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Method for preparation of benzene, toluene and xylene from ethene cracking C9

A technology of ethylene cracking and xylene, which is applied in the direction of hydrocarbon cracking, hydrocarbon oil treatment, organic chemistry, etc., can solve the problems of high indene content, high unsaturated aromatics, complex aromatics composition, etc., and achieve the purpose of inhibiting dehydrogenation condensation reaction, Effects of reducing coke and carbon deposits and preventing hydrogenation loss

Active Publication Date: 2014-12-17
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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  • Method for preparation of benzene, toluene and xylene from ethene cracking C9
  • Method for preparation of benzene, toluene and xylene from ethene cracking C9
  • Method for preparation of benzene, toluene and xylene from ethene cracking C9

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1 Aromatic hydrocarbon extraction

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

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

[0016] Aromatic-rich solvent flows out from the bottom of the column. The raffinate is drained from the top of the column. Top discharge was set at 45 g / hr and bottom discharge was set at 655 g / hr. The raffinate aromatics content was 3.6%. Adjust...

Embodiment 2

[0017] Example 2. Extraction agent recovery

[0018] The extraction agent recovery column, the inner diameter of the column is 20mm, the packing used is 2x2 theta ring, the packing height is 1.4m, and it has an external heat 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 fractions at 135-220° C. are collected and discharged from the top of the column after condensation. The reflux ratio (return flow / outflow flow) was set to 10. The lean extractant obtained at the bottom of the column was cooled to 80°C in a downstream cooler and flowed into a buffer tank. The extraction agent 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 + Aromatic content is ≧ 99.2% by weight.

Embodiment 3

[0020] Example 3 Preparation of Pre-hydrogenation Catalyst for Extracting Aromatic Hydrocarbons

[0021] Take 60.0 grams of Na-type MCM-56 zeolite and 25.716 grams of γ-Al 2 O 3 Mixing, adding 40 ml of water, kneading, extruding, drying at 120°C for 12 hours, and calcining at 540°C for 6 hours in air to obtain a carrier. Then, using 100% water vapor, at 550° C., 5 g per gram of catalyst per hour per gram of water passed through the carrier and passivated for 5 hours to obtain a passivated catalyst carrier. Use 3.73 g of analytically pure nickel nitrate, 0.917 g of analytically pure chromium nitrate, 0.387 g of analytical magnesium nitrate and 35 ml of deionized water to form an impregnation solution, impregnate the above-mentioned carrier in equal volume at room temperature for 24 hours, and dry at 120 ° C Catalyst A was obtained after calcination at 500°C for 6 hours in air for 12 hours. Use 6.21 g of analytically pure nickel nitrate, 1.38 g of analytically pure chromium n...

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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 a kind of ethylene cracking C 9 The method for the preparation of benzene, toluene and xylene. Background technique [0002] Heavy aromatic hydrocarbons are generally C 9 and C 10 main C 9 + Aromatics mainly come from heavy aromatics produced by catalytic reforming of naphtha and by-products of petroleum cracking to ethylene. 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 heavierization of cracked raw materials, the amount of cracked heavy fractions produced by ethylene also tends to increase. Ethylene cracking C 9 It is rich in aromatic groups and contains about 60% of aromatic hydrocarbons. This part of aromatic hydrocarbons has a complex composition, high indene content, low trimethylbenzene content, high unsaturated aromatic hydrocarbons, and high colloids, so ethylene cracks C ...

Claims

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Application Information

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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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