Process and device for processing and preparing hydrocarbon by utilizing liquefied gas

Abstract

The invention discloses a process and a device for processing and preparing hydrocarbon by utilizing liquefied gas. The process comprises the processes of cracking reaction, absorption and stabilization, aromatization reaction, gas separation raw material gas stripping concentration and aromatic hydrocarbon purification. The device comprises a cracking reaction system, an absorption and stabilization system, an aromatization reaction system, a gas separation raw material gas stripping concentration system and an aromatic hydrocarbon purification system. The process and the device have the advantages that the energy consumption is low, and after the process is adopted, a deisobutanizer stops running, 90 kilograms of standard coals consumed by a carton-4 raw material per ton are treated, and 48.5 percent of energy is saved; gas separation raw material gas propylene is high in content and is improved from 15 percent to 50 percent in mass fraction; the requirements on equipment and heat energy are low and are easily realized; and the device is simple in process, is easy in operation and control and stable in running.

Description

technical field [0001] The invention relates to a liquefied gas deep processing technology, in particular to a technology and a device for processing hydrocarbons by utilizing liquefied gas, and belongs to the field of processing hydrocarbons by liquefied gas. Background technique [0002] There are many methods for the processing and separation of liquefied gas used in chemical production. At present, there is mainly one kind commonly used in the industry: first pretreatment of raw materials, the C2C3 components in the liquefied petroleum gas are extracted from the top of the depropanizer, and the mixed C4 components at the bottom of the tower enter the deisobutanizer , the isobutane is separated from the top of the deisobutanization tower, and the components with carbon four or more at the bottom of the tower enter the cracking reaction system for cracking reaction, and the obtained low-carbon hydrocarbons including propylene enter the absorption stabilization system; Abs...

AI Technical Summary

Problems solved by technology

[0003] This method has high requirements on equipment and heat energy, especially when separating isobutane in the de-isobutanizer tower, 200 layers of trays are needed, the height of the whole tower reaches 160 meters, and the temperature at the top of the tower is not lower than 50°C. The thermal conditions are harsh, the energy consumption is high, accounting for 50% of the total energy consumption, the operation of the device is uncoordinated, and the quality of the isobutane product cannot meet the requirements; at the same time, the content of propylene in the raw gas produced is low, only 15%, resulting in the downstream gas Unstable operation of sub-device

At the same time, the aromatic hydrocarbon impurity content after the aromatization reaction is high, the market competitiveness of the product is weak, and the price is low

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