Deoxidation method of naphtha raw material

Abstract

The invention discloses a deoxidation method of a naphtha raw material. The method comprises the following flows: (1) the raw material naphtha is heated by a heater and enters a deoxygenation tower, and in the raw material heater, the raw material naphtha is heated by a low temperature heat source; (2) reformed PSA desorbed gas is introduced into the deoxygenation tower, light components in the raw material naphtha and oxygen dissolved in the naphtha are evaporated to a tower top together, the oxygen is cooled at the tower top, formed light component condensate liquid is pumped into the towerfor forming total reflux, noncondensable gas enters a low pressure gas system, and the noncondensable gas comprises reformed PSA desorbed gas which is injected into the deoxygenation tower, oxygen desorbed from the naphtha, and light components which are not condensed; deoxidized naphtha formed after deoxidation enters the reforming prehydrogenation system. The deoxidation method employs a low temperature heat source as a heating source of naphtha, and at the same time, partial pressure of the naphtha is reduced, oxygen in the naphtha is easy to overflow from naphtha, so that deoxidation costof the naphtha is effectively reduced.

Description

technical field [0001] The invention relates to a reforming process of naphtha, in particular to a method for deoxidizing naphtha raw material. Background technique [0002] Due to insufficient raw materials, some naphtha reforming units need to purchase raw materials or process them in one place from different places within the same company. During this transportation, naphtha will be more or less exposed to air, while naphtha Once the oil has a trace amount of oxygen, it is very easy to react with the unstable components in the naphtha in the pre-hydrogenation unit of the reforming unit, thereby generating scale at the top of the reactor, resulting in an increase in the pressure drop of the reactor, which is It is necessary to reduce the output of the reforming unit until all the units are shut down. In severe cases, the unit needs to be shut down once a month. [0003] To solve the above problems, refinery engineers designed a deoxygenation unit, see figure 2 , figure ...

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Problems solved by technology

[0005] The above-mentioned deoxygenation device has successfully solved the fouling phenomenon at the top of the reactor, but when the above-mentioned deoxidation device is used for deoxidation, the raw naphtha is heated in the same deoxidation tower 103, and the light components in the naphtha are vaporized In the process of removing oxygen, the heating source at the bottom of the tower is steam. During the deoxygenation process, the temperature at the bottom of the deoxygenation tower needs to be kept at 120-160°C. Although the deoxygenated naphtha 107 exchanges heat with the raw naphtha 101 Part of the heat is recovered, but the amount of steam consumed is still large, which makes the deoxygenation cost of naphtha remain high

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