WO1999062627A1 - Apparatus for continuously removing solids buildup from process piping - Google Patents

Apparatus for continuously removing solids buildup from process piping 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
French (fr)
Other versions
WO1999062627B1 (en
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/en
Publication of WO1999062627B1 publication Critical patent/WO1999062627B1/en

Links

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.

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

Abstract

Disclosed herein is a chemical processing unit comprising a chemical processing vessel containing an apparatus which is controlled by a closed loop hydraulic motor. Both the apparatus and the hydraulic motor are disposed inside the chemical processing vessel. Also disclosed is a process of conducting a chemical reaction inside the present chemical processing unit while simultaneously operating the apparatus by way of the closed loop hydraulic motor. The apparatus is preferably a scraper suitable for removing solids buildup from inside the chemical processing vessel.

Description

APPARATUS FOR CONTINUOUSLY REMOVING SOLIDS BUILDUP FROM PROCESS PIPING
FIELD OF THE INVENTION 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.
BACKGROUND OF THE INVENTION
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.
The use of an electric scraper would be unacceptable for use in such a pressurized process for two main reasons. Firstly, an electric motor contained inside a pressurized reaction vessel poses a great risk of sparking and causing an explosion.
Secondly, if an internal scraper were driven by an external electric motor, a connecting rotating motor shaft would need to pierce through a process vessel wall. The shaft penetration point could not be completely sealed to allow for shaft rotation. So the shaft entrance would be a likely point of contamination and leakage. 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. As 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. However, it is not always useful to introduce high pressure reactant at points within the reaction vessel most likely to have solids buildup. The introduction of such a reactant stream could disturb the chemical reaction equilibrium and adversely change the pressure level in that part of the process unit.
In light of the above problems, it would be desirable to provide a hydraulically driven means for continuously removing unwanted solids buildup from the internal walls of a reaction vessel while maintaining the integrity of the process being conducted inside the reaction vessel. Such means should not pose a risk of leakage or contamination.
SUMMARY OF THE INVENTION 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.
BRIEF DESCRIPTION OF THE DRAWING
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.
DETAILED DESCRIPTION OF THE INVENTION 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.
For the purpose of clearly describing the present invention, 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. 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. In order to maintain the integrity of a pressurized process conducted inside the chemical processing unit, 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. Referring to 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. Also shown in Figure 1 is 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.
It is a particular benefit of the present invention that 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. In the present process, 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. The term "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
Hg. For example, the present process can be usefully employed in the production of polyester terephthalate ("PET"). In such process, 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. Heretofore, 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.
Although the invention has been described in some detail in the foregoing for the purpose of illustration, it is to be understood that such detail is solely for that purpose and that variations can be made therein by those skilled in the art without departing from the scope of the invention claimed.

Claims

1. A chemical processing unit comprising: a chemical processing vessel, an apparatus having a drive means, and a closed loop hydraulic motor being controllably connected to said drive means, with said apparatus and said closed loop hydraulic motor being disposed inside said chemical processing vessel.
2. The chemical processing unit of claim 1 wherein said closed loop hydraulic motor has a motive fluid loop which protrudes through said chemical processing vessel at a plurality of two or more essentially airtight entry points so that a portion of said motive fluid loop is disposed outside said chemical processing vessel.
3. The chemical processing unit of claim 1 wherein said chemical processing vessel is a continuous chemical reactor.
4. The chemical processing unit of claim 1 wherein said chemical processing vessel comprises two or more compartments.
5. The chemical processing unit of claim 4 wherein said apparatus is a scraper, a valve, a mixer, a pump, a compressor, a machinery drive, or a monitoring device.
6. The chemical processing unit of claim 1 wherein said drive means is a rotatable drive means or a reciprocatable drive means.
The chemical processing unit of claim 6 wherein said apparatus is a scraper.
8. A process comprising: while forming a chemical product inside a chemical processing vessel, sufficiently operating an apparatus by way of a hydraulic motor controllably connected to said apparatus so that said apparatus performs a function, said process characterized by said hydraulic motor and said apparatus being disposed inside said chemical processing vessel and said hydraulic motor being powered by a closed stream of a motive fluid.
9. The process of claim 8 wherein said function is mixing, scraping, monitoring a process parameter, or controlling said chemical processing vessel.
10. The process of claim 8 wherein said apparatus is a scraper, further wherein said function is removing a buildup of solid material inside said chemical processing vessel.
11. The process of claim 8 wherein said chemical product is a solid formed from a fluid reactant.
12. The process of claim 11 further wherein said fluid reactant is the same fluid as said motive fluid.
13. The process of claim 8 conducted under polymerization conditions at a temperature of about 270┬░C to 300┬░C and a pressure of between 0 to about 10 mm Hg.
PCT/US1999/012091 1998-06-03 1999-05-29 Apparatus for continuously removing solids buildup from process piping WO1999062627A1 (en)

Applications Claiming Priority (2)

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

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WO1999062627A1 true WO1999062627A1 (en) 1999-12-09
WO1999062627B1 WO1999062627B1 (en) 2000-01-27

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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 (en) * 1973-04-27 1974-11-07 Vogelbusch Gmbh Hydraulic motor drive for fermentation plant - with control system measuring operational data for optimal efficiency
JPS5153594A (en) * 1974-11-05 1976-05-12 Toyo Boseki
US4264214A (en) * 1978-06-09 1981-04-28 Nordson Corporation Gear motor/mixer
EP0054003A2 (en) * 1980-12-05 1982-06-16 Gebrüder Peterhans AG Apparatus for agitating, especially mixing and/or drying a stock by means of a receptacle and a screw
GB2212071A (en) * 1987-11-10 1989-07-19 Totton Pumps Ltd Apparatus for mixing or agitating liquids
WO1994006551A1 (en) * 1992-09-15 1994-03-31 The Maitland Company Hazardous waste transportation and disposal
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 (en) * 1973-04-27 1974-11-07 Vogelbusch Gmbh Hydraulic motor drive for fermentation plant - with control system measuring operational data for optimal efficiency
JPS5153594A (en) * 1974-11-05 1976-05-12 Toyo Boseki
US4264214A (en) * 1978-06-09 1981-04-28 Nordson Corporation Gear motor/mixer
EP0054003A2 (en) * 1980-12-05 1982-06-16 Gebrüder Peterhans AG Apparatus for agitating, especially mixing and/or drying a stock by means of a receptacle and a screw
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 (en) * 1992-09-15 1994-03-31 The Maitland Company Hazardous waste transportation and disposal

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