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Preparation
The Inconel tubular reactor with an inner diameter of 10mm was filled with chromium fluorination catalysts containing Zn, Sb, Ni and Al (the mass ratio of Cr(OH)3, Zn, Sb, Ni and Al in chromium fluorination catalysts was 50 ~ 60:5 ~ 25:1 ~ 5:1 ~ 5:5 ~ 15). Before toluene enters the mixing tank, it is preheated at 80℃. Toluene and hydrogen fluoride were respectively controlled by peristaltic pump, and chlorine gas was controlled by gas flowmeter, and added to the raw material mixing tank at 250℃. Chlorine gas: hydrogen fluoride: toluene = 12:12: 1(molar ratio), the gasification of toluene, hydrogen fluoride and chlorine gas into a mixed gas into the reactor, the reaction temperature is 450℃, space speed is 0.5h-1, after a reaction, the conversion of toluene is 5.09%, and the selectivity of perfluorinated toluene and some fluorinated chlorinated intermediates in the product is 97.23%. After 20h, the conversion rate of toluene reached 50.01%, the selectivity of perfluorinated toluene and partially fluorinated chlorinated intermediates was 96.34%, and the content of octafluorotoluene was 10.23%.
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CN201710144620.6 discloses a production and preparation method of graphene with high purity and stable performance, including raw materials with the following weight ratio: Potassium hydroxide 4-8 parts, expanded graphite 50-70 parts, threonine 10-14 parts, dioxane 1-3 parts, concentrated sulfuric acid 12-18 parts, concentrated nitric acid 21-25 parts, diethylhydroxylamine 3-5 parts, vinyl distearamide 11-13 parts, N-methylformamide 3-5 parts, tetramethylammonium bicarbonate 19-21 parts, 1-butyl-3-methylimidazole Di-trifluoromethanesulfonimide salt 1-3 parts, octafluorotoluene 0.1-0.3 parts, calcium hypochlorite 5-7 parts, hydrazine hydrate 1-5 parts, naphthalene tetracarboxylic dianhydride 12-16 parts; The production and preparation method of graphene with high purity and stable performance can produce graphene with high purity and stable performance.
