NMP continuous energy-saving green production method and intelligent system thereof

Abstract

The invention relates to the technical field of NMP production, in particular to a continuous energy-saving green production method of NMP and an intelligent system.The continuous energy-saving green production method of NMP comprises the steps that GBL and methylamine are stored in independent storage boxes respectively, and a mixture is obtained; conveying the mixture into an NMP synthesis reactor, and heating the reactor by adopting conduction oil to obtain a high-temperature NMP reactant; placing the high-temperature NMP reactant in a first cooling tower, and cooling the NMP reactant by virtue of the first cooling tower, so as to obtain an NMP crude product; moving the NMP crude product into a rectifying tower, and carrying out finish machining to obtain a high-temperature NMP refined product; and the high-temperature NMP fine product is put into the second cooling tower, so that sewage in production can be collected, filtered and recycled, the sewage is prevented from being directly discharged to pollute the environment, and the effects of protecting the environment, being green and saving energy are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of NMP production, and in particular to a continuous energy-saving green production method of NMP and an intelligent system thereof. Background Art

[0002] The chemical name of NMP is N-methylpyrrolidone. NMP is a high-boiling point, environmentally friendly and excellent solvent with low viscosity, good chemical and thermal stability, high polarity, low volatility, and infinite miscibility with water and many organic solvents. The market application areas of N-methylpyrrolidone are mainly concentrated in lithium batteries, circuit boards, insulation materials, petrochemicals, medicines, pesticides, cleaning, high-resolution and other industries.

[0003] In the prior art, the BDO synthesis route is mainly used to synthesize γ-butyrolactone, which is then mixed with methylamine, and then the mixture is put into an NMP synthesis reactor for reaction to generate NMP, which is then subjected to subsequent finishing treatment to obtain finished NMP.

[0004] However, in the above-mentioned prior art, NMP generates sewage during the production process, and the sewage cannot be filtered. Therefore, the production of NMP cannot be green and environmentally friendly and is prone to pollute the environment. Summary of the invention

[0005] The purpose of the present invention is to provide a continuous energy-saving green production method of NMP and an intelligent system thereof, so as to solve the problem that in the prior art, sewage is generated during the production process of NMP and the sewage cannot be filtered, so the production of NMP cannot be green and environmentally friendly and is easy to pollute the environment.

[0006] To achieve the above object, the present invention provides a continuous energy-saving green production method of NMP, wherein GBL and methylamine are stored in separate storage boxes, respectively, and the flow rates are controlled by adjusting valves, and flow into a mixer in a preset ratio to obtain a mixture;

[0007] The mixture is transported to an NMP synthesis reactor, and the reactor is heated by heat transfer oil to obtain a high-temperature NMP reactant;

[0008] Placing the high-temperature NMP reactant in a first cooling tower, cooling the NMP reactant by the first cooling tower to obtain a crude NMP product;

[0009] The crude NMP product is moved to the distillation tower for fine processing to obtain high-temperature NMP fine products;

[0010] Place the high-temperature NMP product into the second cooling tower for cooling;

[0011] At the same time, the sewage in the NMP synthesis reactor and the distillation tower is discharged through the sewage pipe and stored in the sewage tank;

[0012] The sewage is transported to the deamination tower in turn through the conveying pipeline for deamination operation, and then transported through the activated carbon filter plate to filter out impurities in the sewage and reduce the odor of the sewage. Finally, it is discharged after sedimentation in the sedimentation tank to obtain purified water.

[0013] The purified water is transported to the methylamine storage tank through a pipeline and adjusted by a valve to adjust the concentration of methylamine and reuse the purified water.

[0014] Wherein, in the step of storing GBL and methylamine in separate storage boxes, respectively, controlling the flow rate by adjusting valves, and flowing them into a mixer in a preset ratio to obtain a mixture:

[0015] The stirring speed was 300 rpm and the stirring time was 1 hour.

[0016] Wherein, in the step of transporting the mixture to an NMP synthesis reactor, heating the reactor with heat transfer oil to obtain a high-temperature NMP reactant:

[0017] The outlet temperature is controlled at 260-275℃.

