Energy-saving and consumption-reducing diethyl carbonate preparation device

Abstract

The utility model relates to an energy-saving and consumption-reducing diethyl carbonate preparation device. According to the technical scheme, the top of a first diethyl carbonate rectifying tower is connected with a first diethyl carbonate upper condenser and a diethyl carbonate lower condenser, and the raw material dimethyl carbonate is connected to a shell pass inlet of the first diethyl carbonate upper condenser; after being heated by the first diethyl carbonate upper condenser, the first diethyl carbonate upper condenser is connected to a side line feeding hole of the dimethyl carbonate rectifying tower through a pipeline; the top of the second diethyl carbonate rectifying tower is connected with a second diethyl carbonate upper condenser and a second diethyl carbonate lower condenser; and the raw material absolute ethyl alcohol is heated by the second diethyl carbonate upper condenser and then is connected to a side line feeding hole of the absolute ethyl alcohol rectifying tower through a pipeline. The system has the beneficial effects that the raw material as a refrigerant enters the raw material pretreatment tower after being subjected to gas phase heat exchange with the tower top, and the raw material as a refrigerant enters the raw material pretreatment tower after being subjected to gas phase heat exchange with the tower top, so that heat energy in the system is fully utilized, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to a device for preparing diethyl carbonate, in particular to an energy-saving and consumption-reducing device for preparing diethyl carbonate. Background Art

[0002] With the development of new energy vehicles and energy storage batteries, the rapid development of the lithium-ion battery industry has been driven. Among them, diethyl carbonate mainly plays the role of an electrolyte in lithium-ion batteries. It can form a complex with lithium salts to prepare an electrolyte solution, increasing the ionic conductivity of the electrolyte solution of lithium-ion batteries, thereby improving the performance of lithium-ion batteries; in addition, diethyl carbonate can also protect the electrode material, reduce the reaction between the electrode and the electrolyte solution, and extend the service life of lithium-ion batteries. At present, in the preparation process of diethyl carbonate (DEC), steam is generally used for preheating and heating, which has high energy consumption and high production cost, and the heat energy is not recycled. In particular, a large amount of heat energy is wasted during the reflux process of the gas phase at the top of the rectifying tower and the separation tower. Summary of the Utility Model

[0003] The purpose of the utility model is to provide an energy-saving and consumption-reducing device for preparing diethyl carbonate aiming at the above-mentioned defects existing in the prior art. After the raw material is used as a refrigerant to exchange heat with the gas phase at the top of the tower and then enters the raw material pretreatment tower. After the raw material is used as a refrigerant to exchange heat with the gas phase at the top of the tower and then enters the raw material pretreatment tower, the heat energy in the system is fully utilized to reduce the production cost.

[0004] An energy-saving and consumption-reducing preparation device for diethyl carbonate mentioned in the utility model, its technical solution is: including a reaction tower (T101), a separation tower (T102), a methyl ethyl carbonate rectification tower (T103), a dimethyl carbonate rectification tower (T104), an absolute ethanol rectification tower (T105), a first diethyl carbonate rectification tower (T106), a second diethyl carbonate rectification tower (T107), a reactor (1), a preheater (2). The top of the dimethyl carbonate rectification tower (T104) and the top of the absolute ethanol rectification tower (T105) are connected to the tube-side inlet of the preheater (2) through pipelines. The tube-side outlet of the preheater (2) is connected to the upper part of the reactor (1) through a pipeline. The lower part of the reactor (1) is connected to the reaction tower (T101). The bottom of the reaction tower (T101) is connected to the side line of the separation tower (T102) through a pipeline. The upper side of the separation tower (T102) is connected to the methyl ethyl carbonate rectification tower (T103) through a pipeline. The bottom of the separation tower (T102) is connected to the shell-side inlet of the preheater (2) through a pipeline. The shell-side outlet of the preheater (2) is connected to the diethyl carbonate rectification tower (T106) through a pipeline. It is characterized in that: it also includes a fourth condenser (6), a fifth condenser (7), a first upper diethyl carbonate condenser (8), a lower diethyl carbonate condenser (9), a second upper diethyl carbonate condenser (10), a second lower diethyl carbonate condenser (11).

