US3705787A - Method for regulating the temperature and the conversion in a polymerization reactor and apparatus suitable to realize the same - Google Patents

Method for regulating the temperature and the conversion in a polymerization reactor and apparatus suitable to realize the same Download PDF

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Publication number
US3705787A
US3705787A US56896A US3705787DA US3705787A US 3705787 A US3705787 A US 3705787A US 56896 A US56896 A US 56896A US 3705787D A US3705787D A US 3705787DA US 3705787 A US3705787 A US 3705787A
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Prior art keywords
temperature
conversion
regulating
fuel
solvent
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Expired - Lifetime
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US56896A
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English (en)
Inventor
Roberto Carli
Silvano Gordini
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SnamProgetti SpA
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SnamProgetti SpA
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    • 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

Definitions

  • Said absorbent material 120 abuts through one of said mesh screens 121 against a tip portion 122a of an operating section 122.
  • Said operating section 122 is formed with a central through-bore l22b longitudinally extending over its full length thereof and rigidly connected to a regulating tubular means 123 in the downward position 1220 thereof.
  • Said regulating tubular means 123 in rigid connection with said operating section 122, has a portion 124 threaded so as to engage with threads 125 of said main outer cylindrical body 102. Accordingly, said regulating tubular means 123 may be rotated to some predetermined extent.
  • said regulating tubular means 123 extends downwardly beyond said inner threaded ring 105; provided to fix said main outer cylindrical body 102 to said upper and bottom walls 101a, 1011) of said fuel reservoir tank 101, mentioned above; and accommodates a valve member 126 provided telescopically therein.
  • the said regulating tubular means also 123 has on the inner side thereof a boss 127 to seat a packing 128 which is in a groove 129 formed on the confines of said valve member 126. Said packing 128 is normally seated against said boss 127 of said regulating tubular means 123 in order to seal the communication between said fuel reservoir tank 101 and the atmosphere.
  • the abovementioned valve member has two portions 130, 131, one of which extends in an inward direction to form a seat 130a for a spring 132, interposed between said operating section 122 and said seat 130a of said valve member 126, to urge said valve member 126 to its outward direction until said packing 128 is brought into its normal position on said seat 127.
  • the other portion 131 extends in an outward direction in an opening 133 defined by said regulating tubular means 123.
  • Portion 131 is adapted to abut a connecting tube (not shown) of a refill gas container.
  • the gas in said refill gas container enters said fuel reservoir tank 101 through a second side aperture 135 made on said main outer cylindrical body 102 near to a first side aperture 134 of said regulating tubular means 123.
  • a third aperture 136 formed on an upper portion above said second aperture 135 of said main outer cylindrical body 102 is a third aperture 136 adapted to make communication between said fuel reservoir tank 101 and a chamber wadded quantity of the fuel gas through said third side aperture 136 to said absorbent material 120 arranged under said transverse wall 118 of said main outer cylindrical body 102.
  • Shown by numeral 138 is a gasket which serves to positively seal the communication between the atmosphere and said fuel reservoir tank 101.
  • the gas fuel stored in a fuel reservoir tank 101 is emitted from an axial bore 107 through said through-bore 119 upon release of the engagement between said resilient member and said convex section 117 via upward movement of said nozzle cylinder 106 by means of a well-known nozzle actuating member (not shown).
  • gas emission is effected by lifting action due to means relevant with said nozzle actuating member (not shown) since said nozzle cylinder 106 is in its rest position depressed downwardly to contact with said convex section 117 under the influence of said spring 110.
  • the flame is conveniently controlled by the user's hand.
  • the gas fuel that will be discharged through said axial bore 107 of said nozzle cylinder 106 always passes through said absorbent material 120.
  • Said regulating tubular means 123 is turnable in threaded engagement with said main outer cylindrical body 102. Consequently, turned to a clockwise direction, said tip portion 122a of said operating section 122 compresses said absorbent material 120 to decrease the rate of the gas fuel flowing through said absorbent material 120 and the height of the flame is positively lowered. Turned in the opposite direction, said tip portion 122a of said operating section 122 backs off from its initial position, and the density of said absorbent material 120 is lowered with the resultant flame being higher than before.
  • said connecting tube of said fuel refill container is applied to said opening 133.
  • Said connecting tube of said fuel refill container contacts directly with said portion 131 of said valve member 126 to move said valve member 126 from its normal position in sealing relation with said boss 127 to its upper, open position against an action of said spring 132.
  • said valve member 126 is opened, the fuel gas stored in said fuel refill container flows into said fuel reservoir tank 101 via said first side aperture 134 of said regulating tubular means 123 and secondly through said second side aperture 135 of said main outer cylindrical body 102.
  • a valve for use in a gas fueled cigarette lighter comprising, in combination,
  • a main outer cylindrical body secured to the upper and lower walls of a fuel reservoir tank, said main outer cylindrical body having an axially-hollow interior and a transverse opening communicating between said fuel reservoir tank and said axiallyhollow interior;
  • a fuel discharge nozzle mounted on the upper portion of said main outer cylindrical body, adapted to emit fuel communicated through said axiallyhollow interior of said main outer cylindrical body;
