Normal temperature liquid phase adsorption and membrane separation dehydration method for polyoxymethylene dimethyl ether

A technology of polyoxymethylene dimethyl ether and liquid phase adsorption, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., and can solve the difficulty of rectification and separation, the increase of investment cost, energy consumption and operating cost and other issues to achieve the effect of ensuring complete independent operation, ensuring continuity, and simple processing

Inactive Publication Date: 2015-06-24
SICHUAN TECHAIRS
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Problems solved by technology

[0004] Polyoxymethylene dimethyl ethers (DMMn, n=1~8) have different boiling points at normal pressure, therefore, the separation of the above reaction mixture in the prior art can adopt the method of normal pressure rectification, that is, water and heavy components are firstly separated. Polymethoxy dialkyl ether is separated and separated from light component methylal at the same time, so if water is to be separated from light component and heavy component, two rectification towers need to be added, one with One is used for the separation of light components, and one is used for the separation of heavy components, so that investment costs, energy consumption and operating costs will increase accordingly
And the boiling point of water is very close to the boiling point of DMM2, so the difficulty of rectification separation is relatively large

Method used

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  • Normal temperature liquid phase adsorption and membrane separation dehydration method for polyoxymethylene dimethyl ether
  • Normal temperature liquid phase adsorption and membrane separation dehydration method for polyoxymethylene dimethyl ether
  • Normal temperature liquid phase adsorption and membrane separation dehydration method for polyoxymethylene dimethyl ether

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Embodiment 1

[0042] A method for normal temperature liquid phase adsorption and membrane separation and dehydration of polyoxymethylene dimethyl ether described in this embodiment comprises the following steps:

[0043] (a) At room temperature, send the polyoxymethylene dimethyl ether to be dehydrated into an adsorption tower equipped with an adsorbent for adsorption treatment, and the adsorbed polyoxymethylene dimethyl ether is discharged from the adsorption tower and enters the product In the collection tank, the adsorbent here can be one, two or more of molecular sieves, silica gel, activated alumina, and resins, which can be determined according to needs;

[0044] (b) When the adsorbent reaches saturation, the adsorption value at this time is not necessarily the maximum adsorption value, but the adsorption effect of the adsorbent on water at this time cannot make the water content of polyoxymethylene dimethyl ether meet the requirements. Critical value, stop feeding at this time, and r...

Embodiment 2

[0067] like Figure 4 As shown, the present embodiment takes two adsorption towers as an example to introduce the whole dehydration process of polyoxymethylene dimethyl ether. Among the figures, A, B, C, D, T, a, b, c, t, and d are all valve;

[0068] (1) Open the valves T, A, and D, and send the polyoxyl dimethyl ether with a water content of 0.8% into the adsorption tower 1 through the pump 1, and the polyoxyl dimethyl ether is adsorbed in the adsorption tower 1 for 8 hours. The polyoxymethylene dimethyl ether after adsorption enters in the product collection tank from the top of adsorption tower one;

[0069] (2) Close valves A and D of adsorption tower one, open valves B, a, t and d, discharge the residual polyoxymethylene dimethyl ether and water in adsorption tower one, and at the same time pump the raw material polyoxymethylene dimethyl ether through pump one The base dimethyl ether is sent to the second adsorption tower for dehydration;

[0070] (3) After the adsorp...

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Abstract

The invention discloses a normal temperature liquid phase adsorption and membrane separation dehydration method for polyoxymethylene dimethyl ether. The method comprises the following steps: (a) feeding to-be-dehydrated polyoxymethylene dimethyl ether into an adsorption tower filled with an adsorption agent, carrying out adsorption, discharging adsorbed polyoxymethylene dimethyl ether from the adsorption tower, and adding adsorbed polyoxymethylene dimethyl ether into a product collection tank; (b) after the adsorption agent reaches a certain adsorption value, stopping feeding, regenerating the adsorption agent, draining desorption liquid from the bottom of the adsorption tower in the regenerating process, adding materials which are subjected to primary membrane separation dehydration into a raw material liquid pipeline, carrying out deep dehydration in the adsorption tower, and starting adsorption after the regeneration is finished in the adsorption tower; and (c) circularly carrying out the steps (a and b). By virtue of a process, few devices are used in the whole process, and the operation is simple; by virtue of smart process condition selection, and the dehydration efficiency and the dehydration quality can be effectively improved.

Description

technical field [0001] The invention relates to the field of refining polyoxymethylene dimethyl ether, in particular to a method for normal temperature liquid phase adsorption and membrane separation and dehydration of polyoxymethylene dimethyl ether. Background technique [0002] Polyoxymethylene dimethyl ether (DMMn, n=1~8) is a downstream product of methanol, and its main production method is the condensation of methanol with formaldehyde or a series of derivatives of formaldehyde (such as methylal and paraformaldehyde). With the development of coal chemical industry, the coal-to-methanol technology is mature, and its output greatly exceeds the demand. It is necessary to develop downstream products of methanol to ensure the healthy development of coal chemical industry. [0003] Gasoline and diesel are the largest consumption of liquid fuels in my country and cause serious pollution. In order to improve the combustion performance of gasoline and diesel and reduce air pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/30C07C41/58
CPCC07C41/58C07C43/30
Inventor 钟雨明陈运唐金财
Owner SICHUAN TECHAIRS
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