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CN-117815688-B - Processing equipment for producing dimethylformamide water solvent

CN117815688BCN 117815688 BCN117815688 BCN 117815688BCN-117815688-B

Abstract

The invention relates to processing equipment for producing a dimethylformamide water solvent, and aims to solve the technical problem of low utilization rate of unreacted substances in the current production and preparation process of the dimethylformamide water solvent. The invention is provided with two heating plates which can perform heating operation, and the heating temperatures of the two heating plates are different, wherein the heating plate at the upper end has a production temperature higher than that of dimethylamine raw material vaporization value and lower than that of methanol raw material vaporization value in use, and the heating plate at the lower end has a production temperature higher than that of methanol raw material vaporization value and lower than that of formic acid raw material vaporization value in use, so that the mixed solution of unreacted reactants in the preparation of the dimethylformamide aqueous solvent can be distilled and separated to collect formic acid, dimethylamine and methanol in a layered manner, thereby being convenient for reuse, effectively reducing the waste condition of the mixed solution of the unreacted reactants in the preparation of the dimethylformamide aqueous solvent, and improving the utilization rate.

Inventors

  • LIN LI
  • JIN XIUQIANG

Assignees

  • 温州市嘉力新材料有限公司

Dates

Publication Date
20260505
Application Date
20231229

Claims (5)

  1. 1. The processing equipment for producing the dimethylformamide water solvent is characterized by comprising a base (1), a rectifying reaction kettle (2), a multi-stage distillation structure (3) and a cooling tank (4); the rectification reaction kettle (2) is arranged on the base (1); the multistage distillation structure (3) is arranged at one side of the rectification reaction kettle (2); The cooling tank (4) is arranged on one side of the multistage distillation structure (3) far away from the rectifying reaction kettle (2), and the cooling tank (4) is communicated with the input end of the multistage distillation structure (3) through a suction circulation pipeline (5), and the cooling tank (4) is communicated with the output end of the multistage distillation structure (3) through a pump feeding component (6); The base (1), the rectifying reaction kettle (2), the multistage distillation structure (3), the cooling tank (4), the suction circulation pipeline (5) and the pumping assembly (6) form a multistage distillation separation structure; the multistage distillation structure (3) comprises a main circulation tank body (11), an unreacted spiral pipeline (7), a classification reaction sleeve (8), a heating disc (9) and a condensation pipeline (10); The main circulation tank body (11) is arranged at one side of the rectification reaction kettle (2), and an integral condensation cavity is formed by the internal clearance of the main circulation tank body (11); the unreacted spiral pipeline (7) is arranged in the main circulation tank body (11) in a penetrating way and connected with the rectifying reaction kettle (2), wherein the distilled gas discharge end of the rectifying reaction kettle (2) is communicated with the output end of the unreacted spiral pipeline (7); The grading reaction sleeve (8) is arranged below the unreacted spiral pipeline (7), and three operation cavities are formed in the grading reaction sleeve (8) in an upper-lower order in a clearance mode; the heating plates (9) are arranged in two operation cavities which are oppositely positioned at the upper end; the condensation pipeline (10) is arranged in the grading reaction sleeve (8) in a penetrating way; Annular protrusions (801) are fixedly arranged in the two operation cavities which are oppositely arranged at the upper ends; wherein the heating plate (9) is arranged on the annular bulge (801), and the two operation cavities which are opposite to each other and positioned at the upper end are separated into an evaporation cavity and a confluence cavity through a gap of the heating plate (9); The evaporation cavity is positioned at the high end in the operation cavity, and a conical protrusion (802) extending downwards is arranged at the position, opposite to the center of the annular protrusion (801), of the high end of the evaporation cavity; The flow converging cavity is positioned at the lower end in the operation cavity, the bottom of the flow converging cavity is provided with a flow distributing and converging plate (803) with an arc-shaped structure, and the flow distributing and converging plate (803) is in a shape with a high middle end and a short side; The heating plate (9) is of an annular structure, heating wires are uniformly arranged in the heating plate (9), a plurality of extending protrusions (902) are arranged on the inner wall of the heating plate (9) in an annular equidistant mode, leakage holes (903) are formed between two adjacent extending protrusions (902) and the annular protrusions (801), the surface of the heating plate (9) is in a radial shape from the center to the outside, a plurality of contact protrusions (901) are arranged on the upper surface of the heating plate (9) in an annular equidistant mode, guide channels are formed between two adjacent contact protrusions (901) in an intermittent mode, the guide channels are in one-to-one correspondence with the leakage holes (903), and the guide channels are communicated with the converging cavities through the leakage holes (903).
  2. 2. The processing apparatus for producing an aqueous dimethylformamide solvent according to claim 1, wherein the unreacted spiral duct (7) is constituted by a communication connection portion (7011), a spiral portion (7012), and an annular portion (7013), wherein the communication connection portion (7011), the spiral portion (7012), and the annular portion (7013) are sequentially communicated with the classification reaction sleeve (8).
  3. 3. The processing apparatus for producing an aqueous dimethylformamide solvent as set forth in claim 2, wherein each of said operation chambers is provided with an integrally processed connecting duct extending upward from the outside thereof, and wherein each of said three operation chambers is communicated with each other through an integrally processed connecting duct, and wherein one of the operation chambers located at the opposite upper end is communicated with said annular portion (7013) through an integrally processed connecting duct, wherein the integrally processed connecting duct is provided with a communication passage in a spiral shape inside thereof.
  4. 4. A processing plant for the production of dimethylformamide aqueous solvent according to claim 3, characterized in that the integral treatment connection ducts are arranged uniformly on the side of the distribution manifold plate (803).
  5. 5. The processing apparatus for producing dimethylformamide water solvent as claimed in claim 4, wherein the condensing duct (10) is composed of a main circulation duct (1001) and a branch condensing duct (1002), wherein the main circulation duct (1001) is formed in an L-shape penetrating into the classification reaction sleeve (8), and an output end of the main circulation duct (1001) is connected with the pumping assembly (6), two groups of branch condensing ducts (1002) are sequentially arranged in the two operation chambers at opposite upper end positions, and the branch condensing duct (1002) is composed of a plurality of sub connecting ducts distributed in an annular equidistant manner, wherein the sub connecting ducts are adapted in shape to the tapered protrusions (802), and the sub connecting ducts are communicated with the main circulation duct (1001).

