CN112110793A - Process for extracting mixed alcohol from light component at top of high-concentration wastewater pretreatment rectifying tower - Google Patents
Process for extracting mixed alcohol from light component at top of high-concentration wastewater pretreatment rectifying tower Download PDFInfo
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- CN112110793A CN112110793A CN202010918141.7A CN202010918141A CN112110793A CN 112110793 A CN112110793 A CN 112110793A CN 202010918141 A CN202010918141 A CN 202010918141A CN 112110793 A CN112110793 A CN 112110793A
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- alcohol
- mixture
- concentration wastewater
- distillation
- wastewater pretreatment
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 239000002351 wastewater Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000004821 distillation Methods 0.000 claims abstract description 44
- 239000003208 petroleum Substances 0.000 claims abstract description 42
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 40
- 238000000605 extraction Methods 0.000 claims abstract description 32
- 239000003513 alkali Substances 0.000 claims abstract description 13
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 80
- ATHHXGZTWNVVOU-UHFFFAOYSA-N N-methylformamide Chemical compound CNC=O ATHHXGZTWNVVOU-UHFFFAOYSA-N 0.000 claims description 49
- 239000000203 mixture Substances 0.000 claims description 47
- 239000007788 liquid Substances 0.000 claims description 38
- 238000003756 stirring Methods 0.000 claims description 35
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 33
- 238000005086 pumping Methods 0.000 claims description 22
- 150000001298 alcohols Chemical class 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 238000001704 evaporation Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 239000002994 raw material Substances 0.000 abstract description 5
- 239000000284 extract Substances 0.000 abstract description 3
- 239000000446 fuel Substances 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 238000004065 wastewater treatment Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000003795 chemical substances by application Substances 0.000 description 7
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000005191 phase separation Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- -1 carbon alcohols Chemical class 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- ZXEKIIBDNHEJCQ-UHFFFAOYSA-N isobutanol Chemical compound CC(C)CO ZXEKIIBDNHEJCQ-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 150000007524 organic acids Chemical class 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000001577 simple distillation Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- ATHHXGZTWNVVOU-VQEHIDDOSA-N n-methylformamide Chemical group CN[13CH]=O ATHHXGZTWNVVOU-VQEHIDDOSA-N 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C231/00—Preparation of carboxylic acid amides
- C07C231/22—Separation; Purification; Stabilisation; Use of additives
- C07C231/24—Separation; Purification
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/26—Treatment of water, waste water, or sewage by extraction
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Extraction Or Liquid Replacement (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention relates to the technical field of wastewater treatment, and provides a process for extracting mixed alcohol from light components at the top of a high-concentration wastewater pretreatment rectifying tower, which comprises the following steps: (1) alkali treatment; (2) primary extraction and distillation; (3) and (5) secondary extraction and distillation. The method solves the problem that the prior art can not separate and extract the low-carbon mixed alcohol from the high-concentration wastewater, and the recovered low-carbon alcohol can be used as a raw material for producing chemical products and a clean fuel for replacing petroleum.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a process for extracting mixed alcohol from light components at the top of a high-concentration wastewater pretreatment rectifying tower.
Background
In the modern fine chemical industry, various esterification reactions, surfactant production and the like all use alcohols and ester products as raw materials, so that high-concentration wastewater rich in organic matters is inevitably generated, and production raw materials or intermediate products such as alcohols and the like which cannot be completely recycled at present are carried in the process wastewater. However, in the past, the high-concentration wastewater is collected and then sent to a sewage treatment plant for simple treatment, which not only costs high sewage treatment cost, but also wastes recyclable materials in the water body. And no effective method exists at present for recovering the low-carbon alcohol from the water body. The common water treatment device carries out distillation treatment on the wastewater containing the low-carbon alcohol, and the low-carbon alcohol and water can form an azeotrope, so that the distilled liquid contains a large amount of water, the low-carbon alcohol is difficult to separate and extract from the distilled liquid, the waste is changed into valuable, and the water treatment device is used as a raw material for producing chemical products and a clean fuel for replacing petroleum.