[0005] The top of the first diethyl carbonate rectification tower (T106) is connected to the first upper diethyl carbonate condenser (8) and the lower diethyl carbonate condenser (9). The raw material dimethyl carbonate is connected to the shell-side inlet of the first upper diethyl carbonate condenser (8), and after being heated by the first upper diethyl carbonate condenser (8), it is then connected to the side-line feed port of the dimethyl carbonate rectification tower (T104) through a pipeline. The top of the second diethyl carbonate rectification tower (T107) is connected to the second upper diethyl carbonate condenser (10) and the second lower diethyl carbonate condenser (11). The raw material absolute ethanol is connected to the shell-side inlet of the second upper diethyl carbonate condenser (10), and after being heated by the second upper diethyl carbonate condenser (10), it is then connected to the side-line feed port of the absolute ethanol rectification tower (T105) through a pipeline.

[0006] Preferably, the top of the above-mentioned dimethyl carbonate rectification tower (T104) is connected to the tube-side inlet of the fourth condenser (6) through a pipeline. The tube-side outlet of the fourth condenser (6) is connected to the preheater (2) through a dimethyl carbonate buffer tank (c1) and a circulation pump. The top of the absolute ethanol rectification tower (T105) is connected to the tube-side inlet of the fifth condenser (7) through a pipeline. The tube-side outlet of the fifth condenser (7) is connected to the preheater (2) through an absolute ethanol buffer tank (c2) and a circulation pump.

[0007] Preferably, a reboiler (a3) is provided at the lower part of the above-mentioned reaction tower (T101), a reboiler (a4) is provided at the lower part of the separation tower (T102), a reboiler (a5) of the methyl ethyl carbonate distillation column (T103) is provided at the lower part of the methyl ethyl carbonate distillation column (T103), a reboiler (a6) of the first diethyl carbonate distillation column (T106) is provided at the lower part of the first diethyl carbonate distillation column (T106), and a reboiler (a7) of the second diethyl carbonate distillation column is provided at the lower part of the methyl ethyl carbonate distillation column (T103).

[0008] Preferably, a reboiler (a1) of the above-mentioned dimethyl carbonate distillation column (T104) is provided at the lower part of the dimethyl carbonate distillation column (T104), and an absolute ethanol reboiler (a2) is provided at the lower part of the absolute ethanol distillation column (T105).

[0009] Preferably, the steam return water of the above-mentioned reaction tower reboiler (a3), separation tower reboiler (a4), methyl ethyl carbonate distillation column reboiler (a5), first diethyl carbonate distillation column reboiler (a6), and second diethyl carbonate distillation column reboiler (a7) is connected to the tube side inlet of the dimethyl carbonate distillation column reboiler (a1) through a pipeline to provide a heat source for the dimethyl carbonate distillation column reboiler (a1) to preheat the dimethyl carbonate. The tube side outlet of the dimethyl carbonate distillation column reboiler (a1) is connected to the tube side inlet of the absolute ethanol reboiler (a2) through a pipeline to provide a heat source for the absolute ethanol reboiler (a2) to preheat the absolute ethanol.

[0010] Preferably, the tube side outlet of the lower condenser (9) of the above-mentioned diethyl carbonate is connected to the diethyl carbonate buffer tank (c7) through a pipeline. The lower end of the diethyl carbonate buffer tank (c7) is connected to the upper side of the diethyl carbonate distillation column (T106) through a pipeline. The shell side outlet of the second lower condenser (11) of the diethyl carbonate is connected to the diethyl carbonate storage tank (c8) through a pipeline.

[0011] Preferably, the top of the above-mentioned reaction tower (T101) is connected to the tube side inlet of the first condenser (3) through a pipeline. The tube side outlet of the first condenser (3) is connected to the reaction tower buffer tank (c3) through a pipeline. The lower end of the reaction tower buffer tank (c3) is connected to the upper side of the reaction tower (T101) through a circulation pump and a pipeline.

[0012] Preferably, the top of the above-mentioned separation tower (T102) is connected to the tube side inlet of the second condenser (4) through a pipeline. The tube side outlet of the second condenser (4) is connected to the separation tower buffer tank (c4) through a pipeline. The separation tower buffer tank (c4) is connected to the upper side of the separation tower (T102) through a circulation pump and a pipeline.

