CN215517222U - Safety interlocking system for process for co-producing methyl ethyl carbonate and diethyl carbonate by dimethyl carbonate and ethanol - Google Patents
Safety interlocking system for process for co-producing methyl ethyl carbonate and diethyl carbonate by dimethyl carbonate and ethanol Download PDFInfo
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- CN215517222U CN215517222U CN202120782460.XU CN202120782460U CN215517222U CN 215517222 U CN215517222 U CN 215517222U CN 202120782460 U CN202120782460 U CN 202120782460U CN 215517222 U CN215517222 U CN 215517222U
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Abstract
The utility model discloses a safety interlock system for a process for co-producing methyl ethyl carbonate and diethyl carbonate by dimethyl carbonate and ethanol, belonging to the technical field of co-production of methyl ethyl carbonate and diethyl carbonate. The technical scheme is as follows: the feed inlet of the reaction rectifying tower for the process of coproducing methyl ethyl carbonate and diethyl carbonate from dimethyl carbonate and ethanol is respectively connected with the discharge outlet of a dimethyl carbonate buffer tank, the discharge outlet of an absolute ethyl alcohol storage tank and the discharge outlet of a sodium methoxide tank through pipelines, a dimethyl carbonate feed pump is arranged on the pipeline between the dimethyl carbonate buffer tank and the reaction rectifying tower, and a cut-off valve is arranged on the pipeline between the absolute ethyl alcohol storage tank and the reaction rectifying tower; the discharge hole at the bottom of the reaction rectifying tower is connected with the feed inlet of the filter material buffer tank through a pipeline, and a discharge pump of the reaction rectifying tower is arranged on the pipeline. The utility model realizes the safe interlocking arrangement of the reaction rectifying tower, the EMC product tower and the DEC product tower, so that the whole system is in a safe state.
Description
Technical Field
The utility model relates to the technical field of coproduction of methyl ethyl carbonate and diethyl carbonate, in particular to a safety interlock system for a process for coproducing methyl ethyl carbonate and diethyl carbonate from dimethyl carbonate and ethanol.
Background
In the process of co-producing ethyl methyl carbonate and diethyl carbonate by the reaction of dimethyl carbonate and ethanol by adopting an ester exchange method, the product is obtained by the processes of raw material refining, synthesis, crude product rectification, catalyst removal, EMC/DEC separation, EMC lightness removal, EMC refining, DEC refining and the like. But the hidden trouble that the production is stopped because the liquid level of the materials is too low or too high exists in the procedures of crude product rectification, EMC refining and DEC refining.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: the safety interlocking system for the process of co-producing methyl ethyl carbonate and diethyl carbonate by dimethyl carbonate and ethanol overcomes the defects of the prior art, adopts a Distributed Control System (DCS) to form an interlocking loop, realizes the safety interlocking setting of a reaction rectifying tower, an EMC product tower and a DEC product tower, and ensures that the whole system is in a safe state.
The technical scheme of the utility model is as follows:
the safety interlocking system is used for a process for co-producing methyl ethyl carbonate and diethyl carbonate by dimethyl carbonate and ethanol, a feed inlet of a reaction rectifying tower for the process of co-producing methyl ethyl carbonate and diethyl carbonate by dimethyl carbonate and ethanol is respectively connected with a discharge port of a dimethyl carbonate buffer tank, a discharge port of an absolute ethanol storage tank and a discharge port of a sodium methoxide tank through pipelines, a dimethyl carbonate feed pump is arranged on the pipeline between the dimethyl carbonate buffer tank and the reaction rectifying tower, and a stop valve is arranged on the pipeline between the absolute ethanol storage tank and the reaction rectifying tower; a discharge hole at the bottom of the reaction rectifying tower is connected with a feed inlet of a filter material buffer tank through a pipeline, and a discharge pump of the reaction rectifying tower is arranged on the pipeline; the reaction rectifying tower is provided with a first liquid level sensor, and the first liquid level sensor, the dimethyl carbonate feed pump, the cut-off valve and the reaction rectifying tower discharge pump are respectively and electrically connected with the control system.
