Method for preparing isophorone by plug flow rectification tray and liquid phase condensation of acetone

Abstract

The invention provides a plug-flow rectification tray and a method for preparing isophorone by liquid-phase condensation of acetone. The plug-flow rectification tray provided by the invention includes a tray and a plug-flow rectification tray arranged on the tray. Assemblies, the flat push flow assembly includes downcomer, graded overflow weir, light and heavy phase diversion element, liquid receiving plate I and flow guide element; the downcomer is connected with the tray, and the graded overflow weir is arranged on the inlet of the downcomer The light-heavy phase splitting element is located in the downcomer and below the grading overflow weir; the liquid receiving tray I is connected to the tray, and is located on the opposite side of the side where the downcomer and the tray are connected; the flow guide element is located at Above the connection between the liquid receiving tray I and the tray, the guide element is provided with a plurality of guide passages; the pressurized reaction rectification tower containing the plug flow rectification tray of the present invention is used to carry out the IP (isotropic) easily foaming The post-treatment of phorone) / alkali system can make the liquid phase distribute and flow more evenly, which in turn helps to improve the reaction effect.

Description

Technical field [0001] The invention relates to a reactive distillation tray and a process for preparing isophorone by using the reactive distillation tray. Background technique [0002] Isophorone is one of the important products of acetone deep processing, chemical name: 3,5,5-trimethyl-2-cyclohexen-1-one, English name: Isophorone (abbreviated as IP), molecular formula is C 9 H 14 O. Isophorone has a wide range of uses, with strong dissolving ability, good dispersibility, and good leveling. It is an excellent high boiling point green solvent. Because of its conjugated unsaturated ketone structure, it can be further reacted to obtain important products such as alcohols, acids, amines, esters and isocyanates, especially its downstream derivatives isophorone nitrile (IPN) and isophorone diamine (IPDA), isophorone diisocyanate (IPDI) and oxoisophorone (KIP) are of great significance in the fields of specialty amines, polyurethanes and nutritional chemicals. [0003] Industrially, i...

AI Technical Summary

Problems solved by technology

[0008] Although the current reactive distillation process overcomes some shortcomings of the traditional process, there are still many problems in the traditional reactive distillation reactor: such as large liquid holding capacity, uneven liquid phase flow, many side reactions, and low distillation efficiency , the pressure drop of the tray is large (the pressure drop of a single plate in conventional technology can exceed 2kPa), and the energy consumption is high.

Although it can suppress the problems caused by foaming to a certain extent, it also brings a series of problems such as the introduction of other components to pollute the reaction system, difficulty in wastewater treatment, waste of catalysts, and decomposition and loss of defoamers under harsh conditions.

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