Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D11/00—Solvent extraction
  • B01D11/04—Solvent extraction of solutions which are liquid
  • B01D11/0446—Juxtaposition of mixers-settlers
  • B01D11/0449—Juxtaposition of mixers-settlers with stationary contacting elements
• • 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
  • B01D3/14—Fractional distillation or use of a fractionation or rectification column
  • B01D3/16—Fractionating columns in which vapour bubbles through liquid
  • B01D3/22—Fractionating columns in which vapour bubbles through liquid with horizontal sieve plates or grids; Construction of sieve plates or grids
  • B01D3/225—Dual-flow sieve trays
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D11/00—Solvent extraction
  • B01D11/04—Solvent extraction of solutions which are liquid
  • B01D11/0426—Counter-current multistage extraction towers in a vertical or sloping position
  • B01D11/043—Counter-current multistage extraction towers in a vertical or sloping position with stationary contacting elements, sieve plates or loose contacting elements
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D11/00—Solvent extraction
  • B01D11/04—Solvent extraction of solutions which are liquid
  • B01D11/0426—Counter-current multistage extraction towers in a vertical or sloping position
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D11/00—Solvent extraction
  • B01D11/04—Solvent extraction of solutions which are liquid
  • B01D11/0446—Juxtaposition of mixers-settlers
  • B01D11/0461—Juxtaposition of mixers-settlers mixing by counter-current streams provoked by centrifugal force
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D11/00—Solvent extraction
  • B01D11/04—Solvent extraction of solutions which are liquid
  • B01D11/0492—Applications, solvents used
• • 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
  • B01D3/14—Fractional distillation or use of a fractionation or rectification column
  • B01D3/16—Fractionating columns in which vapour bubbles through liquid
  • B01D3/22—Fractionating columns in which vapour bubbles through liquid with horizontal sieve plates or grids; Construction of sieve plates or grids
• • 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
  • B01D3/14—Fractional distillation or use of a fractionation or rectification column
  • B01D3/32—Other features of fractionating columns ; Constructional details of fractionating columns not provided for in groups B01D3/16 - B01D3/30
• • 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
  • B01D3/14—Fractional distillation or use of a fractionation or rectification column
  • B01D3/32—Other features of fractionating columns ; Constructional details of fractionating columns not provided for in groups B01D3/16 - B01D3/30
  • B01D3/324—Tray constructions
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
  • B01J19/32—Packing elements in the form of grids or built-up elements for forming a unit or module inside the apparatus for mass or heat transfer
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D11/00—Solvent extraction
  • B01D2011/002—Counter-current extraction
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
  • B01J2219/32—Details relating to packing elements in the form of grids or built-up elements for forming a unit of module inside the apparatus for mass or heat transfer
  • B01J2219/322—Basic shape of the elements
  • B01J2219/32203—Sheets
  • B01J2219/32213—Plurality of essentially parallel sheets
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
  • B01J2219/32—Details relating to packing elements in the form of grids or built-up elements for forming a unit of module inside the apparatus for mass or heat transfer
  • B01J2219/322—Basic shape of the elements
  • B01J2219/32203—Sheets
  • B01J2219/32255—Other details of the sheets
  • B01J2219/32262—Dimensions or size aspects
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
  • B01J2219/32—Details relating to packing elements in the form of grids or built-up elements for forming a unit of module inside the apparatus for mass or heat transfer
  • B01J2219/332—Details relating to the flow of the phases
  • B01J2219/3325—Counter-current flow

Definitions

• the field of the invention relates to a column (extractor) for the liquid-liquid separation of hydrocarbon compounds, such as aromatic compounds (e.g. A6-A11) from extended hydrocarbon cuts (e.g. C6-C11 cut, such as from a catalytic cracking unit (FCC Fluid Catalytic Cracking according to the English terminology).
• hydrocarbon compounds such as aromatic compounds (e.g. A6-A11)
• extended hydrocarbon cuts e.g. C6-C11 cut, such as from a catalytic cracking unit (FCC Fluid Catalytic Cracking according to the English terminology).
• a liquid-liquid extraction operation is a key brick of processes carrying out the separation of hydrocarbon cuts, such as the separation of a mixture of aromatics and non-aromatics.
• the principle of operation is based on the differences in solubility of the compounds of a homogeneous liquid filler in an appropriate solvent (e.g. aprotic and polar solvent, such as Sulfolane or DMSO).
• an appropriate solvent e.g. aprotic and polar solvent, such as Sulfolane or DMSO.
• a partially miscible solvent causes the appearance of a second phase towards which some of the compounds (e.g. aromatic compounds), the most soluble constituents, are preferentially transferred.
• the liquid-liquid extraction technology implements a liquid-liquid separation column comprising a plurality of perforated plates and equipped with one to several weirs per plate depending on the targeted capacities (we speak of a plate with 1 or 2 passes or multi-passes beyond 3 weirs).
• the object of the present invention is to remedy the deficiencies mentioned above.
• a first object of the present description is to propose a liquid-liquid extraction column allowing:
• a liquid-liquid extraction column comprising the following elements:
• n zones a first point for withdrawing an extract and a second point for withdrawing a raffinate, one (of the first and second points of withdrawal) being placed at the bottom of the column and the other being placed at the head of the column ; - a plurality of plates arranged in the column (for example from the top of the column to the bottom of the column or from the bottom of the column to the top of the column) and defining n zones, each zone comprising at least two plates, n being included between 2 and 30, preferably between 3 and 30; in which the n zones include:
• the height H of the inter-plate spaces of the at least one backwash zone is less than the height H of the inter-plate spaces of the Zi zone.
• n is between 3 and 30, and x is greater than 1.
• the liquid-liquid extraction column comprises the following elements:
• n zones include: - a plurality of extraction zones Zj comprised between a column head zone Zi comprising the second point of injection of the second phase (and the second point of withdrawal of the raffinate), and a feed zone Z x comprising the first injection point of the first phase, x being greater than 1;
• the liquid-liquid extraction column comprises the following elements:
• n zones a plurality of plates arranged in the column, for example from the top of the column to the bottom of the column or from the bottom of the column to the top of the column, and defining n zones, each zone comprising at least two plates, n being included between 3 and 30; in which the n zones include:
• the trays of the same zone have substantially the same height H of inter-tray space; and in which the height H of the inter-plate spaces of the zones Zj increases when the value i increases.
• the ratio between the height H of an inter-plate space of a zone Zj on the height H of an inter-plate space of a zone Zj+i is between 0.20 and 0.95.
• the ratio between the height H of an inter-plate space of a zone Zj on the height H of an inter-plate space of a zone Z i+i is between 0.40 and 0.90.
• the ratio between the height H of an inter-plate space of a zone Zj on the height H of an inter-plate space of a zone Zj+i is between 0.75 and 0.85.
• the ratio between the height H of an inter-tray space of the at least one backwash zone over the height H of the inter-tray space of the Zi zone is between 0.20 and 0.95.
• the at least one backwash zone is a plurality of zones, from a zone Z x +i to the zone (eg column bottom) Z n , and in which the height H of the inter-plate spaces increases, is constant, or decreases from zone Z x +i to zone Z n .
• the at least one backwash zone is a plurality of zones subdivided into:
• the height H of the inter-plate spaces increases, is constant, or decreases when the value j increases;
• the height H of the inter-plate spaces increases, is constant, or decreases when the value k increases.
• the ratio between the height H of the inter-plate spaces of a zone Zj over the height H of the inter-plate spaces of a zone Zj+i is between 0.20 and 0.95.
• the ratio between the height H of the inter-plate spaces of a zone Zj over the height H of the inter-plate spaces of a zone Zj+i is between 1.10 and 2.0.
• the ratio between the height H of the inter-plate spaces of a zone Z k over the height H of the inter-plate spaces d 'a zone Z k +i is between 0.20 and 0.95.
• the ratio between the height H of the inter-plate spaces of a zone Z k over the height H of the inter-plate spaces d 'a zone Z k +i is between 1.10 and 2.0.
• the number of zones Zj is between 2 and 10 and/or the number of backwash zones is between 1 and 10.
• the number of zones Zj is between 2 and 10 and/or the number of zones Z k is between 2 and 10.
• the height H of the inter-plate spaces of the backwash zone Z x +i is less than, equal to or greater than the height H of the inter-plate spaces of the extraction zone Z x .
• the height H of the inter-plate spaces of the backwash zone Z x+i is lower than the height H of the inter-plate spaces of the extraction zone Z x .
• the height H of each inter-plate space is between 0.2 m and 1.2 m.
• Figure 1 schematically shows a sectional view of a liquid-liquid extraction column according to the present invention.
• Figure 2 schematically shows a cross-sectional view of the flow of the dispersed phase and the continuous phase in a liquid-liquid extraction column according to the present invention.
• FIG. 3 schematically shows a sectional view of a liquid-liquid extraction column according to the present invention defined by a plurality of zones Zj comprised between the column head zone 1 and the feed zone Z x , a plurality of Zone Zj lying between zone Z x +i and a zone Z y , and a plurality of zones Z k lying between zone Z y +i and zone Z n at the bottom of the column.
• FIG. 4 is a graph showing the evolution of the inter-plate transverse velocity of the continuous phase along a liquid-liquid extraction column according to the present invention, in which the height H of the inter-plate spaces is variable .
• Figure 5 and Figure 6 are graphs showing the evolution of the inter-plate transverse velocity of the continuous phase along reference liquid-liquid extraction columns in which the height H of the inter-plate spaces is constant.
• the term “understand” is synonymous with (means the same as) "include” and “contain”, and is inclusive or open-ended and does not exclude other non-recited material. It is understood that the term “include” includes the exclusive and closed term “consist”. Furthermore, in the present description, the term “substantially” corresponds to an approximation of ⁇ 10%, preferably ⁇ 5%, very preferably ⁇ 2%, of a reference value such as a distance, a speed, flow rate, compound content, temperature, pressure, etc.
• a liquid-liquid extraction column 1 comprises the following elements: - a first point of injection of a first phase 2 (or liquid to be separated), such as a filler (eg a mixture of aromatic and non-aromatic C6-C11 compounds), arranged at an intermediate position between the top and the bottom of column 1;
• a filler eg a mixture of aromatic and non-aromatic C6-C11 compounds
• a second injection point for a second phase 3 such as a solvent (e.g. sulfolane), placed at the head of column 1;
• a solvent e.g. sulfolane
• a backwash liquid 4 such as a recycle (e.g. a mixture comprising at least 50% by weight of light compounds, (i.e., C5-C8 compounds, preferably C5-C6) , arranged at the bottom of column 1;
• a recycle e.g. a mixture comprising at least 50% by weight of light compounds, (i.e., C5-C8 compounds, preferably C5-C6) , arranged at the bottom of column 1;
• an extraction sector 7 extending substantially from the first injection point of the first phase 2 to substantially the second injection point of the second phase 3, makes it possible in particular to extract compounds (e.g. aromatics) of the liquid to be separated 2 by contact with the separation liquid 3 in countercurrent (so-called yield zone), and
• a backwash sector 8 (or backwash according to English terminology), adjacent to the extraction sector 7 and extending up to substantially the third point of injection of the backwash liquid 4, makes it possible in particular to counter-extracting unwanted compounds (e.g. heavy non-aromatics) contained in the extract 5 by the counter-washing liquid 4 in order to guarantee a high level of purity.
• unwanted compounds e.g. heavy non-aromatics
• the separation liquid leaves column 1, causing compounds of interest to be separated (eg aromatics) to form the extract 5.
• the extract may also contain undesired compounds (eg light non-aromatics, such as C6-C7) which can be separated downstream (eg by distillation and/or stripping).
• extract 5 does not contain (or very little) undesired compounds which are difficult to separate (eg heavier non-aromatics, such as C8+), which are separated from the extract in the backwash sector.
• the separation liquid 3 is heavier than the liquid to be separated 2 and is injected at the top of column 1 while the backwash liquid 4 is injected at the bottom of column 1.
• the present invention also relates to liquid-liquid extraction columns, in which the separation liquid is lighter than the liquid to be separated 2, the point of injection of the separation liquid 3 is at the bottom of column 1 and the backwash liquid injection point 4 is at the top of column 1.
• a two-pass liquid-liquid extraction column 1 comprises n perforated plates Pj, i being between 1 and n.
• Each perforated plate Pj is arranged so that the dispersed phase (i.e., the separation liquid 3 heavier than the liquid to be separated
• the liquid to be separated 2 circulates counter-current to the separation liquid 3, ie, from bottom to top through the central weirs 11 and peripheral weirs 12 of cross section Sc and SP, respectively, and transversely in an interspace. plates 10 of height H.
• the heavy phase is the dispersed phase and the light phase is the continuous phase.
• a liquid-liquid extraction column 1 can comprise perforated plates adapted so that the dispersed phase is the light phase and the continuous phase is the heavy phase.
• the perforated plates Pj are 1-pass (e.g. one type of weir) or 2-pass (e.g. two types of weir) or multi-pass plates.
• a liquid-liquid extraction column 1 is further defined by:
• the extraction zone or zones Zj are included between the column head zone Zi comprising the second injection point of the second phase 3, and the supply zone Z x comprising the first injection point of the first phase 2, x being greater than or equal to 1, preferably x being greater than 1;
• the backwash zone(s) is or are comprised between the zone Z x +i and the bottom zone of column Z n comprising the third point of injection of backwash liquid 4, n being greater than x.
• each extraction and backwash zone comprises at least two plates, each extraction and backwash zone defining the structural characteristics of the inter-plate spaces present in said extraction and backwash zones. - washing.
• the trays Pj of the same extraction or backwashing zone have substantially the same height H of inter-tray space 10.
• the at least one backwash zone is a plurality of zones, said plurality of zones starting from the zone Z x +i to the column bottom zone Zn.
• the at least one backwash zone is a plurality of zones subdivided into:
• zones Zk comprised between the zone Z y+i and the column bottom zone Z n .
• the number of zones Zj, Zj and Zk can be defined with regard to the flow rate variability and the physico-chemical properties of the phase passing through said zones Zj, Zj and Zk.
• the total number n of zones is between 2 and 30, preferably between 3 and 30, very preferably between 4 and 24, such as between 4 and 18, in particular between 4 and 8.
• i, j, k, x, y and n are natural integers.
• the number of extraction zones Zj can be defined with respect to the phase which exhibits the most flow rate variability in the column. According to one or more embodiments, the number of zones Zj (number of zones Zi to Z x ) is between 1 and 10, preferably between 2 and 10, very preferably between 2 and 6, such as between 2 and 4.
• the number of backwash zones can be set with respect to the phase that presents the most flow variability in the column.
• the number of backwash zones (number of zones Z x+i to Z n ) is between 1 and 10, preferably between 1 and 6, very preferably between 1 and 4. or more modes of realization, the number of backwash zones (number of zones Z x +i to Z n ) is greater than or equal to 2.
• the number of zones Zj can be defined with respect to the phase which presents the most flow variability in the column. According to one or more embodiments, the number of zones Zj (number of zones Z x +i to Z y ) is between 2 and 10, preferably between 2 and 6, very preferably between 2 and 4.
• the number of zones Z k can be defined with respect to the phase which exhibits the most flow rate variability in the column. According to one or more embodiments, the number of zones Z k (number of zones Z y+i to Z n ) is between 2 and 10, preferably between 2 and 6, very preferably between 2 and 4.
• the number of plates per zone Zj, Zj and Z k can be determined by the number of actual stages required for the separation divided by the number of zones Zj, Zj and Z k .
• the liquid-liquid extraction column 1 comprises inter-plate spaces 10 with variable height H so that the transverse velocity (orthogonal to the central axis Z of the column) of the continuous phase remains substantially constant in the column.
• the variation of the height H of the inter-plate spaces 10 allows a more homogeneous distribution of the continuous phase in the inter-plate space 10 , in particular avoiding recirculations and dead volumes, while limiting the deformation of the flow of the dispersed phase.
• This solution also makes it possible to reduce the axial mixing of the continuous phase and the dispersed phase.
• the liquid-liquid extraction column 1 is divided into:
• the backwash zones are divided into: - Y zones Zj arranged from zone Z x+i adjacent to supply zone Z x , up to a zone Z y , for example where the height ratio between two consecutive zones H/Hj+i remains less than 1, and
• zones Zk including zones Z y+i to Z n .
• the height H of the inter-plate spaces 10 of the at least one backwash zone is less than the height H of the inter-plate spaces 10 of the Zi area.
• the ratio between the height H of an inter-plate space 10 of the at least one backwash zone (eg zone Z 2 ) over the height H of the inter-plate space 10 of the zone Zi is between 0.20 and 0.95, preferably between 0.40 and 0.90, very preferably between 0.75 and 0.85.
• the height H of the inter-plate spaces 10 increases when the value i increase.
• the ratio between the height H of an inter-plateau space 10 of a zone Zj over the height H of an inter-plateau space 10 of a zone Zj+i is between 0.20 and 0.95, preferably between 0.40 and 0.90, very preferably between 0.75 and 0.85.
• the at least one backwash zone comprises a plurality of zones, ie, from the zone Z x +i to the column bottom zone Z n , and the height H of a inter-plate space 10 increases from zone Z x +i to column bottom zone Z n .
• the at least one backwash zone comprises a plurality of zones, ie, from the zone Z x+i to the column bottom zone Z n , and the height H of a inter-plate space 10 is constant from zone Z x+i to column bottom zone Z n .
• the at least one backwash zone comprises a plurality of zones, ie, from the zone Z x+i to the column bottom zone Z n , and the height H of a inter-plate space 10 decreases from zone Z x+i to column bottom zone Z n .
• the height H of the inter-plate spaces 10 increases when the value j increases.
• the ratio between the height H of an inter-plate space 10 of a zone Zj over the height H of an inter-plate space -plates 10 of a zone Zj+i is between 0.20 and 0.95, preferably between 0.40 and 0.90, very preferably between 0.75 and 0.85.
• the height H of the inter-plate spaces 10 is constant.
• the height H of the inter-plate spaces 10 decreases when the value j increases.
• the ratio between the height H of an inter-plate space 10 of a zone Zj over the height H of an inter-plate space -plates 10 of a zone Z j+i is between 1.10 and 2.0, preferably between 1.20 and 1.60, very preferably between 1.25 and 1.50.
• the height H of the inter-plate spaces 10 increases when the value k increases.
• the ratio between the height H of an inter-plate space 10 of a zone Zk over the height H of an inter-plate space plateaus 10 of a zone Zk+i is between 0.20 and 0.95, preferably between 0.40 and 0.90, very preferably between 0.75 and 0.85.
• the height H of the inter-plate spaces 10 is constant.
• the height H of the inter-plate spaces 10 decreases when the value k increases.
• the ratio between the height H of an inter-plate space 10 of a zone Z k over the height H of a inter-plate space 10 of a zone Z k +i is between 1.10 and 2.0, preferably between 1.20 and 1.60, very preferably between 1.25 and 1.50.
• the height H of the inter-plate spaces 10 decreases when the value j increases; and in the zones Zk where k varies from y+1 to n, the height H of the inter-plate spaces 10 increases when the value k increases.
• the height H of the inter-plate spaces 10 increases when the value j increases; and in the zones Zk where k varies from y+1 to n, the height H of the inter-plate spaces 10 decreases when the value k increases.
• the height H of the inter-plate spaces 10 of the backwash zone Z x +i is greater than, equal to or less than the height H of the inter-plate spaces 10 of the extraction zone Zx .
• the height H of the inter-plate spaces 10 of the backwash zone Z x+i is lower than the height H of the inter-plate spaces 10 of the extraction zone Z x .
• the ratio between the height H of the inter-plate space 10 of the zone Z x+i over the height H of the inter-plate space 10 of the zone Z x is between 0.20 and 0.95, preferably between 0.40 and 0.90, very preferably between 0.75 and 0.85.
• the height H of each inter-plate space 10 is between 0.2 m and 1.2 m, preferably between 0.3 m and 0.7 m, very preferably between 0.3 m and 0.5m.
• Example 1 liquid-liquid extraction column with variable inter-plate space
• This example aims to describe the effect of the adjustment of the interplatform space on the homogeneity of the velocities of the continuous phase at this level.
• the column has a diameter of 4.9 m and comprises a succession of 118 perforated plates.
• the charge is injected into the intermediate plate N°71.
• the heavy solvent is injected at the top of the column on plate 1.
• the counter-solvent is injected at the bottom of the column on plate 118.
• the inter plate space has a height H1 of 0.37 m, the rest of the geometry being unchanged;
• the inter plate space is increased to a height H2 of 0.44 m, compared to the increase in flow rate of the continuous phase, the zones Z1 and Z2 corresponding to extraction sector 7;
• the third zone Z3 is between the plate 72 to 118: this zone corresponds to the backwashing sector 8, the inter plate space being of height H3 of 0.30 m.
• the height H of the inter-plate space 10 of the zone Z1 is less than the height H of a inter-plate space 10 of a zone Z2: the ratio between the height H of the inter-plate space 10 of zone Zi over the height H of the inter-plate space 10 of zone Z2 is equal to 0.84.
• Figure 4 illustrates the technical effect of this adjustment: it makes it possible to guarantee homogeneity of hydraulic operation along the column: the speed of the continuous inter-plate phase is located at all points in an optimal range. Such a solution makes it possible to guarantee constant performance whatever the flow rate variations of the continuous phase along the column while guaranteeing an optimized column height.
• the column has a diameter of 4.9 m, a height of 42 m and is made up of a succession of 118 perforated plates.
• the charge is injected into the intermediate plate N°71.
• the heavy solvent is injected at the top of the column in plate 1.
• the counter-solvent is injected at the bottom of the column on plate 118.
• FIG. 5 illustrates that, without adjustment of the interplate space, the transverse speed of the continuous phase can exceed the maximum target values and thus degrade the efficiency of the plates 13 to 71, target maximum values beyond which the transverse speed in particular disturbs the flow of the dispersed phase and causes droplets of the dispersed phase.
• the height of the inter-plate space is increased (H of 0.44 m) at any point of the column: such a solution is illustrated in figure 6; it leads to an increase in column height of 25%.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Organic Chemistry (AREA)
• Extraction Or Liquid Replacement (AREA)

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• 2021
  • 2021-12-20 FR FR2114004A patent/FR3130630B1/fr active Active
• 2022
  • 2022-12-12 WO PCT/EP2022/085390 patent/WO2023117539A1/fr not_active Ceased
  • 2022-12-12 CN CN202280084774.XA patent/CN118434483A/zh active Pending
  • 2022-12-12 EP EP22835688.7A patent/EP4452437A1/de active Pending
  • 2022-12-12 KR KR1020247020845A patent/KR20240127358A/ko active Pending
  • 2022-12-12 US US18/721,419 patent/US20250058248A1/en active Pending
  • 2022-12-16 TW TW111148410A patent/TW202337876A/zh unknown

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