CN109678711B - System and method for extracting methyl methoxypropionate from methyl acrylate waste oil - Google Patents
System and method for extracting methyl methoxypropionate from methyl acrylate waste oil Download PDFInfo
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Abstract
A system and a method for extracting methyl methoxypropionate from methyl acrylate waste oil belong to the field of methyl acrylate separation. The method is characterized in that: a washing tower discharge pipeline (5) at the top of the washing tower (1) is connected to an ester refining tower (6); the gas phase pipeline at the top of the ester refining tower (6) is connected with a condensing mechanism, and the condensing mechanism is connected with a reflux tank (7) through a pipeline. The extraction steps are as follows: adding washing water into the methyl acrylate waste oil to wash and recover acrylic acid in the methoxypropylene methyl ester; performing intermittent rectification, and collecting methyl methoxypropionate. The system can extract methyl methoxypropionate from waste oil generated in the production process of methyl acrylate for recycling. Meanwhile, acrylic acid in the waste oil can be extracted and enters an acrylic acid production device for purification, and qualified acrylic acid is produced.
Description
Technical Field
A system and a method for extracting methyl methoxypropionate from methyl acrylate waste oil belong to the field of methyl acrylate separation.
Background
In the production of methyl acrylate, acrylic acid is reacted with methanol in the presence of a resin to produce methyl acrylate. During the reaction of acrylic acid with methanol, methyl methoxypropionate is formed as an inevitable side reaction. The yield of methyl ester waste oil is about 360t/a calculated according to the yield of methyl acrylate of 5000 t/a. The waste oil can be treated only by adopting an incineration method, and does not accord with the national waste treatment policy. The content of the methyl methoxypropionate in the methyl ester waste oil is higher and can reach more than 50 percent. Has higher recycling value. The methyl methoxypropionate is colorless liquid with special fragrance, is an important organic solvent and an organic synthesis intermediate, is widely used in the fields of electronic industry, cleaning industry, coating industry, organic synthesis, medicine and the like, and has wide application. But now lacks a corresponding separation system and method.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: overcomes the defects of the prior art, and provides a system and a method for extracting methyl methoxypropionate from methyl acrylate waste oil, wherein the methyl methoxypropionate has high quality and less waste oil amount.
The technical scheme adopted by the invention for solving the technical problems is as follows: the system for extracting the methyl methoxypropionate from the methyl acrylate waste oil comprises a washing tower and an ester refining tower, and is characterized in that: the washing tower is provided with a feeding pipeline and a washing water pipeline, the lower part of the washing tower is provided with a recovered acid pipeline, and a washing tower discharging pipeline at the top of the washing tower is connected to the ester refining tower; the gas phase pipeline at the top of the ester refining tower is connected with a condensing mechanism, the condensing mechanism is connected with a reflux tank through a pipeline, a reflux pump is arranged below the reflux tank, and a light component discharge pipeline, a product discharge pipeline and a reflux pipeline are arranged at the outlet of the reflux pump; the condensing mechanism is connected with a pressure adjusting device for adjusting the air pressure of the condensing mechanism and the reflux tank through a pipeline; the tower bottom of the ester refining tower is provided with a waste liquid discharge pipeline.
The system can extract methyl methoxypropionate from waste oil generated in the production process of methyl acrylate for recycling. Meanwhile, acrylic acid in the waste oil can be extracted and enters an acrylic acid production device for purification, and qualified acrylic acid is produced. The method can be widely applied to extracting useful components in waste oil generated by a device, thereby not only reducing the waste generation amount and the waste treatment cost, but also obtaining better economic benefit.
Preferably, valves are arranged on the feeding pipeline, the washing water pipeline, the acid recovery pipeline, the washing tower discharging pipeline, the waste liquid discharging pipeline, the reflux pipeline, the light component discharging pipeline and the product discharging pipeline. All set up the valve of independent control on each pipeline, different operation routes are realized to control that can be timely.
Preferably, the condensation mechanism is a condenser, the condenser is connected with a gas phase outlet pipeline at the top of the ester refining tower, and a condensed product output pipeline is connected with the reflux tank.
