CN210945433U - Propylene glycol methyl ether rectification purification system - Google Patents
Propylene glycol methyl ether rectification purification system Download PDFInfo
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- CN210945433U CN210945433U CN201922044741.0U CN201922044741U CN210945433U CN 210945433 U CN210945433 U CN 210945433U CN 201922044741 U CN201922044741 U CN 201922044741U CN 210945433 U CN210945433 U CN 210945433U
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- tower
- dimethyl ether
- methyl ether
- propylene glycol
- ether tower
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- ARXJGSRGQADJSQ-UHFFFAOYSA-N 1-methoxypropan-2-ol Chemical compound COCC(C)O ARXJGSRGQADJSQ-UHFFFAOYSA-N 0.000 title claims abstract description 75
- 238000000746 purification Methods 0.000 title claims abstract description 18
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 claims abstract description 75
- 239000007788 liquid Substances 0.000 claims abstract description 41
- 238000010992 reflux Methods 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims description 20
- 238000005070 sampling Methods 0.000 claims description 14
- 239000012043 crude product Substances 0.000 claims description 13
- 239000012071 phase Substances 0.000 claims description 12
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 10
- 239000007791 liquid phase Substances 0.000 claims description 8
- YTTFFPATQICAQN-UHFFFAOYSA-N 2-methoxypropan-1-ol Chemical compound COC(C)CO YTTFFPATQICAQN-UHFFFAOYSA-N 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000002904 solvent Substances 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 5
- 239000000446 fuel Substances 0.000 description 4
- 239000007798 antifreeze agent Substances 0.000 description 3
- 238000009835 boiling Methods 0.000 description 3
- 239000003085 diluting agent Substances 0.000 description 3
- 239000002270 dispersing agent Substances 0.000 description 3
- 239000004721 Polyphenylene oxide Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 229920000570 polyether Polymers 0.000 description 2
- JDSQBDGCMUXRBM-UHFFFAOYSA-N 2-[2-(2-butoxypropoxy)propoxy]propan-1-ol Chemical compound CCCCOC(C)COC(C)COC(C)CO JDSQBDGCMUXRBM-UHFFFAOYSA-N 0.000 description 1
- WVQBLGZPHOPPFO-UHFFFAOYSA-N 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(1-methoxypropan-2-yl)acetamide Chemical compound CCC1=CC=CC(C)=C1N(C(C)COC)C(=O)CCl WVQBLGZPHOPPFO-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 125000001033 ether group Chemical group 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000002363 herbicidal effect Effects 0.000 description 1
- 239000004009 herbicide Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- -1 printing and dyeing Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The utility model discloses a propylene glycol methyl ether rectification purification system and method thereof, including crude feed pump, positive methyl ether tower reboiler, positive methyl ether tower cauldron cistern, positive methyl ether tower cauldron liquid pump, positive methyl ether tower condenser, positive methyl ether tower condensate intermediate tank, positive methyl ether tower reflux pump, positive methyl ether intermediate tank and positive methyl ether cooler. The utility model has the advantages of improved the separation effect of propylene glycol methyl ether and 2-methoxy-1-propanol, improved propylene glycol methyl ether's yield.
Description
Technical Field
The utility model belongs to propylene glycol methyl ether production field especially relates to a rectification purification system in propylene glycol methyl ether production process.
Background
Propylene glycol methyl ether belongs to a glycol ether solvent, and the toxicity of propylene glycol ether to human bodies belongs to low-toxicity ethers. Propylene glycol methyl ether has weak ether smell but no strong pungent smell, so that the application of the propylene glycol methyl ether is wider and safer. Because the molecular structure of the polyether has ether group and hydroxyl group, the polyether has excellent solubility, proper volatilization rate, reaction activity and other characteristics, and thus has wide application.
