Rubber additives industry accelerates greening

Greening is the general direction of the development of the world chemical industry, and it is also the eternal theme of the fine chemical industry such as rubber additives. Although after years of hard work, the rubber auxiliaries industry has made great progress in clean production, but a small number of products will produce carcinogenic nitrosamines, and the clean production process for the production of large-tonnage products has not yet been popularized. Some devices are environmentally friendly. The situation of forced production suspension and limited production due to pollution problems still occurs occasionally.

At present, a large variety of toxic and harmful rubber additives such as NOBS and anti-aging agent D have achieved green substitution, but small varieties such as thiuram, sodium thiocarbamate and pentachlorothiophenol have not been eliminated. The future focus should be on accelerating the adjustment of the structure of super-accelerator products, accelerating the industrialization of TBzTD (tetrabenzyl thiuram disulfide), and replacing nitrosamines such as TMTD (tetramethylthiuram disulfide). Among them, thiuram super accelerator TMTD, TMTM (tetramethyl thiuram monosulfide) and carbamate ZDC will produce carcinogenic nitrosamines, the main substitutes TBzTD and TiBTM (tetraisobutyl sulfonate) Kiryulam has gradually realized industrialization. Pentachlorothiophenol chemical peptizer has been discontinued in Europe and the United States, and its main substitute is DBD (2,2'-dibenzoylaminodiphenyl disulfide). The production technology of these alternatives has been successfully developed in China, and its replacement efforts must be increased in the future.

The development and implementation of the clean production process route is an important measure to ensure the environmental protection of the rubber additive production process. In recent years, oxygen oxidation produces NS clean production technology, 10,000-ton high-heat stability insoluble sulfur production technology, 10,000-ton clean pre-dispersant rubber additive products, and replaces the traditional acid-base process production accelerator M with solvent method. The production process has made breakthroughs in achieving waste water discharge. However, the wastewater problem of M, which is both a promoter and a raw material for many promoters, has not been fully solved. No wastewater discharge technology has yet to be widely promoted; in addition, sulfenamide accelerators and DM products oxidation process, NS oxygen oxidation Clean production processes such as process and DM hydrogen peroxide oxidation process, although successful, have yet to be promoted.

The rubber auxiliaries represented by accelerators are mostly high-salt, high-COD, high-resin wastewater. At present, mainstream water treatment methods include multi-effect evaporation or MVR evaporation, biochemical treatment, catalytic oxidation, and adsorption. However, it turns out that many wastewater treatment methods can't achieve good results in practical applications. The salt-containing wastewater generally evaporates and demineralizes, and then evaporates the water for biochemical treatment; if it is difficult to biochemically, it can be biochemically improved by catalytic oxidation or the like, and then enters biochemical treatment. For advanced treatment, activated carbon adsorption or sand filtration can be used to achieve effluent compliance. Among the existing treatment methods, "multi-effect evaporation or MVR evaporation + biochemical treatment" is the most effective treatment. However, there are still relatively few companies in the industry that have the processing equipment, and they must be promoted and used in the industry.