EP3579958A1 - Procédé de prévention et d'extinction de toute déflagration dans le cas de matières aptes à la déflagration - Google Patents

Procédé de prévention et d'extinction de toute déflagration dans le cas de matières aptes à la déflagration

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Publication number
EP3579958A1
EP3579958A1 EP18704501.8A EP18704501A EP3579958A1 EP 3579958 A1 EP3579958 A1 EP 3579958A1 EP 18704501 A EP18704501 A EP 18704501A EP 3579958 A1 EP3579958 A1 EP 3579958A1
Authority
EP
European Patent Office
Prior art keywords
deflagration
pressure
detected
processing
compounds
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18704501.8A
Other languages
German (de)
English (en)
Inventor
Heinrich Morhenn
Uwe Pohl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayer AG
Original Assignee
Bayer AG
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 Bayer AG filed Critical Bayer AG
Publication of EP3579958A1 publication Critical patent/EP3579958A1/fr
Withdrawn legal-status Critical Current

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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
    • B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
    • B01J3/006—Processes utilising sub-atmospheric pressure; Apparatus therefor
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C37/00—Control of fire-fighting equipment
    • A62C37/36—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
    • A62D1/00—Fire-extinguishing compositions; Use of chemical substances in extinguishing fires
    • A62D1/0028—Liquid extinguishing substances
    • A62D1/0035—Aqueous solutions
    • A62D1/0042—"Wet" water, i.e. containing surfactant
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
    • A62C3/002—Fire prevention, containment or extinguishing specially adapted for particular objects or places for warehouses, storage areas or other installations for storing goods
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
    • A62C3/04—Fire prevention, containment or extinguishing specially adapted for particular objects or places for dust or loosely-baled or loosely-piled materials, e.g. in silos, in chimneys
    • 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
    • B01J2219/00259—Preventing runaway of the chemical reaction
    • B01J2219/00263—Preventing explosion of the chemical mixture
    • 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
    • B01J2219/00259—Preventing runaway of the chemical reaction
    • B01J2219/00265—Preventing flame propagation

Definitions

  • the invention relates to a method for processing and / or handling of deflagratable solids and / or mixtures, in particular for processing deflagrationtransporter substances in the chemical and pharmaceutical industries, wherein the processing and handling in an environment under reduced pressure and the cancellation of the reduced pressure only then takes place when deflagration can be ruled out on the basis of certain parameters, and measures are taken to delete the deflagration if deflagration is not ruled out.
  • the technical rule for plant safety (TRAS) No. 410 defines a deflagration as follows: "A deflagration is a reaction that can be triggered locally at a given amount of substance and from there propagates independently through the entire amount of substance in the form of a reaction front. The propagation velocity of the reaction front is lower than the speed of sound in the substance. Deflagration can release large amounts of hot gases that may also be flammable. The deflagration velocity increases with the temperature and, as a rule, also with the pressure ".
  • Deflagratable solids decompose after local action of a sufficiently strong ignition source (initiation) even without the presence of atmospheric oxygen. In contrast to a fire or an explosion of an air / gas or air / dust mixture, deflagration can not be prevented by excluding oxygen.
  • the known from the explosion protection measure of inerting with nitrogen or other inert gases offers no protection against deflagration.
  • Explosions are fast deflagrations with sudden increases in pressure and temperature. When the speed of sound is exceeded, a deflagration becomes a detonation.
  • the substances capable of deflagration are mostly organic or inorganic compounds in solid form.
  • organic compounds having functional groups such as carbon-carbon double and triple bonds such as acetylenes, acetylides, 1,2-dienes tend to deflagrate; strained ring compounds such as azirines or epoxides; Compounds with adjacent N atoms such as azo and diazo compounds, hydrazines, azides; Compounds with contiguous O atoms such as peroxides and ozonides; Oxygen-nitrogen compounds such as hydroxylamines, nitrates, N-oxides, 1,2 oxalates, nitro and nitroso compounds; Halogen-nitrogen compounds such as chloroamines and Fluoro amines; Halogen-oxygen compounds such as chlorates, perchlorates,
  • test C.I The deflagration ability is assessed in test C.I as follows:
  • fast deflagration capable if the pressure within the pressure vessel after ignition in less than 30 seconds from 6.90 barü to 20.70 barü increases.
  • test C.2 a sample is filled into a Dewar vessel about 48 mm in inner diameter and 180-200 mm high. The mixture is ignited with an open flame. The deflagration ability is assessed in test C.2 as follows:
  • fast deflagration capable if the deflagration velocity is greater than 5 mm sec.
