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4-methyl-2-pentanol is an organic compound, also known as 1,3-Dimethyl-1-butanol, with the molecular formula C6H14O and CAS 108-11-2. A colorless and transparent liquid that is soluble in water and miscible with the most commonly used organic solvents such as alcohols, ethers, and hydrocarbons. Methyl isobutyl methanol (MIBC) is an excellent foaming agent for non-ferrous metals and non-metallic minerals. It is mainly used as foam agent to separate nonferrous metal oxide ore or fine sulfide ore with large mud content. Widely used in the beneficiation of lead-zinc ore, copper molybdenum ore, and copper gold ore worldwide, it is particularly effective in improving the quality of concentrates.
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Chemical Formula |
C6H14O |
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Exact Mass |
177 |
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Molecular Weight |
177 |
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m/z |
102 (100.0%), 103 (6.5%) |
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Elemental Analysis |
C, 70.53; H, 13.81; O, 15.66 |
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4-methyl-2-pentanol, also known as methyl isobutyl methanol (MIBC), is a colorless, transparent liquid with an aromatic odor. Its molecular structure contains a hydroxyl group (- OH) and an isopropyl branch, endowing it with unique solubility and chemical stability. As a secondary alcohol compound, it has demonstrated extensive application value in industries such as mining, daily chemical, and environmental protection.
It is an excellent medium boiling point solvent with a boiling point of 132-133.5 ℃ and a flash point of 40-41 ℃. It has moderate volatility and can quickly dissolve the target substance without causing coating cracking due to rapid evaporation. It has excellent solubility and can be mixed with water (with a solubility of about 2g/100ml at 20 ℃), and is miscible with most organic solvents such as alcohols, ethers, and hydrocarbons. This characteristic makes it a key raw material for the coatings, inks, and resin industries.
1. Paint industry
In nitrocellulose paint and synthetic resin varnish, as an inert solvent, it can adjust the viscosity of the coating and improve leveling. Its low surface tension characteristic (dynamic surface tension of about 30mN/m at 25 ℃) enables the coating to uniformly cover complex surfaces, reducing shrinkage and orange peel phenomena.
For example, a certain automotive coating company increased the glossiness of the paint film from 85 to 92 (60 ° angle) by adding 5% 4-methyl-2-pentnol, and shortened the drying time by 20%. In addition, it can also be used as a co solvent for nitrocellulose paint, compounded with solvents such as ethyl acetate and acetone to form an environmentally friendly coating system and reduce volatile organic compound (VOC) emissions.
2. Ink manufacturing
In printing ink, as a diluent, the viscosity of the ink can be adjusted to a suitable range (such as controlling the viscosity of offset printing ink at 12-18Pa · s). Its good solubility ensures even dispersion of pigments and prevents "ink pile up" or "through printing" issues during the printing process.
After a certain packaging and printing enterprise adopted its replacement of toluene, the ink drying speed increased by 15%, and the friction resistance of printed materials was significantly enhanced.
3. Resin and rubber processing
As a solvent for natural rubber and synthetic rubber (such as SBR, NBR), it can dissolve rubber particles and form a uniform adhesive solution, which is used to manufacture products such as adhesives and sealants. In resin processing, it can be used to dissolve thermosetting resins such as epoxy resin and phenolic resin, reduce system viscosity, and facilitate casting or impregnation processes. For example, a certain electronic component packaging company increased the fluidity of epoxy resin adhesive by 30% by adding 8% 4-methyl-2-pentnol, significantly improving production efficiency.
Mineral flotation: an efficient frother for metal extraction
Mineral flotation is a technology that utilizes the differences in physical and chemical properties of mineral surfaces to achieve separation, and foaming agents are key reagents in the flotation process. Due to its excellent foaming performance and selectivity, it has become the preferred foaming agent for flotation of copper, lead, zinc and other metal ores.
flotation mechanism
The hydroxyl group in the molecule of 4-methyl-2-pentnol can be adsorbed on the mineral surface to reduce the surface tension of water and form a stable foam layer. Its isopropyl branch chain provides spatial hindrance to prevent premature rupture of foam, thus prolonging the contact time between bubbles and mineral particles. Experimental data shows that adding 0.05kg/t of 4-methyl-2-pentanol in copper molybdenum ore flotation can increase the copper recovery rate from 82% to 88%, while increasing the concentrate grade by 2 percentage points.
