CN219128306U - Desalination system in glufosinate production - Google Patents
Desalination system in glufosinate production Download PDFInfo
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- CN219128306U CN219128306U CN202223597760.4U CN202223597760U CN219128306U CN 219128306 U CN219128306 U CN 219128306U CN 202223597760 U CN202223597760 U CN 202223597760U CN 219128306 U CN219128306 U CN 219128306U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
Abstract
The application provides a desalination system in glufosinate production, including: the device comprises a salt-containing glufosinate-ammonium water aqua tank, a concentrating kettle, a condenser and a condensing water tank which are sequentially communicated with a gas phase outlet of the concentrating kettle, a crystallization kettle and a centrifugal machine which are sequentially communicated with a liquid phase outlet of the concentrating kettle, wherein a liquid outlet of the centrifugal machine is communicated with the salt-containing glufosinate-ammonium water aqua tank, and a crystal outlet of the centrifugal machine is communicated with an ammonium chloride receiving tank. The outlet of the condensed water tank is communicated with the liquid inlet of the centrifugal machine. The application reduces the use of primary water, avoids the waste of water resources, reduces the treatment load of the water treatment station, and reduces the energy consumption.
Description
Technical Field
The application relates to the technical field of glufosinate production, in particular to a desalination system in glufosinate production.
Background
Glufosinate is a broad-spectrum contact-killing type biocidal herbicide with a chemical formula of C 5 H 15 N 2 O 4 P has the chemical formula weight of 198.16 and has the characteristics of broad herbicide controlling spectrum, low toxicity, high activity, good environmental compatibility and the like. In the synthesis process of glufosinate-ammonium, ammonia water is added into glufosinate-ammonium hydrochloride for neutralization to generate glufosinate-ammonium acid, and then the glufosinate-ammonium is reacted with ammonia gas to generate glufosinate-ammonium, in the process, a large amount of ammonium chloride salt is generated, and the ammonium chloride salt and the generated glufosinate-ammonium are dissolved in a reaction solution together, and as the solvent in the reaction solution is water, the mixed solution of the ammonium chloride salt and the glufosinate-ammonium is a saliferous glufosinate-ammonium solution. Therefore, to obtain a pure glufosinate-ammonium product, it is first necessary to desalt, i.e. remove ammonium chloride, to obtain a desalted glufosinate-ammonium aqueous solution, and then to remove water to obtain a glufosinate-ammonium product.
In the desalination system used in the prior art, after heating and concentrating a salt-containing glufosinate-ammonium aqueous agent, cooling and crystallizing are carried out, according to different influences of temperature on solubility of glufosinate-ammonium and ammonium chloride in water, concentrating, cooling and crystallizing are carried out on ammonium chloride to remove ammonium chloride, a small amount of glufosinate-ammonium solution is carried in the obtained ammonium chloride crystal, the ammonium chloride crystal is required to be washed, and in the current large-scale industrial production, a large amount of primary water is required to be added into the system for salt washing, so that not only is water resource wasted, but also a large amount of industrial wastewater is generated, the treatment load of a wastewater treatment station is increased, and the production cost of enterprises is increased.
Disclosure of Invention
The present application provides a desalination system in glufosinate production to solve the above-mentioned problems mentioned in the background art.
The application provides a desalination system in glufosinate production, including: the device comprises a salt-containing glufosinate-ammonium water aqua tank, a concentrating kettle, a condenser and a condensing water tank which are sequentially communicated with a gas phase outlet of the concentrating kettle, a crystallization kettle and a centrifugal machine which are sequentially communicated with a liquid phase outlet of the concentrating kettle, wherein a liquid outlet of the centrifugal machine is communicated with the salt-containing glufosinate-ammonium water aqua tank, and a crystal outlet of the centrifugal machine is communicated with an ammonium chloride receiving tank.
The outlet of the condensed water tank is communicated with the liquid inlet of the centrifugal machine.