  • VDI2263-1 Another test for determining the deflagration capacity is described in VDI2263-1 (1990, p 13 ff.).
  • a substance is filled into a glass tube, closed at the bottom, with a diameter of approx. 5 cm, in which several thermocouples are mounted radially offset at different heights.
  • ignition by an incandescent filament, a glow plug, a microburner or an ignition mixture of lead (IV) oxide and silicon
  • the progress of the decomposition is determined. The initiation takes place from above and from the bottom of the bed. If the decomposition proceeds in at least one of the experiments (ignition from above and ignition from below), then the substance is considered capable of deflagration.
  • sources of ignition alternatively filament, glow plug, micro burner or ignition mixture (silicon / lead oxide in the ratio 3: 2) are used.
  • the duration of action and the energy input of the ignition sources are not further defined.
  • the standard version according to VDI2263-1 measures the deflagration behavior at ambient temperature and pressure. It can also be measured at elevated temperature and in a closed vessel.
  • deflagration-capable solids are carried out with the usual process steps known from organic and inorganic chemistry. Usually, starting materials in liquid form or in the form of solutions are reacted with each other, the desired substance usually precipitates out as a solid. This is then separated from the remaining liquid components, and is available after any further purification steps, drying and intermediate storage in the desired form for filling and transport to the customer. Optionally, the desired substance is further processed and, for example, ground and / or mixed with other components.
  • deflagratable solids on a laboratory scale is usually unproblematic.
  • the amounts handled are small, the likelihood of initiation of deflagration is low, any deflagration that occurs is quickly detected, and even if deflagration is not detected and progressed, the extent of damage is small.
  • the problem is the production of deflagration-capable substances in larger quantities as it takes place in a pilot plant or in a production plant.
  • a number of apparatuses are used, which on the one hand have potential sources of initiation, and on the other hand, due to the quantities handled, a deflagration detected too late or too late can lead to great damage.
  • Apparatuses in technical and production plants are often equipped with mechanical devices which serve for transport, mixing, renewal of the surface or other purposes.
  • mixers with moving mechanical elements such as plowshare mixers or screw mixers are used for the homogenization of solids.
  • the mechanical devices are one of the most frequent causes for the initiation of deflagration.
  • a moving mixing element can come into direct contact with the apparatus jacket, local heating takes place at the friction location, which causes the surrounding substance to decompose and thus initiate deflagration.
  • a foreign body for example a screw
  • a foreign body had entered an apparatus where it passed between the wall and the mixing / mixing element and caused by the heating a deflagration. Even by rubbing hard crusts or by friction in a clogged conveyor screw, deflagration has been triggered.
  • deflagration can be transferred from one apparatus to another.
  • an introduced screw in a mixer an introduced screw can be heated by friction in the manner described.
  • the hot screw is then discharged, for example, in a silo without mechanical installations.
  • the temperature of the screw can still be sufficiently high to cause the surrounding substance in the silo to decompose and thus trigger a deflagration.
  • agglomerates in which a deflagrative decomposition has already been initiated can be discharged into an apparatus without mechanical installations and there initiate the deflagrative decomposition of the apparatus contents.
  • One common way to avoid deflagration is to carefully avoid the entry of foreign bodies. This can be done for example by a metal deposition, which takes place before the entry into the apparatus and prevents entrainment of screws and other metallic foreign bodies in the processing step.
  • Another known method for the safe processing of substances capable of deflagration is to recognize the beginning of a deflagration in time and to prevent the onset of deflagration by dissipating the energy. Detection can be done through a number of indicators. For example, the monitoring of temperature and / or pressure are known. When the tripping value is reached, the energy is removed from the system. In general, this is done by adding a larger amount of water. Due to the heat capacity of the water, the deflagration substance cools to temperatures below the decomposition temperature. Additional heat dissipation can be achieved by the formation of water vapor. A detergent may be added to the water to ensure good wetting of the deflagrating substance. The through the supply and evaporation water-induced increase in volume must be derived by suitable means to counteract undesirable pressure build-up.
  • WO 2014/139876 AI Another method for processing and handling deflagrationsLiteer substances is described in WO 2014/139876 AI.
  • WO 2014/139876 A1 describes a method in which the processing and / or handling of the deflagratable solids in an environment under reduced pressure.
  • WO 2014/139876 A1 describes, inter alia, the processing and handling of deflagratable solids in common chemical process steps, in particular filtration, drying, grinding, sieving, mixing, homogenizing, granulating, compacting, filling, storage and transport in a transport container, and mechanical transport such eg the promotion in augers or by rotary valves.
