Purifying method for electronic-grade N,N-dimethylformamide

A dimethylformamide, electronic-grade technology, applied in the field of N, can solve problems such as not being seen, complex resin pretreatment and regeneration process, and increased post-processing burden
CN101993387AInactive Publication Date: 2011-03-30TIANJIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
TIANJIN UNIV
Publication Date
2011-03-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a purifying method for electronic-grade N,N-dimethylformamide, which is characterized in that the industrial-grade dimethylformamide (DMF) is decompressed and rectified; the material of a decompressing and rectifying tower is stainless steel; the operating pressure is between 8.7 and 27.2 kPa; the operating temperature is from 80 to 110 DEG C; the formic acid with low boiling point, the water and the dimethylamine impurities in the DMF are eliminated from the top of the tower; the DMF from the bottom of the rectifying tower enters a continuous electric deionizing device; and the metal ions, the formic acid, the organic amine and the salt impurities generated by the formic acid and the organic amine in the N,N-dimethylformamide are eliminated by utilizing ion exchange resins and the coupling technique of electrodialysis under an electric field. The invention provides a producing process with the advantages of good purification effect and low energy consumption, and the continuous production purity reaches the purity requirements of electronic chemicals. Thus, the content of the impurity metal ions in the DMF product is lower than 10ppb, the content of the dimethylamine, the formic acid and the electrolyte impurity capable of being ionized is lower than 0.5ppm, the electric conductance of the product DMF is less than 0.010 mu second / cm, and the obtained DMF product can be used for the electronic industries of copper-clad plates and the like.
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Description

technical field

[0001] The invention relates to the technical field of purification, in particular to a method for purifying electronic-grade N,N-dimethylformamide. Background technique

[0002] N, N-dimethylformamide, its English name is N, N-dimethyl formamide (abbreviated as DMF), structural formula: HCON (CH 3 ) 2 , it is a colorless, transparent liquid with little toxicity and a slight ammonia smell. DMF has strong polarity and is a good organic solvent. It is mainly used in the industries of polyurethane, acrylic, electronics, pharmaceutical intermediates, and pesticides. In the electronics industry, it is used as a solvent in the production process of copper-clad laminates, a quenching agent for tin-plated parts, a cleaning agent for circuit boards, and an electrolyte for electrochemical synthesis.

[0003] N, the production method of N-dimethylformamide has multiple, commercial majority is carbon monoxide and dimethylamine one-step synthetic method at present, and...

Claims

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