Optionally, the feed inlet of concentrated cauldron is connected with the inlet pipe, and the inlet pipe stretches into the inside of concentrated cauldron, and the discharge end of inlet pipe is connected with annular spray pipe, and annular spray pipe is close to the inner wall one side of concentrated cauldron and the inner wall detachable connection of concentrated cauldron.
Optionally, a plurality of spraying holes are formed in the annular spraying pipe, and the discharging directions of the spraying holes face the center of the concentrating kettle.
Optionally, a first concentration detector is arranged in the concentration kettle, and a second concentration detector is arranged in the desalted glufosinate-ammonium water aqua tank.
Optionally, the liquid outlet of the desalted glufosinate-ammonium water tank is communicated with the saliferous glufosinate-ammonium water tank through a liquid return pipeline, and is also communicated with the glufosinate refining device through a desalted glufosinate pipeline.
The liquid return pipeline is provided with a first regulating valve, and the desalted glufosinate pipeline is provided with a second regulating valve.
Optionally, the desalination system is further provided with a control device, and the control device is respectively connected with the first concentration detector, the second concentration detector, the first regulating valve and the second regulating valve.
Optionally, a negative pressure fan is connected between the condenser and the condensed water tank.
Optionally, a demister is arranged inside the concentrating kettle and is positioned at the upper part of the feed inlet of the concentrating kettle.
The desalination system in the glufosinate-ammonium production provided by the application realizes the removal of ammonium chloride in the saliferous glufosinate-ammonium aqueous agent, and compared with the prior art, the desalination system has the following beneficial effects:
(1) The aqueous solution of the salt-containing glufosinate-ammonium is heated through the concentration kettle, so that solvent water in the aqueous solution is gasified and evaporated, the concentration of ammonium chloride is increased to saturation, then the aqueous solution of the salt-containing glufosinate-ammonium is cooled and crystallized through the crystallization kettle, the crystal and the aqueous solution of the salt-containing glufosinate-ammonium are subjected to solid-liquid separation through the centrifugal machine, and meanwhile, the evaporated and condensed water is used for washing the ammonium chloride crystal, so that the ammonium chloride crystal is purer, and the recycling of waste water is realized.
(2) The outlet of the condensed water tank is communicated with the liquid inlet of the centrifugal machine, so that the ammonium chloride is used for washing, the use of primary water is reduced, the waste of water resources is avoided, the production of industrial wastewater is greatly reduced, the treatment load of a water treatment station is reduced, meanwhile, condensed water in the condensed water tank can be used for other working procedures in a factory, such as cooling and heating as a cooling medium or washing water as a heating medium, and the like, so that the production cost of enterprises is reduced, and good economic benefit and environmental protection benefit are brought to the enterprises.
(3) The saline glufosinate-ammonium water agent is divided into a plurality of liquid uniformly sprayed out by the annular spraying pipe, so that the heated area of the saline glufosinate-ammonium water agent is increased, meanwhile, the saline glufosinate-ammonium water agent is preheated by the jacket in the falling process, and when the saline glufosinate-ammonium water agent falls to the liquid at the bottom of the concentration kettle, the heating time is reduced, the water gasification and evaporation efficiency is improved, and the desalination efficiency is further improved.
(4) The desalination system in the glufosinate production that this application provided, simple structure, operation safe and reliable, and reduced the energy consumption, the operation is more convenient, is fit for expanding in the trade and promotes.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief description will be given below of the drawings that are needed in the embodiments or the prior art descriptions, and it is obvious that the drawings in the following description are some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a desalination system in glufosinate production according to one embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of a concentrating tank according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of a desalination system in glufosinate production according to another embodiment of the disclosure;
FIG. 4 is a schematic structural diagram of a desalination system in glufosinate production according to another embodiment of the disclosure;
FIG. 5 is a schematic diagram illustrating connection of a controller according to another embodiment of the present disclosure;
reference numerals illustrate:
1: concentrating the kettle; 2: a condenser; 3: a condensate water tank; 4: a crystallization kettle; 5: a centrifuge; 6: a desalination glufosinate-ammonium water aqua tank; 7: an ammonium chloride receiving tank; 8: a negative pressure fan; 9: a control device; 110: a first concentration detector; 120: a feed pipe; 130: an annular spray tube; 140: a spray hole; 150: a demister; 610: a second concentration detector; 620: a liquid return pipeline; 630: a desalination glufosinate pipeline; 640: a first regulating valve; 650: a second regulating valve; 660: a high-low liquid level sensor; 670: a second liquid return pipeline; 680: and a third regulating valve.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application are clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, are also within the scope of the present application based on the embodiments herein.
