DE1949338A1 - Process for the treatment of tobacco and the device for its implementation - Google Patents

Description

Philip Morris Incorporated 100 Park Avenue, Ksw York, N.Y. 10017 * V.St.A.

Method for treating tobacco and device for βeiner

execution

The distillery of tobacco and its aroma and composition of tobacco smoke depend to a very substantial extent on the water-soluble, ionizable substances found in the tobacco Substances that have been shown to be mainly metal salts. The metal ions present in tobacco direct how has been shown, the burning speed and the burning character of tobacco. The nature of the ash also depends, at least in part, on the metal ions and their proportions, which in turn has an impact on the combustion. So the formation of a porous ash leads to a steady combustion while the presence of a low-smelling metal salt in excess a premature suffocation of the embers under this accompanying Formation of covering and irritating smoke components and a non-porous, the air passage through the tabsk inhibiting carbon product.

AIo the most prominent source for the premature Extinction of tobacco charcoal is the presence of a high

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Proportion of low-melting mineral salts, d. H. of melting in the temperature range of 316 Ms 454 ° C (600 "to 850 ° P) Salts in which tobacco has been found. This premature asphyxiation results in unburned carbon, making the ashes is dark or black in color.

It has been found that a satisfactory, essentially complete tobacco burning is feasible if the proportion of low-melting mineral salts in the ashes is below the Amount is to be absorbed by other ash components, such as Calcium carbonate, magnesium carbonate or calcium phosphate are.

Among the top leaf tobacco varieties are the low-melting ones Salts in such amounts that one obtains an excellent combustion and thus with an egg tobacco naturally an excellent, subjective smoking behavior of tobacco products can achieve »With many types of poorly burning tobacco and with But eats stalks and other minor tobacco products the proportion of low-melting salts so laugh * that there is no forms a pure, porous carbon structure. When burning such inferior Tobacco types come under the formation of Rauehs3 Carbohydrate structural elements and other main components of the combustible, organic material in the inconsistently burning mass alternately between extinguishing and igniting.

So far, ketallion components in tobacco are due to the addition of metal salts to the tobacco leaf This technique results in an increase in the concentration of one or more ions, but does not lead to partial or complete exchange a certain metal ion or even minimal reduction the concentration of a particular ion, both of which would often be desirable.

Washing tobacco with Vassor will remove some

BADORIGJNAt.

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laudable salts, mainly potassium salts, from tobacco. In this case, however, the removal of desired, water-soluble constituents cannot be avoided.

The treatment of the extraction of ground tobacco using acidic ion exchange ores for the purpose of solubilization of pectins and their removal from the tobacco Nassere is described in TJSA Patent 3,385,303. This treatment proceeds with the removal of ions from the insoluble pectin-carbohydrate structure and results in however, removing some ions that can later be replaced also leads to the solubility of the pectins, so that these be removed or at least subject to a rearrangement in the tobacco. In contrast to this, the method according to FIG Invention on the removal of water-soluble Ions are shut off, and it is desirable for the purposes of the invention to keep the pectins undisturbed during the ion adjustment step to let, since such pectins represent building materials in the tobacco, which act as "glue" for binding other constituents to serve.

Certain polyvalent metal ions are made from tobacco by treatment of the slurried, ground. Tobacco with the desired salts or acids have been removed in such a way that the ions, such as calcium or magnesium, are converted into insoluble salts and passed through a monovalent ketallic ion or by a yeastic ion in the treating agent be replaced. It has been shown dees too such a treatment to dissolve the tobacco pectins and their removal from, or at least their rearrangement in the Tobacco structure leads. As discussed above, it is desirable, however, to leave the pectins undisturbed during the ion concentration process, because such pectins as "Le: m" represent building materials serving to bind other constituents in tobacco.