Propylene glycol methyl ether is mainly used as a solvent, a dispersant and a diluent, and also used as a fuel antifreeze agent, an extractant and the like; is an intermediate of the herbicide metolachlor; used as solvent, dispersant or diluent in the industries of paint, ink, printing and dyeing, pesticide, cellulose, acrylate and the like. It can also be used as fuel antifreeze agent, cleaning agent, extractant, nonferrous metal beneficiation agent, etc. Can also be used as organic synthesis raw materials; the solvent is mainly used as an excellent solvent of nitrocellulose, alkyd resin and cis-anhydride modified phenolic resin, and is used as an anti-freezing agent of jet fuel, an additive of brake fluid and the like; the composite material is mainly used as a solvent, a dispersant and a diluent, and also used as a fuel antifreeze agent, an extractant and the like.
Propylene glycol methyl ether is used as an excellent organic solvent, and has a high value, so the yield of the propylene glycol methyl ether is improved in the production process, the product yield is improved as much as possible, in the current production process, 2-methoxy-1-propanol (which is an isomer with propylene glycol methyl ether) is generated in the reaction process, the difference between the boiling points of the two (propylene glycol methyl ether is 120 ℃, and the temperature of the 2-methoxy-1-propanol is 121 ℃) is 1 ℃, the two are difficult to separate in the rectification process, the heavy component generated by rectification can only be treated as waste liquid in the later stage, but the content of the propylene glycol methyl ether in the heavy component is 20%, so that great loss is caused; therefore, a rectification mode is needed to be selected, so that the two can be separated as much as possible in the production process, the loss of materials can be reduced, and the benefit maximization is realized.
Therefore, how to design a system which has better rectification and purification effects in the production process of propylene glycol methyl ether becomes a problem to be solved currently.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a propylene glycol methyl ether rectification purification system to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a propylene glycol methyl ether rectification purification system comprises a crude product feed pump, an n-methyl ether tower reboiler, an n-methyl ether tower kettle liquid tank, an n-methyl ether tower kettle liquid pump, an n-methyl ether tower condenser, an n-methyl ether tower condensate intermediate tank, an n-methyl ether tower reflux pump, an n-methyl ether intermediate tank and an n-methyl ether cooler;
the outlet of the crude product feed pump is connected with the first feed inlet of the n-dimethyl ether tower;
the gas phase port of the n-dimethyl ether tower kettle reboiler is connected with the lateral gas phase port at the bottom of the n-dimethyl ether tower, and the liquid phase port of the n-dimethyl ether tower kettle reboiler is connected with the liquid phase port at the bottom of the n-dimethyl ether tower;
the tower top gas phase port of the n-dimethyl ether tower is connected with the gas phase inlet of the n-dimethyl ether tower condenser;
a condensate sampling port of the n-dimethyl ether tower condenser is connected with a feed port of the n-dimethyl ether condensate intermediate tank;
the discharge port of the intermediate tank of the n-dimethyl ether condensate is connected with the inlet of a reflux pump of the n-dimethyl ether tower;
the outlet of the n-dimethyl ether tower reflux pump is respectively connected with a reflux port at the top of the n-dimethyl ether tower and a feed inlet of the n-dimethyl ether cooler through branch pipelines;
the discharge hole of the n-dimethyl ether cooler is connected with the bottom feed inlet of the n-dimethyl ether intermediate tank;
the liquid phase outlet at the bottom of the n-methyl ether tower is connected with the inlet of the liquid tank of the n-methyl ether tower;
the discharge port of the liquid tank of the dimethyl ether tower kettle is connected with the inlet of a dimethyl ether kettle liquid pump;
an outlet of the orthomethyl ether tower kettle liquid pump is connected with an output pipeline, the output pipeline is connected with subsequent rectification equipment, and an adjusting pipeline is further arranged between the output pipeline and a second feeding hole of the orthomethyl ether tower.
Furthermore, a crude product tower inlet flow meter is arranged on a pipeline between the crude product feeding pump and the first feeding hole of the n-dimethyl ether tower.
Furthermore, a material tower inlet flow meter is arranged on the adjusting pipeline.
Furthermore, a sampling port is arranged on the output pipeline.
Furthermore, the adjusting pipeline is provided with an adjusting valve for controlling the feeding amount of the material in the liquid tank of the dimethyl ether tower entering the dimethyl ether tower.
