N-methyl-2-pyrrolidone synthetic method

N-methylpyrrolidone (NMP) is a high boiling point solvent with excellent thermal properties. It has strong polarity, inertness, low viscosity, strong solubility, good stability, no corrosion, and low volatility. Other solvents were replaced in the process route. Its production process can adopt 7-butyrolactone and methylamine condensation line, which is a reliable and mature process production line at present. The manufacturers are almost the same, but the main difference is the production method of monobutyrolactone intermediate. BASF company developed 1,4-butanediol (1,4-BDO) dehydrogenation to 7-butyrolactone, and then with methylamine The production method of condensation NMP, Japan's Mitsubishi Chemical Co., Ltd. uses maleic anhydride hydrogenation to produce 7-butyrolactone, by the route of condensation to NMP, and also has a production device. The raw material cost of 1,4-BDO is relatively high. The cost of producing 1,4-BDO by the Reppe process is 35 higher than that of the maleic anhydride produced by the butane oxidation process. This is the biggest weakness. . The cost of 7-butyrolactone produced by high pressure hydrogenation of maleic anhydride is difficult to compete with the 1,4-BDO dehydrogenation route. Recently, BASF in Germany used 7-butyrolactone and mixed methylamine as raw materials to produce N-methylpyrrolidone in a continuous process. This method can produce high-purity products. The 1,4-BDO dehydrogenation method for the production of 7-butyrolactone is relatively mature, the product yield is high, the process has no special requirements, the catalyst is easy to make, and the service life is long. Both BASF and GAF companies are 1,4-BDO manufacturers, and 1,4-BDO is used to produce 7-butyrolactone and N-methylpyrrolidone, which are downstream products with high comprehensive economic benefits.

The effect of water on hydrolysis of N methyl pyrrolidone

At room temperature, due to the formation of hydrogen bonds between N-Methyl-2-Pyrrolidone and water, the hydrolysis rate of NMP is about 1%, and at high temperatures due to the destruction of hydrogen bonds, the hydrolysis rate of NMP remains at about 2.5%, so when only water is present in NMP The hydrolysis rate is small at both high temperature and room temperature. After adding NaOH, in the NMP containing NaOH solution at room temperature, water inhibits the hydrolysis of NMP to a certain extent, but after a certain amount, due to dissolution Partially non-ionized NaOH, the alkaline environment reduces the activation energy required for NMP to break the C-N bond, thereby intensifying the hydrolysis of NMP.

Through orthogonal experiments, it was found that because NMP hydrolysis needs to break the C-N bond to open the ring and needs to absorb energy, the temperature has the greatest impact on NMP hydrolysis.Secondly, the activation energy of NMP hydrolysis is reduced due to the alkaline environment caused by NaOH. NMP can achieve a higher hydrolysis rate at lower temperatures; the smallest factor that affects NMP hydrolysis is water.The formation of hydrogen bonds between water and NMP at low temperatures plays a role in protecting NMP, but at the high temperature, the presence of NaOH solution Under the influence of hydrogen bonds, the hydrolysis rate of NMP rises.

Application of poly vinyl pyrrolidone in cosmetics

In addition to being used in hair cosmetics, poly vinyl pyrrolidone can also be used in skin care moisturizers, cream-based hair dye dispersants, and foam stabilizers in cosmetics. Because of its good moisturizing properties, it is widely used in the manufacture of skin care agents, cleansing agents, shampoos, toothpaste, etc. 

The skin care agent made of Polyvinylpyrrolidone can kill the virus and prevent wrinkles. It can effectively extend the penetration and retention time in cosmetics, which can be used for skin moisturizing and skin care. PVP is used in lipsticks, eye shadows, and mascara to reduce skin irritation caused by pigments and certain ingredients. PVP used in soaps can improve the sticking strength of bar soap. In sanitary soaps, Polyvinylpyrrolidone (PVP) can form complexes with fungicides to reduce skin irritation. PVP is used in liquid detergents to prevent cross-coloring and anti-redeposition, and to prevent skin irritation caused by synthetic detergents. For example, a liquid detergent formulation is: sodium alkylbenzene sulfonate 10.0% (mass fraction, the same below); surfactant 5.6; PVP 0.7%; sodium tripolyphosphate 12.0; Potassium silicate 4. O%; potassium xylene sulfonate 5. O%; water 62.7%. In addition, PvP used in enzyme-based laundry detergents, as both an adjuvant and a binding agent and stabilizer, can prevent the enzyme from being damaged by moisture and sodium percarbonate.