The process of the Z _A 'i'inc ung allows metal ions from

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Tobacco parts selectively and without simultaneous solubilization of the Remove tobacco pectins. The ions can then be in each replaced by other ions or left in the acid form as desired. In the case of the ancestor according to the invention to improve the burning properties of tobacco, the aroma of tobacco smoke and the quality of tobacco ash by controlling the ionic content of the tobacco

1. by bringing together parts of tobacco plants with Wasaer aqueous tobacco extract obtained,

2. by treating the extract its content of certain Metal ions adjusted without removing the desired tobacco components and

3. the treated, aqueous tobacco extract again with the extracted Tobacco parts united.

To adjust the ion content of the aqueous tobacco extract, the extract can be combined with an ion exchange resin or subject the extract to membrane electrodialysis. If desired, one can further improve the The tobacco end product to the treated tobacco plant parts other ions.

According to one embodiment of the invention, tobacco plant parts are extracted with water and then treated the aqueous extract with an ion exchange resin to determine the amount Ions in the aqueous tobacco lounges decrease or such To eliminate ions from the solution at all. The extract will then, if desired, with a :? Solution united, the guided Contains amounts of other ions, and the resulting mixture is combined again with the extracted tobacco parts.

As an alternative to the ion exchange treatment, the aqueous extract can also be subjected to membrane electrolysis in order to achieve certain To remove ions completely or partially from the solution.

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- J J ':

It has been found that removal of the metal ions present in the tobacco as water-soluble, low-melting salts, ie salts melting at about 310 to 460 ° C (about 600 to 850 ° P), to a degree as high as 90 ° and up to 95 io and a replacement of such ions by ammonium, hydrogen, calcium or magnesium ions is desirable. Removal of potassium ions and replacement of the potassium ions in the tobacco with ammonium, hydrogen, calcium or magnesium ions is particularly desirable. Such an ion replacement leads, as eich has shown, to better and stronger ash when smoking the tobacco treated in this way. It has been found desirable to remove at least 20 # of the potassium ions or similar ions and replace them with ammonium, hydrogen, calcium or magnesium ions.

There are many results in controlling the ionic content of tobacco achievable. By cutting the potassium! On content of Tobacco at a low value can cause the undesirable slab properties resulting from salts having low melting points eliminate them. By removing nitrate ions, a slower burning product can be achieved and the occurrence Eliminate sudden bursts of rapid burns while you are under certain conditions, on the other hand, also increase the content and in this way achieve a faster-burning tobacco can. In a preferred way one leads into the tobacco Achieving a pleasant ("siiooth") aroma ammonium ion. Phosphate or chloride ions can be added to tobacco to delay burning. A"! Chloride ion removal can be done to increase the burning speed of the tobacco. Of the The ion content can be changed in such a way that the tobacco has an acidic, neutral or alkaline pH value when it is wet. An ion exchange can be carried out with little or no net effect on the nicotine content, although this is not always possible either. Through the appointment of the ion content, the burning speed

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speed, the products of combustion, the formation of ash, the appearance and other properties of the tobacco in the desired one Steer degree and will get a product that is compared to the original tobacco or one from this without adjustment the ion content produced product is improved.

The present invention enables this result to be achieved effectively. In the present example, treated tobacco has a better and guided burning rate _t more desirable combustion products, a better ash quality and a better appearance of the ash

A Ueg to carry out the ¹ selective ion steering according to the invention after extracting the Tebakteile z. B. tobacco leaves, stalks or dust and have preferably been ground or pulverized, with water consists in treating the extract with an ion exchange resin or with several such resins in an additional treatment. The treated extract can then be divided (titrated) and also combined with the desired additives and reunited with the extracted parts. V ^r ann the VereinigungBprodukt a slurry or represents a dough, it can be after all the known methods, for. B. by its or roller application or according to paper production techniques, transferred into a layer or folio of reconstituted tobacco.

