Patents by Inventor Francis E. Evans
Francis E. Evans has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 4943423Abstract: The present invention provides a process for recovering boron trifluoride from an impure gaseous boron trifluoride residue. The process comprises: (a) feeding an impure gaseous boron trifluoride residue containing sulfur dioxide as an impurity into a mixture of boric and sulfuric acids wherein the acid mixture absorbs boron trifluoride from the impure boron trifluoride residue and slightly absorbs or does not absorb sulfur dioxide from the impure gaseous boron trifluoride residue; and (b) removing the unabsorbed sulfur dioxide from the acid mixture.The present invention also provides a boron trifluoride preparation and purification process.Type: GrantFiled: November 29, 1988Date of Patent: July 24, 1990Assignee: Allied-Signal Inc.Inventors: Francis E. Evans, Kenneth H. Schroeder, William J. Wagner
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Patent number: 4781909Abstract: Sulfuric acid contaminated with boron and fluoride values such as the waste acid of a boron trifluoride process is purified by contacting the contaminated acid with an inert gas to desorb boron trifluoride, and the inert gas is stripped by contacting with an absorbing liquid including concentrated sulfuric acid. Hydrogen fluoride and/or fluorosulfuric acid are added to contaminated sulfuric acid as agents to spring non-volatile boron value. In addition, the water content of the contaminated acid is adjusted within a narrow concentration range, to improve the efficiency of both the stripping and the absorption operations. The absorption of boron trifluoride into the absorbing sulfuric acid is improved when it contains boric acid. Preferably the contaminated sulfuric acid to be purified is one portion of the waste liquid and the absorbing liquid is another portion of the waste liquid of a boron trifluoride manufacturing process.Type: GrantFiled: May 19, 1986Date of Patent: November 1, 1988Assignee: Allied-Signal Inc.Inventors: Francis E. Evans, Joel P. Guptill
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Patent number: 4371707Abstract: A process for the conversion of boron trifluoride dimethyl ether complex to boron trifluoride dialkyl ether complex substantially free of dimethyl ether impurities, which comprises reacting the boron trifluoride-dimethyl ether complex, in the liquid phase, in the presence of dialkyl ether wherein at least one of the alkyl groups contains at least two carbon atoms, in a restricted vapor equilibration region, while simultaneously sweeping the said vapor equilibration region with a substantially inert gas, and heating to distill off the dimethyl ether. High purity of the boron trifluoride dialkyl ether complex is attained with this method, with only minimal traces of the boron trifluoride dimethyl ether complex, dimethyl ether remaining. The preferred product is boron trifluoride diethyl ether.Type: GrantFiled: December 15, 1980Date of Patent: February 1, 1983Assignee: Allied CorporationInventors: Richard E. Eibeck, Martin A. Robinson, Francis E. Evans, Eugene B. Recla
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Patent number: 4265871Abstract: Sulfuric acid contaminated with boron and fluoride values such as the waste acid of a boron trifluoride process is purified by contacting the contaminated acid with an inert gas to desorb boron trifluoride, and the inert gas is stripped by contacting with an absorbing liquid including concentrated sulfuric acid. Fluosulfonic acid is added to contaminated sulfuric acid at levels approximately three times the molar values of boric acid contaminant as an agent to spring non-volatile boron values. The absorption of boron trifluoride into the absorbing sulfuric acid is improved when it contains boric acid. Preferably the contaminated sulfuric acid to be purified is one portion of the waste liquid and the absorbing liquid is another portion of the waste liquid of a boron trifluoride manufacturing process. Boric acid is added to the absorbing liquid, then boron trifluoride is stripped from the inert gas and absorbed into the absorbing liquid.Type: GrantFiled: May 7, 1979Date of Patent: May 5, 1981Assignee: Allied Chemical CorporationInventors: Charles J. Felice, Jr., Francis E. Evans, Martin A. Robinson, Richard E. Eibeck
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Patent number: 4227027Abstract: When saturated with boron trifluoride, certain polyhydric alcohols form adducts which catalyze hydrocarbon alkyl transfer reactions for which boron trifluoride is catalytic. The adduct is recovered from the reaction mixture and recycled, greatly reducing boron and fluoride values in the product and in any effluent. Examples include propylation of toluene in the presence of a recycled adduct of boron trifluoride with mannitol or sorbitol, and the oligomerization of decene by a recycled adduct of boron trifluoride with mannitol or butanediol. Some of the catalysts become viscous on cooling and are thus more easily separated from the reaction products which remain in a separate liquid phase.Type: GrantFiled: November 23, 1979Date of Patent: October 7, 1980Assignee: Allied Chemical CorporationInventors: Robert E. Booth, Francis E. Evans, Richard E. Eibeck, Martin A. Robinson
