Circulating heat exchange agent for reactor

Abstract

The invention discloses a circulating heat exchange agent for a reactor. In the invention, chlorinated hydrocarbons and a heat stabilizing agent are employed, wherein the chlorinated hydrocarbons include at least one selected from trichloroethane, tetrachloroethylene, tetrachloroethane and pentachloroethane, and the heat stabilizing agent is any one selected from hydroquinone, cresol or triethanolamine stearate. The trichloroethane, the tetrachloroethylene, the tetrachloroethane and the pentachloroethane are low in gasification latent heat and are free of corrosion on the reactor, so that reaction temperature is easy to control and a reaction process is relatively stable, thereby ensuring effective production efficiency of the reactor and reducing maintaining cost. The circulating heat exchange agent itself is very stable and is not a flammable and explosive substance, so that the circulating heat exchange agent can be separated out in subsequent process and does not cause influence on product quality even the heat exchange agent leaks in the reactor. The heat exchange agent is suitable for a reaction system of producing chloroethylene through a traditional calcium carbide method with a mercuric chloride catalyst and also can be used for other reaction systems being controllable in reaction temperature, so that the heat exchange agent is excellent in promotion and application value and development prospect.

Description

technical field [0001] The invention relates to the field of chemical production, in particular to a heat exchange agent applicable to an acetylene hydrochlorination synthesis reaction system. Background technique [0002] Most of the reactions in the chemical reaction process are exothermic reactions. Taking the synthesis of vinyl chloride from acetylene and hydrogen chloride as an example, soft water is often used as the reactor circulation heat exchange agent, and the sensible heat and latent heat of water are used to remove the heat generated in the synthesis reactor. The temperature of the soft water is controlled within 100 °C. Although soft water has low hardness, long-term operation, especially in high-temperature environments, will cause equipment to leak due to scaling and corrosion. Once the water enters the reactor, it will form hydrochloric acid with the hydrogen chloride gas in the raw material gas in the reactor. However, hydrochloric acid is highly corrosive...

AI Technical Summary

Problems solved by technology

Although soft water has low hardness, long-term operation, especially in high-temperature environments, will cause equipment to leak due to scaling and corrosion. Once the water enters the reactor, it will form hydrochloric acid with the hydrogen chloride gas in the raw material gas in the reactor. However, hydrochloric acid is highly corrosive, which will seriously corrode the equipment and cause the catalyst to agglomerate, causing the active components in the catalyst to be lost and inactivated, which will seriously block the reactor tubes, reduce the production efficiency, and increase the maintenance cost

At the same time, when a new type of mercury-free catalyst is used to catalyze the hydrochlorination of acetylene, the reaction temperature is >180°C, and the temperature requirements for the reaction induction period, the stabilization period, and the final stage of the reaction are different. The traditional 97°C hot water is difficult to achieve high temperature exchange hot request

There is also a heat exchange agent for vinyl chloride reaction that uses heptane. Although the temperature control is very stable, heptane is a flammable and explosive substance, which increases the danger of the system. A little air will cause an explosion.