Abstract:
The present invention discloses a manufacturing process to produce high purity 1234yf from 245eb, which preferably includes the removal of impurities present in 245eb raw material, the dehydrofluorination of 245eb, and the removal of impurities present in final crude product. The disclosed manufacturing process allows the production of a 1234yf product with lower the levels of 1225ye and/or trifluoropropene, preferably in amounts of less than about 500, and 50 ppm, respectively.
Abstract:
This invention pertains to a method for removing acidic impurity from halogenated olefins, especially methods for removing acidic impurity from halogenated propenes, and even more particularly to methods for removing acidic impurity from 1,3,3,3-tetrafluoro-1-propene (HFO-1234ze), 2,3,3,3-tetrafluoro-1-propene (HFO-1234yf), 1-chloro-3,3,3-trifluoro-1-propene (HCFO-1233zd), and 2-chloro-3,3,3-trifluoro-1-propene (HCFO-1233xf). The method is conducted by passing the halogenated olefin stream, in liquid or gas form, through a solid adsorbent bed, which contains at least one acid reactive agent.
Abstract:
The present invention relates, in part, to the discovery that high temperatures during the fluorination of 1,1,2,3-tetrachloropropene (HCO-1230xa) to 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) results in catalyst instability, reduced selectivity of the conversion, and/or the formation of one or more undesirable by-products. By controlling the reaction temperature, it is shown that the catalyst life may be extended and the selectivity of the reaction improved. Such control similarly results in an overall improvement in the production of certain hydrofluoroolefins, particularly 2,3,3,3-tetrafluoropropene (HFO-1234yf).
Abstract:
Provided are azeotropic or azeotrope-like mixtures of 1,3,3-trichloro-1,1-difluoro-propane (HCFC-242fa) and hydrogen fluoride. Such compositions are useful as a feed stock or intermediate in the production of HFC-245fa and HCFO-1233zd.
Abstract:
A process for making a fluorinated olefin having the step of dehydrochlorinating a hydrochlorofluorocarbon having at least one hydrogen atom and at least one chlorine atom on adjacent carbon atoms, preferably carried out in the presence of a catalyst selected from the group consisting of (i) one or more metal halides, (ii) one or more halogenated metal oxides, (iii) one or more zero-valent metals/metal alloys, (iv) a combination of two or more of the foregoing.
Abstract:
This invention relates to methods and systems for producing hydrochlorofluoro-olefins, particularly 1-chloro-3,3,3-trifluoropropene (HCFO-1233zd) by the fluorination of a starting material selected from the group consisting of 1,1,1,3,3-pentachloropropane (HCC-240fa), 1,1,3,3-tetrachloropropene, and 1,1,1,3-tetrachloropropene, alone or in combination, in an ionic liquid.
Abstract:
A method for forming 2,3,3,3-tetrafluoropropene (HFO-1234yf) comprising providing a dehydrochlorination starting material having relatively low concentrations of 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf), especially and preferable less than about 8.0% when the dehydrochlorination reaction utilizes no substantial amount of catalyst or catalyst comprising austenitic nickel-based materials.
Abstract:
The present invention provides an improved process for producing 1,1,2,3-tetrachloropropene. By using a first reactive distillation column for HCC-250fb dehydrochlorination, and a second reactive distillation column for HCC-240db dehydrochlorination/HCC-1230xf isomerization, the 1,1,2,3-tetrachloropropene manufacturing process can be greatly simplified, resulting in reduced equipment use, energy use, as well as increased productivity.
Abstract:
The present invention relates, in part, to the discovery that the presence of impurities in a reactor for dehydrochlorinating HCFC-244bb to HFO-1234yf results in selectivity changeover from HFO-1234yf to HCFO-1233xf. By substantially removing such impurities, it is shown that the selectivity to HFO-1234yf via dehydrochlorination of HCFC-244bb is improved.
Abstract:
This invention is directed to a method for mitigating HCl generation during 1230xa purification, which comprises the steps of; (a) adding a chelating agent into 1230xa crude, and (b) conducting the 1230xa purification in the presence of said chelating agent at a quantity sufficient to reduce or prevent 1230xa decomposition. Examples of chelating agent include tributyl phosphate (TBP), tripropyl phosphate (TPP), and triethyl phosphate (TEP). The concentration of chelating agent in 1230xa crude can range from 0.001 to 20 wt %, preferably from 0.01 to 10 wt %, and more preferably from 0.1 to 5 wt %.