Measures for increasing isobutane production in liquid petroleum gas comprehensive utilization unit
The liquefied petroleum gas comprehensive utilization unit of Sinopec Jinling Branch uses refinery liquid petroleum gas as raw material to produce high-purity isobutene,besides,it also produces olefins and n-butane as by-products,fully utilizing the liquid petroleum gas.Due to the influence of raw materials,a new n-butane isomerization unit was added to the device.After the renovation,the isobutane production reached 53 t/h,but it still cannot meet the demand.We focus on analyzing the influencing factors of isobutane production and find that the operating condition of the product tower seriously restrict the increase of isobutane produc-tion.Corresponding solutions were proposed from optimizing the raw material ratio,reducing isobutane loss,and improving the yield of n-butane isomerization to increase isobutane production by 5.5 t/h.Meanwhile,it was recommended to add a distillation tower after the isomerization unit stabilizing tower,which could in-crease isobutane production to 65 t/h and met the market demand.
liquid petroleum gas utilizationisobutaneisomerization unitextractive distillation
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