US3836339A - Reactor for the production of lead oxide with a high free-lead content - Google Patents

Reactor for the production of lead oxide with a high free-lead content Download PDF

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US3836339A
US3836339A US00260456A US26045672A US3836339A US 3836339 A US3836339 A US 3836339A US 00260456 A US00260456 A US 00260456A US 26045672 A US26045672 A US 26045672A US 3836339 A US3836339 A US 3836339A
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chamber
lead
stirrer
reactor
air
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A Lesbros
M Brachet
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Societe Miniere et Metallurgique de Penarroya
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G21/00—Compounds of lead
    • C01G21/02—Oxides
    • C01G21/06—Lead monoxide [PbO]
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/14—Compounds of lead
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/80—Particles consisting of a mixture of two or more inorganic phases
    • C01P2004/82—Particles consisting of a mixture of two or more inorganic phases two phases having the same anion, e.g. both oxidic phases
    • C01P2004/84—Particles consisting of a mixture of two or more inorganic phases two phases having the same anion, e.g. both oxidic phases one phase coated with the other
    • C01P2004/88—Thick layer coatings

Definitions

  • a reactor for partially oxidizing molten lead with air to produce lead oxide with a high free-lead content includes a chamber, a variable speed rotatable stirrer positioned in the chamber, an air inlet venturi extending into the chamber and inclined from the vertical in the direction of rotation of the stirrer, a spout for introducing molten lead into the chamber, a deflector mounted upstream of the spout with respect to the direction of rotation of the stirrer, an exhaust duct for the lead oxide extending into the chamber, being substantially aligned with the vertical axis of the chamber and having adjustable holes communicating with the atmosphere, means for cooling the chamber and means for creating a sub-atmospheric pressure in the chamber.
  • one object of the present invention is to provide for a reactor of the above-mentioned type which improves the contact between the molten lead and the air which transforms the metal into lead oxide.
  • Another object is to obtain a faster and less expensive starting of such reactors.
  • a further object is to provide for a reactor for producing litharge which allows an easy control of the quality of the obtained product and, notably, the production of litharge with a high proportion of free lead, i.e., litharge with to 35 weight-% free lead, this composition remaining constant.
  • the reactor which comprises in combination a circular chamber, a rotating stirrer in this chamber, means for rotating said stirrer which are located under said stirrer means for adjusting the rotation speed of said stirrer, a liquid lead inlet spout, an air inlet venturi protruding into the chamber and inclined from the vertical in the direction of the rotation of the stirrer, a double shelf or jacket arranged around the chamber and provided with means for circulating in it cooling air in order to evacu ate from the chamber a fraction of the heat produced by the oxidation of the lead, and an exhaust duct for evacuating from the chamber the produced oxide.
  • the stirrer is rotated by a shaft which passes through the lower part of the reactor and the duct for evacuating the produced oxide can consequently be placed following the axis of the reactor.
  • the starting of the installation is advantageously carried out, not by externally heating the reaction chamber, but by means of burners located in the air inlet venturi, which shortens substantially the duration of the starting.
  • Feeding the reactor with molten lead is preferably carried out by means of a constant-flow pump which works intermittently.
  • the exhaust duct for evacuating the produced litharge may be provided with adjustable openings which control the quantity of air flowing through the inlet venturi.
  • the installation according to the invention may also comprise, on the one hand, a deflector mounted upstream of the liquid lead inlet spout in the rotation direction of the stirrer its function will be precised below and, on the other hand, means for cooling the bearing in which said stirrer is mounted.
  • FIG. 1 is a schematical view of the reactor in a vertical cross-section.
  • FIG. 2 shows the object of FIG. 1 in a partially cut horizontal cross-section.
  • the reactor according to the invention comprises a cylindrical chamber 1, the bottom 2 of which is conically shaped and upwards flared.
  • a stirrer 3 is provided for instance with three arms 4a, 4b and 4c and presents the same shape as bottom 2 without contacting it.
  • This stirrer 3 is rotatably mounted around an axis extending downwardly and shown schematically at 5.
  • the stirrer 3 is rotated in the direction of arrow 6 by a device not shown of any classical type. It will be readily understood that this disposition leads for the product to be treated to the superposition of a radial movement on the circular stirring induced by the stirrer 3 during its rotation.
