EP4364834A1 - Vorrichtung zur herstellung eines verdünnten wässrigen sodiumlaurethsulfathaltigen stroms, system, verfahren und verwendung davon - Google Patents

Vorrichtung zur herstellung eines verdünnten wässrigen sodiumlaurethsulfathaltigen stroms, system, verfahren und verwendung davon Download PDF

Info

Publication number
EP4364834A1
EP4364834A1 EP22205392.8A EP22205392A EP4364834A1 EP 4364834 A1 EP4364834 A1 EP 4364834A1 EP 22205392 A EP22205392 A EP 22205392A EP 4364834 A1 EP4364834 A1 EP 4364834A1
Authority
EP
European Patent Office
Prior art keywords
sodium laureth
laureth sulfate
stream
range
reactor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22205392.8A
Other languages
English (en)
French (fr)
Inventor
Stephanie RUPPERT
Frank Heil
Markus Huber
Tibor Z. KOVACS
Stefan Gerstung
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wella Germany GmbH
Original Assignee
Wella Germany GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wella Germany GmbH filed Critical Wella Germany GmbH
Priority to EP22205392.8A priority Critical patent/EP4364834A1/de
Publication of EP4364834A1 publication Critical patent/EP4364834A1/de
Pending legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
    • B01F25/52—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle with a rotary stirrer in the recirculation tube
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
    • B01F25/53—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle in which the mixture is discharged from and reintroduced into a receptacle through a recirculation tube, into which an additional component is introduced
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/27—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices

Definitions

  • the presently claimed invention relates to an apparatus for preparing a diluted aqueous stream comprising sodium laureth sulfate; a system comprising the apparatus, a source of an aqueous fluid and a source of a concentrated aqueous feed stream comprising sodium laureth sulfate; a method for preparing the diluted aqueous stream, the diluted aqueous stream obtained thereof, and its use for the preparation of a personal composition.
  • compositions e.g., personal care compositions are available to the consumers. Many of them are emulsions and are prepared by mixing different compounds, in order to provide compositions having satisfactory properties and benefits to the consumer. Formulation is a complex science, as it requires mixing the compounds at the right time, in the right order, under the right conditions, in order to obtain compositions having the expected structure, properties and benefits. The formulator should carefully choose the apparatus and the method, knowing that the compounds should be sequentially added under different conditions. Various methods are known. See for example the US patent 10,695,274 B2 .
  • Emulsions are particularly obtained by mixing a cosmetically acceptable carrier e.g., water and/or polyols with at least one surfactant.
  • the at least one surfactant may be selected from the group consisting of anionic surfactants, non-ionic surfactants, cationic surfactants and zwitterionic surfactants; preferably anionic surfactants.
  • Anionic surfactants such as sulfate anionic surfactants are conventionally used in personal care compositions e.g., shampoo and conditioning compositions.
  • sulfate anionic surfactants may be selected from the group consisting of sodium lauryl sulfate, sodium laureth sulfate, ammonium lauryl sulfate, ammonium laureth sulfate, triethylamine lauryl sulfate, triethylamine laureth sulfate, triethanolamine lauryl sulfate, triethanolamine laureth sulfate, monoethanolamine lauryl sulfate, monoethanolamine laureth sulfate, diethanolamine lauryl sulfate, diethanolamine laureth sulfate, lauric mono glyceride sodium sulfate, potassium lauryl sulfate, potassium laureth sulfate, ammonium cocoyl sulfate,
  • sodium laureth sulfate is particularly suitable for incorporation into personal care compositions. Indeed, sodium laureth sulfate exhibits superior performance, particularly in terms of foaming, cleaning and emulsifying properties. In addition, sodium laureth sulfate is rather inexpensive versus alternative anionic surfactants.
  • Sodium laureth sulfate may be provided in the form of a material comprising sodium laureth sulfate at a concentration in the range of ⁇ 60 to ⁇ 80 wt.%, related to the total weight of the concentrated raw material.
  • a concentrated raw material of sodium laureth sulfate is very cumbersome.
  • Sodium laureth sulfate is a compound, which exhibits a specific viscosity behaviour, and which is sometimes referred to as a "wormlike micelle-forming surfactant' or a "non-monotonic viscoelastic surfactant " .
  • the concentration of sodium laureth sulfate is of ⁇ 28 wt.-% or less or > 60 wt.-% or more, the material comprising it has a viscosity, which is low enough for being processed.
  • the concentration of sodium laureth sulfate is in the range of ⁇ 28 to ⁇ 60 wt.-%, the viscosity of the material comprising it dramatically increases up to levels, at which the material cannot be processed anymore. Consequently, it is not possible to merely use a concentrated raw material of sodium laureth sulfate by progressively diluting it in a formulation, as the formulation will reach at some point in time a concentration leading to an unprocessable viscosity.
  • a concentrated raw material of sodium laureth sulfate In order to overcome the drawbacks associated with the dilution of a concentrated raw material of sodium laureth sulfate, it is usually prediluted, for example at a concentration in the range of ⁇ 28 wt.-% or less, related to the total weight of the prediluted raw material.
  • the predilution of the concentrated raw material also has its own drawbacks. It requires carrying out an additional predilution step and temporarily storing the diluted raw material. It also requires additional equipment and monitoring. In addition, the diluted raw material may degrade or get contaminated over time, and therefore requires adding preservatives to it.
  • the inventors have shown that sodium laureth sulfate may be satisfactorily directly added to an aqueous fluid, without prior prediluting it. Indeed, the inventors have shown that such direct addition, without predilution and storage, was possible using an apparatus comprising a recircularization loop equipped with the appropriate devices, particularly a homogenizer, the arrangement of which is adapted in order to closely control the injection of the concentrated aqueous feed stream comprising sodium laureth sulfate into the aqueous fluid. This is achieved by equipping the recircularization loop and the feeding line for supplying the concentrated aqueous feed stream with separate pumps, as well as by directly injecting it into the homogenizer.
  • This direct addition using a separate pump eases the manufacturing operations, allows using a compacter apparatus, allows closely controlling the injection of the concentrated aqueous feed stream, avoids implementing additional steps, avoids using additional equipment, reduces the risks of degradation and contamination associated with the storage of a prediluted material comprising sodium laureth sulfate.
  • the presently claimed invention relates to an apparatus for preparing a diluted aqueous stream comprising sodium laureth sulfate, the apparatus comprising:
  • the first pump and the second pump are lobe pumps.
  • the homogenizer is a rotor-stator homogenizer.
  • the recircularization loop further comprises a flow metering device, and/or the first feeding line further comprises a flow metering device.
  • the presently claimed invention relates to a system for preparing a diluted aqueous stream comprising sodium laureth sulfate, the system comprising:
