Mercaptans removal apparatus for light oil and mercaptans removal method thereof

Abstract

The invention discloses a device for removing mercaptans in light oil. The device comprises a first mixture, a separating tank and an alkali liquor circulating system, wherein a front end of the first mixture is provided with a raw material inlet pipe and an air pipe; the alkali liquor circulating system comprises a first circulating alkali inlet pipe and a circulating alkali liquor outlet pipe; the separating tank is provided with a fine light oil outlet pipe; the circulating alkali liquor outlet pipe is connected with the separating tank; the raw material inlet pipe is provided a second mixer; a front end of the second mixture is provided with a second circulating alkali inlet pipe; a liquid film mass transfer reactor is arranged above the separating tank; a rear end of the first mixer is connected with an upper end pipe of the liquid film mass transfer reactor, and the first circulating alkali liquor inlet pipe is connected with a top end pipe of the liquid film mass transfer reactor. The invention also discloses a method for removing mercaptans. The device and the method have advantages of small amount of circulating alkali, low energy consumption, low production cost, high quality of the fine light oil and simple structure.

Description

technical field [0001] The invention relates to oil refining and chemical industry, in particular to a sweetening device and method for light oil products. Background technique [0002] The raw materials of light oil products (gasoline, kerosene, naphtha, etc.) usually contain relatively high content of mercaptans. Mercaptans are more harmful. Not only will they produce disgusting odors, which have adverse effects on the environment and human life, but they are also easy to oxidize, which has a great impact on the oxidation stability of oil products. Therefore, during the processing of light oil products, it is often necessary to remove mercaptans in oil products or convert them into less harmful disulfides. Due to the foul smell of mercaptans, the sweetening process is usually referred to as the deodorization process in the oil refining industry. [0003] In recent years, with the country's emphasis on environmental protection, the requirements for mercaptan content in li...

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Problems solved by technology

[0021] 2) Although there is a coalescer, the refined gasoline, in most cases, does not meet the requirements of the gasoline doctor's test, that is, a small amount of lye is entrained in the refined gasoline;

[0022] 3) In the case of large air injection volume, cavitation will be formed in the fiber membrane contactor, which will affect the effect of gasoline sweetening. At the same time, the gas needs to be discharged from the contactor, which increases the refining operation intensity and energy consumption

[0023] 4) The device requires that the temperature of the input raw material is not lower than 40°C, so the device consumes a lot of energy

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