CN108947074A - The processing method and its device of formaldehyde waste water in glyphosate production line - Google Patents
The processing method and its device of formaldehyde waste water in glyphosate production line Download PDFInfo
- Publication number
- CN108947074A CN108947074A CN201811009057.2A CN201811009057A CN108947074A CN 108947074 A CN108947074 A CN 108947074A CN 201811009057 A CN201811009057 A CN 201811009057A CN 108947074 A CN108947074 A CN 108947074A
- Authority
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- Prior art keywords
- waste water
- value
- formaldehyde
- glyphosate
- acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 title claims abstract description 114
- XDDAORKBJWWYJS-UHFFFAOYSA-N glyphosate Chemical compound OC(=O)CNCP(O)(O)=O XDDAORKBJWWYJS-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 239000002351 wastewater Substances 0.000 title claims abstract description 34
- 239000005562 Glyphosate Substances 0.000 title claims abstract description 33
- 229940097068 glyphosate Drugs 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000003672 processing method Methods 0.000 title claims abstract description 9
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 67
- 239000002253 acid Substances 0.000 claims abstract description 30
- NKDDWNXOKDWJAK-UHFFFAOYSA-N dimethoxymethane Chemical compound COCOC NKDDWNXOKDWJAK-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000007259 addition reaction Methods 0.000 claims abstract description 5
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims abstract 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 21
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 10
- 239000000047 product Substances 0.000 claims description 8
- 239000006227 byproduct Substances 0.000 claims description 6
- CZHYKKAKFWLGJO-UHFFFAOYSA-N dimethyl phosphite Chemical compound COP([O-])OC CZHYKKAKFWLGJO-UHFFFAOYSA-N 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 230000002194 synthesizing effect Effects 0.000 claims description 2
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 claims 1
- HAXVIVNBOQIMTE-UHFFFAOYSA-L disodium;2-(carboxylatomethylamino)acetate Chemical compound [Na+].[Na+].[O-]C(=O)CNCC([O-])=O HAXVIVNBOQIMTE-UHFFFAOYSA-L 0.000 claims 1
- 239000004615 ingredient Substances 0.000 abstract description 2
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 8
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 8
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 description 5
- NBZBKCUXIYYUSX-UHFFFAOYSA-N iminodiacetic acid Chemical compound OC(=O)CNCC(O)=O NBZBKCUXIYYUSX-UHFFFAOYSA-N 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- DHMQDGOQFOQNFH-UHFFFAOYSA-N Glycine Chemical compound NCC(O)=O DHMQDGOQFOQNFH-UHFFFAOYSA-N 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000005494 condensation Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 239000004471 Glycine Substances 0.000 description 2
- XYFCBTPGUUZFHI-UHFFFAOYSA-N Phosphine Chemical compound P XYFCBTPGUUZFHI-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000002363 herbicidal effect Effects 0.000 description 2
- 239000004009 herbicide Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 239000012452 mother liquor Substances 0.000 description 2
- 239000010413 mother solution Substances 0.000 description 2
- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical compound C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- NEHMKBQYUWJMIP-UHFFFAOYSA-N chloromethane Chemical class ClC NEHMKBQYUWJMIP-UHFFFAOYSA-N 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 231100001231 less toxic Toxicity 0.000 description 1
- 230000003211 malignant effect Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 238000005935 nucleophilic addition reaction Methods 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 229910000073 phosphorus hydride Inorganic materials 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/343—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the pharmaceutical industry, e.g. containing antibiotics
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
The waste water is first introduced rectifying column by the processing method of formaldehyde waste water in glyphosate production line provided by the invention, and methanol solution hair is then added into rectifying column should generate and constantly distill out dimethoxym ethane, reacts the formaldehyde in system sufficiently.Its processing unit has rectifying column and two groups of pH value testers, and the rectifying column has waterwater entrance and acid solution entrance, addition reaction chamber, the dimethoxym ethane gas vent positioned at top, positioned at the outlet of residual night of bottom；First group of pH value tester is arranged in front of waterwater entrance, and second group of pH value tester setting exports rear at residual night.The present invention can convert the formaldehyde fraction in acid waste water to the higher dimethoxym ethane of value, and the ingredient in acid waste water has all obtained effective use, while having saved the cost of processing waste water.
