Energy-saving methyl acetate production process device
By combining reactive distillation columns, purification columns, and recovery columns, along with reboilers and reflux pipes, heat recovery was achieved in the methyl acetate production process, solving the high energy consumption problem caused by azeotropic compounds, improving conversion rate, and reducing costs.
Patent Information
- Application Number
- CN202423195522.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-12-24
AI Technical Summary
In the production of methyl acetate, the azeotropic reaction between methyl acetate and methanol leads to high steam consumption and high energy consumption in the distillation process, thus increasing production costs.
The system employs a combination of a reactive distillation column, a first purification column, a second purification column, and a recovery column. Through the design of a reboiler and reflux pipeline, heat is recovered using the gas phase heat source at the top of the column, and the pressure and temperature inside the column are controlled to achieve efficient heat utilization.
This improved the conversion rate of methyl acetate and reduced process energy consumption and production costs.
Smart Images
Figure CN223602030U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the field of chemical industry environmental protection technology, especially relate to methyl acetate's production process device. BACKGROUND
[0002] Methyl acetate is an important chemical raw material and organic solvent solvent. Methyl acetate's production process uses acetic acid and methanol as raw materials, through reaction and rectification separation, finally get high purity methyl acetate product. At present, in the process of methyl acetate rectification separation, because methyl acetate and methanol azeotrope, will consume a large amount of steam, the energy consumption of rectification process, the production cost of methyl acetate is greatly influenced, and there is room for improvement in energy recovery. SUMMARY
[0003] The utility model aims at the above-mentioned existing problems and insufficient, the purpose of the utility model is to provide a kind of energy-saving methyl acetate production process device.
[0004] Technical scheme: in order to solve the above technical problem, the utility model adopts the following technical scheme: a kind of energy-saving methyl acetate production process device, including reaction rectification tower, first refining tower, second refining tower and recovery tower, the reaction rectification tower is equipped with methanol inlet and acetic acid inlet, the reaction rectification tower top is connected with first refining tower by pipeline, the bottom of the reaction rectification tower is connected with recovery tower by pipeline;
[0005] The top of the first refining tower is connected with the second refining tower by pipeline, and the top of the second refining tower is connected with the top reflux of the reaction rectification tower by pipeline;The bottom of the first refining tower and the second refining tower is equipped with methyl acetate product outlet;The top of the recovery tower is connected with the methanol inlet of the reaction rectification tower by pipeline;
[0006] The bottom of the reaction rectification tower, first refining tower, second refining tower and recovery tower is respectively connected with first reboiler, second reboiler, third reboiler and fourth reboiler by pipeline circulation;
[0007] The pipeline between the top of the first refining tower and the second refining tower passes through the first reboiler, which can provide heat source for the reaction rectification tower;
[0008] The pipeline connecting the top of the second refining tower with the reaction rectification reflux passes through the fourth reboiler, which can provide heat source for the recovery tower;
[0009] The top of the reaction rectification tower, first refining tower, second refining tower and recovery tower is respectively provided with reflux pipe, and the reflux pipe is provided with reflux control valve.
[0010] As a preferred, the top of the reaction rectification tower and recovery tower is provided with condenser.
[0011] As preferred, a reflux pipe connected with the first refining tower is further arranged on the connecting pipe between the first refining tower and the second refining tower.
[0012] Beneficial effects: compared with the prior art, the first refining tower and the second refining tower are used as the heat source supply of the bottom reboiler of the reaction rectifying tower and the recovery tower, the reflux pipe is arranged to ensure the full conversion of the methyl acetate, the conversion rate of the methyl acetate is improved, and the process energy consumption and product cost are reduced. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 It is a structure schematic view of the energy-saving methyl acetate production process device.
[0014] Among them, the reaction rectifying tower 1, the first refining tower 2, the second refining tower 3, the recovery tower 4, the condenser 5, the first reboiler 6, the second reboiler 7, the third reboiler 8 and the fourth reboiler 9. DETAILED DESCRIPTION
[0015] The present application will be further illustrated below in combination with the drawings and specific embodiments, and it should be understood that these embodiments are only used to illustrate the present application and are not used to limit the scope of the present application, and after reading the present application, various equivalent modifications of the present application by those skilled in the art all fall within the scope defined by the appended claims.
