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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

Active Publication Date: 2009-11-18
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to increase the yield of diesel oil in the gasoline and diesel fractionation tower, add a dehydration system in the top circulation of the gasoline and diesel fractionation tower, and solve the problem of water accumulation at the top of the fractionation tower when reducing the temperature at the top of the fractionation tower. The generation of large load and other phenomena can realize the normal and stable operation of the fractionation tower

Method used

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  • Method for raising diesel yield through gasoline-diesel fractionating towers
  • Method for raising diesel yield through gasoline-diesel fractionating towers
  • Method for raising diesel yield through gasoline-diesel fractionating towers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Table 1 Analysis of operating parameters before and after implementation

[0015]

[0016] Table 2 Comparative analysis of diesel quality before and after implementation

[0017]

[0018] Under the condition that the reaction temperature and the amount of slag added are approximately constant, the top temperature and middle temperature of the fractionation tower will change significantly after the implementation of the technology, and the heat load will decrease as a whole. The diesel yield increased from 33.4% to 40.55%, the gasoline yield decreased from 43.17% to 36.74, and the diesel-gasoline ratio increased from 0.774 to 1.103.

Embodiment 2

[0020] Table 3 Analysis of operating parameters before and after implementation

[0021]

[0022] Table 4 Comparative analysis of diesel quality before and after implementation

[0023]

[0024] Under the condition that the reaction temperature and the amount of slag added are approximately constant, the top temperature and middle temperature of the fractionation tower will change significantly after the technology is implemented, and the overall heat load will decrease. The diesel yield increased from 33.27% to 40.55%, the gasoline yield decreased from 40.95% to 37.61, and the diesel-gasoline ratio increased from 0.812 to 1.078.

Embodiment 3

[0026] Table 5 Analysis of operating parameters before and after implementation

[0027]

[0028]

[0029] Table 6 Comparative analysis of diesel quality before and after implementation

[0030] Under the condition that the reaction temperature and the amount of slag added are approximately constant, the top temperature and middle temperature of the fractionation tower will change significantly after the technology is implemented, and the overall heat load will decrease. The diesel yield increased from 36.76% to 40.7%, the gasoline yield decreased from 41.26% to 35.23, and the diesel-gasoline ratio increased from 0.89 to 1.144.

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G7/02
Inventor 刘建新齐宏伟甄新平张华东常新炜
Owner PETROCHINA CO LTD
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