Chloromethane synthesis reaction heat gradient comprehensive utilization process

Abstract

The invention discloses a chloromethane synthesis reaction heat gradient comprehensive utilization process. High-temperature synthesis gas discharged from the chloromethane synthesis kettle is subjected to heat exchange through the first-stage vaporizer, the second-stage vaporizer and the water cooler in sequence, and the unreacted components (hydrogen chloride or methanol) in a reaction product are recycled, and meanwhile, liquid methanol is vaporized, so that utility consumption is greatly reduced. Compared with the prior art, the process has the advantages that the heat of the high-temperature synthesis gas is utilized in a gradient manner, the consumption of process steam and circulating water is greatly reduced, unreacted components are recycled, and the material consumption is reduced. Furthermore, the process can better adapt to various working conditions deviating from the design point, such as reaction speed fluctuation, methanol or hydrogen chloride feeding amount fluctuation, gas phase composition temperature fluctuation and the like, and is high in automation degree, high in reliability and easy for industrial application.

Description

technical field [0001] The invention belongs to the field of methyl chloride synthesis, and in particular relates to a stepwise comprehensive utilization process of reaction heat of methyl chloride synthesis. Background technique [0002] Chloromethane is an important raw material for organic silicon, pesticides and other products. At present, the synthesis methods of methyl chloride mainly include homogeneous gas-phase method, gas-solid catalytic method and gas-liquid method. Among them, the gas-liquid method has mild reaction conditions and high reaction selectivity, and is most widely used in the actual production process. However, in the traditional gas-liquid production process, the raw material methanol is usually heated and vaporized by low-pressure steam, and then enters the methyl chloride synthesis tank with hydrogen chloride gas, and reacts under the catalysis of zinc chloride solution to form methyl chloride. The high-temperature synthesis gas (about 150°C) exi...

AI Technical Summary

Problems solved by technology

However, the above devices have shortcomings. On the one hand, it cannot guarantee the complete vaporization of methanol under fluctuating conditions. On the other hand, this method does not consider the recovery of the syngas condensate and the liquid catalyst brought out by the gas entrainment phenomenon.

In addition, the synthesis gas in this device adopts one-stage gas-liquid separation, and the amount of condensed liquid cannot be controlled. In addition, due to the limitation of process conditions, all the condensed liquid cannot be returned to the kettle for reaction. If the reuse of condensed liquid is considered, there is also the problem of catalyst loss.

Images