Method for manufacturing hexane solvent oil

Abstract

The invention relates to a manufacturing method for hexane solvent oil, which is a method for obtaining high-purity product in petrochemical industry through the means of extraction and separation; the invention discloses that the No.6 solvent oil of the distillation in the boiling spread of 60 DEG C to 90 DEG C is taken as the raw material, after being distilled in a rectifying tower, the distillate oil of 68 DEG C to 70 DEG C can be collected from a sidetrack of the tower, the generative production is the pure hexane solvent oil with the content of 95 percent. The distillation is implementedat the rectifying tower with the ratio of height to diameter of 45:1; the element inside the rectifying tower adopt a fluted gas-liquid distribution; a column plate is implemented by adopting a rectifying tower with regular filling of silk screen; finally the assured operating conditions are that: the feed line speed of No.6 solvent oil is 0.81m per second; the temperature of the top of the rectifying tower is 60 DEG C to 66 DEG C; the temperature of the bottom of the rectifying tower is 80 DEG C to 85 DEG C; the temperature of the sidetrack is 68 DEG C to 71 DEG C; the reflux temperature ofthe top of the rectifying tower is 45 DEG C to 50 DEG C; the reflux ratio of the top of the rectifying tower is 60 to 65 and the operating pressure of the rectifying tower is in a absolute pressure of0.105MPa. The invention adopts a single rectifying tower to produce continuously, and has the advantages of the production purity of over 95 percent, lower energy consumption, high efficiency, low investment, less area occupation and simple operation and management.

Description

technical field [0001] The present invention relates to a manufacturing method of petrochemical industry, more precisely, it is a manufacturing method for obtaining high-purity products by means of extraction and separation, and adopts a single-tower process to obtain single-component n-hexane distillates with a content of more than 95% in one pass . Background technique [0002] High-purity n-hexane is used as a polymerization solvent for organic synthesis, paint thinner and chemical production processes, such as polyethylene, polypropylene and other polymerization processes must use hexane as a protective solvent for polymerization catalysts, but the purity of the solvent is high. The content of n-hexane must be above 95%, and the content of harmful impurities must be strictly controlled. For example, the content of aromatics is required to be below 100PPM, basically no unsaturated hydrocarbons are contained, and the requirements for product quality are strict. [0003] I...

AI Technical Summary

Problems solved by technology

[0003] In order to achieve high-purity n-hexane, it can only be completed by two-tower or three-tower distillation at home and abroad, so the investment is large, the floor area is large, the operation procedure is complicated, the maintenance and management workload is large, and the operation cost is high; at the same time, the content of harmful impurities is required It is also relatively strict, because the polymerization process must strictly control the impurity content of the protective solvent of the polymerization catalyst used, such as unsaturated hydrocarbons, aromatics, etc.

[0004] For example, the Chinese patent ZL200510095440.0, this method produces n-hexane with a purity ≥ 98% at the top of the tower, but two towers must be used