NMP (N-Methyl Pyrrolidone) rectifying still residue concentration reduction equipment

Abstract

The utility model relates to the technical field of NMP (N-Methyl Pyrrolidone) recovery, in particular to NMP rectifying still residue concentration and reduction equipment which comprises a recovery tower, the bottom end of the recovery tower is connected with a first incinerator through a stripping tower, the right side of the first incinerator is connected with a waste heat boiler, the recovery tower is connected with the waste heat boiler through a second incinerator, and the second incinerator is connected with a third incinerator. The right side of the waste heat boiler is connected with the desulfurization and denitrification tower, the stripping tower is a plate tower or a packed tower, the first incinerator is a horizontal incinerator, the inner wall of the first incinerator is connected with an electromagnetic nozzle, and the electromagnetic nozzle is connected with an air inlet pipe. Pollutants can be greatly reduced by performing steam stripping on the amine concentrated solution through the steam stripping tower, performing incineration treatment on gaseous amine and tail gas and performing incineration treatment on the amine concentrated solution and rectifying still residues, and pollution to the environment can be effectively reduced by performing waste heat recovery and desulfurization and denitrification treatment on high-temperature flue gas subsequently, so that the system is green and environment-friendly.

Description

Technical Field

[0001] The utility model relates to the technical field of NMP recovery, in particular to a device for reducing the residual concentration of an NMP distillation kettle. Background Art

[0002] N-methylpyrrolidone (NMP for short) is a colorless, highly polar, chemically stable and thermally stable liquid. At the same time, it has the characteristics of low vapor pressure and good solubility, and can be used as an organic solvent and extractant. At present, N-methylpyrrolidone can be divided into ordinary grade, industrial grade and electronic grade according to different product indicators. Among them, electronic grade N-methylpyrrolidone is widely used in high-end industries such as semiconductors and lithium batteries, and can be used as a semiconductor circuit board cleaning agent and lithium battery electrolyte solvent. N-methylpyrrolidone used in high-end industries has strict index requirements for purity, moisture, metal ions, organic amines, etc. For example, in the lithium-ion battery industry, the moisture in N-methylpyrrolidone will react with the solvent in the electrolyte and thus affect the activity or life of the lithium battery. The metal impurity ions with a lower reduction potential than lithium ions will greatly reduce the reversible capacity of the lithium battery. At present, domestic electronic-grade products mainly rely on imports, and there are technical barriers in the purification process of electronic-grade NMP. Most domestic purification processes cannot meet the needs of high-end industries.

[0003] In the prior art, the still residue after distillation of N-methylpyrrolidone includes waste materials such as tail gas, amine concentrate, and distillation still residue. Conventional equipment cannot completely treat the still residue of N-methylpyrrolidone, which will cause environmental pollution. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide an NMP distillation kettle residue concentration and reduction device to solve the above-mentioned problem.

[0005] The utility model solves the above technical problems through a technical solution: an NMP distillation kettle residue concentration and reduction device, comprising a recovery tower, the bottom end of the recovery tower is connected to a first incinerator through a stripping tower, a waste heat boiler is connected to the right side of the first incinerator, the recovery tower is connected to the waste heat boiler through a second incinerator, and the right side of the waste heat boiler is connected to a desulfurization and denitrification tower.

[0006] As a preferred technical solution of the utility model, the stripping tower is a plate tower or a packed tower.

[0007] As a preferred technical solution of the utility model, the top temperature of the stripping tower is 35-45°C, the bottom temperature is 160-170°C, and the pressure in the tower is 14-16KPa.

[0008] As a preferred technical solution of the utility model, the flow rate of the residual liquid in the stripping tower is 4000-5000 L / h.

[0009] As a preferred technical solution of the utility model, the first incinerator is a horizontal incinerator, and the combustion temperature of the horizontal incinerator is 1000-1080°C.

[0010] As a preferred technical solution of the utility model, the flow rate ratio of high-pressure and low-pressure steam in the waste heat boiler is 1: (1-1.5).

[0011] As a preferred technical solution of the utility model, the exhaust temperature of the waste heat boiler is 160-170°C.

[0012] As a preferred technical solution of the utility model, an electromagnetic nozzle is connected to the inner wall of the first incinerator, and the electromagnetic nozzle is connected to the air inlet pipe.

[0013] Since the utility model adopts such a structure, the stripping of amine concentrate, the incineration of gaseous amine and tail gas, and the incineration of amine concentrate and distillation kettle residue can greatly reduce pollutants, and the subsequent waste heat recovery of high-temperature flue gas, desulfurization and denitrification treatment can effectively reduce pollution to the environment, which is green and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model discloses a flow chart of a NMP distillation kettle residual concentration and reduction device.

