橡胶噻唑类助剂副产物利用难题告破

Core Viewpoint - Hengli Rubber and Plastic Co., Ltd. has developed a new comprehensive treatment process for rubber thiazole auxiliary agent by-products, achieving over 80% recovery efficiency of key components such as 2-Mercaptobenzothiazole (MBT), benzothiazole, and sulfur [1][2] Group 1: New Process and Benefits - The new process simplifies operations and maintains controllable costs, making it suitable for large-scale industrial production [1] - The process effectively reduces the generation of resin by-products in the rubber auxiliary agent industry by over 80%, allowing for the recovery of unreacted sulfur and the production of MBT and benzothiazole [1][2] - In 2024, the company plans to process 8,000 tons of waste using this technology, generating approximately 30 million yuan in revenue [1] Group 2: Comparison with Traditional Methods - Traditional high-temperature distillation methods recover only about 20% of benzothiazole from MBT by-products, resulting in 80% residue, which increases production costs [2] - High-temperature distillation poses safety and environmental risks due to the generation of toxic hydrogen sulfide gas [2] - An alternative method using water co-boiling is safe but consumes about 30 tons of water per ton of product, leading to high costs and significant wastewater generation [2] Group 3: Process Description - The new process involves mixing by-products with solvents for solid-liquid separation, followed by dissolving solids in liquid alkali and secondary separation to obtain sulfur and MBT sodium salt solution [3] - The process includes neutralization with sulfuric acid to precipitate MBT, and further separation and purification steps to recover sulfur, MBT, and benzothiazole for downstream production [3] - The entire process allows for the complete utilization of by-products and solvent recycling, enhancing resource efficiency [3]