The applicant researches this kind of high concentration waste water carefully, and finds that the mixed liquid ejected from the high concentration waste water pretreatment rectifying tower contains a large amount of C2-C4 low carbon alcohols, such as ethanol, propanol, isopropanol, isobutanol, etc., and these low carbon alcohols are valuable chemical raw materials and high quality alcohol fuels after being recovered.
Disclosure of Invention
Therefore, aiming at the content, the invention provides a process for extracting mixed alcohol from light components at the top of a rectification tower for pretreating high-concentration wastewater, and solves the problem that the low-carbon mixed alcohol cannot be separated and extracted from the high-concentration wastewater in the prior art.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the process of extracting mixed alcohol from light component in the top of rectifying tower of high concentration waste water includes the following steps:
s1, alkali treatment:
sending the mixed liquid obtained from the top of the high-concentration wastewater pretreatment rectifying tower into a mixing kettle, adding sodium hydroxide solid accounting for 0.2-0.5% of the mass of the mixed liquid, stirring for 60-150 min, sampling and detecting the pH value of the mixed liquid in the mixing kettle, wherein the pH value is within the range of 7.0-7.5, and if the pH value is detected to be below 7.0, continuously adding the sodium hydroxide solid;
s2, primary extraction and distillation
Pumping the mixed liquid after the alkali treatment into a first extraction kettle, adding a first extractant petroleum ether under the stirring state, stirring for 30min, heating, and distilling to obtain a mixture of petroleum ether and lower alcohol;
s3, secondary extraction and distillation
Pumping the mixture of the petroleum ether and the low-carbon alcohol obtained in the step into a second extraction kettle, adding a second extractant N-methylformamide in a stirring state, stopping stirring after stirring for 60-90 min, pumping the mixture into a settling tank for natural settling and phase splitting, wherein the lower layer of liquid is the mixture of the N-methylformamide and the low-carbon alcohol, and the upper layer is the mixture of the petroleum ether for recycling;
pumping the mixture of N-methylformamide and low-carbon alcohol into a distillation still for distillation, and evaporating and condensing the mixed alcohol in the mixture to realize separation and extraction.
The further improvement is that: the addition amount of the petroleum ether in the S2 is 25-60% of the mass of the mixed liquid.
The further improvement is that: the addition amount of the N-methylformamide in the S3 is 25-60% of the mass of the mixture of the petroleum ether and the lower alcohol.
The further improvement is that: the addition amount of the N-methylformamide in the S3 is 35-50% of the mass of the mixture of the petroleum ether and the lower alcohol.
The further improvement is that: frame-type slurry is adopted for stirring, and the rotating speed is not more than 80 r/min.
The further improvement is that: the distillation temperature in S2 is controlled within 100 ℃.
The further improvement is that: the distillation temperature in S3 is controlled within 120 ℃.
The further improvement is that: and (3) filtering visible impurities out of the mixed liquid after the alkali treatment of S1 through a stainless steel filter screen of 150 meshes before pumping the mixed liquid into the first extraction kettle.
The further improvement is that: the lower alcohol is a saturated monohydric alcohol mixture with the carbon number of 2-4.
The further improvement is that: in the low-carbon alcohol, the mass ratio of ethanol is 15-25%, the mass ratio of C3 alcohol is 35-45%, and the mass ratio of C4 alcohol is 35-45%.
By adopting the technical scheme, the invention has the beneficial effects that:
the invention separates and extracts low-carbon mixed alcohol from light components at the top of the rectification tower pretreated by high-concentration wastewater in a secondary extraction mode. The petroleum ether is used as an extracting agent for the first extraction, most of the low-carbon alcohol is extracted from the water by utilizing the characteristic that the petroleum ether is dissolved in the low-carbon alcohol but is not dissolved in the water, and the condition that the low-carbon alcohol and the water form an azeotrope is destroyed due to the addition of the petroleum ether, so that the moisture carried in the distillation process is greatly reduced, and the separation of the water and the low-carbon alcohol is realized.
