US3703772A - Drying of detergents - Google Patents

Drying of detergents Download PDF

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US3703772A
US3703772A US166505A US3703772DA US3703772A US 3703772 A US3703772 A US 3703772A US 166505 A US166505 A US 166505A US 3703772D A US3703772D A US 3703772DA US 3703772 A US3703772 A US 3703772A
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detergent
drying
sorbent
moisture
alkyl benzene
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Neil Martin Mchugh
Clarence Scheurman
Albert Lyle Schulerud
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Colgate Palmolive Co
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Colgate Palmolive Co
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    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D11/00—Special methods for preparing compositions containing mixtures of detergents
    • C11D11/0082—Special methods for preparing compositions containing mixtures of detergents one or more of the detergent ingredients being in a liquefied state, e.g. slurry, paste or melt, and the process resulting in solid detergent particles such as granules, powders or beads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/06—Flash distillation
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/02—Anionic compounds
    • C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
    • C11D1/22—Sulfonic acids or sulfuric acid esters; Salts thereof derived from aromatic compounds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00
    • F26B7/005—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00 using admixture with sorbent materials and heat, e.g. generated by the mixture

Definitions

  • a very finely divided sorbent material such as a water soluble builder or filler salt or an insoluble scouring material
  • This'invention relates to a method for drying aqueous Solutions of synthetic organic detergents, especially those which are heat sensitive.
  • the drying is effected by first distributing the detergent solution over the sur faces of a particulate sorbent, which may also serve as a component of a detergent composition or a composition containing such detergent, and then removing the moisture from the particles by evaporation with a drying gas at a temperatureat which the detergent is stable.
  • Many detergents are produced by chemical reactions that result in solutions which must be evaporated to obtain the detergent in solid form. After such a drying operation, the detergent will often have to be size reduced, classified or compounded with other materials to convert it to a marketable product.
  • Laundry detergents are most often solid in the forms of powders and beads.
  • Cleansers such as scouring powders, are composed of very finely divided water insoluble powders, to minimize scratching of articles being scoured, and contain small quantities of water soluble detergents, which are also of small particle sizes.
  • spray drying in which water is driven off from droplets of sprayed detergent composition, in solution-dispersion or slurry form, by the heat of hot gases in a spray tower through which the droplets fall.
  • the end product often a hollow sphere or similar shape of solid detergent composition is of approximately the desired size and, after removal of fines and oversize particles, may be directly employed as a detergent powder without the necessity for size reduction.
  • a drying operation requirescrutching of the various detergent composition ingredients together'in a liquid medium and sometimes this results inadverse chemical reactions between them.
  • the high temperatures of the crutcher and the dryer can cause product degradation, especially in the spray dryer, if all the moisture has been driven off from the particles and the productis brought into contact with a hot gas or heated surface of the apparatus at a stagnant location or hot spot in it.
  • vacuum drying techniques such as flash vaporization and freeze drying. Although these do not cause thermal degradation of sensitive detergent they are comparatively expensive methods and still produce materials which must then be size reduced and blended with additional detergent composition materials. Of course, in such a blending differences in particle sizesyand densities may later result in separations or sifting of product components. If homogenous particles are to be made from a crutcher mix the amount of moisture or other solvent to be evaporated from the mix may be excessive, making the mentioned expensive drying techniques impractical.
  • Cheaper methods such as tray drying at room temperatures, roll drying or ribbon drying, may be too slow or may be inapplicable to the detergents being treated. Even if useful, they will usually require an additional size reduction and/or blending operation.
  • the various disadvantages of the previously mentioned drying methods have been overcome in the present process, which is especially useful in the drying of heat sensitive detergents.
  • the detergent solution usually containing a substantial proportion of water, is deposited on finely divided particulate sorbent materials and the detergent, including water to be evaporated,
  • the spreading action facilitates drying, since more active moistened surface is available for contact with a drying gas or for evaporation of the water into a vacuum, making it possible to employ lower drying temperatures and still obtain good drying rates.
  • a further advantage is in the joining of the organic detergent to the sorbent material useful in those cases where the sorbent is a desired constituent of the final detergent composition or other composition in which the detergent is employed.
  • the spreading or wetting action results in uniform distribution of the detergent throughout the product.
  • the wetting action of the detergent promotes the spreading and with the detergent on the outer portion of the sorbent, its surface active and wetting effects can be exerted initially, when the product is used, thereby aiding in wetting or solubilizing the other detergent constituents.
  • the important concept of the invention is to spread the detergent solution so thinly over a finely divided base or sorbent that the drying medium, e.g., hot air, is in contact with the water and it is not necessary for the heat from the drying medium to travel through any appreciable thickness of sorbent or detergent solution, nor is it necessary for the water or water vapor to be removed to diffuse through an appreciable thickness of material to escape.
  • the drying medium e.g., hot air
  • a method of drying a synthetic organic detergent comprises admixing said detergent,in solution in an aqueous medium, with a finely divided particulate solid sorptive material, suitable for incorporation in a detergent composition, to distribute the moisture in the detergent solution over the surfaces of the sorbent particles, and removing moisture from said particles at a temperature at which the detergent, which is also distributed over surfaces of the sorbent particles, will not be degraded.
