CN208964722U - The processing unit of formaldehyde waste water in glyphosate production line - Google Patents
The processing unit of formaldehyde waste water in glyphosate production line Download PDFInfo
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Abstract
The utility model provides a kind of processing unit of formaldehyde waste water in glyphosate production line, and waste water is introduced rectifying column, 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 utility model 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 utility model relates to the processing equipments 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.
Summary of the invention
Purpose of utility model: providing one kind, quickly removal formaldehyde, classification recycle first in the glyphosate production line of raffinate
The processing unit of aldehyde waste water.
Technical solution:
In acid waste water, (acid waste water includes that the aldehyde-containing sewage that pmida production generates and glyphosate are raw to the utility model
The formaldehyde-containing wastewater generated) in proper amount of methanol is added, make methanol and formaldehyde that condensation reaction occur and generate dimethoxym ethane, utilize this public affairs
Existing dimethoxym ethane device of spiral-screen column is taken charge of, rectifying is carried out to the methanol solution containing dimethoxym ethane, obtains vendible dimethoxym ethane, methanol
Be back in acid waste water and continue condensation with formaldehyde and prepare dimethoxym ethane, obtain except after aldehyde acid waste water be back to glyphosate production
In recycle.
The utility model has rectifying column and two groups of pH value testers, and there is the rectifying column waterwater entrance and acid solution to enter
Mouthful, addition reaction chamber, the dimethoxym ethane gas vent positioned at top, the raffinate positioned at bottom with lower section on its interior go out
Mouthful；First group of pH value tester is arranged in front of waterwater entrance, and second group of pH value tester setting exports rear in raffinate.
Reaction principle:
The presence of formaldehyde in glyphosate production wastewater, seriously increases the production cost of glyphosate, constrains its purposes.For
Formaldehyde in the waste water is removed, referring to following reaction, suitable methanol or methanol are added in oxytropism aldehyde-containing sewage
Aqueous solution (such as crude glycol), formaldehyde and methanol generation nucleophilic addition are converted to dimethoxym ethane under the catalytic action of acid, pass through essence
It evaporates and is allowed to be detached from system.
When strong acidity is presented lower than setting value in pH value, it is introduced into rectifying column, methanol solution is added into rectifying column
Dimethoxym ethane should be generated by carrying out addition hair, and is controlled temperature and carried out rectifying operation, and dimethoxym ethane is distilled out.
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 pH value is higher than setting value, and faintly acid is presented, first for absorbing exhaust gas or waste liquid containing HCl, then to carry out addition anti-
It should be with rectifying operation.The first pH value tester has the first control valve of the first signal control line and HCl acid solution entrance to connect at this time
It connects and its folding is controlled 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, pH apparatus measures are again passed by, when raffinate
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 of raffinate 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.
The advantage of the utility model is, can convert the formaldehyde fraction in acid waste water to salable dimethoxym ethane, will
In the step of acid reuse therein to production pmida, the ingredient in acid waste water has all obtained effective use, and acid waste water can
It recycles.Although consuming part methanol, generate the higher dimethoxym ethane of value, at the same saved processing waste water at
This, reduces security risk.
Detailed description of the invention
Fig. 1 is a kind of apparatus structure schematic diagram of the utility model；
In figure, 3- rectifying column；First group of pH value tester of 2-；1- waterwater entrance；5- acid solution entrance；8- addition reaction chamber；
4- dimethoxym ethane gas vent；The outlet of 7- raffinate；Second group of pH value tester of 6-.
Specific embodiment
The processing unit of formaldehyde waste water in glyphosate production line as shown in Figure 1 has rectifying column and two groups of pH value tests
Instrument, the rectifying column have waterwater entrance and acid solution entrance, have the addition reaction chamber of lower section on its interior, are located at top
Dimethoxym ethane gas vent, positioned at bottom raffinate export；First group of pH value tester is arranged in front of waterwater entrance, and second group
The setting of pH value tester exports rear in raffinate.
Embodiment 1:
In the three-necked flask equipped with condenser, investment pmida condensation divides water 200g, through detection containing acid 16.7%, formaldehyde
Content is 6.8%, and crude carbinol 171.5g is added, and wherein methanol content is 42.3%, be warming up to after 50 DEG C of reaction 2h by dimethoxym ethane with
Methanol steams, and evaporating content of hydrochloric acid in raffinate is 17.8%, content of formaldehyde 185ppm, and formaldehyde removal rate is 99.7%, and methanol contains
Amount is 32ppm, hydrogen chloride gas is passed through into raffinate, finished product hydrochloric acid is made, can be used for the production of pmida and glyphosate, not shadow
Ring its product yield and quality.
Embodiment 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
Be passed through hydrogen chloride gas in water and be made finished product hydrochloric acid, in direct reuse and glyphosate production system, do not influence its product yield and
Quality.
Claims (4)
1. the processing unit of formaldehyde waste water in a kind of glyphosate production line, it is characterised in that: have rectifying column and two groups of pH value to survey
Instrument is tried, the rectifying column has waterwater entrance and acid solution entrance, has the addition reaction chamber of lower section on its interior, is located at top
The dimethoxym ethane gas vent in portion, the raffinate positioned at bottom export；First group of pH value tester is arranged in front of waterwater entrance, and second
The setting of group pH value tester exports rear in raffinate.
2. the processing unit of formaldehyde waste water in glyphosate production line as described in claim 1, it is characterised in that: raffinate outlet
In the reaction system that after pH value tester there is pipeline connection to prepare glyphosate to pmida oxidation.
3. the processing unit of formaldehyde waste water in glyphosate production line as described in claim 1, 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.
4. the processing unit of formaldehyde waste water in glyphosate production line as claimed in claim 1 or 3, 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 |
|---|---|---|---|
| CN201821420080.6U CN208964722U (en) | 2018-08-31 | 2018-08-31 | The processing unit of formaldehyde waste water in glyphosate production line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821420080.6U CN208964722U (en) | 2018-08-31 | 2018-08-31 | The processing unit of formaldehyde waste water in glyphosate production line |
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| CN208964722U true CN208964722U (en) | 2019-06-11 |
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| CN201821420080.6U Active CN208964722U (en) | 2018-08-31 | 2018-08-31 | The processing unit of formaldehyde waste water in glyphosate production line |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108947074A (en) * | 2018-08-31 | 2018-12-07 | 南通江山农药化工股份有限公司 | The processing method and its device of formaldehyde waste water in glyphosate production line |
-
2018
- 2018-08-31 CN CN201821420080.6U patent/CN208964722U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108947074A (en) * | 2018-08-31 | 2018-12-07 | 南通江山农药化工股份有限公司 | The processing method and its device of formaldehyde waste water in glyphosate production line |
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