CN111892515A - Production method and production device of carbamido chelating agent - Google Patents
Production method and production device of carbamido chelating agent Download PDFInfo
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- CN111892515A CN111892515A CN201911385837.1A CN201911385837A CN111892515A CN 111892515 A CN111892515 A CN 111892515A CN 201911385837 A CN201911385837 A CN 201911385837A CN 111892515 A CN111892515 A CN 111892515A
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C273/00—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
- C07C273/18—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups of substituted ureas
- C07C273/1854—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups of substituted ureas by reactions not involving the formation of the N-C(O)-N- moiety
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- B01J19/0006—Controlling or regulating processes
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
- B01J19/0013—Controlling the temperature of the process
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- B01J19/0006—Controlling or regulating processes
- B01J19/002—Avoiding undesirable reactions or side-effects, e.g. avoiding explosions, or improving the yield by suppressing side-reactions
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- B01J4/00—Feed or outlet devices; Feed or outlet control devices
- B01J4/001—Feed or outlet devices as such, e.g. feeding tubes
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J4/00—Feed or outlet devices; Feed or outlet control devices
- B01J4/001—Feed or outlet devices as such, e.g. feeding tubes
- B01J4/007—Feed or outlet devices as such, e.g. feeding tubes provided with moving parts
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2204/00—Aspects relating to feed or outlet devices; Regulating devices for feed or outlet devices
- B01J2204/002—Aspects relating to feed or outlet devices; Regulating devices for feed or outlet devices the feeding side being of particular interest
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
- B01J2219/00054—Controlling or regulating the heat exchange system
- B01J2219/00056—Controlling or regulating the heat exchange system involving measured parameters
- B01J2219/00058—Temperature measurement
- B01J2219/00063—Temperature measurement of the reactants
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- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
- B01J2219/00074—Controlling the temperature by indirect heating or cooling employing heat exchange fluids
- B01J2219/00087—Controlling the temperature by indirect heating or cooling employing heat exchange fluids with heat exchange elements outside the reactor
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
- B01J2219/00132—Controlling the temperature using electric heating or cooling elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
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- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00182—Controlling or regulating processes controlling the level of reactants in the reactor vessel
Abstract
The invention belongs to the technical field of chelating agents, and particularly relates to a production method and a production device of a carbamido chelating agent. Mixing the raw material A with water, adding the raw material B and alkali into the mixed solution, and uniformly stirring; adjusting the pH value to 6-13, and stirring for 6-48h under heating condition to obtain the product ureido chelating agent. The method has the advantages that industrial raw materials which are widely industrialized and produced in large scale are adopted as main raw materials, the raw materials are simple and easy to obtain, and the production cost is low; one-step synthesis and simple synthesis process; the reaction condition is mild, and the industrial production is easy to realize; water is used as a solvent, and no organic solvent is used, treated and discharged. The reaction product has a single structure and no or few byproducts. The reaction device is simple, has no high pressure or over high temperature, and has low material requirement and low device cost.
Description
Technical Field
The invention belongs to the technical field of chelating agents, and particularly relates to a production method and a production device of a carbamido chelating agent.
Background
Calcium, magnesium, zinc, manganese, iron, copper and other elements are essential trace elements for plant growth. Although these elements are not deficient in nature, they are generally less available for direct absorption by plants, because they are easily deposited as insoluble salts in the soil environment or adsorbed by the soil granules so as to be immobile and thus cannot be absorbed by plants.
In addition, a large amount of elemental phosphorus required by plant growth is generally applied in the forms of fertilizers such as ammonium phosphate, monopotassium phosphate and the like, and phosphate radicals are very easy to form phosphate precipitates with calcium, magnesium, zinc, manganese, iron, copper and the like, so that the plants cannot absorb trace elements and the absorption and utilization of phosphorus are influenced.