[0013] Preferably, the top of the above-mentioned methyl ethyl carbonate rectification column (T103) is connected to the inlet of the tube side of the third condenser (5) through a pipeline. The outlet of the tube side of the third condenser (5) is connected to the rectification column buffer tank (c5) through a pipeline. The rectification column buffer tank (c5) is connected to the upper side of the methyl ethyl carbonate rectification column (T103) through a circulating pump and a pipeline. The side line of the methyl ethyl carbonate rectification column (T103) is connected to the methyl ethyl carbonate buffer tank (c6) through a pipeline.

[0014] The beneficial effects of the present utility model are as follows: The heat of the preheater of the present utility model comes from the withdrawn liquid at the bottom of the separation column, realizing the recycling of heat and reducing energy consumption. The steam return water of the reaction column reboiler, the separation column reboiler, the methyl ethyl carbonate rectification column reboiler, the first diethyl carbonate rectification column reboiler, and the second diethyl carbonate rectification column reboiler is connected to the inlet of the tube side of the dimethyl carbonate rectification column reboiler through a pipeline to provide heat source for the dimethyl carbonate rectification column reboiler to preheat dimethyl carbonate. The outlet of the tube side of the dimethyl carbonate rectification column reboiler is connected to the inlet of the tube side of the absolute ethanol reboiler through a pipeline to provide heat source for the absolute ethanol reboiler to preheat absolute ethanol, thereby greatly reducing the consumption of steam and reducing energy consumption. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of the first embodiment of the present utility model;

[0016] Figure 2 is a schematic structural diagram of the second embodiment of the present utility model;

[0017] In the above figure: reaction column T101, separation column T102, methyl ethyl carbonate rectification column T103, dimethyl carbonate rectification column T104, absolute ethanol rectification column T105, first diethyl carbonate rectification column T106, second diethyl carbonate rectification column T107, reactor 1, preheater 2, first condenser 3, second condenser 4, third condenser 5, fourth condenser 6, fifth condenser 7, first diethyl carbonate upper condenser 8, diethyl carbonate lower condenser 9, second diethyl carbonate upper condenser 10, second diethyl carbonate lower condenser 11, dimethyl carbonate buffer tank c1, absolute ethanol buffer tank c2, reaction column buffer tank c3, separation column buffer tank c4, rectification column buffer tank c5, methyl ethyl carbonate buffer tank c6, diethyl carbonate buffer tank c7, diethyl carbonate storage tank c8, dimethyl carbonate rectification column reboiler a1, absolute ethanol reboiler a2, reaction column reboiler a3, separation column reboiler a4, methyl ethyl carbonate rectification column reboiler a5, first diethyl carbonate rectification column reboiler a6, second diethyl carbonate rectification column reboiler a7. Detailed Embodiments

[0018] The preferred embodiments of the present utility model will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present utility model, and are not used to limit the present utility model.

[0019] Example 1. Referring to Figure 1 , an energy-saving and consumption-reducing preparation device for diethyl carbonate mentioned in the present utility model includes a reaction tower T101, a separation tower T102, a methyl ethyl carbonate rectification tower T103, a dimethyl carbonate rectification tower T104, an absolute ethanol rectification tower T105, a first diethyl carbonate rectification tower T106, a second diethyl carbonate rectification tower T107, a reactor 1, and a preheater 2. The top of the dimethyl carbonate rectification tower T104 and the top of the absolute ethanol rectification tower T105 are connected to the tube-side inlet of the preheater 2 through pipelines. The tube-side outlet of the preheater 2 is connected to the upper part of the reactor 1 through a pipeline. The lower part of the reactor 1 is connected to the reaction tower T101. The bottom of the reaction tower T101 is connected to the side line of the separation tower T102 through a pipeline. The upper side of the separation tower T102 is connected to the methyl ethyl carbonate rectification tower T103 through a pipeline. The bottom of the separation tower T102 is connected to the shell-side inlet of the preheater 2 through a pipeline. The shell-side outlet of the preheater 2 is connected to the diethyl carbonate rectification tower T106 through a pipeline. Among them, it also includes a fourth condenser 6, a fifth condenser 7, a first diethyl carbonate upper condenser 8, a diethyl carbonate lower condenser 9, a second diethyl carbonate upper condenser 10, and a second diethyl carbonate lower condenser 11.

