Refining method of polyoxymethylene dimethyl ether

A technology of dimethyl ether and refining method, which is applied in the fields of chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., and can solve problems affecting the continuous and stable operation of polyoxymethylene dimethyl ether separation process, unfavorable expansion of production, and processing time long wait question

Active Publication Date: 2021-09-03
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 of polyoxymethylene dimethyl ether
  • Refining method of polyoxymethylene dimethyl ether
  • Refining method of polyoxymethylene dimethyl ether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

Embodiment 2

[0038] The reaction equilibrium mixture obtained by catalytic reaction of paraformaldehyde and methylal as raw materials is firstly rectified by the first rectification tower at atmospheric pressure to remove the first fraction to obtain the first tower still liquid with a temperature of 105°C. The liquid in the first tower enters the purification tower filled with NaOH from the bottom through the insulation pipeline. The temperature of the purification tower is 100°C, and the residence time is 10min. 2-5 Purification tower material. The output of the purification tower enters the dehydration tower, and rectification is carried out under the conditions of operating pressure of normal pressure, reflux ratio of 8, and tower bottom temperature of 110°C, and fractions containing methanol and water are extracted from the top of the tower. The liquid in the dehydration tower enters the second rectification tower and the third rectification tower in turn, and PODE is separated from t...

Embodiment 3

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

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Abstract

The technical problem to be solved in the present invention is the difficulty in long-term continuous production and operation caused by the presence of formaldehyde in the process of refining polyoxymethylene dimethyl ether by rectification. Reaction equilibrium mixture, firstly separate and remove the first fraction mainly containing methylal, obtain the first tower bottom liquid, this material enters the purification tower from the bottom, and obtains methanol and PODE from the top of the tower 2‑8 The feed liquid of the purification tower; the feed liquid of the purification tower enters the dehydration tower, the second rectification tower and the third rectification tower in turn, and methanol-water fraction, PODE 2 Products and PODEs 3～4 / PODE 3～5 product.

Description

technical field [0001] The invention relates to a method for refining polyoxymethylene dimethyl ether, in particular to preparing high-purity PODE from a reaction mixture containing polyoxymethylene dimethyl ether obtained from a reaction in which paraformaldehyde is a raw material 3～4 / PODE 3～5 Methods. Background technique [0002] With the sharp increase of energy consumption in modern society, the increasing shortage of petroleum resources, and the increasing pressure on the environment, it is urgent to develop new clean diesel fuels. The use of oxygen-containing compounds as diesel additives is a convenient and effective measure without adding additional devices or changing the engine structure, 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 ≥ 1 (generally the value is less than 10, and for ...

Claims

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Application Information

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Patent Type & Authority Patents(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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