Photochlorination of partially-chlorinated chloromethanes to carbon tetrachloride
AssigneeOccidental Chemical Corporation
InventorsRobert L. Zeller, III, Darrell G. Hollis, Keith S. Kramer, Brian Calderwood, Rodney L. Klausmeyer, John L. Dawkins
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Abstract
A method of producing carbon tetrachloride includes providing a chloromethanes stream, combining the chloromethanes stream with chlorine and additional carbon tetrachloride to form a reaction mixture, wherein the reaction mixture includes at least stoichiometric levels of chlorine, introducing electromagnetic radiation to the reaction mixture and subjecting the reaction mixture to suitable reaction conditions to form product carbon tetrachloride, and collecting a product stream including the product carbon tetrachloride.
Claims20
A method of producing carbon tetrachloride, the method comprising steps of:
- (i) providing a chloromethanes stream including chloroform, initial carbon tetrachloride, and at least one of methyl chloride and methylene chloride, wherein the chloromethanes stream includes from about 99.0 to about 100 wt. %, of the chloroform, the initial carbon tetrachloride, and the at least one of methyl chloride and methylene chloride;
- (ii) combining the chloromethanes stream with chlorine and additional carbon tetrachloride to form a reaction mixture, wherein the reaction mixture includes at least stoichiometric levels of chlorine relative to the chloroform and the at least one of methyl chloride and methylene chloride;
- (iii) introducing electromagnetic radiation to the reaction mixture and subjecting the reaction mixture to conditions suitable for reacting the chlorine with the chloroform and the at least one of methyl chloride and methylene chloride to thereby form product carbon tetrachloride;
- (iv) collecting a product stream after step (iii);
- and
- (v) combining the product stream with an olefin, a catalyst, and a chelating agent to thereby react the carbon tetrachloride in the product stream with the olefin;
- wherein the method is devoid of a step of removing organic compounds from the product stream between steps (iv) and (v).
A method of producing carbon tetrachloride, the method comprising steps of:
- (i) providing a chloromethanes stream including chloroform, initial carbon tetrachloride, methyl chloride, and methylene chloride, wherein the chloromethanes stream includes from about 99.5 to about 100 wt. %, of the chloroform, the initial carbon tetrachloride, the methyl chloride, and the methylene chloride;
- (ii) combining the chloromethanes stream with chlorine and additional carbon tetrachloride to form a reaction mixture, wherein the reaction mixture includes at least stoichiometric levels of chlorine relative to the chloroform, the methyl chloride, and the methylene chloride;
- (iii) introducing electromagnetic radiation to the reaction mixture and subjecting the reaction mixture to conditions suitable for reacting the chlorine with the chloroform, the methyl chloride, and the methylene chloride to thereby form product carbon tetrachloride;
- (iv) collecting a product stream after step (iii);
- and
- (v) combining the product stream with an olefin, a catalyst, and a chelating agent to thereby react the carbon tetrachloride in the product stream with the olefin.
A method of producing carbon tetrachloride, the method comprising steps of:
- (i) providing a chloromethanes stream including chloroform, initial carbon tetrachloride, and at least one of methyl chloride and methylene chloride, wherein the chloromethanes stream includes from about 99.0 to about 100 wt. %, of the chloroform, the initial carbon tetrachloride, and the at least one of methyl chloride and methylene chloride;
- (ii) combining the chloromethanes stream with chlorine and additional carbon tetrachloride to form a reaction mixture, wherein the reaction mixture includes at least stoichiometric levels of chlorine relative to the chloroform and the at least one of methyl chloride and methylene chloride, wherein the concentration of the chloroform and the at least one of methyl chloride and methylene chloride in the reaction mixture is less than 50,000 ppm by weight relative to the weight of the reaction mixture;
- (iii) introducing electromagnetic radiation to the reaction mixture and subjecting the reaction mixture to conditions suitable for reacting the chlorine with the chloroform and the at least one of methyl chloride and methylene chloride to thereby form product carbon tetrachloride;
- and
- (iv) collecting a product stream after step (iii), wherein the product stream includes less than 1,000 ppm (parts per million by weight) of chlorinated hydrocarbons other than carbon tetrachloride.
Dependencies are inferred from the claim text.