Description
Technical field
The present invention relates to the processing methods of glyphosate waste water.
Background technique
Glyphosate (N- (phosphonomethyl) glycine) is steriland herbicide after the bud of one kind efficiently, less toxic, safe, to more
The prevention and treatment of the deep root malignant weed of year life is very effective, has good bioactivity, belongs to amino acid derivativges, be to apply at present
One of most commonly used herbicide.
Glyphosate production technique mainly has glycine method and iminodiacetic acid (salt) acid system, and glycine method mainly produces at home.
IDA method is the prevailing technology of glyphosate production in the world, which, which is reacted with IDA with formaldehyde, phosphorous acid, is made pmida, then will be double
Sweet phosphine is oxidized to glyphosate, and this method condition is milder, and equipment requirement is not high, and product yield is high, better economic benefit.
In IDA and formaldehyde, phosphorous acid reaction process, in order to keep reaction more thorough, the moisture that reaction generates need to be gone out
System contains a large amount of hydrochloric acid and formaldehyde in the water separated, and the presence of formaldehyde makes the acid water become waste water, and can not recycle makes
With.The byproduct formaldehyde generated during pmida is oxidized to glyphosate is present in glyphosate aqueous mother liquor, which produces
Raw amount is larger, and processing is relatively difficult, and processing cost is high, can not recycle after processing.
In acid waste water, (acid waste water includes that the aldehyde-containing sewage that pmida production generates and glyphosate production produce to the present invention
Raw formaldehyde-containing wastewater) in proper amount of methanol is added, make methanol and formaldehyde that condensation reaction occur and generate dimethoxym ethane, it is existing using our company
Some dimethoxym ethane device of spiral-screen column carry out rectifying to the methanol solution containing dimethoxym ethane, obtain vendible dimethoxym ethane, methanol reuse
Continue condensation with formaldehyde in acid waste water and prepare dimethoxym ethane, obtain except after aldehyde acid waste water be back in glyphosate production and follow
Ring utilizes.
Summary of the invention
Goal of the invention: providing one kind, quickly removal formaldehyde, classification recycle formaldehyde in the glyphosate production line at residual night and give up
The processing method and its device of water.
Technical solution of the present invention:
Reaction principle:
The presence of formaldehyde in glyphosate production wastewater, seriously increases the production cost of glyphosate, constrains its purposes.In order to incite somebody to action
Formaldehyde in the waste water removes, and referring to following reaction, the water-soluble of suitable methanol or methanol is added in oxytropism aldehyde-containing sewage
Liquid (such as crude glycol), formaldehyde and methanol generation nucleophilic addition are converted to dimethoxym ethane under the catalytic action of acid, are made by rectifying
Disengaging system.
In glyphosate production line of the invention in the processing method of formaldehyde waste water, there are following treatment process:
The pH value of the test formaldehyde waste water is introduced into rectifying column when strong acidity is presented lower than setting value in pH value, to
Methanol solution progress addition hair is added in rectifying column should generate dimethoxym ethane, and controls temperature and carry out rectifying operation, distill out first contracting
Aldehyde.
Reacting for dimethoxym ethane can be generated with methanol in acid condition using formaldehyde, will constantly generated during the reaction
Dimethoxym ethane product steam and rectifying separation, promote reaction forward mobile, react the formaldehyde in system sufficiently.
When the pH value of waste water is higher than setting value, and faintly acid is presented, first it is used to absorb exhaust gas or waste liquid containing HCl, then carry out
Addition reaction and rectifying operation.The first pH value tester has the first control of the first signal control line and HCl acid solution entrance at this time
Valve connection simultaneously controls its folding according to the pH value size measured.
Dimethylphosphite is the primary raw material of synthesizing glyphosate, in order to reduce the cost of glyphosate, the applicant enterprise
Also dimethylphosphite is produced, there is two by-products i.e. hydrogen chloride and chloromethanes in dimethylphosphite production process.By chlorination
Hydrogen by-product is separately separated out spare.
1, it is practically free of formaldehyde in the raffinate after steaming dimethoxym ethane and methanol, again passes by pH apparatus measures, when residual night
When pH value is less than setting value presentation strong acidity, after absorbing above-mentioned byproduct hydrogen chloride, as acid and iminodiacetic acid two
Sodium is reacted, and is used to prepare in pmida reaction.
