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Flash vacuum pyrolysis (FVP) is a technique in organic synthesis. It entails heating a precursor molecule intensely and briefly. It entails heating a precursor molecule intensely and briefly. Two key parameters are the temperature and duration (or residence time), which are adjusted to optimize yield, conversion, and avoidance of intractable ...
Thermal rearrangements of aromatic hydrocarbons are generally carried out through flash vacuum pyrolysis (FVP). [14] In a typical FVP apparatus, a sample is sublimed under high vacuum (0.1-1.0 mmHg ), heated in the range of 500-1100 °C by an electric furnace as it passes through a horizontal quartz tube, and collected in a cold trap.
If isolation or reaction of an elusive diene or dienophile is the goal, one of two strategies may be used. Flash vacuum pyrolysis of Diels–Alder adducts synthesized by independent means can provide extremely reactive, short-lived dienophiles (which can then be captured by a unique diene). [11]
Flash vacuum pyrolysis techniques generally have lower chemical yields than solution-chemistry syntheses, but offer routes to more derivatives. Corannulene was first isolated in 1966 by multistep organic synthesis. [4] In 1971, the synthesis and properties of corannulane were reported. [5] A flash vacuum pyrolysis method followed in 1991. [6]
The synthesis is as shown below. FVP stands for flash vacuum pyrolysis. Some bowl-shaped molecules reported in the literature are in fact partially hydrogenated. A C 56 H 40 hydrocarbon has been synthesized containing 54 of the 60 carbon atoms found in fullerene [7]
Pyrolysis is the thermal decomposition of materials in an inert atmosphere or a vacuum. The sample is put into direct contact with a platinum wire, or placed in a quartz sample tube, and rapidly heated to 600–1000 °C. Depending on the application even higher temperatures are used.
A specific method of pyrolysis of biomass, termed "fast pyrolysis," converts particles of biomass to about 10% carbon-rich solid called char, about 15% gases such as carbon dioxide, and about 70% a mixture of organic compounds commonly referred to as "bio-oil" at 500 °C in 1–2 seconds. [1]
Flash vacuum pyrolysis often utilize a fused quartz tube, usually packed with quartz or ceramic beads, which is heated at high temperatures. References This ...
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