N,N-Dimethylformamide, N,N-Dimethylformamide is a chemical, colorless and transparent liquid. It is not only a very versatile chemical raw material, but also a very versatile excellent solvent. Except for halogenated hydrocarbons, it can be mixed freely with water and most organic solvents. It has good solubility and chemical stability for a variety of organic and inorganic compounds.
Storage method
Storage precautions Store in a cool, ventilated warehouse. The storage temperature should not exceed 37℃. Keep away from fire and heat sources. Keep the container tightly closed. It should be stored separately from oxidants, reducing agents, halogens, etc., and avoid mixed storage. Use explosion-proof lighting and ventilation facilities. It is forbidden to use mechanical equipment and tools that are prone to sparks. The storage area should be equipped with leakage emergency treatment equipment and suitable storage materials.
Use
1. Dimethylformamide is a good solvent for a variety of polymers such as polyethylene, polyvinyl chloride, polyacrylonitrile, polyamide, etc., and can be used for wet spinning of synthetic fibers such as polyacrylonitrile fibers, and polyurethane Synthetic; used in plastic film making; also used as paint remover for removing paint; it can also dissolve some low-solubility pigments, giving the pigments the characteristics of dyes. Dimethylformamide is used for aromatic extraction and separation and recovery of butadiene from C4 fraction and isoprene from C5 fraction. It can also be used as an effective reagent for separating non-hydrocarbon components from paraffin. .
2. It has good selectivity to the solubility of isophthalic acid and terephthalic acid: the solubility of isophthalic acid in dimethylformamide is greater than that of terephthalic acid, and solvent extraction is carried out in dicarboxylic acid formamide. Or part of the crystallization can separate the two. In the petrochemical industry, dimethylformamide can be used as a gas absorbent to separate and refine gas.
3. In organic reactions, dimethylformamide is not only widely used as a solvent for the reaction, but also an important intermediate in organic synthesis. It can be used to produce insecticide in the pesticide industry.
4. Reagents for non-aqueous titration, solvents for vinyl resin and acetylene, organic synthesis, photometric determination, gas chromatography stationary liquid (maximum use temperature 50℃, solvent is methanol), separation and analysis of C2-C5 hydrocarbons, and can separate normal and isobutylene ] And cis and transbutene. Analysis of pesticide residues. Organic Synthesis. Synthesis of peptides. For the photographic industry.
5. An excellent solvent and chemical raw material with a wide range of uses. It is a good solvent for many kinds of polymers such as polyethylene, polyvinyl chloride, polyacrylonitrile, polyamide, etc. Can be used for wet spinning of synthetic fibers such as polyacrylonitrile fiber; synthesis of polyurethane; paint remover for removing paint; selective absorption of acetylene and separation and refining of butadiene; used as a solvent in the production of artificial leather; in pesticides Used to synthesize insecticides; in the pharmaceutical industry, it can be used to synthesize iodosamine, doxycycline, cortisone, vitamin B6, iodoside, ququjing, pyrantel, N-formyllysin, and antitumor acid , Methoxy mustard, chlorambucil, nitrosourea, furfurouracil, tranexamic acid, befenmethasone, megestrol, cholevitamin, chlorpheniramine and so on.
6. Used as a solvent and organic modifier in liquid chromatography, an extractant and developing agent for thin layer chromatography, a solvent for vinyl resin and acetylene, and a solvent for non-aqueous solvent titration. And used in organic synthesis.
7. Mainly used as industrial solvents, in the pharmaceutical industry for production, hormones, and also for the manufacture of insecticides.
Other considerations
(1) First aid measures
Skin contact: Take off contaminated clothing immediately and rinse with plenty of running water for 20-30 minutes. Seek medical attention if you feel unwell. Seek medical attention if you feel unwell.
Eye contact: Lift the eyelid immediately, and rinse thoroughly with a large amount of running water or normal saline for 10-15 minutes. Seek medical attention if you feel unwell.
