Glyphosate mother liquor distillation light component removal device
By combining a distillation unit and a dilute sulfuric acid absorption tower in the distillation process of glyphosate mother liquor, the problem of unremoved light components such as ammonia and methanol in the top distillate of the tower was solved, thereby improving the efficiency and quality of glyphosate production.
Patent Information
- Application Number
- CN202423012347.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2025-10-24
- Estimated Expiration
- 2034-12-06
AI Technical Summary
In the current glyphosate production process, light components such as ammonia and methanol in the triethylamine distillate at the top of the tower cannot be effectively removed, affecting production efficiency and quality.
A coupled distillation unit is used, and light components such as ammonia and methanol are removed by staged condensation and reflux, combined with a dilute sulfuric acid absorption tower. The separation is achieved efficiently using sieve plates or packed towers.
This technology enables the efficient removal of ammonia and methanol from triethylamine, ensuring the quality of triethylamine that can be reused and improving the efficiency and safety of glyphosate production.
Smart Images
Figure CN223464447U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to glyphosate preparation technical field, concretely relates to a kind of glyphosate mother liquor distillation light removal device. BACKGROUND
[0002] In the production process of glyphosate, the glyphosate mother liquor is adjusted to PH above 8 by adding liquid alkali, and then stratifies, the upper "oil phase" is triethylamine, and the lower water phase is aqueous solution containing a small amount of ammonia, methanol, triethylamine, glyphosate, phosphine and other derivatives, etc. In the preparation process, the lower water phase is usually simply distilled by distillation column, and the distillation liquid containing triethylamine at the top of the column enters the settling tank; the material in the column kettle enters the phosphorus salt treatment system. The distillation liquid at the top of the column is stratified by standing, the upper triethylamine enters the dehydration system for treatment and then is recycled and used, and the cycle is repeated. Among them, the distillation liquid containing triethylamine at the top of the column contains components such as ammonia, methanol and triethylamine, after stratification by settling, a small part of light components such as ammonia and methanol are dissolved in the water phase, and most of them are dissolved in triethylamine, which is recycled and used in the production device, without an outlet for removal, which brings negative effects such as reduction of efficiency, safety and quality fluctuation to the production of glyphosate.
[0003] Therefore, how to provide a glyphosate mother liquor distillation light removal device for efficiently removing light components such as ammonia and methanol has become a problem that needs to be considered by those skilled in the art. CONTENT OF UTILITY MODEL
[0004] Therefore, the utility model provides a kind of glyphosate mother liquor distillation light removal device, the utility model is coupled rectifying device, and light components such as ammonia and methanol are removed by fractional condensation and reflux means, so that the triethylamine aqueous solution of distillation column discharge contains as little light components as possible, such as ammonia and methanol, so that the triethylamine returned for use no longer contains ammonia and as little light components as possible, such as methanol, to avoid affecting production effect.
[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:
[0006] A glyphosate mother liquor distillation light removal device, comprising a distillation column, the distillation column is connected with a rectifying device, the rectifying device is a rectifying column, the rectifying column is provided with a gas phase feed port and a liquid phase feed port, and is respectively provided with a bottom outlet and a top outlet, the top of the distillation column is provided with a first condenser, the gas phase outlet of the first condenser is communicated with the gas phase feed port, the liquid phase outlet of the first condenser is communicated with the liquid phase feed port, the bottom of the distillation column is communicated with a liquid alkali settling tank, the oil phase part of the liquid alkali settling tank is communicated with a dehydration system, and the water phase part of the liquid alkali settling tank is communicated with the distillation column through a circulation pipeline.
[0007] Further, it further comprises a dilute sulfuric acid absorption tower, which is communicated with the top outlet of the rectifying column.
[0008] Further, the kettle bottom of the rectification tower is provided with a reboiler, and the top is provided with a second condenser.
[0009] Further, the rectification tower is a sieve plate tower.
[0010] Further, the rectification tower is a packed tower.
[0011] The beneficial effects of the present application are as follows: the present application can remove light components such as ammonia and methanol through rectification and separation of the original glyphosate mother liquor distillation liquid, and the remaining kettle material can be returned for recovery after alkaline layering treatment. The device has low energy consumption and can ensure that the triethylamine does not contain ammonia as much as possible to avoid affecting glyphosate production. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 The present application is connected to a schematic diagram.
[0013] 1. distillation tower; 101. first condenser; 2. rectification tower; 201. second condenser; 202. reboiler; S2. gas phase feed inlet; S3. liquid phase feed inlet; S4. bottom outlet; S5. top outlet; 3. liquid alkali settling tank; 4. dehydration system; 5. sulfuric acid absorption tower. DETAILED DESCRIPTION
[0014] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.