  • the presently claimed invention relates to a method for preparing a diluted aqueous stream comprising sodium laureth sulfate with the apparatus as described herein above and below, comprising at least the steps of:
  • steps (A) and (B) are continuously repeated.
  • the recirculated aqueous stream has a flow rate in the range of ⁇ 200 to ⁇ 500 kg/min, preferably of ⁇ 220 to ⁇ 440 kg/min, more preferably of ⁇ 240 to ⁇ 380 kg/min.
  • the concentrated aqueous feed stream has a flow rate in the range of ⁇ 20 to ⁇ 100 kg/min, preferably in the range of ⁇ 30 to ⁇ 70 kg/min, more preferably in the range of ⁇ 35 to ⁇ 65 kg/min.
  • the concentrated aqueous feed stream comprises sodium laureth sulfate at a concentration in the range of ⁇ 60 to ⁇ 80 wt.%, preferably in the range of ⁇ 65 to ⁇ 75 wt.%, more preferably in the range of ⁇ 68 to ⁇ 72 wt.%, related to the total weight of the concentrated aqueous feed stream.
  • the diluted aqueous stream comprises sodium laureth sulfate at a concentration in the range of ⁇ 0.1 to ⁇ 28 wt.%, preferably in the range of ⁇ 1 to ⁇ 24 wt.%, more preferably in the range of ⁇ 2 to ⁇ 20 wt.%, related to the total weight of the diluted aqueous feed stream.
  • the concentrated aqueous feed stream has a temperature in the range of ambient temperature, preferably in the range of ⁇ 15 to ⁇ 30 °C, more preferably in the range of ⁇ 18 to ⁇ 25 °C.
  • the recirculated aqueous stream has a temperature in the range of ⁇ 20 to ⁇ 80 °C.
  • the presently claimed invention relates to a diluted aqueous stream comprising sodium laureth sulfate, which is obtained by the method as described herein above and below.
  • the presently claimed invention relates to the use of the diluted aqueous stream comprising sodium laureth sulfate as described herein above and below, or a diluted aqueous stream comprising sodium laureth sulfate, which is obtained by the method as described herein above or below, for the preparation of a personal care composition.
  • FIGS 1 and 2 represent schematic diagrams of the apparatus as described above and below.
  • a group is defined to comprise at least a certain number of embodiments, this is meant to also encompass a group which preferably consists of these embodiments only.
  • the terms 'first', 'second', 'third' or 'a', 'b', 'c', etc. and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the presently claimed invention described herein are capable of operation in other sequences than described or illustrated herein.
  • the terms "at least one”, “one or more” or similar expressions indicating that a feature or element may be present once or more than once typically will be used only once when introducing the respective feature or element.
  • the expressions “at least one” or “one or more” will not be repeated, non-withstanding the fact that the respective feature or element may be present once or more than once.
  • hair may be "living”, i.e., on a living body, or may be "non-living", i.e., in a wig, hairpiece or other aggregation of non-living keratinous fibres.
  • Mammalian, preferably human hair is preferred.
  • wool, fur and other keratin fibres (keratin-containing fibres) are suitable substrates for the composition of the presently claimed invention.
  • composition comprising a compound in an amount of ⁇ 0.1 wt.-% or less, preferably in an amount of ⁇ 0.01 wt.-% or less, more preferably in an amount of 0 wt.-% (free of), related to the total weight of the composition.
  • a personal care composition is meant a composition, which is suitable for application to skin and hair, particularly to human skin and hair.
  • a personal care composition may be a shampoo and/or conditioning composition.
  • the presently claimed invention relates to an apparatus 1, 2 for preparing a diluted aqueous stream comprising sodium laureth sulfate, the apparatus comprising:
  • upstream and downstream are provided in reference to the fluid circularization.
  • the apparatus 1, 2 comprises a reactor 10, 20.
  • the reactor 10, 20 may comprise at least one circumferential outer wall, delimitating an inner volume.
  • the reactor may comprise one outer wall or two outer walls (so-called double-wall reactor/tank).
  • the inner volume may be filled with the fluids, which are supplied to/obtained in it, when carrying out the methods described herein.
  • the reactor 10, 20 may be substantially cylindrical in shape and have a substantially circular cross-section.
  • the reactor 10, 20 may be substantially oriented in a vertical position, such that the reactor 10, 20 comprises a substantially vertical longitudinal axis and a substantially horizontal circular cross-section.
  • the terms "top” and “bottom” are provided in reference to a substantially cylindrical reactor, which is in a vertical position.
  • the reactor 10, 20 may have a volume in the range of ⁇ 50 to ⁇ 5,000 L.
  • the reactor 10, 20 may have any suitable alternative shape and dimensions.
  • the reactor 10, 20 may be an open reactor or a closed reactor, preferably the reactor 10, 20 is a closed reactor. If the reactor is an open reactor, it may be opened at the top end. If the reactor 10, 20 is a closed reactor, it may be closed at the top end with a suitable closing device, for example a lid. If the reactor 10, 20 is a closed reactor, the inner volume may be under a controlled atmosphere (separate from the surroundings) or alternatively may not be under a controlled atmosphere, preferably the inner volume is not under a controlled atmosphere.
  • the reactor 10, 20 comprises at least one inlet point 16, 19, 26, 29, preferably from one to eight inlet points, more preferably from one to five inlet points.
  • the at least one inlet point may be located at the half top portion of the reactor 10, 20.
  • An inlet point may be located at the open top end of the reactor, it may be an opening in the wall of the reactor or, if present, it may be an opening in the closing device.
  • the aqueous fluid may be added into the reactor 10, 20 at the inlet point 16, 26.
  • the reactor 10, 20 comprises at least one outlet point 27, preferably from one to three outlet points, more preferably one or two outlet points.
