sample="quota" bates="502878463" isource="rjr" decade="1970" class="ui" date="19720127" Lowery, G. R. 237151-237200 G-13 A rotating screen was installed in the 24" cooker in 611-7 and made ready for initial testing on OCT 20 1970. The object of the screen is to provide a means of drawing a portion of the impregnating pool out of the cooker for the purpose of removing nicotine from the extract. Previous attempts to denicotinize tobacco in conjunction with the G-13 process resulted in either drawing off a considerable amount of tobacco along with the extract & solvent or having a fixed screen, or filter, quickly blind. the sketch below illustrates the use of the self cleaning screen when used in conjunction with the G-13N system: The equipment used for these experiments was a 24" I.D. impregnater containing a screw impeller consisting of 20 flights. Screw speed can be varied from 1/2 RPM to 2 RPM These speeds permit a residence time in the first cooker of 10' to 40'. The second cooker is 18" I.D. and contains a similar screw impeller with speed adjustment from 3/4 RPM (15' dwell time) to 2 RPM (40' dwell time) The principle of operation is to insert tobacco into the 24" cooker through an air lock (rotary type). The cooker contains a pool of hot solvent & pressure greater than atmosphere. The tobacco is dropped from the cooker into a hot vapor stream through a second rotary air lock. (This portion is common to the regular G-13 process) A portion of the solvent pool is drawn off through the rotary draw-off screen & passed through a pump. Downstream from the pump a portion of the stream is diverted to back wash the rotary screen while the remainder is processed through a mild acid bath for denicotinization & returned into the cooker. Initial trails resulted in damage to the screen causing it to be removed for repair. The screen was reinstalled & made ready for trail on 2-24-71. 2-26-'71 - The purpose of this test is to determine the upper feed rate limits of the G-13N system of 611-7 and to determine the conditions necessary to process tobacco with the higher feed rate. This test is identified as D-7. CONDITIONS: RESULTS No choke-ups were experienced during 1 hr feed time. Filling capacity- 880@13% moisture, nicotine in H-20 extract before acid treatment- 0.04%, nicotine in H-20 extract after acid treatment - 0% 2-26-71 D-8 500# of CF tobacco was fed through the G-13N system at a feed rate of 5#per. min. to evaluate the equipment & conditions at a higher feed rate. Conditions were: RESULT: No choke-ups were experienced during 100 min. feed time, H-20 extract into acid bath 0.07% nicotine, H-20 after acid bath 0.0% nicotine. Nicotine in feed 2.26%, nicotine in product - 1.93%, percent nicotine removed 14.6%. 3-2-'71 In order to study the upper limits of the G-13N processing system in 611-7 and the conditions required to G-13N process tobacco at higher feed rates, 500# of CF tobacco was fed through the system at 7# per min. CONDITIONS: RESULT - At the start of the feed a choke-up occurred at the hopper for the inlet air lock. No other choke-ups were experienced during this run. Nicotine percent in feed tobacco 2.16%, nicotine percent in product 1.93%, percent removal 10.7%. 3-4-'71 To continue the study of the effect of higer feed rates in the G-13N processing system of 611-7. 500# of CF tobacco was fed through the processing system at a feed rate of 8# per min. Conditions were: RESULT. A choke-up occurred in the 18" cooker at the discharge transition to the air-lock. No data was obtained from tobacco as H-20 during this test. 2 lines crossed out, says "not used" 3-10-71 Test No. D-10 was repeated feeding 500# of CF tobacco through the G-13N system at 611-7 at a rate of 8# per min. The screw speed in the 18" cooker was reduced from 3/4 RPM to 1/2 RPM to reduce the load on the outlet air lock as the screw flight passed over the transition. The airlock speed was changed from about 5 RPM to 8 1/2 RPM. Other conditions were as follows: RESULT A choke-up occurred in the separater during the start up period, however tobacco was fed at 8#/min for about 1 hour with no further difficulty. Faulty circuit breakers on the acid pump caused the nioctine removal data to be unreliable. 11 lines crossed out, says "not used" twice SIGNATURE AND DATE 3-10-71 READ AND UNDERSTOOD Form 834 R.J. REYNOLDS TOBACCO COMPANY RESEARCH AND DEVELOPMENT DEPARTMENTS Job No. 2357 Date 12/16/71 Subject A METHOD OF REDUCING THE RESIDUAL H-20 IN G-13 PROCESSED TOBACCO 237156 The following experiments were conducted with the MOHR tobacco conditioner in 611-4 to determine the effect of using vacuum and/or air cycled with steam as a method of reducing the H-20 content of G-13 processed tobacco. The experiments were conducted on common blend processed @601 on 12/16/71 The treatment used for the first cycle consisted of placing a G-13 filler can with approx. 