Recovery of styrene from pyrolysis gasoline by extractive distillation
Patent Information
- Authority / Receiving Office
- CN · China
- Current Assignee / Owner
- 苏尔寿际特(北京)技术有限公司
- Publication Date
- 2002-01-09
- Estimated Expiration
- Not applicable · inactive patent
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Abstract
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...