Serial trimethyl benzene separating apparatus and method

A separation device and separation method technology, applied in distillation purification/separation, fractionation, organic chemistry and other directions, can solve the problems of high energy consumption, difficult separation, high investment and operating costs, and achieve the effect of reducing unit energy consumption

Inactive Publication Date: 2007-06-06
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The three-tower process is adopted under normal pressure, which consumes a lot of energy and affects economic benefits
This is because each component of the C9 aromatics in the feed is a series of isomers, and the difference in boiling point between each other is small. The difference between the boiling points of mesitylene and o-methylethylbenzene is 4.2°C, and the difference between the boiling points of mesitylene and o-methylethylbenzene is 0.5°C. The separation is difficult and requires a large number of theoretical plates in each column, so the investment and operating costs of the device are relatively high

Method used

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  • Serial trimethyl benzene separating apparatus and method
  • Serial trimethyl benzene separating apparatus and method

Examples

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Effect test

Embodiment 1

[0021] The pre-separation tower, the mesitylene tower and the partial toluene tower all use metal mesh corrugated packing. The thermal coupling process is to realize thermal coupling between the pre-separation tower and the mesitylene tower and the partial toluene tower, as shown in Figure 2. The C9 aromatic hydrocarbon raw material 4 enters the pre-separation tower 1 after heat exchange by the heat exchanger 5, and the pre-separation tower is operated at 30KPa, and the temperature at the top of the tower is controlled at 100°C. The top of the tower is connected to a vacuum device 8, and the gas phase at the top of the tower passes through a condenser 6 Then enter the reflux tank 7, wherein the condensate is partly refluxed, partly as light solvent oil A out of bounds. The pressure of the mesitylene tower is controlled at 100KPa, and the temperature at the top of the tower is controlled above 150°C, so that the gas phase at the top of the tower is used as the heat source of th...

Embodiment 2

[0023] The pre-separation tower, the mesitylene tower and the partial toluene tower all use metal mesh corrugated packing. The thermal coupling process is to realize thermal coupling between the pre-separation tower and the mesitylene tower and the partial toluene tower, as shown in Figure 2. The C9 aromatic hydrocarbon raw material 4 enters the pre-separation tower 1 after heat exchange by the heat exchanger 5. The pre-separation tower is operated at 50KPa, and the temperature at the top of the tower is controlled at 130°C. The top of the tower is connected to a vacuum device 8, and the gas phase at the top of the tower passes through a condenser 6 Then enter the reflux tank 7, wherein the condensate is partly refluxed, partly as light solvent oil A out of bounds. The pressure of the mesitylene tower is controlled at 120KPa, and the temperature at the top of the tower is controlled at about 170°C, so that the gas phase at the top of the tower is used as the heat source of the...

Embodiment 3

[0025] The pre-separation tower, the mesitylene tower and the partial toluene tower all use metal mesh corrugated packing. The thermal coupling process is to realize thermal coupling between the pre-separation tower and the mesitylene tower and the partial toluene tower, as shown in Figure 2. The C9 aromatic hydrocarbon raw material 4 enters the pre-separation tower 1 after heat exchange by the heat exchanger 5, and the pre-separation tower is operated at 80KPa, and the temperature at the top of the tower is controlled at 160°C. The top of the tower is connected to a vacuum device 8, and the gas phase at the top of the tower passes through a condenser 6 Then enter the reflux tank 7, wherein the condensate is partly refluxed, partly as light solvent oil A out of bounds. The pressure of the mesitylene tower is controlled at 160KPa, and the temperature at the top of the tower is controlled at 185°C, so that the gas phase at the top of the tower is used as the heat source of the r...

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Abstract

The present invention relates to serial trimethyl benzene separating apparatus and method. The serial trimethyl benzene separating apparatus includes a pre-separating tower, a sym-trimethyl benzene tower and an unsym-trimethyl benzene tower, and features the condensator on the pre-separating tower connected to the outlet of the pre-separating tower, the reflux accumulator connected to the condensator and one vacuum unit, the reboiler in the bottom of the pre-separating tower connected between the outlet and the inlet of the sym-trimethyl benzene tower. The present invention adopts a serial three-tower process, can produce unsym-trimethyl benzene in purity over 99 % and sym-trimethyl benzene in purity over 35 % simultaneously in the yield over 90 % and power consumption 30 %-40 % lower than one normal pressure process.

Description

technical field [0001] The invention relates to the field of fine chemical separation technology, in particular to a trimethylbenzene serial separation device and method. Background technique [0002] Trimethylbenzene and other carbon nine-fold aromatics are mainly derived from refinery reforming units, among which metatrimethylbenzene and mesitylene are important fine chemical products with high added value. Among them, trimethylene is widely used as a basic organic chemical raw material, mainly used for isomerization to produce mesitylene and synthesis of trimellitic anhydride. Using enriched mesitylene as raw material to carry out catalytic alkylation reaction, high-purity mesitylene can be obtained, and mesitylene can be used to produce mesitylene, and can also be used as a dye intermediate. [0003] Most of the domestic trimethylbenzene separation processes adopt an atmospheric pressure double-tower process, which only produces mesitylene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/04C07C15/02B01D3/14
Inventor 黄国强李鑫钢姜斌辛江
Owner TIANJIN UNIV
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