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1. It is obtained by separation of C9 aromatic hydrocarbons.
2. About 11.8% of mesitylene in reforming heavy aromatics. However, since its boiling point (164.7 ° C) is very similar to the boiling point of o-methylethylbenzene (165.15 ° C), it is difficult to separate by distillation.
3. Isomerization method using meta-trimethylbenzene as raw material, the single-pass yield of 1,3,5-trimethylbenzene obtained by fractional distillation is 21.6%, the purity is over 95%, and the by-product has 4%-7% of the average Toluene and 9% xylene. The average temperature of the reactor bed is 260 ° C, the pressure is 2.35 MPa, the air is 1.0 h-1, the molar ratio of reforming hydrogen to oil is 10:1, and the catalyst is aluminum-deficient mordenite: copper: nickel: binder = 85.2: 0.5:15. Under these conditions, the conversion of meta-trimethylbenzene was 46%, the selectivity was 47%, and the yield per pass of toluene was 21.6%. Japan's Mitsubishi Gas Company uses HF-BF3 for xylene separation and isomerization, and the by-product contains high-concentration 1,3,5-trimethylbenzene high-boiling substances, which can be obtained by distillation.
4. The acetone is dehydrated under sulfuric acid catalysis to obtain the product in a yield of 13%-15%. 4600 g (79 mol) of industrial acetone was cooled to 0-5 ° C, and 4160 ml of concentrated sulfuric acid was added under stirring at a temperature not exceeding 10 °C. After the addition, the mixture was stirred for 3-4 h and left at room temperature for 18-24 h. The product is subjected to steam distillation, and 1,3,5-trimethylbenzene is separated, and then alkali washing, water washing, distillation and collecting 210 ° C fraction, adding 15 g of sodium metal to the fraction, heating to near boiling point, and distilling off 2/3 The liquid was distilled to 210 ° C, and the fraction of 163-167 ° C was collected by high-efficiency fractionation to obtain 430-470 g of 1,3,5-trimethylbenzene.
5. Separated from coal tar and crude petroleum products.