Furthermore, the number of the n-dimethyl ether kettle liquid pumps, the number of the n-dimethyl ether tower reflux pumps and the number of the n-dimethyl ether intermediate tanks are all 2, and the n-dimethyl ether kettle liquid pumps, the n-dimethyl ether tower reflux pumps and the n-dimethyl ether intermediate tanks are arranged in parallel.
The utility model has the advantages that: because the boiling points of the propylene glycol methyl ether and the 2-methoxy-1-propanol are close, the output pipeline is connected with the second feed inlet of the n-methyl ether tower through the adjusting pipeline, the heavy component in the liquid tank of the n-methyl ether tower is directly subjected to subsequent treatment instead of entering the tower again to participate in rectification, namely, the content of each component in a material system in the tower is adjusted, the scheme mainly increases the content of the 2-methoxy-1-propanol in the system, thereby improving the separation effect; the full purification of propylene glycol methyl ether in heavy components in the production process is ensured, and the loss of materials is reduced; thereby improving the yield of propylene glycol methyl ether.
Drawings
FIG. 1 is a schematic structural diagram of a propylene glycol methyl ether rectification and purification system of the utility model;
wherein: the system comprises a 1-n-methyl ether tower reboiler, a 2-n-methyl ether tower, a 3-n-methyl ether tower liquid tank, a 4-n-methyl ether tower liquid pump, a 5-n-methyl ether tower condenser, a 6-n-methyl ether tower condensate intermediate tank, a 7-n-methyl ether tower reflux pump, an 8-n-methyl ether intermediate tank, a 9-n-methyl ether cooler, a 10-first feeding hole, a 11-second feeding hole, a 12-crude product tower inlet flow meter, a 13-material tower inlet flow meter, a 14-regulating valve, a 15-sampling port, a 16-output pipeline and a 17-regulating pipeline.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, the utility model provides a propylene glycol methyl ether rectification purification system, including crude charge pump, positive methyl ether tower reboiler 1, positive methyl ether tower 2, positive methyl ether tower cauldron cistern 3, positive methyl ether tower cauldron liquid pump 4, positive methyl ether tower condenser 5, positive methyl ether tower condensate intermediate tank 6, positive methyl ether tower reflux pump 7, positive methyl ether intermediate tank 8 and positive methyl ether cooler 9.
The outlet of the crude product feed pump is connected with a first feed inlet 10 of an n-dimethyl ether tower 2, the gas phase port of an n-dimethyl ether tower reboiler 1 is connected with the lateral gas phase port at the bottom of the n-dimethyl ether tower 2, the liquid phase port of the n-dimethyl ether tower reboiler 1 is connected with the liquid phase port at the bottom of the n-dimethyl ether tower 2, the gas phase port at the top of the n-dimethyl ether tower 2 is connected with the gas phase inlet of an n-dimethyl ether tower condenser 5, the condensate sampling outlet of the n-dimethyl ether tower condenser 5 is connected with the feed inlet of an n-dimethyl ether condensate intermediate tank 6, the discharge outlet of the n-dimethyl ether condensate intermediate tank 6 is connected with the inlet of an n-dimethyl ether tower reflux pump 7, the outlet of the n-dimethyl ether tower reflux pump 7 is respectively connected with the reflux port at the top of the n-dimethyl ether tower 2 and the feed inlet of an n-dimethyl ether cooler 9, the discharge outlet of the n-dimethyl ether cooler, the discharge port of the dimethyl ether tower liquid tank 3 is connected with the inlet of the dimethyl ether kettle liquid pump 4, the outlet of the dimethyl ether tower liquid pump 4 is connected with the output pipeline 16, the output pipeline 16 is connected with the subsequent rectification equipment, and an adjusting pipeline 17 is further arranged between the output pipeline 16 and the second feed port 11 of the dimethyl ether tower 2.
The number of the n-dimethyl ether kettle liquid pumps 4, the n-dimethyl ether tower reflux pumps 7 and the n-dimethyl ether intermediate tank 8 is 2, and the n-dimethyl ether kettle liquid pumps, the n-dimethyl ether tower reflux pumps and the n-dimethyl ether intermediate tank are arranged in parallel.