Description

Processing equipment for producing dimethylformamide water solvent Technical Field The invention relates to the technical field of dimethylformamide water solvent production, in particular to processing equipment for producing dimethylformamide water solvent. Background Dimethylformamide is a colorless transparent liquid which has a strong pungent odor and is excellent in solubility, and can dissolve many organic substances such as alcohols, ketones, esters, ethers, etc. It has a small solubility in water but good solubility in organic solvents. In addition, the dimethylformamide also has lower vapor pressure and higher flash point, and is not inflammable and explosive. Dimethylformamide is widely used in industry as an organic solvent, a reaction medium, an extractant, and the like. Because of its excellent solubility properties, it is commonly used in the preparation of paints, adhesives, dyes, inks and other chemicals. In addition, dimethylformamide is also commonly used in the pharmaceutical industry for the synthesis and extraction of pharmaceuticals. However, dimethylformamide has a certain toxicity, can have a stimulating effect on skin, eyes and respiratory tract, and can cause liver and kidney injury after long-term contact. Accordingly, when dimethylformamide is used, corresponding protective measures such as wearing protective clothing, wearing chemical protective glasses, and breathing apparatus are required. In summary, dimethylformamide is an important organic solvent, having excellent solubility properties and a wide range of application fields. When in use, the safety problem needs to be paid attention to, and proper protective measures are taken to avoid harm to human bodies and the environment. The specific preparation flow of the dimethylformamide water solvent is as follows: raw material preparation, namely preparing a proper amount of raw materials such as formic acid, dimethylamine, methanol and the like according to production requirements. These materials generally need to be mass checked to ensure purity and reliability. Mixing and stirring, namely mixing formic acid, dimethylamine and methanol together according to a certain proportion, and adding the mixture into a reaction kettle. Then the stirrer is started to fully and uniformly mix the materials. Heating reaction, namely raising the temperature in the reaction kettle to a proper reaction temperature by a heating system, and usually about 100 ℃. In the heating process, the materials start to react chemically to generate the dimethylformamide water solvent. And (3) reduced pressure distillation, namely, after the reaction is finished, reducing the pressure in the reaction kettle to a normal pressure state, and performing distillation operation. The water in the solvent and the unreacted methanol and other impurities can be separated by distillation, so that the dimethylformamide water solvent with higher purity is obtained. Cooling and collecting, namely cooling distilled dimethylformamide water solvent to reduce the temperature to a proper storage temperature. The solvent is then collected by a collection system into a storage container for subsequent packaging and transport. Quality detection, namely, in the production process, the quality detection of the dimethylformamide water solvent is carried out, so that the dimethylformamide water solvent meets relevant standards and customer requirements. Quality testing includes testing for physical properties, chemical properties, and impurity levels. Packaging and transporting, namely properly packaging the qualified dimethylformamide water solvent, and transporting according to the requirements of customers to finish the production process. In the prior art, the dimethyl formamide aqueous solvent and the unreacted substances are respectively produced by a distillation mode, and conventionally, formic acid, dimethylamine and methanol in the unreacted substances are synchronously separated from the dimethyl formamide aqueous solvent by one-time high-temperature distillation, so that the purity of the dimethyl formamide aqueous solvent is improved, and only the mixture of the formic acid, the dimethylamine and the methanol can be extracted by the existing one-time distillation mode, so that the utilization rate is reduced. Disclosure of Invention The invention aims to overcome the defects of the prior art, adapt to the actual needs, and provide processing equipment for producing a dimethylformamide water solvent, so as to solve the technical problem of low utilization rate of unreacted substances in the current production and preparation process of the dimethylformamide water solvent. The technical scheme includes that processing equipment for producing dimethylformamide water solvent is designed and comprises a base, a rectifying reaction kettle, a multistage distillation structure and a cooling tank groove, wherein the rectifying reaction kettle is arranged on the base, the multist