an ethylene cracker c 9 Process for preparing benzene, toluene, xylene

A technology for ethylene cracking and xylene, which is used in hydrocarbon cracking to produce hydrocarbons, petroleum industry, hydrotreating processes, etc., can solve the problems of high indene content, high unsaturated aromatic hydrocarbons, complex aromatic hydrocarbon composition, etc., and achieves inhibition of dehydrogenation condensation reaction. , Reduce the effect of coke and carbon deposition, and prevent the loss of hydrogenation

Active Publication Date: 2017-03-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ethylene cracking C 9 It is rich in aromatic groups, containing about 60% aromatics. This part of aromatics is complex, with high indene content, low trimethylbenzene content, high unsaturated aromatics, and high colloid content, so ethylene cracking C 9 + Aromatics and Catalytic Reforming C 9 + Compared with aromatics, it is difficult to process and utilize, and it is difficult to directly separate and utilize. Most domestic ethylene plants crack C 9 Sold as fuel oil or after primary processing to produce resins and solvent oils

Method used

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  • an ethylene cracker c <sub>9</sub> Process for preparing benzene, toluene, xylene
  • an ethylene cracker c <sub>9</sub> Process for preparing benzene, toluene, xylene
  • an ethylene cracker c <sub>9</sub> Process for preparing benzene, toluene, xylene

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1 aromatics extraction

[0014] Ethylene cracking C 9 Raw material density 0.95g / ml; distillation range 110-220°C; aromatics content 53%;

[0015] The inner diameter of the column is 20mm, the filler used is 2x2 θ ring, the height of the filler is 2.2m, and there are three tower sections in total, with an external heating insulation jacket, and the insulation temperature is 65°C. The extraction agent is tetraethylene glycol (water content 4wt%): the feeding position is the upper half of the tower, and the flow rate is 600 g / h. Feed temperature ~ 60°C; ethylene cracking C 9 + The raw material flow rate is 100 g / hour, the feed temperature is 60°C, and the feed position is the lower half of the extraction column.

[0016] Aromatic-rich solvent flows from the bottom of the column. The raffinate oil is discharged from the top of the column. The discharge at the top of the column was set at 45 grams / hour, and the discharge at the bottom of the column was set ...

Embodiment 2

[0017] Embodiment 2. extractant reclaims

[0018] Extraction agent recovery column, the inner diameter of the column is 20mm, the filler used is 2x2 θ ring, the height of the filler is 1.4m, and it has an external heating insulation jacket. In this column, aromatics are removed from the extractant. The aromatic-rich solvent is fed from the middle of the column, and the fraction at 135-220°C is collected, condensed and discharged from the top of the column. The reflux ratio (backflow / outflow) was set to 10. The lean extractant obtained at the bottom of the column is cooled to 80°C in a downstream cooler and flows into a buffer tank. The extractant is injected into the extraction column from the buffer tank by the metering pump and recycled.

[0019] Through the above process, the isolated C 9 + The aromatic content is ≧99.2% (weight).

Embodiment 3

[0020] Example 3 Preparation of Extracted Aromatics Prehydrogenation Catalyst

[0021] Take 60.0 grams of Na-type MCM-56 zeolite and 25.716 grams of γ-Al 2 o 3 Mix, add 40 ml of water, knead, extrude, dry at 120°C for 12 hours, and bake at 540°C in air for 6 hours to obtain a carrier. Then adopt 100% water vapor, at 550 DEG C, 5g per gram of catalyst per hour in terms of water passes through the carrier, and passivate for 5 hours to obtain a passivated catalyst carrier. Use 3.73 grams of analytically pure nickel nitrate, 0.917 grams of analytically pure chromium nitrate, 0.387 grams of analytical magnesium nitrate and 35 milliliters of deionized water to make an impregnation solution, impregnate the above carrier in equal volume at room temperature for 24 hours, and dry at 120 ° C Catalyst A was obtained after calcination at 500° C. in air for 6 hours for 12 hours. Use 6.21 grams of analytically pure nickel nitrate, 1.38 grams of analytically pure chromium nitrate, 0.978 gr...

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Abstract

The invention relates to a method for preparation of benzene, toluene and xylene from ethene cracking C9; an ethene cracking C9 raw material is extracted for separation of aromatic fractions and other non aromatic components, separation of aromatics can be performed in an extraction column, the separation temperature is 50 to 70 DEG C, the feeding weight ratio of an extracting agent to the ethene cracking C9 raw material is 4-10:1, the extracting agent is tetraglycol; the distillation range of aromatics extraction is controlled in the range of 135 to 220 DEG C; unsaturated aromatics are pre hydrogenated for hydrogenation saturation, pre hydrogenated C9 + aromatics is processed for lightening of heavyweight aromatics by catalytic hydrodealkylation method for preparation of the benzene, the toluene and the xylene; according to the method, the conversion rate of X (C9+) aromatics is 61.6 to 62.2; Y (BTX) (benzene, toluene and xylene) yield is 40.8-42.8; and S (BTX) selectivity is 67.96-8.8.

Description

technical field [0001] The invention relates to an ethylene cracking C 9 Process for the preparation of benzene, toluene, xylene. Background technique [0002] Heavy aromatics are generally represented by C 9 and C 10 Main C 9 + Aromatics mainly come from aromatics produced by catalytic reforming of naphtha and heavy aromatics produced by-products of petroleum cracking ethylene units. Ethylene cracking C 9 Distillate production is about 10% to 15% of ethylene production capacity. Due to the increase in ethylene production capacity and the trend of diversification and heavy cracking raw materials, the number of heavy distillates cracked by ethylene by-product is still on the rise. Ethylene cracking C 9 It is rich in aromatic groups, containing about 60% aromatics. This part of aromatics is complex, with high indene content, low trimethylbenzene content, high unsaturated aromatics, and high colloid content, so ethylene cracking C 9 + Aromatics and Catalytic Reforming...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/04C07C15/06C07C15/08C07C4/06C10G69/00
Inventor 刘键杜建卫原雯郭新军张力徐亚荣李亚萍贺春梅
Owner PETROCHINA CO LTD
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