Method for purifying carbon disulfide with dividing wall column

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...

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

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