Reactive rectification method and device for separating ethylene glycol, propylene glycol and butylene glycol

A reactive distillation tower, ethylene glycol technology, applied in chemical instruments and methods, separation/purification of hydroxyl compounds, preparation of organic compounds, etc., can solve the problem that propylene glycol and butanediol are not recycled, azeotroped or extracted The problems of high energy consumption and low separation energy consumption in rectification separation can achieve the effect of reducing energy consumption, less side reactions and better separation effect.
CN105541555AActive Publication Date: 2016-05-04TIANJIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TIANJIN UNIV
Publication Date
2016-05-04

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Abstract

The invention relates to a separation method and device for a mixture of ethylene glycol, propylene glycol and butylene glycol, and mainly aims to solve the problems that ethylene glycol, propylene glycol and butylene glycol are difficult to separate, the energy consumption is high and a high-purity glycol product is difficult to obtain at present. According to the method and device provided by the invention, by adoption of acetal or ketal reversible reaction, a glycol mixture reacts with a reactant namely aldehyde / ketone in a reaction rectification tower T11 to generate an acetal / ketone mixture S07 at first, and then separation is carried out sequentially by virtue of a rectification method to obtain unreacted aldehyde / ketone S12, a mixture S19 of an ethylene glycol acetal / ketone product and water, a mixture S26 of a propylene glycol acetal / ketone product and water, and a mixture S27 of a butylene glycol acetal / ketone product and water. The invention has the advantages that a method of reactive rectification is adopted to change a difficult problem of separating glycol mixtures with close boiling points to produce an azeotrope and having relatively small relative volatility into a problem of separating acetal / ketone products which are relatively easy to separate, and an effect of effectively separating the glycol mixtures is achieved.
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Description

technical field

[0001] The invention belongs to the field of chemical distillation and separation, and relates to a method for reactive distillation and separation of ethylene glycol, propylene glycol and butanediol. Background technique

[0002] As an important basic organic chemical raw material, ethylene glycol is mainly used in the production of polyester fibers, antifreeze, unsaturated polyester resins, lubricants, plasticizers, nonionic surfactants and explosives. In addition, ethylene glycol Alcohol can also be used in coatings, photographic developer, brake fluid, and ink industries, as a solvent and medium for ammonium perborate, and for the production of special solvents such as glycol ether, etc., with a wide range of uses. Moreover, studies have pointed out that ethylene glycol has great potential for development in the field of liquid fuel cells in the future.

[0003] At present, large-scale ethylene glycol production at home and abroad adopts direct hydration...

Claims

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