A method for regenerating crude benzene absorption unit by circulating washing oil

An absorption device and oil washing technology, which is applied in the field of coal chemical industry, can solve problems such as large losses, and achieve the effects of avoiding losses, low crystallization point, and improving economic benefits

Active Publication Date: 2015-10-21
HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the method of recycling washing oil distillation and regeneration cannot fundamentally solve the environmental pollution of washing oil residues, and the technological problems such as the large loss of circulating washing oil during the regeneration process.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、2

[0022] The crude benzene absorption unit uses coal tar as washing oil.

[0023] Add 50ppm of polymerization inhibitor to the recycled washing oil (lean oil) accounting for 1% and 8% of the total circulating washing oil (lean oil) respectively, and then mix it with hydrogen and enter the hydrogenation refining system equipped with pre-hydrogenation and main hydrogenation catalysts. In the reactor, desulfurization, denitrogenation, olefin saturation and partial saturation of polycyclic aromatic hydrocarbons are carried out; the resulting oil after hydrofining is recycled back to the crude benzene absorption unit as recycled washing oil after regeneration. Table 1 shows the physical and chemical properties of the recycled oil lean oil, Table 2 shows the process conditions of hydrofining, and Table 3 shows the properties of the recycled washed oil.

Embodiment 3、4

[0025] The crude benzene absorption unit uses petroleum straight-run diesel oil (distillation at 280-350°C) as washing oil.

[0026] Respectively, 12% and 20% of the total amount of recycled washing oil lean oil was used as regenerated washing oil, and 50 ppm of polymerization inhibitor was added, and the others were the same as in Examples 1 and 2.

[0027] Table 1 Physicochemical properties of circulating washing oil lean oil

[0028] project Example 1, 2 Example 3, 4 Circulating oil washing raw materials Coal tar wash oil oil wash Exterior color black yellow Density, kg / m3 1056.5 880.4 Viscosity (20°C), mm 2 / s 35.2 4.4 Distillation range, ℃ HK~10% 233～248 272～281 40%～50% 255～267 288～295 80%～90% 275～289 312～323 95%~KK 299～305 334～345 Naphthalene content, % 10.2 / Phenol content, % 0.3 / Total sulfur, % 0.58 0.12 Total nitrogen, % 0.61 0.09

[0029] Table 2 Hydr...

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

No PUM Login to view more

Abstract

The invention discloses a regeneration method of cyclic wash oil of a crude benzene absorption unit, which comprises steps as follows: cyclic wash oil rich oil of a crude benzene absorption unit is separated into crude benzene and cyclic wash oil lean oil by a benzene removal tower; by using the cyclic wash oil lean oil to be regenerated as a hydrogenation raw material, a polymerization inhibitor is added, and the hydrogenation raw material and the polymerization inhibitor are mixed with hydrogen and enter a hydrofining reactor to be subjected to hydrofining desulfurization, denitrification and alkene saturation; and oil generated by hydrofining is circulated to the crude benzene absorption tower as regenerated wash oil. The invention effectively avoids loss of wash oil; the regenerated cyclic wash oil has good quality and can not generate environment-polluting residues; and thus, the method is an environment-friendly green technique. Besides, the unit operation is stable in the regeneration process, and the operation cycle is up to more than 1000 hours.

Description

technical field [0001] The invention belongs to the field of coal chemical industry, and in particular relates to a method for circulating oil washing and regeneration in the crude benzene absorption process of coal chemical enterprises. Background technique [0002] Crude benzene is a light distillate oil (distillation range IBP ~ 200°C) recovered from coal coking crude gas, the main component is single-ring aromatic hydrocarbons, in addition, it also contains some unsaturated compounds, sulfides and a small amount of phenols and pyridine bases. The content of benzene, toluene and xylene in crude benzene accounts for more than 90%, of which benzene accounts for about 70%, toluene 8%-25%, and xylene 2%-5%. Crude benzene can be processed through hydrotreating and extractive distillation to obtain high-quality aromatic products such as benzene, toluene, and xylene. [0003] The methods for recovering crude benzene from coke oven gas include oil washing absorption method, ads...

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): C10G45/02C10G45/32C10K1/18
Inventor 李庆华佘喜春刘呈立
Owner HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap