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Plug flow distillation tray and method for preparing IP (isophorone) through liquid-phase condensation of acetone

A technology of plug flow and rectification tower, which is applied in the preparation of carbon-based compounds, preparation of organic compounds, chemical instruments and methods, etc. It can solve the problems of large tray pressure drop, catalyst waste, and large liquid holdup

Active Publication Date: 2019-07-23
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Plug flow distillation tray and method for preparing IP (isophorone) through liquid-phase condensation of acetone
  • Plug flow distillation tray and method for preparing IP (isophorone) through liquid-phase condensation of acetone
  • Plug flow distillation tray and method for preparing IP (isophorone) through liquid-phase condensation of acetone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0133] In this embodiment, the structural diagram of the plug-flow rectification tray can be found in Figure 8 , 6a , 6b.

[0134] The plug-flow rectification tray 1 includes a tray 3 and a plug-flow assembly 48 arranged on the tray 3. The plug-flow assembly 48 includes a graded overflow weir 9, a downcomer plate 16, a light-heavy phase flow splitting element 13, a receiving Liquid pan I6 and flow guiding element 20. The plug-flow rectification tray of the present embodiment is a single overflow, that is, in the rectification tower, a downcomer 5 and a liquid-receiving tray are respectively installed on the trays of each layer of plug-flow rectification trays installed at intervals up and down. Disk I6, that is, a group of plug flow assemblies 48 are installed. The downcomers 5 of the plug flow components 48 of the upper and lower plug flow rectification trays are arranged in a staggered manner, so the liquid receiving pans I6 and 7 in the upper and lower layers are also a...

Embodiment 2

[0138] This embodiment is basically the same as Embodiment 1, except that the spray hood used in the plug flow rectification tray is a strip-shaped spray hood with a rectangular cross section (or called a rectangular spray hood):

[0139] as attached image 3 and 4 As shown, the strip-shaped spray cover 27 is arranged on the tray 3, and the same structural parts of the strip-shaped spray cover 27 and the cylindrical spray cover 17 of Embodiment 1 will not be repeated here one by one, and can refer to Embodiment 1, below The main difference is explained as follows: the cross-section of the gas riser 19 is a rectangle, and the length and width are 240mm and 20mm respectively. 160mm. The spray cover 27 has a total height of 200mm, and the spray cover 27 is set on the air riser 19, and the overall cross-sectional shape of the spray cover 27 is also rectangular. The spray cover 27 is provided with a necking structure 24 sunken toward the inside of the spray cover at the upper li...

Embodiment 3

[0142] The schematic diagram of the process for preparing isophorone (or IP for short) by liquid phase condensation of acetone is attached Figure 5 As shown, the acetone and NaOH aqueous solution enter the first condensation reactor 30 after being preheated by the preheater 28 and fully mixed by the mixer 29 (this embodiment specifically adopts the SMV type static mixer of Sulzer, Switzerland) (the present embodiment The reactor 30 used is a tubular fixed-bed reactor), the reaction temperature is 210°C, the pressure is 3.5MPa(G), the acetone processing capacity is 600kg / h, the mass ratio of acetone and water is 5:1, and the catalyst is NaOH. The total flow rate of the liquid was taken as the benchmark, and the NaOH mass concentration was 0.1%.

[0143] The acetone conversion rate corresponding to the outlet of the first condensation reactor 30 is 10%, and the reaction liquid (ie, the liquid phase stream) then enters the pressurized reactive distillation tower 31, and the pres...

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Abstract

The invention provides a plug flow distillation tray and a method for preparing IP (isophorone) through liquid-phase condensation of acetone. The plug flow distillation tray comprises a tray and a plug flow assembly arranged on the tray, wherein the plug flow assembly comprises a downcomer, a grading overflow weir, a light and heavy phase distributing element, a liquid receiving plate I and a flowguide element; the downcomer is connected with the tray, and the grading overflow weir is arranged at an inlet of the downcomer; the light and heavy phase distributing element is arranged in the downcomer and located below the grading overflow weir; the liquid receiving plate I is connected with the tray and located on the side opposite to the side where the downcomer and the tray are connected;the flow guide element is arranged above the connection position of the liquid receiving plate I and the tray and is provided with multiple flow guide channels. A pressurized reaction distillation tower containing the plug flow distillation tray is applied to perform aftertreatment on an easily foaming IP / alkaline solution system, so that a liquid phase is more uniformly distributed and flow, andthe reaction effect is favorably improved.

Description

technical field [0001] The invention relates to a reaction rectification tray and a process for preparing isophorone by utilizing the reaction rectification 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, it has strong dissolving ability, good dispersion and good leveling, and is an excellent green solvent with high boiling point. Because of its structure of conjugated unsaturated ketone, 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 oxyisophorone (KIP), which are of great importance in the field of specialty amines, polyurethanes and nutraceuticals. [0...

Claims

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Application Information

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IPC IPC(8): B01D3/14C07C49/603C07C45/74C07C45/82
CPCB01D3/14C07C45/74C07C45/82C07C2601/16C07C49/603Y02P20/10
Inventor 何岩黎源田博边路路周锐员玫李金明孙媛媛
Owner WANHUA CHEM GRP CO LTD
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