Fig. 1 is a schematic structural diagram of a desalination system in glufosinate production according to an embodiment of the present application, as shown in fig. 1, and the desalination system in glufosinate production includes: the salt-containing glufosinate-ammonium water tank, the concentration kettle 1, the condenser 2 and the condensation water tank 3 which are sequentially communicated with the gas phase outlet of the concentration kettle 1, the crystallization kettle 4 and the centrifugal machine 5 which are sequentially communicated with the liquid phase outlet of the concentration kettle 1, the liquid outlet of the centrifugal machine 5 is communicated with the salt-removing glufosinate-ammonium water tank 6, and the crystal outlet of the centrifugal machine 5 is communicated with the ammonium chloride receiving tank 7.
The outlet of the condensed water tank 3 is communicated with the liquid inlet of the centrifuge 5.
Specifically, the salt-containing glufosinate-ammonium water agent is pumped into the concentrating kettle 1 from a salt-containing glufosinate-ammonium water agent tank, a jacket is arranged outside the concentrating kettle 1, a heating medium is introduced into the jacket to heat the salt-containing glufosinate-ammonium water agent, so that solvent water in the salt-containing glufosinate-ammonium water agent is gasified and evaporated, is discharged to the condenser 2 through a gas phase outlet of the concentrating kettle 1 to be cooled, forms liquid condensed water, and falls into the condensing water tank 3 under the action of gravity for temporary storage.
After the water in the saliferous glufosinate-ammonium water agent is heated and evaporated, the concentration of the ammonium chloride is gradually increased, and the concentration of the ammonium chloride is increased to saturation along with the continuous evaporation. At the moment, the saturated saline glufosinate-ammonium water agent is conveyed to the crystallization kettle 4 through a liquid phase outlet at the bottom of the concentration kettle 1, meanwhile, a refrigerant is introduced into the crystallization kettle 4, the saturated saline glufosinate-ammonium water agent is cooled, and ammonium chloride crystals are continuously separated out, so that ammonium chloride crystals and desalted glufosinate-ammonium water agent are obtained.
And then, conveying the ammonium chloride crystal and the desalted glufosinate-ammonium aqueous solution to a centrifugal machine 5, performing solid-liquid separation by centrifugation, conveying the obtained liquid desalted glufosinate-ammonium aqueous solution to a desalted glufosinate-ammonium aqueous solution tank 6, and conveying the obtained solid ammonium chloride crystal to an ammonium chloride receiving tank 7 for temporary storage as a byproduct for selling because of the fact that trace glufosinate is carried in the ammonium chloride crystal, and repeatedly washing the ammonium chloride crystal, and conveying condensed water of a condensed water tank 3 to the centrifugal machine 5 to wash out the glufosinate-ammonium entrained in the ammonium chloride crystal, so that the ammonium chloride crystal is purer, and conveying the washed water solution containing trace glufosinate-ammonium to the desalted glufosinate-ammonium aqueous solution tank 6 to complete desalting of the salted glufosinate-ammonium aqueous solution.
Through the washing that is used for ammonium chloride crystal with the comdenstion water of condensate water pitcher 3, realized the waste water recycle, compare simultaneously in prior art and use water washing ammonium chloride crystal once, the scheme of this application has reduced the use of water once, avoided the water waste, greatly reduced industrial waste water's production, reduced the treatment load of sewage treatment station, simultaneously, can also be with the comdenstion water in the condensate water pitcher 3 in the mill other processes of being used for the mill, as cooling medium cooling, after rising the temperature as heating medium or as washing water etc. has reduced the manufacturing cost of enterprise, bring fine economic benefits and environmental protection benefit for the enterprise.