  • WO 2014/139876 A1 for the processing and handling of solids capable of deflagration in apparatuses with mechanical installations is particularly advantageous. Whereas WO 2014/139876 A1 describes in detail the processing of substances capable of deflagration under reduced pressure, WO 2014/139876 A1 gives no indications as to how the substances capable of deflagration are safely returned to ambient pressure after completion of the respective process step or at the end of the manufacturing or handling process can.
  • EP17154912.4 a method for the processing and / or handling of deflagration-capable substances under reduced pressure is described in which the cancellation of the reduced pressure takes place only when an ignition source is switched off and between switching off the potential ignition source and canceling the reduced pressure a waiting period is respected. The waiting time is specified as 10 to 60 minutes.
  • the object of the present invention was therefore to find a method for the processing and / or handling of deflagration-capable solids in an environment under reduced pressure, which has safe measures for the detection and deletion of the deflagration at an onset of deflagration.
  • the object is achieved by a method in which during the processing and handling of a deflagration-capable substance under reduced pressure measures for the detection of a Deflagration be taken and taken on detection of deflagration measures to extinguish the deflagration.
  • mbara absolute pressure in millibars
  • the presence of a possible deflagration can be determined after switching off the drive of the mechanical internals, or even with continuing running drive.
  • one or more parameters are used according to the invention, which indicate an incipient decomposition or deflagration.
  • Such parameters are an increase in pressure, temperature, the appearance of decomposition products, or other characteristics measurable as a result of deflagration, as well as a combination of several features.
  • the maintenance or restoration of the negative pressure is preferred.
  • Another measure to complete the deflagration is the addition of an extinguishing agent in the apparatus under negative pressure, wherein the extinguishing agent is preferably water or surfactant-added water and the pressure in the apparatus at the beginning of the extinguishing agent addition according to the invention ⁇ 700 mbara is.
  • the extinguishing agent addition can be triggered by the plant operator by hand. However, the addition of extinguishing agent can also be triggered automatically for the given limit values in each case.
  • An indication of incipient deflagration is the increase in pressure in the apparatus. If the pressure increases with an effective negative pressure source, this is an indication of incipient deflagration.
  • the drive of the mechanical internals can be turned off while maintaining the connection to the vacuum source. Unless self-sustained decomposition has formed, the decomposition under vacuum is extinguished.
  • Another possibility for quenching the deflagration is the addition of an extinguishing agent, preferably the supply of water or surfactant-added water to extinguish the deflagration.
  • the addition of the extinguishing agent can be automatically coupled, for example, to a certain limit value for the pressure, at which the quench is automatically triggered in the respective process step. The limit value must be determined according to the respective procedure.
  • the apparatus Before the reduced pressure is removed, the apparatus is usefully disconnected from the vacuum source. If you wait a while between disconnecting the negative pressure source and releasing the negative pressure and observe the pressure during this time, a pressure increase above the leakage rate of the apparatus is an indication of an incipient deflagration.
  • the leakage rate of the apparatus corresponds to the pressure increase, which can be observed due to various small leaks on the apparatus.
  • the leak rate can be determined before filling the apparatus with product by means of measures known to the person skilled in the art. According to the invention, when the pressure rises above the leak rate or when a thermal pressure build-up due to the introduction of energy occurs, there is no reversal of the reduced pressure. Instead, countermeasures are taken to curb incipient deflagration.
  • connection to the vacuum source is restored in order to restore the reduced pressure and to cause the deflagration to go out.
  • the onset of deflagration can also be extinguished by the addition of water, surfactant-added water or another substance.
  • the waiting time for the observation of the pressure after disconnecting the negative pressure source until the release of the negative pressure is preferably 5 minutes.
  • the waiting time for observing the pressure after disconnecting the vacuum source on the basis of the deflagration rate and the gas evolution resulting therefrom, as well as the apparatus size and the free volume in the apparatus, the material to be processed and optionally further parameters to 60 minutes, preferably 5 to 15 minutes. If the pressure increase during the waiting time corresponds to the leak rate, then the vacuum can be broken after the end of the waiting time.
  • the drive of the potential mechanical ignition source can be switched off in the process described in the previous section after disconnecting the vacuum source, or even be in operation.
  • the drive of the potential mechanical ignition source is switched off before or simultaneously disconnecting the vacuum source.
