Method for preparing high-purity isohexane solvent oil

Abstract

The invention relates to a method for preparing high-purity isohexane solvent oil. The method comprises the following steps: carrying out hydrofining on reformed raffinate oil, and adopting a nickel catalyst, wherein the process conditions are as follows: the pressure is 0.2-2.0Mpa; the temperature is 80-220 DEG C; the air velocity is 2.0-4.0h<-1>; and the hydrogen oil ratio is 40-200v / v; cutting off the fraction over 65 DEG C from the hydrofined reformed raffinate oil on a true boiling point distillation apparatus; repeating the steps and collecting the fraction which is not greater than 65 DEG C for three times; cutting the collected fraction which is not greater than 65 DEG C on the true boiling point distillation apparatus again; and collecting products of different temperature segments of tower distillate products by a plurality of small bottles, wherein 0.5 DEG C is taken as a distillation segment, thus obtaining the isohexane product of which the purity is 95.323% between 59.5 DEG C and 62 DEG C. By adopting the method, the reformed raffinate oil is taken as a raw material, aromatic hydrocarbon and olefins are removed by adopting a high-activity nickel catalyst in a hydrofining manner, and the isohexane product of which the purity is not smaller than 95% is obtained on the true boiling point distillation apparatus by cutting and fractionation twice.

Description

technical field [0001] The invention relates to a preparation method of high-purity isohexane solvent oil, which is a preparation method for obtaining high-purity products through refining and separation means. Background technique [0002] Along with the rapid growth of the country's economy, the demand for various hydrocarbon solvent products continues to increase, and people's awareness of health and environmental protection has deepened, so that various industries have put forward stricter requirements for the quality of hydrocarbon solvents. Therefore, from In terms of output and quality, hydrocarbon solvents have a huge market space and development space in my country. The market demand for solvent oils has developed from ordinary solvent oils to special solvent oils. N- / isoparaffin solvent oil is gradually favored by the market because of its good solubility, high safety, low toxicity, suitable volatility, and the feasibility of replacing other solvent oil products in v...

AI Technical Summary

Problems solved by technology

At present, isohexane is produced by some refineries in China, such as Lanzhou, Liaoyang, Dalian, Yanshan, and Yangzi. The output is mostly within 10,000 tons per year, and it is sold to all parts of the country on the basis of meeting the consumption of the factory. The sales are good. Due to the low output of isohexane and the large market demand, the price has been on the rise in recent years. In August 2012, the price of isohexane required to have a purity of 95% was about 12,000 yuan / ton. Isohexane is currently out of stock in my country. Relying on imports, only Guangzhou Help Chemical Co., Ltd. in my country can provide a large amount of isohexane in a stable manner. There are isohexane products of different purity for sale in coastal economically developed cities and Liaoyang in Northeast China, but most of them only sell but not produce, and supply The amount is not large

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