A breakthrough in the new green preparation process of tetrachlorobenzoquinone to realize the resource utilization of tail gas

Tetrachlorobenzoquinone, as the key intermediate of high-performance organic pigment permanent violet, is widely used in anti-corrosion coatings, plastics, rubber, textile printing and dyeing and other fields. However, conventional manufacturing processes are generally plagued by severe exhaust-gas pollution and high treatment costs, which hinder the industry’s transition to greener practices.

Recently, a new invention patent technology on the synthesis of tetrachlorobenzoquinone has attracted attention. This process innovatively uses p-chlorophenol as the starting material. By optimizing the reaction route and conditions, the only byproduct generated throughout the entire production process is pure hydrogen chloride gas, eliminating the need for complex separation and purification steps. After being diluted and absorbed in water, this tail gas can be directly converted into commercial-grade hydrochloric acid with a concentration exceeding 30%, thereby achieving efficient recovery and utilization of the tail-gas resources and fundamentally resolving the longstanding challenges of difficult tail-gas treatment and secondary pollution inherent in conventional processes.

At the same time, the tetrachlorobenzoquinone product prepared by the new process has excellent purity, golden color, short melting range and significantly improved quality stability. The entire production process is environmentally friendly, significantly reducing wastewater and solid-waste discharge while markedly lowering production costs. This provides reliable technical support for the large-scale, clean production of quinone tetrachloride. Industry experts indicate that the widespread adoption of this technology will significantly advance energy conservation, emissions reduction, and sustainable development in the permanent violet pigment sector and its downstream industries.