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Freeze-pump-thaw and purging

MISCELLANEOUS TECHNIQUES Freeze-pump-thaw and purging [Pg.29]

B. Saturated Hydrocarbons. Purging and freeze-pump-thaw methods are effective in degassing paraffins. Distillation with the elimination of the first fractions produces dry solvent. Molecular sieves may also be used to remove water. Distillation from sodium-benzophenone ketyl is highly effective in obtaining very low levels of water and oxygen. Commercial grades of hydrocarbons are often contaminated with olefins, which can be eliminated by several washings... [Pg.51]

If nitrogen is being used as a purge gas, a moderate amount becomes trapped in the lattice of the frozen PF3 at — 196°C and its removal necessitates a series of subsequent freeze-pump-thaw cydes. After completion of the PCI3 addition, a gas purge of 20 min is used to sweep the PF3... [Pg.312]

See other pages where Freeze-pump-thaw and purging is mentioned: [Pg.16]    [Pg.17]    [Pg.31]    [Pg.37]    [Pg.16]    [Pg.17]    [Pg.31]    [Pg.37]    [Pg.29]    [Pg.26]    [Pg.14]    [Pg.170]    [Pg.16]    [Pg.17]    [Pg.48]    [Pg.24]    [Pg.71]    [Pg.28]    [Pg.116]    [Pg.31]    [Pg.83]    [Pg.212]    [Pg.284]    [Pg.21]    [Pg.37]    [Pg.37]    [Pg.313]    [Pg.434]    [Pg.6978]    [Pg.152]    [Pg.201]    [Pg.31]    [Pg.477]    [Pg.14]    [Pg.170]    [Pg.313]    [Pg.4]    [Pg.38]    [Pg.79]    [Pg.219]   
See also in sourсe #XX -- [ Pg.29 ]

See also in sourсe #XX -- [ Pg.31 ]

See also in sourсe #XX -- [ Pg.37 ]

See also in sourсe #XX -- [ Pg.37 ]



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And thawing

Freeze and thaw

Freeze-pump-thaw

Freeze-thawing

Freezing and

Freezing and thawing

Pump and purge

Pumps and Pumping

Purgatives

Purge

Purge pumps

Thawing

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