- PREPARATION OF 2,3,3,3-TETRAFLUOROPROPENE AND INTERMEDIATES THEREOF
-
The present invention provides a process for preparation of 2,3,3,3-tetrafluoropropene and intermediates thereof. Owing to its low global warming potential and zero ozone depleting potential, it is been proposed as a replacement for existing chlorofluorocarbons and hydrofluorocarbons as refrigerant.
- -
-
Page/Page column 13
(2020/05/15)
-
- PROCESSES FOR THE DEHYDROCHLORINATION OF A CHLORINATED ALKANE
-
The present invention provides a process for the dehydrochlorination of a chlorinated alkane to produce a chlorinated alkene. In particular, the processes comprise contacting a chlorinated alkane, a base, and a phase transfer catalyst.
- -
-
Paragraph 0043; 0044
(2018/03/28)
-
- A method of synthesizing 2,3,3,3-tetrafluoropropene
-
A method of synthesizing 2,3,3,3-tetrafluoropropene is disclosed. The method includes (1) reacting 1,1,1,3-tetrachloropropane with metal powder, and subjecting a reaction solution to alkali washing, drying and rectification to obtain trichloropropylene, (2) mixing the trichloropropylene prepared in the step (1) with a solvent, feeding a fluorine-nitrogen mixed gas, reacting, and rectifying the reaction solution to obtain difluorotrichloropropane, and (3) reacting the difluorotrichloropropane prepared by the step (2) with anhydrous hydrogen fluoride under an action of a catalyst, and subjecting a reaction product to alkali washing, drying and compression to obtain a 2,3,3,3-tetrafluoropropene product. The method has advantages of a simple process, a low cost and environment protection.
- -
-
Paragraph 0031; 0032; 0035; 0036; 0039; 0040; 0043; 0044
(2017/08/27)
-
- PROCESS FOR PREPARING 2,3,3,3-TETRAFLUOROPROPENE
-
The present invention provides a method for efficiently preparing 2,3,3,3-tetrafluoropropene (HFO-1234yf) by a simple and economically advantageous method that is suitable for implementation on an industrial scale. The present invention provides a process for preparing 2,3,3,3-tetrafluoropropene, comprising the step of: (1) in a reactor, (1-1) reacting 1,1,1,2,3-pentachloropropane with hydrogen fluoride in an amount of 10 to 100 mol per mole of the 1,1,1,2,3-pentachloropropane 1; (1-2) in the presence of chromic oxide represented by composition formula: CrOm (1.5m3) or fluorinated chromic oxide obtained by fluorinating the chromic oxide; (1-3) in the presence of oxygen in an amount of 0.02 to 1 mol per mole of the 1,1,1,2,3-pentachloropropane; and (1-4) in the gas phase within a temperature range of 320 to 390 degrees centigrade, thereby obtaining a reaction product containing 2,3,3,3-tetrafluoropropene.
- -
-
Page/Page column 12-13
(2013/03/26)
-
- PROCESS FOR PREPARING CHLORINE-CONTAINING FLUOROCARBON COMPOUND
-
The present invention provides a process for preparing at least one chlorine-containing fluorocarbon compound selected from the group consisting of chlorine-containing fluoropropane compounds represented by Formula (1): CFnCl3-nCHClCH2—Cl, wherein n is 1 or 2, and chlorine-containing fluoropropene compounds represented by Formula (2): CFnCl3-nCCl═CH2, wherein n is 1 or 2, wherein the process includes the step of contacting at least one chlorine-containing compound selected from the group consisting of 1,1,1,2,3-pentachloropropane, 1,1,2,3-tetrachloropropene, and 2,3,3,3-tetrachloropropene with hydrogen fluoride in the absence of a catalyst while heating. According to the present invention, the chlorine-containing propane and propene compounds having 1 or 2 fluorine atoms can be prepared by an industrially applicable, simple and effective process.
- -
-
Page/Page column 4
(2012/03/27)
-
- METHOD FOR PRODUCING 1,1,3-TRICHLORO-1-PROPENE
-
A production method of 1,1,3-trichloro-1-propene comprising the following steps A and B; Step A: 1,1,1,3-tetrachloropropane is dehydrochlorinated at a temperature between 30° C. and 50° C. in the presence of at least one base selected from the group consisting of alkali metal hydroxides and alkaline earth metal hydroxides, and a phase transfer catalyst, Step B: 3,3,3-trichloro-1-propene obtained in the step A is isomerized into 1,1,3-trichloro-1-propene in the presence of a metal catalyst.
- -
-
Page/Page column 4; 5
(2012/06/16)
-
- PROCESS FOR PREPARING 1,1,2,3-TETRACHLOROPROPENE
-
The present invention provides a process for preparing 1,1,2,3-tetrachloropropene, including heating 1,1,1,2,3-pentachloropropane in a gas phase in the absence of a catalyst to carry out a dehydrochlorination reaction. According to the process of the present invention, 1,1,2,3-tetrachloropropene (HCC-1230xa) can be efficiently produced by a simple and economically advantageous method that is suitable for industrial-scale production.
- -
-
Page/Page column 10
(2011/06/23)
-
- PROCESS FOR PREPARING 2-CHLORO-3,3,3-TRIFLUOROPROPENE
-
The present invention provides a process for preparing 2-chloro-3,3,3-trifluoropropene including subjecting, in the absence of a catalyst, at least one chlorine-containing compound selected from the group consisting of chloropropane represented by formula (1): CClX2CHClCH2Cl, wherein each X is the same or different and each represents Cl or F, chloropropene represented by formula (2): CClY2CCl=CH2, wherein each Y is the same or different and each represents Cl or F, and chloropropene represented by formula (3): CZ2=CClCH2Cl, wherein each Z is the same or different and each represents Cl or F, to a reaction with hydrogen fluoride under heating in a gas phase. According to the present invention, 2-chloro-3,3,3-trifluoropropene (HCFC-1233xf) can be effectively prepared by an easy and economically advantageous process that is suitable for industrial scale production.
- -
-
Page/Page column 10; 11
(2010/11/05)
-
- PROCESS FOR PREPARING CHLORINE-CONTAINING FLUOROCARBON COMPOUND
-
The present invention provides a process for preparing at least one chlorine-containing fluorocarbon compound selected from the group consisting of chlorine-containing fluoropropane compounds represented by Formula (1) : CFnCl3-nCHClCH2Cl, wherein n is 1 or 2, and chlorine-containing fluoropropene compounds represented by Formula (2) : CFnCl3-nCCl=CH2, wherein n is 1 or 2, wherein the process includes the step of contacting at least one chlorine-containing compound selected from the group consisting of 1, 1, 1, 2, 3-pentachloropropane, 1, 1, 2, 3-tetrachloropropene, and 2, 3, 3, 3-tetrachloropropene with hydrogen fluoride in the absence of a catalyst while heating. According to the present invention, the chlorine- containing propane and propene compounds having 1 or 2 fluorine atoms can be prepared by an industrially applicable, simple and effective process.
- -
-
Page/Page column 11-12
(2010/12/17)
-