	US 12,304,879 B2
	Preparation method of 1-chloro-2,3,3-trifluoropropene
Farui Zheng, Zibo (CN); Yawei Zheng, Zibo (CN); Panming Jian, Zibo (CN); and Zihan Zheng, Zibo (CN)
Assigned to ZIBO RHEMA INTERNATIONAL INC., Zibo (CN)
Appl. No. 17/799,927
Filed by ZIBO RHEMA INTERNATIONAL INC., Zibo (CN)
PCT Filed Jan. 21, 2021, PCT No. PCT/CN2021/072972 § 371(c)(1), (2) Date Aug. 16, 2022, PCT Pub. No. WO2022/083017, PCT Pub. Date Apr. 28, 2022.
Claims priority of application No. 202011124655.1 (CN), filed on Oct. 20, 2020.
Prior Publication US 2023/0081584 A1, Mar. 16, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C07C 17/20 (2006.01)

CPC C07C 17/206 (2013.01)

3 Claims

1. A preparation method of 1-chloro-2,3,3-trifluoropropene, comprising the following steps:

1) subjecting 1,1,2,3,3-pentachloropropane to a reaction with hydrogen fluoride (HF) under a catalysis of a chromium-containing solid catalyst, wherein the 1,1,2,3,3-pentachloropropane is fluorinated into 1,2-dichloro-3,3-difluoropropene; the reaction is conducted at a temperature of 200° C. to 350° C., a space velocity of 60 h⁻¹to 570 h⁻¹, and a molar ratio of the HF to the 1,1,2,3,3-pentachloropropane as (5-25): 1; and the chromium-containing solid catalyst is an F-Cr₂O₃-loaded activated carbon or zirconium oxychloride catalyst;

2) fluorinating the 1,2-dichloro-3,3-difluoropropene into the 1-chloro-2,3,3-trifluoropropene with an HF gas phase under a catalysis of a catalyst, wherein the fluorinating is conducted at a temperature of 250° C. to 400° C., a space velocity of 50 h⁻¹to 550 h⁻¹, and a molar ratio of the HF gas phase to the 1,2-dichloro-3,3-difluoropropene as (1-8): 1; the catalyst comprises a main catalyst and a cocatalyst; and the main catalyst is a chromium-based catalyst treated with HF, and the cocatalyst is one or a mixture of two or more selected from the group consisting of Zn, Co, Ni, and Cu.