System and process for removing crude and light pyridine

Abstract

The invention relates to an ammonia recovery unit of a coal gas purification device in the coking industry, in particular to a crude light pyridine removal system and process. The light pyridine removal system comprises a crystallization tank, a centrifuge, a neutralizing tank and a mother liquor separation tank, the crystallization tank is connected with the centrifuge through a pipeline, the centrifuge is connected with the bottom of the neutralizing tank through a pipeline, and the ammonia pipeline is connected with the bottom side wall of the neutralizing tank; the mother liquor separation tank is a horizontal tank and is internally provided with a middle partition plate which divides the mother liquor separation tank into a left section and a right section; and the top of the neutralizing tank is connected with the top of the left-end horizontal tank through a pipeline, an ammonium sulfate mother liquor delivery pipeline is arranged at the bottom of the left-end horizontal tank, a pyridine delivery pipeline is arranged at the bottom of the right-end horizontal tank, and a tail gas delivery pipeline is arranged at the top of the right-end horizontal tank. The process is simple, unnecessary procedures are reduced, and the reaction is complete; and equipment related to sulfuric acid spraying and washing is saved, and the production cost is reduced.

Description

technical field [0001] The invention relates to an ammonia recovery unit of a gas purification device in the coking industry, in particular to a system and process for removing coarse and light pyridine. Background technique [0002] Pyridine is a nitrogen-containing organic compound that is a by-product of the coal coking process. Generally, dry coal contains about 2% nitrogen, of which 40-50% enters the raw coal gas, most of which form ammonia, and a small part form hydrogen cyanide and pyridine. Pyridine accounts for about 1.2-1.3% of the nitrogen content in coal. [0003] Pyridine is divided into crude light pyridine and crude heavy pyridine. Crude light pyridine is an oily liquid with a special smell, with a boiling point range of 115-160°C. It is mainly used for the production of pyridine and α-picoline. Crude heavy pyridine is an odorous brown oily liquid. , boiling point range 170 ~ 280 ℃, mainly used for the production of quinoline. [0004] After the gas is init...

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Problems solved by technology

[0007] CN101973931B discloses "a method for extracting pyridine from ammonium sulfate mother liquor". It is a method for extracting pyridine using the above principle, but it uses an empty shell neutralizer, and the subsequent bubbling reactor adopts the method of extracting pyridine in the gas phase. Removal of water in the gas phase requires rectification, the process is cumbersome, and the reaction temperature is high, corrosive, and heating is not conducive to the reaction, because the reaction is an exothermic reaction, and lowering the reaction temperature is conducive to the reaction. The reactor adopts the method of forced stirring, and the reaction is cooled at the same time. Compared with the shell reactor plus the bubbling reactor, the reaction will be more complete, and the liquid pyridine can be directly obtained, and the liquid pyridine can be directly separated from the oil and water. The process will Shorter, the product quality meets the requirements of the subsequent process, but the neutralization tank is slightly complicated

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