Through the scheme, the ammonium chloride in the saline glufosinate-ammonium aqueous solution is removed. The aqueous solution of the salt-containing glufosinate-ammonium is heated through the concentration kettle, so that solvent water in the aqueous solution is gasified and evaporated, the concentration of ammonium chloride is increased to saturation, then the aqueous solution of the salt-containing glufosinate-ammonium is cooled and crystallized through the crystallization kettle, the crystals and the aqueous solution of the salt-containing glufosinate-ammonium are subjected to solid-liquid separation through the centrifugal machine, and meanwhile, condensed water obtained by evaporation and condensation is used for washing ammonium chloride crystals, so that the ammonium chloride crystals are purer, and the recycling of waste water is realized. The use of primary water is reduced, the waste of water resources is avoided, the production of industrial wastewater is greatly reduced, the treatment load of a water treatment station is reduced, meanwhile, condensed water in a condensed water tank can be used for other working procedures in a factory, such as cooling medium, heating medium or washing water after being cooled and heated, the production cost of enterprises is reduced, and good economic benefit and environmental protection benefit are brought to the enterprises.
Fig. 2 is a schematic structural diagram of a concentrating kettle according to an embodiment of the present application, as shown in fig. 2, optionally, a feed inlet of the concentrating kettle 1 is connected with a feed pipe 120, the feed pipe 120 extends into the concentrating kettle 1, a discharge end of the feed pipe 120 is connected with an annular spray pipe 130, and one side of the annular spray pipe 130 close to an inner wall of the concentrating kettle 1 is detachably connected with the inner wall of the concentrating kettle 1.
Specifically, contain salt glufosinate-ammonium water aqua passes through inside inlet pipe 120 gets into concentrated cauldron 1, get into annular spray pipe 130 through the discharge end of inlet pipe 120, contain salt glufosinate-ammonium water aqua and spray to the lower part of concentrated cauldron 1 through annular spray pipe 130, set up like this and compare in only setting up inlet pipe 120, the scheme of this application is divided into the even blowout of stranded liquid with containing salt glufosinate-ammonium water aqua through annular spray pipe 130 for contain the area increase that is heated of salt glufosinate-ammonium water aqua, preheat through the clamp cover at whereabouts in-process simultaneously, and then when the liquid of whereabouts to concentrated cauldron 1 bottom, reduce heating time, improve the efficiency of hydrosilation evaporation, and then improve desalination efficiency.
One side of the annular spraying pipe 130, which is close to the inner wall of the concentration kettle 1, is detachably connected with the inner wall of the concentration kettle 1, so that workers can conveniently detach, install and overhaul the annular spraying pipe 130.
Optionally, the annular spraying pipe 130 is provided with a plurality of spraying holes 140, and the discharging directions of the spraying holes 140 are all toward the center of the concentrating kettle 1.
Specifically, the discharging directions of the spraying holes 140 face the center of the concentrating kettle 1, so that the salt-containing glufosinate-ammonium water agent is uniformly sprayed out, and meanwhile, the influence on the liquid level when the water agent falls to the liquid below is reduced.
Fig. 3 is a schematic structural diagram of a desalination system in glufosinate production according to another embodiment of the present application, as shown in fig. 3, optionally, a first concentration detector 110 is disposed inside the concentration kettle 1, and a second concentration detector 610 is disposed inside the aqueous solution tank 6 for desalinating glufosinate.
Specifically, the first concentration detector 110 and the second concentration detector 610 are both used for detecting the concentration of ammonium chloride, and the first concentration detector 110 is arranged inside the concentration kettle 1, so that an operator can know the concentration of ammonium chloride conveniently, and whether the ammonium chloride is saturated or not is determined. Meanwhile, the second concentration detector 610 is used to detect the concentration of ammonium chloride in the desalted glufosinate-ammonium aqueous solution.
Optionally, as shown in fig. 3, the liquid outlet of the desalted glufosinate-ammonium water tank 6 is communicated with the salt-containing glufosinate-ammonium water tank through a liquid return pipeline 620, and the liquid outlet of the desalted glufosinate-ammonium water tank 6 is also communicated with the glufosinate refining device through a desalted glufosinate pipeline 630.