  • the potential mechanical ignition sources can remain in operation even after disconnecting the vacuum source. This may be required in some apparatuses, for example to prevent agglomeration of particles, or because the mechanical organ is to remain in motion for subsequent discharge of product.
  • the observation of the pressure and the said period of time between the separation of the vacuum source and the cancellation of the reduced pressure also provide protection against deflagration for the purposes of the present invention. As long as the apparatus is connected to the vacuum source, the vacuum source will suck off any resulting gases without increasing the pressure in the apparatus. In this way, the deflagration could continue to advance before being detected by a pressure increase.
  • decomposition gases In order to detect a deflagration in such a case in good time, in addition to the pressure, further criteria for the detection of decomposition gases can be used.
  • the increased accumulation of decomposition gases can be detected by operating parameters of the pump such as increased power consumption or increased torque.
  • the determination of the gas flow at the vacuum source can be used as a parameter for the presence of a deflagration, an increased gas flow would indicate a possible onset of deflagration.
  • limit values can be established which triggers an automatic triggering of the protective measure, preferably the supply of water or surfactant-added water.
  • incipient deflagration is the increase in temperature in the apparatus.
  • the temperature is preferably measured in the gas phase. However, it is also possible to measure the temperature in the solids bed. Any temperature increases due to external heating or energy input by the mixing device must be taken into account when setting limit values. As a result of the energy released during deflagration, the temperature rise caused by deflagration is generally> 50 ° C. If the temperature increases with an effective negative pressure source, this is an indication of incipient deflagration.
  • the drive of the mechanical internals can be turned off while maintaining the connection to the vacuum source. Unless self-sustained decomposition has formed, the decomposition under vacuum is extinguished.
  • Another way to quench the deflagration is the addition of an extinguishing agent, preferably the supply of water or surfactant-added water to quench the deflagration.
  • the addition of the extinguishing agent may be automatically coupled to some limit for the temperature at whose crossing in the respective process step the quenche is automatically triggered. The limit value must be determined according to the respective procedure.
  • the apparatus Before the reduced pressure is removed, the apparatus is usefully disconnected from the vacuum source. If you wait a while between disconnecting the negative pressure source and releasing the negative pressure and observing the temperature during this time, then a temperature rise is an indication of incipient deflagration.
  • the connection to the negative pressure source is restored in order to ensure the reduced pressure and to cause the deflagration to extinguish.
  • the onset of deflagration can also be extinguished by the addition of water, surfactant-added water or another substance.
  • the waiting time for observing the temperature after disconnecting the vacuum source until the reduction of the reduced pressure is preferably 5 minutes.
  • the leak rate, the degree of filling, the properties of the gas evolution rate other waiting times can be set.
  • the person skilled in the art will determine the waiting time for the observation of the temperature after separation of the vacuum source on the basis of the deflagration rate and the gas evolution resulting therefrom, as well as the size of the apparatus and the free volume in the apparatus, the substance to be processed and optionally further parameters.
  • the time period should be 5 to 60 minutes, preferably 5 to 15 minutes.
  • the vacuum can be broken without fear of deflagration.
  • the time interval between the separation of the vacuum source and the release of the reduced pressure is determined differently depending on the size and construction of the apparatus, the leak rate, the degree of filling, the properties of the material to be processed and optionally further parameters. According to the invention, the period of time is 5 to 60 minutes, preferably 10 to 20 minutes.
  • the drive of the potential mechanical ignition source can be switched off in the process described in the previous section after disconnecting the vacuum source, or even to be in operation.
  • the drive of the potential mechanical ignition source is switched off before or simultaneously with disconnection of the vacuum source.
  • the potential mechanical ignition sources can remain in operation even after disconnecting the vacuum source. This may be required in some apparatuses, for example to prevent agglomeration of particles, or because the mechanical organ is to remain in motion for subsequent discharge of product.
  • the observation of the temperature and the said period between disconnection of the vacuum source and cancellation of the reduced pressure also provide protection against deflagration in the context of the present invention.
  • decomposition gases Another sign of incipient deflagration is the appearance of decomposition gases.
  • the decomposition gases on the one hand cause an increase in pressure, the detection and use of which has already been described in the upper sections.
  • most of the decomposition gases can be detected by suitable sensors. It is particularly advantageous that the decomposition gases occur at the beginning of the decomposition, that is to say at a point in time at which the ignition source is just taking effect, and thus even before an independently propagating decomposition, that is to say a deflagration, begins.
  • an incipient deflagration can thus be detected much earlier than is the case by a pressure and / or temperature increase or an increased gas flow.
