Process and composition for drying of gaseous hydrogen halides

Patent · Tue Aug 01 00:00:00 EDT 1989

OSTI ID:867058

Tom, Glenn M ^[1]; Brown, Duncan W ^[2]

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1. New Milford, CT
2. Wilton, CT

A process for drying a gaseous hydrogen halide of the formula HX, wherein X is selected from the group consisting of bromine, chlorine, fluorine, and iodine, to remove water impurity therefrom, comprising: contacting the water impurity-containing gaseous hydrogen halide with a scavenger including a support having associated therewith one or more members of the group consisting of: (a) an active scavenging moiety selected from one or more members of the group consisting of: (i) metal halide compounds dispersed in the support, of the formula MX.sub.y ; and (ii) metal halide pendant functional groups of the formula -MX.sub.y-1 covalently bonded to the support, wherein M is a y-valent metal, and y is an integer whose value is from 1 to 3; (b) corresponding partially or fully alkylated compounds and/or pendant functional groups, of the metal halide compounds and/or pendant functional groups of (a); wherein the alkylated compounds and/or pendant functional groups, when present, are reactive with the gaseous hydrogen halide to form the corresponding halide compounds and/or pendant functional groups of (a); and M being selected such that the heat of formation, .DELTA.H.sub.f of its hydrated halide, MX.sub.y.(H.sub.2 O).sub.n, is governed by the relationship: .DELTA.H.sub.f .gtoreq.n.times.10.1 kilocalories/mole of such hydrated halide compound wherein n is the number of water molecules bound to the metal halide in the metal halide hydrate. Also disclosed is an appertaining scavenger composition and a contacting apparatus wherein the scavenger is deployed in a bed for contacting with the water impurity-containing gaseous hydrogen halide.

• Research Organization: ADVANCED TECHNOLOGY MATERIALS
• DOE Contract Number: AC01-87ER80469
• Assignee: Advanced Technology Materials, Inc. (New Milford, CT)
• Patent Number(s): US 4853148
• Application Number: 07/029,631
• OSTI ID: 867058
• Country of Publication: United States
• Language: English

Related Subjects

process
composition
drying
gaseous
hydrogen
halides
halide
formula
hx
selected
consisting
bromine
chlorine
fluorine
iodine
remove
water
impurity
therefrom
comprising
contacting
impurity-containing
scavenger
including
support
associated
therewith
active
scavenging
moiety
metal
compounds
dispersed
mx
ii
pendant
functional
-mx
y-1
covalently
bonded
y-valent
integer
value
corresponding
partially
alkylated
reactive
form
heat
formation
delta
hydrated
governed
relationship
gtoreq
times
10
kilocalories
mole
compound
molecules
bound
hydrate
disclosed
appertaining
apparatus
deployed
bed
hydrogen halides
gaseous hydrogen
hydrogen halide
metal halide
containing gas
remove water
covalently bonded
associated therewith
scavenger composition
moiety selected
water molecules
formula mx
halide compound
move water
containing gaseous
/252/34/423/