Reaction process using supercritical water

Abstract

The technical problems to be solved in the invention are that during the cooling and distilling of the reaction fluid which enables the raw materials of organic compounds and acids to be reacted in a supercritical water, the heat and water use amount can be restrained, the operation cost of a whole set of equipment can be reduced. The invention relates to a method and a device, including obtaining a target substance by gradually cooling the reaction liquid by cooling in a plurality of stages divided in series, and then distilling the cooled reaction liquid by distillation in a plurality of stages divided in series; circulating a heating medium to be used for cooling in the plurality of the stages by way of; sequentially passing the heating medium toward the most upstream cooling stage from the most downstream cooling stage of the reaction liquid; cooling the heating medium which has been discharged from the most upstream cooling stage by using the heating medium for keeping or raising the temperature of the liquid which has been discharged from the distillation in the plurality of the stages; returning the cooled heating medium back to the most downstream cooling stage of the reaction liquid; circulating the above heating medium;using the water obtained by removing solid components, organics and acids out of the flow fluid discharged from the most upstream of the distillation in the plurality of the stages as a raw water or a reaction quenching cooling water taking the reaction stop as the purpose, and circulating the water.

Description

technical field [0001] The present invention relates to a method or device for obtaining a target substance by cooling and distilling a reaction liquid obtained by reacting an organic compound raw material and an acid in the presence of hydrogen ions in supercritical water, especially a method and device for synthesizing acrolein from glycerol. Background technique [0002] Since 1,3 propanediol is a raw material of high-quality polyester fibers represented by polytrimethylene terephthalate (PTT), the demand has increased greatly in recent years. As one of the synthesis methods of 1,3 propanediol, there is the acrolein hydration / hydrogenation method described in Non-Patent Document 1. This is a method of hydrating and hydrogenating acrolein synthesized by air oxidation of propylene, which is a petroleum raw material, in the presence of a catalyst, and has been established as an industrial production method. However, since the price of crude oil has skyrocketed in recent yea...

AI Technical Summary

Problems solved by technology

However, since a plurality of coolers with different cooling temperatures are provided, there is a problem that the amount of cooling water used for stopping the reaction is large, and the amount of energy required for recooling the used cooling water is large.

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