EP2430344A1 - Homogeneisation haute pression avec une valve en nitrure de silicium - Google Patents
Homogeneisation haute pression avec une valve en nitrure de siliciumInfo
- Publication number
- EP2430344A1 EP2430344A1 EP10728733A EP10728733A EP2430344A1 EP 2430344 A1 EP2430344 A1 EP 2430344A1 EP 10728733 A EP10728733 A EP 10728733A EP 10728733 A EP10728733 A EP 10728733A EP 2430344 A1 EP2430344 A1 EP 2430344A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- seat
- silicon nitride
- use according
- dispersion
- 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.)
- Withdrawn
Links
- 229910052581 Si3N4 Inorganic materials 0.000 title claims abstract description 44
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 238000000265 homogenisation Methods 0.000 title claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 43
- 239000006070 nanosuspension Substances 0.000 claims abstract description 17
- 238000005516 engineering process Methods 0.000 claims abstract description 16
- 239000007787 solid Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 4
- 239000006185 dispersion Substances 0.000 claims description 16
- 230000035939 shock Effects 0.000 claims description 16
- 239000004480 active ingredient Substances 0.000 claims description 12
- 239000003381 stabilizer Substances 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 6
- 229910017493 Nd 2 O 3 Inorganic materials 0.000 claims description 5
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 5
- 239000007791 liquid phase Substances 0.000 claims description 5
- 239000004094 surface-active agent Substances 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 229910001928 zirconium oxide Inorganic materials 0.000 description 5
- 239000002105 nanoparticle Substances 0.000 description 4
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- IQQBRKLVEALROM-UHFFFAOYSA-N drinabant Chemical compound C=1C(F)=CC(F)=CC=1N(S(=O)(=O)C)C(C1)CN1C(C=1C=CC(Cl)=CC=1)C1=CC=C(Cl)C=C1 IQQBRKLVEALROM-UHFFFAOYSA-N 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 206010030924 Optic ischaemic neuropathy Diseases 0.000 description 1
- 229910005091 Si3N Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000007900 aqueous suspension Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000012377 drug delivery Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000008194 pharmaceutical composition Substances 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000005549 size reduction Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K25/00—Details relating to contact between valve members and seats
- F16K25/005—Particular materials for seats or closure elements
-
- 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
- B01F25/40—Static mixers
- B01F25/44—Mixers in which the components are pressed through slits
- B01F25/441—Mixers in which the components are pressed through slits characterised by the configuration of the surfaces forming the slits
- B01F25/4412—Mixers in which the components are pressed through slits characterised by the configuration of the surfaces forming the slits the slits being formed between opposed planar surfaces, e.g. pushed again each other by springs
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
- C04B35/584—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
- C04B35/584—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride
- C04B35/593—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride obtained by pressure sintering
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
- C04B2235/3225—Yttrium oxide or oxide-forming salts thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3232—Titanium oxides or titanates, e.g. rutile or anatase
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
Definitions
- the present application relates to the use of a homogenization valve employed in high-pressure valve technology for the preparation of a nanosuspension of a solid pharmaceutical active ingredient.
- the invention also relates to a method using said valve.
- High pressure homogenization (HPH) technology is used in galenic form to obtain nanosuspensions of particles of a solid pharmaceutical active ingredient which has a very low solubility in water.
- the particles are characterized by an average diameter d 50 ⁇ 500 nm and are stabilized by at least one stabilizer / surfactant.
- Said high pressure valve technology (or "piston-gap") that is the object of the present invention was developed by RHM ⁇ ller and is described in US 5,858,410, EP 1964605 and in the articles “Dissocubes ® - a novel formulation M ⁇ ller, p.135 of the book “Modified-release drug delivery technology", 2002, isbn 0-8247-0869-5 or J.Pharm.Pharmaco. 2004, 56, 827-840 .. This technology is also described in chap.9.2 of the book “Emulsions and nanosuspensions for the formulation of poorly soluble drugs” Medpharm, 1998, isbn 3-88763-069-6
- the problem to be solved is to have a valve-type high-pressure homogenization technology that allows nanosuspensions to be prepared without contamination by grinding residues and using robust equipment ensuring production at a high flow rate and requiring the least maintenance possible.
- the Applicant has found that this problem can be solved by using the sintered or hot-pressed silicon nitride as the material constituting the valve, the seat and possibly the shock ring or the outer surface of said elements.
- JP 1028282 discloses sintered ceramics (Si3N 4 , SiC, Si 5 AION 7 , %) having good mechanical properties and erosion resistance.
- WO 2007148237 discloses a valve for valve homogenizer.
- WO 2005/097308 discloses a valve homogenizer which one of the elements ("plunger 5") which is not a valve is silicon nitride Si 3 N 4 .
- EP 1964605 describes a valve homogenizer of which one of the elements (12c) is carbide (Wc-Co, WC-TiC-Co, WC-TiC-Ta (Nb) C-Co, etc.). [Brief description of the invention]
- the invention relates to the use of a homogenisation valve consisting of a valve, a shock ring and a seat for the preparation by high-pressure valve technology of a nanosuspension of a solid pharmaceutical active ingredient, characterized in that the material constituting (i) the seat in part, wholly or its outer surface, (ii) the valve completely or its outer surface, (iii) and optionally the shock ring totally or its outer surface comprises as a major component the silicon nitride sintered or hot pressed.
- the invention also relates to a method for preparing a nanosuspension of a solid pharmaceutical active ingredient by the high pressure homogenization technology of the valve type consisting of:
- Figure 1 diagram of a high pressure homogenization valve and the flow of the dispersion (inlet, outlet).
- Figure 2 plane of the homogenization valve made of silicon nitride according to one of the embodiments of the invention used in the examples. The dimensions indicated are given in millimeters and illustrate an embodiment of the valve according to the invention.
- nanosuspension suspension of nanoparticles
- nanoparticles particles of a solid compound whose average diameter d50 (determined by laser diffraction) is ⁇ 1000 nm;
- the so-called high-pressure valve technology it makes it possible to prepare a nanosuspension from a dispersion of a solid pharmaceutical active ingredient in a liquid phase whose initial average diameter d50 is higher than the average diameter d50 of the nanosuspension.
- the liquid phase is usually pure water; however, pharmaceutically acceptable solvents such as ethanol may also be added.
- the initial average diameter d50 is preferably ⁇ 25 ⁇ m to avoid blocking the gap between the seat and the valve.
- the stability of the nanosuspension is ensured by means of at least one stabilizing / surfactant agent which will be chosen according to the active pharmaceutical ingredient and the particle size of the nanosuspension.
- High-pressure valve technology consists in imposing a high pressure (on the order of 100 to 2000 bars) on the dispersion by means of a piston pump (s), and then relaxing the dispersion through a valve. homogenization (described below).
- the principle of size reduction is based firstly on the energy density generated by the interparticle shocks and by the collision of the particles with the valve and with the shock ring and on the other hand on the energy generated.
- cavitation and turbulence Cavitation is caused by rapid expansion of the liquid which causes the formation of microbubbles of vapor.
- Devices using this technology are marketed for example by APV Gaulin GmbH.
- the homogenizing valve consists of 3 elements: a valve (Y), a seat (2) and a shock ring (3) (see Fig.1). It has been found that (i) the seat (2) consists, in part, wholly or its outer surface, of the silicon nitride material described hereinafter and (ii) the valve (1) made of, wholly or outer surface, said material can solve the technical problems described above. This material based on silicon nitride is sufficiently resistant to allow the preparation of nanosuspension for a long time and without having to disassemble the homogenization valve to change one of the elements.
- the impact ring (3) or its outer surface may also be made of a similar material.
- the valve (1) and / or of the seat (2), and / or possibly of the shock ring (3) is constituted of said material to silicon nitride base, the core of said elements being made of another material does not have the same mechanical characteristics of impact resistance and abrasion.
- the core of said elements being made of another material does not have the same mechanical characteristics of impact resistance and abrasion.
- the outer surface of the valve is made of said silicon nitride material, and the seat is made completely of said silicon nitride material.
- the ring or its outer surface may consist of said material based on silicon nitride or another material (as illustrated in the Examples: Carbide tungsten, etc.).
- the seat it can be effectively made entirely of the silicon nitride material described hereinafter. It is also possible that only one of the parts of the seat is made of said material.
- the internal part (6c, 6d) of the seat consists of said material based on silicon nitride
- the outer part (6a, 6b) of the seat consists of another material that does not have the same characteristics. mechanical resistance to impact and abrasion.
- This other material may in particular be based on stainless steel or stainless steel (steels composed of iron alloy, chromium, nickel, and other minerals providing some resistance to corrosion).
- the surface of the valve is made of silicon nitride material or preferably the valve is made entirely of silicon nitride material.
- the ring may consist of said material based on silicon nitride or another material (as illustrated in the Examples: tungsten carbide, etc.).
- a dispersion in the liquid phase of the solid pharmaceutical active ingredient whose initial average d50 diameter is preferably ⁇ 25 microns.
- To this dispersion is added at least one stabilizing / surfactant agent.
- the dispersion is then pumped to the high pressure homogenizer and compressed at a pressure ranging from 100 to 2000 bar and then expanded through the homogenization valve described above.
- the compression is ensured by a piston pump (s).
- a recirculation loop makes it possible to recirculate, if necessary, several times the dispersion through the homogenization valve.
- the silicon nitride-based material comprises, as the major component, sintered silicon nitride (or SSN for sintered silicon nitride) or hot-pressed nitride (or HPSN for high-pressure silicon nitride).
- the material comprises more than 75% (by weight), advantageously more than 80%, preferably more than 85% of sintered or hot-pressed silicon nitride. It may comprise other components whose function is to reinforce the mechanical characteristics of the silicon nitride or to be sintering agents, for example Al 2 O 3, Y 2 O 3, TiO 2 , Nd 2 O 3 .
- the material preferably comprises, by weight, 80 to 90% of sintered or hot-pressed silicon nitride and 0 to 20% of component (s) chosen from Al 2 O 3 , Y 2 O 3 , TiO 2 or Nd 2 O 3 .
- component (s) chosen from Al 2 O 3 , Y 2 O 3 , TiO 2 or Nd 2 O 3 .
- An example of usable silicon nitride material is Kersit ® 301 which is a hot-pressed silicon nitride developed by CTDesmarquest company (Saint Gobain), and whose composition by weight and the characteristics are as follows: Si 3 N 4 : 88.5%, Al 2 O 3 , Y 2 O 3 , Nd 2 O 3 , TiO 2 1 1, 5%; density>3.25; bending strength> 800 MPa; hardness
- Niro-Soavi NS2006 homogenizers 35 l / h, 1500 bar
- NS3024 300 l / h, 1500 bar
- Each valve consists of a seat (2), a valve (or shock bar) (1) and a shock ring (3) (see Figure 1).
- the dimensions as well as the relative configuration of each of the valves are described in Table I.
- valve (4) is made of silicon nitride.
- the seat (6) is tungsten carbide (5a, 5b).
- the seat (6) is made of stainless steel (6a, 6b) and silicon nitride (6c, 6d).
- LAVE1625 is N- [1- [bis (4-chlorophenyl) methyl] azetidin-3-yl] -N- (3,5-difluorophenyl) methanesulfonamide having for N 0 CAS 358970-97-5. Board
- the silicon nitride valve was selected and used in various tests on NS2006 without the mechanical properties being altered as shown in the results of Table III.
- a silicon nitride valve more particularly made of KERSIT ® 301 material or equivalent, can therefore advantageously be used in the HPH technology of the "piston-gap" type for the preparation of pharmaceutical formulations comprising an active principle in the form of dispersed nanoparticles. in water and stabilized with at least one stabilizing agent, the nanoparticles being of average diameter less than 1000 nm and more generally between 1000 nm and 20 nm.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- General Engineering & Computer Science (AREA)
- Dispersion Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Ceramic Products (AREA)
- Lift Valve (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0902290A FR2945458B1 (fr) | 2009-05-13 | 2009-05-13 | Homogeneisation haute pression avec une valve en nitrure de silicium |
| PCT/FR2010/050902 WO2010130938A1 (fr) | 2009-05-13 | 2010-05-10 | Homogeneisation haute pression avec une valve en nitrure de silicium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2430344A1 true EP2430344A1 (fr) | 2012-03-21 |
Family
ID=41449928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP10728733A Withdrawn EP2430344A1 (fr) | 2009-05-13 | 2010-05-10 | Homogeneisation haute pression avec une valve en nitrure de silicium |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20120127823A1 (fr) |
| EP (1) | EP2430344A1 (fr) |
| FR (1) | FR2945458B1 (fr) |
| WO (1) | WO2010130938A1 (fr) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9194352B2 (en) | 2012-10-25 | 2015-11-24 | Caterpillar Inc. | Pressure relief valve for common rail fuel system |
| JP5667666B2 (ja) * | 2013-06-28 | 2015-02-12 | 三井製糖株式会社 | 糖結晶含有液を製造する方法 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5623507A (en) * | 1979-08-02 | 1981-03-05 | Toshiba Corp | Exhaust valve |
| JPS6428282A (en) * | 1987-07-24 | 1989-01-30 | Hitachi Ltd | High-strength sintered composite ceramic material having excellent toughness and corrosion resistance and production thereof |
| DE4440337A1 (de) * | 1994-11-11 | 1996-05-15 | Dds Drug Delivery Services Ges | Pharmazeutische Nanosuspensionen zur Arzneistoffapplikation als Systeme mit erhöhter Sättigungslöslichkeit und Lösungsgeschwindigkeit |
| ITPR20040031A1 (it) | 2004-04-09 | 2004-07-09 | Niro Soavi Spa | Omogeneizzatore per il trattamento in continuo di fluidi ad altissima pressione. |
| ITPR20060056A1 (it) | 2006-06-23 | 2007-12-24 | Niro Soavi Spa | Omogeneizzatore ad alta pressione provvisto di testata per il trattamento di prodotti con solidi e fibre |
| EP1964605B1 (fr) * | 2007-02-28 | 2009-12-09 | Shigeo Ando | Soupape d'injection d'homogénéisateur haute pression |
| US7908934B2 (en) * | 2008-02-29 | 2011-03-22 | Dionex Corporation | Valve assembly |
-
2009
- 2009-05-13 FR FR0902290A patent/FR2945458B1/fr not_active Expired - Fee Related
-
2010
- 2010-05-10 WO PCT/FR2010/050902 patent/WO2010130938A1/fr not_active Ceased
- 2010-05-10 EP EP10728733A patent/EP2430344A1/fr not_active Withdrawn
- 2010-05-10 US US13/320,191 patent/US20120127823A1/en not_active Abandoned
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2010130938A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2945458A1 (fr) | 2010-11-19 |
| WO2010130938A1 (fr) | 2010-11-18 |
| US20120127823A1 (en) | 2012-05-24 |
| FR2945458B1 (fr) | 2011-06-17 |
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