Method for dehydrating and concentrating formaldehyde solution

A formaldehyde solution and formaldehyde technology, applied in chemical instruments and methods, preparation of organic compounds, separation/purification of carbonyl compounds, etc., can solve the problems of increased side reactions and increased separation difficulty, and achieve reduced energy consumption and reduced water content , The effect of increasing permeation flux

Active Publication Date: 2020-05-22
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the above-mentioned technology adopts membrane separation technology, there are still the following problems: non-formaldehyde source substances such as carboxylate and methanol are added in the dehydration process, and methanol reacts with formaldehyde to stabilize the existence of hemiacetal, resulting in increased separation difficulty and Increased side effects

Method used

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  • Method for dehydrating and concentrating formaldehyde solution

Examples

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Effect test

Embodiment 1

[0025] In this example, no dehydration aid is added, and as a comparative example, the intermittent membrane dehydration process is described with 37% formaldehyde aqueous solution.

[0026] Add 37% formaldehyde solution into the dehydration storage tank, heat the formaldehyde solution to 110°C with a heater, and adjust the formaldehyde solution to flow into the membrane module at a flow rate of 200ml / min through the feed pump and the regulating valve (5 grades of NaA molecular sieve membranes in series, The total membrane area is 0.14m 2 ), concentrated and dehydrated at a constant temperature of 110°C. The vacuum pump maintains an absolute pressure of 5000Pa on the permeate side, and the permeate is condensed by the vacuum condenser and collected in the permeate storage tank. After a certain period of concentration and dehydration, measure the water content in the formaldehyde solution.

[0027] The permeate flux of the concentrated dehydration performance, the water conte...

Embodiment 2

[0032] In this example, no dehydration aid is added, and as a comparative example, the intermittent membrane dehydration process is described with 50% formaldehyde aqueous solution.

[0033] Using 50% formaldehyde aqueous solution as a raw material, the concentration and dehydration temperature is 125° C., and flows through the membrane surface at a flow rate of 300 ml / min. Concentration and dehydration were carried out using the same dehydration process as in Example 1.

Embodiment 3

[0035] The present embodiment is to 37% formaldehyde aqueous solution and PODE 2 The mixture is subjected to a membrane dehydration process.

[0036] 37% formaldehyde solution and PODE 2 Mixed, as a dehydrated concentrated raw material, where PODE 2 The mass ratio of the added amount to formaldehyde is 3.7:1.0. The concentration and dehydration temperature is 110°C, and the flow rate of 100ml / min flows through the membrane surface. Concentration and dehydration were carried out using the same dehydration process as in Example 1.

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Abstract

The invention discloses a method of dehydrating and concentrating a formaldehyde solution. The method comprises the following steps: mixing the formaldehyde solution with a dehydrating auxiliary agent, wherein the mass ratio of the dehydrating auxiliary agent to formaldehyde is greater than 0.1; and removing water in the formaldehyde solution by means of a membrane dehydration separation technology. The method disclosed by the invention can be independently used and also can be integrated and combined with a conventional formaldehyde concentration method, so that a purpose of deep dehydration of formaldehyde and energy consumption reduction is achieved. The method disclosed by the invention is suitable for producing formaldehyde and suitable for a chemical process taking formaldehyde as a raw material.

Description

technical field [0001] The invention provides a new method for dehydrating and concentrating formaldehyde solution, which is suitable for the production of formaldehyde and the chemical process using formaldehyde as a raw material, and belongs to the technical field of chemical separation. Background technique [0002] Formaldehyde is a bulk organic chemical product and intermediate, widely used in chemical industry, wood processing, chemical fiber, medicine, pesticide and many other fields. At present, formaldehyde is mainly used in the production of urine aldehyde, phenolic formaldehyde and melamine formaldehyde resin in wood processing, and secondly in the manufacture of pentaerythritol, urotropine, diphenylmethane diisocyanate, 1,4-butanediol and trihydroxymethylpropane , neopentyl glycol, methylal, paraformaldehyde, paraformaldehyde, polyoxymethylene, pyridine and their compounds and other chemical products, as well as long-acting slow-release fertilizers, medicines, pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C47/058C07C45/78C07C45/86
CPCC07C45/786C07C45/86C07C47/04
Inventor 张小明雷骞张文东洪正鹏冯孝庭
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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