  • the at least one outlet point 27 may be located at the half bottom portion of the reactor 10, 20.
  • An outlet point may be located at the bottom end of the reactor 10, 20.
  • the diluted aqueous fluid may be discharged at the outlet point.
  • the apparatus 1, 2 comprises at least one recircularization loop 11, 21, preferably from one to three recircularization loops, more preferably one recircularization loop.
  • the recircularization loop 11, 21 coveys the aqueous liquid as a recirculated aqueous stream from the reactor 10, 20 back to the reactor 10, 20.
  • the recircularization loop 11, 21 may comprise any suitable devices, which would be fluidly connected with each other, using any suitable connecting lines.
  • the recircularization loop 11, 21 comprises a first pump 12, 22.
  • the first pump 12, 22 is located upstream the homogenizer 13, 23. Consequently, the reactor 10, 20 is fluidly connected to the first pump 12, 22, the first pump 12, 22 is fluidly connected to the homogenizer 13, 23, and the homogenizer 13, 23 is fluidly connected to the reactor 10, 20.
  • the first pump 12, 22 may be a lobe pump. It is advantageous to use a lobe pump, as it avoids generating a shearing stress, which may impair the obtained emulsion.
  • the first pump 12, 22 preferably is not a roller pump, a propeller pump or a centrifugal pump. These types of pumps may generate a shearing stress, which may impair the obtained emulsion.
  • the recircularization loop 11, 21 comprises a homogenizer 13, 23.
  • the homogenizer 13, 23 may be a rotor-stator homogenizer. It is advantageous to use a homogenizer 13, 23, particularly a rotor-stator homogenizer, as it allows an efficient injection of the concentrated aqueous feed stream into the recirculated aqueous stream.
  • the recircularization loop 11, 21 may comprise a flow metering device 28. It is advantageous to use a flow metering device 28 for measuring the flow rate of the recirculated aqueous stream, thereby monitoring that the recircularization is efficiently implemented, and that the first pump 12, 22 appropriately works.
  • the apparatus 1, 2 comprises at least one first feeding line 14, 24.
  • the first feeding line 14, 24 supplies the concentrated aqueous feed stream comprising sodium laureth sulfate.
  • the at least one first feeding line 14, 24 is directly, fluidly connected to the homogenizer 13, 23.
  • the at least one first feeding line 14, 24 is not directly, fluidly connected to any connection lines and/or devices located upstream or downstream the homogenizer 13, 23. It is advantageous to directly, fluidly connect the first feeding line 14, 24 to the homogenizer 13, 23, instead of another section of the recircularization loop 11, 21, as it improves the mixing of the concentrated aqueous feed stream with the recirculated aqueous stream (and therefore the dilution of sodium laureth sulfate into the aqueous fluid). It particularly avoids the generation of localized areas within the recirculated aqueous stream, wherein the concentration of sodium laureth sulfate may exceed of > 28 wt.-%, thereby increasing the risk of clogging the apparatus.
  • the at least one first feeding line 14, 24 comprises a second pump 15, 25. It is advantageous to equip the first feeding line 14, 24 with a pump 15, 25 being separate from the pump 12, 22 equipping the recircularization loop 11, 21. Indeed, this allows controlling the injection of the concentrated aqueous feed stream, in an independent manner from the recirculated aqueous stream, thereby imparting an appropriate pressure and flow rate to the concentrated aqueous feed stream.
  • the second pump 15, 25 may be a lobe pump. It is advantageous to use a lobe pump, as it avoids generating a shearing stress, which may impair the concentrated aqueous feed stream.
  • the second pump 15, 25 preferably is not a roller pump, a propeller pump or a centrifugal pump, as these types of pumps may generate a shearing stress, which may impair the concentrated aqueous feed stream.
  • the at least one first feeding line 14, 24 may comprise a flow metering device 42. It is advantageous to use a flow metering device 42 for measuring the flow rate of the concentrated aqueous feed stream, thereby monitoring that the injection of the concentrated aqueous feed stream is efficiently implemented, and that the second pump 15, 25 appropriately works.
  • the apparatus 1, 2 may also comprise at least one additional device.
  • the apparatus may additionally comprise at least one heat exchanger 30, at least one static mixer 31, at least one by-pass line, at least one heater 32, at least one stirring tool 33, at least one additional feeding line 34, at least one inlet point and at least one outlet point.
  • the apparatus 1, 2 may comprise a heat exchanger 30.
  • the heat exchanger 30 may be a plate heat exchanger.
  • the heat exchanger 30 may be located at any suitable position of the recircularization loop.
  • the heat exchanger 30 may be located downstream the first pump 12, 22 and upstream the homogenizer 13, 23. It is advantageous to use a heat exchanger 30, as it allows closely controlling the temperature of the recirculated aqueous stream into the recircularization loop 11, 21, and avoids any unwanted cooling, which may occur during the recircularization.
  • the apparatus 1, 2 may comprise a static mixer 31.
  • the static mixer 31 may be located at any suitable position of the recircularization loop 11, 21.
  • the static mixer 31 may be located downstream the first pump 12, 22 and upstream the homogenizer 13, 23. It is advantageous to use a static mixer 31, as it avoids any phase dissociation to happen during the recircularization, which may lead to an inhomogeneous recirculated aqueous stream to be sent back to the reactor 10, 20.
  • the recircularization loop 11 only comprises a first pump 12 and a homogenizer 13
  • the fluid e.g., the recirculated aqueous stream may circulate (from upstream to downstream), via the connecting lines, from the reactor 10 through the first pump 12, and the homogenizer 13, back to the reactor 10.
  • the recircularization loop comprises a first pump, a heat exchanger and a homogenizer
  • the fluid may circulate (from upstream to downstream), via the connecting lines, from the reactor through the first pump, the heat exchanger, and the homogenizer, back to the reactor.
  • the recircularization loop 21 comprises a first pump 22, a heat exchanger 30, a static mixer 31 and a homogenizer 23
  • the fluid may circulate (from upstream to downstream), via the connecting lines, from the reactor 20 through the first pump 22, the heat exchanger 30, the static mixer 31, and the homogenizer 23, back to the reactor 20.
  • the fluid may circulate (from upstream to downstream), via the connecting lines, from the reactor through the first pump, the static mixer, the heat exchanger, and the homogenizer, back to the reactor.
  • the apparatus 1, 2 may comprise at least one by-pass line.
  • a by-pass line is a line allowing by-passing at least one device.
  • the by-pass line may be located at any suitable position of the recircularization loop 11, 21. In such case, the devices located upstream and downstream the by-passed device would be directly, fluidly connected to each other.
  • the recircularization loop 11, 21 may comprise a line by-passing the at least one heat exchanger 30.
  • the recircularization loop 11, 21 may comprise a line by-passing the at least one static mixer 31.
  • the recircularization loop 11, 21 may comprise a line both by-passing the heat exchanger 30 and the static mixer 31.
  • the recircularization loop 11, 21 may comprise a line by-passing the homogenizer 13, 23.
  • the apparatus may comprise at least one heater 32.
  • the heater 32 may be located inside the inner volume of the reactor, or it may be located within the wall thickness of the reactor, or it may be located between the walls of the reactor (in case of a double-wall reactor), or it may be located outside the wall of the reactor.
  • the heater 32 allows heating the fluid contained within the reactor 10, 20.
  • the apparatus may comprise a stirring tool 33, a drive motor 36 and optionally a shaft 35.
  • the stirring tool 33 may be located inside the reactor 10, 20.
  • the stirring tool 33 is associated with the drive motor 36 and the optional shaft 35.
  • the stirring tool 33 may be propeller stirring tool.
  • the apparatus 1, 2 may comprise at least one second feeding line 17, 34, 37, preferably from one to eight second feeding lines, more preferably from one to five second feeding lines.
  • Each second feeding line 17, 34, 37 may be connected to the corresponding inlet point 16, 26 of the reactor 10, 20 or of the recircularization loop 11, 21. It is advantageous to provide an apparatus 1, 2 comprising more than one feeding line, as it allows feeding different compounds to the aqueous fluid from different lines. Particularly, using separate feeding lines facilitates the sequential addition of different compounds, as it avoids connecting the feeding line to different sources of compounds. It also avoids the cross-contamination of the different sources of compounds. It also avoids having to clean the feeding line between the feeding of different compounds.
  • the apparatus 1, 2 may comprise at least one outlet line 18, 38.
  • the outlet line 18, 38 allows discharging the diluted aqueous stream or the personal care composition obtained with the methods according to the presently claimed invention.
  • the at least one outlet line may be directly connected to an outlet point of the reactor 27.
  • the direct connection of the outlet line allows separating the fluid flow during the mixing steps (through the recircularization loop) and the fluid flow once the mixing is achieved (through the outlet line).
  • the at least one outlet line 18, 38 may be branched on the recircularization loop 11, 21. Branching the outlet line 18, 38 on the recircularization loop 11, 21 is advantageous in that it allows deviating the fluid flow once the mixing is achieved.
  • the apparatus 1, 2 may comprise at least one storage tank.
  • a storage tank may be connected to the at least one outlet line 18, 38.
  • the storage tank may be permanently or temporarily connected to the at least one outlet line.
  • the aqueous fluid - for example the personal care composition - may be stored in at least one storage tank.
  • the aqueous fluid may be stored before being filled into a suitable packaging article, for example a bottle.
  • the apparatus 1, 2 may comprise valves 39, 40, 41 at any suitable locations.
  • the presently claimed invention relates to a system for preparing a diluted aqueous stream comprising sodium laureth sulfate, the system comprising:
  • the apparatus 1, 2 may be associated with any suitable sources of compounds.
  • Any suitable sourcing device may be used, including a tank, a syringe, a steam supply (for example for supplying water).
  • the source of the aqueous fluid is fluidly connected to the apparatus 1, 2, using any suitable connecting line.
  • the source of the aqueous fluid is fluidly connected to the reactor 10, 20, for example to one of the inlet points of the reactor 16, 26.
  • the aqueous fluid which is sourced, comprises water and optionally at least one additional compound.
  • the recirculated aqueous stream may comprise water at a concentration of ⁇ 70 wt.-%, more preferably of ⁇ 80 wt.-%, even more preferably of ⁇ 95 wt.-%, related to the total weight of the aqueous fluid.
  • the aqueous fluid, which is sourced essentially consists of water (i.e., about 100 wt.-%).
  • the aqueous fluid, which is sourced comprises water and at least one additional compound.
  • the aqueous fluid may comprise any suitable compound for incorporation into a personal care composition. Suitable compounds may be chosen from the group consisting of polyols, fatty substances, surfactants, direct dyes, lipids, conditioning agents, anti-dandruff agents, thickening and rheology-modifying agents, suspending agents, solubilizing agents, preservatives, antioxidants, UV-filters and/or sunscreens, perfume or fragrance, moisturizing and humecting agents.
