Method for preparing gasoline from liquefied gas through aromatization and fixed bed reactor

Abstract

The invention relates to a method for preparing gasoline from liquefied gas through aromatization. A technical process of the invention consists of three parts: raw material pretreatment, circular reaction and regeneration, and absorption and stabilization. The method comprises the following steps: firstly, washing liquefied gas raw materials by water for removing impurities; making the water washed liquefied gas enter a fixed bed reactor for carrying out reaction under the condition of 280 to 410 DEG C; and carrying out product separation on products after reaction through an absorption and stabilization system. Compared with the prior art, the invention can realize the continuous production without adding an external cooling device, the investment is saved, the operation link is reduced, and the production efficiency is obviously improved.

Description

Technical field: [0001] The invention belongs to the field of organic chemical synthesis, in particular to a method for preparing gasoline by aromatization of liquefied gas and a fixed bed reactor. Background technique: [0002] Liquefied gas (LPG) is one of the petroleum products. It is a colorless and volatile gas obtained by pressurizing, cooling and liquefying refinery gas. The main components are propane, propylene, butane, butene, and a small amount of pentene Alkane, pentene and trace sulfur compounds impurities. [0003] At present, my country's liquefied petroleum gas is mainly burned as a civil fuel, the chemical utilization rate is insufficient, and the economic benefits are low; as the civilian fuel market of liquefied petroleum gas has been gradually replaced by relatively cheap pipeline natural gas in recent years, the market prospect of liquefied petroleum gas Not optimistic, economic benefits will further decline. On the other hand, at present, 80% of the bl...

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Problems solved by technology

However, under low temperature conditions, when liquefied gas produces light aromatic gasoline components, oligomerization, cyclization and aromatization reactions are the dominant reactions, which is a strong exothermic reaction, and the temperature rise of the bed is relatively high; with the increase of reaction temperature increase, the side reaction speed is accelerated, dry gas, coke and other by-products increase, and the single-pass life of the catalyst is shortened; in order to reduce the temperature rise of the bed, and on the premise of ensuring production capacity, multiple fixed-bed reactors are often used in series / Parallel mode, adding heat exchangers between the reactors to take away heat to ensure a suitable reaction temperature; although this method can effectively control the reaction temperature, it increases equipment investment and maintenance costs, and is not conducive to production operations

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