Patent Issued for Synthesis of 1,1,3-Trichloro-1-Propene
2013 DEC 2 (VerticalNews) -- By a News Reporter-Staff News Editor at Global Warming Focus -- According to news reporting originating from Alexandria, Virginia, by VerticalNews journalists, a patent by the inventors Nappa, Mario Joseph (Newark, DE); Lousenberg, Robert D. (Wilmington, DE); Jackson, Andrew (Newark, DE), filed on October 21, 2011, was published online on November 19, 2013.
The assignee for this patent, patent number 8586804, is E. I. du Pont de Nemours and Company (Wilmington, DE).
Reporters obtained the following quote from the background information supplied by the inventors: "This disclosure relates in general to methods of synthesis of chlorinated olefins.
"The fluorocarbon industry has been working for the past few decades to find replacement refrigerants for the ozone depleting chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) being phased out as a result of the Montreal Protocol. The solution for many applications has been the commercialization of hydrofluorocarbon (HFC) compounds for use as refrigerants, solvents, fire extinguishing agents, blowing agents and propellants. These new compounds, such as HFC refrigerants, HFC-134a and HFC-125 being the most widely used at this time, have zero ozone depletion potential and thus are not affected by the current regulatory phase-out as a result of the Montreal Protocol.
"In addition to ozone depleting concerns, global warming is another environmental concern in many of these applications. Thus, there is a need for compositions that meet both low ozone depletion standards as well as having low global warming potentials. Certain hydrofluoroolefins are believed to meet both goals. Thus there is a need for manufacturing processes that provide halogenated hydrocarbons and fluoroolefins that contain no chlorine that also have a low global warming potential.
"There is also considerable interest in developing new refrigerants with reduced global warming potential for the mobile air-conditioning market.
"HFC-1234yf (CF.sub.3CF.dbd.CH.sub.2) and HFC-1234ze (CF.sub.3CH.dbd.CHF), both having zero ozone depletion and low global warming potential, have been identified as potential refrigerants. U. S. Patent Publication No. 2006/0106263 A1 discloses the production of HFC-1234yf by a catalytic vapor phase dehydrofluorination of CF.sub.3CF.sub.2CH.sub.3 or CF.sub.3CHFCH.sub.2F, and of HFC-1234ze (mixture of E- and Z-isomers) by a catalytic vapor phase dehydrofluorination of CF.sub.3CH.sub.2CHF.sub.2.
"There is a continuing need for more selective and efficient manufacturing processes for the production of HFC-1234yf."
In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventors' summary information for this patent: "Disclosed is a process for the dehydrochlorination of 1,1,1,3-tetrachloropropane comprising contacting 1,1,1,3,tetrachloropropane in the vapor phase in a reaction zone with a catalyst comprising iron, to produce a product mixture comprising 1,1,3-trichloro-1-propene; and recovering said 1,1,3-trichloro-1-propene from the product mixture produced.
"In another embodiment, disclosed is a process for the dehydrochlorination of 1,1,1,3-tetrachloropropane comprising heating 1,1,1,3-tetrachloropropane in the liquid phase to a temperature of at least 175.degree. C. for at least one hour to produce a product mixture comprising 1,1,3-trichloro-1-propene, cooling said mixture, separating HCl from said product mixture, and recovering 1,1,3-trichloropropene.
"The foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as defined in the appended claims."
For more information, see this patent: Nappa, Mario Joseph; Lousenberg, Robert D.; Jackson, Andrew. Synthesis of 1,1,3-Trichloro-1-Propene. U.S. Patent Number 8586804, filed October 21, 2011, and published online on November 19, 2013. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=75&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=3714&f=G&l=50&co1=AND&d=PTXT&s1=20131119.PD.&OS=ISD/20131119&RS=ISD/20131119
Keywords for this news article include: Climate Change, Global Warming, Ozone Depletion, E. I. du Pont de Nemours and Company.
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