Separation technology of hydrogen sulfide and carbon dioxide in acid gas of oil refinery

Abstract

The invention relates to a separation technology of hydrogen sulfide and carbon dioxide in acid gas of an oil refinery. According to the technical scheme, the separation technology comprises the following processing steps that the acid gas of the oil refinery flows through an acid gas separating tank and an acid water separating tank and then enters a first absorbing column; the acid gas at the bottom part of the first absorbing column is in contact with barren liquor from the upper part of the column, thus hydrogen sulfide in the acid gas can be fully absorbed to generate rich liquor; the rich liquor and barren liquor enter a first-grade rich-barren heat exchanger to exchange the heat and then enter a first regenerating column to regenerate; H2S gas generated at the top of a second regenerating column is condensed through a second condenser and then flows into a separating tank; a separated liquid phase is used for backflow in the top of the regenerating column; and a gas phase, namely, H2S gas, is used as sodium hydrosulfide to prepare some of raw materials. The separation technology has the beneficial effects that a methyldiethanolamine extracting agent at a concentration of 50% is selected; and compared with other extracting agents, the methyldiethanolamine extracting agent has relatively high selectivity and stability, causes a very little loss, and is low in energy consumption of devices.

Description

Technical field: [0001] The invention relates to a chemical production technology, in particular to the separation technology of hydrogen sulfide and carbon dioxide in the acid gas of an oil refinery. Background technique: [0002] The traditional sour gas treatment method in refineries is to use the Claus process technology to produce sulfur. Although this process can solve the problem of acid gas pollution, the process is complicated, the operation cost is high, the energy is high, and the price of sulfur fluctuates greatly. Therefore, the development of acid gas The new way of gas utilization is of great significance to solve environmental pollution, save energy, and increase the added value of enterprise products. [0003] In the by-product acid gas in the refinery production process, the content of hydrogen sulfide is about 85%, and the content of carbon dioxide is about 10%, and it also contains a small amount of hydrocarbon gas. Since both hydrogen sulfide and carbon...

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Problems solved by technology

[0005] The main problems: (1) Since both hydrogen sulfide and carbon dioxide are acidic, the extractant can absorb both, so it is difficult to separate hydrogen sulfide and carbon dioxide

(2) Domestic and foreign studies on the removal of hydrogen sulfide and carbon dioxide in natural gas, dry gas and liquefied petroleum gas have been widely studied, and many models have been established, all of which are in the case of low concentrations of hydrogen sulfide and carbon dioxide. Separation from carbon dioxide, but little research

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