  • the aqueous fluid, which is sourced, is substantially free of sodium laureth sulfate.
  • the source of the concentrated aqueous feed stream comprising sodium laureth sulfate is fluidly connected to the at least one first feeding line 14, 24.
  • the concentrated aqueous feed stream comprises sodium laureth sulfate at a concentration in the range of ⁇ 60 to ⁇ 80 wt.%, preferably in the range of ⁇ 65 to ⁇ 75 wt.%, more preferably in the range of ⁇ 68 to ⁇ 72 wt.%, related to the total weight of the concentrated aqueous feed stream.
  • the concentrated raw material Before being introduced into the recirculated aqueous stream as a concentrated aqueous feed stream, the concentrated raw material may be hold in a storage tank.
  • the concentrated aqueous feed stream comprises sodium laureth sulfate.
  • the source of the concentrated aqueous feed stream may be a concentrated raw material comprising sodium laureth sulfate, such as those being commercially available.
  • Sodium laureth sulfate is also known as sodium lauryl ether sulfate (SLES). Both expressions are interchangeably used.
  • Sodium laureth sulfate has the following chemical formula (I): CH 3 (CH 2 ) 11 (OCH 2 CH 2 ) n OSO 3 Na (I) wherein the indicia " n " corresponds to the number of ethoxyl groups and is in the range of ⁇ 2 to ⁇ 6, preferably n is 2.
  • sodium laureth sulfate is selected from the group consisting of sodium laureth-2 sulfate, sodium laureth-3 sulfate, and sodium laureth-5 sulfate. In a more preferred embodiment, sodium laureth sulfate is sodium laureth-2 sulfate.
  • Sodium laureth sulfate may be prepared by ethoxylation of dodecyl alcohol, which may be derived from palm kernel oil or coconut oil. The resulting ethoxylate may therefore be converted to a half ester of sulfuric acid, which may thus be neutralized by conversion to the sodium salt.
  • the presently claimed invention relates to a method for preparing a diluted aqueous stream comprising sodium laureth sulfate with the apparatus 1, 2 and the system as described herein above and below, comprising at least the steps of:
  • An aqueous fluid is provided in the reactor 10, 20.
  • the aqueous fluid is conveyed as a recirculated aqueous stream from the reactor 10, 20 back to the reactor 10, 20.
  • the recircularization via the reactor 10, 20 is advantageous in that the concentrated aqueous feed stream is introduced into the recirculated aqueous stream, which is then hold in the reactor 10, 20. This avoids using an additional equipment for storing the diluted aqueous feed stream such as a separate storage tank, contrary to conventional methods for prediluting concentrated raw materials comprising sodium laureth sulfate.
  • the recirculated aqueous stream comprises water and optionally at least one additional compound.
  • the recirculated aqueous stream may comprise water at a concentration of ⁇ 70 wt.-%, more preferably of ⁇ 80 wt.-%, even more preferably of ⁇ 95 % wt.-%, related to the total weight of the aqueous fluid.
  • the recirculated aqueous stream, before introducing the concentrated aqueous feed stream essentially consists of water ( i.e., about 100 wt.-%).
  • the recirculated aqueous stream, before introducing the concentrated aqueous feed stream comprises water and at least one additional compound.
  • the aqueous fluid may comprise any suitable compound for incorporation into a personal care composition, as described above.
  • the recirculated aqueous stream has a flow rate in the range of ⁇ 200 to ⁇ 500 kg/min, preferably of ⁇ 220 to ⁇ 440 kg/min, more preferably of ⁇ 240 to ⁇ 380 kg/min.
  • the recirculated aqueous stream has a pressure of less than ⁇ 5 ⁇ 10 5 Pa, preferably in the range of ⁇ 0.1 ⁇ 10 5 Pa to ⁇ 5.10 5 Pa.
  • the recirculated aqueous stream has a temperature in the range of ⁇ 20 to ⁇ 80 °C.
  • the recirculated aqueous stream may have a temperature in the range of ⁇ 20 to ⁇ 30 °C, or ⁇ 30 to ⁇ 40 °C, or ⁇ 40 to ⁇ 50 °C, or ⁇ 50 to ⁇ 60 °C, or ⁇ 70 to ⁇ 80 °C.
  • a concentrated aqueous feed stream is provided.
  • the concentrated aqueous feed stream comprises sodium laureth sulfate at a concentration in the range of ⁇ 60 to ⁇ 80 wt.%, preferably in the range of ⁇ 65 to ⁇ 75 wt.%, more preferably in the range of ⁇ 68 to ⁇ 72 wt.%, related to the total weight of the concentrated aqueous feed stream.
  • the concentrated aqueous feed stream has a flow rate in the range of ⁇ 20 to ⁇ 100 kg/min, preferably in the range of ⁇ 30 to ⁇ 70 kg/min, more preferably in the range of ⁇ 35 to ⁇ 65 kg/min.
  • This flow rate is advantageous in that it allows introducing the concentrated aqueous feed stream into the recirculated aqueous stream at a rate, which eases the solubilisation of sodium laureth sulfate.
  • step (B) the pressure of the concentrated aqueous feed stream is superior to the pressure of the recirculated aqueous stream, preferably wherein the pressure of the concentrated aqueous feed stream is at least 0.4 ⁇ 10 5 Pa higher than the pressure of the recirculated aqueous stream.
  • This difference of pressure can advantageously be obtained, by providing an apparatus 1, 2 comprising two separated pumps 12, 22 and 15, 25, as described above.
  • the concentrated aqueous feed stream has a temperature in the range of ambient temperature, preferably in the range of ⁇ 15 to ⁇ 30 °C, more preferably in the range of ⁇ 18 to ⁇ 25 °C.
  • step (B) the concentrated aqueous feed stream is introduced into the recirculated aqueous stream for a period in the range of ⁇ 1min to ⁇ 1h, preferably in the range of ⁇ 2 to ⁇ 45 min, more preferably in the range of ⁇ 3 to ⁇ 30 min.
  • the concentrated aqueous feed stream is directly introduced into the homogenizer 13, 23, preferably a roto-stator homogenizer.
  • the use of a homogenizer 13, 23, preferably a rotor-stator homogenizer, is advantageous in that there is sufficient friction for ensuring that the sodium laureth sulfate is homogeneously diluted into the recirculated aqueous stream.
  • the inventors have shown that directly introducing the concentrated aqueous feed stream into the homogenizer 13, 23, instead of another section of the recircularization loop 11, 21, improves the mixing of the concentrated aqueous feed stream with the recirculated aqueous stream, and avoids the generation of localized areas of very high viscosity.
