Device and method for preparing polyoxymethylene dimethyl ether

A technology of polyoxymethylene dimethyl ether and paraformaldehyde, which is applied in the preparation of carbon-based compounds, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of no industrial production equipment, difficulty in refining and separation, etc. , Wide application range, high purity effect

Active Publication Date: 2015-01-21
DONGYING RUNCHENG CARBON MATERIAL TECH +2
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Problems solved by technology

[0008] In order to overcome the difficulties in refining and separating products of polyoxymethylene dimethyl ether prepared from methanol and methylal as raw materials in the prior ar

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  • Device and method for preparing polyoxymethylene dimethyl ether
  • Device and method for preparing polyoxymethylene dimethyl ether
  • Device and method for preparing polyoxymethylene dimethyl ether

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[0070] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention

[0071] The invention provides a device for preparing polyoxymethylene dimethyl ether by using methylal as raw material, including a formaldehyde area, a paraformaldehyde area, a polyoxymethylene dimethyl ether (PODE) area, and a tail gas and waste water treatment unit. The formaldehyde area includes feed and gasification system, air and absorption cycle gas feed system, oxidation system, formaldehyde absorption system and heat transfer oil-steam generation system. The paraformaldehyde area includes formaldehyde depolymerization system, formaldehyde evaporation system, spray granulation system, absorption tower system, washing tower system and dilute formaldehyde recovery system...

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Abstract

The invention provides a device and method for preparing polyoxymethylene dimethyl ether by using methanol or methylal. The device comprises a formaldehyde region, a methylal region, a paraformaldehyde region, a polyoxymethylene dimethyl ether (PODE) region and a tail gas and wastewater treatment region. Based on the device, the method comprises the following steps: oxidizing a raw material methanol or methylal to obtain formaldehyde; polymerizing the formaldehyde to obtain paraformaldehyde; carrying out reaction on the paraformaldehyde and the methylal to prepare polyoxymethylene dimethyl ether; and rectifying and separating to obtain PODE2 and PEDE3-4, wherein residual formaldehyde in reaction returns to the raw material to be recycled and tail gas and wastewater generated in reactions enter into tail gas and wastewater treatments for green discharge and recycling, respectively. The whole process flow of the device and the method provided by the invention is highly integrated, the utilization ratio of the raw material is high, the output of exhaust gas and wastewater is very low, and the product purity is high, so that the device and the method can be suitable for different raw materials and are wide in application range.

Description

technical field [0001] The invention relates to the field of production of novel green fuel oil components and environment-friendly solvents, in particular to a device and method for novel green fuel oil components and environment-friendly solvent polyoxymethylene dimethyl ether. [0002] Background technique [0003] Polyoxymethylene dimethyl ether (PODEn, n=2~8), alias polyoxymethylene dimethyl ether (DMMn, when n=1 is methylal), polyoxymethylene methylal, is a class of A low molecular weight acetal polymer with methoxymethane as the parent and methyleneoxy as the main chain, the molecular formula is CH 3 O(CH 2 O) n CH 3 , when n=1, the substance is methylal. where PODE 2 The boiling point is 105°C, and its solubility is far superior to that of aromatic hydrocarbons. It is a green and environmentally friendly solvent with great application prospects. PODE 3-4 It is a world-recognized environmentally friendly diesel additive. Its cetane number is greater than 80, a...

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Application Information

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IPC IPC(8): C07C43/30C07C41/56
CPCC07C41/56C07C41/58C07C45/38C08G2/08C07C47/04C07C43/30Y02P20/10
Inventor 王云芳刘孝礼陈建国司继亮邢金仙
Owner DONGYING RUNCHENG CARBON MATERIAL TECH
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