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Production device system and production process for polymethoxy dimethyl ether (PODE)

A polymethoxydimethyl ether, production device technology, applied in the preparation of organic compounds, chemical instruments and methods, organic chemistry, etc., can solve the problem that formaldehyde is difficult to separate, economic feasibility is not advantageous, catalysts and trioxymethylene prices. expensive, etc.

Active Publication Date: 2014-06-11
DONGYING RUNCHENG CARBON MATERIAL TECH +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Domestic research is mainly concentrated in the Lanzhou Institute of Chemical Physics of the Chinese Academy of Sciences and the Shanghai Research Institute of Sinopec. The Chinese invention patent CN102701923A discloses a method using methanol and paraformaldehyde as raw materials and ionic liquid as a catalyst. The reaction conditions of this process are mild and the separation is simple. The main problem is that the catalyst and paraformaldehyde are expensive, so the economic feasibility is not advantageous, but it is of some strategic importance
Chinese patent CN102040491A discloses a method for preparing polyoxymethylene dimethyl ether using methanol, methylal, and paraformaldehyde as raw materials, which mainly involves the catalyst preparation method and does not involve the separation of products
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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  • Production device system and production process for polymethoxy dimethyl ether (PODE)
  • Production device system and production process for polymethoxy dimethyl ether (PODE)
  • Production device system and production process for polymethoxy dimethyl ether (PODE)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] First drop into 600 kilograms of macroporous strong acid resins, 2700 kilograms of paraformaldehydes in reactor 10, pump 3700 kilograms of methylals into reactor 10 from methylal storage tank 2 with pump 5;

[0060] Start the reactor stirrer to fully mix the catalyst and the reaction materials, pass heating steam or heat transfer oil into the jacket of the reactor, slowly heat the reactor to 150°C and keep the temperature for 6 hours, the reaction reaches equilibrium, stop heating, and take samples to analyze the reaction Product composition, the results are shown in Table 1 (expressed in weight percent).

[0061] Use the pump 11 to pump the reaction product into the cooler 13 through the pipeline 12 to lower the temperature of the material to 40 ° C, then enter the first rectification tower 16 after entering the deacidification adsorber 14 to remove formic acid; the deacidification adsorber is equipped with 500 kg load type Solid alkali, the superficial velocity of the...

Embodiment 2

[0068] First drop into 600 kilograms of solid superacids, 1200 kilograms of paraformaldehyde in reactor 10, pump 3900 kilograms of light components by pump 4 through pipeline 7 from light component storage tank, pass pipeline 9 by pump 6 from heavy component storage tank Pump 1200 kilograms of heavy components, technological process is as example 1, and final result is shown in Table 2.

[0069] Table 2 Weight percentage and total amount of related logistics

[0070]

[0071] In Example 2, the reaction mass gross weight: 1200+3900+1200=6300 kilograms, wherein PODE 5-8 The content is: 1200÷6300=19%. As can be seen from stream 12 in table 2, PODE in the reaction product 5-8 The content is only 3.82%, indicating that most of the heavy component PODE 5-8 It can be completely converted into the target product PODE by re-reaction 3-4 ;

[0072] Comparing Table 1 and Table 2, target product PODE3-4 is 12.29+6.36%=18.65% in example 1, target product PODE in example 2 3-4 Be 1...

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Abstract

The invention provides a production device system for preparing polymethoxy dimethyl ether (PODE) and a process for preparing the PODE by using the production device system. The production device system comprises a reaction system, an adsorption deacidification system, a first rectification tower system, an adsorption dewatering system, a second rectification tower system and a third rectification tower system. The production device system and the process disclosed by the invention have the advantages that (1) a reaction product is subjected to deacidification before rectification separation, so that decomposition of the reaction product in the rectification separation process is avoided; (2) the reaction product is subjected to deacidification by adopting a fixed bed, so that waste alkali residue produced by an alkali washing method is avoided; (3) un-reacted materials are dewatered before circular reaction, so that excessive hemiacetal byproduct produced due to excessive water of the reaction system is avoided; (4) unreacted methylal, formaldehyde, PODE2 and PODE5-8 are returned to a reactor after rectification separation and reacted, so that the yield of the target product PODE3-4 is improved.

Description

[0001] technical field [0002] The present invention belongs to the field of production of novel green fuel oil components and environment-friendly solvents. The invention relates to a production device system and process of a novel green fuel oil component and environment-friendly solvent polyoxymethylene dimethyl ether. Background technique [0003] Polyoxymethylene dimethyl ether (referred to as PODE), molecular formula: CH 3 O(CH 2 O) n CH 3 (where n≥1, PODE with different n, take PODE n express). where PODE 2 The boiling point is 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. PODE 3-8 It 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 ...

Claims

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Application Information

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IPC IPC(8): C07C43/30C07C41/56C07C41/58
CPCC07C41/56C07C41/58C07C43/30
Inventor 王云芳陈建国邢金仙司继亮延荣贵邢燕
Owner DONGYING RUNCHENG CARBON MATERIAL TECH
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