Preferably, the system for co-producing methyl ethyl carbonate and diethyl carbonate by dimethyl carbonate and ethanol further comprises an EMC product tower, an EMC feed inlet of the EMC product tower is connected with a discharge outlet of a feed buffer tank of the EMC product tower through a pipeline, and an EMC product tower feed pump is arranged on the pipeline; a discharge hole at the bottom of the EMC product tower is connected with a coarse EMC material buffer tank through a pipeline, and an EMC product tower bottom pump is arranged on the pipeline; and the EMC product tower is provided with a second liquid level sensor, and the second liquid level sensor, the EMC product tower feeding pump and the EMC product tower bottom pump are respectively electrically connected with the control system.
Preferably, the system for co-producing methyl ethyl carbonate and diethyl carbonate by dimethyl carbonate and ethanol further comprises a DEC product tower, wherein a DEC feed inlet of the DEC product tower is connected with a discharge outlet of the DEC refining tower through a pipeline, and a DEC refining tower pump is arranged on the pipeline; a discharge port at the bottom of the DEC product tower is connected with a feed port of the filtrate tank through a pipeline, and a DEC product tower bottom pump is arranged on the pipeline; and a third liquid level sensor is installed on the DEC product tower, and the third liquid level sensor, the DEC refining tower pump and the DEC product tower bottom pump are respectively and electrically connected with the control system.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model adopts a distributed control system (DCS system) to form an interlocking loop, realizes the safe interlocking setting of the reaction rectifying tower, the EMC product tower and the DEC product tower, and ensures that the whole system is in a safe state.
Drawings
FIG. 1 is a schematic view of the structure of a reactive distillation column of the present invention.
FIG. 2 is a schematic diagram of the structure of the dimethyl carbonate feed pump of the present invention.
Fig. 3 is a schematic structural view of an EMC product tower of the present invention.
Fig. 4 is a schematic diagram of the structure of an EMC product tower feed pump of the present invention.
FIG. 5 is a schematic diagram of the structure of a DEC product column of the present invention.
FIG. 6 is a schematic diagram of the structure of a DEC refining column pump of the present invention.
In the figure, a 1-reaction rectifying tower, a 2-dimethyl carbonate feed pump, a 3-cut-off valve, a 4-reaction rectifying tower discharge pump, a 5-first liquid level sensor, a 6-EMC product tower, a 7-EMC product tower feed pump, an 8-EMC product tower bottom pump, a 9-second liquid level sensor, a 10-DEC product tower, a 11-DEC refining tower pump, a 12-DEC product tower bottom pump and a 13-third liquid level sensor.
Detailed Description
As shown in fig. 1-6, the present invention provides a safety interlock system for a process of co-producing methyl ethyl carbonate and diethyl carbonate with dimethyl carbonate and ethanol, wherein a feed inlet of a reaction rectifying tower 1 for the process of co-producing methyl ethyl carbonate and diethyl carbonate with dimethyl carbonate and ethanol is respectively connected with a discharge outlet of a dimethyl carbonate buffer tank, a discharge outlet of an absolute ethanol storage tank and a discharge outlet of a sodium methoxide tank through pipelines, a dimethyl carbonate feed pump 2 is arranged on the pipeline between the dimethyl carbonate buffer tank and the reaction rectifying tower 1, and a cut-off valve 3 is arranged on the pipeline between the absolute ethanol storage tank and the reaction rectifying tower 1; a discharge hole at the bottom of the reaction rectifying tower 1 is connected with a feed inlet of a filter material buffer tank through a pipeline, and a discharge pump 4 of the reaction rectifying tower is arranged on the pipeline; the reaction rectifying tower 1 is provided with a first liquid level sensor 5, and the first liquid level sensor 5, the dimethyl carbonate feed pump 2, the cut-off valve 3 and the reaction rectifying tower discharge pump 4 are respectively electrically connected with a control system.
