Process method for producing xylene from C<9><+> heavy aromatic hydrocarbons

A technology for heavy aromatic hydrocarbons and process methods, which is applied in the production of bulk chemicals, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. requirements and other issues, to achieve the effect of low cost of raw materials

Active Publication Date: 2020-01-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that in the prior art, only heavy aromatics are lightened, resulting in the waste of side chain methyl groups or the need for fresh benzene or toluene in raw materials to participate in the defects of strict raw material composition requirements, and to provide a new C 9 + Process for producing xylenes from heavy aromatics, which has the advantage of using only C 9 + The advantages of producing BTX with heavy aromatics as the raw material of aromatics, and the advantages of flexible and adjustable target product types among benzene, toluene and xylene

Method used

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  • Process method for producing xylene from C&lt;9&gt;&lt;+&gt; heavy aromatic hydrocarbons
  • Process method for producing xylene from C&lt;9&gt;&lt;+&gt; heavy aromatic hydrocarbons
  • Process method for producing xylene from C&lt;9&gt;&lt;+&gt; heavy aromatic hydrocarbons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Vector preparation

[0061] Na 2 O less than 0.05% (weight), SiO 2 / Al 2 o 3 66.7 grams of ammonium ZSM-5 zeolite with a molecular ratio of 80 and Na 2 γ-Al with O less than 0.05% by weight 2 o 3 ·H 2 O 57.1 grams are evenly mixed, then add 7 grams of nitric acid aqueous solution with a concentration of 65-68wt%, 2 grams of scallop powder and 60-70 grams of water, knead evenly, extrude, dry at 120 ° C for 4 hours, and roast at 550 ° C in an air atmosphere After 3 hours, pelletize to obtain a cylindrical carrier with a length of 2 mm and a diameter of 1.5 mm.

[0062] Catalyst preparation

[0063] Get 50 grams of carrier, with 35 milliliters of ammonium molybdate aqueous solution (equivalent to containing MoO 3 1.6 g) was impregnated with the support, dried at 120°C for 4 hours, and calcined at 550°C for 3 hours to obtain MoO 3 Catalyst in an amount of 3.1w%.

[0064] Catalyst evaluation

[0065] use figure 1 In the process flow shown, the hydrodealkylation ...

Embodiment 2

[0075] Vector preparation

[0076] Na 2 O less than 0.05% (weight), SiO 2 / Al 2 o 3 66.7 grams of ammonium ZSM-5 zeolite with a molecular ratio of 80 and Na 2 γ-Al with O less than 0.05% by weight 2 o 3 ·H 2 O 57.1 grams are evenly mixed, then add 7 grams of nitric acid aqueous solution with a concentration of 65-68wt%, 2 grams of scallop powder and 60-70 grams of water, knead evenly, extrude, dry at 120 ° C for 4 hours, and roast at 550 ° C in an air atmosphere After 3 hours, pelletize to obtain a cylindrical carrier with a length of 2 mm and a diameter of 1.5 mm.

[0077] Catalyst preparation

[0078] Get 50 grams of carrier, with 35 milliliters of ammonium molybdate aqueous solution (equivalent to containing MoO 3 1.6 g) was impregnated with the support, dried at 120°C for 4 hours, and calcined at 550°C for 3 hours to obtain MoO 3 Catalyst in an amount of 3.1w%.

[0079] Catalyst evaluation

[0080] use figure 1 In the process flow shown, the hydrodealkylatio...

Embodiment 3

[0090] Vector preparation

[0091] Na 2 O less than 0.05% (weight), SiO 2 / Al 2 o 3 66.7 grams of ammonium Beta zeolite with a molecular ratio of 25 and Na 2 γ-Al with O less than 0.05% by weight 2 o 3 ·H 2 O 57.1 grams are evenly mixed, then add 7 grams of nitric acid aqueous solution with a concentration of 65-68wt%, 2 grams of scallop powder and 60-70 grams of water, knead evenly, extrude, dry at 120 ° C for 4 hours, and roast at 550 ° C in an air atmosphere After 3 hours, pelletize to obtain a cylindrical carrier with a length of 2 mm and a diameter of 1.5 mm.

[0092] Catalyst preparation

[0093] Take 50 grams of carrier, impregnate the carrier with 35 milliliters of nickel nitrate aqueous solution (equivalent to 1.3 grams of NiO), dry at 120°C for 4 hours, and roast at 550°C for 3 hours to prepare a catalyst with a NiO content of 2.5w%.

[0094] Catalyst evaluation

[0095] use figure 1 In the process flow shown, the hydrodealkylation and transalkylation rea...

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Abstract

The invention discloses a process method for producing xylene from C<9><+> heavy aromatic hydrocarbons. The process method comprises the following steps: low-boiling-point heavy aromatic hydrocarbonsand high-boiling-point heavy aromatic hydrocarbons are separated from the C<9><+> heavy aromatic hydrocarbons in a heavy aromatic hydrocarbon separation tower; in the presence of hydrogen, the low-boiling-point heavy aromatic hydrocarbons is allowed to be in contact with a hydrodealkylation and transalkylation catalyst to be subjected to a reaction in a hydrodealkylation and transalkylation reaction unit to obtain a material stream containing benzene, toluene and xylene aromatic hydrocarbons, non-aromatic hydrocarbons, unreacted heavy aromatic hydrocarbons and hydrogen; and the material streamcontaining benzene, toluene and xylene aromatic hydrocarbons, non-aromatic hydrocarbons, unreacted heavy aromatic hydrocarbons and hydrogen sequentially passes through a gas-liquid separator, a stripping tower, a benzene separation tower, a toluene separation tower, and a xylene separation tower to sequentially separate hydrogen, the non-aromatic hydrocarbons, benzene, toluene and xylene aromatichydrocarbon products, and the unreacted heavy aromatic hydrocarbons.

Description

technical field [0001] The present invention relates to C 9 + A process for producing xylene from heavy aromatics. Background technique [0002] Benzene, toluene, xylene and C can be obtained during naphtha reforming and cracking 9 + Heavy aromatics. In recent years, due to the development of plastics, synthetic fibers and synthetic rubber industries, the demand for p-benzene and xylene has grown rapidly, and their market prices are much higher than other aromatics. In terms of price, usually two Toluene>Benzene>Toluene>C 9 + heavy aromatics. Using low-value aromatics to increase the production of higher-value aromatics is an effective means to make full use of aromatics resources. So far, many countries have used toluene and C 9 + A lot of research work has been done on the production of xylene from heavy aromatics, and some achievements have been made. [0003] Catalytic reforming units in refineries by-produce a large amount of C 9 + Heavy aromatics. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C4/18C07C15/08B01J23/28B01J23/755B01J23/30
CPCC07C4/18B01J23/28B01J23/755B01J23/30C07C15/08Y02P20/52
Inventor 李华英李经球杨德琴孔德金
Owner CHINA PETROLEUM & CHEM CORP
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