Preferably, the pressure regulating device comprises a vacuum pump, a water sealing tank and a water sealing condenser, the vacuum pump is connected with the condensing mechanism through a pipeline, the water and waste gas discharge pipeline of the vacuum pump is connected with the water sealing tank, the bottom of the water sealing tank is connected with the water sealing condenser through a pipeline, and the water sealing condenser is connected with the vacuum pump through a pipeline.
Preferably, the pipeline connecting the condensing mechanism and the reflux tank is communicated to the bottom of the reflux tank. The condensed materials are directly communicated to the bottom of the reflux tank, a small amount of light components in the materials are gathered and separated in the rising process, and a large amount of materials do not directly enter the light component layering, so that the light components are carried into required products.
A method for extracting methyl methoxypropionate from methyl acrylate waste oil by using the system is characterized by comprising the following extraction steps:
1) adding methyl acrylate waste oil into the washing tower through a feed pipeline; washing water is added into the upper part of the washing tank through a washing water pipeline;
2) controlling the temperature of a tower kettle of the washing tower to be 38-42 ℃; controlling the pressure to be 256 kPa-296 kPa;
3) recovering acrylic acid in the methoxypropene methyl esters at the bottom of the washing tower;
4) performing intermittent rectification in the ester refining tower, and adjusting the pressure in the condensing mechanism and the reflux tank to be 5.5-6.5 kPa through a pressure adjusting device; condensing a gas-phase product distilled from the top of the ester refining tower by a condensing mechanism to obtain a condensed mixed solution at the temperature of 23-33 ℃;
5) the condensed mixed liquid enters a reflux tank, the temperature in the reflux tank is kept at 23-33 ℃, and the height of the condensed liquid in the reflux tank is controlled at 50-80%; collecting methyl methoxypropionate from a product discharge pipeline to obtain the product.
Methyl ester waste oil is added into a washing tower and washed by washing water (desalted water), waste acid at the tower bottom enters an acrylic acid device for recycling, materials at the tower top enter an ester refining tower for intermittent rectification, the waste oil is discharged from the tower bottom after the intermittent rectification in the ester refining tower, and different products are obtained at the tower top according to different rectification time and temperature. Most of the recovery is a purification and separation process, the related chemical reaction is a simple neutralization process and the like, and the process basically has no risk.
Preferably, the temperature of the tower kettle of the washing tower in the step 2) is controlled to be 40-41 ℃; the pressure is controlled to be 276 kPa to 280 kPa. The optimal washing tower process conditions can ensure that the waste acid is separated more thoroughly, and the purity of the product is better ensured.
Preferably, the pressure in the condensing mechanism and the reflux tank in the step 4) is 5.8 kPa-6.2 kPa. The preferable pressure in the condensation mechanism and the reflux tank is more favorable for separating the methyl methoxypropionate product and the light components, the separation efficiency is higher, and the mutual residue is less.
Compared with the prior art, the system and the method for extracting the methyl methoxypropionate from the methyl acrylate waste oil have the beneficial effects that: the system can extract methyl methoxypropionate from waste oil generated in the production process of methyl acrylate for recycling. Meanwhile, acrylic acid in the waste oil can be extracted and enters an acrylic acid production device for purification, and qualified acrylic acid is produced. The method can be widely applied to extracting useful components in waste oil generated by a device, thereby not only reducing the waste generation amount and the waste treatment cost, but also obtaining better economic benefit. After washing and refining, the waste oil yield is only 50% of the original yield. Has obvious economic benefit and social benefit. The transportation cost and the incineration cost are reduced. Meets the increasingly severe environmental protection requirements. The extracted methyl methoxypropionate has wide application, increases the utilization rate of materials and improves the productivity.
Drawings
FIG. 1 is a schematic diagram of a system for extracting methyl methoxypropionate from methyl acrylate waste oil according to the present invention.
Wherein: 1. the device comprises a washing tower 2, a feeding pipeline 3, a washing water pipeline 4, a recovered acid pipeline 5, a washing tower discharging pipeline 6, an ester refining tower 7, a reflux tank 8, a condenser 9, a reflux pump 10, a reflux pipeline 11, a light component discharging pipeline 12, a product discharging pipeline 13, a vacuum pump 14, a water sealing tank 15, a water sealing condenser 16 and a waste liquid discharging pipeline.
