Method for purifying carbon disulfide with dividing wall column

A technology of carbon disulfide and the next-door tower, which is applied in the direction of carbon disulfide and carbon sulfur compounds, can solve the problems of additional energy consumption, residual, high energy consumption, etc., to reduce equipment investment and energy consumption, reduce device energy consumption, and reduce land occupation area effect

Active Publication Date: 2019-03-22
SHANDONG XINHECHENG AMINO ACID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbon disulfide contains a small amount of dissolved hydrogen sulfide and sulfur. Since hydrogen sulfide is dissolved in carbon disulfide, pure carbon disulfide cannot be obtained by simple evaporation and distillation methods, and must be rectified.
[0008] To sum up, there are generally two ways to obtain pure carbon disulfide at present, using organic solvents or adopting rectification methods, organic solvents may remain, and the rectification process consumes a lot of energy, mainly for the input heat of the reboiler The use efficiency is low, most of the energy input by the reboiler is transferred to the condensing agent of the overhead condenser, and the part that actually provides effective energy to the stream is very little
At present, the rectification process of carbon disulfide needs to go through three towers, the absorption tower, the analysis tower, and the refining tower. After passing through the three towers, most of the heat provided by the public works is consumed by the condensing agent, and the final energy consumption is added to the target product. is not advisable

Method used

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  • Method for purifying carbon disulfide with dividing wall column

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Include the following steps:

[0047] (1) Incoming raw materials

[0048] Carbon disulfide synthesizer output including CS 2 47%, S 3%, H 2 S 50% (mass ratio) of carbon disulfide crude product 1 is sent to the dividing wall column at a feed rate of 6250kg / h; the raw material is sent into the feed port E, and the feed port E is opened on the sixth tray of the pre-separation zone A On, feed temperature 30°C, pressure 6bar.

[0049] Described next door tower, main tower has 30 trays, public rectification section C has 10 trays, public stripping section D has 12 trays, tower middle section has 8 trays, dividing plate H divides tower middle section It is divided into pre-separation area A and pure product area B, and the cross-sectional area ratio of pre-separation area A and pure product area B is 0.5:1.

[0050] (2) Separation in the next wall tower

[0051] Steam is fed into the bottom of the tower, the temperature at the bottom of the tower is 100°C, the pressure is...

Embodiment 2

[0053] (1) Incoming raw materials

[0054] Carbon disulfide synthesizer output including CS2 69%, S 1%, H 2 S 30% (mass ratio) carbon disulfide crude product 1 is sent into the dividing wall column at a speed of 6250kg / h; the raw material is sent in from the feed port E, and the feed port E is opened on the 8th tray of the pre-separation zone A, Feed temperature 180°C, pressure 10bar;

[0055] Described next door tower, main tower has 40 trays, public rectification section C has 16 trays, common stripping section D has 12 trays, tower middle section has 12 trays, dividing plate H divides tower middle section It is divided into pre-separation area A and pure product area B, and the cross-sectional area ratio of pre-separation area A and pure product area B is 1.5:1.

[0056] (2) Separation in the next wall tower

[0057] Steam is fed into the bottom of the tower, the temperature at the bottom of the tower is 140°C, the pressure is 10bar, the discharge from the bottom of the ...

Embodiment 3

[0059] (1) Incoming raw materials

[0060] Carbon disulfide synthesizer output including CS 2 58%, S 2%, H 2 The carbon disulfide crude product 1 of S 40% (mass ratio) is sent into the dividing wall column at a speed of 6250kg / h; the raw material is sent into the feed port E, and the feed port E is opened on the fourth tray of the pre-separation zone A, Feed temperature 100°C, pressure 8bar;

[0061] Described next door tower, main tower has 20 trays, public rectification section C has 8 trays, public stripping section D has 6 trays, tower middle section has 6 trays, dividing plate H divides tower middle section It is divided into pre-separation area A and pure product area B, and the cross-sectional area ratio of pre-separation area A and pure product area B is 2:1.

[0062] (2) Separation in the next wall tower

[0063] Steam is fed into the bottom of the tower, the temperature at the bottom of the tower is 120°C, the pressure is 8bar, the discharge from the bottom of th...

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Abstract

The invention provides a method for purifying carbon disulfide with a dividing wall column. The method comprises the following steps: feeding raw materials and performing separation in the dividing wall column. The dividing wall column comprises a public rectifying section, a separation section and a public stripping section; the separation section comprises a pre-separation zone, a separation plate and a pure product zone; the separation plate is located between the pre-separation zone and the pure product zone; the specific value of the cross sectional areas of the pre-separation zone and the pure product zone is (0.5-2):1. In the method, the carbon disulfide is purified by one column, one reboiler and a condenser. The equipment investment and energy consumption can be effectively reduced, and the covering area is reduced; with adoption of the method of the patent, a carbon disulfide product with the purity being near 100% is obtained. With adoption of the method of the patent, the energy consumption of a device is reduced by 45.6%.

Description

technical field [0001] The invention belongs to the field of separation of chemical intermediates, and relates to a separation and purification process of carbon disulfide, in particular to a method for purifying carbon disulfide by using a rectifying column next to the wall. Background technique [0002] Carbon disulfide participates in the sulfonation reaction and side reactions as the main reaction substance, and the production process has high requirements on the purity of carbon disulfide. Carbon disulfide contains a small amount of dissolved hydrogen sulfide and sulfur. Since hydrogen sulfide is dissolved in carbon disulfide, pure carbon disulfide cannot be obtained by simple evaporation and distillation methods, and rectification must be carried out. Rectification is the distillation of crude carbon disulfide, the generated carbon disulfide and hydrogen sulfide vapor interact with the condensed and refluxed liquid carbon disulfide in the rectification tower to separat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/72
CPCC01B32/72
Inventor 王志轩陈聪魏术海车荣峰
Owner SHANDONG XINHECHENG AMINO ACID
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