  • water constitutes a major proportion of the aqueous medium
  • the detergent is a higher alkyl benzene sulfonate
  • the particulate solid sorptive material is present in quantity greater than that of the solution of detergent salt
  • the mixing and drying operations take place in short periods of time and the drying is at a comparatively low temperature.
  • FIG. 1 is a schematic view of a high shear mixer in which a solution of detergent is distributed over particles of sorbent, a flash dryer in which moisture is removed from the detergent-sorbent-moisture particles and a cyclone separator in which particles are classified, after drying;
  • FIG. 2 is a schematic view of a similar high shear mixer in which both mixing and drying are efiected, with separation of dried product from drying air being carried out in a cyclone separator, which also may serve to classify the product; and
  • FIG. 3 is a schematic view of a conventional ribbon mixer and spray means for coating sorbent therein with detergent solution, after which drying is effected in a vacuum dryer.
  • a high shear mixer 11 of the horizontal cylindrical type, the main portion of which is commercially available from Littleford-Lodige Division of Littleford Bros. Inc., Cincinnati, Ohio, and is known, in unmodified condition, as a Lodige mixer, includes a horizontal cylindrical drum 13, a pair of plows and 17, driven by main motor 19, a pair of end scrapers 21 and 23, also driven by main motor 19, and a pair of choppers 25 and 27, driven by individual chopper motors.
  • Inlet passageway 29 is for the addition of sorbent to the mixer and passage 31, communicating with distributing manifold 33 is for addition of detergent solution or suspension to the sorbent material.
  • the detergent coated sorbent containing moisture may be passed through exit line 35 to a flash evaporator 37, held under vacuum. Moisture is drawn off as a vapor through line 39 and is liquefied in a condenser, not shown. Dried particulate product 41 may then be delivered through line 43 to a cyclone separator 45, which may also act as a classifier. Any air or other gas present may be removed through line 47 with the product dropping out at 49. By utilizing different exit ports for particulate material, classification may also be effected.
  • FIG. 2 a similar type of high shear modified Lodige mixer 51 in which drum 53 contains a pair of plows 55 and 57, driven by main motor 59, a pair of scrapers 61 and 63, running off the same motor and a pair of choppers 65 and 67, running off individual chopper motors.
  • Passageway 69 is for addition of particulate solid material, such as sorbent
  • passageway 71 and distributor 73 are for addition of detergent solution to be fairly evenly distributed over the particulate sorbent, which is vigorously moved and circulated by actions of the plows and choppers at the time of addition of the liquid detergent.
  • a cloth sock vent 75 is provided to allow maintenance of the mixer at approximately atmospheric pressure or slightly above it, when materials and/or drying air are being added, while prevent losses of sorbent and detergent. It will be noted that moisture vapor can vent out through the walls of sock 75. Drying air may be added to the mixer through 77 and diffuser or distributor 79 and, together with the actions of the choppers, plows and scrapers, serves to keep the particulate material in mixer 51 in rapid motion. while drying it. During such a drying operation or after it is completed, depending on whether a continuous or batch system is employed, the dried particles may be dropped to cyclone separator 80, from which moisture vapor is removed through passage 81, with product being taken off at 83. Of course, classification can also be effected by selective removal of product from the cyclone.
  • FIG. 3 illustrates a screw or ribbon mixer 85, of the open type, in which helical blade 87, turning horizontally in trough 89 serves to keep a sorbent in motion under a spray manifold 91, through which detergent solution is deposited on the sorbent particles.
  • the sorbent-detergent-moisture particles are passed through outlet 93 to a dryer 95 operating under vacuum and at elevated temperature, although the temperature of the dryer is preferably always below that at which the detergent is unstable.
  • Vacuum line 97 also serves as a means of removal of moisture vapor from the product. Dried product may be withdrawn after sufficient lowering of the moisture content, usually producing detergent-sorbent particles containing very little water.
  • another preferred embodiment of the invention is a process carried out in accordance with FIG. 2 except for the absence of a separator, such as a cyclone or a Stokes settler.
  • a separator such as a cyclone or a Stokes settler.
  • the vent sock allows the drying air to be separated from the dried product.
  • the mixing and drying operations are separate parts of a continuous operation to produce a dried product from detergent components plus an aqueous synthetic organic detergent solution.
  • anionic detergent salts which are often made by the neutralization of corresponding detergent acids in an aqueous medium.
  • anionic detergent salts those which it is preferred to employ are the higher alkyl benzene sulfonates, which today comprise a substantial proportion of the active synthetic organic detergent constituents of heavy duty laundry products, including detergent powders and scouring powders.
  • the preferred sulfonates are those wherein the higher alkyl is of 10 to 20 carbon atoms, preferably 10 to 18 carbon atoms and most preferably from 12 to 15 carbon atoms.
  • the straight chain compounds e.g., linear dodecyl benzene sulfonate and other linear higher alkyl benzene sulfonates, wherein the salt forming ion is an alkali metal, preferably sodium, are especially good, being readily dried and being free flowing after drying.
  • linear alkyl aryl sulfonates those wherein the alkyl is terminally attached to the benzene radical or is attached at the Z-carbon.
  • these compounds can be employed in mixture with other anionic or nonionic detergents or such other detergents may be used in replacement of the alkyl benzene sulfonates.