Application Cases
Lead zinc ore flotation: after a lead-zinc ore concentrator used 4-methyl-2-pentnol instead of traditional terpineol oil, the flotation time was shortened by 20%, and the foam layer was more stable, and the lead and zinc grades in the concentrate were increased by 1.5% and 1.2% respectively.
Copper gold ore flotation: In copper gold ore flotation with high mud content, 4-methyl-2-pentnol can effectively disperse the mud and reduce its interference with the flotation process. A certain copper and gold mining enterprise increased the copper recovery rate from 78% to 85% and the gold recovery rate by 5 percentage points by optimizing the dosage of foaming agent.
Environmental advantages
Compared with traditional foaming agents such as pine oil and cresol acid, it has the characteristics of strong biodegradability and low toxicity. Its biodegradation rate (BOD ₅/COD) can reach over 0.6, which meets environmental protection requirements. In addition, it has low corrosiveness to equipment, can extend the service life of flotation machines, and reduce maintenance costs.
Lubricant additive: the "protector" of mechanical operation
Lubricant additives can improve the performance of lubricants and extend the service life of equipment. As a solvent based additive, it is mainly used in the preparation of lubricating oil detergent dispersants and anti-wear agents.
1. Clean dispersant
In lubricating oil, deposits such as carbon deposits and sludge can be dissolved to prevent the formation of paint or gum inside the engine. A certain lubricant company has developed an efficient detergent dispersant by compounding 4-methyl-2-pentnol with polyisobutene succinimide, which can reduce carbon deposits on the top of engine pistons by 60% and extend oil change intervals by 30%.
2. Anti wear agent carrier
As a solvent for anti-wear agents such as zinc dialkyldithiophosphate (ZDDP), it can improve the dispersibility of anti-wear agents in lubricating oil, ensuring their uniform coverage of metal surfaces. Experiments have shown that the addition of 5% 4-methyl-2-pentnol improves the anti-wear performance of lubricating oil (four ball machine test, load 196N, speed 1200r/min) by 20%, and reduces the wear spot diameter by 15%.
Lubricant additive: the "protector" of mechanical operation
Lubricant additives can improve the performance of lubricants and extend the service life of equipment. As a solvent based additive, it is mainly used in the preparation of lubricating oil detergent dispersants and anti-wear agents.
1. Clean dispersant
In lubricating oil, deposits such as carbon deposits and sludge can be dissolved to prevent the formation of paint or gum inside the engine. A certain lubricant company has developed an efficient detergent dispersant by compounding 4-methyl-2-pentnol with polyisobutene succinimide, which can reduce carbon deposits on the top of engine pistons by 60% and extend oil change intervals by 30%.
Widely used in the daily chemical industry, mainly for manufacturing cosmetics, detergents, fragrances and other products, its low toxicity and good skin compatibility make it a safe and reliable raw material.
1. Cosmetics manufacturing
Emulsifier: In lotion cosmetics (such as face cream and lotion), it can be used as a non-ionic surfactant to reduce the interfacial tension between oil and water and form a stable emulsion. A cosmetics enterprise increased the stability of face cream (centrifugal test, 3000r/min, 30min) from 85% to 95% by adding 2% of 4-methyl-2-pentnol, and the product texture was more delicate.
Plasticizer: In solid cosmetics such as lipstick and eye shadow, it can increase the flexibility and ductility of the product and prevent cracking. The experimental data shows that after adding 3% of 4-methyl-2-pentanol, the elongation at break of lipstick increases by 40%, and the use experience is better.
2. Detergent formula
As a dispersant and detergent, it can improve the ability of detergents to remove oil stains. In laundry detergent, it can be compounded with anionic surfactants such as sodium dodecylbenzenesulfonate to form a micelle structure, enhancing its emulsifying effect on stubborn stains. By optimizing the formula, a detergent enterprise controlled the consumption of 4-methyl-2-pentnol at 1.5%, which improved the detergency of the product by 15%, and the amount of foam was moderate and easy to rinse.
