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Process unit and method for absorbing formaldehyde in polymethoxy dimethyl ether synthesis

A polymethoxydimethyl ether and process device technology, applied in chemical instruments and methods, chemical recovery, preparation of organic compounds, etc., can solve the problems of formaldehyde polymerization or disproportionation, low formaldehyde solubility, etc. Avoid the effects of self-polymerization and disproportionation reactions

Active Publication Date: 2015-08-05
JIANGSU KAIMAO PETROCHEM TECH
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Problems solved by technology

[0005] Purpose of the invention: In view of the above-mentioned problems and defects, the present invention provides a formaldehyde absorption process device and method in the synthesis of polyoxymethylene dimethyl ether, which completely overcomes the low solubility of formaldehyde in methylal, which is easy to cause non-absorption. Problems with Formaldehyde Polymerization or Disproportionation

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  • Process unit and method for absorbing formaldehyde in polymethoxy dimethyl ether synthesis
  • Process unit and method for absorbing formaldehyde in polymethoxy dimethyl ether synthesis
  • Process unit and method for absorbing formaldehyde in polymethoxy dimethyl ether synthesis

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[0021] 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.

[0022] This process selects PODE2, an intermediate component dimer of polyoxymethylene dimethyl ether with a higher boiling point. The boiling point of PODE2 is 105°C, and the amount of dissolved formaldehyde is much higher than that of methylal. It can completely solve the problem of formaldehyde gas phase not being absorbed and then polymerized. Formaldehyde and methylal are synthesized to obtain the chemical reaction process of polyoxymethylene dimethyl ether as foll...

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Abstract

The invention discloses a process unit and method for absorbing formaldehyde in polymethoxy dimethyl ether synthesis. According to the process, higher-boiling-point intermediate component dimer PODE2 of polymethoxy dimethyl ether is adopted, the formaldehyde dissolved amount is much higher than the methylal dissolved amount, and a PODE2 solution of formaldehyde is obtained, so that the operating pressure and temperature for the subsequent reaction are on the lower level, thereby avoiding the self-polymerization and disproportionation reaction of the formaldehyde, further avoiding the pipeline blockage, lowering the acid content in the polymethoxy dimethyl ether product, and finally enhancing the product yield.

Description

technical field [0001] The invention belongs to the technical field of chemical production technology and equipment, and mainly relates to a production process method of polyoxymethylene dimethyl ether. 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 in 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 Applications(China)
IPC IPC(8): C07C43/30C07C41/56C07C41/58
CPCC07C41/56C07C41/58C07C43/30Y02P20/582
Inventor 林立伟孙文文吴婷马凌
Owner JIANGSU KAIMAO PETROCHEM TECH
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