  • the useful nonionic detergents employed are the block copolymers of ethylene oxide and propylene oxide of high.
  • the cationic detergent materials include cetyl trimethyl ammonium bromide, dioctyl dimethyl ammonium chloride, pyridinium halides, benzethonium chloride and similar quatemaryand corresponding phosphonium compounds.
  • amphoteric and ampholytic detergents any also be employed, either alone or in mixture, with others with which they are compatible. Generally, mixtures of anionic and cationic detergents should not be used.
  • the detergent be one which is normally solid, so that the sorbent-detergent particles made will be most readily free flowing.
  • liquid detergents may be employed so long as the proportions. thereof are kept within limits to produce solid and free flowing particulate products.
  • the solution of detergent material may include with it various impurities, byproducts of previous chemical reactions and solvents, in addition to water.
  • free oil or unreacted starting materials or derivatives thereof, acids, inorganic salts, e.g., sodium sulfate, and alcohols, e.g., ethanol may be present, generally to a limited extent, usually less than 20 percent and most frequently less than 10% of the detergentsolution.
  • adjuvants for the final product may be included with the detergent solution. Such adjuvants will be discussed in more detail later.
  • the sorbent or particulate substrate onto which the detergent solution is deposited may be any suitable material, over the surface of which the water in the detergent solution will spread to make it more readily vaporizable.
  • the substrate it is not necessary that the substrate be one which is water soluble or permeable and it will often be desirable for the water in the detergent solution to fail to penetrate deeply into the particles.
  • other factors are controllable to regulate penetration, including proportionsof detergent solution and substrate, concentration of detergent in the solution, viscosity of the solution, speed of mixing, particle sizes of sorbents and sprayed droplets of detergent solution, vigorousness of shearing action and speed of drying, if drying is effected in the mixer.
  • the sorbent may be a builder or a filler salt, a scouring material, adjuvant material or mixtures thereof.
  • useful adjuvants may be mentioned slip-promoting agents, e.g. talc, magnesium silicate; bulk increasing materials, e.g., alpha cellulose, asbestos; and anti-redeposition agents, e.g., polyvinyl alcohol, sodium carboxymethyl cellulose.
  • the sorbent is intended to be a builder or filler salt, such as trisodium phosphate, pentasodium tripolyphosphate, tetrasodium pyrophosphate, sodium carbonate, sodium bicarbonate, borax, boric acid (convertible to borates at alkaline pl-ls), sodium sulfate, sodium bisulfate, disodium phosphate, monosodium phosphate or other corresponding alkali metal, e.g., potassium, ammonium or other water soluble salts.
  • the insoluble type the most important is silex, a powdered silica.
  • other such materials include talc, calcium silicate, pumice, tricalcium phosphate and other known scouring and polishing agents, usually in finely divided powder form. All such materials will be referred. to herein as sorbents.
  • Adjuvants that may be employed, either as solids with the sorbent or dissolved in the detergent solution, as may be most suitable, include builder-sequestrants such as nitrilotriacetic acid and ethylene diamine tetraacetic acid; bleaches, e.g., trichloroisocyanuric acid; stain removing chemicals, e.g., enzymes; oxidizing agents, e.g., sodium perborate; reducing agents, e.g., sodium bromide; bulking materials; pH regulators; brighteners;, foaming agents; fungicides; bactericides; perfumes; colorants; viscosity enhancing compounds;
  • builder-sequestrants such as nitrilotriacetic acid and ethylene diamine tetraacetic acid
  • bleaches e.g., trichloroisocyanuric acid
  • stain removing chemicals e.g., enzymes
  • oxidizing agents e
  • adjuvants will usually comprise a minor proportion of the final dried product, generally being less than 5 percent thereof each and preferably being less than 2 percent each, with a total adjuvant content of less than 20 percent, preferably less than 10 percent.
  • lf nitrilotriacetic acid, ethylene diamine tetraacetic acid, salt thereof or other organic material is used as a principal builder the proportion may be increased to that for inorganic builder salts.
  • the above remarks with respect to NTA are with respect to the detersive or builder effects thereof, which are satisfactory. However, unless clearance is received for the use of NTA in such products, it will be omitted.
  • the trichloroisocyanuric acid being unstable in solution, will usually be employed as a powder. As with other materials which are not stable to water, it may be added subsequent to drying.
  • the detergent proportion in the final dried product will generally be from 2 to 30 percent thereof, preferably from 5 to 20 percent thereof.
  • the weight of sorbent, whether water soluble builder or filler salt or mixture, or inorganic scouring material or mixer, or other insoluble material will usually be from one or two to 40 times the weight of the detergent, e.g., alkyl benzene sulfonate, and preferably is from six to 14 times the weight thereof.
  • the proportion of such material in the final product will usually be from 50 to .95 percent thereof, preferably from 60 to percent. It
  • the final moisture content will generally be desirable to have the final moisture content comparatively low. Usually, this will be from 0.1 to 10 percent and preferably will be under 5 percent, with a preferred range being from about 0.1 to 2 percent.
  • the moisture content of the sorbent before deposition thereof the aqueous solution of detergent will normally be as low as feasible so that best spreading action will be obtained, with fastest drying resulting, too.