In order to activate trace elements in soil and fertilizers and inhibit the influence of phosphate radicals and the like on the precipitation of the trace elements, chelating trace elements can be generated by adding a chelating agent into the fertilizers, so that the absorption and utilization of plants are promoted, the absorption and utilization of the plants on phosphorus are not influenced, the fertilizer efficiency is improved, and the obvious economic and social values are achieved.
At present, the agricultural chelating agent mainly comprises EDTA (ethylene diamine tetraacetic acid and various salts thereof), but because the EDTA is not biodegradable, is not absorbed and utilized by plants, has the defects of potential carcinogenicity, environmental pollution caused by large-scale use and the like, the use of the EDTA in some industries is limited and forbidden in China. As in "textile products HJ 2546-: ethylenediaminetetraacetic acid (EDTA) and diethyltriaminepentaacetic acid ester (DTPA)'; in "cultural paper HJT 410 and 2007, '5.1.3, the use of ethylenediaminetetraacetic acid (EDTA)' is prohibited. In addition, the agricultural fertilizer has been used for many years, the residue in soil is more, the yield increasing effect is reduced year by year, and a novel easily-degradable chelating agent is urgently needed to meet the market demand.
Although a novel easily degradable chelating agent (such as IDS, iminodisuccinic acid and salts thereof) is used as a fertilizer synergist in the market at present, the chelating agent is degraded into water, carbon dioxide and the like through biology, and causes raw material waste while carbon in large gas is discharged.
At present, a sulfur-containing chelating agent is urgently needed in agriculture, which not only can supplement sulfur for plants, but also can activate calcium ions in soil and supplement chelated calcium for the plants. And the production process is simple and is easy for large-scale industrial production.
No sulphur-reducing chelating agent exists in the current market, and the thiourea-based polycarboxyl chelating agent can just meet the requirement.
Disclosure of Invention
The invention aims to solve the technical problem of providing a chelating agent containing sulfur and capable of activating calcium element and a production method thereof, so as to solve the problem of soil hardening caused by adding ammonium sulfate in the fertilizer in the prior art.
The invention discloses a production method of a carbamido chelating agent, which comprises the following steps:
and 2, adjusting the pH value to 6-13, and stirring for 6-48h under a heating condition to obtain the carbamido chelating agent product.
Further, the ureido chelating agent is a compound represented by the general formula (III):
wherein:
R1、R2selected from:
and all possible isomers of the above compounds, or hydrates of the above compounds and all possible isomers thereof.
Wherein: m may be H+、NH4 +、Na+、K+、Ca2+、Zn2+、Mg2+、Cu2+、Mn2+、Fe3+One or more of them.
Further, the present invention discloses a preferred structure of the ureido chelating agent:
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
and all possible isomers of the above compounds, or hydrates of the above compounds and all possible isomers thereof.
Wherein: m may be H+、NH4 +、Na+、K+、Ca2+、Zn2+、Mg2+、Cu2+、Mn2+、Fe3+One or more of them.
Further, the raw material A can be generated by hydrolysis, alkaline hydrolysis and acid hydrolysis
A compound of any one of the groups.
Preferably, the raw material A adopts:
and any one or a mixture of more of anhydride, salt and ester of the compound in any proportion.
The raw material B can generate urea (carbamide) through hydrolysis, alkaline hydrolysis and acid hydrolysis or can generate a compound shown as a general formula (IV) through hydrolysis, alkaline hydrolysis and acid hydrolysis and an ester, an amide and a salt thereof,
wherein R is3Selected from:
any one of the groups;
wherein: m may be H+、NH4 +、Na+、K+、Ca2+、Zn2+、Mg2+、Cu2+、Mn2+、Fe3+One or more of them.
Further, the alkali is any one or a mixture of several of alkali metal, alkaline earth metal oxide, hydroxide, carbonate, bicarbonate and ammonia (and derivatives) in any proportion.
Preferably, the alkali is at least one of sodium hydroxide, sodium carbonate and sodium bicarbonate.
Further, in step 1, firstly, adding alkali into the mixture of the raw material A and water, stirring uniformly, and then adding the raw material B. The aim is to prevent the urea groups from decomposing under excessively high alkaline conditions.