  • the decomposition gases produced during deflagration are generally readily detectable gases such as carbon monoxide, carbon dioxide, nitrogen oxides, sulfur oxides, hydrogen cyanide, cyanurates, and others.
  • the decomposition gases are to be determined for the substance to be processed and sensors must be installed accordingly.
  • the sensors can be installed in the apparatus or in the connected pipelines. An installation on the outlet side of the vacuum source is also possible, but in this case only a monitoring with effective vacuum source is possible. For monitoring after separation of the vacuum source sensors on the pressure side of the vacuum source are out of the question.
  • the sensors are sensors known to those skilled in the art, which are based on spectroscopic, electrochemical or other principles based measuring methods such as UV / VIS photometry, UV fluorescence analysis, IR spectroscopy, chemiluminescence analysis, AAS, electrochemical measuring cells, etc.
  • decomposition gases are detected with an effective negative pressure source, incipient decomposition is to be assumed.
  • a possible first countermeasure against emergence or Progression of the deflagration is the switching off of the drives of the potential mechanical ignition sources while maintaining the reduced pressure. If no decomposition gases are detected after a reasonable time, it can be assumed that there is no deflagration or the incipient decomposition is extinguished. The reduced pressure is released. If necessary, processing can be continued. This must be decided on a case-by-case basis taking into account the respective circumstances.
  • deflagration can not be ruled out.
  • countermeasures to take As a countermeasure against the onset of deflagration, the addition of an extinguishing agent, preferably the addition of water or surfactant-added water to quench the deflagration takes place.
  • the addition of the extinguishing agent can be automatically coupled, for example, to a certain limit value for the decomposition gases, at which point the quencher is triggered automatically in the respective process step. The limit value must be determined according to the respective procedure.
  • decomposition gases are detected after separation of the negative pressure source, this can be an indication of incipient deflagration.
  • the connection to the vacuum source is restored in order to restore the reduced pressure and to cause the deflagration to go out.
  • the onset of deflagration can also be extinguished by the addition of water, surfactant-added water or another substance.
  • the negative pressure can be broken without fear of deflagration.
  • the period of time between disconnection of the vacuum source and release of the reduced pressure is determined differently depending on the size and construction of the apparatus, the leak rate, the degree of filling, the properties of the material to be processed and optionally further parameters. Due to the permanent monitoring already with effective vacuum source, the time span can be chosen very short. According to the invention, the period of time is 0.5 to 20 minutes, preferably 1 to 5 minutes.
  • the drive of the potential mechanical ignition source can be switched off in the process described in the previous section after disconnecting the vacuum source, or even be in operation.
  • the drive of the potential mechanical ignition source is switched off before or simultaneously with disconnection of the vacuum source.
  • the potential mechanical ignition source can remain in operation even after disconnecting the vacuum source. This may be required in some apparatuses, for example to prevent agglomeration of particles, or because the mechanical organ is to remain in motion for subsequent discharge of product.
  • the detection of possible decomposition gases and the said period of time between disconnection of the vacuum source and removal of the reduced pressure also provide protection against deflagration in the sense of the present invention.
  • a reduced pressure in the context of the present invention is a pressure range of ⁇ 500 mbara, more preferably a pressure range of ⁇ 100 mbara, particularly preferably in a pressure range of ⁇ 20 mbara.
  • the lower limit of the pressure range within the vessel> 2 mbara, preferably> 10 mbara is recommended.
  • the abolition of the reduced pressure is carried out with the conventional methods known in the art. Typically, first the connection to the vacuum source is disconnected. In the next step, gas is supplied via a suitable supply line and a valve located therein. Often, an inert gas such as nitrogen is added to possible oxidation reactions (which could result in both loss of quality and hazardous exothermic reactions). But it is also possible the supply of air or other gases.
  • the reduced pressure is raised up to the range of atmospheric pressure, whereby pressures above the atmospheric pressure can be adjusted. The removal of the reduced pressure should not be abrupt.
  • the duration and intensity of the gas supply is determined differently depending on the size and construction of the apparatus, the leak rate, the degree of filling, the properties of the substance to be processed and optionally further parameters.
  • the time for the release of the reduced pressure is in the range of one to 30 minutes.
  • a stepwise cancellation of the reduced pressure in which in a first stage to a certain pressure below atmospheric pressure is released and only in a further step either to atmospheric pressure or a further pressure level below the atmospheric pressure is relaxed.
  • waiting times can be set at the respective pressure levels, which in themselves also reduce the risk of deflagration.