  • Anhydrous salts or scouring or polishing agents are much preferred but small amounts of moisture, up to 10 percent, if strongly held in hydrate form, preferably no more than percent and most preferably of 1 or 2 percent may be present.
  • the solution of detergent which may include some undissolved detergent also, will usually have from to 75 percent of detergent present, the balance being an aqueous solvent medium.
  • detergent content will be from 30 to 65 percent thereof.
  • the drying operation usually it will be best for the drying operation to have the solids content of the detergent solution as high as feasible under the circumstances.
  • the solids content of the detergent solution will most preferably be from 50 to 60 percent.
  • the balance of the solution, the aqueous medium will normally be from 80 to 100 percent of water, with some solvent or adjuvants also present, when desired, or when their presence is dictated by processing considerations.
  • the particle sizes of the sorbent will generally be small enough so that most or substantially all of the substrate will pass a No. 40 US. sieve. For ultimate scouring cleanser use, most or substantially all, over 99 percent, of the particles pass through a No. 100 sieve and a major proportion thereof will pass through a No. 200 sieve. For heavy duty detergent powder use, it is preferred that substantially all of the particles fail to pass through a No. 200 sieve and it is most preferred that a major proportion thereof should be large enough so as not to pass through a No. 60 sieve.
  • Particle size of the sorbent is a factor in determining the end use properties of the cleaning products mentioned but the diameter of the solution droplets deposited on the solid particles is of lesser importance.
  • the droplets may be broken into smaller particles before contacting the sorbent. Therefore, in many cases even streams of detergent solution may be utilized, since these are rapidly broken into small droplets and the chopping action of the mixer, if a modified Lodige mixer is employed, further serves to distribute the liquid over the substrates. Nevertheless, it is generally preferable to maintain the droplet size less than 0.050 cm. and preferably it will be from 0.005 cm. to 0.02 cm.
  • the point of addition of the detergent solution and its direction should be such as to make certain that it will impinge on the sorbent and not hit a wall surface or be swept out through a vent or other outlet before it has an opportunity to make such contact.
  • the mixer in which the sorbent is continuously moved while the detergent solution is being deposited on the particles thereof is an efficient device for moving virtually all the particles thereof all the time, without the existence of dead spaces.
  • the particle movement is irregular, whereby it is meant that a particular particle does not trace the same course repeatedly.
  • particle velocity is dependent to a large extent upon mixer design, the particles will usually be moving at speeds of about 50 to 5,000 feet per minute.
  • the mixer will normally be no more than three-fourths full of the sorbent and preferably will be from one-fourth to one-half full.
  • the pressure in the mixer will normally be about atmospheric, when the apparatus is not connected to vacuum drying means.
  • the vacuum may cause the pressure to be from 0.5 to 14 p.s.i. absolute.
  • the temperature in the mixer may be from 10C. to C. and even higher, up to the degradation point of the detergent or other material present, if desired. Whether the temperature can be maintained much above 110C., e.g., up to 250C., after removal of water will depend on the length of time to which the detergent or other sensitive material is exposed to it in the mixer and on the heat sensitivity of such material. Normally, temperatures in the mixer will rarely exceed C. and most often will be from 20C. to 70C.
  • the speed of mixing will preferably be as high as feasible and time of mixing or addition of detergent solution will preferably be as short as possible.
  • Such conditions are obtainable, with good mixing and/or drying of the detergent solution in the mixer when a high shear mixer of the Lodige type is employed, equipped with an air supply or attached to vacuum means to effect drying with mixing.
  • the excellent mixing and contacting actions obtained in such a high shear mixer are apparently due to the combination of ploughing and scraping actions, at moderate speeds, about 150 revolutions per minute, or 700 to 1,100 ft. per minute plow tip speed, combined with higher speed chopping actions, wherein the chopper blades rotate at about 3,600 r.p.m.
  • the addition and mixing operation may take as little as 5 to 10 seconds, although in other mixers this time may be increased to up to about 5 minutes.
  • drying means are employed in the high shear mixer, the drying can be effected in from 2 seconds to 2 minutes. Even less than 2 seconds can result in good drying, as when vacuum and comparatively high temperatures are both employed.
  • drying can be effected in as little as 0.01 second, essentially instantaneously. Preferably, drying takes less than 10 seconds.
  • a gas is used to aid in drying and circulating the sorbent and detergent solution in the mixer, it will usually be at a temperature in the range of 10 to 150C., preferably from 20 to 70C., and the gas will preferably be air, although other inert gases, e.g., nitrogen, carbon dioxide, halocarbons may also be used. Such gases may also be used when drying is effected in an additional drying apparatus and not in the mixer itself.
  • the rate of air flow through the mixer may be that resulting from blowing the air or other gas through a pipe of one-eighth to 2 inches inside diameter, at a pressure from 5 to 200 lbs. per sq. inch gauge.
  • the air may be diffused or may be blown into the mixer directly from the pipe.
  • the flow rate of the air which is ventable through a permeable venting sock, can be such as to result in a change of air in the mixer every 1 to 50 seconds.
  • drying is not effected in the Lodige high shear mixer but that piece of equipment is used only to distribute the detergent solution over the sorbent particles.