An EMC feed inlet of the EMC product tower 6 for the process of co-producing methyl ethyl carbonate and diethyl carbonate with dimethyl carbonate and ethanol is connected with a discharge outlet of a feed buffer tank of the EMC product tower 6 through a pipeline, and an EMC product tower feed pump 7 is arranged on the pipeline; a discharge hole at the bottom of the EMC product tower 6 is communicated with a coarse EMC material buffer tank through a pipeline, and an EMC product tower bottom pump 8 is arranged on the pipeline; and the EMC product tower 6 is provided with a second liquid level sensor 9, and the second liquid level sensor 9, the EMC product tower feeding pump 7 and the EMC product tower bottom pump 8 are respectively electrically connected with the control system.
A DEC feed inlet of a DEC product tower 10 for the process of coproducing methyl ethyl carbonate and diethyl carbonate from dimethyl carbonate and ethanol is connected with a discharge outlet of a DEC refining tower through a pipeline, and a DEC refining tower pump 11 is arranged on the pipeline; a discharge port at the bottom of the DEC product tower 10 is connected with a feed port of a filtrate tank through a pipeline, and a DEC product tower bottom pump 12 is arranged on the pipeline; the DEC product tower 10 is provided with a third liquid level sensor 13, and the third liquid level sensor 13, the DEC refining tower pump 11 and the DEC product tower bottom pump 12 are respectively electrically connected with the control system.
The working principle is as follows:
the process for coproducing methyl ethyl carbonate and diethyl carbonate from dimethyl carbonate and ethanol comprises the following working procedures:
1) refining raw materials: the nitrogen is introduced into the device for replacement before driving so that the oxygen content in the device is lower than 0.5 percent. The industrial grade dimethyl carbonate comes from a tank field industrial grade dimethyl carbonate storage tank, impurities in raw materials are removed through a dimethyl carbonate (DMC) raw material refining tower, a side product is sent to a dimethyl carbonate buffer tank, and products at the top of the tower and a tower bottom are sent to the industrial grade dimethyl carbonate tank.
2) And (3) reaction rectification: since the reaction conversion rate is controlled by the reaction equilibrium, reaction rectification is required to achieve a higher conversion rate. In the reactive distillation tower 1, an azeotrope is formed by DMC and methanol, so that the separation of methanol, ethyl methyl carbonate and diethyl carbonate is realized. The upper section of the reactive distillation column 1 is a distillation section and is filled with CY filler; the lower section is a reaction section which is a tower plate. The raw materials are mixed and then enter the middle part of a reaction rectifying tower 1, and the dimethyl carbonate and ethanol are mixed with a catalyst sodium methoxide according to a certain mass ratio and then enter the reaction rectifying tower 1. In the reactive distillation column 1, the mixture of methanol and dimethyl carbonate is discharged from the top of the column, and ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, methanol, catalyst and incompletely converted ethanol are discharged from the bottom of the column. The temperature of the tower bottom is between 90 and 105 ℃. The azeotrope of methanol and dimethyl carbonate at the top of the tower is conveyed to a dimethyl carbonate separating device. And conveying the mixture of dimethyl carbonate, methyl ethyl carbonate, diethyl carbonate and sodium methoxide generated in the tower kettle to a filter material buffer tank, conveying the mixture to a plate-and-frame filter press through a pump, and filtering to remove the deactivated catalyst.
3) Removing the catalyst: in the presence of sodium methoxide, methyl ethyl carbonate is easily decomposed into dimethyl carbonate and diethyl carbonate, and sodium methoxide easily causes fouling of a reboiler in a column bottom. Because the solubility of sodium methoxide in carbonate materials is very low, sodium methoxide is easy to crystallize and separate out. And separating and removing the deactivated catalyst by adopting a plate-and-frame filter press.