A crude product tower inlet flow meter 12 is arranged on a pipeline between the crude product feed pump and the first feed inlet 10 of the dimethyl ether tower 2, a material tower inlet flow meter 13 and an adjusting valve 14 for controlling the feed quantity of materials in the liquid tank 3 of the dimethyl ether tower to enter the dimethyl ether tower are sequentially arranged on an adjusting pipeline 17, and a sampling port 15 is arranged on an output pipeline 16.
The rectification purification of propylene glycol monomethyl ether comprises the following steps:
1) closing the regulating valve 14 on the regulating pipeline 17, starting to carry out primary rectification on the propylene glycol methyl ether crude product, opening the second feed inlet 11 of the n-methyl ether tower 2 when the liquid level of the n-methyl ether tower liquid tank 3 reaches 65%, opening the regulating valve 16 on the regulating pipeline 17, and pumping the material in the n-methyl ether tower liquid tank 3 into the n-methyl ether tower 2.
2) The feed rate of the material in the liquid tank 3 of the dimethyl ether tower entering the dimethyl ether tower 2 is controlled by the regulating valve 16, when the material is continuously fed into the dimethyl ether tower 2 through the second feed port 11 of the dimethyl ether tower, the reflux flow rate is controlled by the material feed tower flow meter 13 to be 2-3 m3/h, the temperature of the dimethyl ether tower 2 is controlled to be 155-165 ℃, the temperature of the second feed port 11 of the dimethyl ether tower 2 is controlled to be 135-155 ℃, the top temperature of the dimethyl ether tower 2 is controlled to be 130-140 ℃, and the liquid level balance of the liquid tank 3 of the dimethyl ether tower is controlled to be 65%.
3) Sampling and analyzing from a sampling port 15, judging the rectification effect, and obtaining that the content of propylene glycol methyl ether in the material in the dimethyl ether kettle liquid tank 3 is less than 1% through sampling and analyzing.
The original rectification scheme is as follows: closing an adjusting valve on the adjusting pipeline, so that the material in the liquid tank of the dimethyl ether tower cannot enter the dimethyl ether tower, and sampling and analyzing at a sampling point to obtain that the content of propylene glycol methyl ether in the material in the liquid tank of the dimethyl ether tower is about 5 percent; after the adjusting pipeline is added, the adjusting valve is opened, and sampling analysis at a sampling point shows that the content of propylene glycol methyl ether in the liquid tank material of the dimethyl ether tower is less than 1%.
Because the boiling points of the propylene glycol methyl ether and the 2-methoxy-1-propanol are close, the output pipeline is connected with the second feed inlet of the n-methyl ether tower through the adjusting pipeline, the heavy component in the liquid tank of the n-methyl ether tower is directly subjected to subsequent treatment instead of entering the tower again for rectification, namely, the content of each component in a material system in the tower is adjusted, the scheme mainly increases the content of the 2-methoxy-1-propanol in the system, thereby improving the separation effect, ensuring the full purification of the propylene glycol methyl ether in the heavy component in the production process and reducing the loss of the material; thereby improving the yield of propylene glycol methyl ether.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a propylene glycol methyl ether rectification purification system which characterized in that:
the system comprises a crude product feed pump, an n-methyl ether tower reboiler, an n-methyl ether tower kettle liquid tank, an n-methyl ether tower kettle liquid pump, an n-methyl ether tower condenser, an n-methyl ether tower condensate intermediate tank, an n-methyl ether tower reflux pump, an n-methyl ether intermediate tank and an n-methyl ether cooler;
the outlet of the crude product feed pump is connected with the first feed inlet of the n-dimethyl ether tower;
the gas phase port of the n-dimethyl ether tower kettle reboiler is connected with the lateral gas phase port at the bottom of the n-dimethyl ether tower, and the liquid phase port of the n-dimethyl ether tower kettle reboiler is connected with the liquid phase port at the bottom of the n-dimethyl ether tower;
the tower top gas phase port of the n-dimethyl ether tower is connected with the gas phase inlet of the n-dimethyl ether tower condenser;
a condensate sampling port of the n-dimethyl ether tower condenser is connected with a feed port of the n-dimethyl ether condensate intermediate tank;
the discharge port of the intermediate tank of the n-dimethyl ether condensate is connected with the inlet of a reflux pump of the n-dimethyl ether tower;
the outlet of the n-dimethyl ether tower reflux pump is respectively connected with a reflux port at the top of the n-dimethyl ether tower and a feed inlet of the n-dimethyl ether cooler through branch pipelines;
the discharge hole of the n-dimethyl ether cooler is connected with the bottom feed inlet of the n-dimethyl ether intermediate tank;
the liquid phase outlet at the bottom of the n-methyl ether tower is connected with the inlet of the liquid tank of the n-methyl ether tower;
the discharge port of the liquid tank of the dimethyl ether tower kettle is connected with the inlet of a dimethyl ether kettle liquid pump;
an outlet of the orthomethyl ether tower kettle liquid pump is connected with an output pipeline, the output pipeline is connected with subsequent rectification equipment, and an adjusting pipeline is further arranged between the output pipeline and a second feeding hole of the orthomethyl ether tower.