[0020] The top of the first diethyl carbonate rectification tower T106 is connected to the first diethyl carbonate upper condenser 8 and the diethyl carbonate lower condenser 9. The raw material dimethyl carbonate is connected to the shell-side inlet of the first diethyl carbonate upper condenser 8, and after being heated by the first diethyl carbonate upper condenser 8, it is connected to the side-line feed inlet of the dimethyl carbonate rectification tower T104 through a pipeline. The top of the second diethyl carbonate rectification tower T107 is connected to the second diethyl carbonate upper condenser 10 and the second diethyl carbonate lower condenser 11. The raw material absolute ethanol is connected to the shell-side inlet of the second diethyl carbonate upper condenser 10, and after being heated by the second diethyl carbonate upper condenser 10, it is connected to the side-line feed inlet of the absolute ethanol rectification tower T105 through a pipeline.

[0021] Among them, a reaction tower reboiler a3 is provided at the lower part of the reaction tower T101, a separation tower reboiler a4 is provided at the lower part of the separation tower T102, a methyl ethyl carbonate rectification tower reboiler a5 is provided at the lower part of the methyl ethyl carbonate rectification tower T103, a first diethyl carbonate rectification tower reboiler a6 is provided at the lower part of the first diethyl carbonate rectification tower T106, and a second diethyl carbonate rectification tower reboiler a7 is provided at the lower part of the methyl ethyl carbonate rectification tower T103.

[0022] The lower part of the above-mentioned dimethyl carbonate distillation column T104 is provided with a dimethyl carbonate reboiler a1, and the lower part of the absolute ethanol distillation column T105 is provided with an absolute ethanol reboiler a2.

[0023] The steam return water of the above-mentioned reaction column reboiler a3, separation column reboiler a4, ethyl methyl carbonate distillation column reboiler a5, first diethyl carbonate distillation column reboiler a6, and second diethyl carbonate distillation column reboiler a7 is connected to the tube side inlet of the dimethyl carbonate reboiler a1 through a pipeline to provide heat source for the dimethyl carbonate reboiler a1 to preheat dimethyl carbonate. The tube side outlet of the dimethyl carbonate reboiler a1 is connected to the tube side inlet of the absolute ethanol reboiler a2 through a pipeline to provide heat source for the absolute ethanol reboiler a2 to preheat absolute ethanol.

[0024] The tube side outlet of the above-mentioned lower condenser 9 of diethyl carbonate is connected to the diethyl carbonate buffer tank c7 through a pipeline. The lower end of the diethyl carbonate buffer tank c7 is connected to the upper side of the diethyl carbonate distillation column T106 through a pipeline. The shell side outlet of the above-mentioned second lower condenser 11 of diethyl carbonate is connected to the diethyl carbonate storage tank c8 through a pipeline.

[0025] The top of the above-mentioned reaction column T101 is connected to the tube side inlet of the first condenser 3 through a pipeline. The tube side outlet of the first condenser 3 is connected to the reaction column buffer tank c3 through a pipeline. The lower end of the reaction column buffer tank c3 is connected to the upper side of the reaction column T101 through a circulating pump and a pipeline.

[0026] The top of the above-mentioned separation column T102 is connected to the tube side inlet of the second condenser 4 through a pipeline. The tube side outlet of the second condenser 4 is connected to the separation column buffer tank c4 through a pipeline. The separation column buffer tank c4 is connected to the upper side of the separation column T102 through a circulating pump and a pipeline.

[0027] The top of the above-mentioned ethyl methyl carbonate distillation column T103 is connected to the tube side inlet of the third condenser 5 through a pipeline. The tube side outlet of the third condenser 5 is connected to the distillation column buffer tank c5 through a pipeline. The distillation column buffer tank c5 is connected to the upper side of the ethyl methyl carbonate distillation column T103 through a circulating pump and a pipeline. The side line of the ethyl methyl carbonate distillation column T103 is connected to the ethyl methyl carbonate buffer tank c6 through a pipeline.

