Stabilization of liquid sulfur trioxide
AssigneeAllied Chemical Corporation
InventorsAnthony W. Yodis, Frank J. Kremers, Karol K. Lintern
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Abstract
Liquid sulfur trioxide is stabilized against polymerization by incorporating therein a stabilizer combination of a normally liquid siloxane polymer with a methyl ester of an acid of boron.
Claims12
A composition consisting of liquid sulfur trioxide and a stabilizer combination comprising (1) a normally liquid siloxane polymer substituted by a radical selected from the group consisting of methyl and methoxy in which all silicon valences unfilled by said radical are satisfied by hydrogen, in amount of at least about 0.01 percent by weight of the sulfur trioxide, and (2) a methyl ester of an acid of boron, in amount of at least about 0.01 percent by weight, the weight ratio of siloxane polymer to the methyl ester being from about 1:1 to about 10:1, said composition leaving a flowable liquid residue on vaporization of the sulfur trioxide.
The method of stabilizing liquid sulfur trioxide which comprises incorporating in said sulfur trioxide a stabilizer combination comprising (1) a normally liquid siloxane polymer substituted by a radical selected from the group consisting of methyl and methoxy in which all silicon valences unfilled by said radical are satisfied by hydrogen, in amount of at least about 0.01 percent by weight of the sulfur trioxide, and (2) a methyl ester of an acid of boron, in amount of at least about 0.01 percent by weight, the weight ratio of siloxane polymer to the methyl ester being from about 1:1 to about 10:1, to obtain a stabilized sulfur trioxide composition leaving a flowable liquid residue on vaporization of the sulfur trioxide.
Dependencies are inferred from the claim text.