  • an adjusting member positioned in the axially-hollow interior of said main outer cylindrical body between said transverse opening and said fuel discharge nozzle, adaptable to change the amount of fuel communicated to said fuel discharge nozzle;
  • the present invention relates to a method for regu lating the temperature and the conversion in continuous polymerization reactors, of shaken vessel type, where the temperature regulation is a function of the thermal conditions of the reactants.
  • the course of a polymerization reaction is characterized not only by the conversion of monomer into polymer but also by the molecular weight and by the polymer structure.
  • the viscosity depends on these three factors and therefore it cannot be utilized for the conversion measurement.
  • Conversion measurements can be realized by means of laboratory analysis on drawn samples, but, owing to the time required, such tests are not useful for a continuous regulation.
  • the performances required of a regulating system for a delicate process such as the one for the production of polymers, in particular stereospecific polymers, are of extreme sensitivity and swift response, especially as far as the polymerization temperature is concerned.
  • the present invention relates to a regulation method characterized by an extremely sensitive and swift response, together with the capability of a swift damping of any oscillations around the equilibrium conditions in the system.
  • the present invention relates also to apparatus which is a suitable disposition of devices, capable of realizing said method.
  • the above mentioned method is based on the evaluation of the heat generated during the polymerization reaction in order to have an immediate measurement of conversion.
  • the generated heat is, once the system is known correlated, with the temperature ditference between inlet and outlet flows.
  • the present method utilizes a temperature detectingtransmitting equipment, which is in contact with the reaction products within the reactor or on their outlet line.
  • the transmitted value is received by a temperature regulator, which compares said value with a given one coming from the outside; by comparing them the regulator generates a signal for a second temperature regulator whereto also the value of temperature of the solventcatalyst mixture entering the reactor, arrives through a detecting-transmitting equipment.
  • said second regulator By comparing the received data said second regulator generates a signal acting on a mixing device, which, by mixing solvent streams at different temperatures, generates a solvent stream at the desired temperature.
  • the detecting-transmitting equipment which is kept in contact with the inlet line of the solvent-catalyst mixture, generates a control signal for a third temperature regulator which compares the received datum with one imposed from the outside.
  • Said regulator generates a signal acting on a valve which regulates the catalyst flow.
  • temperature detecting-transmitting equipments 3 temperature control equipments 2 flow control equipments- 1 programmer-processor device.
  • the monomer is fed through line lat constant temperature and flow rate.
  • the line 3 by means of which the catalyst dissolved in the solvent at constant composition is fed at constant temperature and variable flow rate, and line 4, by means of which substantially all the solvent is introduced at variable temperature, join in line 2.
  • the solvent flow rate through lines 3 and 4 is regulated so as to have a constant flow rate in line 2.
  • the lines 1 and 2 merge in the polymerization reactor 5, wherein temperature and conversion must be kept constant.
  • the finished product is discharged by means of the line 6.
  • the signal leaving the regulator 8 is compared in the regulator 10 with the signal coming from the detecting-transmitting equipment 11, which measures the temperature at which line 2 feeds solvent and catalyst to the reactor 5.
  • Said valve 12 regulates the ratio of the flows in the lines 13 and 14 so as to keep in the line 2 the temperature value imposed by the regulator 8.
  • a flow measuring-controlling equipment 15 is placed on the line 2; said equipment by means of the regulating valve 16 conforms the flow in line 4 to the flow changes in line 3 so as to have in 2 a constant flow.
  • the temperature measured by the organ 11 is correlated with the amount of heat which is generated in the reactor 5 and consequently with the desired conversion. Therefore the regulator 17 has been included, wherein a comparison is carried out between the signal leaving the measuring equip centration.
  • the novel inhibitor of the present invention may be employed in any aqueous environment Where corrosion of ferrous metal in the system is a problem.
  • Such systems include, but are not limited to, recirculating water systems, tanks, pipelines, radiators, and other aqueous based can be seen that virtually ferrous metal contacting systems.
  • superior corrosion inhibitor characteristics can be achieved by adding to creosote compositions 3,3'-methylene bis-benzoic acid at a level ranging from 0.05 to 1%, preferably 0.1% by weight, based on the weight of the creosote composition.
  • the employment of such creosote compounds in the conventional manner results in minimization or elimination of corrosion generally encountered in such situations, when the creosote also contains pentachlorophenol as an adjuvant to its protective action.
  • the method of inhibiting corrosion of ferrous metal materials which comprises contacting said metal in an aqueous environment with an eflFective amount of 3,3- methylene bis-benzoic acid.
  • the method of inhibiting corrosion of ferrous metal materials which comprises contacting said metal with methylene bis-benzoic acid in an aqueous solution at a level ranging from 60 to 150 p.p.m.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Polymerisation Methods In General (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Other Resins Obtained By Reactions Not Involving Carbon-To-Carbon Unsaturated Bonds (AREA)
US56896A 1969-07-21 1970-07-21 Method for regulating the temperature and the conversion in a polymerization reactor and apparatus suitable to realize the same Expired - Lifetime US3705787A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1990069 1969-07-21