Is Polyacrylamide A Dangerous Chemical

Many customers or purchasers do not know about polyacrylamide products when they buy them. In addition to asking the price, there will be many questions. For example, the product specification, type, index, etc., among which the most question is whether polyacrylamide belongs to the dangerous chemicals?

First of all, is it harmful to human body? I hope I can help you by explaining these questions. Polyacrylamide product appearance is white powder, soluble in water, almost insoluble in benzene, ether, ester, acetone and other general organic solvents, its aqueous solution is almost transparent thick liquid, non-hazardous, non-toxic, non-corrosive. After entering the human body, polyacrylamide is mostly eliminated from the body in a short time, rarely absorbed by the digestive tract, so it is not toxic. Most commodities also do not irritate the skin, with only some water disintegrating likely to have residual alkali, which can irritate when exposed repeatedly and over a long period of time.

The U.S. food and drug administration considers PAM and its water breakup to be low toxicity or nontoxic. The toxicity of PAM comes from the residual acrylamide monomer and toxic metal during production. Acrylamide is a kind of neurotoxic agent that can damage the nervous system. Therefore, the health departments of all countries have stipulated the content of acrylamide remaining in industrial products of polyacrylamide, generally 0.5-0.05%. The content of acrylamide should be less than 0.2% when applied to the general purification treatment of water, and less than 0.05% for direct drinking water treatment. Currently, it is generally stipulated in major European and American countries that the residual acrylamide content in drinking water treatment and food is less than 0.05%, and the amount of PAM is strictly controlled. For flocculation of drinking water treatment, food grade products should be used as appropriate. Select food grade quality, low residual value of polyacrylamide products, can ensure the health and safety of drinking water.

Polyacrylamide in the use of water treatment process, the advantage of its strengthening flocculation and filtration processability, improving water quality, increase water quantity, cost savings are accepted by more and more water supply enterprises. Polyacrylamide applied in the field of drinking water treatment is being developed constantly, its prospects are very positive. So polyacrylamide is not belonged to the dangerous chemicals. Transportation is unregulated.

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A cost-saving method for the use of polyacrylamide

Polyacrylamide is a linear polymer, widely used in water treatment, paper, mineral processing, oil fields, etc., but the price of PAM is more expensive in the current market, so polyacrylamide need to save the use, how to reduce the cost of PAM?
1. To save cost in the use of polyacrylamide, we first need to choose the model of polyacrylamide, the principle is to choose the best effect of their own wastewater treatment. Expensive polyacrylamides are not necessarily suitable for their own factory wastewater treatment, and the cheaper one maybe lead to the treatment of wastewater effect is poor, but will increase the cost.

2.  Polyacrylamide is generally solid particles, the use of a solution that needs to be configured into a certain solubility, the concentration is usually between 0.1% and 0.3%, too thick or too thin will affect the effect, waste agents, increase the cost.
3. When the polyacrylamide is in an aqueous solution, it usually takes 30 to 50 minutes for the polyacrylamide to fully dissolve, a suitable stirring device is required for the solution, and if the temperature is low, the solution time is increased.

Marketing Center: Room 603, RuiYing Building, Chengnan 1st Road, Dali Town, Nanhai District, Foshan City, Guangdong Province,China, 528231

Factory: Area A No.9, Technology Park, Sanshui District, Foshan, Guangdong, China

Tel : +86 13929123248

Email : exp006@broviecn.com

Fax : 0086-0757-85510580

Website : http://www.bv-chem.com

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