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A method for increasing production of xylene by transalkylation of aromatic hydrocarbons and cracking of non-aromatic hydrocarbons

A technology of aromatic hydrocarbon alkyl and non-aromatic hydrocarbon, applied in the direction of hydrocarbon cracking, chemical equipment and method, bulk chemical production, etc., can solve the problem of high energy consumption of the device, and achieve the effect of reducing energy consumption

Active Publication Date: 2019-01-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the existing transalkylation technology that cannot directly process the raw materials containing high non-aromatic hydrocarbons, and requires separation and pretreatment such as extraction to remove non-aromatic hydrocarbons, resulting in high energy consumption of the device.

Method used

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  • A method for increasing production of xylene by transalkylation of aromatic hydrocarbons and cracking of non-aromatic hydrocarbons
  • A method for increasing production of xylene by transalkylation of aromatic hydrocarbons and cracking of non-aromatic hydrocarbons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Na 2 O content less than 0.1% (weight), SiO 2 / Al 2 o 3 66.7 grams of ZSM-5 molecular sieve with a molecular ratio of 50 and Na 2 γ-Al with O content less than 0.1% by weight 2 o 3 ·H 2 O57.1 g was evenly mixed, then added a certain amount of dilute nitric acid and Tianqing powder, kneaded evenly, extruded, dried at 120°C for 4 hours, and roasted at 500°C for 3 hours to obtain catalyst A1

[0014] SiO 2 / Al 2 o 3 Beta zeolite 60.0 g with a molecular ratio of 50 and Na 2 γ-Al with O content less than 0.1% by weight 2 o 3 ·H 2 O57.1 g is evenly mixed, then a certain amount of dilute nitric acid and Tianqing powder are added and kneaded evenly, extruded into strips, roasted to make a carrier, and placed in an impregnation container after pelletizing. A certain amount of ammonium perrhenate was dissolved in water, impregnated on the surface of the carrier, dried at 120°C for 4 hours, and calcined at 500°C for 3 hours to obtain catalyst B1.

[0015] In the fixe...

Embodiment 2

[0017] Na 2 O content less than 0.1% (weight), SiO 2 / Al 2 o 3 66.7 grams of Beta molecular sieve with a molecular ratio of 50 and Na 2 γ-Al with O content less than 0.1% by weight 2 o 3 ·H 2 O57.1 g was uniformly mixed, then added a certain amount of dilute nitric acid and Tianqing powder, kneaded evenly, extruded, roasted to make a carrier, dried at 120 ° C for 4 hours, and roasted at 500 ° C for 3 hours to obtain catalyst A2.

[0018] Na 2 O content less than 0.1% (weight), SiO 2 / Al 2 o 3 66.7 grams of ZSM-12 molecular sieve with a molecular ratio of 60 and Na 2 γ-Al with O content less than 0.1% by weight 2 o 3 ·H 2 O57.1 g was uniformly mixed, then added a certain amount of dilute nitric acid and ammonium molybdate aqueous solution, kneaded evenly, extruded, and roasted at 550°C to make the second layer of catalyst B2.

[0019] In the fixed-bed reactor, install 10 grams of catalyst A2 in the upper bed, and 10 grams of catalyst B2 in the lower bed, pass in h...

Embodiment 3

[0021] Na 2 O content less than 0.1% (weight), SiO 2 / Al 2 o 3 66.7 grams of Mor molecular sieve with a molecular ratio of 40 and Na 2γ-Al with O content less than 0.1% by weight 2 o 3 ·H 2 O57.1 g is evenly mixed, then a certain amount of dilute nitric acid and Tianqing powder are added and kneaded evenly, extruded into strips, roasted to make a carrier, and placed in an impregnation container after pelletizing. A certain amount of ammonium molybdate was dissolved in an appropriate amount of water, impregnated on the surface of the carrier, dried at 120°C for 4 hours, and calcined at 500°C for 3 hours to prepare the first layer of catalyst A3.

[0022] Na 2 O content less than 0.1% (weight), SiO 2 / Al 2 o 3 46 grams of Mor molecular sieve with a molecular ratio of 80, Na 2 O content less than 0.1% (weight), SiO 2 / Al 2 o 3 20.7 grams of Beta molecular sieve with a molecular ratio of 60, Na 2 γ-Al with O content less than 0.1% by weight 2 o 3 ·H 2 057.1 grams...

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Abstract

The invention relates to a method for increasing a yield of xylene by transalkylation of aromatic hydrocarbon and cracking of non-aromatic hydrocarbon. The method mainly solves the problem of incapability of effectively treating a raw material containing non-aromatic hydrocarbon in a conventional transalkylation technology. A technical scheme of the invention adopts the method for increasing the yield of xylene by transalkylation of aromatic hydrocarbon and cracking of non-aromatic hydrocarbon, and the method comprises the following steps: with toluene, heavy aromatic hydrocarbon with C9 and more, and non-aromatic hydrocarbon with C6 and more as raw materials, allowing the raw materials to pass through a catalyst bed layer under the condition of critical hydrogen so as to generate an effluent rich in xylene, wherein a weight ratio of toluene to heavy aromatic hydrocarbon with C9 and more is 0.01 to 4; the content of non-aromatic hydrocarbon in the raw materials by weight percentage is 0.5 to 20%; reaction temperature is 200 to 500 DEG C; pressure is 0.5 to 5.0 MPa; weight hourly space velocity in terms of liquid raw materials is 1.0 to 5.0 h<-1>; and a hydrogen-hydrocarbon molecular ratio is 1.0 to 10. Thus, the above-mentioned technical problem is well solved, and the method can be applied in industrial production for increasing the yield of xylene by transalkylation of aromatic hydrocarbon.

Description

technical field [0001] The invention relates to a method for increasing the production of xylene through transalkylation of aromatic hydrocarbons and cracking of non-aromatic hydrocarbons. Background technique [0002] P-xylene is one of the main basic organic raw materials in the petrochemical industry. It is widely used in many chemical production fields such as chemical fibers, synthetic resins, pesticides, medicines, and plastics. A typical paraxylene (PX) production unit usually includes six units including catalytic reforming of naphtha, xylene fractionation, aromatics extraction, toluene disproportionation and transalkylation, adsorption separation, and isomerization. The extraction of aromatics requires a complex solvent extraction device, and the extraction solvent needs to be continuously replenished during the extraction operation. The cost of the extraction process accounts for a large proportion of the cost of aromatics. In addition, in traditional aromatics co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C6/12C07C4/06C07C15/08C07C15/04
CPCY02P20/52
Inventor 李经球郭宏利杨德琴孔德金
Owner CHINA PETROLEUM & CHEM CORP
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