[0018] Among them, in the step of moving the crude NMP product into a distillation tower for fine processing to obtain high-temperature NMP fine products:

[0019] The outlet temperature is 270-300℃.

[0020] Among them, in the step of placing the high-temperature NMP fine product into the second cooling tower for cooling:

[0021] Energy is supplied by electrically connecting the distillation tower, the first cooling tower, the second cooling tower, the NMP synthesis reactor and the stirrer through connecting lines.

[0022] The present invention also provides an intelligent system for continuous energy-saving green production of NMP, which applies the above-mentioned continuous energy-saving green production method of NMP, including humidity monitoring equipment, temperature monitoring equipment, concentration monitoring equipment, metering equipment and a control server, wherein the humidity monitoring equipment, the temperature monitoring equipment, the concentration monitoring equipment and the metering equipment are all connected to the control server.

[0023] The present invention provides a continuous energy-saving green production method of NMP and an intelligent system thereof, wherein GBL and methylamine are stored in separate storage boxes respectively, and flow rates are controlled by adjusting valves to flow into a mixer according to a preset ratio to obtain a mixture; the mixture is transported to an NMP synthesis reactor, and the reactor is heated by heat transfer oil to obtain a high-temperature NMP reactant; the high-temperature NMP reactant is placed in a first cooling tower, and the NMP reactant is cooled by the first cooling tower to obtain a crude NMP product; the crude NMP product is moved to a distillation tower for fine processing to obtain a high-temperature fine NMP product; the high-temperature fine NMP product is placed in a second cooling tower for cooling ; At the same time, the sewage in the NMP synthesis reactor and the distillation tower is discharged through the sewage pipe and stored in the sewage tank; the sewage is transported to the deamination tower in turn through the conveying pipeline for deamination operation, and then transported through the activated carbon filter plate to filter out impurities in the sewage and reduce the odor of the sewage. Finally, it is discharged after precipitation in the sedimentation tank to obtain purified water; the purified water is transported to the methylamine storage tank through the pipeline, and at the same time, it is adjusted through the valve to adjust the concentration of methylamine and reuse the purified water. In this way, the sewage in the production can be collected, filtered and reused, avoiding direct discharge of sewage to pollute the environment, thereby achieving the effect of protecting the environment and green energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0025] Figure 1 is a flowchart of the steps of the first embodiment of the present invention.

[0026] Figure 2 is a flow chart of the steps of the second embodiment of the present invention.

[0027] Figure 3 is a flowchart of the steps of the third embodiment of the present invention.

[0028] Figure 4 It is a structural schematic diagram of the continuous energy-saving and green production method of NMP of the present invention.

[0029] Figure 5 It is a structural schematic diagram of the intelligent system for continuous energy-saving green production of NMP of the present invention. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0031] First embodiment:

[0032] See also Figure 1 and Figure 4 The present invention provides a continuous energy-saving and green production method of NMP, comprising the following steps:

[0033] S1: GBL and methylamine are stored in separate storage boxes, and the flow rates are controlled by adjusting valves to flow into a mixer in a preset ratio to obtain a mixture. The mixer speed is 300 rpm and the mixing time is 1 hour;

[0034] S2: The mixture is transported to an NMP synthesis reactor, which is heated by heat transfer oil to obtain a high-temperature NMP reactant, and the outlet temperature is controlled at 260°C;

[0035] S3: placing the high-temperature NMP reactant in a first cooling tower, cooling the NMP reactant by the first cooling tower to obtain a crude NMP product;

[0036] S4: The crude NMP is moved to a distillation tower for fine processing to obtain high-temperature NMP fine products with an outlet temperature of 270°C;

[0037] S5: placing the high-temperature NMP product into the second cooling tower for cooling;

[0038] S6: At the same time, the sewage in the NMP synthesis reactor and the distillation tower is discharged through the sewage pipe and stored in the sewage tank;

[0039] S7: The sewage is transported to the deamination tower in turn through the conveying pipeline for deamination operation, and then transported through the activated carbon filter plate to filter out impurities in the sewage and reduce the odor of the sewage. Finally, it is discharged after sedimentation in the sedimentation tank to obtain purified water;

[0040] S8: The purified water is transported to a methylamine storage tank through a pipeline and adjusted through a valve so that the concentration of methylamine can be adjusted and the purified water can be reused.

