Unlock instant, AI-driven research and patent intelligence for your innovation.

Method of converting ethylbenzene and process for producing p-xylene

A technology for the conversion of ethylbenzene, which is applied in organic chemical methods, chemical instruments and methods, and the purification/separation of hydrocarbons, etc., can solve the problems of catalyst life, poor raw material unit consumption, increased catalyst degradation speed, and accelerated catalyst degradation speed etc. to achieve the effects of reducing xylene loss, improving energy unit consumption, and reducing ethylbenzene circulation

Inactive Publication Date: 2013-06-12
TORAY IND INC
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0027] These methods are all the same as the isomerization reaction of the "separation-isomerization cycle" in terms of converting ethylbenzene into benzene and ethane by dealkylation reaction, but in the case of using the former, since the feed material is not The C8 aromatic hydrocarbons circulated in the "separation-isomerization cycle" are diluted, so especially when pyrolysis gasoline containing a large amount of non-aromatic hydrocarbons is used as the feed material, the amount of xylene loss is extremely increased, and the deterioration rate of the catalyst is also reduced. In the case of using the latter, although the feed material is diluted by the C8 aromatic hydrocarbons circulating in the "separation-isomerization cycle", the feed amount of the feed material to the xylene isomerization process increases, so there is even There is a slight deterioration in the loss of xylene, which has a greater impact on the unit consumption of raw materials.
That is, in the case of using pyrolysis gasoline containing a large amount of non-aromatic hydrocarbons, if the prior art is used, the degradation rate of the catalyst will increase rapidly, and the loss of xylene will also increase, so there will be a significant change in catalyst life and raw material consumption Therefore, these methods cannot be used in the case of using a large amount of pyrolysis gasoline, etc. that contain ethylbenzene and want to reduce the amount of ethylbenzene recycled in the "separation-isomerization cycle"

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method of converting ethylbenzene and process for producing p-xylene
  • Method of converting ethylbenzene and process for producing p-xylene
  • Method of converting ethylbenzene and process for producing p-xylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0147] The above-mentioned catalyst A was filled into a reaction tube to conduct a reaction test. The compositions, reaction conditions, and test results of the supplied raw materials used are shown in Table 1 below. In addition, compositional analysis of the feed materials and reaction products was carried out using three gas chromatographs equipped with hydrogen flame detectors. The separation column is as follows.

[0148] (1) Gas composition (composition from methane to n-butane in gas):

[0149] Filler: "Unipak S" ("Unipak S" (trademark)) 100-150 mesh,

[0150] Column: stainless steel length 4m inner diameter 3mmφ

[0151] N 2 : 1.65kg / cm 2 -G

[0152] Temperature: 80°C

[0153] (2) Liquid components with a boiling point lower than benzene (from methane to n-butane dissolved in liquid, and liquid components from 2-methyl-butane to benzene components):

[0154] Filling agent 25% polyethylene glycol 20M / carrier "Simalaite" 60-80 mesh,

[0155] Column: stainless ste...

Embodiment 2～4

[0165] Embodiment 2~4, comparative example 1~3, reference example 1,2

[0166] The reaction was carried out in the same manner as in Example 1, except that the supplied raw material composition and reaction conditions were changed as shown in Table 1. The test results are shown in Table 1 above.

[0167] Embodiment 1, comparative example 1 is to make reaction pressure be respectively 1.8MPa-G, 0.9MPa-G, adjust reaction temperature to make ethylbenzene conversion ratio substantially equal, except that, under the same conditions, make 15.8% by weight as lipid The result obtained by reacting the raw material of cyclohexane, a cyclic hydrocarbon. From these results, it can be seen that by increasing the reaction pressure from 0.9MPa-G to 1.8MPa-G, the loss of xylene can be reduced by about 20% by weight, the selectivity of benzene can be increased by 3.3% by mole, and the conversion rate of p-xylene can be increased by 0.1% by weight .

[0168]In Comparative Examples 2 and 3, t...

Embodiment 5

[0173] Continue reaction under the condition of embodiment 4, research reaction time and the relation of conversion rate of ethylbenzene. The results are shown in Figure 5 . The reduction rate of the conversion of ethylbenzene was 0.25% by weight per day.

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

PropertyMeasurementUnit
thicknessaaaaaaaaaa
Login to View More

Abstract

Disclosed is a process for converting ethylbenzene in a C8 aromatic hydrocarbon mixture containing a large amount of non-aromatic hydrocarbons, mainly to benzene, by which the xylene loss is small, the deactivation rate of the catalyst can be reduced, and a high conversion rate to p -xylene can be attained. The process for converting ethylbenzene comprises bringing a feedstock containing an alicyclic hydrocarbon(s) in an amount of not less than 1.0% by weight, ethylbenzene and xylene into contact with hydrogen in the presence of a catalyst to convert ethylbenzene mainly to benzene, wherein the catalyst is mainly composed of MFI zeolite and an inorganic oxide(s) and rhenium-supported, and wherein the conversion is carried out at a reaction pressure of not less than 1.0 MPa-G.

Description

technical field [0001] The invention relates to a conversion method of ethylbenzene and a production method of p-xylene. More specifically, it relates to a method for mainly converting ethylbenzene in a feed material containing at least 1.0% by weight or more of alicyclic hydrocarbons, ethylbenzene and xylene into benzene, which can reduce the loss of xylene and suppress catalytic activity degradation, and can achieve a higher conversion rate of p-xylene, and involves the product obtained from the conversion to distill and purify the C8 aromatic hydrocarbon mixture, and then separate the p-xylene method. Background technique [0002] Among the xylene isomers, the industrially most important raw material is p-xylene. Para-xylene is used as a monomer for polyester, which is the main polymer currently on par with nylon, and as a raw material for terephthalic acid. In recent years, para-xylene has been in high demand in Asia and other regions, and this trend is expected to cont...

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): C07C4/18B01J29/48C07C7/04C07C15/04C07C15/08C07B61/00
CPCC07C7/04C07C7/005C07C7/148C07C4/18B01J2229/42B01J2229/20C07C7/163B01J29/48C07C2521/04C07C2521/06C07C2529/78B01J37/0009Y02P20/52C07C15/04C07C15/08
Inventor 吉川贵浩渡边正敏市冈亮嗣
Owner TORAY IND INC