Equipment for post-treatment of low-melting-point active compound

Abstract

The utility model provides equipment for post-treatment of low-melting-point technical materials, which comprises a preheater, a falling-film evaporator and a stirring kettle which are sequentially communicated, and is characterized in that the stirring kettle is provided with an outlet pipeline communicated with a crusher, the crusher is provided with a discharge pipe communicated with a stock bin, and the discharge pipe is provided with a crushing ventilator; and a fin cooler is arranged at the air inlet of the crushing ventilator. The utility model has the beneficial effects that the production device is optimized, the solidification process can reduce the defects of loose internal structure and insufficient strength of the product, so that the qualified rate of the product is improved, the physical and chemical stability is better, the performance can be maintained for a longer time under the normal use condition, and the yield of the processed raw medicine is prolonged.

Description

Technical Field

[0001] This utility model relates to the technical field of raw material processing devices, specifically to a device for post-processing of low-melting-point raw materials. Background Technology

[0002] Currently, agrochemical companies pursue rapid delivery in the production of active ingredients, and production lines are gradually expanding to larger tonnages. However, during the off-season, these production lines are idle, leading to increased initial investment costs and high equipment depreciation. Therefore, it is necessary to design a production line that can be used to produce multiple products, either as a whole or in parts.

[0003] In the refining process of high-boiling-point, low-melting-point active pharmaceutical ingredients, crystallization easily encapsulates the solvent; while distillation makes it difficult to form a gas phase in the bottom of the distillation column. Therefore, batch distillation kettles or continuous evaporators with 2 to 3 stages are generally used. For example, Chinese utility model patent application with publication number CN203609891U.

[0004] There are many technical materials with high boiling points and low melting points. Those with melting points <50℃ are repackaged after solvent removal to meet standards, such as thiocarbamate herbicides, metolachlor, clethodim, and butachlor. Those with melting points between 50℃ and 100℃ are generally dried using slicing or flake-forming machines, such as atrazine, prochloraz, and fenoxyfen. High-melting-point materials (>100℃) are more often dried using intermittent feeding rake dryers, continuous feeding cyclone flash dryers, or spray drying. Low-melting-point materials are prone to overheating and oil formation, causing material to stick to the walls and clog subsequent bag filters.

[0005] High-boiling-point, low-melting-point active ingredients are granulated using a granulator. The material drips from a tubular distributor onto a steel belt. If the droplets are too small, they form a layer of material resembling fish scales, which is almost impossible to scrape off the steel belt. If the droplets are too large, they form small, dome-shaped particles, wasting the effective area of ​​the steel belt, and the material is not completely solidified inside. Utility Model Content

[0006] To address the issue of insufficient product solidification leading to liquid trapping and subsequent non-compliance with performance indicators;

[0007] This utility model provides a device for post-processing of low-melting-point active ingredients, including a preheater, a falling film evaporator and a stirred tank connected in sequence. The stirred tank is provided with an outlet pipe connected to a pulverizer, the pulverizer is provided with a discharge pipe connected to a silo, the discharge pipe is provided with a pulverizing fan, and the air inlet of the pulverizing fan is provided with a finned cooler.

[0008] As a preferred embodiment, a screw feeder is provided between the outlet pipe and the crusher.

[0009] As a preferred embodiment, a buffer tank is provided between the falling film evaporator and the stirred tank.

[0010] As a preferred embodiment, the inlet pipe of the preheater is equipped with a falling film feed pump.

[0011] As a preferred embodiment, the inlet pipe of the stirred tank is equipped with a melt feed pump.

[0012] As a preferred embodiment, the screw feeder and the crusher are provided with jackets, with steam heating ports inside the jackets and condensate discharge ports at the bottom of the jackets.

[0013] As a preferred embodiment, the falling film evaporator is equipped with a removable distributor.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. This utility model optimizes the production equipment, which reduces defects such as loose internal structure and insufficient strength in the product during the solidification process, thereby improving the product qualification rate, giving it better physical and chemical stability, maintaining its performance for a longer period of time under normal use conditions, and extending the yield of the processed raw material.

[0016] 2. This invention avoids the problem of uneven internal structure of the raw material due to insufficient coagulation, which could affect its performance, by adding a stirring device. By solving the coagulation problem, it can ensure that each batch of raw material has consistent performance. Attached Figure Description

[0017] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein...