A first regulator valve 640 is provided on the liquid return line 620 and a second regulator valve 650 is provided on the desalted glufosinate line 630.
Specifically, when the second concentration detector 610 detects that the ammonium chloride concentration in the desalted glufosinate-ammonium aqueous solution is greater than or equal to the preset concentration, the first regulating valve 640 is opened, the desalted glufosinate-ammonium aqueous solution is returned to the salt-containing glufosinate-ammonium aqueous solution tank through the liquid return pipeline 620 for repeated desalination, and when the second concentration detector 610 detects that the ammonium chloride concentration in the desalted glufosinate-ammonium aqueous solution is less than the preset concentration, the second regulating valve 650 is opened, and the desalted glufosinate-ammonium aqueous solution is conveyed to the next glufosinate-ammonium refining device for purification through the desalted glufosinate-ammonium pipeline 630, so that the operation of a desalting system is more convenient, and the desalting efficiency is improved.
More preferably, fig. 4 is a schematic structural diagram of a desalination system in glufosinate production according to still another embodiment of the present application, and as shown in fig. 4, the desalted glufosinate aqueous solution in the desalted glufosinate aqueous solution tank 6 is used as a condensing medium of the condenser 2. The liquid outlet of the desalted glufosinate-ammonium water tank 6 is also connected with a condensing medium inlet of the condenser 2 through a second liquid return pipeline 670, the condensing medium inlet of the condenser 2 is also connected with a condensing liquid pipe network, and a high-low liquid level sensor 660 is also arranged inside the desalted glufosinate-ammonium water tank 6.
When the desalination system starts to operate, the amount of the desalted glufosinate-ammonium water agent in the desalted glufosinate-ammonium water agent tank 6 is small and insufficient to condensate the condenser 2, at the moment, the third regulating valve 680 is closed, a condensing medium inlet of the condenser 2 is connected with a condensing liquid pipe network, water vapor from the condensing kettle 1 is condensed through a condensing medium of the external condensing liquid pipe network, along with the operation of the system, the liquid level in the desalted glufosinate-ammonium water agent tank 6 continuously rises, when the liquid level value detected by the high-low liquid level sensor 660 is larger than a first preset liquid level value and the ammonium chloride concentration value detected by the second concentration detector 610 is larger than or equal to a preset concentration, the third regulating valve 680 is opened, and the desalted glufosinate-ammonium water agent is conveyed to the salt-containing glufosinate-ammonium water agent tank after heat exchange between the condenser 2 and the water vapor through the second liquid return pipeline 670 for multiple desalination. When the liquid level in the desalted glufosinate-ammonium water tank 6 continuously rises, and the liquid level value detected by the high-low liquid level sensor 660 is larger than or equal to a second preset liquid level value, the first regulating valve 640 is opened, and the desalted glufosinate-ammonium water is returned to the saliferous glufosinate-ammonium water tank through the liquid return pipeline 620 and the second liquid return pipeline 670. When the ammonium chloride concentration value detected by the second concentration detector 610 is smaller than the preset concentration, the first regulating valve 640 and the third regulating valve 680 are closed, the second regulating valve 650 is opened, and the desalted glufosinate-ammonium aqueous solution is conveyed to the next glufosinate-ammonium refining device for purification. The arrangement reduces the use of condensate, reasonably utilizes the cold energy of the desalted glufosinate-ammonium water agent in the desalted glufosinate-ammonium water agent tank 6, reduces the cold energy consumption, saves resources and reduces the production cost.
Optionally, as shown in fig. 5, the desalination system is further provided with a control device 9, and the control device 9 is connected to the first concentration detector 110, the second concentration detector 610, the first regulating valve 640, and the second regulating valve 650, respectively.
Specifically, the first concentration detector 110 is used for detecting the concentration of ammonium chloride in the concentration kettle 1, the second concentration detector 610 is used for detecting the concentration of ammonium chloride in the desalted glufosinate-ammonium water tank 6, and transmitting a concentration signal to the control device 9, and the control device 9 controls the first regulating valve 640 and the second regulating valve 650 to start and stop according to the received concentration signal.
