Application of ionic liquid used as solvent in benzene and cyclohexane extraction, rectification and separation

An ionic liquid solvent and ionic liquid technology, which is applied in distillation purification/separation, organic chemistry, bulk chemical production, etc., can solve the problems of complex separation process, equipment investment and high energy consumption of separation, and achieve high chemical stability and wide Effect of liquid temperature range, process and operational simplification
CN101265152BInactive Publication Date: 2013-06-05CHINA UNIV OF PETROLEUM (BEIJING)
0 Cites 2 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (BEIJING)
Publication Date
2013-06-05
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses the application of ionic liquid which is used as a solvent for separating benzene and cyclohexane by extractive distillation, and relates to the application that the ionic liquid is used as the solvent during the process of separating the benzene and the cyclohexane by extractive distillation. Cationic in the ionic liquid is imidazole cationic, anion in the ionic liquid isfluorophoshoric acid anion or halide anion, and ionic liquid solvent is one ionic liquid or two or more than two compounded ionic liquid; the water content of the ionic liquid is 0 percent to 20 percent, and the addition amount ranges in the molar concentration from 5 percent to 90 percent; light-component cyclohexane with low boiling point is obtained at the top of a rectification column and themixture of the ionic liquid and the benzene is obtained in a column reactor during the separating process; the mixture passes through an evaporator or is performed through steam stripping separation.The extractive distillation technology of the ionic liquid solvent increases the separation precision, and obviously simplifies process flow agents, reduces equipment investment and lowers the separation energy consumption at the same time, thereby getting very remarkable economic benefits.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the application of an ionic liquid, in particular to the application of an ionic liquid as a solvent in the process of separating benzene and cyclohexane by extraction and rectification. Background technique

[0002] In the petroleum processing industry, benzene and cyclohexane have similar boiling points (benzene is 80.1°C and cyclohexane is 80.74°C), and their relative volatility is close to 1, so it is difficult to separate them by ordinary rectification. The number of theoretical plates is large, or a large reflux ratio is required, and the operating cost is much higher than the separation of the general system.

[0003] Table 1 lists the approximate number of theoretical plates required to separate systems with different relative volatilities by ordinary distillation under certain separation requirements. It can be seen that the greater the relative volatility of the system, the easier it is to separate. If the relative v...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More