  • the material is flash dried, usually at an absolute pressure of from 0.5 to 14 p.s.i., with the particulate material being dried being initially at a temperature of from about to 110C. If heating is desired, the particulate sorbent may often be heated beforehand and the detergent solution, at room temperature or slightly elevated temperature, may be sprayed onto it. In such cases, means may be provided in the mixer for removing any water vapor generated upon contact of the solution and sorbent particles.
  • FIG. 2 the operation illustrated in FIG. 2 is the sameas that of FIG. 1 with the exception that the drying is effected in the mixer.
  • Such an operation is best suited for use with an inert sorbent, such as polishing material intended for incorporation in scouring cleansers.
  • the larger surface area promotes more rapid drying and the particles are not as susceptible to size reduction or fragmentation disadvantages as those intended for use in detergent powders.
  • the apparatus of FIG. 3, utilizing a conventional ribbon blender or corresponding mixer is particularly useful with sensitive materials which cannot stand either high temperature or high shear actions. I
  • the wetting action of the detergent apparently assists in distributing water over the sorbent to such an extent that gummy dried product is not obtained.
  • the mass transfer rate of water from the initial droplets applied to the substrate is greater than the heat transfer rate so that there is not formed on the substrate a blocking deposit of detergent which could prevent further distribution of moisture over the sorbent-particles. Therefore, instead of requiring more time and higher temperature for drying, less time and lower temperatures suffice.
  • the invention possesses another significant advantage in that it tends to hold the detergent tightly to the substrate material and to join other components of the final product to the substrate.
  • a more uniform detergent composition is produced and it may be of a higher bulk density than comparable spray dried products, often being from 0.5 to 1 g./ml. rather than from 0.2 to 0.4 g./ml.
  • dried detergent, without substrate were to be desired, one oouldemploy a sorbent to aid in the drying process and then could separate the sorbent from the detergent by mechanical means, including subjection to repeated shocks, followed by centrifugal action. Hydratable builder salts may be employed and will give up water of hydration during the present drying processes. Fast drying is obtainable without the need for utilizing dangerously high temperatures of drying gas.
  • detergent composition ingredients may suffice as the sorbents, carriers or bases to be employed.
  • EXAMPLE 1 Using the equipment illustrated in FIG. 1, a high shear Lodige-type mixer having a volume of approximately 12 cubic feet and equipped with plows and scrapers turning at tip speeds of about 900 ft. per. min. and, chopper blades moving at about 3,600 rpm. (5,000 ft. per. min.) there are added 76.8 parts of finely ground alpha quartz (silex), a major proportion of which passes a No. 200 sieve and substantially all of which passes through a No. US. sieve. To the quartz scouring material are added 8.2 parts of anhydrous trisodium phosphate, also finely divided so that substantially all of it passes a No. 100 sieve, with a major proportion passing through a No.
  • silex finely ground alpha quartz
  • the two sorbents (they may be adsorbents or absorbents) are blended together for approximately one-half minute, after which the dispersion is uniform. Then, about eight parts of an aqueous solution of sodium linear dodecyl benzene sulfonate detergent in which some insoluble detergent is also present is pumped into the mixer and is sprayed onto the moving sorbent mixture.
  • the alkyl aryl sulfonate is 56.5 percent solids and 87.5 percent of that is pure sodium dodecyl benzene sulfonate.
  • the solids include 1.6 percent of oil (ether solubles), 5 percent sodium sulfate, 7 percent ethanol and the balance is water.
  • the detergent-sorbentmoisture particles are discharged to a flash dryer, in which moisture is removed from them in a flashing operation at a pressure 2 p.s.i.a., the moisture being removed within seconds at room temperature, 25C., to reduce the product to a substantially anhydrous state, containing 0.2 percent moisture.
  • the particle sizes of the product resulting are slightly larger than those of the substrates charged but generally within the same particle size specifications.
  • the detergent is held tightly to the individual particles of sorbent, despite the removal of the moisture.
  • the materials are passed to a cyclone separator, where by control of the removal port locations and/or the velocity of the stream of materials, any product coarser than about 100 mesh is removed.
  • the resulting material, with adjuvants is useful as a foaming scouring cleanser. On storage, it does not cake or lump and even in the presence of various adjuvants which are unstable when in contact with synthetic organic detergent, is of satisfactory stability.
  • the above built synthetic organic detergent composition is made by adding the sodium n-tetradecyl benzene sulfonate solution to the moving mixture of the other materials, as a sorbent bed. Drying is effected with hot air being blown through the Lodige mixer during the period of addition and shortly after, for a total of 1 minute.
  • the hydratable salts initially pick up the moisture and then it is evaporated from them due to the intimate mixing of the hot air and the finely divided particles, which are within the size range of 40 to 100 mesh. Moisture content is reduced to 0.2 to 0.4 percent.
  • the product resulting which may be cyclone separated from the gas and fines which may be present, is useful as a heavy duty built synthetic detergent.
  • Variations of the formula are also made, wherein the builders are changed, using a major proportion of sodium nitrilotriacetic acid, sodium salt, instead of the pentasodium tripolyphosphate. Also, different adjuvants may be used and similar results are obtained.
  • materials are continuously added and removed and drying is satisfactorily effected with the making of an acceptable product.
  • additional drying is effected in a tray dryer at comparatively low temperature, e.g., 50C. or under vacuum, e.g., 5 p.s.i.a.