Fig. 5 is a schematic connection diagram of a controller according to another embodiment of the present application, as shown in fig. 5, more preferably, the controller 9 is further connected to the high-low liquid level sensor 660 and the third regulating valve 680, respectively, and the controller 9 controls the start and stop of the third regulating valve 680 according to the received liquid level signal of the high-low liquid level sensor 660.
Optionally, a negative pressure fan 8 is connected between the condenser 2 and the condensate water tank 3.
Specifically, the negative pressure fan 8 is used for providing negative pressure, sucking the vapor generated in the concentrating kettle 1 to the condenser 2 for condensation, and sucking the condensed water in the condenser 2 to the condensed water tank 3, so that the condensation rate of the vapor is improved, and the operation efficiency of the desalination system is further improved.
As shown in fig. 2, optionally, a demister 150 is disposed inside the concentrating tank 1, and the demister 150 is located at an upper portion of a feed inlet of the concentrating tank 1.
Specifically, in the concentrating kettle 1, a small amount of liquid drops are entrained by the rising water vapor and the saline glufosinate-ammonium water agent sprayed from the annular spraying pipe 130, and the liquid drops are captured by the demister 150 and fall back into the concentrating kettle 1, so that the escape of the liquid drops along with the water vapor is avoided, and the purity of ammonium chloride is improved.
The technical scheme of the present application is illustrated in detail by specific examples below.
The operation flow of the desalination system in the production of glufosinate-ammonium in the embodiment during specific work is as follows:
when the desalination system starts to operate, the salt-containing glufosinate-ammonium water agent is pumped into the concentration kettle 1 from the salt-containing glufosinate-ammonium water agent tank, a jacket is arranged outside the concentration kettle 1, the salt-containing glufosinate-ammonium water agent is heated by introducing a heating medium into the jacket, so that solvent water in the salt-containing glufosinate-ammonium water agent is gasified and evaporated, water vapor is discharged to the condenser 2 for cooling under the action of the negative pressure fan 8 through a gas phase outlet of the concentration kettle 1, a condensing medium inlet of the condenser 2 is connected with a condensing medium pipe network, the water vapor from the concentration kettle 1 is condensed through a condensing medium of an external condensing medium pipe network to form liquid condensed water, and the liquid condensed water falls into the condensing water tank 3 for temporary storage under the action of gravity.
Along with the system operation, the concentration of ammonium chloride in the concentration kettle 1 gradually rises, the first concentration detector 110 transmits a concentration signal to the control device 9, when the concentration signal received by the control device 9 is greater than or equal to a preset saturation concentration, the saturated saline glufosinate-ammonium aqueous solution is conveyed to the crystallization kettle 4 through a liquid phase outlet at the bottom of the concentration kettle 1, simultaneously, a refrigerant is introduced into the crystallization kettle 4, the saturated saline glufosinate-ammonium aqueous solution is cooled, and ammonium chloride crystals are continuously separated out, so that ammonium chloride crystals and desalted glufosinate-ammonium aqueous solution are obtained. And then, the ammonium chloride crystal and the desalted glufosinate-ammonium aqueous solution are conveyed to a centrifugal machine 5, solid-liquid separation is carried out through centrifugation, the obtained liquid desalted glufosinate-ammonium aqueous solution is conveyed to a desalted glufosinate-ammonium aqueous solution tank 6, along with the operation of the system, the liquid level in the desalted glufosinate-ammonium aqueous solution tank 6 continuously rises, when the liquid level value detected by a high-low liquid level sensor 660 is greater than a first preset liquid level value and the ammonium chloride concentration value detected by a second concentration detector 610 is greater than or equal to a preset concentration, a third regulating valve 680 is opened, and the desalted glufosinate-ammonium aqueous solution is conveyed to a salt-containing glufosinate-ammonium aqueous solution tank after heat exchange between a condenser 2 and water vapor through a second liquid return pipeline 670 for multiple desalting. When the liquid level in the desalted glufosinate-ammonium water tank 6 continuously rises, and the liquid level value detected by the high-low liquid level sensor 660 is larger than or equal to a second preset liquid level value, the first regulating valve 640 is opened, and the desalted glufosinate-ammonium water is returned to the saliferous glufosinate-ammonium water tank through the liquid return pipeline 620 and the second liquid return pipeline 670. When the ammonium chloride concentration value detected by the second concentration detector 610 is smaller than the preset concentration, the first regulating valve 640 and the third regulating valve 680 are closed, the second regulating valve 650 is opened, and the desalted glufosinate-ammonium aqueous solution is conveyed to the next glufosinate-ammonium refining device for purification.
