GB2323799A - Aqueous dispersions - Google Patents

Aqueous dispersions Download PDF

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Publication number
GB2323799A
GB2323799A GB9706985A GB9706985A GB2323799A GB 2323799 A GB2323799 A GB 2323799A GB 9706985 A GB9706985 A GB 9706985A GB 9706985 A GB9706985 A GB 9706985A GB 2323799 A GB2323799 A GB 2323799A
Authority
GB
United Kingdom
Prior art keywords
components
emulsion
water
injection
pressure
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Withdrawn
Application number
GB9706985A
Other versions
GB9706985D0 (en
Inventor
Barrie Charles Singleton
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB9706985A priority Critical patent/GB2323799A/en
Publication of GB9706985D0 publication Critical patent/GB9706985D0/en
Publication of GB2323799A publication Critical patent/GB2323799A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/41—Emulsifying
    • B01F23/4105—Methods of emulsifying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/51—Methods thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/56—Mixing liquids with solids by introducing solids in liquids, e.g. dispersing or dissolving
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/59—Mixing systems, i.e. flow charts or diagrams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/90—Heating or cooling systems
    • B01F2035/98—Cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/90—Heating or cooling systems
    • B01F2035/99—Heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/41—Emulsifying
    • B01F23/414—Emulsifying characterised by the internal structure of the emulsion
    • B01F23/4146—Emulsions including solid particles, e.g. as solution or dispersion, i.e. molten material or material dissolved in a solvent or dispersed in a liquid

Abstract

Aqueous dispersions containing a high melting point fusible solid are obtained by injecting the desired components of the dispersion into a heated pressurised flow of water to obtain an emulsion which is cooled to obtain a stable dispersion. Typically a centrifugal pump 1 feeds pressurised water to a heat exchanger 2 and pumps 3 and 4 feed liquid components and a hopper 6 feeds a solid component to a continuous cavity pump 5 for injection into a mixing point 7 where the liquids and solids are mixed with the pressurised hot water and heated 8 to form the dispersion.

Description

METHOD AND APPARATUS FOR PREPARING AQUEOUS DISPERSIONS OF FUSIBLE NATERIALS Stable dispersions of fusible materials in water find increasing application and are generally preferred to solvent systems. High melting point materials have desired properties but require temperatures above the boiling point of water te process thus requiring a pressurised system. Currently this is achieved using a pressure vessel and a "charge-seal-heat/stir-ccol-discharge" cycle.
Pressure vessels have been used for many years; they need to be large to be economic. Stored energy is high at raised temperature with associated hazard and legislation. Cycle time is long with risk of high ost if plant malfunctions or fails and with risk of material degradation. This type of process is not readily adapted to conserve water and energy.
The object of this invention is to emulsify high temperature materials while minimising stored energy, failure cost, water use and energy consumption with improved product quality and process flexibility.
Accordingly this invention provides a method and apparatus for making continuously, stable, aqueous, finely divided dispersions cctaizini; at least one high melting point fusible solid ingredient; in which, into the pressurised heated water flow, are injected the other components either together or separately and in an appropriate ratio such that, with agitation and heating, an emulsion is formed which may be cooled to a stable dispersion.
A preferred embodiment will now be described with reference te the accompanying schematic diagram (figure 1).
A multi-stage centrifugal pump (1) feeds pressurised Cold water to one side of a heat-exchanger (2) where the water temperature is raised by heat from the counterflow of finished product. The metering pumps (3) and (4) feed liquid components to the throat of the auger-feed continuous cavity pump (5) which also receives solid material in finely divided form from the hopper C) and the combined materials are delivered into the water flow at point (7). The crude mixture then passes over electric heaters (8) through static mixer (9) through filter (10) returning through heat-exchanger (2) through pressure contrcl valve (11) to receiver (12).
Pumps (3) (4) and (5) heater (8) and flow control valve (11) are computer controlled in response to inputs from load cells (13) pressure sensors (14) temperature sensors (15) and pR sensor (16).

Claims (14)

1 Method and apparatus for making continuously: stable, aqueous, finely divided dispersions containing at least one high melting point fusible solid ingredient; in which, into the pressurised heated water flow are injected the other components either together or separately and in an appropriate ratio such that, with agitation and heating, an emulsicn is formed which may be cooled to a stable dispersion.
2 Method and apparatus as claimed in Claim 1 wherein pressure is developed and flow initiated throughout the pipework and other components by a mltistage centrifugal pump with restrictable bypass.
3 Method and apparatus as claimed in Claim 1 or 2 wherein discharge rate is controlled by static or dynamic means thereby regulating process pressure.
4 Method and apparatus as claimed in Claim 1 wherein the injection pum is the progressive cavity type.
5 Method and apparatus as claimed in Claim G wherein the Progressive Cavity pump is mounted substantially vertically with its suction throat at the per end.
6 Method and apparatus as claimed in Claim 5 wherein at least one solid and one liquid component meet at or adjacent to the suction throat of ~~ progressive cavity pump.
7 Method and apparatus as claimed in Claim 6 wherein one or more water soluble components may be dissolved either together or separately before further combination or injection.
8 Method and apparatus as claimed in any preceding claim wherein a heating module is located downstream of the injection point.
9 method and apparatus as claimed In Claim 8 wherein sufficient length of pie is provided downstream of the heating module as a delay zone to allow time for solid particles to melt.
10 Method and apparatus as claimed in Claim 9 wherein static or dynamic means of mixing are provided downstream from the delay zone to ensure l:omogeneity of the emulsion.
11 Method and apparatus as claimed in any preceding claim wherein a et exchanger is so placed as to pass heat from the homogeneous emulsion to the feed water being so configured as to cool the emulsion to a stable dispersion and to elevate the temperature of the feed water.
12 Method and apparatus as claimed in any preceding claim wherein relative proportions of all components are monitored by reference to one or more sensors measuring one or more of flow-rate weight-change and pH.
13 Methcd and apparatus as claimed in any preceding claim wherein process conditions are monitored by reference to senscrs measuring temperature and pressure 14 Method and apparatus as claimed in Claims 12 or 13 wherein a process computer receives inputs from all sensors and delivers outputs to one or more of valves pumps and heaters.
14 Method and apparatus substantially as descrlbeb herein with reference to Figure 1 of the accompanying diagram.
GB9706985A 1997-04-05 1997-04-05 Aqueous dispersions Withdrawn GB2323799A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9706985A GB2323799A (en) 1997-04-05 1997-04-05 Aqueous dispersions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9706985A GB2323799A (en) 1997-04-05 1997-04-05 Aqueous dispersions

Publications (2)

Publication Number Publication Date
GB9706985D0 GB9706985D0 (en) 1997-05-21
GB2323799A true GB2323799A (en) 1998-10-07

Family

ID=10810388

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9706985A Withdrawn GB2323799A (en) 1997-04-05 1997-04-05 Aqueous dispersions

Country Status (1)

Country Link
GB (1) GB2323799A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB431134A (en) * 1933-09-29 1935-07-01 Du Pont Production of finely divided substances, dispersions and emulsions
GB1383471A (en) * 1972-01-11 1974-02-12 Texaco Ag Process for the continuous production of aqueous paraffin emulsions
GB2011916A (en) * 1978-01-05 1979-07-18 Rhone Poulenc Ind Continuous method for making an aqueous dispersion of a homogeneous phase containing at least one solid fusible ingredient
JPH078772A (en) * 1993-06-25 1995-01-13 Nittetsu Mining Co Ltd Production device for water based dispersion liquid

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB431134A (en) * 1933-09-29 1935-07-01 Du Pont Production of finely divided substances, dispersions and emulsions
GB1383471A (en) * 1972-01-11 1974-02-12 Texaco Ag Process for the continuous production of aqueous paraffin emulsions
GB2011916A (en) * 1978-01-05 1979-07-18 Rhone Poulenc Ind Continuous method for making an aqueous dispersion of a homogeneous phase containing at least one solid fusible ingredient
JPH078772A (en) * 1993-06-25 1995-01-13 Nittetsu Mining Co Ltd Production device for water based dispersion liquid

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WPI Accession No. 95-084532/12 & JP 07 008 772 A *

Also Published As

Publication number Publication date
GB9706985D0 (en) 1997-05-21

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)