4) Refining and separating crude ethyl methyl carbonate and diethyl carbonate: and (3) enabling the filtrate passing through the filter to enter a crude diethyl carbonate (DEC) refining tower, removing ethyl methyl carbonate, dimethyl carbonate, ethanol and trace methanol from the tower top, cooling the filtrate by a tower top condenser, enabling the cooled filtrate to enter a tower top reflux tank, enabling one part of the cooled filtrate to be used as the reflux of the crude diethyl carbonate (DEC) refining tower through a reflux pump, and conveying the other part of the cooled filtrate to the crude Ethyl Methyl Carbonate (EMC) refining tower. The tower bottom is mainly a crude product of diethyl carbonate and is conveyed to a subsequent industrial-grade diethyl carbonate refining tower through a material conveying pump.
The distillate from the top of a crude diethyl carbonate (DEC) refining tower enters a crude Ethyl Methyl Carbonate (EMC) refining tower, materials containing dimethyl carbonate, ethyl methyl carbonate, ethanol and a small amount of methanol are removed from the top of the tower and return to a reaction rectifying tower 1, and the material of the crude ethyl methyl carbonate is obtained at the bottom of the tower.
And (5) conveying the tower bottom material to an industrial grade Ethyl Methyl Carbonate (EMC) refining tower.
5) Refining industrial-grade ethyl methyl carbonate: the method comprises the following steps that materials from a tower kettle of a crude Ethyl Methyl Carbonate (EMC) refining tower enter an industrial grade Ethyl Methyl Carbonate (EMC) refining tower, light component materials extracted from the tower top enter a reflux tank after being condensed by a tower top condenser, a part of the light component materials is returned as reflux by a pump, a part of the light component materials is conveyed to a crude Ethyl Methyl Carbonate (EMC) material buffer tank and returned to an EMC crude product refining tower by conveying, heavy component materials extracted from a tower kettle pump are conveyed to a filtrate tank and returned to a crude diethyl carbonate (DEC) refining tower by conveying, industrial grade ethyl methyl carbonate materials with the side line extraction purity higher than 99.9% are conveyed to an EMC product tower 6 feeding buffer tank by a pump and conveyed to a battery grade Ethyl Methyl Carbonate (EMC) product refining tower by the pump for refining.
6) Refining industrial diethyl carbonate: the method comprises the following steps that materials from a tower kettle of a crude diethyl carbonate (DEC) refining tower enter an industrial grade diethyl carbonate (DEC) refining tower, light component materials extracted from the top of the tower enter a reflux tank after being condensed by a tower top condenser, one part of the light component materials is returned as reflux through a pump, the other part of the light component materials is extracted to a filtrate tank and returned from the filtrate tank, and DEC materials extracted from the tower kettle and containing heavy component impurities are conveyed to an industrial grade DEC product tank through a tower kettle pump. And (3) conveying the industrial grade diethyl carbonate material with the purity higher than 99.9 percent extracted from the side line to a battery grade diethyl carbonate product (DEC) rectifying tower for refining.
7) Refining a battery-grade ethyl methyl carbonate product: materials from the side line of an industrial grade Ethyl Methyl Carbonate (EMC) refining tower are conveyed to an EMC product tower 6 in a feeding buffer tank of the EMC product tower 6 through a pump. After intermittent rectification and purification, materials containing light component impurities are extracted from the top of the tower, condensed by a condenser at the top of the tower, sent to a reflux tank at the top of the tower, returned to an EMC product tower 6 as reflux by a reflux pump, and conveyed to a crude EMC material buffer tank by a part of the extracted materials, and the materials containing heavy component impurities extracted from the bottom of the tower are also conveyed to a crude EMC material buffer tank and returned to a crude Ethyl Methyl Carbonate (EMC) refining tower. And a battery-grade ethyl methyl carbonate product with the side extraction purity higher than 99.99 percent is extracted into a battery-grade EMC product intermediate tank through a side extraction pump, and is conveyed to a tank area EMC product tank through an EMC product pump after being qualified through inspection and analysis.
