phase separator is connected with a toluene recovery tower through a pipeline h, a toluene recovery tower kettle is connected with an ethanol lightness-removing tower through a pipeline i, a product at the top of the ethanol lightness-removing tower is collected to an ethanol crude product tank, and a product at the tower kettle is collected to an ethanol waste liquid tank.
The energy-saving toluene-ethanol waste liquid recovery and refining device comprises 80wt% of ethanol waste liquid as a raw material in a raw material library A1, 100 wt% of deionized water as a raw material in a raw material library A2, and 80wt% of toluene waste liquid as a raw material in a raw material library A3.
The utility model has the advantages that: for the existing composition of toluene and ethanol waste liquid, the high-value recovery and refining of 80 percent toluene waste liquid and 80 percent ethanol waste liquid are carried out, the products with the toluene mass content of 99.8 percent and the ethanol mass content of 97 percent are refined, the field equipment is fully utilized, and the additional investment of the equipment is reduced.
Drawings
FIG. 1 is a flow chart of the toluene-ethanol waste liquid recovery and refining device of the utility model.
Detailed description of the invention
The invention is described in further detail below with reference to the following figures and detailed description:
as shown in fig. 1, the utility model discloses a toluene-ethanol waste liquid recovery refining plant, including four-way valve 10 (export of three import), four-way valve 10's three import is connected with former feed reservoir A2, former feed reservoir A3, oil water separator 1 respectively, and its export is passed through pipeline m and is connected toluene recovery tower 8. The bottom end of the oil-water separator 1 is connected with a pipeline a in parallel to be connected with a toluene cache tank 2, and a pipeline b is connected with an ethanol cache tank 4. The toluene cache tank 2 is connected with a toluene rectifying tower 3 through a pipeline c, a pipeline j is connected with a first-stage phase separator 6 of ethanol, and a pipeline k is connected with a second-stage phase separator 7 of ethanol. The top of the toluene rectifying tower 3 is connected with an ethanol cache tank 4 through a pipeline d, and a product in the tower kettle is collected to a toluene finished product tank. The ethanol buffer tank is connected with a raw material warehouse A1, and the bottom end of the ethanol buffer tank is connected with the ethanol lightness-removing tower 5 through a pipeline e. The top of the ethanol lightness-removing tower 5 is connected with an ethanol first-stage phase separator 6 through a pipeline f, and a product at the bottom of the tower is collected to an ethanol crude product tank. The bottom end of the first-stage ethanol phase separator 6 is connected with a switch valve 11 through a pipeline g. The switching valve 11 is connected with a raw material storage B2 and an ethanol secondary phase separator 7. The ethanol secondary phase separator 7 is connected with a toluene recovery tower 8 through a pipeline h. The bottom of the toluene recovery tower 8 is connected with an ethanol lightness-removing tower 9 through a pipeline i. And collecting the product at the top of the ethanol light component removal tower 9 to an ethanol crude product tank, and collecting the product at the bottom of the tower to an ethanol waste liquid tank. Wherein the raw material library A1 is 80wt% ethanol waste liquid, the raw material library A2 is 100 wt% deionized water, and the raw material library A3 is 80wt% toluene waste liquid.
The recovery, refining and separation method of the recovery and refining device for the toluene-ethanol waste liquid comprises the following steps:
(1) oil-water separation process
Introducing 200kg of toluene waste liquid into the oil-water separator 1, adding 10kg of deionized water, and stirring for 10-30 minutes;
standing for 20 minutes, discharging the water phase containing ethanol at the bottom through a pipeline b, and collecting the water phase into an ethanol cache tank 4;
173kg of an oily phase containing 93% by weight of toluene are passed via line a into toluene buffer tank 2 for further processing.
(2) Toluene purification
Introducing 173kg of oil phase collected in the oil-water separation process and 47kg of toluene solution recovered by an ethanol recovery unit into a 3-tower kettle of a toluene refining tower;
respectively starting a condenser at the top of the toluene rectifying tower 3 and a reboiler at the bottom of the tower, and gradually heating the interior of the tower;
when the liquid level of the tower top reflux tank reaches 50%, starting a reflux pump to carry out total reflux;
and (3) continuously heating the tower kettle of the toluene rectifying tower 3, observing the temperature at the top of the tower to 78 ℃, and starting to extract, wherein the product is toluene front fraction containing ethanol and is collected to an ethanol cache tank 4 through a pipeline d.
The reflux ratio was gradually decreased to 3.0 to continuously withdraw light components.
Observing the temperature change at the top of the tower, and switching to a toluene finished product tank when the temperature at the top of the tower reaches 110 ℃;
observing the temperature of the tower kettle and the flow change of the tower top extraction, stopping heating when the liquid level of the tower kettle is low or the temperature of the tower top is reduced for a short time, and putting all the components of the tower top reflux tank into a finished product tank. And collecting and analyzing the residual liquid in the tower bottom uniformly, and then treating.
(3) Ethanol recovery and refining
Introducing 80wt% ethanol-toluene mixed solution into a tower bottom 5 of an ethanol lightness-removing tower, wherein the introduction amount is 200 kg;
simultaneously, 47kg of water phase separated from oil and water in the toluene recovery process and 20kg of front fraction extracted from toluene refining are introduced into the kettle 5 of the ethanol lightness-removing column through a pipeline e;
respectively starting a condenser at the top of the ethanol lightness-removing tower 5 and a reboiler at the bottom of the tower, and gradually heating the interior of the tower;
when the liquid level of the tower top reflux tank reaches 50%, starting a reflux pump to carry out total reflux;
and continuously heating the tower kettle, observing the temperature at the top of the tower to 74 ℃, starting to extract 120kg of light components containing toluene, and collecting the light components to the first-stage ethanol phase separator 6 through a pipeline f.
