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Production process for separating ethylbenzene and ortho-xylene from mixed xylene

A technology for mixing xylene and production process, which is applied in the purification/separation of hydrocarbons, hydrocarbons, chemical instruments and methods, etc., can solve the problems of large catalyzing dose, large equipment investment, high energy consumption, and achieves moderate separation conditions, The effect of good air flux and lower energy consumption

Inactive Publication Date: 2005-01-19
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses a large amount of urging, a lot of loss, high energy consumption, and relatively large equipment investment.

Method used

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  • Production process for separating ethylbenzene and ortho-xylene from mixed xylene
  • Production process for separating ethylbenzene and ortho-xylene from mixed xylene
  • Production process for separating ethylbenzene and ortho-xylene from mixed xylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add xylene raw material D and 2% volume ratio catalyst H in mixer 1, stir evenly at normal temperature, and dissolve each other; After mixing, enter o-xylene separation tower 2 equipped with stainless steel wire corrugated packing at 7L / h, tower The temperature of the kettle is 149°C, the pressure of the tower kettle is ≤0.02Mpa, and the reflux ratio at the top of the tower is 15.3. The ortho-xylene product E is separated from the tower kettle, and part E is reboiled by the tower kettle reboiler 6, and returns to the o-xylene separation tower 2 , the tower overhead steam A contains catalyst, ethylbenzene, p-xylene, m-xylene; the tower overhead steam A enters the tower top reflux intermediate tank 4 after being cooled by the cooler 3, and a part of it is injected into the tower top reflux intermediate tank 4 through the pump 5 as reflux Part of the top of the o-xylene separation tower 2 is used as distillate A; distillate A enters the ethylbenzene separation tower 7 at 4L...

Embodiment 4

[0027]Add xylene raw material D and 4% volume ratio catalyst H in mixer 1, stir evenly at normal temperature, and dissolve each other; After mixing, enter o-xylene separation tower 2 equipped with stainless steel wire corrugated packing at 6L / h, tower The temperature of the kettle is 140°C, the pressure of the tower kettle is ≤0.02Mpa, and the top reflux ratio is 16. The ortho-xylene product E is separated from the tower kettle. The output steam A contains catalyst, ethylbenzene, p-xylene, and m-xylene; the steam A distilled from the tower top is cooled by the cooler 3 and enters the top reflux intermediate tank 4, and a part of it is pumped into the o-xylene as reflux through the pump 5. The top of the xylene separation tower 2, a part is used as distillate A; distillate A enters the catalyst recovery tower 12, the temperature of the tower bottom is controlled at 130 ° C, the pressure of the tower bottom is ≤ 0.01Mpa, the top reflux ratio is 8, and the tower bottom is separate...

Embodiment 5

[0029] The steps and the volume ratio of the catalyst are the same as in Example 4, and its rectification conditions: feed rate 15L / h, 160°C of tower bottom temperature of o-xylene separation tower 2, tower bottom pressure≤0.02Mpa, top reflux ratio of 16 ; The temperature of the tower bottom of the catalyst recovery tower 12 is 160° C., the pressure of the tower bottom is ≤0.01Mpa, and the reflux ratio at the top of the tower is 8.

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PUM

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Abstract

The invention provides a production process for separating ethylbenzene and ortho-xylene from mixed xylene which comprises, charging promoting agent into xylol raw materials, feeding into ortho-dimethylbenzene knockout tower, the tower still separating ortho-dimethylbenzene product, then feeding into ethylbenzene knockout tower filled with corrugated filling, the tower still separating mixture of p-dimethylbenzene and metaxylene, the overhead entering the promoter reclamation tower again, the tower still separating ethylbenzene containing no promoting agent, and the tower top separating recovered promoting agent containing no ethylbenzene, and pumping the reclaimed promoting agent into xylol raw material for recirculation.

Description

technical field [0001] The invention relates to a separation production process of an organic mixture, in particular to a production process for separating o-xylene and ethylbenzene from mixed xylenes. Background technique [0002] In mixed xylene, the boiling points of the components are very close, among which the component of o-xylene has the highest boiling point, and the component of ethylbenzene has the lowest boiling point. The existing catalytic distillation method separates o-xylene from mixed xylene. For toluene and ethylbenzene, a catalyst having a lower boiling point than any component in the mixture is used. The catalyst includes tert-butanol, carbon tetrachloride, ethanol, and the like. The accelerated distillation method separates mixed xylenes. First, o-xylene is separated, followed by ethylbenzene, and finally p-xylene and m-xylene are separated. This method is disclosed in Chinese patent ZL94101274.3. This method is to continuously add a substance called a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/00C07C15/073C07C15/08
Inventor 黄坤荣黄钟奇林勋宇万烈雄贺产鸿李小明欧阳钢锋杨洋溢
Owner CHINA PETROLEUM & CHEM CORP
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