2, when the pH value at residual night is in weak acid or neutrality, direct reuse is in the reaction that pmida oxidation prepares glyphosate.
The second pH value tester has second signal control line to connect with the second control valve that raffinate exports and according to the pH measured at this time
Value size controls its folding.
Present invention has an advantage that
Salable dimethoxym ethane can be converted by the formaldehyde fraction in acid waste water, by sour reuse therein to production pmida
In step, the ingredient in acid waste water has all obtained effective use, acid waste water recoverable.Although consuming part first
Alcohol, but the higher dimethoxym ethane of value is generated, while having saved the cost of processing waste water, reduce security risk.Addition is former
The amount control of material is proper, and formaldehyde almost all is that consumption is used without discharge, and the consumption of methanol and hydrogen chloride can be controlled accurately,
Save Material Cost.Moreover, control unit is simple and efficient, it can be realized the recycling continuous operations of automation.
In the present invention, the control of reaction condition and feeding quantity
Described in above scheme, acid waste water is to produce the aldehyde-containing sewage that pmida and glyphosate process generate, including pmida
Condensation divides water, pmida mother liquor, glyphosate mother solution and its deep or light liquid after UF membrane；
Sour content range 10 ~ 31% in acid waste water, acid are the inorganic and organic acid including hydrogen chloride, formic acid etc.；
The content range 2 ~ 12% of formaldehyde in acid waste water, preferred content are 2 ~ 8%；
Methanol used is absolute alcohol or aqueous crude glycol, wherein content of formaldehyde is 30 ~ 60% in aqueous crude glycol；
Methanol additional amount is 2 ~ 8 times of formaldehyde mole；
Reactive mode is intermittently or serially reactive mode.
Detailed description of the invention
Fig. 1 is a kind of apparatus structure schematic diagram of the invention；
In figure, 1- waterwater entrance；First group of pH value tester of 2-；3- rectifying column and two groups；4- dimethoxym ethane gas vent；5- acid
Liquid entrance；Second group of pH value tester of 6-；The residual night outlet 7-；8- addition reaction chamber；The first signal control line of 10-；20- second believes
Number control line；The first control valve of 50-；The second control valve of 60-.
Specific embodiment
Case study on implementation
1, in the three-necked flask equipped with condenser, investment pmida condensation divides water 200g, and through detection containing acid 16.7%, formaldehyde contains
Amount is 6.8%, and crude carbinol 171.5g is added, and wherein methanol content is 42.3%, is warming up to dimethoxym ethane and first after 50 DEG C of reaction 2h
Alcohol steams, and evaporating content of hydrochloric acid in raffinate is 17.8%, content of formaldehyde 185ppm, and formaldehyde removal rate is 99.7%, methanol content
For 32ppm, it is passed through hydrogen chloride gas into raffinate, finished product hydrochloric acid is made, can be used for the production of pmida and glyphosate, do not influence
Its product yield and quality；
2, in the three-necked flask equipped with condenser, glyphosate mother solution 300g is put into, is 1.05 through detection pH, content of formaldehyde is
2.83%, crude carbinol 119.5g is added, and wherein methanol content is 60.6%, dimethoxym ethane and methanol is steamed after being warming up to 50 DEG C of reaction 3h
Out, evaporation raffinate pH is 0.75, content of formaldehyde 276ppm, and formaldehyde removal rate is 99%, methanol content 44ppm, is given up to raffinate
It is passed through hydrogen chloride gas in water, finished product hydrochloric acid is made, direct reuse and glyphosate production do not influence its product yield and quality.
Claims (6)
1. the processing method of formaldehyde waste water in a kind of glyphosate production line, it is characterised in that: have following treatment process:
1) waste water is introduced into rectifying column；
2) methanol solution progress addition hair is added into rectifying column should generate dimethoxym ethane, and controls temperature and carry out rectifying operation, steam
Distillate dimethoxym ethane；
3) the dimethoxym ethane product of generation is constantly steamed during the reaction and rectifying separates, promoted reaction forward mobile, make
Formaldehyde in system sufficiently reacts.