W & ssrige extract is contacted with a lonenauniauaehharz in the removal of about 20 to 95 wt. ^ Of sufficient amount in the tobacco as a low-melting salts (as hereinbefore defined), the present metal ions, particularly potassium ions. "Matching or lower temperature can be carried out at temperature or hardly AUOH higher and is generally carried out for several minutes to several hours, although depending; of de: ¹ respective shape and

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Type of resin used, the amount of xonen to be removed and similar factors shorter or longer periods of application can find.

The calculation of the amount of hare required for combining with the extract can be carried out using conventional methods. If it z. For example, if you want to remove half a molar equivalent of potassium ions and 1/10 molar equivalent of calcium ions from 10 liters of aqueous tobacco extract, at least 1/2 + 1/10 or 6/10 molar equivalents of hydrogen ion would require the amount of ion exchange resin in the acid form and, for example, to use a resin with a capacity of 4 milliequivalents / g in an amount corresponding to at least 150 g (6/10 χ 1000/4 = 150). The amount of extract would thus be 10 1 with 150 g or more of resin depending on the temperature, the resin particle size, the degree of crosslinking present in the resin and other factors determining the diffusion properties of the resin for a period of perhaps 10 minutes to 2 Bring hours together.

Any working technique that results in the desired ion removal is hereby is satisfactory, and the conditions in terms of time, temperature and the like may be appropriate to those skilled in the art the best realization of each in a given Gutzuaaminenbruch chosen for the purpose to be achieved will. The ion exchange resin can be used discontinuously or continuously or semi-continuously.

Can be used for semi-continuous execution in a column you enter the pretreated resin in its appropriately sized column and the reactants continuously guide through this.

The bringing together is preferably carried out continuously Conditions. Μεη can be a column with the ion external

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Taueehharz in particle form, ζ. B. Pearl shape, fill and the Pass the aqueous extract through the column. The same working method can be used here as with chromatography columns Find.

The strong, medium or weak types can be used as cation exchange resins in the process according to the invention, e.g. B. all of the commercially available resins.

Strong resins for the: 3weoke of the invention include the sulfonic acid types, such as those made by crosslinking polystyrene obtained with divinylbenzene and sulfony: ren of the crosslinked product Resins. Such resins can be characterized by the structural formula

SO, H

-CH-OH ₂ -CH-OH ₂ -CH-Ch-

SO ₅ H-Jl

SO ₃ H

CH ₂ -CH ₂ -CH-CH ₂ -Ch-OH ₂ -CH-CH ₂ -CH

SO ₃ H
JH-CH ₂ -CH- (JH ₂

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explain,

Many cation exchange resins of this type are commercially available available including Amberlite IR 112-H +, Amberlinte IR 120-H + (manufacturer in both cases dii Rohm and Haas Company), Dowex 50 VJ-X8 (owner of the Dow Chemical Company) and the same.

To the medium strength Katior.onaustauschharzm for the purposes the invention includes the Kiosphonsäure-Typm, like the duroh Crosslinking of polystyrene m:. ·; Mvinylbenzene with conversion of the cross-linked product with Phfnphonsäure for the purpose of incorporation a bifunctional Ilen Phosp'ionaäuregruppe in the styrene-divinylbenzene lattice containing resins. Such resins can be illustrated by the following structural formula

-CH-CFjV-CH-CH ₂ -CH-CH ₂ - CH-

-CH-CH ₂ -CH-CH ₂ -CH-

PO ₃ H ₂

9 -

00911171141

The Bio-Rex 63 (manufacturer: Bio-Rad Laboratories).

Among the weak cation exchange resins for the purpose of The invention includes the carboxylic acid types, such as those made by copolymerization of methacrylic acid with a crosslinker, e.g. B. divinylbenzene, resin obtained · ?. Such resins can explain by the following structural formula:

CH, CH, CH,
3 ι 3 ι 3

1 '

-C-CH ₂ -CH-C ^ ₂ -C-

CH ₂ -

COOH COOH

Ι
COOH COOH

The explanation of a resin of this type available in the hand L. the Amberlite CG 50 type (author of Rohm and Haas Company), which serve as an artificial, weakly Baures cation Exchange resin of the carboxylic acid: type in the hydrogen form is described.

