Chengdu Yizhi Technology: the development path of ionic liquid desulfurization process technology 

With the development of industrialization, environmental protection is receiving more and more attention. Among many industrial exhaust gases, sulfur dioxide is a common and harmful gas, and its emissions pose a serious threat to the environment and human health. To solve this problem, Chengdu Yizhi Technology Co., Ltd. pioneered and named ionic liquid desulfurization process technology, which has achieved remarkable results in the field of industrial gas purification due to its high efficiency and environmental protection.

The Birth and Early Development of Ionic Liquid Desulfurization Technology

In traditional sulfur dioxide desulfurization technology, limestone, ammonia, etc. are usually used as absorbents to achieve the purpose of desulfurization by chemical reaction with sulfide. However, these traditional technologies have problems such as high absorbent consumption, severe equipment corrosion, and secondary environmental pollution. To overcome these problems, Yizhi Technology engineers began searching for new desulfurization technologies and eventually succeeded in developing ionic liquid desulfurization technology.

Ionic liquids (organic amines) are substances that are liquid at room temperature. They have low vapor pressure, good thermal stability, are non-hazardous and have low or no toxicity. Ionic liquid desulfurization technology is an innovative solution proposed by Yizhi Technology after in-depth research in the field of flue gas desulfurization. The technology uses the properties of ionic liquid to effectively absorb and utilize sulfur dioxide. Along with efficient desulfurization, the technology allows the recovery of sulfur dioxide with a purity of up to 99.5%, which can be used to produce chemical products such as sulfuric acid, liquid SO2 or sulfur, thus realizing the resource use of sulfur pollutants, which not only solves the problem of environmental pollution, but also brings economic benefits to the enterprise.

Ionic liquid desulfurization technology has been making important breakthroughs since its evaluation in 2007. 2008, Yizhi Technology will develop organic solution cycle absorption desulfurization technology, officially named "Ionic Liquid Desulfurization Technology", and the first set of devices in Bayan Nur Zijin Non-ferrous Metals Company Limited successful industrial application. This achievement marks the transition of ionic liquid desulfurization technology from laboratory research to industrial application.

Secondly, the technology of ion-liquid desulfurization is constantly being improved and updated.

In the process of applying ionic liquid desulfurization technology, Yizhi Technology always adheres to the spirit of innovation and constantly promotes the upgrading and improvement of technology. The company has created several important milestones in ionic liquid desulfurization technology:

1. In 2010, ionic liquid desulfurization technology received the "First Prize of Science and Technology of the China Non-ferrous Metallurgy Association" and the "First Prize of Science and Technology of the Sichuan Environmental Protection Service". In the same year, one large-scale ionic liquid desulfurization plant was successfully launched in China, the production capacity of which reached 1.2 million Nm3/h, which once again confirmed the feasibility and high efficiency of ionic liquid desulfurization technology.

2.In 2011, the organic amine desulfurizer in CANSOLV plant was successfully replaced with ionic liquid desulfurizer, which is an innovative initiative that opens up a wider scope for the application of ionic liquid desulfurization technology.

3.In 2013, Yizhi Technology again made a significant breakthrough by successfully refurbishing the CANSOLV desulfurization plant in China, which further expanded the application scope and market share of ionic liquid desulfurization technology.

4.In 2014, ionic liquid desulfurization technology successfully entered the petrochemical industry for CNOOC Huizhou Refining Krause tail gas purification. This application case fully demonstrated the wide applicability of ionic liquid desulfurization technology in various industrial applications.

5.In 2015, Yizhi Technology once again defied technical limitations and successfully applied ion liquid desulfurization (ILDS) technology to treat 7% flue gas with high SO2 concentration. This achievement once again proves the high efficiency and stability of ionic liquid desulfurization technology.

Third, the technical characteristics and advantages of ionic liquid desulfurization technology

Ionic liquid desulfurization technology can stand out among many desulfurization technologies due to its technical characteristics and advantages:

1. Desulfurizer recycling: ionic liquid can be recycled, small consumption, reducing pollutant emissions and resource waste.

2.High desulfurization efficiency: sulfur dioxide removal rate ≥ 99.5%, sulfur content in clean desulfurization flue gas is no more than 50 mg/Nm³, which meets strict environmental requirements.

3.Resource utilization: Sulfur dioxide gas with extracted purity ≥99.5% can be used to produce sulfuric acid, sulfur or liquid sulfur dioxide and other chemical products, which realizes the resource utilization of sulfur pollutants.

4.Advanced technology: high degree of automation, long-term stable operation, easy to start and stop, low commissioning and maintenance costs, reducing enterprise operating costs.

5.Wide range of adaptability: When flue gas sulfur content is high, the investment and operating costs of this technology are more favorable, and it is applicable to various flue gas treatment scenarios.

6.Less emission of three wastes: less emission of exhaust gas, waste water, solid waste, in the field of desulfurization there is a significant advantage, which can greatly reduce enterprise environmental protection investment and environmental protection operating costs.