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Method for Co-production of Ortho-Xylene and Para-Xylene Adsorptive Separation Unit Feed

A technology of p-xylene and o-xylene, which is applied in the field of co-production of feed materials for o-xylene and p-xylene adsorption and separation devices, can solve the problems of increased equipment investment, high energy consumption, and enlarged equipment specifications, and achieve reduction Comprehensive energy consumption and the effect of reducing equipment investment

Active Publication Date: 2022-05-24
SINOPEC ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the two xylene towers use the same operating pressure, an increase in operating pressure will increase the difficulty of material separation and increase equipment specifications, resulting in increased energy consumption and equipment investment
[0005] It can be seen that the prior art o-xylene fractionation tower and xylene fractionation tower have the problem of high energy consumption respectively, therefore, it is urgent to develop a method for reducing the comprehensive energy consumption of o-xylene fractionation tower and xylene fractionation tower

Method used

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  • Method for Co-production of Ortho-Xylene and Para-Xylene Adsorptive Separation Unit Feed
  • Method for Co-production of Ortho-Xylene and Para-Xylene Adsorptive Separation Unit Feed
  • Method for Co-production of Ortho-Xylene and Para-Xylene Adsorptive Separation Unit Feed

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Embodiment approach

[0034] According to the first preferred embodiment of the present invention, the C8 and above aromatic hydrocarbon raw materials prepared by the reformer are used to produce the feed of the PX adsorption and separation device, and the C8 and above aromatic hydrocarbon raw materials prepared by the disproportionation device and / or the isomerization device are used to produce PX adsorption and separation device feed, while taking into account the production of ortho-xylene. In the C8 and above aromatic hydrocarbon raw materials prepared by the reformer, the total amount of C8 and above aromatic hydrocarbon raw materials is the benchmark C9 + It accounts for 40-60% by weight, and o-xylene accounts for 10-15%; in the C8 aromatics prepared by the disproportionation device, the total amount of C8 and above aromatics raw materials is the benchmark C9 + It accounts for 30 to 45% by weight, and o-xylene accounts for 10 to 17%; in the C8 aromatics prepared by the isomerization device, t...

Embodiment 1

[0050] like figure 1As shown, the C8 and above aromatic hydrocarbon raw materials 19 prepared by the disproportionation device and the C8 and above aromatic hydrocarbon raw materials 11 prepared by the isomerization device are sent to the first xylene fractionating tower 1, and the first xylene fractionating tower 1 is operated at a pressure of 1.3MPag, and is extracted The 514t / h overhead fraction 12 is used as the feed for the adsorption separation device, in which the C9 aromatics are 500ppm and the rest are C8 aromatics. Extract 50t / h of bottom fraction 13, containing 25.1% o-xylene, into o-xylene fractionation tower 3, and extract 13t / h of tower top fraction 17 to obtain o-xylene product with a product purity of over 98%. The C8 and above aromatic hydrocarbon raw materials 16 prepared by the reformer enter the second xylene fractionation tower 2, and the second xylene fractionation tower 2 is operated at a pressure of 0.4MPag, and 82t / h overhead fraction 17 is extracted a...

Embodiment 2

[0054] like figure 2 shown, press figure 2 The method exemplified in distributes three different sources of C8 and above aromatic hydrocarbon feedstocks, the first xylene fractionator 4 is operated at 0.3MPag pressure, and the second xylene fractionator 5 is operated at 1.3MPag pressure. Under the condition that the amount of feed and the properties of the product remain unchanged, with figure 1 Compared to the method exemplified in figure 2 The example method has similar energy consumption and lower investment by 1%.

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Abstract

The invention relates to the field of aromatics production, in particular to a co-production method for feeding materials to an adsorption and separation device for o-xylene and p-xylene. Including: distributing the C8 and above aromatics raw materials prepared by the disproportionation unit, isomerization unit and reforming unit, and sending them to the first xylene fractionation tower and the second xylene fractionation tower in the p-xylene production unit for fractionation; The top fraction of the first xylene fractionation tower and the overhead fraction of the second xylene fractionation tower are feeds for the p-xylene adsorption separation device; the bottom fraction of the first xylene fractionation tower is sent to the o-xylene fractionation tower for further fractionation The obtained overhead fraction is o-xylene product; the first xylene fractionation tower and the second xylene fractionation tower adopt different operating pressures, and at least a part of the heat of condensation at the top of the xylene fractionation tower that adopts high pressure is used as the second xylene fractionation tower that adopts low pressure. Reboiling heat source for toluene fractionation tower. The method of the invention greatly reduces the comprehensive energy consumption of the xylene fractionation tower and the o-xylene fractionation tower.

Description

technical field [0001] The invention relates to the field of aromatic hydrocarbon production, and more particularly, to a method for co-production of feeds of ortho-xylene and para-xylene adsorption and separation devices. Background technique [0002] O-xylene (OX) is one of several xylene isomers obtained from the production of aromatic hydrocarbon streams in refineries or olefin units. It is a chemical raw material for the production of phthalic anhydride, dyes, pesticides, etc., and has important industrial application value. . [0003] Orthylene is usually produced by separation from mixed xylenes. The sources of xylene are wide. The mixed xylene obtained from the refinery comes from the reformer, and the mixed xylene obtained from the aromatics complex unit is para-xylene, which can co-produce ortho-xylene. Due to the different compositions of C9 aromatics in the C8 and above mixed aromatics produced by different units, the separation difficulty of ortho-xylene and p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/00C07C7/04C07C7/12C07C15/08B01D3/14
CPCB01D3/007B01D3/143C07C7/005C07C7/04C07C7/12C07C15/08Y02P20/52
Inventor 姜晓花刘永芳王婷朱艳
Owner SINOPEC ENG