Detailed Description
The present invention is further described with reference to fig. 1 and the following detailed description, wherein example 1 is the preferred embodiment.
Referring to figure 1: a system for extracting methyl methoxypropionate from methyl acrylate waste oil comprises a washing tower 1, an ester refining tower 6, a condenser 8, a vacuum pump 13, a water sealing tank 14 and a water sealing condenser 15, wherein the washing tower 1 is provided with a feeding pipeline 2 and a washing water pipeline 3, the lower part of the washing tower 1 is provided with a recovered acid pipeline 4, and a washing tower discharging pipeline 5 at the top of the washing tower 1 is connected to the ester refining tower 6; a gas phase pipeline at the top of the ester refining tower 6 is connected with a condenser 8 and is connected with a gas phase outlet pipeline at the top of the ester refining tower 6, a condensed product output pipeline is connected with a reflux tank 7, a pipeline connecting the condenser 8 and the reflux tank 7 is communicated to the bottom of the reflux tank 7, a reflux pump 9 is further arranged below the reflux tank 7, and a light component discharge pipeline 11, a product discharge pipeline 12 and a reflux pipeline 10 are arranged at the outlet of the reflux pump 9; the condensation mechanism is connected with a pressure adjusting device for adjusting the air pressure of the condensation mechanism and the reflux tank 7 through pipelines, the pressure adjusting device comprises a vacuum pump 13, a water sealing tank 14 and a water sealing condenser 15, the vacuum pump 13 is connected with the condensation mechanism through a pipeline, a water and waste gas discharge pipeline of the vacuum pump 13 is connected with the water sealing tank 14, the bottom of the water sealing tank 14 is connected with the water sealing condenser 15 through a pipeline, and the water sealing condenser 15 is connected with the vacuum pump 13 through a pipeline; a waste liquid discharge pipeline 16 is arranged at the tower bottom of the ester refining tower 6; all be equipped with the valve on feed line 2, wash water pipeline 3, recovered acid pipeline 4, scrubbing tower discharging line 5, waste liquid discharging line 16, backflow pipeline 10, light component discharging line 11 and the product discharging line 12, conveniently control the trend of material and supply and stop.
Example 1
1) The washing tower 1 is added with methyl acrylate waste oil through a feed line 2; washing water is added into the upper part of the washing kettle through a washing water pipeline 3;
2) the temperature of a tower kettle of the washing tower 1 is controlled at 40.5 ℃; the pressure is controlled at 278 kPa;
3) acrylic acid in the methoxypropene methyl esters is recovered from the bottom of the washing tower 1;
4) intermittent rectification is carried out in the ester refining tower 6, and the pressure in the condensing mechanism and the reflux tank 7 is regulated to be 6.0kPa through a pressure regulating device; condensing a gas-phase product distilled from the top of the ester refining tower 6 by a condensing mechanism to obtain a condensed mixed solution with the temperature of 28 ℃;
5) the condensed mixed liquid enters a reflux tank 7, the temperature in the reflux tank 7 is kept at 28 ℃, and the height of the condensed liquid in the reflux tank 7 is controlled to be 65-75%; collecting methyl methoxypropionate from a product discharge pipeline 12; the waste oil yield is only 43 percent of the original waste oil yield; the purity of the obtained methyl methoxypropionate was 99.5%.
Example 2
1) The washing tower 1 is added with methyl acrylate waste oil through a feed line 2; washing water is added into the upper part of the washing kettle through a washing water pipeline 3;
2) the temperature of a tower kettle of the washing tower 1 is controlled at 41 ℃; the pressure is controlled at 276 kPa;
3) acrylic acid in the methoxypropene methyl esters is recovered from the bottom of the washing tower 1;
4) intermittent rectification is carried out in the ester refining tower 6, and the pressure in the condensing mechanism and the reflux tank 7 is regulated to be 6.2kPa by a pressure regulating device; condensing a gas-phase product distilled from the top of the ester refining tower 6 by a condensing mechanism to obtain a condensed mixed solution at the temperature of 30 ℃;
5) the condensed mixed liquid enters a reflux tank 7, the temperature in the reflux tank 7 is kept at 30 ℃, and the height of the condensed liquid in the reflux tank 7 is controlled to be 60-70%; collecting methyl methoxypropionate from a product discharge pipeline 12; the waste oil yield is only 45 percent of the original yield; the purity of the obtained methyl methoxypropionate was 99.3%.
