Mid distillate hydrocracking

Figure 1. Hydrocracking mid-distillates ( ), COED (A), H-Coal (A), s SRC II and (B), Synthoil.

Table V. Hydrocracking Mid-Distillate COED Oil Yield Patterns (Wt % of Feed)...

Hydrotreat reform hydrodealkylate. b Recycle hydrocrack hydrotreat reform hydrodealkylate. c Recycle hydrocrack gas oil recycle hydrocrack mid-distillate hydrotreat re- ... 

Hydrocracking Mid-Distillate Harshaw HT-400-1/8-E Synthoil Straight-Rim Mid-Distillate... 

Recycle hydrocrack gas oil recycle hydrocrack mid-distillate hydrotreat reform hydrodealkylate. 

Hydrocracking of the mid-distillate and gas oil to produce naphtha and LPGs (3) hydrotreating of the straight run naphtha and hydro-crackate naphtha to remove heteroatoms and (4) reforming of the hydrotreated naphthas to maximize aromatics. 

The catalyst used in the mid-distillate and gas-oil hydrocracking was Harshaw 400T. The COED, H-Coal, and Synthoil samples were run over 1/8-in. extrudates the SRC II sample was run on 1/16-in. extrudates. The catalyst was presulfided in situ with 1% CS2 in a light naphtha. 

Inspections on the four mid-distillates are presented in Table II. The 560°F endpoint for the H-Coal mid-distillate is caused by the fact that the 560° F+ material was delivered as process residue containing the ash and unreacted coal. The residue material was very difficult to distill in a batch system. Scheduling pressures forced the H-Coal hydrocracking runs to be done on the available material. 

Owing to the limited availability of the feedstocks, it was not possible to do parametric studies and then operate at a single set of conditions to provide a hydrocrackate naphtha. All of the hydrocrackate material from a given feedstock was combined, the naphtha distilled, and resultant unconverted mid-distillate subjected to second-pass hydrocracking. 

Catalysis. As of mid-1995, zeoHte-based catalysts are employed in catalytic cracking, hydrocracking, isomerization of paraffins and substituted aromatics, disproportionation and alkylation of aromatics, dewaxing of distillate fuels and lube basestocks, and in a process for converting methanol to hydrocarbons (54). 

Sapre, A. Advanced Distillate Hydroprocessing Technology, 4th Conference on Oil Refinir and Petrochemicals in the Mid e East, Abu Dhabi, January 28,2003 Dolbear, G.E., Hydrocracking Reactions, Catalysts, and Processes, in Petroleum Chemistry and Refining (Speight, J.G. ed.), Taylor Francis Washington, D.C., 1998 Mills, G.A. Heinemann, H. Milliken, T.H. Oblad, A.G. Ind. Eng. Chem. 1953,45,134. 

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