Method for preparing electronic-grade N, N-dimethylformamide by ion exchange resin method

A technology of dimethylformamide and ion exchange resin, which is applied in the field of purification technology, can solve the problems of affecting, affecting the adjustment of polymerization reaction speed, and not considering the problem of metal ion removal.
CN101993386AInactive Publication Date: 2011-03-30TIANJIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(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 method for preparing electronic-grade N, N-dimethylformamide by an ion exchange resin method, which comprises the steps of: pumping industrial-grade N, N-dimethylformamide into a heat exchanger; reducing the temperature of raw material to room temperature of 40 DEG C; entering an ion exchange unit; removing metal ions, formic acid, dimethylamine and salt impurities generated by the formic acid and the dimethylamine from the N, N-dimethylformamide by an ion exchange method; and filtering broken resin and granular impurities in the N, N-dimethylformamide by a filtering unit to obtain the electronic-grade N, N-dimethylformamide. In the prepared electronic-grade N, N-dimethylformamide DMF, the content of each metal ion is less than 10 ppb; the content of methylamine and the content of the formic acid are reduced to be less than 1 ppm; the pH value of DMF is 7.0 approximately; the conductance of pure DMF is less than 0.010 microsecond / cm; a purified DMF is used as a high-end product for electronics industry of manufacturing copper-clad plates and high-grade pulp industry of polyurethane synthetic leather.
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Description

technical field

[0001] The present invention relates to a method for preparing electronic grade N,N-dimethylformamide products by removing impurities such as methylamine, formic acid and metal ions in industrial-grade N,N-dimethylformamide (DMF), belongs to the purification technology. Background technique

[0002] N, N-dimethylformamide (abbreviated as DMF) is a colorless, transparent liquid with strong polarity and low toxicity, and is a good organic solvent. It is mainly used in industries such as polyurethane slurry, electronics, pharmaceutical intermediates and polypropylene acrylic spinning.

[0003] There are many ways to produce N, N-dimethylformamide. At present, most of the industrial methods are one-step synthesis of carbon monoxide and dimethylamine. After the synthesis, the crude product passes through a low-boiling tower and a high-boiling tower to remove light components in the product. and heavy components, and then through a stripping tower, using inert ga...

Claims

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