[0041] When using a continuous energy-saving green production method of NMP of the present embodiment, GBL and methylamine are stored in separate storage boxes respectively, and the flow rate is controlled by adjusting the valve to flow into the mixer according to a preset ratio to obtain a mixture, the mixer speed is 300 rpm, and the stirring time is 1 hour; the mixture is transported to the NMP synthesis reactor, the reactor is heated by heat transfer oil to obtain a high-temperature NMP reactant, and the outlet temperature is controlled at 260°C; the high-temperature NMP reactant is placed in a first cooling tower, and the NMP reactant is cooled by the first cooling tower to obtain a crude NMP product; the crude NMP product is moved to a distillation tower for fine processing to obtain a high-temperature NMP fine product, and the outlet temperature is 270°C; the high-temperature N The MP fine product is placed in the second cooling tower for cooling; it is electrically connected to the distillation tower, the first cooling tower, the second cooling tower, the NMP synthesis reactor and the stirrer through connecting lines to supply energy, and at the same time, the sewage in the NMP synthesis reactor and the distillation tower is discharged through the sewage pipe and stored in the sewage tank; the sewage is transported to the deamination tower in sequence through the conveying pipeline for deamination operation, and then transported through the activated carbon filter plate to filter impurities in the sewage and reduce the odor of the sewage, and finally discharged after precipitation in the sedimentation tank to obtain purified water; the purified water is transported to the methylamine storage tank through the pipeline, and at the same time, it is adjusted through the valve, so that the concentration of methylamine can be adjusted and the purified water can be reused.

[0042] Second embodiment:

[0043] See also Figure 2 and Figure 4 The present invention provides a continuous energy-saving and green production method of NMP, comprising the following steps:

[0044] S1: GBL and methylamine are stored in separate storage boxes, and the flow rates are controlled by adjusting valves to flow into a mixer in a preset ratio to obtain a mixture. The mixer speed is 300 rpm and the mixing time is 1 hour;

[0045] S2: The mixture is transported to an NMP synthesis reactor, which is heated by heat transfer oil to obtain a high-temperature NMP reactant, and the outlet temperature is controlled at 275°C;

[0046] S3: placing the high-temperature NMP reactant in a first cooling tower, cooling the NMP reactant by the first cooling tower to obtain a crude NMP product;

[0047] S4: The crude NMP is moved to a distillation tower for fine processing to obtain high-temperature NMP fine products with an outlet temperature of 300°C;

[0048] S5: placing the high-temperature NMP product into the second cooling tower for cooling;

[0049] S6: At the same time, the sewage in the NMP synthesis reactor and the distillation tower is discharged through the sewage pipe and stored in the sewage tank;

[0050] S7: The sewage is transported to the deamination tower in turn through the conveying pipeline for deamination operation, and then transported through the activated carbon filter plate to filter out impurities in the sewage and reduce the odor of the sewage. Finally, it is discharged after sedimentation in the sedimentation tank to obtain purified water;

[0051] S8: The purified water is transported to a methylamine storage tank through a pipeline and adjusted through a valve so that the concentration of methylamine can be adjusted and the purified water can be reused.

[0052] When using a continuous energy-saving green production method of NMP of the present embodiment, GBL and methylamine are stored in separate storage boxes respectively, and the flow rate is controlled by adjusting the valve to flow into the mixer according to a preset ratio to obtain a mixture, the mixer speed is 300 rpm, and the stirring time is 1 hour; the mixture is transported to the NMP synthesis reactor, the reactor is heated by heat transfer oil to obtain a high-temperature NMP reactant, and the outlet temperature is controlled at 275°C; the high-temperature NMP reactant is placed in a first cooling tower, and the NMP reactant is cooled by the first cooling tower to obtain a crude NMP product; the crude NMP product is moved to a distillation tower for fine processing to obtain a high-temperature NMP fine product, and the outlet temperature is 300°C; the high-temperature N The MP fine product is placed in the second cooling tower for cooling; it is electrically connected to the distillation tower, the first cooling tower, the second cooling tower, the NMP synthesis reactor and the stirrer through connecting lines to supply energy, and at the same time, the sewage in the NMP synthesis reactor and the distillation tower is discharged through the sewage pipe and stored in the sewage tank; the sewage is transported to the deamination tower in sequence through the conveying pipeline for deamination operation, and then transported through the activated carbon filter plate to filter impurities in the sewage and reduce the odor of the sewage, and finally discharged after precipitation in the sedimentation tank to obtain purified water; the purified water is transported to the methylamine storage tank through the pipeline, and at the same time, it is adjusted through the valve, so that the concentration of methylamine can be adjusted and the purified water can be reused.

