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Process for synthesizing triformol using ionic liquid

An acidic ionic liquid, cation technology, applied in chemical instruments and methods, preparation of organic compounds, organic compounds/hydrides/coordination complex catalysts, etc. Low, easy-to-prepare effect

Inactive Publication Date: 2008-11-26
富艺国际工程有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Attempts to use acidic ion exchange resins or supported phosphoric and sulfuric acids have been used instead without good results

Method used

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  • Process for synthesizing triformol using ionic liquid
  • Process for synthesizing triformol using ionic liquid
  • Process for synthesizing triformol using ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In a 250ml reactor, 100g of 60.1% formaldehyde solution (containing methanol 1.2%) and 4.1g of catalyst a were added successively. Heat to reflux for 4 hours, adjust the reflux ratio R=2, formaldehyde, product paraformaldehyde and water azeotrope are distilled from the top of the tower, and at the same time add 50g of 60.1% formaldehyde solution (feed rate: 0.5mL / min). The temperature at the bottom of the rectification tank was 96-97°C, the temperature at the top of the tower was 92-93°C, and the material was discharged for 3 hours. According to chromatographic analysis, the content of paraformaldehyde in the distillate was 17.8%, the content of methanol was 0.9%, and the content of methylal was 0.2%.

Embodiment 2

[0042] With embodiment 1, use 2.0g catalyst b, add in the formaldehyde solution (containing methanol 1.5%) of 200g 50.3%, bottom temperature 96-97 ℃, tower top temperature 92-93 ℃, paraformaldehyde in the distillate The content of methanol is 18.2%, the content of methanol is 1.7%, and the content of methylal is 0.8%.

Embodiment 3

[0044] Same as in Example 1, using 2.5g of catalyst c, added to 110g of 50.3% formaldehyde solution (containing 1.5% methanol), the temperature at the bottom of the tank was 96-97°C, the temperature at the top of the tower was 91-92°C, and the paraformaldehyde in the distillate was The content of methanol is 26.1%, the content of methanol is 1.1%, and the content of methylal is 0.3%.

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Abstract

The invention discloses a method for synthesizing trioxymethylene, wherein, formalin solution is taken as reactant and acidic ionic liquid is taken as a catalyst, and the dosage of the catalyst is 0.01-10% by weight.

Description

technical field [0001] The invention relates to a method for catalyzing and synthesizing paraformaldehyde from an aqueous formaldehyde solution through an acidic ionic liquid. Paraformaldehyde is an industrial raw material, especially an important raw material for the manufacture of polyoxymethylene resin and a bulk organic chemical raw material to replace formaldehyde. Background technique [0002] Paraformaldehyde is a white crystal with stable properties. It is used as a stabilizer, fumigant, insecticide, molding material, adhesive, disinfectant, antibacterial, etc. in color photos. It can be depolymerized to generate formaldehyde, so it can be used in almost all formaldehyde reactions, especially when anhydrous formaldehyde is required as a reactant, its application is more valuable. At the same time, paraformaldehyde is the monomer raw material for the synthesis of polyoxymethylene, which is one of the world's three major general-purpose engineering plastics and the on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/30C07C41/56B01J31/02
CPCC07D323/06
Inventor 陈静宋河远夏春谷李臻唐中华张新志郭恩修
Owner 富艺国际工程有限公司
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