150# of G-13 processed tobacco in the MOHR unit. The chamber was sealed & 30" of vacuum was drawn for 15'. The vacuum was broken by admitting room air (70º@65%rh). Tobacco samples were taken before & after treatment & subjected to H-20 analysis data are: H-20% Filling Capacity (ML/100gm) Before cycle 2.3 774 After cycle 2.5 808 (Valves are approx. due to small sample size) A second filler can of approx 150# of G-13 was placed in the chamber & 30" of VACUUM DRAWN for 15'. Steam was then introduced into the chamber (thru the probe& into the chamber) until the vacuum was reduced to 23". Steam was shut off & vacuum returned to 30". (Tobacco temp.@ end of cycle was 96º F) Data are H-20% Filling Capacity (ML/100gm) Before cycle 2.5 666 After cycle 0.11 550 4 lines crossed out, says "not used" A third cycle was run by placing a G-13 filler can with approx. 150# of G-13 in the MOHR unit & sealed. A thermocouple, attached to a temperature chart recorder, was placed in the tobacco about 6" below the surface & in the center of the can. A 30" vacuum was drawn for 15' & steam was inserted into the chamber until the temperature of the tobacco had risen to 120º F. Steam was then cut off & vacuum again drawn until the temperature had dropped to 90º F. DATA ARE: H-20% FILLING CAPACITY BEFORE AFTER BEFORE AFTER 1.3% 0.99% 794ML/100gm 722 ML/100 gm (figures are approximate due to small sample size) The following cycles were repeated on the MOHR tobacco conditioner@611-4 using approx. 150# batches of common blend in G-13 filler cans. The cycle consisted of: Step (1) Place G-13 can in the MOHR UNIT & seal (2) Draw a vacuum to 30" (Approx. 6 min.) (3) Insert steam until the temperature of the tobacco has risen to 120º F & hold for 6 min. (4) Evacuate to 30" of vacuum & hold until the temperature of the tobacco is reduced to 90º F. DATA ARE: BEFORE TREATMENT AFTER TREATMENT FILLING CAPACITY H-20% FILLING CAPACITY H-20% 813 ML/100 gm 1.12% 658 ML/100 gm 0.39% 1 line crossed out, says "not used" To evaluate a longer holding time at the high temperature the next cycle consisted of (1) place approx. 150# of G-13 (in a G-13 filler can) in the MOHR UNIT & seal the chamber (2) draw 30' vacuum on the chamber (3) allow steam to enter the chamber until the temperature of the tobacco rises to 120º F & hold for 9'. (3) Evacuate the chamber until the temperature is reduced to 90º F. DATA ARE: BEFORE TREATMENT AFTER TREATMENT FILLING CAPACITY 808 ML/100 gm 636 ML/100 gm H-20% 1.07 0.19 To study the effect of steam/vacuum cycles on survey. Approx. 150# of KF (in a G-13 filler can) was placed in the MOHR UNIT & sealed. (1) The chamber was then evacuated to 30" for 15'. (2) vacuum was then broken with room air(70º@65%RH). Results were then evaluated. DATA ARE: BEFORE TREATMENT AFTER TREATMENT FILLING CAPACITY 592 ML/100 gm 622 ML/100 gm H-20% 0.34 0.40 Approximately 150# of KF (in a G-13 filler can) was then place in the MOHR UNIT & the chamber sealed.(1) Vacuum was drawn to 30". (2) Steam was injected into the chamber until the tobacco temperature reached 120ºF. & held for 6'. (3) Vacuum was then drawn until the tobacco temperature was reduced to 90ºF. DATA ARE: BEFORE TREATMENT AFTER TREATMENT FILLING CAPACITY 597 ML/100 gm 497 ML/100 gm H20% 0.34% 0.12% This test was repeated except the temperature was held at 130ºF for 6' instead of 120ºF. DATA ARE: BEFORE TREATMENT AFTER TREATMENT FILLING CAPACITY 626 ML/100 gm 481 ML/100 gm H-20% 0.35 0.09 To evaluate the effect of a warm moist flow of air as a means of H-20 removal from G-13 processed tobacco a box was constructed, with a perforated bottom, to hold approximately 100# of G-13 processed tobacco. A pump was attached (as per the sketch) to induce a flow of air thru the tobacco. DATA ARE: NOTE: As a control, a similar box was placed near the test box using only the air flow that may have been induced by gravity. Tobacco was common blend processed on 1/11 on 601 processing. 5 lines crossed out, says "not used" In order to determine what effect the application of G-2 would have on the rate of escape of H-20 from G-13 processed tobacco approximately -100# of G-13 was placed in the test & control boxes described on PP.237159 & the test repeated except that the tobacco had 2.06% (by weight) alcohol on it. DATA ARE: TERMINATED 2/4/72 due to change in RH. half of line crossed out 18 lines crossed out, says "not used" 3 times SIGNATURE AND DATE: 1/31/72 READ AND UNDERSTOOD FORM 834 R.J. REYNOLDS TOBACCO COMPANY RESEARCH AND DEVELOPMENT DEPARTMENTS Job No. Date 237161 entire page crossed out with one diagonal stroke, says "void" SIGNATURE AND DATE READ AND UNDERSTOOD 237021--237250 RJR FOODS Frank, G.L. 237301-237350 Eastman Barrier Wrap