  • EXANIPLE 4 Sodium linear alkyl benzene sulfonate slurry (56.5% solids; 87.5% of the solids being SLABS) 5.l Sodium bromide 0.6 Boric acid, anhydrous 2.0 Sodium carbonate, anhydrous 4.0 Sodium sulfate, anhydrous 88.3
  • the linear alkyl group is of an average of about 13 carbon atoms and includes C C, C and C alkyls.
  • the various materials described are processed in the mixer of FIG. 1 according to the method of Example I, with the conditions of addition, particle sizes, etc., being essentially the same as in that example.
  • the formula constituents, except for the aqueous slurries are blended together and the slurries are added to them over a period or about 1 to 2 minutes, after which mixing is continued for an additional 1 to 2 minutes and the mixtures are sent to a vacuum or flash dryer, in which almost all of the moisture is removed, so that the final product has a moisture content of less than 1 percent.
  • Example 3 and 5 are suitable for use as scouring cleansers and that of Example 4 may be employed as a phosphate-free heavy duty synthetic detergent or may be added to insoluble polishing materials,e.g.,calcium silicate, calcium carbonate or alpha quartz, to produce scouring cleansers.
  • polishing materials e.g.,calcium silicate, calcium carbonate or alpha quartz.
  • the surface thickness of the water layer on the particles produced is less than 0.0 1 cm. and often is less than 0.005 cm., which contributes to the quick drying of the particles in the flash evaporator. It is notable that the moisture is on the exterior of the particles, from which it is easily removed, ratherthan on the interior surrounded by insulating material.
  • adjuvants may be incorporated in the final product after drying. Such procedures are often followed when such adjuvants, e.g., bleaches, perfumes, are sensitive to the water present in the detergent slurry.
  • a method of drying a heat-sensitive synthetic organic detergent which comprises admixing said detergent, in solution in an aqueous medium, with a particulate solid sorptive material, suitable for incorporation in a detergent composition, to distribute the moisture in the detergent solution over the surfaces of the sorbent particles, and removing moisture from said particles at a temperature at which the detergent, which is a'majo'r proportion of water and the particulate solid sorptive material is present in quantity greater than that of the solution of detergent salt.
  • the synthetic organic anionic detergent salt is an alkali metal higher alkl benzene sulfonate
  • the aqueous medium is from 0 to 100 percent water
  • the alkyl benzene sulfonate comprises from 10 to 75 percent of the totalweight of such' detergent salt and aqueous medium in which it is dissolved
  • the particulate solid sorptive material present comprises
  • alkali A metal higher alkyl benzene sulfonate is a sodium higher alkyl benzene sulfonate wherein the alkyl is a linear alkyl of 12 to 15 carbon atoms, the solution of said alkyl benzene sulfonate comprises from 30 to 65 percent of said sulfonate, and the particulate solid sorptive material present 'is from six to 14 times the weight of the alkyl benzene sulfonate.
  • sorptive material is selected from the group consisting of silica, trisodium phosphate, pentasodium tripolyphosphate, boric acid and sodium sulfate.

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Cited By (31)

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US4497757A (en) * 1983-01-31 1985-02-05 The Procter & Gamble Company Energy efficient hydration process
US5489392A (en) * 1994-09-20 1996-02-06 The Procter & Gamble Company Process for making a high density detergent composition in a single mixer/densifier with selected recycle streams for improved agglomerate properties
US5494599A (en) * 1991-04-12 1996-02-27 The Procter & Gamble Company Agglomeration of high active pastes to form surfactant granules useful in detergent compositions
US5496487A (en) * 1994-08-26 1996-03-05 The Procter & Gamble Company Agglomeration process for making a detergent composition utilizing existing spray drying towers for conditioning detergent agglomerates
US5516448A (en) * 1994-09-20 1996-05-14 The Procter & Gamble Company Process for making a high density detergent composition which includes selected recycle streams for improved agglomerate
US5516447A (en) * 1991-08-20 1996-05-14 Henkel Kommanditgesellschaft Auf Aktien Method of producing granular surfactants
US5536431A (en) * 1992-03-23 1996-07-16 Henkel Kommanditgesellschaft Auf Aktien Process for the production of free-flowing detergent granules and/or partial granules
US5554587A (en) * 1995-08-15 1996-09-10 The Procter & Gamble Company Process for making high density detergent composition using conditioned air
US5723433A (en) * 1993-09-24 1998-03-03 The Chemithon Corporation Sovent removal process
US5837106A (en) * 1993-08-20 1998-11-17 Technichem Engineering, Ltd. Halohydrocarbon recovery process
