KR960031412A - Method for producing isopropyl alcohol - Google Patents

Abstract

A process for producing isopropyl alcohol by directly hydrolyzing propylene and water under high pressure and high pressure in the presence of a strongly acidic solid catalyst, wherein the reaction is carried out at 60 to 200 atm at 100 to 250 ° C while supplying extra water, The liquid phase formed is divided into the amount of the extracting agent divided by the amount of the raw material extracted at a temperature higher than the critical temperature of the extracting agent by 40 ° C. and the critical input of the extracting agent to 200 atm together with the extraction agent formed of saturated hydrocarbons having 3 or 4 carbon atoms And is contacted so as to have a ratio of 0.3 to 3 calculated from the expression, and finally, isopropyl alcohol is extracted from the liquid phase and then separated on the obtained extraction. According to this method, the energy required to concentrate isopropyl alcohol is reduced and does not require a large-scale production facility.

Description

Method for producing isopropyl alcohol

Since this is a trivial issue, I did not include the contents of the text.

Claims (7)

In the presence of a strong acidic solid catalyst, propylene and water are directly hydrated at a high temperature and under a high pressure, and the resulting reaction mixture is separated into a jouisopropyl alcohol solution, and this solution is purified to prepare isopropyl alcohol. (1) (2) a step of continuously feeding propylene and water to be reacted at a rate of at least 1 mole per mole of propylene continuously at a temperature of 100 to 250 ° C and at a temperature of 60 to 200 atm in a packed or suspended reactor, (3) The gaseous phase of the reaction mixture is fed to the distillation column to remove impurities composed mainly of propane contained in the raw propylene at the bottom of the column, recover unreacted propylene from the top of the column, (4) contacting the liquid phase of the reaction mixture with an extraction agent formed of saturated hydrocarbons having 3 or 4 carbon atoms and an extraction agent formed of a saturated hydrocarbon having a carbon number of 40 From a liquid phase of the reaction mixture at a high temperature and a ratio of 0.3 to 3 as calculated by the expression expressed by the amount of the extracting agent divided by the extraction amount of the raw material at the critical pressure of the extracting agent to 200 atm, (5) recirculating a major amount of the remaining liquid after the extraction, which is mainly composed of water, and (6) separating isopropyl alcohol into a high concentration solution mainly on the extract consisting of the saturated hydrocarbons And a step of purifying the use liquid to obtain purified isopropyl alcohol. 2. The method according to claim 1, wherein isopropyl alcohol as the high concentration solution formed through the reaction in the extraction phase mainly composed of the saturated hydrocarbon obtained by bringing the liquid phase of the reaction mixture into contact with the extraction agent is mixed with the vapor phase mainly composed of the saturated hydrocarbons, Characterized in that a liquid phase consisting mainly of isopropyl alcohol and water is separated by reducing the pressure of the extraction phase to below the critical pressure of the saturated hydrocarbon. 2. The method according to claim 1, wherein isopropyl alcohol as a high concentration solution formed through the reaction in an extraction phase mainly composed of the saturated hydrocarbon obtained by bringing the liquid phase of the reaction mixture into contact with the extractant is mixed with a light liquid phase mainly composed of the saturated hydrocarbon Characterized in that the separation is carried out by cooling the extracted phase to below the critical temperature of the saturated hydrocarbon while maintaining the pressure of the extraction phase substantially in a heavy liquid phase consisting mainly of isopyropyl alcohol and water. 4. The method according to any one of claims 1 to 3, wherein isopropyl alcohol formed through the reaction is separated as a high-concentration solution, which is obtained by contacting the liquid phase of the reaction mixture with the extractant and mainly comprising the saturated hydrocarbon, And recycling the recovered major amount of the saturated hydrocarbon as an extractant. 5. The process according to claim 4, wherein part of the saturated hydrocarbon recycled as the extractant is extracted and fed to the vapor column together with the vapor phase of the reaction mixture, and the saturated hydrocarbon is separated from the bottom of the distillation tower. ≪ / RTI > 6. The process for producing isopropyl alcohol according to any one of claims 1 to 5, wherein the saturated hydrocarbon is propane. 7. A process according to any one of claims 1 to 6, characterized in that propane which is contained in the raw propylene as at least a part of the extracting agent and is separated from the bottom of the distillation column at the time of distillation recovery of unreacted propylene is used Isopropyl alcohol. ※ Note: It is disclosed by the contents of the first application.