  • the rotation speed of the stirrer is adjustable, which allows to control the intensity of the stirring and consequently, the oxidation rate of the lead.
  • the cover 7 of chamber 1 is also conical, but downwardly flared. Through this cover passes an air inlet venturi 8, the geometrical axis 9 of which is, according to the invention, inclined from the vertical in the direction of the rotation of stirrer 3. More precisely, and in the case of the device shown on the drawings, the angle of this axis 9 with the vertical is about 40 and its horizontal projection is tangent to a circle with its center on the axis of chamber l and a radius equal to about 0,4 times the radius of this chamber. If one supposes it is oriented downwards, it is directed like arrow 6.
  • venturi 8 is arranged for removably placing into it burners which are shown very schematically at 10, for purposes given below.
  • the molten lead to transform partially into litharge is introduced into chamber 1 by means of a spout l1 fed by a pump (not shown).
  • the starting and stopping of this pump are controlled by a timer which is previously adjusted depending on the production of the apparatus and on the quality of the oxide to be produced.
  • a deflector 12 is mounted in chamber 1 upstream of spout 11 with respect to the rotation direction of stirrer 3. It consists in a cylindrical vertical metal sheet with one vertical edge fixed along a generatrix 13 of the lateral wall of chamber 1 and it extends inwardly till about 2/3 of the radius from the center. The function of this member is mainly to avoid a solidification of the lead stream and an escape of air and dust through the inlet spout for liquid lead. Pyrometrical rods are mounted between deflector 12 and spout 11.
  • the litharge is produced by reaction of the air introduced through venturi 8 with the lead entering into the reactor through spout 11.
  • This oxide is evacuated through an axial pipe 15 passing through cover 7 of chamber 1.
  • this pipe 15 is connected to an exhaust fan (not shown) which maintains a subatmospheric pressure in the inside of the chamber.
  • this pipe is provided with adjustable holes 16 which allow, by a by-pass effect, the control of the quantity of air flowing into venturi 8.
  • an axial pipe 17 passes through pipe 15 for purposes given below. At its upper end, this pipe is connected to a horizontal pipe which passes through pipe 15 and opens in the external atmosphere.
  • the chamber 1 itself is mounted in a jacket 18 provided with an inlet 19 and an outlet 20 for cooling air.
  • this cooling air while circulating in the space 21 between chamber 1 and jacket 18 evacuates a fraction'of the heat released by the reactron.
  • a cone 22 passes through the lower part of jacket 18. This cone supports the bearing (not shown) in which the shaft of stirrer 3 rotates. This bearing is cooled by air pulsed into cone 22 by means of a fan (not shown) and, at its upper end, by means of the pressure drop in chamber 1. (see below).
  • This device is operated as follows: the installation is first preheated by means of burners l0 removably mounted in the air admission venturi 8. This preheating takes place till a temperature is reached which is at least equal to the smelting point of lead. Molten lead is then introduced into chamber 1 through spout l1 and the metal is oxidised by air with a strong release of heat which increases the temperature in the chamber. As soon as an optimum value is reached, it is maintained constant by adjusting the holes 16 which control the flow of air through venturi 8 and/or by adjusting the flow of cooling air through the space 21 provided between chamber 1 and jacket 18.
  • the proportion of free lead in the produced oxide is obviously a function of the rotation speed of stirrer 3, of the lead feed-rate into the apparatus and of the temperature within chamber 1.
  • a reactor for partially oxidizing molten lead with air to produce lead oxide with a high free-lead content comprising in combination a cylindrical chamber, a rotatable stirrer positioned in said chamber, means for rotating said stirrer at a variable speed, said rotating means being located under said stirrer, an air inlet venturi extending into said chamber and inclined from the vertical in the direction of rotation of said stirrer, a spout for introducing molten lead into said chamber ex tending into said chamber and connected with a pump fed with molten lead, a deflector mounted upstream of said spout with respect to the direction of rotation of said stirrer, an exhaust duct for said lead oxide extending into said chamber, said exhaust duct being substantially aligned with the vertical axis of said chamber, and having adjustable holes communicating with the atmosphere, means for cooling said chamber, and means for creating a subatmospheric pressure in said chamber.
  • said means for cooling the upper end of said bearing comprises a vertical tube coaxial with said exhaust duct and located within said duct, said vertical tube communieating with the atmosphere.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Oxygen, Ozone, And Oxides In General (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