Example 3
1) The washing tower 1 is added with methyl acrylate waste oil through a feed line 2; washing water is added into the upper part of the washing kettle through a washing water pipeline 3;
2) the temperature of a tower kettle of the washing tower 1 is controlled at 40 ℃; the pressure is controlled at 280 kPa;
3) acrylic acid in the methoxypropene methyl esters is recovered from the bottom of the washing tower 1;
4) intermittent rectification is carried out in the ester refining tower 6, and the pressure in the condensing mechanism and the reflux tank 7 is regulated to be 5.8 kPa through a pressure regulating device; condensing a gas-phase product distilled from the top of the ester refining tower 6 by a condensing mechanism to obtain a condensed mixed solution at the temperature of 25 ℃;
5) the condensed mixed liquid enters a reflux tank 7, the temperature in the reflux tank 7 is kept at 25 ℃, and the height of the condensed liquid in the reflux tank 7 is controlled to be 60-65%; collecting methyl methoxypropionate from a product discharge pipeline 12; the waste oil production amount is only 46 percent of the original waste oil production amount; the purity of the obtained methyl methoxypropionate was 99.3%.
Example 4
1) The washing tower 1 is added with methyl acrylate waste oil through a feed line 2; washing water is added into the upper part of the washing kettle through a washing water pipeline 3;
2) the temperature of a tower kettle of the washing tower 1 is controlled at 38 ℃; the pressure is controlled at 296 kPa;
3) acrylic acid in the methoxypropene methyl esters is recovered from the bottom of the washing tower 1;
4) intermittent rectification is carried out in the ester refining tower 6, and the pressure in the condensing mechanism and the reflux tank 7 is regulated to be 5.5 kPa by a pressure regulating device; condensing a gas-phase product distilled from the top of the ester refining tower 6 by a condensing mechanism to obtain a condensed mixed solution at the temperature of 33 ℃;
5) the condensed mixed liquid enters a reflux tank 7, the temperature in the reflux tank 7 is kept at 33 ℃, and the height of the condensed liquid in the reflux tank 7 is controlled to be 50-70%; collecting methyl methoxypropionate from a product discharge pipeline 12; the waste oil yield is only 48 percent of the original yield; the purity of the obtained methyl methoxypropionate was 99.1%.
Example 5
1) The washing tower 1 is added with methyl acrylate waste oil through a feed line 2; washing water is added into the upper part of the washing kettle through a washing water pipeline 3;
2) the temperature of a tower kettle of the washing tower 1 is controlled at 42 ℃; the pressure is controlled at 256 kPa;
3) acrylic acid in the methoxypropene methyl esters is recovered from the bottom of the washing tower 1;
4) intermittent rectification is carried out in the ester refining tower 6, and the pressure in the condensing mechanism and the reflux tank 7 is regulated to 6.5kPa by a pressure regulating device; condensing a gas-phase product distilled from the top of the ester refining tower 6 by a condensing mechanism to obtain a condensed mixed solution with the temperature of 23 ℃;
5) the condensed mixed liquid enters a reflux tank 7, the temperature in the reflux tank 7 is kept at 23 ℃, and the height of the condensed liquid in the reflux tank 7 is controlled to be 70-80%; collecting methyl methoxypropionate from a product discharge pipeline 12; the waste oil yield is only 50 percent of the original yield; the purity of the obtained methyl methoxypropionate was 99.1%.
Comparative example 1
1) The washing tower 1 is added with methyl acrylate waste oil through a feed line 2; washing water is added into the upper part of the washing kettle through a washing water pipeline 3;
2) the temperature of a tower kettle of the washing tower 1 is controlled at 50 ℃; the pressure is controlled at 400 kPa;
3) acrylic acid in the methoxypropene methyl esters is recovered from the bottom of the washing tower 1;
4) intermittent rectification is carried out in the ester refining tower 6, and the pressure in the condensing mechanism and the reflux tank 7 is regulated to be 6.0kPa through a pressure regulating device; condensing a gas-phase product distilled from the top of the ester refining tower 6 by a condensing mechanism to obtain a condensed mixed solution with the temperature of 28 ℃;
5) the condensed mixed liquid enters a reflux tank 7, the temperature in the reflux tank 7 is kept at 28 ℃, and the height of the condensed liquid in the reflux tank 7 is controlled to be 65-75%; collecting methyl methoxypropionate from a product discharge pipeline 12; the waste oil production is 82% of the original production; the purity of the obtained methyl methoxypropionate was 82.1%.
