0,06 % of n-propyl bromide

0,06 % of n-propyl bromide

Purification processes provide a propyl bromide product containing at least 99.7 GC area % n-propyl bromide.

Compositions of 1,1,1,2,3,4,4,5,5,5-decafluoropentane and n-propyl bromide, or 1,1,1,2,3,4,4,5,5,5-decafluoropentane, n-propyl bromide an alcohol such as methanol, ethanol, and isopropanol, are described.

The process is especially suited for production of n-propyl bromide.

Also provided is a novel composition of enhanced thermal stability which comprises a mixture of n-propyl bromide and isopropyl bromide.

The solvent system comprises n-propyl bromide and an alkyl bromide in which the alkyl group contains 4 to 7 carbon atoms.

The mixture has an n-propyl bromide content of at least 99.7 GC area %, and an isopropyl bromide content of no more than 0.05 GC area %.

(b) as a stabilizer in the production of n-propyl bromide that is used in an industrial setting;

ECHA has announced that n-propyl bromide will be sunset in the EU by 2020

In a preferred embodiment the solvent system is comprised of effective amounts of npropyl bromide and 1, 1, 1, 3,3 -pentafluorobutane.

Certain substituted phenolic compounds when used with or without 1,2-epoxides as the sole stabilizer components are very effective in stabilizing n-propyl bromide (NPB).

This invention also relates to cleaning solvent systems comprised of n-propyl bromide and 1,1,1,3,3-pentafluorobutane and methods for cleaning various solid substrates.

The solvent system comprises n-propyl bromide and a mix of an alkyl bromide in which the alkyl group contains 4 to 7 carbon atoms and an alkane containing 6 to 7 carbon atoms.

A solvent-based surface coating composition of the invention comprises an n-propyl bromide-containing solvent with a polymeric coating resin dispersed therein.