[0015] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "horizontal", "inner", "outer", "one side" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application; the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0016] Example 1
[0017] As Figure 1As shown, the embodiment discloses a glyphosate mother liquor distillation light removal device, which comprises a distillation tower 1, the distillation tower 1 is connected with a rectification device, the rectification device in the embodiment is a rectification tower 2, the rectification tower 2 is provided with a gas phase feed inlet S2 and a liquid phase feed inlet S3, and is respectively provided with a bottom outlet S4 and a top outlet S5, the top of the distillation tower 1 is provided with a first condenser 101, the gas phase outlet of the first condenser 101 is communicated with the gas phase feed inlet S2, the liquid phase outlet of the first condenser 101 is communicated with the liquid phase feed inlet S3, the bottom of the distillation tower 1 is communicated with a liquid alkali settling tank 3, the oil phase part of the liquid alkali settling tank 3 is communicated with a dehydration system 4, the upper oil phase is dehydrated after entering a glyphosate production system, the water phase part of the liquid alkali settling tank 3 is communicated with the distillation tower 1 through a circulation pipeline, and the lower water phase is returned to the distillation tower for treatment.
[0018] As a preferred embodiment of the utility model, it further includes a dilute sulfuric acid absorption tower 5, which is communicated with the top outlet S5 of the rectification tower 2.
[0019] As a preferred embodiment of the utility model, the kettle bottom of the rectification tower 2 is provided with a reboiler 202, and the top is provided with a second condenser 201.
[0020] Specifically, the coupled rectification tower 2 in the embodiment is a sieve plate tower, the total number of tower plates is 8-20, the rectification section tower diameter is 200-1200 mm, the plate spacing is 100-800 mm, the opening rate is 4-20%, the reboiler 202 heat exchange area is 2-32 m 2 In the embodiment, the liquid phase feed is fed at the top end of the first tower plate, and the gas phase feed is fed at the fifth tower plate.
[0021] The process flow of the light component removing device is as follows: the temperature at the top of the glyphosate mother liquor distillation tower 1 is controlled to be above 92 DEG C, the gas phase at the top is partially condensed in the first condenser 101, the temperature of the condensed liquid is maintained at about 80 DEG C, the gas phase and the liquid phase enter the newly-built coupled rectification tower 2 respectively, and high separation coefficient rectification separation is carried out. Under the condition of cooling reflux, the temperature at the top of the rectification tower 2 is maintained at about 45 DEG C, and the temperature at the bottom of the tower is about 80 DEG C, so that the removal rate of ammonia nitrogen in the material at the bottom of the tower is greater than 90%. The non-condensable gas phase at the top enters the dilute sulfuric acid absorption tower 5 system, the absorption liquid is recycled, and can be used as a nitrogen source for biomass composting. The treatment method has been successfully tested; the condensed liquid is used for reflux, and whether to collect or not depends on the actual situation. The liquid at the bottom of the distillation tower 1 enters the alkaline environment of the liquid alkali settling tank 3, the upper oil phase triethylamine enters the dehydration system 4, enters the glyphosate production system, and is reused, and the lower water phase returns to the distillation tower 1 of the original process. Because the ammonia and part of the methanol dissolved in the triethylamine have been removed from the top of the rectification tower 2, the triethylamine separated by the liquid alkali settling tank 3 does not contain ammonia and methanol as much as possible, and recycling is more conducive to glyphosate production. After rectification by the utility model, the ammonia nitrogen in the triethylamine aqueous solution in the distillation tower bottom is removed by more than 90%.
[0022] Example 2
[0023] Another structure of the rectification tower 2 is given in the embodiment, the rectification tower 2 in the embodiment is a packed tower, the number of tower plates is about 9-38, the material (including packing) is 304 stainless steel, the diameter of the rectification tower 2 is 100-1300 mm, the length of the rectification section is 1-12 m, the length of the stripping section is 3-9 m, the reboiler 202 at the bottom of the rectification tower 2 has a heat exchange area of 11-32 m 2 , and the second condenser 201 at the top has a heat exchange area of 11-50 m 2 .
[0024] Although the specific embodiments of the utility model are described above in combination with the drawings, it is not a limitation on the protection scope of the utility model, and those skilled in the art should understand that various modifications or changes made by those skilled in the art on the basis of the technical solutions of the utility model without creative labor are still within the protection scope of the utility model.
Claims
1. A distillation light-ends removal apparatus for glyphosate mother liquor, characterized by, The distillation column is connected with a rectification device, which is a rectification column, and is provided with a gas phase feed inlet and a liquid phase feed inlet, and a bottom outlet and a top outlet respectively, the top of the distillation column is provided with a first condenser, the gas phase outlet of the first condenser is communicated with the gas phase feed inlet, the liquid phase outlet of the first condenser is communicated with the liquid phase feed inlet, the bottom of the distillation column is communicated with a liquid alkali settling tank, the oil phase part of the liquid alkali settling tank is communicated with a dehydration system, and the water phase part of the liquid alkali settling tank is communicated with the distillation column through a circulation pipeline.
2. The apparatus for removing light components from a glyphosate mother liquor by distillation according to claim 1, wherein A dilute sulfuric acid absorption tower is further included and is communicated with the top outlet of the rectification column.
3. The apparatus for removing light components from a glyphosate mother liquor by distillation according to claim 1, wherein The kettle bottom of the rectification column is provided with a reboiler, and the top is provided with a second condenser.
4. The apparatus for removing light components from a glyphosate mother liquor by distillation according to claim 1, wherein The rectification column is a sieve plate column.
5. The apparatus for removing light components from a glyphosate mother liquor by distillation according to claim 1, wherein The rectification column is a packed column.