Device and method for extracting acenaphthene and acenaphthylene in LCO bicyclic aromatic hydrocarbon

A technology for bicyclic aromatic hydrocarbons and acenaphthylene, which is applied in the field of devices for extracting acenaphthylene and acenaphthylene in LCO bicyclic aromatic hydrocarbons, which can solve the problems of large equipment investment, high production cost, and complicated process, and achieve the effect of reducing production costs and simple structure

Active Publication Date: 2019-03-08
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Apparently, the traditional method of processing acenaphthylene requires complicated process, 3 to 4 rectification towers to cut fractions and briefly crystallize, which has the problems of large eq...

Method used

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  • Device and method for extracting acenaphthene and acenaphthylene in LCO bicyclic aromatic hydrocarbon
  • Device and method for extracting acenaphthene and acenaphthylene in LCO bicyclic aromatic hydrocarbon
  • Device and method for extracting acenaphthene and acenaphthylene in LCO bicyclic aromatic hydrocarbon

Examples

Experimental program
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Embodiment 1

[0039] The present invention extracts acenaphthylene and acenaphthylene in LCO bicyclic aromatic hydrocarbons after LCO removes fractions such as dimethylnaphthalene and anthracene, and extracts from remaining fractions mainly acenaphthylene and acenaphthylene and a small amount of dimethylnaphthalene, mainly acenaphthylene and acenaphthylene The alkene content is 96.86%, and the dimethylnaphthalene content is 3.13%.

[0040] Among them, the device for removing dimethylnaphthalene and anthracene by LCO is as follows: image 3 As shown, the device for removing dimethylnaphthalene by LCO includes a vacuum sideline rectification tower 42, an extraction tower 43 and a solvent regeneration tower 44 connected in sequence.

[0041] Wherein, the middle and lower end of the vacuum sideline rectification column 42 is provided with a bicyclic aromatic hydrocarbon mixed liquid feed port 45, the middle and upper end is provided with a dimethyl fraction discharge port 46, and the top is pro...

Embodiment 2

[0070] The basic steps are the same as in Example 1. Under the condition that other conditions remain unchanged, the influence of the amount of feed material ① on the content and yield of acenaphthylene and acenaphthylene is studied, and the obtained results Figure 6 shown. It can be seen from the figure that when the amount of feedstock ① is small, the purity is higher, but the yield remains basically unchanged; while when the amount of feedstock is larger, the purity decreases, but the yield increases; however, in the comprehensive purity and yield Under certain conditions, the feed rate of raw materials is 3.6Kg / h.

Embodiment 3

[0072] The basic steps are the same as in Example 1, and under the condition that other conditions are constant, research stirring speed affects the content and yield of acenaphthylene and acenaphthylene, and the obtained results are as follows: Figure 7 shown. It can be seen from this figure that when the stirring speed is small, the purity is low and the yield is high, and when the stirring speed increases, the purity is slightly improved, but the yield is basically unchanged. Comprehensive purity and yield, stirring speed is 550rpm optimal.

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Abstract

The invention discloses a device and method for extracting acenaphthene and acenaphthylene in LCO bicyclic aromatic hydrocarbon. The device comprises an extraction rectifying tower, a regeneration tower, a crystallizing device, a washer and a sidestream rectifying tower. The method comprises the following steps: during preparation, firstly, adding a mixed liquid containing acenaphthene and acenaphthylene and an extractant from a raw material feed inlet and an extractant feed inlet of the extraction rectifying tower for extraction and rectification; feeding a fraction containing the extractantand dimethylnaphthalene into the regeneration tower for regeneration; recycling the regenerated extractant fraction to the extraction rectifying tower; feeding the fraction containing acenaphthene andacenaphthylene at the bottom of the extraction rectifying tower into the crystallizing device; adding a crystallizing solution for crystallization at the same time; feeding the obtained coarse acenaphthene into the washer; washing the coarse acenaphthene to obtain crystal acenaphthene; feeding the crystallizing mother liquor and washing agent mother liquor into the sidestream rectifying tower tobe rectified to obtain an acenaphthylene fraction; and recycling the crystallizing solvent to the crystallizing device and the washer. According to the device, the purity and the yield of acenaphtheneseparately reach 99.57% and 80.60% and the purity and the yield of acenaphthylene separately reach 98.53% and 77.59%.

Description

technical field [0001] The invention belongs to the field of extraction of acenaphthylene and acenaphthylene, in particular to a device and a method for extracting acenaphthylene and acenaphthylene in LCO bicyclic aromatic hydrocarbons. Background technique [0002] Catalytic cracking light cycle oil (LCO) is one of the main by-products of the catalytic cracking process. It has high aromatic content and low cetane number. It needs to be hydrotreated before it can be used as a blending component of diesel. As a diesel blend oil, LCO accounts for about 30% of the total amount of diesel oil. It contains monocyclic, bicyclic and tricyclic aromatic hydrocarbons. The total aromatic content reaches 80-90%. The ring accounts for 35%. At present, my country's gasoline consumption is growing rapidly, with an annual growth rate of more than 8%. The consumption-diesel-gasoline ratio has been declining since reaching a peak of 2.27:1 in 2005, and dropped to 1.64:1 in 2014. In the next ...

Claims

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Application Information

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IPC IPC(8): C07C7/00C07C7/08C07C7/14C07C13/547
CPCC07C7/005C07C7/08C07C7/14C07C2603/20C07C13/547
Inventor 顾正桂曹晓艳凌鸿钰
Owner NANJING NORMAL UNIVERSITY
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