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DMF (N,N-Dimethyl Formamide) rectification dehydration purification method

A purification method and rectification technology, applied in the field of separation and purification of substances, can solve the problem of DMF toxicity, and achieve the effects of reducing equipment investment, increasing feed temperature, and reducing operating costs.

Active Publication Date: 2016-12-14
烟台国邦化工机械科技有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] DMF is toxic, and the recovery and reuse of the extracted DMF solution is a practical problem

Method used

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  • DMF (N,N-Dimethyl Formamide) rectification dehydration purification method
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  • DMF (N,N-Dimethyl Formamide) rectification dehydration purification method

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Embodiment Construction

[0033] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples cited are only used to explain the present invention and not used to limit the scope of the present invention.

[0034] A DMF distillation dehydration purification method, the method includes the following steps:

[0035] (1) Blow nitrogen to replace air into the rectification tower 1, and then the raw materials enter the heat exchanger 5, exchange heat with the solvent extracted from the bottom of the rectification tower 1, and then feed from the middle of the rectification tower 1;

[0036] (2) The material falling into the bottom of the rectification tower 1 is heated by the reboiler 4 and rises to the top of the tower. The vapor at the top of the tower is condensed into liquid by the condenser 3 connected to the vacuuming device and enters the multifunctional tank 2;

[0037] (3) After passing through the phase separation in the multifunction...

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Abstract

The invention discloses a DMF (N,N-Dimethyl Formamide) rectification dehydration purification method which is characterized by comprising the following steps: (1) feeding raw materials into a heat exchanger, performing heat exchange with a solvent obtained from the bottom of a rectifying column, and feeding the materials from the middle part of the rectifying column; (2) heating the materials falling into the bottom of the rectifying column, raising the materials to the top of the rectifying column, condensing the materials into a liquid by using a steam condenser at the top of the rectifying column, and feeding the liquid into a multifunctional tank; (3) performing phase splitting in the multifunctional tank, backflowing one part of water phase to the top of the rectifying column, and discharging one part of the water phase to a wastewater treatment section; (4) discharging a solvent at the bottom of the rectifying column, performing heat exchange with the raw materials, and discharging to an outside battery limit product storage tank. The DMF rectification dehydration purification method is energy-saving, low in cost and relatively good in practicability.

Description

Technical field [0001] The invention relates to a DMF rectification dehydration purification method, which belongs to the field of substance separation and purification. Background technique [0002] DMF (N,N-Dimethylformamide) is a transparent liquid, which is miscible with water and most organic solvents. It is a very good aprotic polar solvent. Used as a selective solvent extractant, DMF can be used in extraction processes in many fields such as petroleum processing. For example: in the refining process of lubricating oil raw materials, DMF can effectively extract and separate non-paraffins from paraffins; in isophthalic acid and terephthalic acid, which have similar properties and are difficult to separate Among them, it can be separated easily by DMF solvent extraction or stepwise recrystallization; DMF can also extract cyanuric acid from crude amide containing urea, biuret and cyanuric acid. In addition, DMF can also be used to extract and separate acids from petroleum fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C231/24C07C233/03B01D3/14
CPCB01D3/14C07C231/24C07C233/03Y02P20/10
Inventor 张春灵于秀刚李小刚李晓宁杨国举毛学峰
Owner 烟台国邦化工机械科技有限公司
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