A method and system for separating excess sulfur in the production process of carbon disulfide

Abstract

The invention belongs to the technical field of sulfur separation, and discloses a method and system for separating excess sulfur in the production process of carbon disulfide, which realizes the separation of excess liquid sulfur at high temperature, ensures a low content of carbon disulfide in liquid sulfur, and obtains it through a low-temperature cooling separator. The carbon disulfide with higher sulfur content and the carbon disulfide with a small amount of sulfur produced during the rectification process of carbon disulfide are returned to the high-temperature cooling separator to realize the separation of excess liquid sulfur under high temperature conditions. The present invention not only guarantees the purity of the recovered liquid sulfur, but directly separates the carbon sludge in the liquid sulfur without deep removal of carbon disulfide, and avoids the need for advanced post-treatment or the existence of safety and environmental protection problems in the subsequent liquid sulfur filtration under normal pressure due to the release of carbon disulfide. Moreover, it also ensures the efficient removal of liquid sulfur in carbon disulfide, and ensures the high quality of the product carbon disulfide. At the same time, it makes full use of the energy of the high temperature of the process gas at the outlet of the reactor, and avoids the energy waste of cooling and heating by rectification.

Description

technical field [0001] The invention belongs to the technical field of sulfur separation, and in particular relates to a method and system for separating excess sulfur in the production process of carbon disulfide. Background technique [0002] Carbon disulfide is an important organic solvent, and it can also be used to manufacture pesticides, fungicides, organic pharmaceutical intermediates, etc. [0003] At present, the relatively mature carbon disulfide production technologies in industrialization are divided into two types: methane method and coke method according to the source of raw materials. Due to the production process, the methane method has a high degree of automation, good sealing of the device, continuous operation, and basically no pollution to the environment during normal operation, while the coke method has a low degree of automation due to intermittent operation, serious environmental pollution and greater safety hazards. [0004] Low-carbon hydrocarbons ...

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Problems solved by technology

[0005] After the carbon disulfide reaction is completed, there are few literature studies on the separation of excess sulfur in the feed gas. CN1919732 mentions that the preliminary carbon disulfide separation tower can only ensure that the content of sulfur in the carbon disulfide tower is lower than 1%, and does not mention the content of carbon disulfide in the reclaimed sulfur.

[0009] In the prior art, since the liquid sulfur is not separated at high temperature, the content of carbon disulfide in the liquid sulfur is too high, and the liquid sulfur will be released during the filtration process, which will cause safety and environmental problems; in order to avoid the escape of carbon disulfide from the liquid sulfur, a steam stripping reduce the content of carbon disulfide in liquid sulfur, and send the carbon disulfide after stripping to Claus system or incineration system, which will result in the loss of product carbon disulfide, high consumption of public works, large investment and complicated operation

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