[0028] When the utility model is in use, the raw material dimethyl carbonate (DMC) is preheated by the first diethyl carbonate upper condenser 8 and then fed into the side line of the dimethyl carbonate distillation column T104 for rectification to remove impurities first. The raw material absolute ethanol (ET) is preheated by the second diethyl carbonate upper condenser 10 and then fed into the side line of the absolute ethanol distillation column T105 for rectification to remove impurities. Then, it is preheated by the preheater 2, and after the preheating is completed, it enters the reactor 1 for reaction to generate ethyl methyl carbonate, diethyl carbonate, and methanol. The mixture enters the reaction column T101 for continuous reaction. The top of the reaction column T101 extracts the azeotrope of dimethyl ester and methanol, and the bottom of the column extracts the mixture of ethyl methyl carbonate and diethyl carbonate and enters the separation column T102. The top of the separation column T102 extracts ethyl methyl carbonate and sends it to the ethyl methyl carbonate distillation column T103. The liquid extracted from the bottom of the separation column T102 is fed into the diethyl carbonate distillation column T106 for rectification to obtain diethyl carbonate with higher purity;

[0029] Among them, the heat of the preheater 2 comes from the liquid extracted from the bottom of the separation column T102, realizing the recycling of heat and reducing energy consumption. The steam return water of the reaction column reboiler a3, the separation column reboiler a4, the ethyl methyl carbonate distillation column reboiler a5, the first diethyl carbonate distillation column reboiler a6, and the second diethyl carbonate distillation column reboiler a7 is connected to the tube side inlet of the dimethyl carbonate distillation column reboiler a1 through a pipeline to provide heat source for the dimethyl carbonate distillation column reboiler a1 to preheat dimethyl carbonate. The tube side outlet of the dimethyl carbonate distillation column reboiler a1 is connected to the tube side inlet of the absolute ethanol reboiler a2 through a pipeline to provide heat source for the absolute ethanol reboiler a2 to preheat absolute ethanol, thereby greatly reducing the consumption of steam and energy consumption.

[0030] Example 2. An energy-saving and consumption-reducing preparation device for diethyl carbonate mentioned in the present utility model includes a reaction tower T101, a separation tower T102, a methyl ethyl carbonate rectification tower T103, a dimethyl carbonate rectification tower T104, an absolute ethanol rectification tower T105, a first diethyl carbonate rectification tower T106, a second diethyl carbonate rectification tower T107, a reactor 1, and a preheater 2. The top of the dimethyl carbonate rectification tower T104 and the top of the absolute ethanol rectification tower T105 are connected to the tube-side inlet of the preheater 2 through pipelines. The tube-side outlet of the preheater 2 is connected to the upper part of the reactor 1 through a pipeline. The lower part of the reactor 1 is connected to the reaction tower T101. The bottom of the reaction tower T101 is connected to the side line of the separation tower T102 through a pipeline. The upper side of the separation tower T102 is connected to the methyl ethyl carbonate rectification tower T103 through a pipeline. The bottom of the separation tower T102 is connected to the shell-side inlet of the preheater 2 through a pipeline. The shell-side outlet of the preheater 2 is connected to the diethyl carbonate rectification tower T106 through a pipeline. Among them, it further includes a fourth condenser 6, a fifth condenser 7, a first upper diethyl carbonate condenser 8, a lower diethyl carbonate condenser 9, a second upper diethyl carbonate condenser 10, and a second lower diethyl carbonate condenser 11.

[0031] The top of the first diethyl carbonate rectification tower T106 is connected to the first upper diethyl carbonate condenser 8 and the lower diethyl carbonate condenser 9. The raw material dimethyl carbonate is connected to the shell-side inlet of the first upper diethyl carbonate condenser 8, and after being heated by the first upper diethyl carbonate condenser 8, it is then connected to the side-line feed port of the dimethyl carbonate rectification tower T104 through a pipeline. The top of the second diethyl carbonate rectification tower T107 is connected to the second upper diethyl carbonate condenser 10 and the second lower diethyl carbonate condenser 11. The raw material absolute ethanol is connected to the shell-side inlet of the second upper diethyl carbonate condenser 10, and after being heated by the second upper diethyl carbonate condenser 10, it is then connected to the side-line feed port of the absolute ethanol rectification tower T105 through a pipeline.

