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- Ether is a
class of organic compounds which contain an ether group — an
oxygen atom connected to two (substituted) alkyl or aryl groups
— of general formula R–O–R'.
- Ethers can
act as Lewis bases.
- Ethers in
general are of very low chemical reactivity.
DME synthesis catalyst precursors were prepared by
first aryl trifluoromethylethers were prepared by
displacement of chlorine by fluorine was realized with
anhydrous hydrogen fluoride or with antimony trifluoride in
the presence of antimony pentachloride.
very versatile methodology functionalizing trifluoromethoxy
substituted aromatics is based on the synthesis-oriented
metal is introduced into a substrate in general by either
one of two favorite methods, the permutational
interconversion of halogen against metal or hydrogen against
metal and subsequently replaced by an electrophile.
Existing technology produces DME through the dehydration of
methanol. The scale of the plant in actual operation,
however, is rather small, and scaling-up is an issue to
produce DME as a commercial fuel.
addition, the equilibrium conversion of the methanol
synthesis reaction is relatively small. On the other hand,
because the methanol synthesis equilibrium limitation can be
avoided in the direct DME synthesis reaction, a higher
conversion rate can be achieved.
dry technology uses a solvent similar to the solvent used in
the hydrocarbon process but it contains two additional
materials in small quantities.
- One of
these materials is a hydrofluoroether (HFE) which is
apparently added to accelerate drying and the other is a
perfluorocarbon (PFC) which is apparently added to suppress
the flash point of the hydrocarbon.
ether technology is based on use of a mixture of substituted
aliphatic glycol ethers.
Europe that is likely to be high growth categories, such as
men's grooming and sun care, where increasing functional and
complex formulations are being launched on the market at a
fast growing rate.
was once a developing hub for the manufacturer of cellulose
esther, that is now starting to change, as the market is
being challenged by cheaper, good quality alternatives from
total European market for glycol ethers and their acetates
is about 300 000 tonne year, of which 110 000-120 000 tonne/year
is taken by P series (PO-based) and the rest by E series (EO-based)
consumption of MTBE into gasoline will decrease by nearly
8%/year while demand into other applications increases by
nearly 5%/year. However, the non-gasoline sector will remain
a small percentage of the market.
- In the
nuclear waste application, the objective was to develop
lipophilic crown ethers that could be used in solvent
extraction processes for the removal of sodium and potassium
hydroxide and nitrate, which could then be potentially
recycled for use in other processes.
are various reasons for selecting pentaBDE as a pilot
substance for testing the set criteria and information
- It is
an intentionally produced flame retardant used in many type
of articles. Due to its wide use and releases to the
environment, elevated levels of pentaBDE have been found in
environmental and human tissue samples.
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