  • the method allows obtaining a diluted aqueous stream comprising sodium laureth sulfate.
  • steps (A) and (B) are continuously repeated.
  • the concentrated aqueous feed stream is therefore continuously introduced into the recirculated aqueous stream via the homogenizer 13, 23.
  • the continuous introduction of the concentrated aqueous feed stream into the recirculated aqueous stream allows steadily increasing the concentration of sodium laureth sulfate in the recirculated aqueous stream from zero to the targeted final concentration. This is advantageous in that it allows keeping the recirculated aqueous stream under constant agitation, through the recircularization, thereby avoiding the generation of localized areas of very high viscosity.
  • the diluted aqueous stream comprises sodium laureth sulfate at a concentration in the range of ⁇ 0.1 to ⁇ 28 wt.%, preferably in the range of ⁇ 1 to ⁇ 24 wt.%, more preferably in the range of ⁇ 2 to ⁇ 20 wt.%, related to the total weight of the diluted aqueous feed stream.
  • the presently claimed invention relates to a diluted aqueous stream comprising sodium laureth sulfate, which is obtained by the method as described above.
  • the diluted aqueous stream can be directly used as a premix component for preparing a personal care composition.
  • additional compounds as described above may be added to the fluid in order to obtain a personal care composition having suitable structure, properties et benefits.
  • the presently claimed invention relates to the use of the diluted aqueous stream comprising sodium laureth sulfate as described above, or the use of a diluted aqueous stream comprising sodium laureth sulfate, which is obtained by the method as described above, for the preparation of a personal care composition.
  • the apparatus 1, 2 comprises a reactor 10, 20, which comprises one circumferential outer wall, delimitating an inner volume.
  • the reactor 10, 20 is substantially cylindrical in shape, has a substantially circular cross-section and is oriented in a vertical position.
  • the reactor 10, 20 is a closed reactor, which is closed at the top end by a lid.
  • the reactor 10, 20 comprises from one to five inlet points 16, 26, which are located at the half top portion of the reactor 10, 20.
  • One to five second feeding lines 17, 34 open to the corresponding inlet points 16, 26, for feeding the fluid with suitable compounds.
  • the reactor 10, 20 also comprises one or two outlet points 27, which are located at the half bottom portion of the reactor 10, 20.
  • a heater 32 is located inside the inner volume of the reactor 10, 20, for heating the fluid contained therein.
  • a propeller stirring tool 33 is arranged in the inner volume of the reactor 10, 20, for stirring the fluid contained therein. The stirring tool 33 is driven by a drive motor 36, through a shaft 35.
  • the apparatus 1, 2 comprises a recircularization loop 11, 21, which comprises from upstream to downstream, a first lobe pump 12, 22, a plate heat exchanger 30, a static mixer 31 and a rotor-stator homogenizer 13, 23.
  • the recircularization loop 11, 21 also comprises a flow metering device 28. Two adjacent devices are fluidly connected using a suitable connecting line.
  • the recircularization loop 11, 21 is fluidly connected to the corresponding outlet point 27 of the reactor 10, 20 and opens to the corresponding inlet point 19, 29 of the reactor 10, 20.
  • the recircularization loop 11, 21 allows generating a loop of the aqueous fluid - thereby forming a recirculated aqueous stream - from the reactor 10, 20 back to the reactor 10, 20, for improving the mixing of the aqueous fluid with various compounds, and for obtaining a formulation having a satisfactory structure and satisfactory properties.
  • the apparatus 1, 2 also comprises a first feeding line 14, 24, which comprises a second lobe pump 15, 25.
  • the first feeding line 14, 24 is directly, fluidly connected to the roto-stator homogenizer 13, 23.
  • the first feeding line 14, 24 also comprises a flow metering device 42.
  • the first feeding line 14, 24 is in fluid communication with the source of the concentrated aqueous feed stream, which comprises sodium laureth-2 sulfate (SLE2S) at a concentration in the range ⁇ 68 to ⁇ 72 wt.%, related to the total weight of the concentrated aqueous feed stream.
  • the reactor 10, 20 is in fluid communication with the source of an aqueous fluid, which essentially consists of water (i.e., about 100 wt.-%).
  • the aqueous fluid which is provided into the reactor 10, 20, is conveyed through the recircularization loop 11, 21 from the reactor 10, 20 back to the reactor 10, 20, using the first lobe pump 12, 22.
  • This allows generating a constant flux of the aqueous fluid having a flow rate in the range of ⁇ 240 to ⁇ 380 kg/min and a pressure of in the range of ⁇ 0.1 ⁇ 10 5 Pa to ⁇ 5.10 5 Pa.
  • the concentrated aqueous feed stream is directly introduced into the homogenizer 13, 23, using the second lobe pump 15, 25.
  • the concentrated aqueous feed stream is continuously introduced into the recirculated aqueous stream for a period in the range of ⁇ 3 to ⁇ 30 min, till a diluted aqueous stream comprises sodium laureth sulfate at a concentration in the range of ⁇ 2 to ⁇ 20 wt.%, related to the total weight of the diluted aqueous feed stream, is obtained.
  • the diluted aqueous stream comprising sodium laureth sulfate is then used for preparing of a personal care composition.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Cosmetics (AREA)
EP22205392.8A 2022-11-03 2022-11-03 Vorrichtung zur herstellung eines verdünnten wässrigen sodiumlaurethsulfathaltigen stroms, system, verfahren und verwendung davon Pending EP4364834A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22205392.8A EP4364834A1 (de) 2022-11-03 2022-11-03 Vorrichtung zur herstellung eines verdünnten wässrigen sodiumlaurethsulfathaltigen stroms, system, verfahren und verwendung davon