Publications (1)

Publication Number Publication Date
US3705787A true US3705787A (en) 1972-12-12

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US56896A Expired - Lifetime US3705787A (en) 1969-07-21 1970-07-21 Method for regulating the temperature and the conversion in a polymerization reactor and apparatus suitable to realize the same

Country Status (11)

Country Link
US (1) US3705787A (de)
JP (1) JPS492020B1 (de)
BE (1) BE753355A (de)
CA (1) CA945346A (de)
DE (1) DE2036205B2 (de)
ES (1) ES382453A1 (de)
FR (1) FR2055172A5 (de)
GB (1) GB1310975A (de)
LU (1) LU61346A1 (de)
NL (1) NL7010756A (de)
ZA (1) ZA704695B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4185073A (en) * 1976-07-26 1980-01-22 Standard Oil Company (Indiana) Apparatus for iso- or terephthalic acid production in and recovery from benzoic acid-water solvent system
US5521392A (en) * 1994-04-29 1996-05-28 Efos Canada Inc. Light cure system with closed loop control and work piece recording

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4185073A (en) * 1976-07-26 1980-01-22 Standard Oil Company (Indiana) Apparatus for iso- or terephthalic acid production in and recovery from benzoic acid-water solvent system
US5521392A (en) * 1994-04-29 1996-05-28 Efos Canada Inc. Light cure system with closed loop control and work piece recording

Also Published As

Publication number Publication date
JPS492020B1 (de) 1974-01-18
ES382453A1 (es) 1973-04-16
NL7010756A (de) 1971-01-25
DE2036205A1 (de) 1971-04-29
FR2055172A5 (de) 1971-05-07
DE2036205B2 (de) 1972-02-24
BE753355A (fr) 1970-12-16
ZA704695B (en) 1972-01-26
LU61346A1 (de) 1970-09-16
CA945346A (en) 1974-04-16
GB1310975A (en) 1973-03-21

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