US5857269A (en) * 1994-01-31 1999-01-12 Zohar Detergent Factory Process for manufacturing fatty alcohol sulfate products
US5863887A (en) * 1997-12-01 1999-01-26 Precision Fabrics Group, Inc. Laundry compositions having antistatic and fabric softening properties, and laundry detergent sheets containing the same
US6058623A (en) * 1993-09-24 2000-05-09 The Chemithon Corporation Apparatus and process for removing volatile components from a composition
US6130193A (en) * 1998-02-06 2000-10-10 Precision Fabrics Group, Inc. Laundry detergent compositions containing silica for laundry detergent sheets
US6165961A (en) * 1996-11-20 2000-12-26 Henkel Kommanditgesellschaft Auf Aktien Water-free surface-active agents
US6730722B1 (en) * 1998-06-19 2004-05-04 Wacker-Chemie Gmbh Cross-linkable polymer powder compositions
DE10235942B4 (de) * 2002-08-06 2004-12-09 Henkel Kgaa Mittel und Vorrichtung sowie Verfahren zu seiner Herstellung für Wasch-, Reinigungs- oder Pflegemittel
EP1754779A1 (en) 2005-08-19 2007-02-21 The Procter and Gamble Company A solid laundry detergent composition comprising anionic detersive surfactant and a highly porous carrier material
US20070042926A1 (en) * 2005-08-19 2007-02-22 Roberts Nigel P S Process for preparing a solid laundry detergent composition, comprising at least two drying steps
US20070042928A1 (en) * 2005-08-19 2007-02-22 The Procter & Gamble Company Solid laundry detergent composition comprising an alkyl benzene sulphonate-based anionic detersive surfactant system and a chelant system
US20070042927A1 (en) * 2005-08-19 2007-02-22 Muller John Peter E Solid laundry detergent composition comprising alkyl benzene sulphonate and a hydratable material
US20070042932A1 (en) * 2005-08-19 2007-02-22 The Procter & Gamble Company Solid laundry detergent composition comprising alkyl benzene sulphonate, carbonate salt and carboxylate polymer
US20080045435A1 (en) * 2005-08-19 2008-02-21 Somerville Roberts Nigel Patri Solid laundry detergent composition comprising anionic detersive surfactant and calcium-augmented technology
US20080139434A1 (en) * 2006-12-08 2008-06-12 Conopco Inc, D/B/A Unilever Concentrated surfactant compositions
WO2008107463A2 (en) 2007-03-08 2008-09-12 Unilever Plc Solid detergent composition and process to prepare the same
WO2009010375A1 (en) * 2007-07-16 2009-01-22 Unilever Plc A solid detergent composition
WO2010069718A1 (en) * 2008-12-16 2010-06-24 Unilever Nv Solid builder composition
US7877895B2 (en) * 2006-06-26 2011-02-01 Tokyo Electron Limited Substrate processing apparatus
US8769841B2 (en) 2006-06-20 2014-07-08 Octapharma Ag Lyophilisation targeting defined residual moisture by limited desorption energy levels
US20150329800A1 (en) * 2012-11-16 2015-11-19 Imerys Filtration Minerals, Inc. Methods for prevention and reduction of scale formation
US20220305448A1 (en) * 2020-07-21 2022-09-29 Hefei General Machinery Research Institute Co., Ltd Integrated production system for ternary material

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US4880858A (en) * 1985-03-05 1989-11-14 Allied Colloids Limited Water absorbing polymers
DE3869631D1 (de) * 1987-01-30 1992-05-07 Allied Colloids Ltd Wasseradsorbierende polymere.
GB0009877D0 (en) † 2000-04-20 2000-06-07 Unilever Plc Granular detergent component and process for its preparation

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US725363A (en) * 1901-04-24 1903-04-14 Powter Company Process of treating oil-bearing materials.

Cited By (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4497757A (en) * 1983-01-31 1985-02-05 The Procter & Gamble Company Energy efficient hydration process
US5494599A (en) * 1991-04-12 1996-02-27 The Procter & Gamble Company Agglomeration of high active pastes to form surfactant granules useful in detergent compositions
US5516447A (en) * 1991-08-20 1996-05-14 Henkel Kommanditgesellschaft Auf Aktien Method of producing granular surfactants
US5536431A (en) * 1992-03-23 1996-07-16 Henkel Kommanditgesellschaft Auf Aktien Process for the production of free-flowing detergent granules and/or partial granules
US5837106A (en) * 1993-08-20 1998-11-17 Technichem Engineering, Ltd. Halohydrocarbon recovery process
US6058623A (en) * 1993-09-24 2000-05-09 The Chemithon Corporation Apparatus and process for removing volatile components from a composition
US5723433A (en) * 1993-09-24 1998-03-03 The Chemithon Corporation Sovent removal process
US5857269A (en) * 1994-01-31 1999-01-12 Zohar Detergent Factory Process for manufacturing fatty alcohol sulfate products
US5496487A (en) * 1994-08-26 1996-03-05 The Procter & Gamble Company Agglomeration process for making a detergent composition utilizing existing spray drying towers for conditioning detergent agglomerates
US5516448A (en) * 1994-09-20 1996-05-14 The Procter & Gamble Company Process for making a high density detergent composition which includes selected recycle streams for improved agglomerate
US5489392A (en) * 1994-09-20 1996-02-06 The Procter & Gamble Company Process for making a high density detergent composition in a single mixer/densifier with selected recycle streams for improved agglomerate properties
