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Composite extractant suitable for removing aromatic hydrocarbon in low-content aromatic hydrocarbon straight-run naphtha and application method thereof

A composite extractant and application method technology, applied in the field of composite extractant, can solve the problems of low reuse and high production cost, and achieve the effect of saving investment

Pending Publication Date: 2021-03-26
NORTH HUAJIN CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The above technologies all use ionic liquids to extract petroleum fractions containing aromatics. Although ionic liquids have the advantages of low saturated vapor pressure and mild operating conditions, their production costs are high and their reuse is low.

Method used

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  • Composite extractant suitable for removing aromatic hydrocarbon in low-content aromatic hydrocarbon straight-run naphtha and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Using N-N-dimethyl sulfoxide as the main solvent, N, N-dimethylformamide (DMF) and propylene carbonate (PC) as co-solvents, a compound extractant was prepared at a mass ratio of 70:20:10.

[0024] The straight-run naphtha with an aromatics content of 9wt% is passed into the pre-fractionator, the pressure is 0.5MPa, the temperature is 100°C, and the light fraction less than 60°C is distilled from the top of the tower, and the bottom product and the fresh composite extractant are in mass ratio 2:1 Extraction and dearomatization are carried out in the dearomatization tower, the extraction pressure is 0.5MPa, and the extraction temperature is 50°C. The non-aromatic components distilled from the top of the dearomatization tower are connected to the water washing tower of the existing aromatics extraction device to form dearomatized naphtha after the solvent is removed, and the aromatic-rich components distilled from the bottom of the tower are connected to the existing aromat...

Embodiment 2

[0026] Using N-N-dimethyl sulfoxide as the main solvent, N, N-dimethylformamide (DMF) and propylene carbonate (PC) as co-solvents, a compound extractant was prepared at a mass ratio of 80:10:10.

[0027] The straight-run naphtha with an aromatics content of 9wt% is passed into the pre-fractionator, the pressure is 0.5MPa, the temperature is 100°C, and the light fraction less than 60°C is distilled from the top of the tower, and the bottom product and the fresh composite extractant are in mass ratio 2:1 Extraction and dearomatization are carried out in the dearomatization tower, the extraction pressure is 0.5MPa, and the extraction temperature is 50°C. The non-aromatic components distilled from the top of the dearomatization tower are connected to the water washing tower of the existing aromatics extraction device to form dearomatized naphtha after the solvent is removed, and the aromatic-rich components distilled from the bottom of the tower are connected to the existing aromat...

Embodiment 3

[0029] Using N-N-dimethylsulfoxide as the main solvent, N,N-dimethylformamide (DMF) and propylene carbonate (PC) as co-solvents, a compound extractant was prepared at a mass ratio of 65:20:15.

[0030] The straight-run naphtha with an aromatics content of 9wt% is passed into the pre-fractionator, the pressure is 0.5MPa, the temperature is 100°C, and the light fraction less than 60°C is distilled from the top of the tower, and the bottom product and the fresh composite extractant are in mass ratio 2:1 Extraction and dearomatization are carried out in the dearomatization tower, the extraction pressure is 0.5MPa, and the extraction temperature is 50°C. The non-aromatic components distilled from the top of the dearomatization tower are connected to the water washing tower of the existing aromatics extraction device to form dearomatized naphtha after the solvent is removed, and the aromatic-rich components distilled from the bottom of the tower are connected to the existing aromatic...

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Abstract

The invention provides a composite extractant suitable for removing aromatic hydrocarbon in low-content aromatic hydrocarbon straight-run naphtha and an application method of the composite extractant.The composite extractant is composed of N-N-dimethyl sulfoxide, N, N-dimethyl formamide (DMF) and propylene carbonate. According to the present invention, the naphtha with the low aromatic hydrocarbon content passes through the pre-fractionation and extraction dearomatization apparatus, and is combined with the aromatic hydrocarbon extraction water washing tower and the aromatic hydrocarbon extraction stripping tower to produce the dearomatized naphtha and the aromatic hydrocarbon product, such that the low aromatic hydrocarbon content naphtha is subjected to dearomatization under the suitable process conditions so as to obtain the high-quality ethylene cracking raw material.

Description

technical field [0001] The invention relates to a composite extractant, in particular to a composite extractant suitable for removing aromatics in straight-run naphtha with low content of aromatics and an application method thereof. Background technique [0002] The raw material cost of steam cracking to produce ethylene accounts for 60%-80% of the total production cost, more than 50% of the cracking raw material of ethylene is naphtha, and the aromatic hydrocarbon component in naphtha accounts for 10wt%, and its diene yield is 0, The presence of aromatics is also easy to generate condensed ring aromatics in the cracking process, which accelerates the coking of the cracking furnace tube, and the removal of aromatics in naphtha saves cracking raw materials and optimizes the operation of ethylene. [0003] For naphtha raw materials with low aromatics content, aromatics can generally be separated by hydrofining, adsorption separation and liquid-liquid extraction dearomatization...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G21/22C10G21/20C10G55/02C10G55/06
CPCC10G21/22C10G21/20C10G55/02C10G55/06C10G2400/30
Inventor 魏丽娟李永华唐明邵维彧张东梅肖大君韩丽君姜海王泽宇黄涛
Owner NORTH HUAJIN CHEM IND CO LTD
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