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Successful pilot test of continuous semi-coke method for producing carbon disulfide / Author/Source: Sinochem News Network / Date: 12-06-2019 / Clicks: 2. On December 2, reporters learned from relevant departments in Shangrao City, Jiangxi Province, that the electric-heating continuous semi-coke sulfur method for producing carbon disulfide, developed by Shanxi Yifang Chemical Technology Co., Ltd., has been successfully tested on a pilot scale in the Yushan Industrial Park of Shangrao City, with the industrialization process also progressing in an orderly manner. It is reported that the 3,000-ton/year electric-heated continuous semi-coke sulfur method carbon disulfide pilot production facility, built in the chemical industry zone of the western industrial park in Yushan County through joint investment by Yushan Baoding Industrial Co., Ltd. and Ruichang Hengxin Chemical Co., Ltd., using Yi Fang Chemical’s production technology, was put into trial operation in September 2018. After more than 8 months of continuous operation, all the process parameters of this device have met the design requirements. On April 7, the device passed the technical certification organized by units such as the Shangrao Municipal Industry and Information Technology Bureau and the Jiujiang Municipal Industry and Information Technology Bureau. Experts believe that the process of this pilot plant ensures continuity, provides a foundation for automated control, the product quality meets **standards, energy consumption is within acceptable limits, and appropriate measures are in place to handle pollutants; as a result, exhaust gases can be recycled within the production process. The expert technical evaluation indicates that this pilot-scale plant uses semi-coke and sulfur as raw materials to produce carbon disulfide via an electrically heated continuous process. In this process, sulfur is melted and vaporized in a sulfur melting tank using electric heating, while semi-coke is fed into the system in a mechanical and sealed manner. A gas-solid reaction takes place in an electrically heated reactor, resulting in the formation of gaseous carbon disulfide. The gaseous carbon disulfide has its heat recovered through heat exchange, and any unreacted sulfur is removed using a desulfurizer; this sulfur is then returned to the sulfur melting tank. The gaseous carbon disulfide is further condensed to yield crude liquid carbon disulfide, which is then refined to produce finished liquid carbon disulfide, with the resulting sulfur being sent back to the sulfur melting tank. Li Huaiyi explained that the original carbon disulfide production process used coal-fired heating for intermittent production, while the new process employs electric heating for continuous production, which is more environmentally friendly and easier to control as well as automate. Furthermore, the exhaust gas treatment in this process employs a combination of solvent absorption for carbon disulfide and combustion conversion in a Claus furnace, thereby avoiding the disadvantages of the batch coke method which relies on coke as a raw material and is facing phased out, as well as the high investment costs associated with the natural gas method.