Method for raising diesel yield through gasoline-diesel fractionating towers

A fractionation tower, gasoline and diesel technology, applied in the direction of gasoline stabilization, etc., can solve problems such as water accumulation on the top, and achieve the effect of increasing diesel production, considerable benefits, and reducing load
CN101580731AActive Publication Date: 2009-11-18PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2009-11-18

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Abstract

The invention relates to a method for raising diesel yield through gasoline-diesel fractionating towers. The method comprises the steps of controlling the temperature of the top of a fractionating tower, cooling top circulation oil, sending the cooled top circulation oil into dehydration facilities, removing free water contained by the top circulation oil through gravity sedimentation and returning the dehydrated top circulation oil to a tray on the upper part of the fractionating tower. The fractionating tower adopts a dehydration process on a top circulation part, effectively reduces the temperature of the top of the fractionating tower by about 10 DEG C, and can raise the diesel yield by 5 to 8 percent. The diesel yield rises from 33 percent to 40 percent; the ratio of diesel to gasoline is up to over 1.15; and the top of the catalytic cracking fractionating tower has an extremely low temperature, which takes a lead in China. The method has the advantages of widening diesel distillation range and achieving the objective of greatly increasing the diesel yield. The use of a fractionating-tower top-circulation dehydration process also produces energy-saving benefit, such as the utilization of low-temperature waste-heat recovery, the load reduction of aerostatic presses, and the like.
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Description

technical field

[0001] The invention relates to a gasoline and diesel fractionation tower which utilizes the circulating dehydration at the top of the gasoline and diesel fractionation tower to solve the problem of unstable operation of the fractionation tower due to lowering the temperature at the top of the fractionation tower when widening the distillation range of diesel oil is used to increase the yield of diesel oil. rate method. technical background

[0002] Affected by the domestic objective situation, the demand for diesel oil in the market is much greater than that of gasoline. From the perspective of the market supply of finished diesel oil, about 40% of the diesel oil comes from the catalytic cracking process. Therefore, as far as the production of catalytic cracking units is concerned, under the premise of ensuring safety, product quality and environmental protection, increasing diesel production is a direction to pursue the maximization of economic benefits for...

Claims

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