[0015] In the figure: 1 is a recovery tower, 2 is a stripping tower, 3 is a first incinerator, 4 is a second incinerator, 5 is a waste heat boiler, and 6 is a desulfurization and denitrification tower. DETAILED DESCRIPTION

[0016] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] like Figure 1As shown, an NMP distillation kettle residue concentration and reduction device of the utility model comprises a recovery tower 1, the bottom end of the recovery tower 1 is connected to a first incinerator 3 through a stripping tower 2, a waste heat boiler 5 is connected to the right side of the first incinerator 3, the recovery tower 1 is connected to the waste heat boiler 5 through a second incinerator 4, and the right side of the waste heat boiler 5 is connected to a desulfurization and denitrification tower 6. The NMP after distillation is recovered in the recovery tower 1, and tail gas, amine concentrate and distillation still residue are generated; the amine concentrate is transported to the stripping tower 2 for stripping to generate gaseous amine, and the gaseous amine is mixed with the tail gas and introduced into the first incinerator 3 for incineration treatment to generate high-temperature flue gas; the amine concentrate and the distillation still residue are introduced into the second incinerator 4 for incineration treatment to generate high-temperature flue gas; the high-temperature flue gas in the first incinerator 3 and the high-temperature flue gas in the second incinerator 4 are introduced into the waste heat boiler 5 together, and the waste heat boiler 5 generates water vapor and recovers the incineration heat energy; the exhaust gas of the waste heat boiler 5 is introduced into the desulfurization and denitration tower 6 for desulfurization and denitration treatment, which effectively reduces the pollution to the environment and is green and environmentally friendly.

[0018] In the utility model, the stripping tower 2 is a plate tower or a packed tower, the top temperature of the stripping tower is 35-45° C., the bottom temperature is 160-170° C., and the pressure in the tower is 14-16 KPa.

[0019] The utility model further provides that the flow rate of the residual liquid in the stripping tower is 4000-5000 L / h.

[0020] Furthermore, in the present invention, the first incinerator 3 is a horizontal incinerator, and the combustion temperature of the horizontal incinerator is 1000-1080°C.

[0021] In the utility model, the flow rate ratio of high-pressure and low-pressure steam in the waste heat boiler 5 is 1: (1-1.5).

[0022] Furthermore, in the present invention, the exhaust gas temperature of the waste heat boiler 5 is 160-170°C.

[0023] The utility model further has an electromagnetic nozzle connected to the inner wall of the first incinerator 3, and the electromagnetic nozzle is connected to the air intake pipe. The opening and closing of the electromagnetic nozzle is controlled according to the incineration progress, which can improve the incineration efficiency of gaseous amine and tail gas, and has good practicality.

[0024] The description and application of the utility model here are illustrative and are not intended to limit the scope of the utility model to the above-described embodiments. Variations and changes of the embodiments disclosed here are possible, and the actual replacement of the embodiments and the various components equivalent to those of ordinary skill in the art are well known. It should be clear to those skilled in the art that the utility model can be implemented in other forms, structures, arrangements, proportions, and with other elements, materials, and components without departing from the spirit or essential features of the utility model. Other variations and changes can be made to the embodiments disclosed here without departing from the spirit or essential features of the utility model.

Claims

1. A NMP distillation kettle residual concentration and reduction device, characterized in that: The invention comprises a recovery tower (1), wherein the bottom end of the recovery tower (1) is connected to a first incinerator (3) via a stripping tower (2), a waste heat boiler (5) is connected to the right side of the first incinerator (3), the recovery tower (1) is connected to the waste heat boiler (5) via a second incinerator (4), and the right side of the waste heat boiler (5) is connected to a desulfurization and denitration tower (6).

2. A NMP distillation still residual concentration and reduction equipment according to claim 1, characterized in that: The stripping tower (2) is a plate tower or a packed tower.

3. A NMP distillation still residual concentration and reduction equipment according to claim 2, characterized in that: The top temperature of the stripping tower is 35-45°C, the bottom temperature is 160-170°C, and the pressure inside the tower is 14-16KPa.

4. A NMP distillation still residual concentration and reduction equipment according to claim 2, characterized in that: The flow rate of the residual liquid in the stripping tower is 4000-5000 L / h.

5. A NMP distillation still residual concentration and reduction equipment according to claim 1, characterized in that: The first incinerator (3) is a horizontal incinerator, and the combustion temperature of the horizontal incinerator is 1000-1080°C.

6. A NMP distillation still residual concentration and reduction equipment according to claim 1, characterized in that: The flow rate ratio of high-pressure steam to low-pressure steam in the waste heat boiler (5) is 1:(1-1.5).

7. A NMP distillation still residual concentration and reduction equipment according to claim 6, characterized in that: The exhaust gas temperature of the waste heat boiler (5) is 160-170°C.

8. A NMP distillation kettle residual concentration and reduction equipment according to claim 1, characterized in that: An electromagnetic nozzle is connected to the inner wall of the first incinerator (3), and the electromagnetic nozzle is connected to the air intake pipe.

Images