[0053] Third embodiment:

[0054] See also Figure 3 and Figure 4 The present invention provides a continuous energy-saving and green production method of NMP, comprising the following steps:

[0055] S1: GBL and methylamine are stored in separate storage boxes, and the flow rates are controlled by adjusting valves to flow into a mixer in a preset ratio to obtain a mixture. The mixer speed is 300 rpm and the mixing time is 1 hour;

[0056] S2: The mixture is transported to an NMP synthesis reactor, which is heated by heat transfer oil to obtain a high-temperature NMP reactant, and the outlet temperature is controlled at 270°C;

[0057] S3: placing the high-temperature NMP reactant in a first cooling tower, cooling the NMP reactant by the first cooling tower to obtain a crude NMP product;

[0058] S4: The crude NMP is moved to a distillation tower for fine processing to obtain high-temperature NMP fine products with an outlet temperature of 285°C;

[0059] S5: placing the high-temperature NMP product into the second cooling tower for cooling;

[0060] S6: At the same time, the sewage in the NMP synthesis reactor and the distillation tower is discharged through the sewage pipe and stored in the sewage tank;

[0061] S7: The sewage is transported to the deamination tower in turn through the conveying pipeline for deamination operation, and then transported through the activated carbon filter plate to filter out impurities in the sewage and reduce the odor of the sewage. Finally, it is discharged after sedimentation in the sedimentation tank to obtain purified water;

[0062] S8: The purified water is transported to a methylamine storage tank through a pipeline and adjusted through a valve so that the concentration of methylamine can be adjusted and the purified water can be reused.

[0063] When using a continuous energy-saving green production method for NMP of the present embodiment, when using a continuous energy-saving green production method for NMP of the present embodiment, GBL and methylamine are stored in separate storage boxes respectively, and the flow rate is controlled by adjusting the valve to flow into the mixer according to a preset ratio to obtain a mixture, the mixer speed is 300 rpm, and the stirring time is 1 hour; the mixture is transported to the NMP synthesis reactor, the reactor is heated by heat transfer oil to obtain a high-temperature NMP reactant, and the outlet temperature is controlled at 270°C; the high-temperature NMP reactant is placed in a first cooling tower, and the NMP reactant is cooled by the first cooling tower to obtain a crude NMP product; the crude NMP product is moved to a distillation tower for fine processing to obtain a high-temperature NMP fine product, and the outlet temperature is controlled at 270°C; the high-temperature NMP reactant is placed in a first cooling tower, and the NMP reactant is cooled by the first cooling tower to obtain a crude NMP product; the crude NMP product is moved to a distillation tower for fine processing to obtain a high-temperature NMP fine product, and the outlet temperature is controlled at 270°C; the high-temperature NMP reactant is placed in a first cooling tower, and the NMP reactant is cooled by the first cooling tower to obtain a crude NMP product; the crude NMP product is moved to a distillation tower for fine processing to obtain a high-temperature NMP fine product, and the outlet temperature is controlled at 270°C; the high-temperature NMP reactant is placed in a first cooling tower, and the high-temperature ... The temperature is 285°C; the high-temperature NMP fine product is placed in the second cooling tower for cooling; the distillation tower, the first cooling tower, the second cooling tower, the NMP synthesis reactor and the stirrer are electrically connected by connecting lines to supply energy, and the sewage in the NMP synthesis reactor and the distillation tower is discharged through the sewage pipe and stored in the sewage tank; the sewage is transported to the deamination tower in sequence by means of a conveying pipeline for deamination operation, and then transported through an activated carbon filter plate to filter impurities in the sewage and reduce the odor of the sewage, and finally discharged after precipitation in a sedimentation tank to obtain purified water; the purified water is transported to the methylamine storage tank through a pipeline, and is adjusted by a valve at the same time, so that the concentration of methylamine can be adjusted and the purified water can be reused.

