the inventive methods and products of the present invention will be described below in connection with operation of the apparatus illustrated in the figures . turning now to fig1 comestible products 10 are suspended in a smoke enclosure 12 which is provided with a fan 14 which recirculates heated air ( heater not shown ) through the smoking enclosure by way of an external conduit 16 . a virtually colorless refined liquid smoke vapor , produced as described hereinafter , is drawn from smoke regeneration apparatus 20 into conduit 16 at junction 18 by way of duct 22 leading from the smoke regeneration apparatus 20 . the refined vapor comprises a range of lower boiling point constituents of a conventional liquid smoke which are selectively volatilized as explained hereinafter . the ducts and conduits may be insulated ( not shown ) to minimize condensation of the vapor before it reaches the smoke enclosure . although the refined smoke vapor is conducted directly to the comestible products in smoke enclosure 12 in the figures , alternatively it may be conducted to a conventional condenser apparatus ( not shown ) and condensed into a refined liquid smoke condensate . the condensate will comprise a range of lower boiling point constituents of the starting liquid smoke determined or &# 34 ; tailored &# 34 ; by the volatilization temperature chosen in the regeneration method . this refined smoke condensate may later be applied directly to comestible products by dipping , coating , spraying , misting or volatilization techniques . smoke regeneration apparatus 20 includes an inlet tube 24 into which a conventional , commercially available liquid smoke 26 ( such as griffith laboratories &# 39 ; royal smoke a , b , c , d or h ) is metered . the inlet tube is positioned to introduce the liquid smoke into an optional , annular pre - heat well 28 which is most clearly illustrated in fig2 . the apparatus is provided with an open , inverted , truncated cone 30 which meets the inner edge of the pre - heat well about the upper edge 32 of the cone . both the well and the inverted cone are made of a heat conductive material such as stainless steel . during operation of the apparatus , the cone and well are heated by conventional electrical radiant heating coils 34 or by another practicable heating method . although the size and shape of the cone employed will vary depending on the smoking requirements of a particular installation , in the embodiment illustrated , the cone is about 10 inches high and about 2 3 / 4 and 4 inches respectively at the diameters of its lower and upper edges . liquid smoke 26 in well 28 is pre - heated to promote efficient volatilization as the liquid smoke overflows cone edge 32 onto inner surface 36 of cone 30 . the rate at which the pre - heated liquid flows onto the cone inner surface is dependent on the rate of metering of the liquid entering the apparatus through inlet tube 24 . the pre - heated liquid smoke overflowing edge 32 flows generally vertically down the inner surface 36 of the cone under the force of gravity . three brushes 40 rest within inverted cone 30 and are rotated by a motor , m , represented schematically at 42 , driving a shaft 44 . as the brushes rotate about the axis of shaft 44 the brush bristles contact inner surface 36 of the cone along most of its length , spreading and distributing the liquid smoke into a thin film as it spills over edge 32 . this brushing action , which is a function not only of the rate of rotation of the brushes but also of brush bristle stiffness and density , increases the residence time of the liquid smoke on surface 36 as it progresses down the surface toward exit point 38 at the lower cone edge . the brushing action also helps maintain maximum heat transfer , continuously removing tars which form on surface 36 so that they may advance downwardly toward the exit point and be readily washed away by the downwardly advancing liquid smoke . in addition , energy contributed by the mechanical action of the rotating brushes contributes to the volatilization of the liquid smoke . brushes 40 are mounted to arms 46 which in turn are mounted to shaft 44 in such a fashion that the brushes independently pivot at the point of attachment to the arms and at the point of attachment of the arms to the shaft , to precisely follow the angle of the inner surface of the inverted cone , under the bias of the centrifugal force of the rotating brushes . the choice of the brush bristles , including their composition , stiffness and bristle density , will be tailored to the operating parameters of the apparatus , including the cone temperature and the rate of rotation of the brushes . in addition , an alternative brush configuration could be used such as that in fig3 in which a single brush 52 with bristles 54 held in place on a twisted central shaft is illustrated . in this alternative embodiment bristles 54 are tapered to correspond to the taper of the cone inner surface 36 . apparatus 20 includes a vent 60 with damper 62 ( fig2 ) provided at the bottom of the smoke regeneration apparatus to permit control of an air flow opposite to the direction of the downwardly advancing liquid smoke . this counter flow of air carries the refined vapor up through the apparatus , to be drawn through conduit 16 to the smoking enclosure . additional air may be supplied at opening 63 through which shaft 44 passes . liquid smoke 26 may be any liquid smoke prepared by conventional methods such as those described in u . s . pat . nos . 