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Systems and processes for suppressing heavy polynuclear aromatic deposition in a hydrocracking process

An aromatic compound, hydrocracking technology, applied in hydrotreating process, chemical instrument and method, chemical/physical process, etc., can solve the problem of high cost

Inactive Publication Date: 2022-01-07
SAUDI ARABIAN OIL CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Each of these treatments is costly

Method used

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  • Systems and processes for suppressing heavy polynuclear aromatic deposition in a hydrocracking process
  • Systems and processes for suppressing heavy polynuclear aromatic deposition in a hydrocracking process
  • Systems and processes for suppressing heavy polynuclear aromatic deposition in a hydrocracking process

Examples

Experimental program
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Effect test

Embodiment 1

[0098] A hydrocracking unit configured with a single-pass configuration with recycle, having two reactors, was used to process a feedstock at 30,000 barrels per continuous operating day (BPSD) of 15% A mixture of demetallized oil and 85% vacuum gas oil. The first stage operates at a temperature of 404°C and a hydrogen partial pressure of 115 bar. In the first stage, the conversion under these conditions was 50% by volume. The operating temperature of the second stage was 375° C., resulting in a conversion of 25% by volume, for a total conversion including recycle of 95% by volume. The unit typically yields: 41.2 volume percent total naphtha with a research octane number of 60; and 49.1 volume percent middle distillate with a cetane index (determined using ASTM D976) of 56. Aromatic solvent comprising about 2000 BPSD full range aromatic bottoms from the aromatics recovery complex is mixed with the effluent from the second stage reactor to disperse the HPNA formed in the proce...

Embodiment 2

[0100] A 7.2 g sample containing 1,000 ppm of HPNA from the recycle stream of the hydrocracking unit was mixed with 12.7 g of aromatic solvent from the aromatic bottoms stream of the aromatics recovery complex. Prior to mixing, precipitated HPNA was visually observed in the recirculation flow as particles in the recycle flow and as deposits on the walls of the vials containing the samples. After mixing the aromatic solvent and the recycle stream sample, the precipitated HPNA and sediment dissolved and were no longer visible.

Embodiment 3

[0102] A 9.5 g sample of the recycle stream from the hydrocracking unit was mixed with 17.7 g of n-pentane solvent to precipitate HPNA. A precipitate of HPNA can be seen. To this suspension was added 85.0 g sample of aromatic solvent from the aromatic bottoms stream of the aromatics recovery complex. Addition of aromatic solvent dissolved the HPNA precipitate and prevented further precipitation of HPNA.

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PUM

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Abstract

The disclosure describes refinery processes and process units for suppressing the precipitation and deposition of heavy polynuclear aromatic (HPNA) compounds in a process unit of a refinery, by combining the effluent from a hydrocracking unit with an aromatic solvent stream. Certain costly HPNA treatment processes can be eliminated, downtime can be reduced, and overall distillate yield can be increased by suppressing HPNA precipitation. The aromatic bottoms-which are suitable solvents for this purpose-of an aromatic recovery complex can be used in certain embodiments to dissolve HPNAs and suppress HPNA precipitation.

Description

technical field [0001] The present disclosure relates to a hydrocracking process, and more particularly to dissolving or inhibiting the precipitation of heavy polynuclear aromatic compounds in the hydrocracking process. Background technique [0002] The hydrocracking process is used commercially in numerous refineries. Typically, the hydrocracking process splits the compounds of the feed into lighter compounds of higher average volatility and economic value. The hydrocracking process improves the quality of hydrocarbon feedstocks by increasing the hydrogen-to-carbon ratio and by removing organic sulfur and organic nitrogen compounds. [0003] Typical hydrocracking feed streams contain small amounts of polynuclear aromatic (PNA) compounds; aromatic compounds containing less than seven fused benzene rings. When hydrocracking a feed stream at high temperature and pressure, heavy polynuclear aromatic (HPNA) compounds tend to form and are present in high concentrations in uncon...

Claims

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Application Information

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IPC IPC(8): C10G47/00C10G65/10C10G65/12C10G75/04
CPCC10G47/00C10G65/12C10G65/10C10G2300/208C10G2300/708C10G2300/1096C10G75/04B01J4/001B01J19/245B01J2219/185B01J2219/24C10G67/0445C10G67/14C10G2300/201C10G2300/80
Inventor 奥默·里法·克赛奥卢罗伯特·彼得·霍奇金
Owner SAUDI ARABIAN OIL CO
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