Method for preparing gasoline by double absorption and desorption of dry gas

Abstract

The invention discloses a method for preparing gasoline by double absorption and desorption of dry gas. The method is characterized in that the raw material dry gas is subjected to first group absorption and desorption to remove part of olefin, and high-value ethylene and propylene are recovered while the olefin concentration in the dry gas feed is reduced; dry tail gas enters the second group for absorption and desorption, part of ethane, propane and butane is separated out and recycled back to the reactor, the olefin concentration in the fed dry gas is reduced, and meanwhile propane, butane and C5 are recycled. The double-absorption desorption reduces the olefin concentration in the fed dry gas from two aspects of separating the olefin in the raw material and recycling the alkane in the tail gas, effectively controls the temperature rise of the reactor, solves the problem that the reaction temperature is difficult to control in the process of preparing gasoline from the dry gas, and is suitable for dry gas raw materials with different sources and different olefin concentrations.

Description

technical field [0001] The invention relates to a method for preparing gasoline from dry gas. Specifically, it is a method of converting low-value-added dry gas into high-value-added clean gasoline. The gasoline produced by the reaction has a high octane number and low sulfur content, and is an ideal blend of high-octane clean gasoline. components. Background technique [0002] With the increasing shortage of global oil resources and high oil prices, it is the goal that oil refiners have been pursuing to make good use of limited resources to squeeze out every drop of oil. Catalytic cracking is the main operation unit of the refinery, and a large amount of dry gas is produced as a by-product, which contains a considerable amount of ethylene, which is usually used as fuel or directly burned by flaring, resulting in a huge waste of resources. [0003] At present, there are two main researches on the utilization of refinery dry gas: one is to extract ethylene from refinery dry...

AI Technical Summary

Problems solved by technology

Dry gas raw materials come from a wide range of sources, and the concentration of ethylene in them is unevenly distributed, and the reaction of light olefins in dry gas superposition to generate gasoline is a strong exothermic reaction, the reaction heat effect is large, and the reaction temperature is not easy to control

Therefore, the industrialization of dry gas to gasoline process is very difficult

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