Another type of weak hot-dip resin is used by Resins formed, which as an ionfuiktionelle group an -OH group and are obtained by reacting v> n polyhydric phenols with formaldehyde. Dar explanation of Bolcher resins the following structural formula is used:

- 10 -

009 1

-OH

-CH ₂ - ft -CH ₂ - \ ^ l -CH ₂ -I-OH

CH

Solohe Hareβ can be further nodified by adding one or more additional functional groups. For example, the above phenol-formaldehyde resin can be introduced. tion of sulfonic acid groups are eul.fonated »where, like the The following structural formula shows that a resin containing both SO ^ H and OH groups is formed:

SO ₃ H

Other variants of the cation exchange resin can also be used. For example, some resins are included for the purpose of the invention, carbonaceous cation exchange resins

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Sulphonated carbon type, such as are commercially available, for example, all ^M Zeo-Carb "resins. Another type of resin for the purposes of the invention is the zeolite type of natural or artificial origin; these resins represent hydrated alkali aluminum silicates .

As cation exchange resins for the purposes of the invention can strong, weak or medium-strength resins are used, and these can belong to the above types.

Strongly basic resins such as the polystyrene-quaternary ammonium resins can be used as anion exchange resins for the purposes of the invention. Satisfactory commercial resins of this type include Amberlite IRA 400, Amberlite IRA 401, Amberlite IRA 410, Dowex I and Dowex 2, the strongly basic anion exchange resins being explained by the following formula

-CH

-CH,

) ₃ + Cl- CH ₂ K (CIL) ₃ + Cl-

CH CH ₂ -

-.CH ₂ -CH-CH ₂ -CH-

₂ N (CH ₃ ) ₃ + Cl-

Satisfactory weakly basic anion exchange resins include the primary, secondary and tertiary amines Explanation of commercial Tertiäramit.e, such as Amberlite IR 45, Dowex 3 »

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Amberlite IR 4-B, Duolite A2, Duolite A4, Duolite A6 and Duolite A7, can serve.

The typical for the Bohwach basic anion exchange resins Duolite AII4 can be represented by the following formula!

-OH CH ₉ CH OH «■

ι C ι C.

3H ₂ N (CH ₃ ) ₂ HC1

-CiH ₂ -CH-CH ₂ -OH-

Another means of adjusting the ions in tobacco is membrane electrodialysis. The aqueous tobacco extract is exposed to the action of an electrodialyzing potential in a series of cells, between which there is a water point separated by permeable and semi-porous membranes, where the tobacco extract is separated from the water on the side near the anode by a neutral membrane and on the side near the cathode by a cation-permeable membrane, the latter, since no anions can pass through it, no clogging by the large anions like those to be found in the extract Polypeptide or polyphenol anions. Since essentially no solid cations are present, there is also no analogous blocking by cations.

The corresponding anions and cations are in the water

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cells often in front of and with the exchange of dee V / ater removed against fresh water and diverted for discard. On the other hand, you can also recirculate the vaseer. Also the Extract is supplemented by constant feeding, but preferably recirculated for more thorough deionization allow. The ion range can be made to approach 90 # or by limiting the treatment time before removal interrupted by this crowd.

The treated extract can mi "water-soluble additives are combined, einsohliesslich of the means required, or to assist in the tobacco product contains desired ions. The extract is then ^r ege of manufacturing a reconstituted tobacco ProductsI to one of the known V. again with the extracted insoluble Share united.

In this way, the Tubak ion content can be directed and increased predetermined burning property new, a predetermined raich flavor and set a predetermined asohefar'je.