8) Refining a battery grade diethyl carbonate product: the industrial grade diethyl carbonate product from the industrial grade diethyl carbonate (DEC) refining column is transported via a feed pump to a DEC product column 10 for product refining. The material containing light component impurity extracted from the tower top is condensed by a tower top condenser and then is sent to a reflux tank, part of the material is returned to a DEC product tower 10 as reflux through a reflux pump, and the other part of the material is extracted to a filtrate tank, and the material containing heavy component impurity extracted from the tower bottom of the DEC product tower 10 is sent to the filtrate tank through a tower bottom pump. The battery grade diethyl carbonate product with the side draw purity higher than 99.99 percent is conveyed to a DEC product tank in the tank area by a side draw pump.
9) DMC pressure refining tower: the azeotropic material of DMC and methanol from the top of the reactive rectifying tower 1 is delivered to a DMC pressurizing refining tower through a top discharge pump, the operating pressure of the tower is controlled to be about 5 kilograms, the vapor-phase material at the top of the tower enters a reflux tank after being condensed by a top condenser, one part of the vapor-phase material is returned as reflux through a top reflux pump, one part of the vapor-phase material is extracted and delivered to the methanol normal-pressure refining tower, and the DMC material extracted from the bottom of the tower is directly discharged to an industrial grade DMC product tank.
10) Methanol normal pressure refining tower: the material from the top of the DMC pressure refining tower enters a methanol normal pressure refining tower, the normal pressure azeotrope of DMC and methanol distilled from the top of the tower is condensed by a tower top condenser and then enters a reflux tank, and the condensed product is pressurized by a reflux pump and then returns to the methanol normal pressure refining tower as reflux. The methanol material extracted from the tower kettle is pumped to a methanol storage tank in the tank area by a tower kettle pump.
The reaction equation is as follows:
the method comprises the steps that a first liquid level sensor 5 is arranged on a reaction rectifying tower 1, when the liquid level of a tower kettle is higher than the upper limit, interlocking is triggered, a Distributed Control System (DCS) controls to close a stop valve 3 on a pipeline of an absolute ethyl alcohol storage tank in an interlocking mode, absolute ethyl alcohol feeding is stopped, a dimethyl carbonate feeding pump 2 is controlled to close in a parallel lock mode, and dimethyl carbonate feeding is stopped; when the liquid level of the tower kettle is lower than the lower limit, the interlocking is triggered, and the Distributed Control System (DCS) controls to close the discharge pump 4 of the reaction rectifying tower in an interlocking manner, so that the discharge of the tower kettle is stopped.
According to the utility model, a second liquid level sensor 9 is arranged on an EMC product tower 6, when the liquid level of a tower kettle is higher than the upper limit, interlocking is triggered, a Distributed Control System (DCS) controls to close an EMC product tower feed pump 7 in an interlocking manner, and EMC feeding is stopped; when the liquid level of the tower kettle is lower than the lower limit, the interlocking is triggered, the Distributed Control System (DCS) controls to close the EMC product tower bottom pump 8 in an interlocking mode, and the discharging of the tower kettle is stopped.
According to the utility model, a third liquid level sensor 13 is arranged on a DEC product tower 10, when the liquid level of a tower kettle is higher than the upper limit, interlocking is triggered, a Distributed Control System (DCS) controls to close a DEC refining tower pump 11 in an interlocking manner, and DEC feeding is stopped; when the liquid level of the tower kettle is lower than the lower limit, the interlocking is triggered, a Distributed Control System (DCS) controls to close the DEC product tower bottom pump 12 in an interlocking mode, and the discharging of the tower kettle is stopped.
