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Preparation method of trioxymethylene

A technology of paraformaldehyde and formaldehyde aqueous solution, which is applied in the direction of organic chemistry, can solve the problems of complex ionic liquid synthesis process and high cost, and achieve the effects of short reaction time, low equipment corrosion and simple preparation method

Inactive Publication Date: 2012-08-22
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of paraformaldehyde, which can overcome the disadvantages of complicated ionic liquid synthesis process and high cost in the prior art

Method used

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  • Preparation method of trioxymethylene
  • Preparation method of trioxymethylene
  • Preparation method of trioxymethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation of embodiment 1, paraformaldehyde

[0031] Add 60g of formaldehyde aqueous solution (formaldehyde content 60.0%) in reaction vessel, then add 2% (mass ratio with formaldehyde aqueous solution) Brφnsted acidic ionic liquid shown in formula I-1; Heat to 100 ℃, stirring reaction 1.5h, Through gas chromatographic analysis, the content of paraformaldehyde in the synthesis liquid is 2.44%, and the content of formic acid (in terms of acid value) is 3328ppm.

Embodiment 2

[0032] The preparation of embodiment 2, paraformaldehyde

[0033] Others are the same as in Example 1, using the Brφnsted acidic ionic liquid shown in formula I-2 as a catalyst, and the consumption is 5.0% (mass ratio with formaldehyde solution) of formaldehyde solution (formaldehyde content 48.0%); heated to 95 ° C, stirred for 1.5 h, the content of paraformaldehyde in the synthesis liquid is 1.35%, and the content of formic acid is 2433ppm.

Embodiment 3

[0034] The preparation of embodiment 3, paraformaldehyde

[0035] Others are the same as in Example 1, using the Brφnsted acidic ionic liquid shown in formula I-3 as a catalyst, and the dosage is 3.0% (mass ratio to the formaldehyde solution) of the formaldehyde solution (formaldehyde content 68.0%), heated to 100° C., and stirred for 2 hours , the content of paraformaldehyde in the synthetic liquid is 1.43%, and the content of formic acid is 2547ppm.

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Abstract

The invention discloses a preparation method of trioxymethylene. The preparation method comprises the following step that: formalin is reacted in the presence of a catalyst, and then the trioxymethylene is obtained, wherein the catalyst is Br phi nsted acidic ionic liquid; and the percentage by weight of the formalin is 30-70%. The Br phi nsted acidic ionic liquid adopted in the preparation method disclosed by the invention has the acidity of the ionic liquid and is liquid at a room temperature, so that the synthetic ionic liquid has great potential to be used as a reaction medium in trioxymethylene transformation. The Br phi nsted acidic ion liquid adopted in the preparation method is used as the catalyst, the dosage of the catalyst is small, the catalytic activity and the transformation rate are high, the catalyst and a product can be automatically separated after the reaction, the ionic liquid can be reused after being recovered, and the activity of the ionic liquid is slightly reduced.

Description

technical field [0001] The invention relates to a preparation method of paraformaldehyde. Background technique [0002] Paraformaldehyde has a wide range of uses. It is not only the monomer raw material for the synthesis of engineering plastic polyoxymethylene, but also can be used to prepare anhydrous formaldehyde and stabilizers, binders, insecticides, molding materials, fumigants, antibacterial drugs, disinfection At the same time, paraformaldehyde can also be depolymerized to generate formaldehyde, so it can be used in reactions using formaldehyde as a raw material, especially when anhydrous formaldehyde is required as a reactant, its application is more valuable. [0003] The synthesis method of paraformaldehyde is usually to evaporate and dehydrate 36% of industrial formaldehyde, concentrate it to about 65%, and synthesize paraformaldehyde under the action of acidic catalyst sulfuric acid. The content of paraformaldehyde in the reaction product is as high as about 2.8%...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D323/06
Inventor 操斌李为民白振敏陈步宁董奇何明阳陈群吴中
Owner CHINA NAT OFFSHORE OIL CORP
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