The preparation method makes use of propylene as a basic material, makes use of diatomite phosphate as a stimulant, and also straight hydrates isopropanol under pressure. The process is to pressurize propylene and also water to 2.03 MPa specifically, and also preheat to 200 ℃. After mixing, go into the reactor to execute hydration response. The activator is geared up with a phosphate diatomite driver, the response temperature is 95 ℃, as well as the stress is 2.03 ℃. MPa, the molar ratio of water to propylene is 0.7:1, the conversion price of propylene is 5.2%, and the selectivity is 99%. After neutralization and warmth exchange, the reaction gas is sent to the high-pressure cooler as well as the high-pressure separator. The alcohol is recouped by splashing without salt water in the recovery tower, and the unreacted gas is reused by the circulating compressor. The fluid phase is low concentration Ipa Isopropyl Alcohol (15%～ 17%). The propanol aqueous service is fixed to 95% with a correcting tower, and afterwards drawn out to greater than 99% with benzene. This method is the primary approach for creating isopropanol in your home as well as abroad.
The technique does not use sulfuric acid, there is no deterioration problem, as well as the procedure flow is reasonably basic.
There is also a sulfuric acid hydration method, that is, using propylene containing more than 50% as raw material, absorbing 75%-85% concentrated sulfuric acid in an absorption tower at 50 ° C and low pressure, and diluting the absorption liquid to a sulfuric acid content of 35%, It is hydrolyzed to isopropanol with low pressure steam in the desorber. The propylene conversion rate of the method can reach more than 90%, and the obtained crude product Ipa Isopropyl Alcohol contains isopropyl alcohol as high as 50% to 60%. This method uses sulfuric acid, which is highly corrosive to equipment. In addition, dilute sulfuric acid should be concentrated and applied.
CH3CH=CH2+H2SO4→(CH3)2CHOSO3H[H2O]→(CH3)2CHOH+H2SO4