The reflux ratio was gradually decreased to 3.0, and light components were continuously withdrawn.
Observing the temperature change of the tower kettle, stopping the extraction at the tower top and carrying out total reflux when the temperature of the tower kettle rises to 79 ℃;
stopping heating the tower, transferring 148kg of crude ethanol product with the weight percent of 96 at the bottom of the tower to an ethanol crude product tank;
(4) oil-water separation
120kg of front fraction extracted from the ethanol lightness-removing tower 5 is primarily separated in an ethanol first-stage phase separator 6;
after fully standing and layering, collecting 94kg of water phase containing ethanol at the bottom;
then 26kg of oil phase containing 93wt% of toluene is extracted, and the oil phase is collected uniformly and then enters a toluene refining unit for toluene recovery and refining;
the separated water phase is introduced into the ethanol secondary phase separator 7 again, and 10kg of deionized water is supplemented;
fully stirring, standing for layering, and then carrying out phase splitting operation;
93kg of water phase is extracted to a toluene recovery tower 8, and 22kg of oil phase is extracted to a toluene cache tank 2 in the toluene refining process;
(5) toluene recovery & ethanol heaviness removal
93kg of water phase after the secondary oil-water separation still contains 8wt% of toluene and needs to be further recycled;
uniformly introducing the water phase into a tower kettle of a toluene recovery tower 8, respectively starting a condenser at the top of the toluene recovery tower 8 and a reboiler at the tower kettle, and gradually heating the interior of the tower;
when the liquid level of the tower top reflux tank reaches 50%, starting a reflux pump to carry out total reflux;
and continuously heating the tower kettle, observing the temperature at the top of the tower to 68 ℃, starting to extract a product which is 10kg of light components containing toluene, and collecting the product to a toluene waste liquid tank.
The reflux ratio was gradually decreased to 3.0, and light components were continuously withdrawn.
Observing the temperature change of the tower top, when the temperature of the tower top rises to 79 ℃, collecting 60kg/h of 94wt% ethanol crude product from the tower top, and uniformly collecting the ethanol crude product to an ethanol crude product tank;
when the temperature at the top of the tower continues to rise or the temperature at the top of the tower drops for a short time, stopping the extraction at the top of the tower and switching to total reflux;
stopping heating the tower, wherein the tower kettle is 23kg of 1-2 wt% ethanol water solution, and taking out the ethanol water solution to an ethanol waste liquid tank;
(6) refining of crude ethanol
The 94wt% ethanol crude product is obtained by separation by using ternary azeotropic method.
For the production and utilization of small batches, the method can be used for treating by a quicklime method, and comprises the following steps: 2/3 crude ethanol solution is introduced into the kettle, excessive crushed quicklime is added, the mixture is stirred, heated and refluxed for 1 hour, and then the ethanol with the purity of 99.5wt% is obtained by distillation.
In summary, the present invention is not limited to the above embodiments, and other embodiments can be easily proposed by those skilled in the art within the technical teaching of the present invention, but all such embodiments are included in the scope of the present invention.
Claims (2)
1. The utility model provides an energy-conserving toluene-ethanol waste liquid recovery refining plant, includes the four-way valve, its characterized in that: three inlets of the four-way valve are respectively connected with a raw material warehouse A2, a raw material warehouse A3 and an oil-water separator, the outlet of the four-way valve is connected with a toluene recovery tower through a pipeline m, the bottom end of the oil-water separator is connected with a pipeline a in parallel and connected with a toluene cache tank, a pipeline b is connected with an ethanol cache tank, the toluene cache tank is connected with a toluene rectifying tower through a pipeline c, a pipeline j is connected with a first-stage ethanol phase separator, a pipeline k is connected with a second-stage ethanol phase separator, the top of the toluene rectifying tower is connected with the ethanol cache tank through a pipeline d, a tower kettle product is collected to a toluene finished product tank, the ethanol cache tank is connected with a raw material warehouse A1, the bottom end of the ethanol lightness-removing tower is connected with an ethanol lightness-removing tower through a pipeline e, the top of the ethanol lightness-removing tower is connected with a first-stage ethanol phase separator through a pipeline f, the tower kettle product is, the ethanol secondary phase separator is connected with a toluene recovery tower through a pipeline h, a tower kettle of the toluene recovery tower is connected with an ethanol lightness-removing tower through a pipeline i, a product at the top of the ethanol lightness-removing tower is collected to an ethanol crude product tank, and a product at the tower kettle is collected to an ethanol waste liquid tank.
2. The energy-saving toluene-ethanol waste liquid recycling and refining apparatus as claimed in claim 1, wherein the raw material in the raw material warehouse A1 is 80wt% ethanol waste liquid, the raw material in the raw material warehouse A2 is 100 wt% deionized water, and the raw material in the raw material warehouse A3 is 80wt% toluene waste liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922412040.8U CN211445567U (en) | 2019-12-28 | 2019-12-28 | Energy-conserving toluene-ethanol waste liquid recovery refining plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922412040.8U CN211445567U (en) | 2019-12-28 | 2019-12-28 | Energy-conserving toluene-ethanol waste liquid recovery refining plant |
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| CN211445567U true CN211445567U (en) | 2020-09-08 |
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| CN201922412040.8U Active CN211445567U (en) | 2019-12-28 | 2019-12-28 | Energy-conserving toluene-ethanol waste liquid recovery refining plant |
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