Supercharge Your Innovation With Domain-Expert AI Agents!

A method for shutting down a hydrocracking unit

A technology of hydrocracking and catalyst, which is applied in the direction of hydroprocessing process, petroleum industry, and hydrocarbon oil treatment, etc., to achieve the effect of reducing the activity damage of hydrocracking catalyst, benefiting long-term operation and prolonging the service life

Active Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method effectively reduces the damage to the activity of the hydrocracking catalyst caused by the shutdown process, and reduces the problem of shortening the service life of the hydrocracking unit after restarting operation

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for shutting down a hydrocracking unit
  • A method for shutting down a hydrocracking unit
  • A method for shutting down a hydrocracking unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The hydrocracking unit used the A / B catalysts in the above Table 2 for normal production, but was shut down due to certain needs. Introduce coker wax oil into the reaction system at an amount of 20 tons / hour, increase the reaction temperature in the refining section by 6°C, and control the nitrogen content of the refined oil to 50mg·g -1 At the same time, anhydrous liquid ammonia is injected at the entrance of the cracking section, and the injection rate is 0.5 tons / hour. At this time, the ammonia concentration in the reaction system increases by about 5400 μL·L -1 , After waiting for 3 hours at constant temperature, the conversion depth of >350°C in the reaction distillate of the cracking section is 48%, cut off the feed to the device, and shut down directly.

Embodiment 2

[0027] The hydrocracking unit used the A / B catalysts in the above Table 2 for normal production, but was shut down due to certain needs. Introduce coker wax oil into the reaction system at an amount of 10 tons / hour, increase the reaction temperature in the refining section by 3°C, and control the nitrogen content of the refined oil to 40mg·g -1 At the same time, anhydrous liquid ammonia is injected at the entrance of the cracking section, and the injection rate is 0.8 tons / hour. At this time, the ammonia concentration in the reaction system increases by about 7900 μL·L -1 , After waiting for 4 hours at constant temperature, the conversion depth of >350°C in the reaction distillate in the cracking section is 49%, cut off the feed to the device, and shut down directly.

Embodiment 3

[0029] The hydrocracking unit used the A / B catalysts in the above Table 2 for normal production, but was shut down due to certain needs. Introduce coker wax oil into the reaction system at an amount of 20 tons / hour, increase the reaction temperature in the refining section by 6°C, and control the nitrogen content of the refined oil to 45mg·g -1 At the same time, anhydrous liquid ammonia is injected at the entrance of the cracking section, and the injection rate is 0.9 tons / hour. At this time, the ammonia concentration in the reaction system increases by about 9200 μL·L -1 , After waiting for 1 hour at constant temperature, the conversion depth of >350°C in the reaction distillate of the cracking section is 48%, cut off the feed to the device, and shut down directly.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
densityaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for shutting down a hydrocracking unit, comprising the following steps: (1) increasing the nitrogen content in raw oil and the reaction temperature in the refining section by 1-10°C, and controlling the nitrogen content in the reaction distillate in the refining section to 30-80 mg g ‑1 ; (2) Inject ammonia gas into the material in the cracking section, and control the ammonia concentration in the gas phase in the cracking section to increase by 5000~20000ml·l ‑1 (3) When the conversion depth of >350°C in the reaction distillate of the cracking section is lower than 55%, preferably 40-50%, the raw material is cut off and the temperature and pressure are lowered. The method effectively reduces the damage to the activity of the hydrocracking catalyst caused by the shutdown process, and reduces the problem of shortening the service period of the hydrocracking unit after restarting operation.

Description

technical field [0001] The invention relates to a method for shutting down a hydrocracking unit, in particular to a method for shutting down a hydrocracking unit which effectively reduces the activity loss of a hydrocracking catalyst. Background technique [0002] Hydrocracking technology is one of the high-quality heavy oil lightening technologies. It has many advantages such as strong adaptability of raw materials, flexible product solutions, high yield of liquid products, and good product quality. increasing trend. The hydrocracking process is under the action of hydrogen, high temperature, high pressure and catalysts to hydrodesulfurize, hydrodenitrogenate, polycyclic aromatic hydrocarbons, hydrosaturation and ring-opening cracking of heavy distillate oils (VGO, CGO, DAO). The process of conversion into target products such as light oil and middle distillates. For the existing hydrocracking unit, its one-cycle operation needs to go through multiple processes such as ca...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/02
CPCC10G67/02C10G2300/4006C10G2300/4012C10G2300/80C10G2300/70
Inventor 王仲义崔哲吴子明柳伟张晓萍
Owner CHINA PETROLEUM & CHEM CORP
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com