Hydrotreating Objectives

Removal of the objectionable odors due to the presence of H2S and mercaptans is the objective of the fuel sweetening process. Several methods can be utilized to remove these undesirable compounds including caustic washing, copper chloride sweetening, sulfuric acid treating, Merox processing, and hydrotreating. These methods will be discussed below. 

Hydrotreating facilities may be integrated with the hydroconversion section or built on a stand-alone basis, depending on product quality objectives and owner preference. 

The program was broken down into several distinct tasks in order to accomplish these objectives. First, a literature survey was performed to gather articles pertinent to the hydrotreating and hydrocracking of SRC as well as information on analytical methods for the characterization of SRC and its derivatives. 

The objective of Task 1 is to compare the denitrogenation capability of three pairs of active metals (Co-Mo, Ni-Mo, and Ni-W) which are being used commercially for hydrotreating and hydrocracking of petroleum. 

The objective of this process is the deep desulfurization of middistillate types of feedstocks. Exxon licensed hydrotreating units in the past, but decided that a new technology had to be developed for deep desulfurization of diesel oil. Main differences from the existing technology is the different desulfurization kinetics for deep desulfurization and the importance of a good... 

A stripper column in a naphtha hydrotreating process unit needs to remove H2S, which is corrosive and could poison the catalyst in a downstream naphtha reforming unit. Another objective is to remove as much C5 as possible from the stripper bottom, as C5 does not contribute to the naphtha reforming reaction. 

For fixed-bed hydroprocessing units, the process conditions - pressure, temperature, space velocity, and catalyst - are determined by feed quality and process objectives. Table 12 shows typical process conditions for the hydrotreating of different feeds in fixed-bed hydrotreating units. The values shown are approximate. 

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