CN1935788A - Method for preparing ziram - Google Patents
Method for preparing ziram Download PDFInfo
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- CN1935788A CN1935788A CN 200610048400 CN200610048400A CN1935788A CN 1935788 A CN1935788 A CN 1935788A CN 200610048400 CN200610048400 CN 200610048400 CN 200610048400 A CN200610048400 A CN 200610048400A CN 1935788 A CN1935788 A CN 1935788A
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- CN
- China
- Prior art keywords
- ziram
- dimethylamine
- retort
- preparation
- zinc oxide
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Abstract
The invention belongs to pesticide technical field, especially relating to a high-performance, low-toxicity Fuklasin preparing method, and its main technical solution comprises: adding dimethylamine and ZnO in a reacting cylinder, adding in CS2 while blending and reacting fully, discharging the liquid from the reacting cylinder, and then water-washing, dewatering and airflow-drying the resultant solid matter to be able to make Fuklasin. And it has advantages of simple producing process and mechanism, low moisture content of Fuklasin, high Fuklasin yield, and low producing cost, and besides, is an environmental-protection process.
Description
Technical field
The invention belongs to technical field of pesticide, relate in particular to a kind of preparation method efficient, hypotoxicity agricultural chemicals ziram that has.
Background technology
Ziram (Ziram) is a kind of low toxicity wide-spectrum bactericide, belongs to low-toxin farm chemicals, is widely used in the control of vegetables, fruit tree, flowers and food crop disease and pest.But the production technique of producing ziram at present and being adopted is: at first utilize the reaction of dimethylamine and dithiocarbonic anhydride and caustic soda to generate Sodium Dimethyldithiocarbamate, utilize the Sodium Dimethyldithiocarbamate and the zinc sulfate reaction that are generated to obtain ziram again.Its reaction formula is:
(CH
3)
2NH+CS
2+NaOH→(CH
3)
2N-CSSNa+H
2O
2(CH
3)
2N-CSSNa+ZnSO
4→[(CH
3)
2N-CSS]
2Zn+Na
2So
4
Utilize above-mentioned reaction to produce ziram,, in process of production, not only need the reactor device of many covers, but also need purchase four kinds of raw materials, in reaction process, still have a large amount of waste water and sodium sulfate byproduct to need to handle although reaction mechanism is simple.The ziram that is generated in this production technique is because for the higher paste of water content, directly enters drying baker and dehydrates the moisture of formed ziram product and reach more than 3%.Therefore, utilize the ziram of above-mentioned explained hereafter to exist the defective of water ratio height, production cost height and complex process.In addition, the yield of above-mentioned explained hereafter ziram only is 85 left and right sides %.
Summary of the invention
Purpose of the present invention just provides the preparation method of the ziram that a kind of production mechanism is simple, water ratio is low, production cost is low and yield is high.
The technical scheme that realizes the object of the invention is:
A kind of preparation method of ziram comprises the following steps:
At first add dimethylamine and zinc oxide in retort, constantly stir, and adding dithiocarbonic anhydride reacts in this retort, its reaction mechanism is:
2(CH
3)
2NH+2CS
2+ZnO→[(CH
3)
2N-CSS]
2Zn+H
2O
After dimethylamine, zinc oxide and dithiocarbonic anhydride fully react, the liquid in the retort to be discharged, the solids that will react generation again can make ziram through after washing, dehydration and the air stream drying operation.
Its additional technical feature is:
The described dimethylamine that adds in retort is through the aqueous solution after the water dissolution;
The described temperature that adds entry, dimethylamine and zinc oxide reaction in retort is controlled between 30-80 ℃;
The described temperature that adds entry, dimethylamine and zinc oxide reaction in retort is controlled between 35-45 ℃;
Adding the mode that adds dithiocarbonic anhydride in entry, dimethylamine and the zinc oxide reaction process in described retort is added dropwise to for the discontinuous point;
The time that described dimethylamine, zinc oxide and dithiocarbonic anhydride fully react is no less than 2 hours;
The airflow inlet temperature of described air stream drying operation is 100-110 ℃, and temperature out is 70-90 ℃.
The preparation method of a kind of ziram provided by the present invention compared with prior art, have the following advantages: one, because the preparation method of this ziram only adopts dimethylamine, dithiocarbonic anhydride and zinc oxide and water single step reaction in a reactor can make ziram, simplify production technique, had the simple advantage of production mechanism; Its two owing to saved producing of Sodium Dimethyldithiocarbamate in production technique, the reaction of having saved caustic soda has reduced the discharging and the processing of sodium sulfate again, has reduced production cost, so this technology is a kind of environmental-protection process; Its three owing to utilize the explained hereafter ziram can convection drying, its water ratio can reach below 0.5%, the yield of preparation ziram reaches 93-98%, has the high advantage of yield.
Embodiment
Below in conjunction with embodiment the preparation method of a kind of ziram provided by the present invention is described in further detail:
The concentration that at first adds 805 kilograms in retort is 40% dimethylamine agueous solution and 290 kilograms zinc oxide, in the process that adds and constantly, stir, be interrupted the dithiocarbonic anhydride that splashes into 155 kilograms when stirring and react in this retort, the time of reaction remained on 2.5 hours.When splashing into dithiocarbonic anhydride, the temperature of reaction of solution is between 30-35 ℃ in the control retort, and its reaction mechanism is:
2(CH
3)
2NH+2CS
2+ZnO→[(CH
3)
2N-CSS]
2Zn+H
2O
After dimethylamine, zinc oxide and dithiocarbonic anhydride fully react, with contain in the retort that unreacted dithiocarbonic anhydride and water constitutes liquid discharge, to react again the solids that generates through washing, centrifuge dewatering after, it is 100 ℃ through inlet temperature again, temperature out is after 90 ℃ the air stream drying operation, can make the former powder content of ziram is 95%, and moisture is no more than 1040 kilograms of 0.5% ziram products, and its yield (in zinc oxide) reaches 96%.
