Technology for producing low-sulfur marine fuel oil by external circulation wax oil fixed bed hydrotreatment

Abstract

A technology for producing low-sulfur marine fuel oil by external circulation wax oil fixed bed hydrotreatment comprises the following steps: new hydrogen and circulating hydrogen are mixed and heated, the obtained heated hydrogen is divided into two parts, the first part is mixed with heated wax oil in a first-stage high-efficiency gas-liquid mixing distributor, the obtained mixture enters the first-stage catalyst bed layer of a fixed bed, the obtained product enters the second-stage catalyst bed layer of the fixed bed, a second part is mixed with a liquid-phase product at the bottom of a first-stage high-pressure separator in a second-stage high-efficiency gas-liquid mixing distributor, then the obtained mixture enters the second-stage catalyst bed layer of the fixed bed, the bottom product of the reactor enters the first-stage high-pressure separator, the top gas-phase product of the first-stage high-pressure separator enters the second-stage high-pressure separator, a part of the bottom liquid-phase product of the first-stage high-pressure separator returns to the catalyst bed layer, the remaining bottom liquid-phase product is discharged as a first fuel oil product; and a partof the top gas-phase product of the second-stage high-pressure separator returns as circulating hydrogen, the bottom product of the second-stage high-pressure separator is mixed with the first fuel oil product, and the obtained mixture is discharged as a second fuel oil product. The technology reduces the operating strictness and the operating cost.

Description

technical field [0001] The invention belongs to the field of petrochemical technology, and in particular relates to a process for producing low-sulfur marine fuel oil through hydrogenation treatment of an external circulation type wax oil fixed bed. Background technique [0002] At present, the fixed bed hydrogenation technology has high operating severity and high operating cost, and the economical efficiency of producing marine fuel oil is poor, which makes the low-severity, low-cost production of low-sulfur clean marine fuel oil production technology blank. [0003] In view of this, it is necessary to propose improvement measures for the existing hydrogenation technology to produce marine fuel oil, reduce the operating severity of the device, and improve economic benefits. Contents of the invention [0004] In order to overcome the shortcomings of the prior art, the object of the present invention is to provide a process for producing low-sulfur marine fuel oil through ...

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Problems solved by technology

[0002] At present, the fixed bed hydrogenation technology has high operating severity and high operating cost, and the economical efficiency of producing marine fuel oil is poor, which makes the low-severity, low-cost production of low-sulfur clean marine fuel oil production technology blank.

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