The preferred device for electrodialysis of the tabacco extract is a sequence or chain of 6 working solutions 1.6 mm (0.063 inch) thick, 2 chambers for isolating the electrode solutions from the tobacco extract solution and 2 electrode solution chambers. The solution kamiaera are 3/4 dm (3 inches) wide and 5 1/2 dm (22 inches) long. Ionac MC-3H2 (Ionao Chemical Company, Birmingham, Hew Jersey, USA) is particularly suitable as the cation-selective membrane and the cellulose dialysis film 4465-A2-4.9 (manufactured by AH Thomas & Company) as the neutral membrane. _;

Forming 10 solution spaces between two graphite electrodes are alternating 5 cafeion-selective membranes and 4 neutral membranes provided «To neutralize the acids and bases formed on the electrodes, mau pass through the

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the chamber adjacent to the electrode each has an electrolyte solution (an NaCl solution, the pH of which for the anode is NaOH and for the cathode is changed with HCl) and to ensure that the pH effects of the electrode currents reduce the pH value of the Do not affect the tobacco extract by attaching it to the electrode chamber adjoining insulation is always water or diluted Saline solution. Through d: rei the solvent chambers is Tap water and through the other three central chambers tobacco extract circulated. ! When voltage is applied to the electrodes, the ions in the tobacco extract are transported through the The membranes are promoted to the Leitmgswasserstrom.

The tobacco extract is continuously passed through alternating chambers in the chamber sequence, a conductivity measuring cell (for display the ion concentration of the Losing), a flow meter and to a storage tank and diroh a pump through a filter back to the chamber sequence. The circulatory system of the tobacco extract duroh lie chamber sequence takes place until the desired liberation of minerals is achieved. In a similar way Veise is the AbfallÖsxng (originally tap water) pumped through the shallow chambers in the sequence of chambers, taking up the inorganic salts removed from the tobacco extract.

example 1

A 100 g lot of powdered heel tobacco stalk was leached with cold water. 430 ml of extract were diesjs at a Festetoffgesamtgehalt of 5 # 1 1/2 hrs. With strong Auionen ⁴ "-Aüetauechharz with a Auetau λ chgesamtkapazität treated 130.0 Millliquivalenten, wjrauf the resulting solution, having a volume of 500 al in clay had a total pesticide content of 2.9 % , was combined with 140.0 mil equivalents of strong cation ’gauze resin for 1 1/2 hours. The result of the series combination with both resins as a product

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The resulting 550 ml material had a total solids content of 1.5 # ie 32 1/2 $ of the extract solids were retained by the anion and 19 $> by the cation exchange resin and 48 1/2 $> as deionized product regained "

The untreated and deionized materials were analyzed and the following compositions (based on the Dry conditions related);

Table I.

Composition, · $. based on total solids f

Phos-Ca ++ K + Mg ++ Cl "phor S0 / ~ nicotine ash

un- 2.09 13.97 0.83 3.96 0.52 2.40 0.75 31.3 acts

entio- 0.05 1.66 0.01 2.90 0.81 0.10 4.2

The series deionization resulted in a drastic reduction of all components not with the exception of chloride and phosphate. (Of the high chloride content in the present case probably means that there is no complete washing out of the cation exchange resin regeneration agent (HCl) from the resin.) The large amount of material lost to the anion exchange resin is characteristic because a substantial fraction of the organic solids of stem extract consists of monofunctional and polyfunctional Is composed of carboxylic acids,

Example 7.

KaltwasBer-Ausatig, 3 of Helltabiik stems were made according to the working method of Example 1 a: r series treatment with black basic and weakly acidic Imenausohharzen (IR-4B or. IRC-50-CP from Rokm and Haas Coapany), whereby

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13.5 # of the total dissolved solids were retained by the anion exchanger and 10 $> by the cation exchanger ζ and 76.5% were obtained as the product. The following solution analyzes show that little demolding of inorganic ions is obtained

Table II

Composition. # » Highly sensitive to extract solids

Phos-

Oa ++ K + Mg ++ phi) r Cl "S0 ~ nicotine ash

4 ·

un- 0.34 2.96 0, H 0.06 0.84 0.52 0.2 6.5 acts

treated 0.30 2.40 0.11 0.) 2 0.77 0.52 0.08 5.2 delt

Part of this solution was used in a corresponding amount of Add substance from the leached sticks and let it sit for 25 min. at 8.2 kg (18 pounds) pressure, followed by the slurry refined on a Waring misoher and made into foils of about 108 g / m 2 surface weight; was poured. The slides were shredded and made into cigarettes.