  • the pressure level can also be on an area above the At atmospheric pressure, the atmospheric pressure is raised without setting the atmospheric pressure separately as an intermediate level during the transition from the pressure level below the atmospheric pressure to a pressure above the atmospheric pressure.
  • the process according to the invention is applicable to the processing and handling of deflagratable solid substances including explosive solid substances.
  • Typical deflagration-capable substances within the meaning of the present invention are organic compounds having functional groups such as carbon-carbon double and triple bonds such as acetylenes, acetylides, 1,2-dienes; strained ring compounds such as azirines or epoxides, compounds with adjacent N atoms such as azo and diazo compounds, hydrazines, azides, compounds having contiguous O atoms such as peroxides and ozonides, oxygen-nitrogen compounds such as hydroxylamines, nitrates, N-oxides, 1,2 oxalates, nitro and nitroso compounds; Halogen-nitrogen compounds such as chloroamines and fluoramines, halogen-oxygen compounds such as chlorates, perchlorates, iodosyl compounds; Sulfur-oxygen compounds such as sulphonyl halides, sulphonyl cyanides, and compounds with carbon-metal bonds and nitrogen-metal bonds such as Grignard rea
  • Deflagration-capable solids are deflagration-capable substances in solid form, wherein the substance is pure or mixed in solid form, for example as powder or granules in any grain size is present.
  • Deflagratable solids within the meaning of this invention also include deflagratable liquids, which are absorbed on non-deflagratable solids and thus present in solid form.
  • deflagratable solids likewise include substances capable of deflagration in solid form which still have residues of water or other liquids such as solvents (moist solids).
  • the grain size and the particle size distribution are known to influence the deflagration behavior, but the two parameters are not limiting for the present invention.
  • Processing and handling in the sense of this application are process and handling steps for the production, processing, storage and transport of deflagratable solids, in particular filtration, drying, grinding, sieving, mixing, homogenizing, granulating, compacting, filling, storing and transporting in a transport container , as well as mechanical transport such as the promotion in screw conveyors or by rotary valves.
  • the method is used for dry mechanical processing.
  • these process steps can be carried out either in or with the aid of apparatus in which the processed solid is moved by means of mechanical means, such as in a plowshare mixer, or in or by means of apparatuses without mechanical means, such as for example silos.
  • Reducing the pressure in the apparatus is accomplished by techniques known to those skilled in the art by means of vacuum pumps such as positive displacement pumps, jet pumps, rotary vane pumps, centrifugal pumps, water ring pumps, Roots pumps and other equipment suitable for generating the desired pressure.
  • vacuum pumps such as positive displacement pumps, jet pumps, rotary vane pumps, centrifugal pumps, water ring pumps, Roots pumps and other equipment suitable for generating the desired pressure.
  • the invention will be described below with reference to the mixture of 1,000 kg of dichlofluanid (Euparen) with 1,000 kg of kieselguhr in a vacuum operated paddle mixer.
  • the paddle dryer has a volume of 5 m3.
  • a vacuum of 50 mbar is set in the mixer via a vacuum pump with a capacity of 350 m3 / h.
  • the feed takes place via a vacuum lock with the stirrer shaft running.
  • the leak rate of the mixer was determined prior to charging at 50 l / h.
  • a pressure sensor and a temperature sensor are mounted in the gas space of the mixer. Through a valve, water can be added at a rate of 100 m3 / h to extinguish a deflagration.
  • the pressure in the mixer is brought to ambient pressure by adding nitrogen. (The addition of the inert gas nitrogen ensures that the product is not damaged by possible oxidation processes).
  • Dichlofluanid and the mixture with diatomaceous earth are capable of deflagration according to the test VDI2263-1.
  • the deflagration velocity determined according to VDI2263-1 is 2 mm / sec for ignition from below and 0.14 mm / sec for ignition from above. In the mixing process is due to a starting mixer blade before a potential ignition source
  • Example 1 Detection of incipient deflagration by pressure increase and termination of deflagration by further reduction of pressure
  • the apparatus After switching off the mixing device, the apparatus is separated from the vacuum source by closing the valve in the connection line to the vacuum pump, but no gas is supplied to release the vacuum. At the heated by tarnishing against the wall stirrer blade a deflagration is triggered, which propagates conically around the ignition. As a result of the gases released during the decomposition, the pressure increases. After 5 minutes, the pressure has risen to the alarm value of 70 mbar. The system operator restores the connection to the vacuum within one minute and the pressure is lowered to 50 mbar within 5 minutes. The pressure is maintained at 50 mbar for 30 minutes. Thereafter, the apparatus is again disconnected from the vacuum source by closing the valve in the connection line to the vacuum pump. No further pressure increase is observed over the next 15 minutes. The reduced pressure is removed by adding nitrogen, the dryer can be safely emptied.
