A process directed to acetic acid production comprising providing a feed stream comprising methyl iodide, water, acetic acid, methyl acetate, and at least one PRC to a distillation column comprising a distillation zone and a bottom sump zone and distilling the feed stream at a pressure and a temperature sufficient to produce an overhead stream comprising methyl iodide and at least one PRC, and a residuum stream flowing from the bottom sump zone comprising water and greater than or equal to about 0.11 weight percent HI is disclosed herein.

Described herein are systems and methods of fouling mitigation in a hydrocarbon fractionation column. The methods correlate operating parameters of the fractionation column, specifically flow rate and temperature, with fouling. The methods can include measuring a temperature and a flow rate at a bottom stream of the hydrocarbon fractionation column; providing the measured temperature and flow rate to a processing device; determining, by the processing device, based on the measured temperature and flow rate of the bottom stream, an antifoulant treatment protocol for the hydrocarbon fractionation column; and treating the hydrocarbon fractionation column by controlling, by the processing device, a feed control unit in accordance with the determined antifoulant treatment protocol.

A system and method for purging a bottom slurry circuit isolation valve using hydrocarbons.

Systems and methods for producing a colorless triethanolamine product stream with a degree of purity of greater than or equal to 99% by weight from the triethanolamine distillation columns in a non-reactive distillation process. The desired triethanolamine product stream can be obtained by increasing the bottom stream flow rate at the diethanolamine column by 80 kilograms per hour, and reducing the triethanolamine product stream flow rate by 500 kilograms per hour. This process can result in a reduction of the temperature at the triethanolamine column by up to 23.5 degrees. The reduced temperature can result in a triethanolamine product stream with an APHA color of 0 to less than 50, for example, 0 to 40, for example, 0 to 30, for example 0 to 20, and for example, 0 to 10.

A CO.sub.2 recovery device includes: a CO.sub.2 absorption tower in which CO.sub.2 included in an exhaust gas is absorbed by a CO.sub.2 absorption liquid; and a CO.sub.2 absorption liquid regeneration tower that heats and regenerates the CO.sub.2 absorption liquid that has absorbed CO.sub.2. The CO.sub.2 absorption liquid regeneration tower includes: a main body part in which the CO.sub.2 absorption liquid is temporarily stored; a boot part provided downward from a mirror surface part of the main body part, having a relatively smaller capacity than the main body part; a flowmeter provided to the boot part, and measuring the liquid surface level of the CO.sub.2 absorption liquid that changes between the main body part and the boot part; and a control device controlling the liquid surface level of the CO.sub.2 absorption liquid between the main body part and the boot part on the basis of the measurement result of the flowmeter.