Comparative example 2
1) The washing tower 1 is added with methyl acrylate waste oil through a feed line 2; washing water is added into the upper part of the washing kettle through a washing water pipeline 3;
2) the temperature of a tower kettle of the washing tower 1 is controlled at 40.5 ℃; the pressure is controlled at 278 kPa;
3) acrylic acid in the methoxypropene methyl esters is recovered from the bottom of the washing tower 1;
4) intermittent rectification is carried out in the ester refining tower 6, and the pressure in the condensing mechanism and the reflux tank 7 is adjusted to be 4.0kPa through a pressure adjusting device; condensing a gas-phase product distilled from the top of the ester refining tower 6 by a condensing mechanism to obtain a condensed mixed solution with the temperature of 28 ℃;
5) the condensed mixed liquid enters a reflux tank 7, the temperature in the reflux tank 7 is kept at 28 ℃, and the height of the condensed liquid in the reflux tank 7 is controlled to be 65-75%; collecting methyl methoxypropionate from a product discharge pipeline 12; the waste oil production is 52% of the original production; the purity of the obtained methyl methoxypropionate was 89.5%.
Comparative example 3
1) The methyl acrylate waste oil is directly added into an ester refining tower 6 for intermittent rectification, and the pressure in a condensing mechanism and a reflux tank 7 is regulated to be 6.0kPa by a pressure regulating device; condensing a gas-phase product distilled from the top of the ester refining tower 6 by a condensing mechanism to obtain a condensed mixed solution with the temperature of 28 ℃;
2) the condensed mixed liquid enters a reflux tank 7, the temperature in the reflux tank 7 is kept at 28 ℃, and the height of the condensed liquid in the reflux tank 7 is controlled to be 65-75%; collecting methyl methoxypropionate from a product discharge pipeline 12; the waste oil production is 87% of the original waste oil production; the purity of the obtained methyl methoxypropionate was 74.3%.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (7)
1. A method for extracting methyl methoxypropionate from methyl acrylate waste oil is characterized in that: the extraction steps are as follows:
1) the washing tower (1) is added with methyl acrylate waste oil through a feeding pipeline (2); washing water is added into the upper part of the washing tank through a washing water pipeline (3);
2) the temperature of a tower kettle of the washing tower (1) is controlled to be 38-42 ℃; controlling the pressure to be 256 kPa-296 kPa;
3) acrylic acid in methyl methoxypropionate is recovered from the bottom of the washing tower (1);
4) performing intermittent rectification in the ester refining tower (6), and adjusting the pressure in the condensing mechanism and the reflux tank (7) to be 5.5-6.5 kPa through a pressure adjusting device; condensing a gas-phase product distilled from the tower top of the ester refining tower (6) by a condensing mechanism to obtain a condensed mixed solution at the temperature of 23-33 ℃;
5) the condensed mixed liquid enters a reflux tank (7), the temperature in the reflux tank (7) is kept at 23-33 ℃, and the height of the condensed liquid in the reflux tank (7) is controlled at 50-80%; collecting methyl methoxypropionate from a product discharge pipeline (12);
the system required by the method comprises a washing tower (1) and an ester refining tower (6), wherein the washing tower (1) is provided with a feeding pipeline (2) and a washing water pipeline (3), the lower part of the washing tower is provided with a recovered acid pipeline (4), and a washing tower discharging pipeline (5) at the top of the washing tower (1) is connected to the ester refining tower (6); a gas phase pipeline at the top of the ester refining tower (6) is connected with a condensing mechanism, the condensing mechanism is connected with a reflux tank (7) through a pipeline, a reflux pump (9) is arranged below the reflux tank (7), and an outlet of the reflux pump (9) is provided with a light component discharge pipeline (11), a product discharge pipeline (12) and a reflux pipeline (10); the condensing mechanism is connected with a pressure adjusting device for adjusting the pressure of the condensing mechanism and the reflux tank (7) through a pipeline; the bottom of the ester refining tower (6) is provided with a waste liquid discharge pipeline (16).