2. The propylene glycol methyl ether rectification and purification system according to claim 1, wherein: and a crude product tower inlet flow meter is arranged on a pipeline between the crude product feeding pump and the first feeding hole of the dimethyl ether tower.
3. The propylene glycol methyl ether rectification and purification system according to claim 1, wherein: and a material tower inlet flow meter is arranged on the adjusting pipeline.
4. The propylene glycol methyl ether rectification and purification system according to claim 1, wherein: and the output pipeline is provided with a sampling port.
5. The propylene glycol methyl ether rectification and purification system according to claim 1, wherein: and the adjusting pipeline is provided with an adjusting valve for controlling the feeding amount of the material in the liquid tank of the dimethyl ether tower entering the dimethyl ether tower.
6. The propylene glycol methyl ether rectification and purification system according to claim 1, wherein: the number of the n-dimethyl ether kettle liquid pumps, the number of the n-dimethyl ether tower reflux pumps and the number of the n-dimethyl ether intermediate tanks are all 2, and the n-dimethyl ether kettle liquid pumps, the n-dimethyl ether tower reflux pumps and the n-dimethyl ether intermediate tanks are arranged in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922044741.0U CN210945433U (en) | 2019-11-25 | 2019-11-25 | Propylene glycol methyl ether rectification purification system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922044741.0U CN210945433U (en) | 2019-11-25 | 2019-11-25 | Propylene glycol methyl ether rectification purification system |
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| Publication Number | Publication Date |
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| CN210945433U true CN210945433U (en) | 2020-07-07 |
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| CN201922044741.0U Active CN210945433U (en) | 2019-11-25 | 2019-11-25 | Propylene glycol methyl ether rectification purification system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114315546A (en) * | 2021-12-18 | 2022-04-12 | 常州锦益辉化工有限公司 | Method for treating waste electron solvent containing water, propylene glycol methyl ether and cyclopentanone |
| CN115784851A (en) * | 2022-10-28 | 2023-03-14 | 南通百川新材料有限公司 | Novel propylene glycol methyl ether rectification production method |
-
2019
- 2019-11-25 CN CN201922044741.0U patent/CN210945433U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114315546A (en) * | 2021-12-18 | 2022-04-12 | 常州锦益辉化工有限公司 | Method for treating waste electron solvent containing water, propylene glycol methyl ether and cyclopentanone |
| CN114315546B (en) * | 2021-12-18 | 2024-01-23 | 张家港市飞翔环保科技有限公司 | Method for treating waste electronic solvent containing water, propylene glycol methyl ether and cyclopentanone |
| CN115784851A (en) * | 2022-10-28 | 2023-03-14 | 南通百川新材料有限公司 | Novel propylene glycol methyl ether rectification production method |
| CN115784851B (en) * | 2022-10-28 | 2024-04-05 | 南通百川新材料有限公司 | Propylene glycol methyl ether rectification production method |
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