Further, in the production method, the adding amount of water is 30-70 wt% of the total reaction system.
Further, in the production method, the amount of the raw material A is 1 standard part and the amount of the raw material B is 0.4-0.6 part according to the material amount ratio when the raw material A is urea (carbamide).
Preferably, in the production method, the amount of the raw material A is 1 standard part, and the amount of the raw material B is 0.5 part when the raw material B is urea (carbamide) according to the ratio of the amount of the materials.
Further, in the production method, according to the mass ratio, the adding amount of the raw material A is 1 standard part, and when the raw material B is a compound shown by a general formula (IV) and an ester, an amide or a salt thereof, the adding amount is 0.9-1.3 parts.
Preferably, in the production method, according to the amount ratio of substances, the adding amount of the raw material A is 1 standard part, and the adding amount of the raw material B is 1 part when the compound shown in the general formula (IV) and the ester, amide and salt thereof are adopted. .
Further, in the production method, the heating temperature is 55 ℃ to the boiling reflux temperature.
Preferably, in the production method, the heating temperature is 95 ℃ to 100 ℃.
Furthermore, the invention also discloses a production device of the carbamido chelating agent, which comprises a reaction device, a temperature adjusting device, a detection device and a liquid feeding device;
the reaction device comprises a reactor and a stirrer, wherein a solid feeding hole, a liquid feeding hole and a discharging hole are formed in the reactor, the solid feeding hole is formed in the upper portion of the reactor, the liquid feeding hole is formed in the upper portion of the reactor, and the discharging hole is formed in the lower portion of the reactor; the stirrer is arranged on the reactor and used for promoting the materials in the reactor to be uniformly mixed;
the temperature adjusting device is arranged on the reactor and adopts at least one of a jacket, a coil pipe and an electric heating device, the jacket and the coil pipe exchange heat with materials in the reactor through internal heating media, and the heat exchange comprises heating and cooling;
the detection device comprises a thermometer, and the thermometer is arranged on the reactor and used for measuring the internal temperature of the reactor;
the liquid feed device comprises a liquid storage tank; and the outlet of the liquid storage tank is connected with the liquid feeding hole.
Further, the detection device also comprises a pH meter which is arranged on the reactor and used for measuring the pH value inside the reactor.
Further, the reaction device adopts at least one of a tubular reactor and a kettle type reactor.
Further, detection device still includes the level gauge, the level gauge sets up on the liquid storage tank for measure the inside liquid level of liquid storage tank.
Further, the liquid level meter is connected with the opening degree of a valve at the liquid feed inlet;
the thermometer is connected with the temperature adjusting device switch;
when the temperature adjusting device adopts a jacket and a coil, the thermometer is connected with the opening of the inlet valve and the outlet of the temperature adjusting device, and the temperature is automatically controlled by automatically adjusting the opening of the valve;
when the temperature adjusting device adopts an electric heating device, the temperature measuring device is connected with the heat exchange device in a current locking way, and the temperature is automatically controlled by automatically adjusting the current.
Further, the production device of the thiourea-based chelating agent also comprises a solid feeding device, wherein the solid feeding device comprises a solid storage tank and a solid feeder; the inlet of the solid feeder is connected with the outlet of the solid storage tank, and the outlet of the solid feeder is connected with the solid feeding hole.
Further, the bottom of the solid storage tank is conical, and the outlet of the solid storage tank is arranged at the bottommost part of the conical shape.
Further, the solid feeder adopts at least one of a conveyor belt and a screw feeder.
Further, the production device of the thiourea-based chelating agent further comprises an alarm, the alarm is connected with the detection device, and when the numerical value of the detection device exceeds a preset value, the alarm gives an alarm. When the liquid level of the liquid level meter exceeds the highest preset value and the lowest preset value, the alarm gives an alarm; and when the thermometer exceeds a preset value, the alarm gives an alarm.
