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
CN109096064BActive Publication Date: 2021-09-03CHINA PETROLEUM & CHEM CORP +1
15 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2021-09-03

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More