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Combined process for preparing poly methoxy-dimethyl ether

A technology of polyoxymethylene dimethyl ether and combined process, which is applied in the preparation of organic compounds, chemical instruments and methods, organic chemistry, etc., can solve the problems such as difficult separation of formaldehyde, and achieve simple equipment, suitable for industrialization promotion, and process Reasonable effect of process route

Inactive Publication Date: 2013-10-23
DONGYING RUNCHENG CARBON MATERIAL TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The difficulty in product refining and separation is that formaldehyde in the product is difficult to separate and accompanied by by-products decomposing formaldehyde, so that the product contains formaldehyde, which is why there is no industrial production device now

Method used

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  • Combined process for preparing poly methoxy-dimethyl ether
  • Combined process for preparing poly methoxy-dimethyl ether
  • Combined process for preparing poly methoxy-dimethyl ether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Put 600 grams of acidic ion exchange resin, 2,700 grams of paraformaldehyde, and 3,700 grams of methylal into the reactor respectively, slowly heat to 150°C for 3 hours, then pump the reaction solution into the membrane separation dehydrator at 12 L / hr, and put The water in the reaction solution was removed and then returned to the reactor, and samples were taken from the reactor every 1 hour to analyze the composition of reactant grade products in the system. The results are shown in Table 1.

[0022] Table 1

[0023]

Embodiment 2

[0025] Put 600 grams of acidic ion exchange resin, 2,700 grams of paraformaldehyde, and 3,700 grams of methylal into the reactor respectively, and slowly heat to 150°C for 2 hours at a constant temperature, then pump the reaction liquid into the membrane separation dehydrator at 8 L / hr. The water in the reaction solution was removed and then returned to the reactor, and samples were taken from the reactor every 1 hour to analyze the composition of reactant grade products in the system. The results are shown in Table 2.

[0026] Table 2

[0027]

Embodiment 3

[0029] Put 600 grams of acidic ion exchange resin, 2,700 grams of paraformaldehyde, and 3,700 grams of methylal into the reactor respectively, and slowly heat to 150°C for 2 hours at a constant temperature, then pump the reaction liquid into the membrane separation dehydrator at 6 L / hr, and put The water in the reaction solution was removed and then returned to the reactor, and samples were taken from the reactor every 1 hour to analyze the composition of reactant grade products in the system. The results are shown in Table 3.

[0030] table 3

[0031]

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PUM

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Abstract

The invention relates to a combined process for preparing poly methoxy-dimethyl ether. According to the method, methylal and paraformaldehyde are used as reactants and a solid acid is used as a catalyst. The combined process comprises the following steps of feeding raw materials: adding the solid acid catalyst and solid paraformaldehyde in a reactor, then adding methylal in the reactor and stirring the above materials uniformly; meting and reacting: heating the reactor slowly and reacting for 2-6 hours by keeping a temperature within 100-200 DEG C and a pressure between 0.1 MPa and 2 MPa; dehydrating the reaction liquid: pumping the reaction liquid into a film separation and dehydration device at a flow velocity of 5-15 L / hr so as to remove water in a reaction mixture and send the water to the reactor; and circulating the reaction materials: circulating the reaction materials between the reactor and the film separation and dehydration device, dehydrating while reacting, and taking a sample for analysis every one hour until methylal is completely reacted. By the combined process, water generated during the reaction process is removed continuously, thereby allowing paraformaldehyde to be reacted completely and benefiting the separation of reaction products. The process is simple in use of apparatuses, reasonable in process flow and suitable for large-scale popularization.

Description

technical field [0001] The invention relates to the technical field of preparation of fuel and fuel oil additives, in particular to a combined process for preparing polyoxymethylene dimethyl ether. Background technique [0002] Polyoxymethylene dimethyl ether (referred to as PODE), molecular formula: CH3O (CH2O) n CH 3 (where n≥1, PODEs with different n are represented by PODEn). Among them, PODE2 has a boiling point of 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. PODE3-8 is an excellent diesel additive component with high oxygen mass fraction (ranging from 42% to 51%) and cetane number (above 60). Adding 20% ​​to catalytic diesel can increase its cetane number by 20-30 points, and at the same time improve the combustion quality of diesel in the engine, increase thermal efficiency, and reduce pollutant emissions, so it is considered to have great applicatio...

Claims

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Application Information

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IPC IPC(8): C07C43/30C07C41/56
Inventor 王云芳陈建国邢金仙延荣贵李彤彤李海丽司书昊
Owner DONGYING RUNCHENG CARBON MATERIAL TECH
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