Gas-phase continuous synthesis method of cis-1,1,1,4,4,4-hexafluoro-2-butene

• Main Authors: WU CHENXING, XU QINGRUI, HU QIXIANG, WANG XIAODONG
• Format: Patent
• Language: Chinese; English
• Published: 20.12.2019
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY

The invention discloses a gas-phase continuous synthesis method of cis-1,1,1,4,4,4-hexafluoro-2-butene. The method includes the following preparation steps: (1) mixing 1,1,1-trifluorotrichloroethane with hydrogen for a reaction so as to obtain a product stream I, transferring the product stream I to a first separation tower, absorbing the mixed product stream obtained at the tower top through a HCl absorption tower, and returning the mixed product stream to a reactor I so as to obtain 1,1,1,4,4,4-hexafluoro-2,3-dichloro-2-butene in the tower kettle; (2) transferring the tower kettle liquid obtained in the step (1) to a preheater II, introducing hydrogen at the same time, performing mixing and preheating until 200 DEG C, transferring the preheated mixture to a reactor II, performing a hydrodechlorination reaction under the action of a catalyst so as to obtain a product stream II, transferring the product stream II to a second separation tower, and circulating the tower kettle liquid tothe reactor II; and (3) t