TH15832B - Processes for the production of isopropyl alcohol - Google Patents

Abstract

This invention revealed the method For the production of isopropyl alcohol by hydration Propylene and water directly in the presence with a catalyst that is Solid which is a strong acid consisting of Feeding polypropylene with water, where it is equal or greater than polypropylene in the mole term. And saturated hydrocarbons (propane, butane and the like) continuously to the reactor. Where solid catalysts are added or suspended. Conducts hydration while maintaining both temperature and pressure. Inside of the reaction tank In a state that is neither low nor just slightly lower Critical temperature or The critical pressure of polypropylene And hydrocarbons above And maintain the concentration Of isopropyl alcohol contained in the reaction fluid is 6% or more, and The ion cycle was extracted from the reaction tank. Do these parts to be Liquid by reducing pressure And cooling to separate the vapor and iso components Raw propyl alcohol contained in the liquid phase is purified. To obtain isopropyl Pure alcohol In these methods The isopropyl alcohol that is produced can be Spread selectively in the saturated hydrocarbon cycle in large quantities with the use of saturated hydrocarbons in conditions above or slightly below the critical temperature and critical pressure. Of saturated hydrocarbons Where this makes it possible to obtain a high concentration of isopropyl alcohol and the energy required for concentration And purification has also been reduced.

Claims (8)

1.Process for the production of isopropyl alcohol by hydrating propylene And water directly in the presence of a strong acidic solid catalyst, consisting of (1), continuously infuses polypropylene, water in an amount of 1 to 30 mol per mol of the reacted propylene. Isopropyl alcohol To adjust the isopropyl alcohol concentration to 6 to 30% by weight in the reaction liquid. And saturated hydrocarbons with 3 to 4 carbon atoms in an amount corresponding to 4 to 200 mol% of propylene fed into a reactor with such solid catalysts being added or treated. Suspended (2) performs a hydration reaction. By maintaining the temperature and pressure inside the reactor In conditions of 50 ° to 200 ° C and 60 to 250 atm (3), circulate at least part of the liquid phase out of the liquid. The reaction enters the reactor at a flow rate where water in the aforementioned liquid phase is at least 10 moles per mol of the reacted polypropylene and (4) extracts the vapor cycle of the product. Reaction from the reactor with the phase cycle It is the vapor of the inactive substance and saturated hydrocarbons, isopropyl, molten alcohol and water by reducing the pressure or cooling. To separate the vapor components and purify the resulting raw isopropyl alcohol contained in the aforementioned liquefaction phase to obtain pure isopropyl alcohol. 2. The process, as described in claim 1, where the amount of saturated hydrocarbons fed is 10 to 200 mol% on the basis of the amount of propylene fed. 3. The process described in claim 2 where the reaction temperature is 80 ํ to 150 ํ C 4. The process, as described in claim 2, whereby unreactive propylene and saturated hydrocarbons are recovered from the total or partial volume of the uncontaminated vapor. Condensation of the vapor phase is extracted from the reactor by distillation and circulating into the reactor 5. The process described in claim 1 where the amount of saturated hydrocarbons fed is 10 to 100 mol% of the amount of propylene fed. 6. The process as described in claim 5, where the reaction temperature is 80 ํ to 150 ํ C 7. The process is described in claim 1 where the reaction temperature is 80 ํ to 150 ํ C. 8. The process, as outlined in claim 1, where unreactive propylene and saturated hydrocarbons are recovered from the total or partial volume of the uncontaminated vapor. Condensation of the vapor phase extracted from the reactor By distillation and spiraling into the reactor