A reactor for partially oxidizing molten lead with air to produce lead oxide with a high free-lead content includes a chamber, a variable speed rotatable stirrer positioned in the chamber, an air inlet venturi extending into the chamber and inclined from the vertical in the direction of rotation of the stirrer, a spout for introducing molten lead into the chamber, a deflector mounted upstream of the spout with respect to the direction of rotation of the stirrer, an exhaust duct for the lead oxide extending into the chamber, being substantially aligned with the vertical axis of the chamber and having adjustable holes communicating with the atmosphere, means for cooling the chamber and means for creating a sub-atmospheric pressure in the chamber.

Description

llnite States Patet [1 1 lLeslbros et al.
[ Sept. 17, 1974 [75] Inventors: Andre Jose Lesbros; Max Jacques Raoul Brachet, both of Rieux, France [73] Assignee: Societe Miniere Et Metallurgique De Penarroya, Paris, France [22] Filed: June 7, 1972 [21] Appl. No.: 260,456
[30] Foreign Application Priority Data June 10,1971 France 71.21066 [56] References Cited UNITED STATES PATENTS Grapp 432/233 Hull et al. 432/233 Vahrenkamp et al. 136/27 Primary ExaminerJames H. Tayman, Jr. Attorney, Agent, or Firm-Fleit, Gipple & Jacobson [5 7 ABSTRACT A reactor for partially oxidizing molten lead with air to produce lead oxide with a high free-lead content includes a chamber, a variable speed rotatable stirrer positioned in the chamber, an air inlet venturi extending into the chamber and inclined from the vertical in the direction of rotation of the stirrer, a spout for introducing molten lead into the chamber, a deflector mounted upstream of the spout with respect to the direction of rotation of the stirrer, an exhaust duct for the lead oxide extending into the chamber, being substantially aligned with the vertical axis of the chamber and having adjustable holes communicating with the atmosphere, means for cooling the chamber and means for creating a sub-atmospheric pressure in the chamber.
6 Claims, 2 Drawing Figures REACTOR FOR THE PRODUCTION OF LEAD OXIDE WITH A HIGH FREE-LEAD CONTENT It is well-known that litharge with a high free lead content is generally produced by partial oxidation of liquid lead by the oxygen contained in the air. This oxidation takes place in a reactor which comprises means for introducing air and molten lead into it, together with a rotating stirrer which improves the contact between the metal and the oxidizing agent. Such known reactors comprise furthermore a heating chamber for initiating the reaction. An example of these reactors is the so-called Barton pot" is described for instance in the French Pat. No. 400,270.
These known devices are subjected to various drawbacks among which that it takes a long time to start the reactor, the difficulties which are met when a control of the quality of the obtained product is wished, i.e., among others a control of its free lead content and of its granulometry, the frequent cleaning operations and the unsatisfactying yield.
Consequently, one object of the present invention is to provide for a reactor of the above-mentioned type which improves the contact between the molten lead and the air which transforms the metal into lead oxide.
Another object is to obtain a faster and less expensive starting of such reactors.
A further object is to provide for a reactor for producing litharge which allows an easy control of the quality of the obtained product and, notably, the production of litharge with a high proportion of free lead, i.e., litharge with to 35 weight-% free lead, this composition remaining constant.
These objects and others which will appear further below are reached by the reactor according to the invention which comprises in combination a circular chamber, a rotating stirrer in this chamber, means for rotating said stirrer which are located under said stirrer means for adjusting the rotation speed of said stirrer, a liquid lead inlet spout, an air inlet venturi protruding into the chamber and inclined from the vertical in the direction of the rotation of the stirrer, a double shelf or jacket arranged around the chamber and provided with means for circulating in it cooling air in order to evacu ate from the chamber a fraction of the heat produced by the oxidation of the lead, and an exhaust duct for evacuating from the chamber the produced oxide.
The stirrer is rotated by a shaft which passes through the lower part of the reactor and the duct for evacuating the produced oxide can consequently be placed following the axis of the reactor.
