China Drying Network News through the high-temperature steam stripping process, some of the organic waste sulfuric acid volatilized, partially cured to produce new compounds. The content of sulfuric acid after purification was still 90%~92%, but the solid content increased to 2.24%. Due to the efficient use of the extraction and filtration process of phosphoric acid, the treated sulfuric acid can be used to produce phosphoric acid without filtration and decolorization, so that the waste sulfuric acid becomes waste. At the same time, the purification and recycling process is simple and the cost is low. Through further processing, the requirements for commercial sulfuric acid can be achieved.
The acetylene gas used in the production of 1,4-butanediol needs to be cleaned and purified with concentrated sulfuric acid. The waste sulfuric acid produced is a stable dark brown viscous liquid, except that it contains 90%~92% of sulfuric acid and 5%~7% of water. In addition, the rest is impurities. Since there are many organic substances that are difficult to handle in the impurities, if they are directly discharged or discharged after simple neutralization treatment, they will cause environmental pollution and waste of resources. This is also a technical problem that has long been plagued by the production of 1,4-butanediol in China.
The Bidio Chemical Company and the compound fertilizer plant under Shanhua Chemical respectively have a 30,000-ton/year 1,4-butanediol plant and a 200,000-ton/year diammonium phosphate plant, among which the 1,4-butanediol plant annually Produce 1,000 to 3,000 tons of waste sulfuric acid. After the 1,4-butanediol project was completed and put into production in 2010, the compound fertilizer plant technicians combined the actual production of sulfuric acid with diammonium phosphate, and continuously explored the waste sulfuric acid purification and recycling treatment technology.
Wang Fading said that in August 2011, Shanhua started experimental research on the treatment of waste sulfuric acid purification, and after repeated tests and phosphoric acid production simulation, the waste sulfuric acid was finally treated by high-temperature stripping indirect method. The preliminary success was obtained and relevant data were obtained. In February of this year, the plant built a 1 ton/h waste sulfuric acid treatment pilot plant on the original sulphuric acid facility, and accumulated 81 tons of sulphuric acid, which was mixed with the genuine sulphuric acid at a proportion of 15% (sulfuric acid content) for phosphoric acid production. Process operation and product quality are stable. In May of this year, the BDO waste sulfuric acid recovery and recovery pilot project passed the technical review.
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