The mixture of the petroleum ether and the lower alcohol is obtained by the first extraction and distillation, but the distillation ranges of the petroleum ether and the lower alcohol are relatively close, and the common distillation method is difficult to realize, so the invention adopts a second extraction and distillation mode, selects a second extracting agent which can dissolve the lower alcohol but not the petroleum ether and has high boiling point, separates the lower alcohol from the mixture, and finally separates the lower alcohol from the second extracting agent by simple distillation. Through a large number of tests, the second extracting agent is N-methylformamide.
During secondary extraction, the lower alcohol and the petroleum ether in the mixture are separated in a natural sedimentation mode, and the petroleum ether can be recycled. And after secondary extraction, separating the N-methylformamide from the lower alcohol by simple distillation, and recycling the N-methylformamide.
The mixed liquid obtained from the top of the high-concentration wastewater pretreatment rectifying tower contains a small amount of organic acid, sodium hydroxide is added to remove the organic acid, and the pH value is controlled to be 7.0-7.5. Then filtering to remove visible mechanical impurities, and preventing impurities from depositing in the equipment, so that the pipeline is blocked or the running equipment is worn.
Detailed Description
The following detailed description will be provided for the embodiments of the present invention with reference to specific embodiments, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and appreciated
And (5) implementing.
Unless otherwise indicated, the techniques employed in the examples are conventional and well known to those skilled in the art, and the reagents and products employed are also commercially available. The source, trade name and if necessary the constituents of the reagents used are indicated at the first appearance.
Example one
The process of extracting mixed alcohol from light component in the top of rectifying tower of high concentration waste water includes the following steps:
s1, alkali treatment:
sending the mixed liquid obtained from the top of the high-concentration wastewater pretreatment rectifying tower into a mixing kettle, adding sodium hydroxide solid accounting for 0.2% of the mass of the mixed liquid, stirring for 60min, sampling and detecting the pH value of the mixed liquid in the mixing kettle, filtering and removing visible impurities through a 150-mesh stainless steel filter screen when the pH value is within the range of 7.0-7.5, and continuously adding the sodium hydroxide solid if the pH value is detected to be below 7.0;
s2, primary extraction and distillation
Pumping the mixed liquid after the alkali treatment into a first extraction kettle, adding a first extracting agent petroleum ether under the stirring state, wherein the addition amount of the petroleum ether is 25% of the mass of the mixed liquid, stirring for 30min, then heating, distilling, and obtaining a mixture of the petroleum ether and low carbon alcohol, wherein the distillation temperature is 90 ℃;
s3, secondary extraction and distillation
Pumping the mixture of the petroleum ether and the low-carbon alcohol obtained in the step into a second extraction kettle, adding a second extractant N-methylformamide in a stirring state, wherein the addition amount of the N-methylformamide is 30% of the mass of the mixture of the petroleum ether and the low-carbon alcohol, stopping stirring after stirring for 60min, pumping the mixture into a settling tank for natural settling and phase separation, wherein the lower layer liquid is the mixture of the N-methylformamide and the low-carbon alcohol, and the upper layer is the mixture of the petroleum ether for recycling;
pumping the mixture of N-methylformamide and lower alcohol into a distillation still for distillation at the temperature of
And (3) separating and extracting the low-carbon alcohol in the mixture through evaporation and condensation at 120 ℃.
Frame-type slurry is adopted for stirring in the whole process, and the rotating speed is not more than 80 r/min. The rotation speed of the present embodiment is 60 r/min.
