Method for preparing narrow fraction low-aromatic hydrocarbon No.6 solvent oil

Abstract

The invention relates to a method for preparing narrow fraction low-aromatic hydrocarbon No.6 solvent oil, which is characterized in that: active metal nickel is used as a benzene catalytic hydrogenation catalyst and catalytic reforming raffinate oil, which has a distilling range of less than or equal to 140 DEG C, aromatic hydrocarbon content of less than or equal to 1.3 percent and sulfur content of less than or equal to 1ppm, and industrial hydrogen are pumped into a hydrogenation reactor to undergo all-component catalytic hydrogenation under conditions of a hydrogen to oil ratio of 5.5-7.5:100, a liquid benzene space velocity of 0.01 to 1 hour, a temperature of 160 to 175 DEG C, a pressure of 0.3 to 1.5MPa and in the presence of the catalyst for dearomatization and desulfuration; the product of the dearomatization and desulfuration is introduced to a dehydrogenation tower, the temperature of the tower is controlled to be 63 to 102 DEG C and light components with a distilling rangeless than or equal to 60 DEG C are removed; the residual fraction obtained after dehydrogenation is introduced into a heavy component removing tower, the temperature of the tower is controlled to be 72 to 98 DEG C and the heavy components of which the distilling range is more than or equal to 73 DEG C are removed; and the residual fraction (of which the distilling range is 60 to 73 DEG C) in the heavy component removing tower is the required product. The preparation method has the advantages of relatively mild catalyst operation conditions, obvious dearomatization and desulfuration effects, simple and practical process, stable and reliable product quality and high economic efficiency.

Description

Technical field: [0001] The invention relates to a preparation method of No. 6 solvent oil with narrow fraction and low aromatics, belonging to the technical field of petrochemical engineering. Background technique: [0002] my country's No. 6 solvent oil is mainly used as an edible oil extractant, with an annual demand of about 120,000 tons. At present, 30,000 tons of refined solvent oil and 40,000 tons of n-hexane are available in the market as edible oil extractants, and about 50,000 tons of high-end No. 6 solvent oil is still needed. In 2008, the state newly promulgated No. 6 solvent oil -- the standard requirements for plant extraction solvent oil: aromatics (benzene) content ≤ 0.1%, sulfur content ≤ 5ppm, distillation range 61 ~ 76 ℃, in order to improve the edible oil extractant environmental protection. Chinese patent 92102254.9--processing method for comprehensive utilization of condensate oil, introduces a method for preparing narrow fraction (60-71°C) extraction...

AI Technical Summary

Problems solved by technology

In summary, the preparation methods or processes for extracting solvent oils involved in the prior art still cannot make the extraction solvent oils meet the requirements of the newly promulgated plant regulations in 2008 in terms of distillation range and sulfur content. According to the standard requirements of extraction solvent oil, it is still necessary to research and develop new preparation methods or processes to meet the application needs of plant extraction solvent oil and solve the problem of a large number of high-end plant extraction solvent oils in China.