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Method for co-producing o-xylene and p-xylene adsorption separation apparatus 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 increased energy consumption, and achieve a reduction in comprehensive Energy consumption and the effect of reducing equipment investment

Active Publication Date: 2019-04-23
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-producing o-xylene and p-xylene adsorption separation apparatus feed
  • Method for co-producing o-xylene and p-xylene adsorption separation apparatus feed
  • Method for co-producing o-xylene and p-xylene adsorption separation apparatus feed

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Embodiment approach

[0034] According to the first preferred embodiment of the present invention, the C8 and above aromatics raw materials prepared by the reforming unit are used to produce the feed of the PX adsorption separation device, and the C8 and above aromatics raw materials prepared by the disproportionation unit and / or isomerization unit are used to produce PX adsorption separation device feeds, and at the same time takes into account the production of o-xylene. Among the C8 and above aromatic hydrocarbon raw materials produced by the reforming unit, the total amount of C8 and above aromatic hydrocarbon raw materials is used as the reference C9 + Accounting for 40-60% (weight), o-xylene accounts for 10-15%; in the C8 aromatics prepared by the disproportionation unit, the total amount of C8 and above aromatics raw materials is used as the benchmark C9 + It accounts for 30-45% (by weight), and o-xylene accounts for 10-17%; in the C8 aromatics prepared by the isomerization unit, the total a...

Embodiment 1

[0050] Such as figure 1As shown, the C8 and above aromatics raw material 19 prepared by the disproportionation unit and the C8 and above aromatics raw material 11 prepared by the isomerization unit are sent to the first xylene fractionation tower 1, and the first xylene fractionation tower 1 is operated at a pressure of 1.3MPag. The 514t / h overhead fraction 12 is used as the feed to the adsorption separation device, of which 500ppm are C9 aromatics and the rest are C8 aromatics. Extract 50t / h tower bottom fraction 13, containing 25.1% o-xylene, enter o-xylene fractionation tower 3, extract 13t / h tower top fraction 17 to obtain o-xylene product, the product purity is more than 98%. The C8 and above aromatics raw material 16 prepared by the reforming unit enters the second xylene fractionation tower 2, and the second xylene fractionation tower 2 is operated at a pressure of 0.4 MPag, and an 82t / h tower overhead fraction 17 is extracted as a feed to the adsorption separation devi...

Embodiment 2

[0054] Such as figure 2 shown, press figure 2 The method exemplified in the distribution of C8 and above aromatics feedstock from three different sources, the first xylene fractionator 4 is operated at a pressure of 0.3 MPag, and the second xylene fractionator 5 is operated at a pressure of 1.3 MPag. In the case of the same amount of feed and product properties, and figure 1 Compared to the method in the example, figure 2 The exemplified method has similar energy consumption and lower investment by 1%.

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Abstract

The invention relates to the field of aromatic hydrocarbon production, particularly to a method for co-producing o-xylene and a p-xylene adsorption separation apparatus feed. The method comprises: distributing C8 and above aromatic hydrocarbon raw materials prepared by a disproportionation device, an isomerization device and a reforming device, separately feeding into the first xylene fractionation tower and the second xylene fractionation tower in a p-xylene production device, and carrying out fractionation, wherein the tower top distillate of the first xylene fractionation tower and the tower top distillate of the second xylene fractionation tower are the p-xylene adsorption separation apparatus feed; and feeding the tower bottom distillate of the first xylene fractionation tower into ano-xylene fractionation tower, and carrying out further fractionation, wherein the obtained tower top distillate is the o-xylene product, the first xylene fractionation tower and the second xylene fractionation tower adopt different operating pressures, and at least one part of the tower top condensation heat of the high-pressure xylene fractionation tower is used as the reboiled heat source of the low-pressure toluene fractionation tower. With the method of the present invention, the comprehensive energy consumptions of the xylene fractionation tower and the o-xylene fractionation tower are substantially reduced.

Description

technical field [0001] 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. Background technique [0002] Ortho-xylene (OX) is one of several xylene isomers obtained from the conversion of aromatics streams produced 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] Ortho-xylene is usually obtained from mixed xylenes by separation. Xylene has a wide range of sources. The mixed xylene obtained from the refinery comes from the reforming unit, and the p-xylene obtained from the aromatics complex can also be co-produced with ortho-xylene. Due to the different composition of C9 aromatics in C8 and above mixed aromatics produced by different devices, the separation difficulty of o-xylene and p-xylene is different. ...

Claims

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Application Information

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Patent Type & Authority Applications(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