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A method and device for refining anhydrous pure formaldehyde gas

A formaldehyde gas and refining method technology, applied in the separation/purification of carbonyl compounds, organic chemistry, etc., can solve the problems of high cost and complicated process, and achieve the effect of high cost, simple process and low energy consumption

Inactive Publication Date: 2017-06-06
JIANGSU KAIMAO PETROCHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process is complicated and the cost is high

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  • A method and device for refining anhydrous pure formaldehyde gas

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Embodiment Construction

[0019] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0020] Such as figure 1 As shown, the 37%-85% formaldehyde solution is preheated to 50-100°C and pumped into the upper part of the extraction tower, and the fresh adjuvant and circulating adjuvant are pumped into the lower part of the extraction tower together, and the feed temperature is controlled at 50-100°C. A preferred adjuvant is isobutanol, 4-methyl-2-pentanol and cyclohexanol can also serve the same function. The two are countercurrently contacted in the packed ...

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Abstract

The invention discloses a method for refining anhydrous pure formaldehyde gas and a process device; an assistant agent, which is insoluble in water, not reacted with water and only reacted with formaldehyde, is introduced in the process; the assistant agent and a formaldehyde solution are reacted to obtain a hemiacetal reactant; the hemiacetal reactant is insoluble in water; furthermore, reverse reaction decomposition of a thermosensitive substance, the density of which is less than that of water, is easily carried out at an excessively high temperature; and pure formaldehyde gas and a liquid assistant agent are obtained by heating and decomposing. The method disclosed by the invention is simple in process, low in energy consumption, simple to operate and less in influence to the environment.

Description

technical field [0001] The invention belongs to the technical field of chemical production technology and equipment, and mainly relates to a method and equipment for refining anhydrous formaldehyde gas. Background technique [0002] Formaldehyde is one of the most important downstream products of methanol, and methanol is an important downstream product of coal. Therefore, formaldehyde has become an important development branch in the field of energy and chemical industry. Formaldehyde is a raw material for various chemical products, and currently exists in the form of 37% formaldehyde aqueous solution on the market. The existence of a large amount of water not only affects the quality of certain chemical products, but also affects related reactions, resulting in a large number of unnecessary by-products or low conversion rates. At the same time, dehydration brings the problem of high energy consumption, so the existence of a large amount of water limits the use of formald...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C47/058C07C45/78
CPCC07C45/78C07C45/85C07C47/04
Inventor 叶子茂向家勇张鸿伟许引
Owner JIANGSU KAIMAO PETROCHEM TECH