3 , 873 , 741 or 3 , 106 , 473 . these and other commercially available liquid smoke products comprise aqueous - based mixtures of a great multitude of different organic compounds . for example , 41 different phenolic components in wood smoke and liquid smokes are identified in &# 34 ; the chemistry of smoked foods , a review &# 34 ;, by j . gilbert and m . e . knowles , j . f ., technol . ( 1975 ) 10 , 245 - 261 . in addition to these 41 , many other phenol , carbonyl and other compounds , both identified and unidentified , are present in liquid smoke . the lower boiling point constituents of liquid smoke , it has been found , contribute most of the desirable smokey flavor and coloring . the higher boiling point constituents , on the other hand , contribute undesirable harsh taste , minimal staining and highly adherent tars which interfere with heat transfer and are readily igniteable when hot . according to the method of the present invention , the lower boiling point constituents are selectively volatilized to the exclusion of the higher boiling point constituents ( and without burning the liquid smoke ), to obtain a refined vapor for imparting enhanced smokey flavor and color to comestible products . this selective volatilization is accomplished in the apparatus of fig1 by carefully controlling the heating of the liquid smoke , which is a function of the temperature of cone surface 36 , the rate of rotation and density of brushes 40 , and the rate at which the liquid smoke progresses down the cone surface . in particular , it has been found that the desired selective volatilization can be accomplished by monitoring the exit temperature of the residue 48 which drips off the cone at exit point 38 into tar reservoir 64 , and adjusting the heating by varying the above parameters to maintain the exit temperature at a level which will produce the desired refined smoke vapor . in the illustrated embodiment , the exit temperature is monitored with a thermocouple 66 ( fig2 ), although the exit temperature could be monitored in other conventional ways . it has been found that the objectives of the present invention including tailored smokey flavor and color of comestible products and elimination of tar build - up on the heated cone surface of the smoke regenerator can be accomplished by maintaining the exit temperature of residue 48 in the range of about 130 ° to 425 ° f ., and preferably in the range of about 180 ° to 375 ° f . an alternative liquid smoke regeneration apparatus 70 is illustrated in fig4 . again , the apparatus includes a liquid smoke inlet 72 , a duct 74 for conducting the refined vapor to the smoking enclosure , a motor 74 , a residue reservoir 76 and a dampered air inlet 78 . in this embodiment , however , the truncated cone 80 is inverted with its large end at the bottom and its top surface 82 and bottom surface 83 closed . liquid smoke 84 enters through inlet 72 onto top surface 82 where it is briefly pre - heated as it is moved by centrifigal force to the outer edge of the top surface and down the outer surface 86 of the cone . this structure differs most significantly from that of fig1 in that truncated cone 80 itself is rotated by a belt or other drive from motor 74 , brushes 88 are stationary and disposed against the outside of the cone , and heating means 94 is suspended inside the cone on a non - rotating parent shft 96 , which is disposed within outer shaft 98 . thus , unlike in the prior embodiment , here the liquid smoke flows down the cone outer surface 86 as it is spread and distributed by the action of brushes 88 . brushes 88 are pivotally attached to the outer wall 90 of the regenerator enclosure , as illustrated in fig6 and biased against the outer cone surface 86 by springs 92 . as in the case of the fig1 a thermocouple 100 is located adjacent the bottom edge of the cone to monitor the exit temperature of the residue . while the present invention is described above , the invention is intended to cover any alternatives , modifications or equivalents that may be included within its sphere and scope , as defined by the appended claims .
an apparatus for regenerating liquid smoke into vapor comprising a regenerator chamber , a regenerator member with generally vertical surfaces within the chamber , means for introducing and spreading liquid smoke on the surface , and means for heating the member to regenerate the liquid smoke into vapor .