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Diethylbenzene-impregnated graphite heat exchangers perform significantly better than traditional materials under high-temperature and highly corrosive conditions, offering key advantages such as a temperature resistance of up to 320–500°C, strong resistance to penetration, and a long service life. The specific benefits are reflected in the following three aspects: the high-temperature resistance has been significantly improved. Compared to impregnation with phenolic resin (where the operating temperature under long-term use is ≤170°C), divinylbenzene impregnation greatly expands the temperature range for graphite heat exchangers, enabling them to operate stably in high-temperature environments of 320–500°C. In an inert atmosphere, some of these devices can even withstand extreme temperatures of 800–1200°C, making them suitable for high-temperature reactions, pyrolysis, and other processes. It offers greater corrosion and permeation resistance. Divinylbenzene resin has a more dense cross-linked structure that effectively prevents the penetration of corrosive substances, making it particularly suitable for use in highly corrosive chemical processes involving hydrochloric acid, sulfuric acid, pesticide intermediates, and similar substances. In typical operating conditions such as hydrogen chloride absorption and hydrogen fluoride condensation, the equipment can achieve a service life of 5 to 10 years or more, which is far longer than the 1 to 3 years for stainless steel or titanium alloy equipment. It features excellent structural stability and energy-saving benefits. These types of heat exchangers adopt a block-and-hole or tube-in-tube structure, possessing good mechanical strength and thermal stability, allowing them to withstand certain levels of thermal shock and pressure fluctuations. In practical applications, for instance, when a pesticide factory uses rectangular-block-hole graphite heat exchangers to treat acidic wastewater, the equipment’s service life reaches 10 years, and it saves 1.2 million yuan in steam costs per year, demonstrating excellent economic efficiency.