high-pressure process

high-pressure process

[′hī ¦presh·ər ′prä·səs]
(chemical engineering)
A chemical process operating at elevated pressure; for example, phenol manufacture at 330 atmospheres (1 atmosphere = 101,325 pascals), ethylene polymerization at 2000 atm, ammonia synthesis at 100-1000 atm, and synthetic-diamond manufacture up to 100,000 atm.
References in periodicals archive ?
A special high-pressure process (cold pressed) is used to seal in the flavour without heat or the addition of preservatives.
These reactors expand the use of EasyMax to both organic chemists who seek an autoclave-like experience and chemical engineers who desire high-pressure process characterization.
In the past, high-pressure centrifugal compressors suffered from rotordynamic instability because high-pressure process gas produces considerable excitation and reaction forces on the rotor.
Typically, high-pressure process fluids are regulated before entering the point of use.
In these cases, gate velocity can be the same as the conventional high-pressure process. However, fast shot speed causes air problems in relationship to the amount of fill required.
Since its commercialization by GE in 1958, this rugged and expensive high-pressure process for synthesizing diamond has become the basis of a half-billion-dollar per year abrasive-grit industry whose end-products include diamond-coated cutting tools for drilling, mining, quarrying, precisely machining automotive parts and producing dies used by wire makers.
Castings produced using the UBE high-pressure process were shown by Shu Suzuki, UBE Industries, Ltd.
Consumer demand for additive-free foods with fresh-like textures and taste lead to the development of this high-pressure process, a cold pasteurization sterilization technique that subjects pre-packaged, water-tight food products to high levels of hydrostatic pressure for a few seconds to a few minutes.
To predict temperature, the models would require equations that describe all heat transfer phenomena that could occur during the compression, pressure-holding and decompression phases of the high-pressure process. While this type of model may be complicated to construct, it could give a complete and accurate vision of all the parameters involved and their relationships to each other.

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