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Method for removing formic acid online in the process of trioxymethylene synthesis

A paraformaldehyde synthesis process technology, applied in fractionation, organic chemistry, etc., can solve problems that affect the normal progress of paraformaldehyde synthesis reactions, affect the quality of paraformaldehyde products, increase equipment and processing costs, and achieve low operating costs , Reduce energy consumption, low cost of raw materials

Active Publication Date: 2012-10-03
BEIJING RISUN TECH CO LTD
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  • Summary
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, formic acid will affect the product quality of paraformaldehyde, on the other hand, the accumulation of formic acid in the reaction system will also affect the normal progress of the paraformaldehyde synthesis reaction
In the existing production process, the formic acid generated during the synthesis of paraformaldehyde is often removed through subsequent treatment procedures, which not only increases equipment and processing costs, but also is not conducive to the continuous progress of the synthesis process of paraformaldehyde

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In a 500mL reactor, add 200g of 58.7wt% formaldehyde solution and 8.1g of acidic ionic liquid catalyst. Control the temperature of the oil bath to 125°C, and the temperature in the reactor to 100°C. The mixture gas of formaldehyde, product paraformaldehyde and by-product formic acid in the reaction kettle will continue to fractionate and return to the reaction kettle after passing through the formic acid removal device to complete the reactive distillation process.

[0030] The formic acid removal device is a 500mL three-necked bottle placed in an oil bath at 105°C, and the bottle contains 5wt% CaCO 3 Suspension, the internal temperature of the solution is 90°C.

[0031] After the reaction is stable, adjust the reflux ratio R=2, and at the same time, add 58.7wt% formaldehyde solution at the flow acceleration rate of 50ml / h. The paraformaldehyde product was extracted at a rate of 50ml / h.

[0032] According to gas chromatography analysis, the extracted product componen...

Embodiment 2

[0034] Add 2wt% MgCO to the formic acid removal unit 3 Suspension, all the other reaction conditions are with embodiment 1. According to gas chromatography analysis, the extracted product components are formaldehyde 18.94wt%, paraformaldehyde 18.48wt%, methanol 1.92wt%, formic acid 127.56ppm, and the remaining components are water.

Embodiment 3

[0036] Add 0.6wt% BaCO to the formic acid removal unit 3 Suspension, all the other reaction conditions are with embodiment 1. According to gas chromatography analysis, the extracted product components are 21.92wt% formaldehyde, 22.04wt% paraformaldehyde, 2.63wt% methanol, 194.68ppm formic acid, and the remaining components are water.

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Abstract

The invention discloses a method for removing formic acid online in the process of trioxymethylene synthesis. The method is characterized in that the formic acid is removed by enabling reaction mixed gas to pass through basic salt solution to convert the formic acid into formate. The method can effectively remove the formic acid, is favorable for improving quality of trioxymethylene products, and promotes continuous stable production of the trioxymethylene products.

Description

technical field [0001] The invention relates to an online method for removing formic acid in paraformaldehyde reactants by using alkaline salt solution. Background technique [0002] Polyoxymethylene products have excellent chemical resistance stability, high mechanical strength and good plasticity and other excellent properties, so they have been widely used in many fields such as automobile manufacturing, machinery manufacturing, electrical and electronic instruments, building materials, and daily light industry. Applications. Polyoxymethylene polymerization is the most important production method of polyoxymethylene at present. Therefore, the synthesis technology of paraformaldehyde is the key technology of polyoxymethylene synthesis process. In addition to being used to produce polyoxymethylene resin, paraformaldehyde is also an important chemical raw material, which can be used in various reactions that require formaldehyde. Especially, when anhydrous formaldehyde nee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D323/06B01D3/14
Inventor 张英伟高毅张敏生孙长江
Owner BEIJING RISUN TECH CO LTD
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