2. the processing method of formaldehyde waste water in glyphosate production line as described in claim 1, it is characterised in that:
Treatment process 1) before, the pH value of the formaldehyde waste water is first tested, when strong acidity is presented lower than setting value in pH value,
It is introduced directly into rectifying column；
When pH value is higher than setting value, and faintly acid is presented, first in the raw material dimethylphosphite production for absorbing synthesizing glyphosate
The by-product HCl exhaust gas or addition hydrochloric acid acid solution of generation, then carry out addition reaction and rectifying operation.
3. the processing method of formaldehyde waste water in glyphosate production line as described in claim 1, it is characterised in that: steam dimethoxym ethane
With the raffinate after methanol, pH apparatus measures are again passed by, when the pH value at residual night is less than setting value, and strong acidity is presented, through absorbing
After above-mentioned by-product HCl exhaust gas, reacted as acid with Iminodiacetic acid sodium salt, be used to prepare production glyphosate partly at
Product pmida；
When the pH value at residual night is in weak acid or neutrality, direct reuse is in the reaction that pmida oxidation prepares glyphosate.
4. the processing unit of formaldehyde waste water in a kind of glyphosate production line, it is characterised in that: use processing described in claim 1
Method has rectifying column and two groups of pH value testers, and the rectifying column has waterwater entrance and acid solution entrance, has and is located at it
The addition reaction chamber of lower inside, the dimethoxym ethane gas vent positioned at top, the outlet of the residual night positioned at bottom；First group of pH value is surveyed
It tries instrument to be arranged in front of waterwater entrance, second group of pH value tester setting exports rear at residual night.
5. the processing unit of formaldehyde waste water in glyphosate production line as claimed in claim 4, it is characterised in that: the first pH value is surveyed
Examination instrument has the first signal control line to connect with the first control valve of HCl acid solution entrance and controls its folding.
6. the processing unit of formaldehyde waste water in glyphosate production line as described in claim 4 or 5, it is characterised in that: the 2nd pH
Value tester has second signal control line to connect with the second control valve that raffinate exports and controls its folding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811009057.2A CN108947074A (en) | 2018-08-31 | 2018-08-31 | The processing method and its device of formaldehyde waste water in glyphosate production line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811009057.2A CN108947074A (en) | 2018-08-31 | 2018-08-31 | The processing method and its device of formaldehyde waste water in glyphosate production line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108947074A true CN108947074A (en) | 2018-12-07 |
Family
ID=64475127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811009057.2A Pending CN108947074A (en) | 2018-08-31 | 2018-08-31 | The processing method and its device of formaldehyde waste water in glyphosate production line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108947074A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006025355A1 (en) * | 2004-08-31 | 2006-03-09 | Kyowa Hakko Kogyo Co., Ltd. | Rectification apparatus and method of rectification with the same |
| CN1807378A (en) * | 2006-01-26 | 2006-07-26 | 南京师范大学 | Method for preparing methylal using combined continuous distillation and liquid-liquid extraction |
| CN101695647A (en) * | 2009-10-29 | 2010-04-21 | 天津大学 | Device and method for intermittent esterification reaction rectification with acidity control |
| CN203112793U (en) * | 2013-01-30 | 2013-08-07 | 河北隆海生物科技有限公司 | Special device for treating acid-base property of methanol in production process of biodiesel fuel |
| CN208964722U (en) * | 2018-08-31 | 2019-06-11 | 南通江山农药化工股份有限公司 | The processing unit of formaldehyde waste water in glyphosate production line |
-
2018
- 2018-08-31 CN CN201811009057.2A patent/CN108947074A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006025355A1 (en) * | 2004-08-31 | 2006-03-09 | Kyowa Hakko Kogyo Co., Ltd. | Rectification apparatus and method of rectification with the same |
| CN1807378A (en) * | 2006-01-26 | 2006-07-26 | 南京师范大学 | Method for preparing methylal using combined continuous distillation and liquid-liquid extraction |
| CN101695647A (en) * | 2009-10-29 | 2010-04-21 | 天津大学 | Device and method for intermittent esterification reaction rectification with acidity control |
| CN203112793U (en) * | 2013-01-30 | 2013-08-07 | 河北隆海生物科技有限公司 | Special device for treating acid-base property of methanol in production process of biodiesel fuel |
| CN208964722U (en) * | 2018-08-31 | 2019-06-11 | 南通江山农药化工股份有限公司 | The processing unit of formaldehyde waste water in glyphosate production line |
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Application publication date: 20181207 |
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