[0032] The difference from Example 1 is:

[0033] Referring to Figure 2 , the top of the dimethyl carbonate rectification tower T104 in this embodiment is connected to the tube-side inlet of the fourth condenser 6 through a pipeline. The tube-side outlet of the fourth condenser 6 is connected to the preheater 2 through a dimethyl carbonate buffer tank c1 and a circulation pump. The top of the absolute ethanol rectification tower T105 is connected to the tube-side inlet of the fifth condenser 7 through a pipeline. The tube-side outlet of the fifth condenser 7 is connected to the preheater 2 through an absolute ethanol buffer tank c2 and a circulation pump.

[0034] In addition, the lower end of the rectification tower buffer tank c5 is connected to the upper side of the methyl ethyl carbonate rectification tower T103 through a circulation pump and a pipeline, and another pipeline is connected to the inlet of the preheater 2, so that methyl ethyl carbonate can enter the reactor 1 again for reaction.

[0035] The above are only the preferred embodiments of the present utility model. Any person skilled in the art may modify the present utility model by using the technical solutions described above or modify it into equivalent technical solutions. Therefore, any simple modification or equivalent transformation made according to the technical solutions of the present utility model falls within the scope of protection required by the present utility model.

Claims

1. An energy-saving and consumption-reducing preparation device for diethyl carbonate, comprising a reaction tower (T101), a separation tower (T102), a methyl ethyl carbonate rectification tower (T103), a dimethyl carbonate rectification tower (T104), an absolute ethanol rectification tower (T105), a first diethyl carbonate rectification tower (T106), a second diethyl carbonate rectification tower (T107), a reactor (1), and a preheater (2). The top of the dimethyl carbonate rectification tower (T104) and the top of the absolute ethanol rectification tower (T105) are connected to the inlet of the tube side of the preheater (2) through pipelines. The outlet of the tube side of the preheater (2) is connected to the upper part of the reactor (1) through a pipeline. The lower part of the reactor (1) is connected to the reaction tower (T101). The bottom of the reaction tower (T101) is connected to the side line of the separation tower (T102) through a pipeline. The upper side of the separation tower (T102) is connected to the methyl ethyl carbonate rectification tower (T103) through a pipeline. The bottom of the separation tower (T102) is connected to the inlet of the shell side of the preheater (2) through a pipeline. The outlet of the shell side of the preheater (2) is connected to the diethyl carbonate rectification tower (T106) through a pipeline. It is characterized in that: It also includes a fourth condenser (6), a fifth condenser (7), a first upper diethyl carbonate condenser (8), a lower diethyl carbonate condenser (9), a second upper diethyl carbonate condenser (10), and a second lower diethyl carbonate condenser (11). The top of the first diethyl carbonate rectifying column (T106) is connected to the first upper diethyl carbonate condenser (8) and the lower diethyl carbonate condenser (9). The raw material dimethyl carbonate is connected to the shell-side inlet of the first upper diethyl carbonate condenser (8), and after being heated by the first upper diethyl carbonate condenser (8), it is then connected to the side-line feed port of the dimethyl carbonate rectifying column (T104) through a pipeline. The top of the second diethyl carbonate rectifying column (T107) is connected to the second upper diethyl carbonate condenser (10) and the second lower diethyl carbonate condenser (11). The raw material absolute ethanol is connected to the shell-side inlet of the second upper diethyl carbonate condenser (10), and after being heated by the second upper diethyl carbonate condenser (10), it is then connected to the side-line feed port of the absolute ethanol rectifying column (T105) through a pipeline.

2. The energy-saving and consumption-reducing preparation device for diethyl carbonate according to claim 1, characterized in that: The top of the dimethyl carbonate rectifying column (T104) is connected to the tube-side inlet of the fourth condenser (6) through a pipeline. The tube-side outlet of the fourth condenser (6) is connected to the preheater (2) through a dimethyl carbonate buffer tank (c1) and a circulation pump. The top of the absolute ethanol rectifying column (T105) is connected to the tube-side inlet of the fifth condenser (7) through a pipeline. The tube-side outlet of the fifth condenser (7) is connected to the preheater (2) through an absolute ethanol buffer tank (c2) and a circulation pump.