3. Spice synthesis
Flavors can be prepared through esterification reactions, such as 4-methyl-2-pentnol acetate (with banana aroma) and 4-methyl-2-pentnol benzoate (with jasmine fragrance). These spices are widely used in perfume, soaps and air fresheners, giving products unique fragrance. For example, a perfume brand uses 4-methyl-2-pentnol acetate as the main fragrance base to develop a best-selling perfume, with annual sales exceeding 100 million yuan.
Brake fluid is the core medium of the automotive braking system, and its performance directly affects driving safety. Due to its high boiling point, low hygroscopicity, and good chemical stability, it has become an important raw material for brake fluids.
1. Brake fluid formula
In DOT 3 and DOT 4 brake fluids, as an azeotrope, the boiling point range of the brake fluid can be adjusted (dry boiling point ≥ 205 ℃, wet boiling point ≥ 140 ℃) to prevent the formation of bubbles at high temperatures that may cause brake failure. A certain brake fluid company has optimized the formula to control the dosage of 4-methyl-2-pentnol at 15%, significantly improving the high-temperature stability of the product and meeting the requirements of high-end automotive braking systems.
2. Other special fluids
Hydraulic oil: in the anti-wear hydraulic oil, it can be used as an antifoam agent to reduce the foam generated during the operation of the hydraulic system and prevent cavitation. Experiments have shown that the addition of 0.05% 4-methyl-2-pentnol improves the anti foaming performance of hydraulic oil (GB/T 12579-2002) by 50%, and the system runs more smoothly.
Coolant: As an additive to antifreeze, it can lower the freezing point of the coolant (up to -50 ℃) and increase its boiling point (up to 130 ℃), making it suitable for extreme temperature environments. A certain coolant company increased its export volume by 30% by adding 8% 4-methyl-2-pentnol to meet international standards for product performance.
Synthesis of 4-methyl-2-pentanol:
First, acetone is converted into diacetone alcohol by compression in the presence of alkaline catalyst. The catalyst used is calcium hydroxide or barium hydroxide. When the catalyst particles are small and the surface area is large, the liquid-phase contact reaction is close to the homogeneous reaction. The reaction process releases heat, and the equilibrium conversion rate is high at low temperature. Therefore, the raw acetone should be precooled and the reaction should be operated at 0-10 ℃. Then, diacetone alcohol is dehydrated to produce isopropylidene acetone. The content of two kinds of ketone alcohol obtained in the process is generally 10-15%, which is concentrated to 80% by atmospheric distillation, and the unconverted acetone is separated and recovered at the same time. In the presence of acid catalysts such as nitric acid, boric acid or benzenesulfonic acid, heated to 100-200 ℃, diacetone alcohol is dehydrated to produce isopropylidene acetone with a conversion of 80-85%. However, diacetone alcohol can be decomposed into acetone by heating, so acetone in the base needs to be recovered from dehydration products. The last step is the hydrogenation of two isopropylidene ketones to produce.
In fact, if nickel or copper is used as catalyst and the conditions for gas phase hydrogenation are relatively mild under normal pressure, more methyl isobutyl ketone will be obtained. When the temperature is controlled at 170-210 ℃ and the molar ratio of hydrogen and isopropylidene acetone is increased, more methyl isobutyl methanol, the complete hydrogenation product, will be obtained. In general, the mixture of the two is obtained, and the vacuum distillation system is used for distillation separation. It can also be made from methyl-isobutyl (methyl) ketone by nickel catalytic hydrogenation, and then fractionated by distillation tower to obtain the finished product.
Frequently Asked Questions
What is another name for 4-methyl-2-pentanol?
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methyl isobutyl carbinol
4-Methyl-2-pentanol (IUPAC name: 4-methylpentan-2-ol) or methyl isobutyl carbinol (MIBC) is an organic chemical compound used primarily as a frother in mineral flotation and in the production of lubricant oil additives such as zinc dithiophosphate.
What is 4-methyl-2-pentanol used for?
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4-Methyl-2-pentanol is a fragrance ingredient used in cosmetics, fine fragrances, shampoos, toilet soaps and other toiletries as well as in non-cosmetic products such as household cleaners and detergents.
What is methyl isobutyl carbinol used for?
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Methyl isobutyl carbinol (MIBC) is a liquid derivative of acetone. It has limited solubility in water but is miscible with most organic solvents. Methyl isobutyl carbinol (MIBC) is used as a frother in the flotation process in the mining of ores, such as copper and molybdenum sulfide, as well as coal.
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