Inhalation: quickly leave the scene to a place with fresh air. Keep the airway unobstructed. If breathing is difficult, give oxygen. Breathing and heartbeat stop, cardiopulmonary resuscitation should be performed immediately. Seek medical attention.
Ingestion: Drink enough warm water to induce vomiting. Seek medical attention.
(2) Fire fighting measures
Hazardous characteristics: flammable, exposed to open flames, high heat or contact with oxidants, there is a danger of burning and explosion. It can react violently with concentrated sulfuric acid and fuming nitric acid, and even explode. It can react strongly with halides (such as carbon tetrachloride).
Hazardous combustion products: carbon monoxide, nitrogen oxides.
Fire extinguishing method: use water spray, alcohol-resistant foam, dry powder, carbon dioxide, sand to extinguish the fire.
Precautions and measures for fire fighting: Fire fighters must wear gas masks and full-body fire fighting clothes, and put out fires in the upwind direction. Move the container from the fire scene to an open place as much as possible. Spray water to keep the fire container cool until the end of the fire extinguishing. If the container in the fire scene has changed color or produces sound from the safety relief device, it must be evacuated immediately.
(3) Leakage emergency treatment
Emergency action: Eliminate all ignition sources. According to the area affected by liquid flow and vapor diffusion, a warning zone shall be delineated, and unrelated personnel shall be evacuated from the crosswind and upwind direction to the safe area. It is recommended that emergency personnel wear positive pressure self-contained breathing apparatus and wear anti-static clothing. All equipment used during operation should be grounded. Do not touch or cross the spill. Cut off the source of leakage as much as possible. Prevent leaks from entering water bodies, sewers, basements or confined spaces. Small leakage: absorb with sand or other non-combustible materials. Use clean non-sparking tools to collect the absorbent material. A large number of leaks: build a dike or dig a pit for storage. Use fly ash or lime powder to absorb large amounts of liquid. Cover with alcohol-resistant foam to reduce evaporation. Water spray can reduce evaporation, but it cannot reduce the flammability of leakage in restricted spaces. Use explosion-proof pump to transfer to tank truck or special collector.
(4) Operation, disposal and storage
Operation precautions: airtight operation, full ventilation. Operators must undergo special training and strictly abide by the operating procedures. It is recommended that operators wear filter-type gas masks (half masks), chemical safety glasses, chemical protective clothing, and rubber gloves. Keep away from fire and heat sources, and smoking is strictly prohibited in the workplace. Use explosion-proof ventilation systems and equipment. Prevent the vapor from leaking into the air in the workplace. Avoid contact with oxidants, reducing agents, halogens, and acids. The flow rate of the filling should be controlled to prevent the accumulation of static electricity. When handling, load and unload with care to prevent damage to packaging and containers. Equipped with corresponding types and quantities of fire-fighting equipment and leakage emergency treatment equipment. Empty containers may be harmful residues.
Storage precautions: Store in a cool, ventilated warehouse. The storage temperature should not exceed 37℃, keep away from fire and heat sources. Keep the container tightly closed. It should be stored separately from oxidants, reducing agents, halogens, etc., and avoid mixed storage. Use explosion-proof lighting and ventilation facilities. It is forbidden to use mechanical equipment and tools that are prone to sparks. The storage area should be equipped with leakage emergency treatment equipment and suitable storage materials.
(5) Personal protection
The production process is closed, fully ventilated, and safety showers and eyewashing equipment are provided; when the concentration in the air exceeds the standard, wear a filter gas mask (half mask); wear chemical safety glasses; wear chemical protective clothing; wear rubber gloves; smoking is strictly prohibited at the work site; After work, take a shower.
(6) Disposal
Nature of waste: hazardous waste
Waste disposal method: Dispose by incineration. After being mixed with fuel, it is incinerated. The nitrogen oxides discharged from the incinerator are removed by scrubbers.
Disposal precautions: Please refer to relevant national and local regulations before disposal. Return the emptied container to the manufacturer or bury it in a designated place.