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- Occurrence
- History
- Applications
- Production
- Green Methanol
- Quality Specifications and Analysis
- Safety
- See Also
- External Links
Small amounts of methanol are present in normal, healthy human individuals. One study found a mean of 4.5 ppm in the exhaled breath of test subjects. The mean endogenous methanol in humans of 0.45 g/d may be metabolized from pectinfound in fruit; one kilogram of apple produces up to 1.4 g of pectin (0.6 g of methanol.) Methanol is produced by anaer...
In their embalming process, the ancient Egyptians used a mixture of substances, including methanol, which they obtained from the pyrolysis of wood. Pure methanol, however, was first isolated in 1661 by Robert Boyle, when he produced it via the distillation of buxus (boxwood). It later became known as "pyroxylic spirit". In 1834, the French chemists...
Production of formaldehyde, acetic acid, methyl tert-butyl ether
Methanol is primarily converted to formaldehyde, which is widely used in many areas, especially polymers. The conversion entails oxidation: 1. 2 CH3OH + O2 → 2 CH2O + 2 H2O Acetic acidcan be produced from methanol. Methanol and isobutene are combined to give methyl tert-butyl ether(MTBE). MTBE is a major octane booster in gasoline.
Methanol to hydrocarbons, olefins, gasoline
Condensation of methanol to produce hydrocarbons and even aromatic systems is the basis of several technologies related to gas to liquids. These include methanol-to-hydrocarbons (MtH), methanol to gasoline (MtG), methanol to olefins (MtO), and methanol to propylene (MtP). These conversions are catalyzed by zeolites as heterogeneous catalysts. The MtG process was once commercialized at Motunuiin New Zealand.
Gasoline additive
The European Fuel Quality Directive allows fuel producers to blend up to 3% methanol, with an equal amount of cosolvent, with gasoline sold in Europe. China uses more than 4.5 billion liters of methanol per year as a transportation fuel in low level blends for conventional vehicles, and high level blends in vehicles designed for methanol fuels.[citation needed]
From synthesis gas
Carbon monoxide and hydrogen react over a catalyst to produce methanol. Today, the most widely used catalyst is a mixture of copper and zinc oxides, supported on alumina, as first used by ICIin 1966. At 5–10 MPa (50–100 atm) and 250 °C (482 °F), the reaction 1. CO + 2 H2 → CH3OH is characterized by high selectivity (>99.8%). The production of synthesis gas from methane produces three moles of hydrogen for every mole of carbon monoxide, whereas the synthesis consumes only two moles of hydrogen...
Biosynthesis
The catalytic conversion of methane to methanol is effected by enzymes including methane monooxygenases. These enzymes are mixed-function oxygenases, i.e. oxygenation is coupled with production of water and NAD+: 1. CH4 + O2 + NADPH + H+ → CH3OH + H2O + NAD+ Both Fe- and Cu-dependent enzymes have been characterized. Intense but largely fruitless efforts have been undertaken to emulate this reactivity. Methanol is more easily oxidized than is the feedstock methane, so the reactions tend not to...
As of 2023, 0.2% of global methanol production is produced in ways that have relatively low greenhouse gas emissions; this is known as "green" methanol. Most green methanol is produced from gasification of biomass. Syngas is produced from biomass gasificationand further converted into green methanol. Another method of producing green methanol invol...
Methanol is available commercially in various purity grades. Commercial methanol is generally classified according to ASTM purity grades A and AA. Both grade A and grade AA purity are 99.85% methanol by weight. Grade "AA" methanol contains trace amounts of ethanol as well. Methanol for chemical use normally corresponds to Grade AA. In addition to w...
Methanol is highly flammable. Its vapours are slightly heavier than air and can travel to a distant ignition source and ignite. Methanol fires should be extinguished with dry chemical, carbon dioxide, water spray or alcohol-resistant foam.Methanol flames are invisible in daylight.
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They represent the relationship between pressure (on the vertical axis) and volume (on the horizontal axis) for an ideal gas at different temperatures: lines that are farther away from the origin (that is, lines that are nearer to the top right-hand corner of the diagram) correspond to higher temperatures. The ideal gas law, also called the ...
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