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US 2015/0307420 A1Published application
1, 3, 3, 3-tetrafluoropropene preparation process
AssigneesSinochem Lantian Co., Ltd., Sinochem Modern Environmental Protection Chimicals (Xi'an) Co., Ltd.
InventorsLei Xu, Gang Yang, Huie Yang, Shukang Chen, Zhixia Zhao
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Abstract
Disclosed is an HFO-1234ze preparation process. The present invention is realized by loading two fluorination catalysts into the same reactor, and controlling the temperature in each section. The preparation process of the present invention is of moderate reaction condition, stable catalyst activity, and simple process.
Claims12
A method for preparing HFO-1234ze, characterized in that the method comprises the following steps:
- (1) charging a reactor with a fluorination catalyst in two sections, wherein the first section of the fluorination catalyst is controlled at a temperature of 200-300° C., and the second section of the fluorination catalyst is controlled at a temperature of 350-450° C.;
- and
- (2) introducing gasified HF together with HCC-240fa and/or HCO-1230za into the reactor, passing through the first section of the fluorination catalyst and then through the second section of the fluorination catalyst, wherein a molar ratio of HF to the total organic phase is from 5:1 to 20:1, a contact time for the reaction is 1-30 seconds, a reaction pressure is 0.1-1.2 MPa, a product stream thus formed is treated to remove acid and water, and then distilled to afford HFO-1234ze.
Dependencies are inferred from the claim text.