2,6-dimethylphenol composition
A technology of dimethylphenol and composition, applied in the preparation, organic chemistry, transportation and packaging of organic compounds, etc., can solve the problems of different impurity content, unable to control polymerization activity or molecular weight distribution as desired, etc.
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Embodiment 1
[0072] In a 50L jacketed reactor, the bottom is equipped with a distributor for introducing oxygen-containing gas, a stirring turbine and a baffle, and in the exhaust line at the upper part of the reactor, a reflux condenser with a drier is used to separate the adhering to the reflux condenser To the condensate at the bottom, add 3.3497g of cuprous oxide, 20.1484g of 47% aqueous hydrogen bromide, 39.0655g of di-n-butylamine, 99.0826g of dimethyl-n-butylamine, 8.0692g of N,N'-di tert-butylethylenediamine, 2.000 g of trioctylmethylammonium chloride, and 14730.3 g of toluene to prepare an initial stock solution. Under vigorous stirring, air was introduced from the sparger at a rate of 28 L / min. Simultaneously, start adding 2600 g of monomer solution into 2498.0 g of toluene by means of a plunger pump at a rate of 30 minutes to complete the feed. It was obtained by adjusting the content of m-cresol to 20 ppm. The polymerization temperature was maintained at 40°C by introducing a...
Embodiment 2
[0074] The reaction was performed in the same manner as in Example 1, except that the refined 2,6-dimethylphenol was adjusted to contain 80 ppm of m-cresol. The time and color index required for polyphenylene ether are also listed in Table 1.
Embodiment 3
[0076] The reaction was performed in the same manner as in Example 1, except that the refined 2,6-dimethylphenol was adjusted to contain 350 ppm of m-cresol. The time and color index required for polyphenylene ether are also listed in Table 1.
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