3. The energy-saving and consumption-reducing preparation device for diethyl carbonate according to claim 2, wherein: A reboiler (a3) is provided at the lower part of the reaction column (T101), a reboiler (a4) is provided at the lower part of the separation column (T102), a reboiler (a5) of the methyl ethyl carbonate rectifying column is provided at the lower part of the methyl ethyl carbonate rectifying column (T103), a reboiler (a6) of the first diethyl carbonate rectifying column is provided at the lower part of the first diethyl carbonate rectifying column (T106), and a reboiler (a7) of the second diethyl carbonate rectifying column is provided at the lower part of the methyl ethyl carbonate rectifying column (T103).

4. The energy-saving and consumption-reducing preparation device for diethyl carbonate according to claim 3, wherein: A reboiler (a1) of the dimethyl carbonate rectifying column is provided at the lower part of the dimethyl carbonate rectifying column (T104), and an absolute ethanol reboiler (a2) is provided at the lower part of the absolute ethanol rectifying column (T105).

5. The energy-saving and consumption-reducing preparation device for diethyl carbonate according to claim 4, characterized in that: The steam return water of the reaction column reboiler (a3), the separation column reboiler (a4), the reboiler (a5) of the methyl ethyl carbonate rectifying column, the reboiler (a6) of the first diethyl carbonate rectifying column, and the reboiler (a7) of the second diethyl carbonate rectifying column are connected to the tube-side inlet of the reboiler (a1) of the dimethyl carbonate rectifying column through pipelines to provide heat source for the reboiler (a1) of the dimethyl carbonate rectifying column to preheat dimethyl carbonate. The tube-side outlet of the reboiler (a1) of the dimethyl carbonate rectifying column is connected to the tube-side inlet of the absolute ethanol reboiler (a2) through a pipeline to provide heat source for the absolute ethanol reboiler (a2) to preheat absolute ethanol.

6. The energy-saving and consumption-reducing preparation device for diethyl carbonate according to claim 1, characterized in that: The tube side outlet of the lower diethyl carbonate condenser (9) is connected to the diethyl carbonate buffer tank (c7) through a pipeline. The lower end of the diethyl carbonate buffer tank (c7) is connected to the upper side of the diethyl carbonate distillation column (T106) through a pipeline. The shell side outlet of the second lower diethyl carbonate condenser (11) is connected to the diethyl carbonate storage tank (c8) through a pipeline.

7. An apparatus for preparing diethyl carbonate with energy conservation and consumption reduction according to claim 6, characterized in that: The top of the reaction tower (T101) is connected to the tube side inlet of the first condenser (3) through a pipeline. The tube side outlet of the first condenser (3) is connected to the reaction tower buffer tank (c3) through a pipeline. The lower end of the reaction tower buffer tank (c3) is connected to the upper side of the reaction tower (T101) through a circulating pump and a pipeline.

8. The energy-saving and consumption-reducing preparation device for diethyl carbonate according to claim 7, characterized in that: The top of the separation tower (T102) is connected to the tube side inlet of the second condenser (4) through a pipeline. The tube side outlet of the second condenser (4) is connected to the separation tower buffer tank (c4) through a pipeline. The separation tower buffer tank (c4) is connected to the upper side of the separation tower (T102) through a circulating pump and a pipeline.

9. The preparation device for diethyl carbonate with energy conservation and consumption reduction according to claim 7, characterized in that: The top of the methyl ethyl carbonate distillation column (T103) is connected to the tube side inlet of the third condenser (5) through a pipeline. The tube side outlet of the third condenser (5) is connected to the distillation column buffer tank (c5) through a pipeline. The distillation column buffer tank (c5) is connected to the upper side of the methyl ethyl carbonate distillation column (T103) through a circulating pump and a pipeline. The side line of the methyl ethyl carbonate distillation column (T103) is connected to the methyl ethyl carbonate buffer tank (c6) through a pipeline.

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