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Patent number: 4216168Abstract: High purity tetrahydrocarbylammonium tetrahydridoborates are prepared under anhydrous conditions by reacting tetrahydrocarbylammonium salts with at least 8% molar excess of an alkali metal hydroxide in the presence of ethanol to produce the corresponding tetrahydrocarbylammonium hydroxides and alkali metal salts, removing the alkali metal salts and adding an alkali metal borohydride to the solution to produce the corresponding tetrahydrocarbylammonium tetrahydridoborates and alkali metal hydroxides.Type: GrantFiled: October 16, 1978Date of Patent: August 5, 1980Assignee: Allied Chemical CorporationInventors: Francis E. Evans, Charles J. Lind, Martin A. Robinson
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Patent number: 4209654Abstract: When saturated with boron trifluoride, certain polyhydric alcohols form adducts which catalyze reactions for which boron trifluoride is catalytic. The adduct is recovered from the reaction mixture and recycled, greatly reducing boron and fluoride values in the product and in any effluent. Examples include propylation of toluene in the presence of a recycled adduct of boron trifluoride with mannitol or sorbitol.Type: GrantFiled: October 16, 1978Date of Patent: June 24, 1980Assignee: Allied Chemical CorporationInventors: Robert E. Booth, Francis E. Evans, Richard E. Eibeck, Martin A. Robinson
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Patent number: 4174349Abstract: Fluoroorganic compounds are prepared by reacting a haloorganic starting material in which at least one halo atom is replaceable with a fluorine atom by metathetical exchange, with calcium fluoride in the presence of a crown ether and an anhydrous, polar, basic organic solvent which complexes with the calcium ion and contains no --OH groups, at a temperature and for a period of time adequate to effect fluorination.Type: GrantFiled: October 30, 1978Date of Patent: November 13, 1979Assignee: Allied Chemical CorporationInventors: Francis E. Evans, Morris B. Berenbaum, Richard E. Eibeck, Martin A. Robinson
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Patent number: 4157377Abstract: Dry calcium fluoborate suitable for use in the manufacture of boron trifluoride is produced by reacting, in an aqueous medium, calcium fluoride, hydrofluoric acid and boric acid followed by removing water from the calcium fluoborate reaction product by purging the reaction product with a dry inert gas such as nitrogen, at a temperature between about 140.degree. to 160.degree. C.Type: GrantFiled: September 5, 1978Date of Patent: June 5, 1979Assignee: Allied Chemical CorporationInventors: Francis E. Evans, Charles J. Lind, Richard E. Eibeck, Martin A. Robinson
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Patent number: 4072027Abstract: A stabilized heat exchange medium is disclosed including a fluorocarbon, an absorbant and a tribasic phosphite stabilizer. The preferred absorbants are assymetrical furan derivatives containing at least 1 oxygen with a single bond to an adjacent carbon, and is most preferably an alkyl tetrahydrofurfuryl ether. The fluorocarbon contains 1 or 2 carbons, 1 or 2 hydrogens and the remainder chlorine and fluorine. The tribasic phosphites are of the formula (R.sub.1 'O)(R.sub.2 'O)(R.sub.3 'O)P, wherein R.sub.1 ', R.sub.2 ' and R.sub.3 ' are each independently alkyl, alkenyl, phenyl, alkylene phenyl, alkylene alkylphenyl or alkylphenyl.Type: GrantFiled: January 19, 1977Date of Patent: February 7, 1978Assignee: Allied Chemical CorporationInventors: Morris B. Berenbaum, Francis E. Evans, Richard E. Eibeck, Martin A. Robinson
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Patent number: 3956236Abstract: A composition for increasing flame resistance of a step-reaction polymer comprising a metal salt of certain organic acids in combination with certain organic acids or their ammonium salts, the method of treating the step-reaction polymer with the composition and the resulting treated polymer.Type: GrantFiled: April 29, 1974Date of Patent: May 11, 1976Assignee: Allied Chemical CorporationInventors: Francis E. Evans, Kenneth B. Gilleo
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Patent number: 3943100Abstract: A flame resistant organic polymer which decomposes into fragments containing acidic and/or basic groups and the process for making same comprising treating an organic polymer which decomposes into said fragments with from about 0.5 to about 25 weight percent of a compound which contains at least one functional radical selected from --0--, --S-- and --N-- and at least one carboxyl or mercapto group which is able to dissociate in water to provide a free positively charged ion.Type: GrantFiled: December 17, 1973Date of Patent: March 9, 1976Assignee: Allied Chemical CorporationInventors: Morris B. Berenbaum, Kenneth B. Gilleo, Francis E. Evans