Example two
The process of extracting mixed alcohol from light component in the top of rectifying tower of high concentration waste water includes the following steps:
s1, alkali treatment:
sending the mixed liquid obtained from the top of the high-concentration wastewater pretreatment rectifying tower into a mixing kettle, adding sodium hydroxide solid accounting for 0.4% of the mass of the mixed liquid, stirring for 100min, sampling and detecting the pH value of the mixed liquid in the mixing kettle, filtering and removing visible impurities through a 150-mesh stainless steel filter screen when the pH value is within the range of 7.0-7.5, and continuously adding the sodium hydroxide solid if the pH value is detected to be below 7.0;
s2, primary extraction and distillation
Pumping the mixed liquid after the alkali treatment into a first extraction kettle, adding a first extracting agent petroleum ether under the stirring state, wherein the addition amount of the petroleum ether is 40% of the mass of the mixed liquid, stirring for 30min, then heating, distilling, and obtaining a mixture of the petroleum ether and low carbon alcohol, wherein the distillation temperature is 90 ℃;
s3, secondary extraction and distillation
Pumping the mixture of the petroleum ether and the low-carbon alcohol obtained in the step into a second extraction kettle, adding a second extractant N-methylformamide in a stirring state, wherein the addition amount of the N-methylformamide is 45% of the mass of the mixture of the petroleum ether and the low-carbon alcohol, stopping stirring after stirring for 75min, pumping the mixture into a settling tank for natural settling and phase separation, wherein the lower layer liquid is the mixture of the N-methylformamide and the low-carbon alcohol, and the upper layer is the mixture of the petroleum ether for recycling;
pumping the mixture of N-methylformamide and lower alcohol into a distillation still for distillation at the temperature of
And (3) separating and extracting the low-carbon alcohol in the mixture through evaporation and condensation at 120 ℃.
In the whole process, frame-type slurry is adopted for stirring, and the rotating speed is 70 r/min.
EXAMPLE III
The process of extracting mixed alcohol from light component in the top of rectifying tower of high concentration waste water includes the following steps:
s1, alkali treatment:
sending the mixed liquid obtained from the top of the high-concentration wastewater pretreatment rectifying tower into a mixing kettle, adding sodium hydroxide solid accounting for 0.5% of the mass of the mixed liquid, stirring for 150min, sampling and detecting the pH value of the mixed liquid in the mixing kettle, filtering and removing visible impurities through a 150-mesh stainless steel filter screen when the pH value is within the range of 7.0-7.5, and continuously adding the sodium hydroxide solid if the pH value is detected to be below 7.0;
s2, primary extraction and distillation
Pumping the mixed liquid after the alkali treatment into a first extraction kettle, adding a first extracting agent petroleum ether under the stirring state, wherein the addition amount of the petroleum ether is 60% of the mass of the mixed liquid, stirring for 30min, then heating, distilling, and obtaining a mixture of the petroleum ether and low carbon alcohol, wherein the distillation temperature is 90 ℃;
s3, secondary extraction and distillation
Pumping the mixture of the petroleum ether and the low-carbon alcohol obtained in the step into a second extraction kettle, adding a second extractant N-methylformamide in a stirring state, wherein the addition amount of the N-methylformamide is 60% of the mass of the mixture of the petroleum ether and the low-carbon alcohol, stopping stirring after stirring for 90min, pumping the mixture into a settling tank for natural settling and phase separation, wherein the lower layer liquid is the mixture of the N-methylformamide and the low-carbon alcohol, and the upper layer is the mixture of the petroleum ether for recycling;
pumping the mixture of N-methylformamide and lower alcohol into a distillation still for distillation at the temperature of
And (3) separating and extracting the low-carbon alcohol in the mixture through evaporation and condensation at 120 ℃.
In the whole process, frame-type slurry is adopted for stirring, and the rotating speed is 80 r/min.
The above description is only an embodiment utilizing the technical content of the present disclosure, and any modification and variation made by those skilled in the art can be covered by the claims of the present disclosure, and not limited to the embodiments disclosed.
Claims (10)
1. The process for extracting the mixed alcohol from the light component at the top of the high-concentration wastewater pretreatment rectifying tower is characterized by comprising the following steps of: the method comprises the following steps:
s1, alkali treatment:
sending the mixed liquid obtained from the top of the high-concentration wastewater pretreatment rectifying tower into a mixing kettle, adding sodium hydroxide solid accounting for 0.2-0.5% of the mass of the mixed liquid, stirring for 60-150 min, sampling and detecting the pH value of the mixed liquid in the mixing kettle, wherein the pH value is within the range of 7.0-7.5, and if the pH value is detected to be below 7.0, continuously adding the sodium hydroxide solid;
s2, primary extraction and distillation
Pumping the mixed liquid after the alkali treatment into a first extraction kettle, adding a first extractant petroleum ether under the stirring state, stirring for 30min, heating, and distilling to obtain a mixture of petroleum ether and lower alcohol;
s3, secondary extraction and distillation
Pumping the mixture of the petroleum ether and the low-carbon alcohol obtained in the step into a second extraction kettle, adding a second extractant N-methylformamide in a stirring state, stopping stirring after stirring for 60-90 min, pumping the mixture into a settling tank for natural settling and phase splitting, wherein the lower layer of liquid is the mixture of the N-methylformamide and the low-carbon alcohol, and the upper layer is the mixture of the petroleum ether for recycling;
pumping the mixture of the N-methylformamide and the low-carbon alcohol into a distillation still for distillation, and evaporating and condensing the low-carbon alcohol in the mixture to realize separation and extraction.
