Method of preparing tetrahydrofuran
A technology of tetrahydrofuran and butanediol, applied in chemical instruments and methods, organic chemistry, physical/chemical process catalysts, etc., can solve the problems of low tetrahydrofuran yield, dangerous methods, etc., and achieve the effect of excellent reactivity
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0025] A fixed bed reactor with a diameter of 20 mm and a length of 520 mm was used for the gas phase catalytic reaction. First, 2 g of aluminum sulfate catalyst was charged into the reactor, and the catalyst was activated with helium at 370° C. for 2 hours. Using a syringe pump, 1,4-butanediol at a flow rate of 0.5 cc / min was mixed with helium and fed into the reactor at a constant flow rate of 5.0 liters / hour. The reaction was carried out at 200° C. under one atmospheric pressure, and the reaction products were analyzed on-line using a Poropak QS column and a gas chromatograph equipped with a flame ionization detector (FID). After the reaction reached a steady state, the products passing through the reactor were analyzed. The yield of tetrahydrofuran was 98.5%.
Embodiment 2
[0027] The liquid-phase catalytic reaction was carried out in a 500 ml three-necked round bottom reactor equipped with a magnetic stirrer and reflux device. Before the reaction, the catalyst was activated with helium gas at 300° C. for 2 hours, and 0.5 g of pretreated aluminum sulfate and 100 g of 1,4-butanediol were added to the reactor. The reaction was carried out at a temperature of 200° C. for 1 hour, and the reaction product was condensed using a condenser. The condensed product was then distilled to separate residual 1,4-butanediol and analyzed using a gas chromatograph as described in Example 1. As a result, 98.5% tetrahydrofuran was obtained.
Embodiment 3-5
[0029] Except using one of transition metal sulfate catalysts such as nickel sulfate, ferrous sulfate and chromium sulfate of 1g and 100g of 1,4-butanediol respectively, all the other are in the same manner as described in Example 2 The preparation process of tetrahydrofuran was carried out. The yields for each reaction are listed in Table 1.
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More