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Recovery of styrene from pyrolysis gasoline by extractive distillation

A technology of styrene and distillation column, applied in azeotropic/extractive distillation, distillation separation, extraction purification/separation, etc., can solve problems such as difficult component separation

Inactive Publication Date: 2002-01-09
苏尔寿际特(北京)技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to separate the components of this mixture by ordinary fractional distillation

Method used

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  • Recovery of styrene from pyrolysis gasoline by extractive distillation
  • Recovery of styrene from pyrolysis gasoline by extractive distillation
  • Recovery of styrene from pyrolysis gasoline by extractive distillation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment I

[0036] This example illustrates the application of various solvents in the extractive distillation of pyrolysis gasoline feedstock.

[0037] Containing 35.3% toluene, 4.3% vinyl norbornene, 11.8% ethylbenzene, 3.3% p-xylene, 0.2% 2,5-diethylthiophene, 5.5% o-xylene, 0.5% dicyclopentadiene , 27.9% styrene, 0.1% styrene propylene, and 0.3% 6,6-dimethylfulvene (by weight) were added to a pyrolysis gasoline feedstock at various solvent:feed ratios with an extraction solvent. The whole mixture (including the extraction solvent) is heated under reflux conditions for 20-60 minutes in a gas-liquid equilibrium still with one theoretical stage and equipped with a total reflux condenser. Samples of the pyrolysis gasoline feedstock and equilibrium vapor were taken prior to solvent addition. Solvent was fed to the still pot at solvent:feed ratios of 1:1 and 5:1. After equilibrium is reached, a small sample of the condensed vapor is taken using the septum located in the lower part of the ...

Embodiment II

[0045] This embodiment illustrates that sulfolane is used as an extractant to carry out extractive distillation of the raw material mixture described in Example 1. The distillation apparatus was the same as described in Example 1. For this experiment, 75 g of pyrolysis gasoline feedstock was added to a vapor-liquid equilibrium still, and feedstock and vapor samples were taken for analysis. Solvent was fed to the kettle at solvent:feed ratios of 1:1 (75 grams added) and 5:1 (375 grams added). After equilibrium is reached, a small sample of the condensed vapor is taken using the septum located in the lower part of the total reflux condenser. The sample was analyzed by gas chromatography and the weight fraction of the feedstock components in the gas phase was determined. The test results are summarized in Table II.

[0046] Table II Component A / B Relative Volatility A / B Relative Volatility A / B Relative Volatility Description No solvent 1:1 solvent 1 ...

Embodiment III

[0050] This example illustrates the use of 2-pyrrolidinedione as an extractant for extractive distillation of the raw material mixture described in Example I. The distillation apparatus was the same as described in Example 1. For this experiment, 75 g of pyrolysis gasoline feedstock was added to a vapor-liquid equilibrium still, and feedstock and vapor samples were taken for analysis. Solvent was fed to the kettle at solvent:feed ratios of 1:1 (75 grams added) and 5:1 (375 grams added). After equilibrium is reached, a small sample of the condensed vapor is taken using the septum located in the lower part of the total reflux condenser. The sample was analyzed by gas chromatography and the weight fraction of the feedstock components in the gas phase was determined. The test results are summarized in Table III.

[0051] Table III Component A / B Relative Volatility A / B Relative Volatility A / B Relative Volatility Description No solvent 1:1 solvent 1 : ...

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Abstract

An extractive distillation process for separating at least one substituted unsaturated aromatic from a pyrolysis gasoline mixture, containing said aromatic and at least one close-boiling aromatic or non-aromatic hydrocarbon, employing a two part extractive solvent: (a) sulfolane (tetramethylene sulfone), and (b) portion consisting of water.

Description

Background of the invention [0001] In one aspect, the invention relates to the separation of selected compounds in a pyrolysis gasoline stream primarily containing substituted unsaturated aromatics. Extractive distillation is used to separate selected compounds from aromatic and non-aromatic hydrocarbons with similar boiling points. In another aspect, the present invention relates to the use of mixtures of sulfolane (tetrahydrothiol sulfone) alone or with water as solvent (also called extractant or entrainer) in the aforementioned extractive distillation. [0002] Extractive distillation is a well-known technique for separating mixture components with relative volatilities close to 1 (i.e., almost equal in volatility and boiling point). It is difficult to separate the components of this mixture by ordinary fractional distillation. In extractive distillation, a solvent is fed into the distillation column above the feed point of the separated feed mixture. The solvent present...

Claims

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Application Information

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IPC IPC(8): C07C5/367B01D3/32C07C7/00C07C7/08C07C7/10C07C15/40C07C15/46C10G7/08
CPCB01D3/322C07C7/10C07C7/005C07C15/46C07C7/08C10G7/08C07C15/00C07C5/367C07C7/00C07C15/40
Inventor 李福民J·C·金特赖R·W·韦特彻莱
Owner 苏尔寿际特(北京)技术有限公司
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