In the technology of above-mentioned preparation ziram, in retort, add dimethylamine agueous solution, zinc oxide and, interruption splashes into dithiocarbonic anhydride and reacts, the time of its reaction remains on more than 2 hours at least, the temperature of reaction of solution can also be controlled between 35-38 ℃, 39-42 ℃ or 42-45 ℃ in the control retort, but generally is no more than 50 ℃.Reaction under this condition is the most abundant, can obtain the optimal yield of ziram, generally between 93-98%.To reacting in the air stream drying operation after obtained ziram resultant is washed, dewatered, wherein the inlet temperature of air-flow be controlled at between 100-110 ℃, temperature out is controlled between 70-90 ℃, can obtain water ratio at the ziram below 0.5%.
Claims (7)
1, a kind of preparation method of ziram is characterized in that comprising the following steps:
At first add dimethylamine and zinc oxide in retort, constantly stir, and adding dithiocarbonic anhydride reacts in this retort, its reaction mechanism is:
2(CH
3)
2NH+2CS
2+ZnO→[(CH
3)
2N-CSS]
2Zn+H
2O
After dimethylamine, zinc oxide and dithiocarbonic anhydride fully react, the liquid in the retort to be discharged, the solids that will react generation again can make ziram through after washing, dehydration and the air stream drying operation.
2, the preparation method of a kind of ziram as claimed in claim 1 is characterized in that: the described dimethylamine that adds in retort is through the aqueous solution after the water dissolution.
3, the preparation method of a kind of ziram as claimed in claim 1 is characterized in that: the described temperature that adds entry, dimethylamine and zinc oxide reaction in retort is controlled between 30-80 ℃.
4, the preparation method of a kind of ziram as claimed in claim 3 is characterized in that: the described temperature that adds entry, dimethylamine and zinc oxide reaction in retort is controlled between 35-45 ℃.
5, as the preparation method of claim 2,3 or 4 described a kind of ziram, it is characterized in that: in described retort, add the mode that adds dithiocarbonic anhydride in entry, dimethylamine and the zinc oxide reaction process and be added dropwise to for the discontinuous point.
6, the preparation method of a kind of ziram as claimed in claim 1 is characterized in that: the time that described dimethylamine, zinc oxide and dithiocarbonic anhydride fully react is no less than 2 hours.
7, the preparation method of a kind of ziram as claimed in claim 1 is characterized in that: the airflow inlet temperature of described air stream drying operation is 100-110 ℃, and temperature out is 70-90 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610048400 CN1935788A (en) | 2006-10-08 | 2006-10-08 | Method for preparing ziram |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610048400 CN1935788A (en) | 2006-10-08 | 2006-10-08 | Method for preparing ziram |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1935788A true CN1935788A (en) | 2007-03-28 |
Family
ID=37953557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610048400 Pending CN1935788A (en) | 2006-10-08 | 2006-10-08 | Method for preparing ziram |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1935788A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103819375A (en) * | 2014-01-21 | 2014-05-28 | 青岛惠国新材料科技有限公司 | Synthetic method of high-purity solid sodium dimethyl dithiocarbamate |
| CN105732451A (en) * | 2016-02-01 | 2016-07-06 | 武汉径河化工（潜江)有限公司 | Method for producing zinc dimethyldithiocarbamate rubber vulcanization accelerant without wastewater generation |
| CN106316904A (en) * | 2015-06-25 | 2017-01-11 | 北大方正集团有限公司 | Method for recovering dimethylamine wastewater |
-
2006
- 2006-10-08 CN CN 200610048400 patent/CN1935788A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103819375A (en) * | 2014-01-21 | 2014-05-28 | 青岛惠国新材料科技有限公司 | Synthetic method of high-purity solid sodium dimethyl dithiocarbamate |
| CN105566188A (en) * | 2014-01-21 | 2016-05-11 | 泰山医学院 | Solid SDD (Sodium Dimethyl Dithiocarbamate) synthetic technology with short drying time |
| CN105566189A (en) * | 2014-01-21 | 2016-05-11 | 泰山医学院 | Production process of low-impurity solid sodium dimethyldithiocarbamate |
| CN105693580A (en) * | 2014-01-21 | 2016-06-22 | 青岛中科荣达新材料有限公司 | Production method for solid sodium dimethyl dithiocarbamate with purity of 99% or higher |
| CN105566188B (en) * | 2014-01-21 | 2017-11-17 | 泰山医学院 | A kind of short solid Sodium Dimethyldithiocarbamate synthesis technique of drying time |
| CN105693580B (en) * | 2014-01-21 | 2018-01-30 | 青岛中科荣达新材料有限公司 | A kind of production method of the solid Sodium Dimethyldithiocarbamate of purity more than 99% |
| CN106316904A (en) * | 2015-06-25 | 2017-01-11 | 北大方正集团有限公司 | Method for recovering dimethylamine wastewater |
| CN105732451A (en) * | 2016-02-01 | 2016-07-06 | 武汉径河化工（潜江)有限公司 | Method for producing zinc dimethyldithiocarbamate rubber vulcanization accelerant without wastewater generation |
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