  • Example 2 Detection of incipient deflagration by increasing the pressure and ending the deflagration by adding water
  • the apparatus After switching off the mixing device, the apparatus is separated from the vacuum source by closing the valve in the connection line to the vacuum pump, but no gas is supplied to release the vacuum.
  • a deflagration is triggered, which propagates conically around the ignition.
  • the pressure increases. After 5 minutes, the pressure has risen to the alarm value of 70 mbar.
  • the plant operator restores the connection to the vacuum after another 10 minutes, meanwhile the pressure has risen to 400 mbar.
  • the pressure is lowered within 8 minutes to 100 mbar and increases after another 20 minutes to 150 mbar.
  • the operator activates the water supply, 1,000 l of water are added and the mixer is switched on again.
  • the deflagration is stopped by the addition of water.
  • Example 3 Detection of incipient deflagration by raising the temperature and terminating the deflagration by further reducing the pressure.
  • the apparatus is disconnected from the vacuum source by closing the valve in the connection line to the vacuum pump, but no gas is released to relieve the vacuum.
  • a deflagration is triggered, which propagates conically around the ignition. Due to the released during the decomposition of hot gases, the temperature in the gas chamber increases. After 8 minutes, the temperature in the gas chamber rises to the alarm value of 40 ° C. The system operator restores the connection to the vacuum within one minute. The pressure is lowered to 50 mbar within 5 minutes. The temperature drops to ⁇ 30 ° C.
  • the pressure is maintained at 50 mbar for 30 minutes. Thereafter, the apparatus is again disconnected from the vacuum source by closing the valve in the connection line to the vacuum pump. No further temperature increase is observed over the next 30 minutes.
  • the reduced pressure is removed by adding nitrogen, the dryer can be safely emptied. The deflagration is extinguished in a vacuum.
  • Example 4 Detection of incipient deflagration by increasing the temperature and ending the deflagration by adding water
  • the apparatus is separated from the vacuum source by closing the valve in the connection line to the vacuum pump, but no gas is supplied to release the vacuum.
  • a deflagration is triggered, which propagates conically around the ignition. Due to the released during the decomposition of hot gases, the temperature in the gas chamber increases. After 10 minutes, the temperature in the gas chamber rises to the alarm value of 40 ° C. The temperature continues to rise and after a further 5 minutes reaches the switching value of 80 ° C, through which the water supply is triggered, there are added 1,000 1 of water, the mixing element is turned on again.
  • the deflagration is stopped by the addition of water.
  • Example 5 Detection of incipient deflagration by detection of the decomposition gases during operation and termination of the deflagration by switching off the mixer and maintaining the vacuum
  • Example 1-4 In addition to the apparatus described for Example 1-4 is on the pressure side of the
  • Vacuum pump installed an electrochemical sensor for the detection of S02.
  • the stirrer blade runs on one to the wall. By heating locally decomposes some Dichlofluanid.
  • the S02 content in the exhaust gas of the pump rises from 0 ppm (detection limit of the
  • the mixer is separated from the vacuum source, the reduced pressure is reduced by adding
  • Example 6 Detection of incipient deflagration by detection of the decomposition gases during operation and termination of the deflagration by addition of water
  • an electrochemical sensor for detecting SO 2 is installed on the pressure side of the vacuum pump.
  • the stirrer blade runs on one to the wall. By heating locally decomposes some Dichlofluanid.
  • the S02 content in the exhaust of the pump increases from 0 ppm (detection limit of the sensor) to 50 ppm.
  • the mixer is switched off.
  • the heated mixer blade causes a deflagration.
  • the SO2 content in the exhaust gas continues to increase. After 15 minutes it reaches a value of 200 ppm.
  • the operator activates the water supply. 1,000 l of water are added and the mixer is switched on again. The deflagration is stopped by the addition of water.
  • Example 7 Detection of incipient deflagration by detecting the decomposition gases and stopping the deflagration by further reducing the pressure
  • a UV luminescence cell for detecting SO 2 is installed on the dryer.
  • the apparatus After switching off the mixing device, the apparatus is separated from the vacuum source by closing the valve in the connection line to the vacuum pump, but no gas is supplied to release the vacuum. At the stirrer blade heated by starting against the wall, a deflagration is triggered, which spreads out in a cone-shaped manner around the ignition point.