US5554587A (en) * 1995-08-15 1996-09-10 The Procter & Gamble Company Process for making high density detergent composition using conditioned air
US6165961A (en) * 1996-11-20 2000-12-26 Henkel Kommanditgesellschaft Auf Aktien Water-free surface-active agents
US5863887A (en) * 1997-12-01 1999-01-26 Precision Fabrics Group, Inc. Laundry compositions having antistatic and fabric softening properties, and laundry detergent sheets containing the same
US6130193A (en) * 1998-02-06 2000-10-10 Precision Fabrics Group, Inc. Laundry detergent compositions containing silica for laundry detergent sheets
US6730722B1 (en) * 1998-06-19 2004-05-04 Wacker-Chemie Gmbh Cross-linkable polymer powder compositions
DE10235942B4 (de) * 2002-08-06 2004-12-09 Henkel Kgaa Mittel und Vorrichtung sowie Verfahren zu seiner Herstellung für Wasch-, Reinigungs- oder Pflegemittel
US20070042927A1 (en) * 2005-08-19 2007-02-22 Muller John Peter E Solid laundry detergent composition comprising alkyl benzene sulphonate and a hydratable material
US7910534B2 (en) 2005-08-19 2011-03-22 The Procter & Gamble Company Solid laundry detergent composition comprising alkyl benzene sulphonate and a hydratable material
WO2007020606A1 (en) * 2005-08-19 2007-02-22 The Procter & Gamble Company A solid laundry detergent composition comprising anionic detersive surfactant and a highly porous carrier material
US20070042928A1 (en) * 2005-08-19 2007-02-22 The Procter & Gamble Company Solid laundry detergent composition comprising an alkyl benzene sulphonate-based anionic detersive surfactant system and a chelant system
US20070042931A1 (en) * 2005-08-19 2007-02-22 Roberts Nigel P S Solid laundry detergent composition comprising anionic detersive surfactant and highly porous carrier material
EP1754779A1 (en) 2005-08-19 2007-02-21 The Procter and Gamble Company A solid laundry detergent composition comprising anionic detersive surfactant and a highly porous carrier material
US20070042932A1 (en) * 2005-08-19 2007-02-22 The Procter & Gamble Company Solid laundry detergent composition comprising alkyl benzene sulphonate, carbonate salt and carboxylate polymer
US20080045435A1 (en) * 2005-08-19 2008-02-21 Somerville Roberts Nigel Patri Solid laundry detergent composition comprising anionic detersive surfactant and calcium-augmented technology
US8129323B2 (en) 2005-08-19 2012-03-06 The Procter & Gamble Company Solid laundry detergent composition comprising alkyl benzene sulphonate, carbonate salt and carboxylate polymer
CN101243173B (zh) * 2005-08-19 2011-10-05 宝洁公司 包含阴离子去污表面活性剂和高多孔性载体材料的固体衣物洗涤剂组合物
US20070042926A1 (en) * 2005-08-19 2007-02-22 Roberts Nigel P S Process for preparing a solid laundry detergent composition, comprising at least two drying steps
JP2009504835A (ja) * 2005-08-19 2009-02-05 ザ プロクター アンド ギャンブル カンパニー アニオン性洗浄界面活性剤と高多孔質担体物質とを含む固体洗濯洗剤組成物
US7910533B2 (en) 2005-08-19 2011-03-22 The Procter & Gamble Company Solid laundry detergent composition comprising anionic detersive surfactant and calcium-augmented technology
RU2396311C2 (ru) * 2005-08-19 2010-08-10 Дзе Проктер Энд Гэмбл Компани Твердая моющая композиция для стирки, содержащая анионогенное очищающее поверхностно-активное вещество и высокопористый носитель
US8769841B2 (en) 2006-06-20 2014-07-08 Octapharma Ag Lyophilisation targeting defined residual moisture by limited desorption energy levels
US8181356B2 (en) 2006-06-26 2012-05-22 Tokyo Electron Limited Substrate processing method
US7877895B2 (en) * 2006-06-26 2011-02-01 Tokyo Electron Limited Substrate processing apparatus
US20080139434A1 (en) * 2006-12-08 2008-06-12 Conopco Inc, D/B/A Unilever Concentrated surfactant compositions
WO2008107463A3 (en) * 2007-03-08 2009-08-06 Unilever Plc Solid detergent composition and process to prepare the same
EP1967512A3 (en) * 2007-03-08 2009-07-01 Unilever PLC Solid detergent composition and process to prepare the same
WO2008107463A2 (en) 2007-03-08 2008-09-12 Unilever Plc Solid detergent composition and process to prepare the same
CN101627010A (zh) * 2007-03-08 2010-01-13 荷兰联合利华有限公司 固体洗涤剂组合物及其制备方法
WO2009010375A1 (en) * 2007-07-16 2009-01-22 Unilever Plc A solid detergent composition
CN101743299B (zh) * 2007-07-16 2012-03-28 荷兰联合利华有限公司 固体洗涤剂组合物
WO2010069718A1 (en) * 2008-12-16 2010-06-24 Unilever Nv Solid builder composition
US20150329800A1 (en) * 2012-11-16 2015-11-19 Imerys Filtration Minerals, Inc. Methods for prevention and reduction of scale formation
US20220305448A1 (en) * 2020-07-21 2022-09-29 Hefei General Machinery Research Institute Co., Ltd Integrated production system for ternary material
US12053750B2 (en) * 2020-07-21 2024-08-06 Hefei General Machinery Research Institute Co., Ltd Processing system with agitated nutsche filter and conical double helix dryer

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CH568381A5 (forum.php) 1975-10-31
DE2235891A1 (de) 1973-02-08
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