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Refining method for polyformaldehyde dimethyl ether

A technology of dimethyl ether and purification method, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problem of unfavorable expansion of production, affecting continuous and stable operation of the separation process of polyoxymethylene dimethyl ether, and processing time. long-term issues

Active Publication Date: 2018-12-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method needs to be condensed and refluxed for 2 hours, and the processing time is long, which is not conducive to expanding production
[0008] Therefore, the separation of formaldehyde is a technical bottleneck affecting the continuous and stable operation of the separation process of polyoxymethylene dimethyl ether

Method used

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  • Refining method for polyformaldehyde dimethyl ether
  • Refining method for polyformaldehyde dimethyl ether
  • Refining method for polyformaldehyde dimethyl ether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The reaction equilibrium mixture obtained by catalytic reaction with paraformaldehyde and methylal as raw materials is firstly subjected to atmospheric distillation in the first rectification tower to remove the first fraction to obtain the first tower still liquid with a temperature of 105°C. The kettle liquid of the first tower enters from the bottom through the insulation pipeline with Ca(OH) 2 It is a packing purification tower, the temperature of the purification tower is 100℃, the residence time is 10min, and the top of the tower contains methanol and PODE 2-5 The purification tower material. The discharge from the purification tower enters the dehydration tower, where the operating pressure is normal pressure, the reflux ratio is 8, and the tower bottom temperature is 110°C. The distillation is carried out, and fractions containing methanol and water are extracted from the top of the tower. The still liquid of the dehydration tower enters the second rectification t...

Embodiment 2

[0038] The reaction equilibrium mixture obtained by catalytic reaction with paraformaldehyde and methylal as raw materials is firstly subjected to atmospheric distillation in the first rectification tower to remove the first fraction to obtain the first tower still liquid with a temperature of 105°C. The kettle liquid of the first tower enters the purification tower with NaOH as the filler from the bottom through the insulated pipeline. The temperature of the purification tower is 100℃, the residence time is 10min, and the top of the tower contains methanol and PODE. 2-5 The purification tower material. The discharge from the purification tower enters the dehydration tower, where the operating pressure is normal pressure, the reflux ratio is 8, and the tower bottom temperature is 110°C. The distillation is carried out, and fractions containing methanol and water are extracted from the top of the tower. The still liquid of the dehydration tower enters the second rectification tow...

Embodiment 3

[0040] The reaction equilibrium mixture obtained by catalytic reaction with paraformaldehyde and methylal as raw materials is firstly subjected to atmospheric distillation in the first rectification tower to remove the first fraction to obtain the first tower still liquid with a temperature of 105°C. The kettle liquid in the first tower enters the Ca(OH) with a weight ratio of 1:1 from the bottom through the insulated pipeline 2 A purification tower with a mixture of NaOH and NaOH as packing. The temperature of the purification tower is 100℃, the residence time is 10min, and the top of the tower contains methanol and PODE. 2-5 The purification tower material. The discharge from the purification tower enters the dehydration tower, where the operating pressure is 0.2Mpa, the reflux ratio is 8, and the bottom temperature of the tower is 110°C. The distillation is carried out, and fractions containing methanol and water are extracted from the top of the tower. The still liquid of th...

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Abstract

The technical purpose is to solve the problem that in the process of refining polyformaldehyde dimethyl ether by adopting a distillation method, formaldehyde exists and makes the long-term continuousproduction operation difficult. The method comprises the following steps that a polyformaldehyde dimethyl ether unit is synthesized to obtain a reaction equilibrium mixture, firstly, first distillatemainly comprising methylal is separated and removed to obtain first tower bottom liquid, the first tower bottom liquid flows into a purifying tower from the bottom, and purified tower material liquidcomprising methyl alcohol and PODE2-8 is obtained from the tower top; the purified tower material liquid successively flows into a dehydrating tower, a second rectifying tower and a third rectifying tower, and methyl alcohol-aqueous distillate, a PODE2 product and a PODE3-4 / PODE3-5 product are separately obtained from the tower top.

Description

Technical field [0001] The present invention relates to a method for refining polyoxymethylene dimethyl ether, in particular to the preparation of high-purity PODE from a reaction mixture containing polyoxymethylene dimethyl ether obtained from the reaction of paraformaldehyde as a raw material 3~4 / PODE 3~5 Methods. Background technique [0002] With the rapid increase of energy consumption in modern society, the increasingly tense petroleum resources, and the increasing environmental pressure, there is an urgent need to develop new clean diesel fuels. Using oxygen-containing compounds as diesel fuel additives without adding additional equipment or changing the engine structure is a convenient and effective measure and has become a new idea for the development of the petroleum industry. [0003] Polyoxymethylene dimethyl ether (PODE) is an oxygen-containing compound with the general formula: CH 3 O(CH 2 O)nCH 3 , Where n is an integer greater than or equal to 1 (generally less th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C41/58C07C43/30
CPCC07C41/58C07C43/30
Inventor 裴义霞顾军民赵精彩
Owner CHINA PETROLEUM & CHEM CORP
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