[0018] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0019] The numbers in the attached diagram are:

[0020] P11-Falling film feed pump, E11-Preheater, E12-Falling film evaporator, V11-Buffer tank, R11-Agitator, B11-Pulverizer fan, P12-Melting feed pump, R12-Screw feeder, S12-Pulverizer, E13-Fin cooler, V13-Hopper. Detailed Implementation

[0021] To illustrate the features of this utility model, the following description, in conjunction with the accompanying drawings and embodiments, will further explain this utility model.

[0022] Example:

[0023] Please see Figure 1This utility model provides a device for the post-processing of low-melting-point technical materials, comprising a preheater E11, a falling film evaporator E12, and a stirred tank R11 connected in sequence. The stirred tank R11 has an outlet pipe connected to a pulverizer S12, and the pulverizer S12 has a discharge pipe connected to a silo V13. A pulverizing fan is installed on the discharge pipe, and a finned cooler E13 is installed at the air inlet of the pulverizing fan to further enhance the cooling effect. A screw feeder R12 is installed between the outlet pipe and the pulverizer S12. The screw feeder R12 and the pulverizer S12 are jacketed, with a steam heating port inside the jacket and a condensate discharge port at the bottom of the jacket. By using a jacketed screw feeder and pulverizer, and introducing cooling media into the jackets of both devices, the heat generated by material solidification and pulverization is removed. Furthermore, the jacket of the stirred tank R11 is circulated with a heating medium, serving as a melting vessel for technical materials with a melting point of 50~100℃. The heating and cooling media within the jacket of the stirred tank are switched via a shut-off valve.

[0024] Preferably, a buffer tank V11 is provided between the falling film evaporator E12 and the stirred tank R11.

[0025] Preferably, the inlet pipe of the preheater E11 is equipped with a falling film feed pump P11.

[0026] Preferably, the inlet pipe of the mixing vessel R11 is equipped with a melt feed pump P12, thereby improving the system operating efficiency by adding a pump to a key pipeline.

[0027] Preferably, the falling film evaporator E12 is equipped with a removable distributor.

[0028] In this embodiment, the phenoxyacetic acid methanol solution is preheated to 110~120℃ by the preheater E-11 and then enters the first-stage falling film evaporator E-12 for desolventizing. The methanol vapor phase is recovered after two-stage condensation to 45~50℃. The technical grade product with acceptable methanol residue is temporarily stored in V-11 and then transferred to the melting kettle R-11 by the jacketed pump P-12. The temperature of the melting kettle R-11 is controlled at 100~195℃. The molten liquid is discharged to the screw feeder R-12 and then pushed to the pulverizer S-12. The pulverizer fan B11 blows in air cooled by the finned cooler E13 to transport the powder to the silo V-13 for weighing and bagging.

[0029] The above embodiments and accompanying drawings are only used to illustrate the technical solutions of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions, or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model. Other related technical structures not disclosed in detail in this utility model are existing technologies in the art.

Claims

1. An apparatus for post-processing of low-melting-point technical materials, comprising a preheater (E11), a falling film evaporator (E12), and a stirred tank (R11) connected in sequence, characterized in that: The mixing vessel (R11) is equipped with an outlet pipe that connects to the crusher (S12), the crusher (S12) is equipped with a discharge pipe that connects to the hopper (V13), the discharge pipe is equipped with a crushing fan (B11), and the air inlet of the crushing fan (B11) is equipped with a finned cooler (E13).

2. The equipment for post-processing of low-melting-point technical materials according to claim 1, characterized in that: A screw feeder (R12) is provided between the outlet pipe and the crusher (S12).

3. The equipment for post-processing of low-melting-point technical materials according to claim 1, characterized in that: A buffer tank (V11) is provided between the falling film evaporator (E12) and the stirred tank (R11).

4. The equipment for post-processing of low-melting-point technical materials according to claim 1, characterized in that: The inlet pipe of the preheater (E11) is equipped with a falling film feed pump (P11).

5. The equipment for post-processing of low-melting-point technical materials according to claim 1, characterized in that: The inlet pipe of the stirred tank (R11) is equipped with a melt feed pump (P12).

6. The equipment for post-processing of low-melting-point technical materials according to claim 2, characterized in that: The screw feeder (R12) and the crusher (S12) are equipped with jackets, with steam heating ports inside the jackets and condensate discharge ports at the bottom of the jackets.

7. The equipment for post-processing of low-melting-point technical materials according to claim 1, characterized in that: The falling film evaporator (E12) is equipped with a removable distributor.

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