[0064] See also Figure 5 The present invention also provides an intelligent system for continuous energy-saving green production of NMP, including a humidity monitoring device, a temperature monitoring device, a concentration monitoring device, a metering device and a control server, wherein the humidity monitoring device, the temperature monitoring device, the concentration monitoring device and the metering device are all connected to the control server.

[0065] Among them, the temperature monitoring equipment can detect whether the temperature of the processed products in each device is within the qualified range. The humidity monitoring equipment can detect the humidity of crude NMP and fine NMP, and set a preset threshold at the same time. If the humidity exceeds the threshold, it is unqualified. The concentration monitoring equipment can measure the pH value of GBL and methylamine to determine whether their concentrations meet the production standards. Finally, all monitoring data are transmitted to the control server, which is remotely monitored by the staff and unified data management is carried out to ensure the production quality of NMP. In addition, the metering equipment can calculate the fine processing and rough processing time, production times, and the amount of GBL and methylamine to prevent the quality of NMP production from deteriorating due to exceeding the standard.

[0066] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A continuous energy-saving green production method for NMP, characterized in that: The steps include: GBL and methylamine are stored in separate storage tanks, and flow into a mixer in a preset ratio by adjusting valves to obtain a mixture; The mixture is transported to an NMP synthesis reactor, and the reactor is heated by heat transfer oil to obtain a high-temperature NMP reactant; Placing the high-temperature NMP reactant in a first cooling tower, cooling the NMP reactant by the first cooling tower to obtain a crude NMP product; The crude NMP product is moved to the distillation tower for fine processing to obtain high-temperature NMP fine products; Place the high-temperature NMP product into the second cooling tower for cooling; At the same time, the sewage in the NMP synthesis reactor and the distillation tower is discharged through the sewage pipe and stored in the sewage tank; The sewage is transported to the deamination tower in turn through the conveying pipeline for deamination operation, and then transported through the activated carbon filter plate to filter out impurities in the sewage and reduce the odor of the sewage. Finally, it is discharged after sedimentation in the sedimentation tank to obtain purified water. The purified water is transported to the methylamine storage tank through a pipeline and adjusted by a valve to adjust the concentration of methylamine and reuse the purified water.

2. The continuous energy-saving green production method of NMP as claimed in claim 1, characterized in that, In the step of storing GBL and methylamine in separate storage tanks, respectively, and controlling the flow rate by adjusting valves so that the GBL and methylamine flow into a mixer in a preset ratio to obtain a mixture: The stirring speed was 300 rpm and the stirring time was 1 hour.

3. The continuous energy-saving green production method of NMP as claimed in claim 2, characterized in that, In the step of conveying the mixture to an NMP synthesis reactor, heating the reactor with heat transfer oil to obtain a high-temperature NMP reactant: The outlet temperature is controlled at 260-275℃.

4. The continuous energy-saving green production method of NMP as claimed in claim 3, characterized in that, In the step of moving the crude NMP into the distillation tower for finishing to obtain high-temperature NMP fine products: The outlet temperature is 270-300℃.

5. The continuous energy-saving green production method of NMP as claimed in claim 4, characterized in that, In the step of placing the high-temperature NMP product into the second cooling tower for cooling: Energy is supplied by electrically connecting the distillation tower, the first cooling tower, the second cooling tower, the NMP synthesis reactor and the stirrer through connecting lines.

6. An intelligent system for continuous energy-saving green production of NMP, using the continuous energy-saving green production method of NMP as claimed in claim 5, characterized in that: It includes humidity monitoring equipment, temperature monitoring equipment, concentration monitoring equipment, metering equipment and a control server. The humidity monitoring equipment, the temperature monitoring equipment, the concentration monitoring equipment and the metering equipment are all connected to the control server.

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