Process method for preparing polyoxymethylene dimethyl ethers

A technology of polyoxymethylene dimethyl ether and process method, which is applied in the field of preparing polyoxymethylene dimethyl ether, can solve the problems of complicated process method and high energy consumption, achieve simple process, reduce energy consumption and equipment investment, avoid Effect of polycondensation reaction

Active Publication Date: 2016-05-11
KAIRUI ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned process method is relatively complicated, and the energy consumption is high, and because formaldehyde is difficult to decompose and analyze once it is actually condensed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of processing method for preparing polymethoxy dimethyl ether DMM3~5, comprises the following steps:

[0044] (1) Formaldehyde is produced by adopting the known iron-molybdenum catalysis method to produce formaldehyde, but the formaldehyde gas that comes out from the oxidation reactor is not absorbed by water, but is cooled to an appropriate temperature and directly used in different polymerizations in the method of the present invention Absorption of polymethoxy dimethyl ether DMM1~2 and DMM6~10 mixture: heat 100g / h methanol to 95°C to vaporize into 44.9L / h methanol vapor with a pressure of 0.11MPa, mix with 748.9L / h air and After preheating to 270°C, enter the oxidation reactor 1 equipped with 39.7g iron-molybdenum catalyst for reaction, and generate a mixed gas of formaldehyde, water and air;

[0045] (2) Pass the mixed gas prepared in step (1) into the cooler 2 and cool to 70°C, then enter the gas-water separator 3 with a volume of 130 liters, stay here for 1...

Embodiment 2

[0052] A kind of processing method of preparing polyoxymethylene dimethyl ether DMM3~5, other processing conditions and method are identical with embodiment 1, just its initial raw material is 100g / h methylal, and step (6) is rectification at atmospheric pressure, The temperature at the bottom of the tower was controlled at 280°C, and the temperature at the top of the tower was at 156°C. Finally, the polyoxymethylene dimethyl ether product DMM3-5 with a target degree of polymerization of 187g / h was obtained:

[0053] In this embodiment, the reaction conversion rate of formaldehyde is 99.8%, and the total yield is 98.6%.

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Abstract

The invention discloses a process method for preparing polyoxymethylene dimethyl ethers. The method includes the steps that formaldehyde gas is cooled to 100 DEG C and below, so that vapor is removed; dehydrated gas formaldehyde is directly absorbed by a mixture of polyoxymethylene dimethyl ethers DMM1-2 and polyoxymethylene dimethyl ethers DMM6-10 of different degrees of polymerization, then a reaction is conducted, polyoxymethylene dimethyl ethers DMM 3-5 are prepared, and DMM1-2 and DMM 6-10 with the DMM 3-5 separated continuously serve as raw materials and are recycled. According to the method, formaldehyde gas generated by methanol oxidation is cooled to 100 DEG C and below, vapor is condensed into liquid water, the purpose of dehydration is achieved, and due to the fact that water in the formaldehyde is removed before being absorbed by reactant, and the situations that a polycondensation reaction occurs and device is blocked by paraformaldehyde generated by formaldehyde polycondensation are avoided; the mixture of the DMM1-2 and DMM6-10 also participates in a polymerization reaction and a depropagation reaction in the cyclic process and is finally converted to the polyoxymethylene dimethyl ethers DMM3-5 of the target degree of polymerization. The method is simple in process and easy to operate, the speed for generating the DMM3-5 is high, the conversion rate of the DMM3-5 is high, and energy consumption and equipment investment are lowered.

Description

technical field [0001] The invention relates to a process for preparing polymethoxy dimethyl ethers (DMM3-5). Polymethoxy dimethyl ethers (DMM1-2 and DMM6-10) with different degrees of polymerization are used to directly absorb methanol or methylate The formaldehyde gas produced by aldehyde oxidation is then polymerized to prepare polyoxymethylene dimethyl ether DMM3~5. Polyoxymethylene dimethyl ether with a degree of polymerization of 3~5 is most suitable as an additive for diesel oil, which can increase the cetane content of diesel oil. value. Background technique [0002] PolyoxymethyleneDimethylEthers (PolyoxymethyleneDimethylEthers), whose structural formula is: CH3O(CH2O)nCH3, referred to as DMMn (or PODEn), is a kind of polyether polymer, and DMM 3～5 The oxygen content is as high as 47-49%, and the cetane number is as high as 78-100. As a new type of environmentally friendly diesel additive, it can not only improve the combustion condition of diesel in the engine, bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/30C07C41/56C07C41/58C07C45/38C07C45/82C07C45/37C07C47/052C07C47/058
CPCC07C41/56C07C41/58C07C45/37C07C45/38C07C45/82C07C43/30C07C47/04
Inventor 刘文飞毛进池高永林
Owner KAIRUI ENVIRONMENTAL PROTECTION TECH
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