Chengdu Yizhi Technology: Ionic Liquid Desulphurisation Process Technology Advancement Road

With the advancement of industrialisation, environmental protection is receiving more and more attention. Among many industrial exhaust gases, sulphur dioxide is a common and harmful gas, and its emission poses a serious threat to the environment and human health. In order to solve this problem, Chengdu Yizhi Technology Co., Ltd. pioneered and named the ionic liquid desulfurisation process technology, which has achieved remarkable results in the field of industrial gas purification with its high efficiency and environmental protection.

The birth and early development of ionic liquid desulphurisation technology

In the traditional technology of desulfurisation of sulfur dioxide, limestone, ammonia, etc. are usually used as absorbents to achieve the purpose of desulfurisation through chemical reaction with sulfide. However, these traditional technologies have problems such as high absorbent consumption, serious equipment corrosion, and secondary pollution. In order to overcome these problems, the engineers of Yizhi Technology began to explore new desulphurisation technology, and finally succeeded in developing the ionic liquid desulphurisation process technology.

Ionic liquids (organic amines) are substances that are in liquid state at room temperature. They have low vapour pressure, good thermal stability, are not hazardous, and have low or no toxicity. Ionic liquid desulphurisation technology is an innovative solution proposed by Yizhi Technology after in-depth research in the field of flue gas desulphurisation. The technology makes use of the characteristics of ionic liquid to achieve efficient absorption and resource utilisation of sulphur dioxide. At the same time of efficient desulphurisation, the technology can recover sulphur dioxide with a purity of up to 99.5%, which can be used for the production of chemical products such as sulphuric acid, liquid SO2 or sulphur, thus realising the resourceful use of sulphur pollutants, which not only solves the problem of environmental pollution, but also brings economic benefits to the enterprise.

Ion liquid desulphurisation technology since its appraisal in 2007, and continue to make important breakthroughs. 2008, Yizhi Technology will develop the organic solution cycle absorption desulphurisation technology formally named "Ion Liquid Desulphurisation Technology", and the first set of devices in the Bayan Nur Zijin Non-ferrous Metals Company Limited successful industrial application. This achievement marks the ionic liquid desulphurisation technology from the laboratory to industrial application.

Second, the ionic liquid desulfurisation technology of continuous innovation and upgrading

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

1. In 2010, the ionic liquid desulphurisation technology won the "First Prize of Science and Technology of China Nonferrous Metals Industry Association" and "First Prize of Science and Technology of Sichuan Environmental Protection". In the same year, a single set of large-scale ionic liquid desulphurisation plant was successfully started in China, and the flue gas capacity of the plant reached 1.2 million Nm3/h, which further proved the feasibility and high efficiency of ionic liquid desulphurisation technology.

2. In 2011, the organic amine desulphurisation agent in the CANSOLV plant was successfully changed to ionic liquid desulphurisation solvent, which is an innovative initiative that opens up a broader space for the application of ionic liquid desulphurisation technology.

3. In 2013, Yizhi Technology once again made a major breakthrough, successfully converting CANSOLV's desulphurisation plant in China, further enhancing the application scope and market share of ionic liquid desulphurisation technology.

4. In 2014, Ionic Liquid Desulphurisation (ILDS) technology successfully entered the petrochemical field and was used to treat the tail gas of CNOOC Huizhou Refining Krause. This application case fully demonstrated the wide applicability of ionic liquid desulphurisation technology in different industrial fields.

5. In 2015, Yizhi Technology once again challenged the technical limit and successfully applied ionic liquid desulphurisation (ILDS) technology to treat 7% of high concentration SO2 flue gas. This achievement further proves the high efficiency and stability of ionic liquid desulphurisation technology.

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

Ionic liquid desulphurisation technology is able to stand out in many desulphurisation technologies, thanks to its technical characteristics and advantages:

1. Desulphurisation agent recycling: ionic liquid can be recycled, small consumption, reducing the emission of pollutants and waste of resources.

2. High desulphurisation efficiency: sulphur dioxide removal rate ≥ 99.5%, sulphur content in the net flue gas of desulphurisation is no more than 50mg/Nm³, which meets the strict environmental requirements.

3. Resource utilisation: the gaseous sulphur dioxide with recovered purity ≥99.5% can be used for the production of chemical products such as sulphuric acid, sulphur or liquid sulphur dioxide, which realises the resource utilisation of sulphur pollutants.

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

5. Wide range of adaptability: when the flue gas has high sulphur content, the investment and operation cost of this technology is more advantageous, and it is applicable to various flue gas treatment scenarios.

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

Fourth, ionic liquid desulphurisation technology application areas and prospects

Ionic liquid desulphurisation technology, with its excellent performance and wide applicability, has been widely used in many fields such as non-ferrous metallurgical flue gas, boiler flue gas, Krause tail gas, catalytic regeneration flue gas and so on. With the increasingly strict environmental protection policy and the continuous development of industrial production, ionic liquid desulphurisation technology will face more challenges and opportunities.

Looking ahead, Yizhi Technology will continue to increase investment in research and development to promote the continuous innovation and upgrading of ionic liquid desulphurisation technology. At the same time, the company will also actively expand the international market, with global partners to promote the application and development of ionic liquid desulphurisation technology. It is believed that in the near future, ionic liquid desulphurisation technology will play a greater role in the world and make a greater contribution to the protection of the environment and the promotion of sustainable industrial development.