DMF: NN -dimethylformamide
Dimethylformamide is not only a widely used chemical raw material, but also an excellent solvent with a wide range of uses. It can be used for wet spinning of synthetic fibers such as polyacrylonitrile fiber and the synthesis of polyurethane; it can be used to make plastic films; it can also be used as a paint stripper; it can also dissolve certain low-solubility pigments and make pigments with dye specialty.
Dimethylformamide is used for the extraction of aromatics and for the separation and recovery of butadiene from carbon four distillates and isoprene from the carbon five distillates. It can also be used as an effective reagent for separating non-hydrocarbon components from paraffin. . It has good selectivity for the solubility of isophthalic acid and terephthalic acid: the solubility of isophthalic acid in dimethylformamide is greater than that of terephthalic acid. Crystallization can separate the two. In the petrochemical industry, dimethylformamide can be used as a gas absorbent to separate and refine gases. In organic reactions, dimethylformamide is not only widely used as a reaction solvent, but also an important intermediate for organic synthesis.
DMAC: N, N -dimethylacetamide
Properties: density 0.937. Melting point: -20 ° C. The boiling point is 164-166 ° C. The refractive index is 1.437-1.439. Flash point is 66 ° C.
Dimethylacetamide has good solubility in many resins, especially polyurethane resins and polyimide resins. It is mainly used as a solvent for heat-resistant synthetic fibers, plastic films, coatings, medicine, and acrylonitrile spinning. At present, it is mostly used in the production of polyimide film, soluble polyimide, polyimide-polyperfluoroethylene propylene composite film, polyimide (aluminum) film, soluble polyimide molding powder, etc .; domestic Mainly used in polymer synthetic fiber spinning and other organic solvents with excellent polar solvents.
In organic synthesis, dimethylacetamide is an excellent catalyst, which can accelerate the reactions such as cyclization, halogenation, cyanation, alkylation and dehydrogenation, and can improve the yield of main products. In some pharmaceutical and pesticide production, dimethylacetamide can also be used as a solvent or cocatalyst. Compared with traditional organic solvents, it can improve product quality and yield.
DMSO: dimethyl sulfoxide
DMSO (dimethyl sulfoxide) is a sulfur-containing organic compound with a molecular formula of (CH3) 2SO. It is a colorless, odorless, transparent liquid at room temperature. It is a hygroscopic flammable liquid. It has the characteristics of high polarity, high boiling point, good thermal stability, aproton, and miscibility with water. It can dissolve in most organic substances such as ethanol, propanol, benzene, and so on, and is known as "solvent".
In the production process of acrylic, carbon fiber, leather, etc., these organic solvents are widely used as good solvents. The iPR online concentration meter is installed in the pipeline or tank to perform on-line measurement of DMF / DMAC / DMSO concentration. It can quickly know the concentration of the solution and control it within the appropriate concentration range according to the production process.
According to the different production standards adopted by each factory, the online concentration meter can set the type of output according to the needs of the user, such as directly describing the concentration of DMF / DMAC / DMSO as the refractive index, describing as a percentage, describing as a density, etc. .