These cigarettes were smoked and shot by Elieii Prüferaue judged to the effect that Bi2 r / Lch does not differ significantly from in similarly made from untreated light tobacco stalks Differentiate between cigarettes,

Example 3

The cold water extracts from 100 j of light tobacco stalks were treated with 290 milliequivalents of strongly sajpem Kationenaustauechhara ("Dowex * 50 W-X8 of the Dow OhemiDJ.l Company) , where the νyi flowing off the resin, dissolving

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Lichen good (on dry basis) K 0.3 #, Ca 0.15 ° and total asohe 7.47 $, which shows an almost complete removal of the very abundant cationea. Part of this material was boiled with washed Helltibak Stemjelstoff, which had been obtained in the form of a corresponding amount of stem weight, for 25 minutes at 8.2 kg pressure, whereupon the slurry was refined on a YJaring misoher and poured into pollen of approximately 108 g / m area weight, which were zersc.roitzelt and made into cigarettes.

The cigarettes obtained in this way were tested by pus small Prüfer ™ aussohuss smoked, whereby mg showed that she was in the Gesohmaok of similar panels made of untreated light tobacco stalks manufactured cigarettes are different and much milder than those.

Example 4

As in Example 3, using ionized Well made with the modification cigarettes that the deionized Slurry adjusted to pH 5.5 with ammonia prior to formation of the re-substituted films became. The cigarettes obtained in this way were preferred to the (acidic) cigarettes according to the invention described in Example 3,

Example 5

Separate cold water extracts from several 100 g Antitien light tobacco stalks were treated with 290 milliequivalents of acidic cation exchange resin ( ^H Dowex ⁿ W-X8 from Dow Chemical Comply) and the treated exercises were combined again with the white tobacco stem material and 25 Min. At 8.2 kg pressure: ocht. The soles were refined on the Waring mixer and treated as follows:

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A) The acidic slurry was made as in Example 4 with ammonia brought to a pH of 5 »5. *.

B) The acidic slurry was made up using a mixture of 3 »3 parts KOH and 1.2 parts OaO brought pH value of 5t5 »

C) The acidic slurry was made using OaO brought to a pH of 5 »5.

D) The slurry was made directly from the light tobacco stem material without deionization ,? prepared.

Films were cast from the four slurries and the shredded dried foils and put into cigarettes. The cigarettes thus obtained were from a small PrÜferausBOhusB smoked with the following result:

Cigarette A (containing ammonium ions) was rated as having the bland taste and the mildest Smoke results.

The cigarette 0 (mainly with calcium) produced a fairly mild smoke, but had a somewhat unpleasant taste.

The cigarette B (calcium euzUglioh potassium) was the control cigarette highly similar and resulted in a strict smoke with a characteristic ^w Sten | el ^w -Geschmaok.

Since all cigarettes were made from the same starting material and had similar compositions with the exception of differences in the type and amounts of cations present, this experiment shows that: one can both Gesohmaok and Strength (harshness) of zigapetees by setting theirs Cation composition can vary almost at will.

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Example 6

To produce a tobacco extract, 9.07 kg of light tobacco stalks were soaked overnight in 22.66 kg of water, whereupon approximately 11.3 kg of extract were expressed from the soaked stems. 3.8 l of extract were introduced into the tobacco extract storage container of a Merabran electrodialysis apparatus while the waste material storage container was being charged with tap water. Water and extract were made by the Chambers circulated. The voltage applied to the electrodes was set to a current flow of about 8.5 A b & w. set a current density of 20 mA / om membrane * The two solutions were circulated through the chamber sequence for approximately 5 hours, with according to the conductivity estimate, about 85 # of the ions removed. Contains a comparison of the analyzes of the stem extract before and after the removal of minerals the following table.