Further, the production device of the thiourea-based chelating agent also comprises a filtering device, and the filtering device is connected with the discharge hole. The filtering device is used for filtering solid impurity particles in the product, and the filtrate is the product which can be directly canned for sale.
Particularly, in the production method, the reaction raw materials and the product are free of gas, the reaction can be carried out under normal pressure without high-pressure equipment, and the reaction system is carried out under a water phase.
The invention has the beneficial effects that:
1. the industrial raw materials which are widely industrialized and produced in large scale are adopted as the main raw materials, the raw materials are simple and easy to obtain, and the production cost is low; one-step synthesis and simple synthesis process; the reaction condition is mild, and the industrial production is easy to realize; water is used as a solvent, and no organic solvent is used, treated and discharged.
2. The reaction product has a single structure and no or few byproducts.
3. The reaction device is simple, has no high pressure or over high temperature, and has low material requirement and low device cost.
Drawings
FIG. 1 is a schematic view of a connection structure according to the present invention;
FIG. 2 is a schematic view of a reaction apparatus according to the present invention;
FIG. 3 is a schematic view of the structure of the solid feeding device of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention discloses a production method of a carbamido chelating agent, which comprises the following steps:
raw material A adopts
Adopting a raw material B;
the alkali is sodium hydroxide.
and 2, adjusting the pH value to 9.5, and stirring for 32 hours at 95 ℃ under the condition of heat preservation to obtain a product chelating agent, namely ureido disuccinic acid trisodium.
The invention also discloses a production device of the carbamido chelating agent, which comprises a reaction device 1, a temperature adjusting device 2, a detection device 3 and a liquid feeding device 4;
the reaction device 1 comprises a reactor 11 and a stirrer 12, wherein a solid feeding hole 111, a liquid feeding hole 112 and a discharging hole 113 are formed in the reactor 11, the solid feeding hole 111 is formed in the upper portion of the reactor 11, the liquid feeding hole 112 is formed in the upper portion of the reactor 11, and the discharging hole 113 is formed in the lower portion of the reactor 11; the stirrer 12 is arranged on the reactor 11 and used for promoting the materials in the reactor 11 to be uniformly mixed;
the temperature adjusting device 2 is arranged on the reactor 11, the temperature adjusting device 2 adopts at least one of a jacket, a coil and an electric heating device, the jacket and the coil exchange heat with materials in the reactor 11 through internal heating media, and the heat exchange comprises heating and cooling;
the detection device 3 comprises a thermometer 31, wherein the thermometer 31 is arranged on the reactor 11 and is used for measuring the internal temperature of the reactor 11;
the liquid feeding device 4 comprises a liquid storage tank 41; the outlet of the liquid storage tank 41 is connected with the liquid feed port 112.
In this embodiment, the detecting device further includes a pH meter 32, and the pH meter 32 is disposed on the reactor 11 for measuring the pH value inside the reactor 11.
In this embodiment, the reaction apparatus 1 employs at least one of a tubular reactor and a tank reactor.
In this embodiment, the detecting device 3 further includes a liquid level meter 33, and the liquid level meter 33 is disposed on the liquid storage tank 41 and is used for measuring the liquid level inside the liquid storage tank 41.
In this embodiment, the liquid level meter 33 is connected to the opening of the valve at the liquid inlet 112;
the thermometer 31 is connected with the temperature adjusting device 2 through a switch;
when the temperature adjusting device 2 adopts a jacket and a coil, the thermometer 31 is connected with the opening of an inlet valve and an outlet of the temperature adjusting device 2, and the temperature is automatically controlled by automatically adjusting the opening of the valve;
when the temperature adjusting device 2 adopts an electric heating device, the temperature measuring device is connected with the heat exchange device through current, and the temperature is automatically controlled by automatically adjusting the current.
In this embodiment, the apparatus for producing a urea-based chelant further comprises a solid feeding device 5, wherein the solid feeding device 5 comprises a solid storage tank 51 and a solid feeder 52; the inlet of the solid feeder 52 is connected with the outlet of the solid storage tank 51, and the outlet of the solid feeder 52 is connected with the solid feeding hole 111.
