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Device and method for synthesizing trioxymethylene by salt effect reactive rectification

A technology of paraformaldehyde and reactive distillation, which is applied in separation methods, chemical instruments and methods, fractionation, etc., can solve the problems of unrelevant reporting, etc., and achieve the effects of reducing energy consumption, reducing the number of trays, and reducing investment

Pending Publication Date: 2021-01-19
鄂尔多斯应用技术学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are still few studies on the influence of salt effect on the synthesis process of paraformaldehyde, and there are no relevant reports and industrialization cases

Method used

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  • Device and method for synthesizing trioxymethylene by salt effect reactive rectification
  • Device and method for synthesizing trioxymethylene by salt effect reactive rectification
  • Device and method for synthesizing trioxymethylene by salt effect reactive rectification

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1: as figure 2Shown, a kind of device of salt effect reactive distillation synthesis paraformaldehyde, it comprises reactive distillation tower 1, extraction tower 2, concentration tower 3 and recovery tower 4, the middle part of reactive distillation tower 1 is provided with feed inlet, The middle material outlet of the reactive distillation tower 1 is connected to the inlet of the pump III 11, the top material outlet of the reactive distillation tower 1 is connected to the material inlet of the condenser I5, and the material outlet of the condenser I5 is connected to the inlet of the reflux tank I6 Connect, the outlet of reflux tank I 6 is connected with the inlet of pump II 7, and the outlet of pump II 7 is connected with the top reflux port of reactive distillation tower 1 and the material inlet of extraction tower 2 respectively; The top material outlet of extraction tower 2 is connected with the recovery The material inlet of tower 4 is connected, and ...

Embodiment 2

[0035] Embodiment 2: a kind of device of reactive distillation synthesis paraformaldehyde, its difference with embodiment 1 is that there is no concentrating tower, as image 3 As shown, it comprises a reactive distillation tower 1, an extraction tower 2 and a recovery tower 4, the middle part of the reactive distillation tower 1 is provided with a feed inlet, and the top material outlet of the reactive distillation tower 1 is connected with the material inlet of the condenser 15 , the material outlet of condenser I 5 is connected with the inlet of reflux tank I 6, the outlet of reflux tank I 6 is connected with the inlet of pump II 7, and the outlet of pump II 7 is respectively connected with the top reflux port of reactive distillation column 1 and the extraction tower The material inlet of 2 is connected; the top material outlet of extraction tower 2 is connected with the material inlet of recovery tower 4, and the bottom of recovery tower 4 is provided with paraformaldehyde...

Embodiment 3

[0037] Embodiment 3: as figure 1 As shown, the method for synthesizing paraformaldehyde by salt effect reactive distillation using the device of Example 1 comprises the following steps: (1) reactive distillation generates a paraformaldehyde synthetic liquid; (2) extracts a paraformaldehyde synthetic liquid to obtain a rich The extract phase containing paraformaldehyde and the raffinate phase rich in water and formaldehyde; (3) the raffinate phase is concentrated and recovered formaldehyde solution; (4) the extraction agent is separated and recovered in the extract phase to obtain a paraformaldehyde product; wherein,

[0038] (1) Reactive distillation generates paraformaldehyde synthesis liquid: formaldehyde solution, catalyst and salt additives are added to the reactive distillation tower through the feed port provided in the middle of the reactive distillation tower, wherein the concentration of the feed formaldehyde solution is 65wt%; The concentration of catalyst sulfuric a...

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Abstract

The invention discloses a device and a method for synthesizing trioxymethylene by salt effect reactive rectification. The device comprises a reactive rectification tower, an extraction tower, a concentration tower, a recovery tower and the like; the method comprises the following steps: (1) reacting and rectifying to generate a trioxymethylene synthetic liquid; (2) extracting the trioxymethylene synthetic liquid to obtain an extract phase rich in trioxymethylene and a raffinate phase rich in water and formaldehyde; (3) concentrating the raffinate phase to recover the formaldehyde solution; and(4) separating and recovering the extraction agent from the extraction phase to obtain a trioxymethylene product. The device and the method for synthesizing trioxymethylene by salt effect reactive rectification are high in formaldehyde conversion rate, high in production efficiency, high in trioxymethylene product purity, short in process and low in energy consumption, and have popularization andapplication performance.

Description

Technical field: [0001] The invention relates to a device and method for synthesizing paraformaldehyde by reactive distillation, in particular to a device and method for synthesizing paraformaldehyde by reactive distillation based on salt effect. Background technique: [0002] Paraformaldehyde is an important chemical raw material, which has been widely used in the preparation of anhydrous formaldehyde, pesticides, molding materials, adhesives, disinfectants, antibacterials and other products. At present, the industry mainly adopts 50-65wt% formaldehyde aqueous solution as raw material, acid as catalyst, and obtains paraformaldehyde with relatively high content in the gas phase through multiple distillations in the reactive distillation tower. The equilibrium concentration of paraformaldehyde in the bottom liquid of this process reaction rectification tower is about 3wt%, and the relative volatility between the separated components is low. The ratio is high, resulting in hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/14B01D3/00B01D11/04C07D323/06
CPCB01D3/14B01D11/04B01D3/009C07D323/06Y02P20/10
Inventor 张先明李艳萍
Owner 鄂尔多斯应用技术学院
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