2. The process of claim 1, wherein the methyl methoxypropionate is extracted from methyl acrylate waste oil by the following steps: the device is characterized in that valves are arranged on the feeding pipeline (2), the washing water pipeline (3), the acid recovery pipeline (4), the washing tower discharging pipeline (5), the waste liquid discharging pipeline (16), the reflux pipeline (10), the light component discharging pipeline (11) and the product discharging pipeline (12).
3. The process of claim 1, wherein the methyl methoxypropionate is extracted from methyl acrylate waste oil by the following steps: the condensation mechanism is a condenser (8), the condenser (8) is connected with a gas phase outlet pipeline at the top of the ester refining tower (6), and a condensed product output pipeline is connected with the reflux tank (7).
4. The process of claim 1, wherein the methyl methoxypropionate is extracted from methyl acrylate waste oil by the following steps: the pressure adjusting device comprises a vacuum pump (13), a water sealing tank (14) and a water sealing condenser (15), wherein the vacuum pump (13) is connected with a condensing mechanism through a pipeline, a water and waste gas discharge pipeline of the vacuum pump (13) is connected with the water sealing tank (14), the bottom of the water sealing tank (14) is connected with the water sealing condenser (15) through a pipeline, and the water sealing condenser (15) is connected with the vacuum pump (13) through a pipeline.
5. The process of claim 1, wherein the methyl methoxypropionate is extracted from methyl acrylate waste oil by the following steps: and a pipeline for connecting the condensing mechanism and the reflux tank (7) is communicated to the bottom of the reflux tank (7).
6. The process of claim 1, wherein the methyl methoxypropionate is extracted from methyl acrylate waste oil by the following steps: the temperature of the tower kettle of the washing tower (1) in the step 2) is controlled to be 40-41 ℃; the pressure is controlled to be 276 kPa to 280 kPa.
7. The process of claim 1, wherein the methyl methoxypropionate is extracted from methyl acrylate waste oil by the following steps: and (3) the pressure in the condensation mechanism and the reflux tank (7) in the step 4) is 5.8-6.2 kPa.
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| CN1553889A (en) * | 2001-09-10 | 2004-12-08 | �����ɷ� | Method for producing (meth)acrylic acid esters |
| CN104707354A (en) * | 2015-04-02 | 2015-06-17 | 山东开泰石化股份有限公司 | Methylbenzene separation system in acrylic acid device and method |
| CN104892410A (en) * | 2015-04-28 | 2015-09-09 | 江苏新东风化工科技有限公司 | Methyl acrylate waste oil recovery technology |
| CN205893126U (en) * | 2016-07-04 | 2017-01-18 | 江苏斯尔邦石化有限公司 | A device for MMA scrubbing tower acidity elimination methods |
| CN106554019A (en) * | 2015-09-29 | 2017-04-05 | 新特能源股份有限公司 | A kind of technique of trichlorosilane synthetic tail gas cleaning system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3012447B1 (en) * | 2013-10-29 | 2017-01-20 | Arkema France | PROCESS FOR THE PRODUCTION OF LIGHT (METH) ACRYLIC ESTERS |
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2017
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1553889A (en) * | 2001-09-10 | 2004-12-08 | �����ɷ� | Method for producing (meth)acrylic acid esters |
| CN104707354A (en) * | 2015-04-02 | 2015-06-17 | 山东开泰石化股份有限公司 | Methylbenzene separation system in acrylic acid device and method |
| CN104892410A (en) * | 2015-04-28 | 2015-09-09 | 江苏新东风化工科技有限公司 | Methyl acrylate waste oil recovery technology |
| CN106554019A (en) * | 2015-09-29 | 2017-04-05 | 新特能源股份有限公司 | A kind of technique of trichlorosilane synthetic tail gas cleaning system |
| CN205893126U (en) * | 2016-07-04 | 2017-01-18 | 江苏斯尔邦石化有限公司 | A device for MMA scrubbing tower acidity elimination methods |
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