These dispositions, on the one hand, improve the contact of the molten lead with the air and, on the other hand, allow the device to operate like a cyclone which provides for the size classification of the produced lead oxide.
The starting of the installation is advantageously carried out, not by externally heating the reaction chamber, but by means of burners located in the air inlet venturi, which shortens substantially the duration of the starting.
Feeding the reactor with molten lead is preferably carried out by means of a constant-flow pump which works intermittently. Furthermore, the exhaust duct for evacuating the produced litharge may be provided with adjustable openings which control the quantity of air flowing through the inlet venturi.
The installation according to the invention may also comprise, on the one hand, a deflector mounted upstream of the liquid lead inlet spout in the rotation direction of the stirrer its function will be precised below and, on the other hand, means for cooling the bearing in which said stirrer is mounted.
The following description has no limitative character and will allow those skilled in the art to readily understand how the present invention can be carried out. It must be read with reference to the accompanying drawings among which:
FIG. 1 is a schematical view of the reactor in a vertical cross-section.
FIG. 2 shows the object of FIG. 1 in a partially cut horizontal cross-section.
The reactor according to the invention comprises a cylindrical chamber 1, the bottom 2 of which is conically shaped and upwards flared. A stirrer 3 is provided for instance with three arms 4a, 4b and 4c and presents the same shape as bottom 2 without contacting it. This stirrer 3 is rotatably mounted around an axis extending downwardly and shown schematically at 5. The stirrer 3 is rotated in the direction of arrow 6 by a device not shown of any classical type. It will be readily understood that this disposition leads for the product to be treated to the superposition of a radial movement on the circular stirring induced by the stirrer 3 during its rotation. The rotation speed of the stirrer is adjustable, which allows to control the intensity of the stirring and consequently, the oxidation rate of the lead.
The cover 7 of chamber 1 is also conical, but downwardly flared. Through this cover passes an air inlet venturi 8, the geometrical axis 9 of which is, according to the invention, inclined from the vertical in the direction of the rotation of stirrer 3. More precisely, and in the case of the device shown on the drawings, the angle of this axis 9 with the vertical is about 40 and its horizontal projection is tangent to a circle with its center on the axis of chamber l and a radius equal to about 0,4 times the radius of this chamber. If one supposes it is oriented downwards, it is directed like arrow 6.
It will be easily understood that "the above-cited numerical values are a function of the dimensions of the reactor and, more specifically, of its height/diameter ratio. Those skilled in the art will determine readily these numerical values in each particular case encountered, being given that the introduced air must be given a downwardly curling movement, in order to allow the apparatus to operate like a cyclone. This disposition permits, in fact, a mechanical sorting of the particles into sizes, as will be shown below.
Furthermore, the venturi 8 is arranged for removably placing into it burners which are shown very schematically at 10, for purposes given below.
The molten lead to transform partially into litharge is introduced into chamber 1 by means of a spout l1 fed by a pump (not shown). The starting and stopping of this pump are controlled by a timer which is previously adjusted depending on the production of the apparatus and on the quality of the oxide to be produced.
A deflector 12 is mounted in chamber 1 upstream of spout 11 with respect to the rotation direction of stirrer 3. It consists in a cylindrical vertical metal sheet with one vertical edge fixed along a generatrix 13 of the lateral wall of chamber 1 and it extends inwardly till about 2/3 of the radius from the center. The function of this member is mainly to avoid a solidification of the lead stream and an escape of air and dust through the inlet spout for liquid lead. Pyrometrical rods are mounted between deflector 12 and spout 11.
