Method of preparing tetrahydrofuran
The present invention relates to a process for preparing tetrahydrofuran from 1,4-butandiol. According to the process in the present invention, a metal sulfate catalyst selected from the group consisting of aluminum sulfate, nickel sulfate, ferrous sulfate and chrome sulfate is pre-treated with an inert gas to be activated, followed by introducing into a reactor together with 1,4-butandiol.
1. The process for preparing tetrahydrofuran from 1,4-butanediol, comprising the steps of:
pretreating a metal sulfate catalyst with an inert gas to be activated, and
introducing the activated catalyst into a reactor with 1,4-butanediol wherein the metal sulfate catalyst is selected from the group consisting of aluminum sulfate, nickel sulfate, ferrous sulfate and chromium sulfate.
2. The process for preparing tetrahydrofuran from 1,4-butanediol according to claim 1 , wherein the metal sulfate is introduced in quantities of 0.1 to 20 parts by weight based on 100 parts by weight of 1,4-butanediol.
3. The process for preparing tetrahydrofuran from 1,4-butanediol according to claim 1 , wherein the temperature of activation by pre-treatment is 200 to 700° C., and the reaction temperature of the reactor is 150 to 350° C.
4. The process for preparing tetrahydrofuran from 1,4-butanediol according to claim 1 , wherein the reactor is a fixed-bed reactor or a mixed reactor.
5. The process for preparing tetrahydrofuran from 1,4-butanediol according to claim 1 , wherein the inert gas is selected from the group consisting of helium, nitrogen and argon gas.