Issues regarding the installation of the decarboxylation five-column tower and the isobutane removal tower in the gas phase section
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Some plants are equipped with carbon removal towers in their gas separation units, some have isobutane removal towers, while others do not have any such towers at all. 1. In what situations is it necessary to set this up in this way? 2. What are the requirements for the separation accuracy at the top and bottom of the five decarburization towers? 3. What are the requirements for the separation accuracy at the top and bottom of the decarburized isobutane column?
1. When the carbon pentane content in the raw gas used in the gas phase exceeds 2–3%, a carbon pentane removal tower must be installed to meet the requirements regarding carbon pentane levels in liquefied gas for domestic use or for vehicles. . . 2. Regarding the composition requirements at the top and bottom of the five-decarbonation towers, it is sufficient that the proportion of combined C4 in total carbon pentane does not exceed 5%; the carbon pentane components are then transferred to the stabilization unit where they are combined to form stabilized gasoline product. . . 3. The design of the isobutane removal column generally depends on the requirements of the desired product. When producing vehicle-grade gas, the total alkene content in its composition must be determined based on the requirement that the total alkene level in this gas should not exceed 10%. Thus, through simulation calculations, the olefin content in the mixed C4 at the bottom of the tower can be controlled at 5% – with all olefins considered together and representing a total of 5% – which can then be used as a design value. :lol
The market for producing civilian gas is no longer large; producing gas for vehicles is a good option. . . Especially liquefied gases with low olefin content, such as coking gas, which have little value for chemical use. . . :lol
What is the typical pressure for carbon four decarboxylation at stage five?