The litharge is produced by reaction of the air introduced through venturi 8 with the lead entering into the reactor through spout 11. This oxide is evacuated through an axial pipe 15 passing through cover 7 of chamber 1. In fact, this pipe 15 is connected to an exhaust fan (not shown) which maintains a subatmospheric pressure in the inside of the chamber. Furthermore, this pipe is provided with adjustable holes 16 which allow, by a by-pass effect, the control of the quantity of air flowing into venturi 8.
On the other hand, an axial pipe 17 passes through pipe 15 for purposes given below. At its upper end, this pipe is connected to a horizontal pipe which passes through pipe 15 and opens in the external atmosphere.
The chamber 1 itself is mounted in a jacket 18 provided with an inlet 19 and an outlet 20 for cooling air. in fact, it is well-known that the oxidation of lead is strongly exothermic, and this cooling air, while circulating in the space 21 between chamber 1 and jacket 18 evacuates a fraction'of the heat released by the reactron.
Lastly, a cone 22 passes through the lower part of jacket 18. This cone supports the bearing (not shown) in which the shaft of stirrer 3 rotates. This bearing is cooled by air pulsed into cone 22 by means of a fan (not shown) and, at its upper end, by means of the pressure drop in chamber 1. (see below).
This device is operated as follows: the installation is first preheated by means of burners l0 removably mounted in the air admission venturi 8. This preheating takes place till a temperature is reached which is at least equal to the smelting point of lead. Molten lead is then introduced into chamber 1 through spout l1 and the metal is oxidised by air with a strong release of heat which increases the temperature in the chamber. As soon as an optimum value is reached, it is maintained constant by adjusting the holes 16 which control the flow of air through venturi 8 and/or by adjusting the flow of cooling air through the space 21 provided between chamber 1 and jacket 18. Due to the fact that the reactor works like a cyclone, as mentioned before, the particles which are fine enough escape through pipe 15, and the other ones come into contact with the wall of the chamber and fall towards the bottom 2 where they are worked again by agitator 3. At the outlet of the pipe 15, fine lead oxide with a very homogeneous granulometry is obtained.
The air flowing through pipe 17 due to the subatmospheric pressure in chamber 1 cools the bearing in which the shaft of stirrer 3 is mounted.
The proportion of free lead in the produced oxide is obviously a function of the rotation speed of stirrer 3, of the lead feed-rate into the apparatus and of the temperature within chamber 1. By means of several preliminary tests, those skilled in the art will readily determine the values to be chosen for these parameters in each particular case.
What I claim is:
1. A reactor for partially oxidizing molten lead with air to produce lead oxide with a high free-lead content, comprising in combination a cylindrical chamber, a rotatable stirrer positioned in said chamber, means for rotating said stirrer at a variable speed, said rotating means being located under said stirrer, an air inlet venturi extending into said chamber and inclined from the vertical in the direction of rotation of said stirrer, a spout for introducing molten lead into said chamber ex tending into said chamber and connected with a pump fed with molten lead, a deflector mounted upstream of said spout with respect to the direction of rotation of said stirrer, an exhaust duct for said lead oxide extending into said chamber, said exhaust duct being substantially aligned with the vertical axis of said chamber, and having adjustable holes communicating with the atmosphere, means for cooling said chamber, and means for creating a subatmospheric pressure in said chamber.
2. The reactor according to claim 1, wherein said stirrer has three arms.
3. The reactor according to claim 1, and further comprising burners removably mounted on said air inlet venturi for heating the air.
4. The reactor according to claim 1, wherein said stirrer is mounted in a bearing which is in contact with the atmosphere at its lower end and wherein said reactor further comprises means for cooling the upper end of said bearing.
5. The reactor as claimed in claim 4, wherein said means for cooling the upper end of said bearing comprises a vertical tube coaxial with said exhaust duct and located within said duct, said vertical tube communieating with the atmosphere.
6. The reactor as claimed in claim 1, wherein said means for creating a sub-atmospheric pressure comprises a suction fan connected to said exhaust duct.

