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Glycol dehydration unit solutions

Two additional steps were taken to minimize corrosion downstream of the glycol dehydrator unit. One was the use of a product-gas scrubber to minimize glycol entrainment in the gas stream, and the other was the use of a second inhibitor that was added to the dried-gas stream. This material was of the polyethanolrosinamine-type consisting of 70% solution in isopropyl alcohol of a mixture of 90% ethoxylated rosinamine (II moles ethylene oxide with each mole of rosinamine) and 10% free rosinamine. This inhibitor was injected at the rate of 0.1 gal/day for a gas volume of 60 MMsef/day. As a result of the above measures, the corrosion rate of coupons suspended in the dried-gas line decreased from almost 30 mils ear to as low as 0.2 mil/year during about 4 years of testing. [Pg.991]

The pressure of the rich glycol stream is dropped to near atmospheric and is sent to the regenerator system. Heat is added to the bottom of the column, and the water is driven out of solution to produce the lean glycol stream, which is returned to the contactor. The water exits as the offgas from the top of the regenerator still. In the case of an acid gas dehydration unit, this offgas steam contains H2S and C02 for reasons that will be discussed later, and cannot be vented to the atmosphere. In an acid gas dehydration... [Pg.184]

Glycol loss constitutes one of the most important operating problems of dehydration units. Most of this loss occurs as carry-over of solution with the product gas, although a small amount of glycol is lost hy vaporization into the gas stream. An additional small amount is... [Pg.988]

The aqueous solution rich in ethylene oxide is sent to purification. It passes through a stripping column, which operates under vacuum and separates the ethylene oxide at the top. The aqueous effluent leaving at the bottom is recycled to the absorption stage. It can be treated in an auxiliary unit to recover the glycol it contains. The top effluent which, in addition to carbon dioxide, contains acetaldehyde and hydrocarbon traces, is sent to two distillation columns in series, one for dehydration ( = 20 trays), and the second for purification (S 50 trays). These columns produce high-purity ethylene oxide with a very low acetaldehyde content. The product is stored in liquid form in tanks under nitrogen pressure. [Pg.5]

The degree of dehydration that can be attained with a glycol solution is primarily dependent on the extent to which water is removed from the solution in the reconcentrator. The operation of atmospheric pressure distillation units for water removal is limited by the maximum temperature that can be tolerated without excessive decomposition of the glycol (about 400°F for TEG). Concentration of TEG to 98.5 to 99.0% is attainable in a simple atmospheric pressure still. When significantly higher concentrations are needed to meet stringent gas dehydration requirements, the use of an enhanced stripping technique is necessary. [Pg.957]


See other pages where Glycol dehydration unit solutions is mentioned: [Pg.52]    [Pg.101]    [Pg.175]    [Pg.980]    [Pg.983]    [Pg.997]    [Pg.1008]    [Pg.1011]    [Pg.22]    [Pg.198]    [Pg.9]    [Pg.499]    [Pg.21]    [Pg.962]   
See also in sourсe #XX -- [ Pg.387 , Pg.388 ]




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