Method for Off-Gasing Purified Gases in a Melting Device

Abstract

A method for producing a purified product stream is disclosed. A process stream is provided to a screw compressor, the process stream comprising a contact liquid stream and a product stream, wherein the product stream comprises a solid portion. The process stream is passed through the screw compressor and into a melting device. The solid portion of the product stream is melted in the melting device to a temperature and a pressure such that a portion of the product stream vaporizes, forming a purified product stream, and vaporization of the contact liquid stream into the purified product stream is essentially prevented. A restricted outlet is provided to an upper portion of the vessel. The restricted outlet is proportionally controlled such that the pressure and the temperature is maintained as the purified product stream passes through the restricted outlet. In this manner, the purified product stream is produced.

1 . A method for producing a purified product stream comprising:
 providing a process stream to a screw compressor, the process stream comprising a contact liquid stream and a product stream, wherein the product stream comprises a solid portion;   passing the process stream through the screw compressor and into a melting device;   melting the solid portion of the product stream in the melting device to a temperature and a pressure such that:
 a portion of the product stream vaporizes, forming a purified product stream; and, 
 vaporization of the contact liquid stream into the purified product stream is essentially prevented; 
   providing a restricted outlet to an upper portion of the vessel;   proportionally controlling the restricted outlet such that the pressure and the temperature is maintained as the purified product stream passes through the restricted outlet;   
       whereby the purified product stream is produced. 
     
     
         2 . The method of  claim 1 , providing the product stream further comprising carbon dioxide, nitrogen oxide, sulfur dioxide, nitrogen dioxide, sulfur trioxide, hydrogen sulfide, hydrogen cyanide, water, condensed hydrocarbons, or combinations thereof. 
     
     
         3 . The method of  claim 1 , providing the screw compressor comprising a connection to the melting device above a level of the process stream. 
     
     
         4 . The method of  claim 1 , providing the screw compressor comprising a connection to the melting device below a level of the process stream. 
     
     
         5 . The method of  claim 1 , providing the restricted outlet comprising a valve, a compressor, a pump, or a combination thereof. 
     
     
         6 . The method of  claim 5 , providing the vessel further comprising a pressure sensor, an output of the pressure sensor transmitting the pressure. 
     
     
         7 . The method of  claim 6 , wherein the proportionally controlling step is accomplished by opening or closing the restricted outlet proportional to the pressure. 
     
     
         8 . The method of  claim 7 , providing the vessel further comprising a level sensor, an output of the level sensor transmitting a liquid level. 
     
     
         9 . The method of  claim 8 , further comprising maintaining the liquid level of the process stream in the melting device by the output of the level sensor. 
     
     
         10 . The method of  claim 9 , further comprising providing a controller, the controller receiving the output of the pressure sensor and the output of the level sensor and controlling the restricted outlet and the liquid level. 
     
     
         11 . The method of  claim 1 , providing the melting device comprising a shell and tube style heat exchanger, plate style heat exchanger, plate and frame style heat exchanger, plate and shell style heat exchanger, spiral style heat exchanger, plate fin style heat exchanger, or combinations thereof. 
     
     
         12 . The method of  claim 1 , providing the contact liquid stream comprising any compound or mixture of compounds with a freezing point below the temperature at which the product stream solidifies. 
     
     
         13 . The method of  claim 1 , providing the contact liquid stream comprising water, brine, hydrocarbons, liquid ammonia, liquid carbon dioxide, other cryogenic liquids, other hydrocarbons, and combinations thereof. 
     
     
         14 . The method of  claim 1 , providing the contact liquid stream comprising 1,1,3-trimethylcyclopentane, 1,4-pentadiene, 1,5-hexadiene, 1-butene, 1-methyl-1-ethylcyclopentane, 1-pentene, 3,3,3,3-tetrafluoropropene, 3,3-dimethyl-1-butene, 3-chloro-1,1,1,2-tetrafluoroethane, 3-methylpentane, 3-methyl-1,4-pentadiene, 3-methyl-1-butene, 3-methyl-1-pentene, 3-methylpentane, 5-methyl-1-hexene, 5-methyl-1-pentene, 5-methylcyclopentene, 5-methyl-trans-2-pentene, bromochlorodifluoromethane, bromodifluoromethane, bromotrifluoroethylene, chlorotrifluoroethylene, cis 3-hexene, cis-1,3-pentadiene, cis-2-hexene, cis-2-pentene, dichlorodifluoromethane, difluoromethyl ether, trifluoromethyl ether, dimethyl ether, ethyl fluoride, ethyl mercaptan, hexafluoropropylene, isobutane, isobutene, isobutyl mercaptan, isopentane, isoprene, methyl isopropyl ether, methylcyclohexane, methylcyclopentane, methylcyclopropane, n,n-diethylmethylamine, octafluoropropane, pentafluoroethyl trifluorovinyl ether, propane, sec-butyl mercaptan, trans-2-pentene, trifluoromethyl trifluorovinyl ether, vinyl chloride, bromotrifluoromethane, chlorodifluoromethane, dimethyl silane, ketene, methyl silane, perchloryl fluoride, propylene, vinyl fluoride, or combinations thereof. 
     
     
         15 . The method of  claim 1 , providing the process stream further comprising a solid portion comprising particulates, mercury, other heavy metals, condensed organics, soot, inorganic ash components, biomass, salts, water ice, frozen acid gases, other impurities common to a vitiated flow, the producer gases, or the other industrial flows, or combinations thereof. 
     
     
         16 . The method of  claim 1 , further comprising providing the purified product stream to a pure liquid product stream to condense the purified product stream into the pure liquid product stream. 
     
     
         17 . The method of  claim 1 , further comprising cooling the purified product stream in a heat exchanger, producing a cooled purified product stream. 
     
     
         18 . The method of  claim 17 , further comprising compressing the cooled purified product stream into a liquid phase, producing a liquefied pure product stream. 
     
     
         19 . The method of  claim 18 , further comprising passing the liquefied pure product stream through a heat exchanger. 
     
     
         20 . The method of  claim 1 , providing the screw compressor further comprising porous walls through which a portion of the contact liquid stream is removed.