Claims (5)

  1. 2. The reactor according to claim 1, wherein said stirrer has three arms.
  2. 3. The reactor according to claim 1, and further comprising burners removably mounted on said air inlet venturi for heating the air.
  3. 4. The reactor according to claim 1, wherein said stirrer is mounted in a bearing which is in contact with the atmosphere at its lower end and wherein said reactor further comprises means for cooling the upper end of said bearing.
  4. 5. The reactor as claimed in claim 4, wherein said means for cooling the upper end of said bearing comprises a vertical tube coaxial with said exhaust duct and located within said duct, said vertical tube communicating with the atmosphere.
  5. 6. The reactor as claimed in claim 1, wherein said means for creating a sub-atmospheric pressure comprises a suction fan connected to said exhaust duct.
US00260456A 1971-06-10 1972-06-07 Reactor for the production of lead oxide with a high free-lead content Expired - Lifetime US3836339A (en)

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BE (1) BE784417A (en)
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CA (1) CA965585A (en)
ES (1) ES403738A1 (en)
FR (1) FR2140861A5 (en)
GB (1) GB1364391A (en)
IL (1) IL39638A (en)
IT (1) IT960098B (en)
NL (1) NL152823B (en)
NO (1) NO131722C (en)
OA (1) OA04035A (en)
SE (1) SE392261B (en)
YU (1) YU35676B (en)
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5482689A (en) * 1989-07-10 1996-01-09 Heubach & Lindgens Gmbh & Co. Kg. Process for the accelerated production of red lead oxide
US5651952A (en) * 1993-10-11 1997-07-29 Pasminco Australia Limited Process for the production of litharge (PbO)
WO2014153570A3 (en) * 2013-03-15 2015-02-19 Transtar Group, Ltd New and improved system for processing various chemicals and materials
CN104941558A (en) * 2015-06-18 2015-09-30 天津大学 Jet flow flash condensation pot for continuous preparation of hydrogenated nitrile rubber

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3016984C2 (en) * 1980-05-02 1984-03-29 Goslarer Farbenwerke Dr. Hans Heubach GmbH & Co KG, 3394 Langelsheim Process and device for the one-step production of technical lead oxide

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2276614A (en) * 1941-03-13 1942-03-17 Herbert L Grapp Cooling device
US3094273A (en) * 1959-06-25 1963-06-18 Ametek Inc Fan assembly
US3322496A (en) * 1965-05-10 1967-05-30 Nat Lead Co Process for producing lead oxides

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2276614A (en) * 1941-03-13 1942-03-17 Herbert L Grapp Cooling device
US3094273A (en) * 1959-06-25 1963-06-18 Ametek Inc Fan assembly
US3322496A (en) * 1965-05-10 1967-05-30 Nat Lead Co Process for producing lead oxides

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5482689A (en) * 1989-07-10 1996-01-09 Heubach & Lindgens Gmbh & Co. Kg. Process for the accelerated production of red lead oxide
US5651952A (en) * 1993-10-11 1997-07-29 Pasminco Australia Limited Process for the production of litharge (PbO)
WO2014153570A3 (en) * 2013-03-15 2015-02-19 Transtar Group, Ltd New and improved system for processing various chemicals and materials
CN104941558A (en) * 2015-06-18 2015-09-30 天津大学 Jet flow flash condensation pot for continuous preparation of hydrogenated nitrile rubber
CN104941558B (en) * 2015-06-18 2017-03-29 天津大学 A kind of continous way prepares the jet flash distillation condensing field of hydrogenated nitrile-butadiene rubber

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BR7203716D0 (en) 1973-06-12
SE392261B (en) 1977-03-21
BE784417A (en) 1972-10-02
FR2140861A5 (en) 1973-01-19
IT960098B (en) 1973-11-20
ES403738A1 (en) 1975-05-16
GB1364391A (en) 1974-08-21
CA965585A (en) 1975-04-08
JPS55151838U (en) 1980-11-01
NL152823B (en) 1977-04-15
OA04035A (en) 1979-09-30
NO131722B (en) 1975-04-07
ZA723980B (en) 1973-03-28
NL7207806A (en) 1972-12-12
IL39638A (en) 1975-06-25
DE2228201B2 (en) 1976-01-15
DE2228201A1 (en) 1973-01-04
NO131722C (en) 1975-07-16
IL39638A0 (en) 1972-08-30
ZM9772A1 (en) 1973-02-21
YU35676B (en) 1981-04-30
YU149572A (en) 1980-09-25

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