Abstract: Processes for producing acetic acid and determining corrosion therein are described herein. The processes generally include contacting methanol and carbon monoxide in the presence of a liquid reaction medium under carbonylation conditions sufficient to form acetic acid, wherein the liquid reaction medium includes: a carbonylation catalyst selected from rhodium catalysts, iridium catalysts and palladium catalysts; from 1 wt. % to 14 wt. % water; and one or more, in-situ generated derivatives of the one or more additives and combinations thereof; wherein the one or more additives are independently selected from non-benzoyl containing pentavalent phosphine oxides, compound mixtures of at least four phosphine oxides and pentavalent aryl or alkaryl phosphine oxides including one or more benzoyl groups; and recovering acetic acid from the process.

Abstract: The invention provides a process of polymerizing ethylene and at least one ?-olefin, said process comprises polymerizing the ethylene and the at least one ?-olefin in the presence of 5-ethylidene-2-norbornene, which comprises low levels of impurities, as determined by the absorbances at the following wavelengths: 320 nm and 343 nm. The invention also provides a method of increasing the catalysts efficiency, and a method of determining the expected catalyst efficiency, each in a polymerization of ethylene and at least one ?-olefin in the presence of the 5-ethylidene-2-norbornene, which comprises low levels of impurities, as determined by the absorbances at the above wavelengths. The invention further provides a method of purifying 5-ethylidene-2-norbornene to form a purified 5-ethylidene-2-norbornene, which comprises low levels of impurities, as determined by the absorbances of the above wavelengths.

Abstract: The invention provides a process of polymerizing ethylene and at least one ?-olefin, said process comprises polymerizing the ethylene and the at least one ?-olefin in the presence of 5-ethylidene-2-norbornene, which comprises low levels of impurities, as determined by the absorbances at the following wavelengths: 320 nm and 343 nm. The invention also provides a method of increasing the catalysts efficiency, and a method of determining the expected catalyst efficiency, each in a polymerization of ethylene and at least one ?-olefin in the presence of the 5-ethylidene-2-norbornene, which comprises low levels of impurities, as determined by the absorbances at the above wavelengths. The invention further provides a method of purifying 5-ethylidene-2-norbornene to form a purified 5-ethylidene-2-norbornene, which comprises low levels of impurities, as determined by the absorbances of the above wavelengths.

Abstract: A process for producing polymer particles in a gas phase polymerization reaction using a group 4 metal complex containing delocalized &pgr;-electrons and optionally a flow aid.