The utility model adopts a distributed control system (DCS system) to form an interlocking loop, realizes the safety interlocking arrangement of the reaction rectifying tower 1, the EMC product tower 6 and the DEC product tower 10, and ensures that the whole system is in a safe state.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. A safety interlock system that is used for methyl carbonate and ethanol coproduction ethyl methyl carbonate and diethyl carbonate technology, its characterized in that: a feed inlet of a reaction rectifying tower (1) for a process of coproducing methyl ethyl carbonate and diethyl carbonate from dimethyl carbonate and ethanol is respectively connected with a discharge outlet of a dimethyl carbonate buffer tank, a discharge outlet of an absolute ethyl alcohol storage tank and a discharge outlet of a sodium methoxide tank through pipelines, a dimethyl carbonate feed pump (2) is arranged on the pipeline between the dimethyl carbonate buffer tank and the reaction rectifying tower (1), and a cut-off valve (3) is arranged on the pipeline between the absolute ethyl alcohol storage tank and the reaction rectifying tower (1); a discharge hole at the bottom of the reaction rectifying tower (1) is connected with a feed inlet of a filter material buffer tank through a pipeline, and a discharge pump (4) of the reaction rectifying tower is arranged on the pipeline; a first liquid level sensor (5) is installed on the reaction rectifying tower (1), and the first liquid level sensor (5), the dimethyl carbonate feed pump (2), the stop valve (3) and the reaction rectifying tower discharge pump (4) are respectively electrically connected with a control system.
2. The safety interlock system for a process for the co-production of methyl ethyl carbonate and diethyl carbonate of dimethyl carbonate and ethanol as set forth in claim 1, wherein: an EMC feed inlet of an EMC product tower (6) for the process of coproducing methyl ethyl carbonate and diethyl carbonate from dimethyl carbonate and ethanol is connected with a discharge outlet of a feed buffer tank of the EMC product tower (6) through a pipeline, and an EMC product tower feed pump (7) is arranged on the pipeline; a discharge hole at the bottom of the EMC product tower (6) is communicated with a coarse EMC material buffer tank through a pipeline, and an EMC product tower bottom pump (8) is arranged on the pipeline; and a second liquid level sensor (9) is installed on the EMC product tower (6), and the second liquid level sensor (9), the EMC product tower feeding pump (7) and the EMC product tower bottom pump (8) are respectively electrically connected with the control system.
3. The safety interlock system for a process for the co-production of methyl ethyl carbonate and diethyl carbonate of dimethyl carbonate and ethanol as set forth in claim 1, wherein: a DEC feed inlet of a DEC product tower (10) for the process of coproducing methyl ethyl carbonate and diethyl carbonate from dimethyl carbonate and ethanol is connected with a discharge outlet of a DEC refining tower through a pipeline, and a DEC refining tower pump (11) is arranged on the pipeline; a discharge hole at the bottom of the DEC product tower (10) is connected with a feed inlet of a filtrate tank through a pipeline, and a DEC product tower bottom pump (12) is arranged on the pipeline; and a third liquid level sensor (13) is installed on the DEC product tower (10), and the third liquid level sensor (13), the DEC refining tower pump (11) and the DEC product tower bottom pump (12) are respectively electrically connected with the control system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120782460.XU CN215517222U (en) | 2021-04-16 | 2021-04-16 | Safety interlocking system for process for co-producing methyl ethyl carbonate and diethyl carbonate by dimethyl carbonate and ethanol |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120782460.XU CN215517222U (en) | 2021-04-16 | 2021-04-16 | Safety interlocking system for process for co-producing methyl ethyl carbonate and diethyl carbonate by dimethyl carbonate and ethanol |
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| CN215517222U true CN215517222U (en) | 2022-01-14 |
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| CN202120782460.XU Active CN215517222U (en) | 2021-04-16 | 2021-04-16 | Safety interlocking system for process for co-producing methyl ethyl carbonate and diethyl carbonate by dimethyl carbonate and ethanol |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114534291A (en) * | 2022-04-20 | 2022-05-27 | 山东海科新源材料科技股份有限公司 | Device and method for producing ethyl methyl carbonate by coupling reaction and rectification of solid catalyst |
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2021
- 2021-04-16 CN CN202120782460.XU patent/CN215517222U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114534291A (en) * | 2022-04-20 | 2022-05-27 | 山东海科新源材料科技股份有限公司 | Device and method for producing ethyl methyl carbonate by coupling reaction and rectification of solid catalyst |
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