In the embodiment, the bottom of the solid storage tank 51 is conical, and the outlet of the solid storage tank 51 is arranged at the bottommost part of the conical shape.
In the embodiment, the solid feeder 52 is at least one of a conveyor belt and a screw feeder.
In this embodiment, the apparatus for producing a urea-based chelating agent further comprises an alarm 6, the alarm 6 is linked with the detection device 3, and when the value of the detection device 3 exceeds a preset value, the alarm 6 gives an alarm. When the liquid level of the liquid level meter 33 exceeds the highest preset value and the lowest preset value, the alarm 6 gives an alarm; and when the thermometer 31 exceeds a preset value, the alarm 6 gives an alarm.
In this embodiment, the apparatus for producing a urea-based chelating agent further includes a filtering device 7, and the filtering device 7 is connected to the discharge port 113. The filtering device 7 is used for filtering solid impurity particles in the product, and the filtrate is the product which can be directly canned for sale.
Examples 2 to 6
Examples 2-6 the procedure used in example 1 was followed, with only the choice of starting materials and the choice of reaction conditions being varied, the specific schemes being shown in tables 1-4.
In the examples 1 to 6, the following examples were carried out,
table 1 examples 1-6 raw material selection table
Table 2 examples 1-6 table of reaction conditions
TABLE 3 tabulated structural formulas of the urea-based chelants of the products of examples 1-6
Remarking: since the carboxylate and carboxyl groups of the polycarboxyl compound coexist, the structural formula of the compound is only used for representing the structure of the obtained product and is not all actual substances of the product. In reaction 7, the main product N7 at pH 6.8 is simply disodium ureidosuccinate, but in practice monosodium, disodium, trisodium ureidosuccinate (and hydrates thereof) are present in solution, and there may be traces of monosodium ureidosuccinate and tetrasodium ureidosuccinate (and hydrates thereof).
TABLE 4 urea-based chelating agent yields and yields for the products of examples 1-6
| Examples | Yield (mol) |
| 1 | 8 |
| 2 | 8.3 |
| 3 | 7.5 |
| 4 | 7.9 |
| 5 | 8.5 |
| 6 | 7.7 |
| 7 | 9.1 |
| 8 | 8.8 |
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (12)
1. A method for producing a urea-based chelating agent, comprising the steps of:
step 1, mixing a raw material A with water, adding a raw material B and alkali into the mixed solution, and uniformly stirring;
and 2, adjusting the pH value to 6-13, and stirring for 6-48h under a heating condition to obtain the carbamido chelating agent product.
2. The method for producing a urea-based chelating agent according to claim 1, wherein the urea-based chelating agent is a compound represented by the general formula (I):
wherein:
R1、R2selected from:
and all possible isomers of the above compounds, or hydrates of the above compounds and all possible isomers thereof.
Wherein: m may be H+、NH4 +、Na+、K+、Ca2+、Zn2+、Mg2+、Cu2+、Mn2+、Fe3+One or more of them.
3. The method for the production of urea-based chelants according to claim 2, wherein the preferred structure of the urea-based chelants is:
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
wherein: m may be H+、NH4 +、Na+、K+、Ca2+、Zn2+、Mg2+、Cu2+、Mn2+、Fe3+One or more of them.
And all possible isomers of the above compounds, or hydrates of the above compounds and all possible isomers thereof.
4. The method for producing a urea-based chelating agent according to claim 1, wherein the raw material A is a raw material capable of being produced by hydrolysis, alkaline hydrolysis or acid hydrolysis
A compound of any one of the groups;
the raw material B can generate urea (carbamide) through hydrolysis, alkaline hydrolysis and acid hydrolysis or generate a compound shown by a general formula (II) through hydrolysis, alkaline hydrolysis and acid hydrolysis, and ester, amide and salt thereof,
wherein R is3Selected from:
any one of the groups;
wherein: m may be H+、NH4 +、Na+、K+、Ca2+、Zn2+、Mg2+、Cu2+、Mn2+、Fe3+One or more of them.