[0016] As shown in the drawings, Figure 1 The energy-saving methyl acetate production process device disclosed by the present application mainly comprises a reaction rectifying tower, a first refining tower, a second refining tower and a recovery tower, wherein:
[0017] The reaction rectifying tower is provided with a methanol inlet and an acetic acid inlet, the top of the reaction rectifying tower is connected with the first refining tower through a pipe, and the bottom of the reaction rectifying tower is connected with the recovery tower through a pipe after being connected with a condenser;
[0018] The top of the first refining tower is connected with the second refining tower through a pipe and is also refluxed to the first refining tower through a reflux pipe, the top of the second refining tower is refluxed to the top of the reaction rectifying tower through a pipe, the bottoms of the first refining tower and the second refining tower are both provided with a methyl acetate product outlet, and the top of the recovery tower is connected with the methanol inlet of the reaction rectifying tower through a pipe after being connected with a condenser;
[0019] The bottoms of the reaction rectifying tower, the first refining tower, the second refining tower and the recovery tower are respectively connected with a first reboiler, a second reboiler, a third reboiler and a fourth reboiler through pipes in circulation;
[0020] The pipeline between the first refining tower top and the second refining tower passes through the first reboiler, which can provide heat source for the reaction rectification tower; the pipeline between the second refining tower top and the reaction rectification tower reflux connection passes through the fourth reboiler, which can provide heat source for the recovery tower.
[0021] The reaction rectification tower, the first refining tower, the second refining tower and the recovery tower are respectively provided with reflux pipes, and the reflux pipes are provided with reflux control valves.
[0022] In the production process of methyl acetate, acetic acid and methanol raw materials are fed into the reaction rectification tower, the methyl acetate and methanol azeotrope at the tower top is sent to the first refining tower, and the methanol aqueous solution at the tower bottom is sent to the recovery tower.
[0023] The first refining tower is operated under pressure, and the tower top pressure is 0.5-1.0 MPaG; the gas phase at the tower top is used as the heat source of the reaction rectification tower bottom, and after recovering heat, it is condensed into liquid, part of which is returned to the first refining tower as reflux, and part of which is sent to the second refining tower as feed. The product methyl acetate is obtained at the tower bottom of the first refining tower.
[0024] The second refining tower is operated under pressure, and the tower top pressure is 1.0-2.0 MPaG; the gas phase at the tower top is used as the heat source of the recovery tower, and after recovering heat, it is condensed into liquid, part of which is returned to the second refining tower as reflux, and part of which is sent to the reaction rectification. The product methyl acetate is obtained at the tower bottom of the second refining tower.
[0025] The methanol recovered at the tower top of the recovery tower is returned to the reaction rectification tower, and the waste water at the tower bottom of the recovery tower is sent to the sewage treatment device.
[0026] The operation pressure of the reaction rectification tower, the first refining tower, the second refining tower and the recovery tower is controlled, the appropriate heat recovery temperature is matched, the temperature of the gas phase at the tower top of the first refining tower is controlled to be more than 10℃ higher than the temperature at the tower bottom of the reaction rectification tower, and the temperature of the gas phase at the tower top of the second refining tower is controlled to be more than 10℃ higher than the temperature at the tower bottom of the recovery tower.
Claims
1. An energy-saving methyl acetate production process apparatus, characterized in that: The reaction rectification column, the first refining column, the second refining column and the recovery column are connected by pipelines, the reaction rectification column is provided with a methanol inlet and an acetic acid inlet, the top of the reaction rectification column is connected with the first refining column by a pipeline, the bottom of the reaction rectification column is connected with the recovery column by a pipeline; the top of the first refining column is connected with the second refining column by a pipeline, the top of the second refining column is connected with the top reflux of the reaction rectification column by a pipeline, the bottoms of the first refining column and the second refining column are provided with methyl acetate product outlets, the top of the recovery column is connected with the methanol inlet of the reaction rectification column by a pipeline; the bottoms of the reaction rectification column, the first refining column, the second refining column and the recovery column are respectively connected with a first reboiler, a second reboiler, a third reboiler and a fourth reboiler by pipelines; the pipeline between the top of the first refining column and the second refining column passes through the first reboiler, which can provide a heat source for the reaction rectification column; the pipeline connecting the top of the second refining column with the top reflux of the reaction rectification column passes through the fourth reboiler, which can provide a heat source for the recovery column; the tops of the reaction rectification column, the first refining column, the second refining column and the recovery column are respectively provided with reflux pipes, and the reflux pipes are provided with reflux control valves.
2. The process as claimed in claim 1, wherein the said process is characterized by: the top outlet pipelines of the reaction rectification column and the recovery column are provided with condensers.
3. The process as claimed in claim 1, wherein the said process is characterized by: the connecting pipeline between the top of the first refining column and the second refining column is further provided with a reflux pipe connected with the first refining column.