The obtained solid ammonium chloride crystal is provided with trace glufosinate, condensed water of the condensed water tank 3 is conveyed to the centrifugal machine 5, the glufosinate carried in the ammonium chloride crystal is washed, so that the ammonium chloride crystal is purer, meanwhile, the washed water solution containing trace glufosinate is conveyed to the desalting glufosinate water tank 6, the desalting of the saline glufosinate water is completed, and the obtained ammonium chloride crystal is conveyed to the ammonium chloride receiving tank 7 for temporary storage and can be sold as a byproduct.
Finally, it should be noted that the above embodiments are merely for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand; the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims (8)
1. A desalination system in the production of glufosinate comprising: the device comprises a salt-containing glufosinate-ammonium water tank, a concentrating kettle (1), a condenser (2) and a condensing water tank (3) which are sequentially communicated with a gas phase outlet of the concentrating kettle (1), a crystallization kettle (4) and a centrifugal machine (5) which are sequentially communicated with a liquid phase outlet of the concentrating kettle (1), wherein a liquid outlet of the centrifugal machine (5) is communicated with a desalted glufosinate-ammonium water tank (6), and a crystal outlet of the centrifugal machine (5) is communicated with an ammonium chloride receiving tank (7);
the outlet of the condensed water tank (3) is communicated with the liquid inlet of the centrifugal machine (5).
2. The desalination system in glufosinate production of claim 1, wherein the feed inlet of the concentration kettle (1) is connected with a feed pipe (120), the feed pipe (120) stretches into the concentration kettle (1), the discharge end of the feed pipe (120) is connected with an annular spray pipe (130), and one side of the annular spray pipe (130) close to the inner wall of the concentration kettle (1) is detachably connected with the inner wall of the concentration kettle (1).
3. The desalination system in glufosinate-ammonium production of claim 2, wherein the annular spray pipe (130) is provided with a plurality of spray holes (140), and the discharge directions of the spray holes (140) are all toward the center of the concentration kettle (1).
4. The desalination system in glufosinate-ammonium production of claim 1, wherein a first concentration detector (110) is arranged inside the concentration kettle (1), and a second concentration detector (610) is arranged inside the desalted glufosinate-ammonium water tank (6).
5. The desalination system in glufosinate production of claim 4, wherein the liquid outlet of the desalinated glufosinate liquid tank (6) is communicated with the saliferous glufosinate liquid tank through a liquid return pipeline (620), and the liquid outlet of the desalinated glufosinate liquid tank (6) is also communicated with a glufosinate refining device through a desalinated glufosinate liquid pipeline (630);
the liquid return pipeline (620) is provided with a first regulating valve (640), and the desalted glufosinate-ammonium pipeline (630) is provided with a second regulating valve (650).
6. The desalination system in glufosinate production of claim 5, further comprising a control device (9), wherein the control device (9) is connected to the first concentration detector (110), the second concentration detector (610), the first regulating valve (640), and the second regulating valve (650), respectively.
7. Desalination system in glufosinate production according to claim 1, wherein a negative pressure fan (8) is connected between the condenser (2) and the condensate water tank (3).
8. Desalination system in glufosinate production according to any one of claims 1-7, wherein a demister (150) is arranged inside the concentrating tank (1), wherein the demister (150) is located at the upper part of the feed inlet of the concentrating tank (1).
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