  • the S02 content in the mixer increases from 0 mg / l / detection limit) to 0.5 mg / l.
  • the system operator restores the connection to the vacuum within one minute and the pressure is lowered to 50 mbar within 5 minutes.
  • the SO 2 content in the exhaust gas drops again after 10 minutes and reaches the detection limit again after 30 minutes.
  • the apparatus is again separated from the vacuum source by closing the valve in the connection line to the vacuum pump. Over the next 10 minutes, no further increase in S02 content is observed.
  • the reduced pressure is removed by adding nitrogen, the dryer can be safely emptied.
  • the deflagration is extinguished in a vacuum.
  • Example 8 Detection of incipient deflagration by detection of the decomposition gases and termination of deflagration by addition of water
  • a UV luminescence measuring cell for the detection of SO 2 is installed on the dryer.
  • the apparatus After switching off the mixing device, the apparatus is separated from the vacuum source by closing the valve in the connection line to the vacuum pump, but no gas is supplied to release the vacuum. At the stirrer blade heated by starting against the wall, a deflagration is triggered, which spreads out in a cone-shaped manner around the ignition point.
  • the S02 content in the mixer increases from 0 ppm / detection limit) to 10 mg / 1
  • the plant operator activates the water supply, 1,000 liters of water are added and the mixing element is switched on again.
  • the deflagration is stopped by the addition of water.

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  • Chemical & Material Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Degasification And Air Bubble Elimination (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Fire-Extinguishing Compositions (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

L'invention concerne un procédé de traitement et/ou de manipulation de matières solides et/ou de mélanges aptes à la déflagration, notamment de traitement de matières aptes à la déflagration dans l'industrie chimique et pharmaceutique, le traitement et/ou la manipulation se déroulant dans un environnement à pression réduite < 500 mbar et, en l'absence de prévention de déflagration, des mesures d'extinction de déflagration sont prises, le traitement et/ou la manipulation comprenant au moins une étape de procédé, sélectionnée dans le groupe suivant : filtration, broyage, tamisage, mélange, homogénéisation, granulation, compactage, remplissage, séchage, entreposage et transport dans un contenant de transport ainsi que d'autres étapes dans des appareils équipés d'inserts mécaniques.
EP18704501.8A 2017-02-07 2018-02-05 Procédé de prévention et d'extinction de toute déflagration dans le cas de matières aptes à la déflagration Withdrawn EP3579958A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP17154966.0A EP3357571A1 (fr) 2017-02-07 2017-02-07 Procédé pour prévenir et arreter une deflagration
PCT/EP2018/052795 WO2018146044A1 (fr) 2017-02-07 2018-02-05 Procédé de prévention et d'extinction de toute déflagration dans le cas de matières aptes à la déflagration

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EP3579958A1 true EP3579958A1 (fr) 2019-12-18

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EP18704501.8A Withdrawn EP3579958A1 (fr) 2017-02-07 2018-02-05 Procédé de prévention et d'extinction de toute déflagration dans le cas de matières aptes à la déflagration

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US (1) US20190351271A1 (fr)
EP (2) EP3357571A1 (fr)
JP (1) JP2020508724A (fr)
CN (1) CN110234423A (fr)
CA (1) CA3052521A1 (fr)
WO (1) WO2018146044A1 (fr)

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GB9416582D0 (en) * 1994-08-17 1994-10-19 Ici Plc Process for the production of exothermically reacting compositions
US7444761B2 (en) * 2006-03-06 2008-11-04 Gray Donald J Intrinsically safe flammable solvent processing method and system
FI123436B (fi) * 2007-11-27 2013-04-30 Maricap Oy Menetelmä ja laitteisto materiaalin alipainesiirtojärjestelmässä
DE102012008743A1 (de) * 2012-05-04 2013-11-07 Rembe Gmbh Safety + Control Verfahren zur Entdeckung und zur Beseitigung von Brand- und/oder Zündgefahren
CN103033606A (zh) * 2012-12-11 2013-04-10 常州大学 一种测定半敞开空间可燃气体最小点火能的方法
EP2777808A1 (fr) * 2013-03-12 2014-09-17 Bayer Technology Services GmbH Procédé de manipulation de matière solide déflagrante sous pression réduite

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CN110234423A (zh) 2019-09-13
JP2020508724A (ja) 2020-03-26
WO2018146044A1 (fr) 2018-08-16
US20190351271A1 (en) 2019-11-21
EP3357571A1 (fr) 2018-08-08

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