The alkali is any one or a mixture of several of alkali metal, alkaline earth metal oxide, hydroxide, carbonate, bicarbonate and ammonia (and derivatives) in any proportion.
5. The method for the production of a urea-based chelant according to claim 1 wherein feedstock a is selected from the group consisting of: one or more of maleic acid (and salts), maleic anhydride, fumaric acid (and salts), glutaconic acid (and salts); the raw material B is selected from: urea (carbamide), ureido succinic acid (and salts), ureido glutaric acid (and salts).
6. The method for producing a urea-based chelating agent according to claim 1, wherein in step 1, the alkali is added to the mixture of the raw material a and water, and after stirring the mixture uniformly, the raw material B is added.
7. The method for producing a carbamido chelating agent according to claim 1, wherein the water is added in an amount of 30-70 wt% of the total reaction system; according to the material quantity ratio, when the raw material A is added in 2 standard parts and the raw material B can generate urea (carbamide) through hydrolysis, alkaline hydrolysis and acidolysis, the adding quantity is 0.8-1.2 parts; the heating temperature is from 55 ℃ to boiling reflux temperature.
8. The method for producing a carbamido chelating agent according to claim 1, wherein the water is added in an amount of 30-70 wt% of the total reaction system; according to the quantity proportion of substances, when the raw material A is added in 1 standard part and the raw material B can generate the compound shown by the general formula (II) and the ester, amide and salt thereof through hydrolysis, alkaline hydrolysis and acid hydrolysis, the adding quantity is 0.8-1.2 parts; the heating temperature is from 55 ℃ to boiling reflux temperature.
9. The production device of the carbamido chelating agent is characterized by comprising a reaction device (1), a temperature adjusting device (2), a detection device (3) and a liquid feeding device (4);
the reaction device (1) comprises a reactor (11) and a stirrer (12), wherein a solid feeding hole (111), a liquid feeding hole (112) and a discharging hole (113) are formed in the reactor (11), the solid feeding hole (111) is formed in the upper portion of the reactor (11), the liquid feeding hole (112) is formed in the upper portion of the reactor (11), and the discharging hole (113) is formed in the lower portion of the reactor (11); the stirrer (12) is arranged on the reactor (11) and used for promoting the materials in the reactor (11) to be uniformly mixed;
the temperature adjusting device (2) is arranged on the reactor (11), the temperature adjusting device (2) adopts at least one of a jacket, a coil and an electric heating device, the jacket and the coil exchange heat with materials in the reactor (11) through an internal heating medium, and the heat exchange comprises heating and cooling;
the detection device (3) comprises a thermometer (31), the thermometer (31) is arranged on the reactor (11) and is used for measuring the internal temperature of the reactor (11);
the liquid feed device (4) comprises a liquid storage tank (41); the outlet of the liquid storage tank (41) is connected with the liquid feeding hole (112).
10. The apparatus for producing a urea-based chelant according to claim 7 wherein the reaction apparatus (1) employs at least one of a tubular reactor and a tank reactor.
11. The apparatus for the production of urea-based chelant according to claim 7, wherein the detection device (3) further comprises a level gauge (33), the level gauge (33) being arranged on the liquid tank (41) for measuring the level inside the liquid tank (41).
12. The apparatus for producing a urea-based chelant according to claim 9, wherein the level gauge (33) is linked to the valve opening at the liquid feed inlet (112);
the thermometer (31) is connected and locked with the switch of the temperature adjusting device (2);
when the temperature adjusting device (2) adopts a jacket and a coil, the thermometer (31) is connected with the opening of an outlet and an inlet valve of the temperature adjusting device (2) and automatically controls the temperature by automatically adjusting the opening of the valve;
when the temperature adjusting device (2) adopts an electric heating device, the temperature measuring device is connected with the heat exchange device in a current locking way, and the temperature is automatically controlled by automatically adjusting the current.
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