Propylene Glycol Monomethyl Ether-Water System

1 Propylene Glycol Monomethyl Ether-Water System 

The purpose of the preconcentrator column is to remove part of the water in the fresh feed (assume the fresh feed composition is 90 mol% water). The distillate composition of this 

Design and Control of Distillation Systems for Separating Azeotropes. By William L. Luyben and I-Lung Chien Copyright 2010 John Wiley Sons, Inc. 

Another point worth mentioning is that the products of the column sequence (PM and water) are in different distillation regions (see Fig. 8.4). This normally cannot happen for a column sequence with relatively hnear distillation boundaries, as is the case for this system. The reason that the distillation boundary can be crossed in this system is the liquid-liquid separation occurring in the decanter. 

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To evaluate new filter and/or purifier technology placed in distribution or recirculation lines, ICP-MS has been applied to analyze impurities in ethyl lactate, ethyl 3-ethoxy propionate, propylene glycol monomethyl ether acetate and 2-heptanone, water and IPA, or diluted HF. ICP-MS is also the recommended technique to evaluate the purity of polymer eomponents used in UPW and liquid chemical distrihution systems. It has also heen applied to evaluate the relative effectiveness of various acids for extracting impurities from components made of different types of fluorinated polymers. ... 

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