Analysis of Methanol in Water Sample by Gas Chromatography
Keywords:
MTBE, Calibration, Drain, FID etc.Abstract
Methanol typically contaminates the polymer-grade propylene product. The sources of methanol are direct injection into the cold box and cold fractionation areas to remove hydrates and feed stocks containing either methanol or MTBE. A small amount of methanol is produced during the cracking of an impurity-free feedstock in Naphtha cracker and is generally insufficient to cause propylene product purity problems. About 50 to 60% of methanol passes through the furnace unreacted with the balance methanol forming carbon monoxide and hydrogen.
CH3OH ? CO + 2H2
Methanol from the furnace enters the process water steam in the quench tower or charge gas condensate of Naphtha cracking units. The majority of methanol in the process water is vaporized in the dilution steam system and recycled to the furnace. Methanol accumulation can be monitored in the process water as early detection of potential propylene-methanol product purity problems.
Methanol in propylene gas is analyzed by test method MTM 151014E. In this test method, a gas sample is injected into the Gas Chromatography by a gas sampling valve and passes through a capillary column to separate the components and FID is used for detection. The concentration of components is calculated by the external standard method. NO test method is available for analysis of methanol contents in water samples.
In the present work, a new method has been developed for the analysis of methanol in water samples by Gas Chromatography.
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