2. The process of claim 1 for extracting mixed alcohols from the light components at the top of a high concentration wastewater pretreatment distillation tower, wherein: the addition amount of the petroleum ether in the S2 is 25-60% of the mass of the mixed liquid.
3. The process of claim 1 for extracting mixed alcohols from the light components at the top of a high concentration wastewater pretreatment distillation tower, wherein: the addition amount of the N-methylformamide in the S3 is 25-60% of the mass of the mixture of the petroleum ether and the lower alcohol.
4. The process of claim 3 for extracting mixed alcohols from the light components at the top of the high concentration wastewater pretreatment distillation tower, wherein the process comprises the following steps: the addition amount of the N-methylformamide in the S3 is 35-50% of the mass of the mixture of the petroleum ether and the lower alcohol.
5. The process of claim 1 for extracting mixed alcohols from the light components at the top of a high concentration wastewater pretreatment distillation tower, wherein: frame-type slurry is adopted for stirring, and the rotating speed is not more than 80 r/min.
6. The process of claim 1 for extracting mixed alcohols from the light components at the top of a high concentration wastewater pretreatment distillation tower, wherein: the distillation temperature in S2 is controlled within 100 ℃.
7. The process of claim 1 for extracting mixed alcohols from the light components at the top of a high concentration wastewater pretreatment distillation tower, wherein: the distillation temperature in S3 is controlled within 120 ℃.
8. The process of claim 1 for extracting mixed alcohols from the light components at the top of a high concentration wastewater pretreatment distillation tower, wherein: and (3) filtering visible impurities out of the mixed liquid after the alkali treatment of S1 through a stainless steel filter screen of 150 meshes before pumping the mixed liquid into the first extraction kettle.
9. The process of claim 1 for extracting mixed alcohols from the light components at the top of a high concentration wastewater pretreatment distillation tower, wherein: the lower alcohol is a saturated monohydric alcohol mixture with the carbon number of 2-4.
10. The process of claim 9 for extracting mixed alcohols from the light components at the top of a high concentration wastewater pretreatment distillation column, wherein: in the low-carbon alcohol, the mass ratio of ethanol is 15-25%, the mass ratio of C3 alcohol is 35-45%, and the mass ratio of C4 alcohol is 35-45%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113816832A (en) * | 2021-10-29 | 2021-12-21 | 山东京博石油化工有限公司 | Treatment method of mixed waste solvent |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1525142A (en) * | 1975-08-06 | 1978-09-20 | Mcdonnell R | Ostomy appliance |
| CN111377801A (en) * | 2018-12-28 | 2020-07-07 | 国家能源投资集团有限责任公司 | Method and system for refining low carbon alcohol |
-
2020
- 2020-09-03 CN CN202010918141.7A patent/CN112110793A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1525142A (en) * | 1975-08-06 | 1978-09-20 | Mcdonnell R | Ostomy appliance |
| CN111377801A (en) * | 2018-12-28 | 2020-07-07 | 国家能源投资集团有限责任公司 | Method and system for refining low carbon alcohol |
Non-Patent Citations (1)
| Title |
|---|
| 曾郴林等: "《工业废水处理工程设计实例》", 31 January 2017, 中国环境出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113816832A (en) * | 2021-10-29 | 2021-12-21 | 山东京博石油化工有限公司 | Treatment method of mixed waste solvent |
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Application publication date: 20201222 |