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22205392.8A EP4364834A1 (de) 2022-11-03 2022-11-03 Vorrichtung zur herstellung eines verdünnten wässrigen sodiumlaurethsulfathaltigen stroms, system, verfahren und verwendung davon

Publications (1)

Publication Number Publication Date
EP4364834A1 true EP4364834A1 (de) 2024-05-08

Family

ID=84246082

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22205392.8A Pending EP4364834A1 (de) 2022-11-03 2022-11-03 Vorrichtung zur herstellung eines verdünnten wässrigen sodiumlaurethsulfathaltigen stroms, system, verfahren und verwendung davon

Country Status (1)

Country Link
EP (1) EP4364834A1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1243356A (en) * 1968-11-04 1971-08-18 Agfa Gevaert Ag A process for the production of dispersions of sparingly soluble silver salts
US4147551A (en) * 1972-08-14 1979-04-03 E. I. Du Pont De Nemours And Company Process for photographic emulsion precipitation in a recycle stream
US20070189112A1 (en) * 2006-02-16 2007-08-16 Sandra Knape Procedure and device for homogenizing
GB2455143A (en) * 2007-11-30 2009-06-03 Ct Angewandte Nanotech Can Preparation of emulsions using inkjet technology
US20160008743A1 (en) * 2013-03-01 2016-01-14 Tetra Laval Holdings & Finance S.A. A liquid processing mixer
US10695274B2 (en) 2011-09-15 2020-06-30 The Procter And Gamble Company Method for preparing personal care composition comprising surfactant system and high melting point fatty compound

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1243356A (en) * 1968-11-04 1971-08-18 Agfa Gevaert Ag A process for the production of dispersions of sparingly soluble silver salts
US4147551A (en) * 1972-08-14 1979-04-03 E. I. Du Pont De Nemours And Company Process for photographic emulsion precipitation in a recycle stream
US20070189112A1 (en) * 2006-02-16 2007-08-16 Sandra Knape Procedure and device for homogenizing
GB2455143A (en) * 2007-11-30 2009-06-03 Ct Angewandte Nanotech Can Preparation of emulsions using inkjet technology
US10695274B2 (en) 2011-09-15 2020-06-30 The Procter And Gamble Company Method for preparing personal care composition comprising surfactant system and high melting point fatty compound
US20160008743A1 (en) * 2013-03-01 2016-01-14 Tetra Laval Holdings & Finance S.A. A liquid processing mixer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SILVERSON &: "Solutions for Your TOUGHEST MIXING Applications in THE FIRST NAME IN HIGH SHEAR MIXERS", 2 October 2022 (2022-10-02), pages 1 - 4, XP093039726, Retrieved from the Internet <URL:https://www.silverson.com/images/uploads/documents/T_High_Active_2016_US.pdf> [retrieved on 20230418] *

Similar Documents

Publication Publication Date Title
JP5551341B2 (ja) 水中油型オルガノポリシロキサンエマルジョン組成物、それからなる化粧料原料およびそれを用いた頭髪化粧料の製造方法
CN101909731B (zh) 用于制备乳液的超声处理腔室
JP5804704B2 (ja) 硫酸ウンデシルを含むパーソナルケア組成物
CN101827580B (zh) 作为聚合物阳离子化合物沉积助剂的含磷表面活性剂
CN100444823C (zh) 洗发剂组合物
US20060292100A1 (en) Aqueous phospholipid-containing carrier systems for water-insoluble materials
DE202010018435U1 (de) Zweiteiliges Haarfärbemittel
US20080095725A1 (en) Aqueous phospholipid-containing systems for water-insoluble materials
CN1327474A (zh) 含有双结构表面活性剂和助两亲物的表面活性剂组合物、其制备和用途
DE202008018292U1 (de) Zweiteiliges Haarfärbemittel
CN105456079A (zh) 清洁组合物
CN105813621A (zh) 个人洗涤组合物
US6200937B1 (en) Anti-residue shampoo and liquid toiletry production method
KR102159536B1 (ko) 샴푸 조성물
EP4364834A1 (de) Vorrichtung zur herstellung eines verdünnten wässrigen sodiumlaurethsulfathaltigen stroms, system, verfahren und verwendung davon
US11497693B2 (en) Cosmetic composition for keratin fibers and manufacturing method thereof
CN102548527A (zh) 包含聚氧化烯烷基醚的毛发处理组合物
KR101120309B1 (ko) 농축 수상을 사용한 개인 위생 제품의 제조 방법
EP4364837A1 (de) Verfahren zur herstellung einer körperpflegezusammensetzung, vorrichtung und daraus erhaltene körperpflegezusammensetzung
EP3498253B1 (de) Vesikel zur verzögerten abgabe eines duftstoffes, deren herstellung und verwendung davon
WO2011122187A1 (ja) 枠練り石鹸及びその製造方法
JP3899481B2 (ja) 染毛剤組成物
AU2018415343B2 (en) Two component hair treatment kit comprising a hair coloring cream and a developer composition comprising a specific tensioactive compound
JPWO2015119019A1 (ja) 毛髪化粧料組成物及びその使用方法
JP2017031086A (ja) 染毛剤組成物

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20231102

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR