WO1999062627A1 - Appareil utilise pour retirer en continu des solides formes dans les tuyauteries industrielles - Google Patents

Appareil utilise pour retirer en continu des solides formes dans les tuyauteries industrielles Download PDF

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Publication number
WO1999062627A1
WO1999062627A1 PCT/US1999/012091 US9912091W WO9962627A1 WO 1999062627 A1 WO1999062627 A1 WO 1999062627A1 US 9912091 W US9912091 W US 9912091W WO 9962627 A1 WO9962627 A1 WO 9962627A1
Authority
WO
WIPO (PCT)
Prior art keywords
chemical processing
processing vessel
hydraulic motor
chemical
processing unit
Prior art date
Application number
PCT/US1999/012091
Other languages
English (en)
Other versions
WO1999062627B1 (fr
Inventor
Ralph Michael Knox
William Jerry Wood
Original Assignee
Eastman Chemical Company
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 Eastman Chemical Company filed Critical Eastman Chemical Company
Publication of WO1999062627A1 publication Critical patent/WO1999062627A1/fr
Publication of WO1999062627B1 publication Critical patent/WO1999062627B1/fr

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Classifications

    • 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
    • B01J19/18—Stationary reactors having moving elements inside
    • 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
    • B01J19/0006—Controlling or regulating processes
    • B01J19/002—Avoiding undesirable reactions or side-effects, e.g. avoiding explosions, or improving the yield by suppressing side-reactions
    • 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
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/0015—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor
    • B01J8/002—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor with a moving instrument
    • 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
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/08—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with moving particles
    • B01J8/10—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with moving particles moved by stirrers or by rotary drums or rotary receptacles or endless belts
    • 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
    • B01F35/30—Driving arrangements; Transmissions; Couplings; Brakes
    • B01F35/32—Driving arrangements
    • B01F35/32005—Type of drive
    • B01F35/32045—Hydraulically driven
    • 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
    • B01J2219/00002—Chemical plants
    • B01J2219/00027—Process aspects
    • B01J2219/00033—Continuous processes
    • 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
    • B01J2219/00049—Controlling or regulating processes
    • B01J2219/00245—Avoiding undesirable reactions or side-effects
    • B01J2219/00252—Formation of deposits other than coke

Definitions

  • the present invention relates to the field of solids buildup removal in chemical processing.
  • the present invention is a continuous means for removing solids buildup.
  • the present invention is especially beneficial in processes wherein solid products are made from fluid reactants.
  • Processes such as the high pressure manufacture of plastics require process units suitable for the transport of vapor streams having solids entrained therein. These entrained solids often plate out or deposit on internal vessel and pipe surfaces. These resulting buildups can become large enough over time to interrupt the vapor stream flow. Product quality can thereby be adversely affected. When such buildup gets too large, the process unit must be shutdown, and opened for removal of the buildup. These shutdowns result in loss of production.
  • U.S. Patent 5,453,250 discloses using an internally contained hydraulic motor to drive a pre-mixer located downstream from the motor in as process vessel.
  • the device shown in U.S. Patent 5,453,250 overcomes contamination problems by using one of the reactants as the hydraulic motive fluid.
  • the pressurized motive fluid/reactant flows through the hydraulic motor forcing the motor wheels to turn, it is passed along into the reaction vessel to be used as a reactant.
  • the present invention is a chemical processing unit which comprises a chemical processing vessel, an apparatus having a drive means, and a closed loop hydraulic motor controllably connected to the drive means.
  • the apparatus and the closed loop hydraulic motor are disposed inside the chemical processing vessel.
  • the present invention further includes a process of forming a chemical product which comprises, while forming a chemical product inside a chemical processing vessel, sufficiently operating an apparatus by way of a hydraulic motor controllably connected to the apparatus so that the apparatus performs a desired function.
  • the present process is characterized by the fact that the hydraulic motor and the apparatus are disposed inside the chemical processing vessel and the hydraulic motor is powered by a closed stream of a motive fluid.
  • Figure 1 shows a schematic illustration of an embodiment of the chemical processing unit of the present invention wherein a three-compartment chemical processing vessel contains a scraping apparatus controllably connected to a closed loop hydraulic motor assembly.
  • the applicants have discovered a chemical processing unit which includes a means of removing solids buildup in process piping while overcoming the problems previously experienced with using electric and hydraulic motor-driven scrapers inside a continuous chemical processing unit.
  • the present chemical processing unit comprises a chemical processing vessel, an apparatus having a drive means, and a closed loop hydraulic motor controllably connected to the drive means.
  • the apparatus and the closed loop hydraulic motor being disposed inside the chemical processing vessel.
  • a closed loop hydraulic motor is considered to be disposed inside a chemical processing vessel even when a portion of the closed loop is disposed outside of the chemical processing vessel.
  • motive fluid In order for motive fluid to be capable of circulating through the closed motive fluid loop of the present hydraulic motor assembly, accessibility to the closed motive fluid loop is most conveniently made from outside of the chemical processing vessel. For instance, a means for pumping the motive fluid through the circulation loop, and means for replacing motive fluid would most usefully be situated outside of the chemical processing vessel.
  • the closed motive fluid loop of the chemical processing unit of the present invention preferably protrudes through the body of the chemical processing vessel at two or more essentially airtight entry points so that the closed motive fluid loop is partially disposed outside of the chemical processing vessel.
  • the chemical processing unit of the present invention is most beneficial when the chemical processing vessel is a continuous chemical processing reactor.
  • Continuous chemical processing vessels suitable for use in the present invention include any vessels operating at other than ambient pressures, such as polymerization reactors and their auxiliary equipment.
  • the more preferred chemical processing vessels are suitable for producing solids from fluid reactants. Examples of such more preferred chemical processing vessels includes fluid bed reactors, storage vessels, mixing tanks and continuously stirred tank reactors.
  • the chemical processing vessel of the present invention is not limited in the number of compartments therein, including relatively small pipes connecting larger processing vessels.
  • the number of compartments in the chemical processing vessel is preferably greater than one.
  • the hydraulic motor-driven apparatus of the chemical processing vessel of the present invention is contained within the chemical processing vessel. This provides the benefit of allowing the continuous, intermittent, or occasional operation of the present apparatus without shutting down the chemical production being conducted in the chemical processing vessel.
  • the apparatus can be any useful apparatus which can be powered by the closed loop hydraulic motor of the present invention by way of an drive means controllably attached to the motor.
  • Suitable apparatuses of the present invention are apparatuses such as rotary and reciprocating scrapers, rotary and reciprocating valving means, mixers, internal process monitoring devices, machinery drives, compressors and pumps.
  • the preferred apparatus of the present invention is a scraper having a shaft from which protrude a plurality of scraping blades.
  • the apparatus drive means may be any of the devices normally driven by a hydraulic motor.
  • the drive means is preferably a rotatable or reciprocatable drive means such as a shaft portion of the apparatus.
  • a preferred embodiment of the chemical processing unit of the present invention is illustrated by Figure 1.
  • the preferred chemical processing unit of the present invention comprises a chemical processing system 1 containing three compartments, an upstream processing vessel 2, a downstream processing vessel 3, and a connecting pipe 4.
  • the chemical processing unit illustrated in Figure 1 contains a scraper apparatus 5 having a rotatable shaft 6 about which protrude a plurality of scraping blades 7.
  • One end of the shaft 6 is sufficiently disposed on a portion of the hydraulic motor 8 so that the hydraulic motor controls movement of the scraper.
  • a closed motive fluid loop 9 flowing through the hydraulic motor 8 and extending outside of the chemical processing vessel at two points in the sidewall of the vessel.
  • the placement of the closed hydraulic motor assembly and the apparatus controlled thereby within the chemical process vessel is not limited by any process parameters such as the particular phase of the reaction being conducted in the immediate region of the vessel or the relative pressure difference between the chemical processing vessel compartment and the enclosed hydraulic motor assembly. Therefore, a greater range of uses of various hydraulically controlled apparatuses can be enjoyed using the chemical processing unit of the present invention.
  • the present invention further includes a process of forming a chemical product using the chemical processing unit of the present invention.
  • a chemical product is formed inside the chemical processing vessel of the present invention while sufficiently operating an apparatus by way of a hydraulic motor so that the apparatus performs a desired function.
  • the present process is characterized by the fact that the hydraulic motor and the apparatus are disposed inside the chemical processing vessel and the hydraulic motor is powered by a closed stream of a motive fluid.
  • the function carried out by the apparatus of the present invention is a useful function such as scraping, mixing, monitoring a process parameter, or controlling a portion of the chemical process vessel such as a valve.
  • the preferred process of the present invention entails operating a scraper to scrape solids buildup from the inner walls of the chemical processing vessel.
  • the chemical reaction conducted in the process of the present invention is preferably a reaction wherein the reactants are at least substantially fluid materials.
  • reactant as used herein, is defined as including any material fed into the reactor including chemical reactants, catalysts, additives, and such. Further, it is more preferred that a fluid reactant of the chemical reaction serve as the motive fluid used to power the closed loop hydraulic motor.
  • the most preferred embodiment of the present process comprises conducting a chemical reaction wherein substantially fluid reactants are reacted to form a solid product and the hydraulic motor is powered by a fluid reactant of said chemical reaction. Such embodiment of the present invention is very beneficial in ameliorating the effects of contamination occurring upon the leaking of motive fluid in the closed hydraulic motor apparatus into the open area of the reaction vessel.
  • the preferred chemical reaction carried out in the process of the present invention is a polymerization reaction carried out under polymerization conditions at a temperature of about 270°C to 300°C and a pressure of between 0 to about 10 mm
  • the present process can be usefully employed in the production of polyester terephthalate ("PET").
  • PET polyester terephthalate
  • the PET polymerization reaction is operated under vacuum.
  • Ethylene glycol vapor is continuously removed from the chemical processing vessel through a crossover pipe to a spray condenser where the ethylene glycol vapor is condensed and removed.
  • the solid PET product entrained in the vapor stream tend to plate out on the inner walls of this crossover pipe until vapor flow is restricted or stopped altogether.
  • Product quality is detrimentally affected when the ethylene glycol vapor can no longer be removed from the reactor.
  • Such solids buildup must be removed before normal production can resume.
  • the production process had to be shutdown, and the reactor compartments opened to allow removal of the solids.
  • the process of the present invention would be usefully employed in the production of PET by continuously operating an internally contained, hydraulically driven scraper with an ethylene glycol motive fluid while the PET reaction is being conducted.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Abstract

L'invention porte sur une unité de traitement chimique comprenant un réceptacle de traitement contenant un appareil commandé par un moteur hydraulique à circuit fermé. L'appareil et le moteur hydraulique sont placés à l'intérieur du réceptacle de traitement chimique. L'invention porte également sur un procédé permettant d'effectuer une réaction chimique dans cette unité de traitement tout en faisant fonctionner simultanément l'appareil au moyen du moteur hydraulique à circuit fermé. L'appareil est de préférence un racloir permettant de retirer des solides formés à l'intérieur du réceptacle de traitement chimique.
PCT/US1999/012091 1998-06-03 1999-05-29 Appareil utilise pour retirer en continu des solides formes dans les tuyauteries industrielles WO1999062627A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US9027298A 1998-06-03 1998-06-03
US09/090,272 1998-06-03

Publications (2)

Publication Number Publication Date
WO1999062627A1 true WO1999062627A1 (fr) 1999-12-09
WO1999062627B1 WO1999062627B1 (fr) 2000-01-27

Family

ID=22222062

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/012091 WO1999062627A1 (fr) 1998-06-03 1999-05-29 Appareil utilise pour retirer en continu des solides formes dans les tuyauteries industrielles

Country Status (1)

Country Link
WO (1) WO1999062627A1 (fr)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2647885A (en) * 1951-09-28 1953-08-04 Du Pont Production of polyethylene terephthalate using antimony trioxide as polymerization catalyst
GB752524A (en) * 1954-08-20 1956-07-11 Friedrich Heinrich Flottmann Improvements in or relating to emulsifying devices
US2979237A (en) * 1952-07-28 1961-04-11 Coast Pro Seal & Mfg Co Applicator and mixer for viscous materials
GB904757A (en) * 1960-08-03 1962-08-29 British Petroleum Co A method of and apparatus for improving inter-phase contact
DE2419305A1 (de) * 1973-04-27 1974-11-07 Vogelbusch Gmbh Antriebseinrichtung fuer rotierende begasungs- und/oder ruehrvorrichtungen von fermentern sowie verfahren zur regelung der drehzahl solcher vorrichtungen
JPS5153594A (fr) * 1974-11-05 1976-05-12 Toyo Boseki
US4264214A (en) * 1978-06-09 1981-04-28 Nordson Corporation Gear motor/mixer
EP0054003A2 (fr) * 1980-12-05 1982-06-16 Gebrüder Peterhans AG Appareil pour agiter, en particulier pour mélanger et/ou sécher, une matière à l'aide d'un récipient et d'une vis sans fin
GB2212071A (en) * 1987-11-10 1989-07-19 Totton Pumps Ltd Apparatus for mixing or agitating liquids
WO1994006551A1 (fr) * 1992-09-15 1994-03-31 The Maitland Company Transport et rejet de dechets dangereux
US5453250A (en) * 1992-07-16 1995-09-26 Bayer Aktiengesellschaft Apparatus for the preparation of a flowable reaction mixture

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2647885A (en) * 1951-09-28 1953-08-04 Du Pont Production of polyethylene terephthalate using antimony trioxide as polymerization catalyst
US2979237A (en) * 1952-07-28 1961-04-11 Coast Pro Seal & Mfg Co Applicator and mixer for viscous materials
GB752524A (en) * 1954-08-20 1956-07-11 Friedrich Heinrich Flottmann Improvements in or relating to emulsifying devices
GB904757A (en) * 1960-08-03 1962-08-29 British Petroleum Co A method of and apparatus for improving inter-phase contact
DE2419305A1 (de) * 1973-04-27 1974-11-07 Vogelbusch Gmbh Antriebseinrichtung fuer rotierende begasungs- und/oder ruehrvorrichtungen von fermentern sowie verfahren zur regelung der drehzahl solcher vorrichtungen
JPS5153594A (fr) * 1974-11-05 1976-05-12 Toyo Boseki
US4264214A (en) * 1978-06-09 1981-04-28 Nordson Corporation Gear motor/mixer
EP0054003A2 (fr) * 1980-12-05 1982-06-16 Gebrüder Peterhans AG Appareil pour agiter, en particulier pour mélanger et/ou sécher, une matière à l'aide d'un récipient et d'une vis sans fin
GB2212071A (en) * 1987-11-10 1989-07-19 Totton Pumps Ltd Apparatus for mixing or agitating liquids
US5453250A (en) * 1992-07-16 1995-09-26 Bayer Aktiengesellschaft Apparatus for the preparation of a flowable reaction mixture
WO1994006551A1 (fr) * 1992-09-15 1994-03-31 The Maitland Company Transport et rejet de dechets dangereux

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