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ι * t \

• e III 1949338 4.8 demineral distance 45 1.070 egg extract $ mg / ml 8.4 I. Partial analysis of light tobacco steneel extract 1.63 4.8 M. 9.25 1.025 42 T a b e 1 1 7.0 mg / ml 53 ' 2.32 0.98 91 after membrane-leadedialvse 0.22 4.34 53 original 1.63 0.61 55 cher extract 1.4 1.08 71 Dissolvable Solids 15.3 53.0 0.10 54 pH 2.64 0.48 28 Spea. Weight 45.2 0.64 37 0.82 38.4 77 Ha 1.3 1.66 61. K 10.2 85 01 0.32 Oa 0.2 ΗΟ, -Η Mg Total alkaloids Red. Sugar Ges. H ash P. S.

Part of the extract subjected to mineral removal was combined with washed light tobacco stem material obtained from an appropriate stalk by weight and boiled for 25 minutes at 8.2 kg Druok, whereupon the slurry was refined on a Waring mixer and poured onto sheets, which were dried over a steam bath. The foils (weight per unit area approx. 108 g / a) were released separately and processed into cigarettes *

These cigarettes were bought by a small

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smokes and judged that they differ from cigarette rats produced in a similar way from untreated holland tobacco stem material in taste and are much milder ala those are.

Unless otherwise stated, all Prosent and partial information given here relate to the weight «

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Claims (4)

I * I it β t I I 558 September 30, 1969 claims 1. Method for treating tobacco »characterized in that that he ·) By extracting τοη Tubak plant parts with vase he forms an aqueous tobacco extract and an insoluble tobacco part, b) from the tobacco extract about 20 to 95 wt. ^ of metal ions, the salts of which in dom tobacco at temperatures of about 310 to 460 ° E sohuelzen, removed and o) the product of stage (I)) again with the insoluble Taboo portion of level (ti) combined. 2. The method naoh claim 1, characterized in that there is one pulverized the tobacco to be extracted in step (a) - and the removal of ionon aua the tobacco extract in Stage (b) by treating (tea tobacco extracts with ion exchange resin. 3. The method according to claim 2, characterized in that in stage (b) the tobacco extract is treated in a series treatment with more than an ion exchange resin. 4. The method according to claim 1, characterized in that to remove ionone from the tobacco extract in step (b) the tobacco extract is exposed to the action of an electrodialysing potential in a series of cells that are formed by alternating water cells by means of permeable and permeable membranes are separated, the tobacco extralrt from the water on the side near the anode by a neutral membrane and on the side near the cathode by a cation-permeable part, which does not allow anions of a size such as that of pectins, polypeptides and polypheno'.en, is separated and where the z \. removing ions through the 0098197 ^ (9 Membrane transported through to the water cell and in be discharged from the water flow. Device for performing the method according to claim 4 »characterized by a) a series of chambers with 6 working solution chambers in the middle, in the form of alternating and parallel water or tobacco extract solution chambers, one each adjacent to the two outer working solution chambers, isolating the electrode solution from the tobacco extract solution and one adjacent to the two isolating chambers electrode solution chambers arranged and thereby isolated from the working solution chambers, b) 5 cation-selective membranes and 4 neutral membranes, which are arranged alternately and parallel to the flow of the solutions in the sequence and the sides of the 10 solution chambers and o) one in each sequence parallel to the membranes and adjacent to the electrode solution chambers and forming the outside of the latter Graphite electrode. Device according to claim 5 «characterized in that the working solution chambers have a bead of about 1.6 mm and the other Löeungskammera a bead of about 1.6 mm have and all solution chambers have a width of about 3/4 dm and a length of about 5 1/2 dm « 009819/1349