TW201637714A - Reactor for pressure reactions with a corrosive liquid and process for producing hydrogen peroxide using the reactor - Google Patents

Abstract

A reactor which comprises an outer pressure vessel having a plurality of elevations on its interior wall and a reaction vessel arranged therein, the exterior wall of said reaction vessel resting on the elevations of the outer vessel, where a barrier liquid in the interspace between outer pressure vessel and reaction vessel provides for pressure relief on the reaction vessel and for detection of corrosion damage to the reaction vessel, is suitable for pressure reactions with a corrosive liquid and is used for the reaction of hydrogen and oxygen to hydrogen peroxide in an aqueous or alcoholic solvent in the presence of bromide and/or iodide and of acid.

Description

Reactor for corrosive liquids participating in pressure reaction and method for producing hydrogen peroxide using the same

The present invention relates to a reactor in which a pressure reaction can be safely carried out in a corrosive liquid and to produce hydrogen peroxide by reacting hydrogen and oxygen on a noble metal-containing catalyst under pressure in the reactor. method.

Hydrogen peroxide is currently produced on an industrial scale by the anthraquinone process. An alternative to the notion that has not yet reached industrial maturity is the so-called direct hydrogen peroxide synthesis, which converts hydrogen and oxygen to hydrogen peroxide on a noble metal-containing catalyst. This reaction is carried out in an aqueous or alcoholic solvent. In order to achieve good space-time yield and hydrogen peroxide selectivity, the reaction needs to be carried out under pressure in the presence of bromide or iodide and in the presence of an acid. Therefore, the reaction mixture used in the direct synthesis of hydrogen peroxide is highly corrosive and causes pitting corrosion of structural metal materials (such as stainless steel or hastelloy alloy) which are used industrially for manufacturing pressure vessels. Pitting corrosion and stress corrosion cracking. Therefore, industrial implementation of direct synthesis of hydrogen peroxide requires a pressure reactor in which a reaction with a corrosive liquid reaction medium can be carried out without corrosion causing damage to the pressure member of the reactor.

WO 2005/108285 proposes direct hydrogen peroxide synthesis in a stainless steel reactor in such a way that no part of the surface is continuously in contact with the gas phase present in the reactor to avoid corrosion of the stainless steel. This concept requires a means to ensure that the inner surface of the reactor is completely wetted by the liquid, which (especially a reactor having a fixed bed containing a catalyst disposed therein) requires considerable engineering complexity to achieve. In addition, with this concept, the design or operational error of the reactor can cause undetected damage to the pressure vessel caused by pitting or stress corrosion cracking.

WO 2005/108285 proposes to use a reactor made of corrosion resistant duplex stainless steel with a PREN number of more than 34 for the direct synthesis of hydrogen peroxide.

The prior art discloses coating the interior of a pressure vessel with a corrosion resistant fluorinated polymer to avoid corrosion. However, such coatings are not suitable for the direct synthesis of hydrogen peroxide because hydrogen peroxide is a coating that diffuses through the coating and causes degradation of the interface between the coating and the vessel wall from the vessel wall. Get rid of.

The prior art additionally discloses that a reaction vessel made of a corrosion-resistant material is disposed inside the pressure vessel and a gap between the pressure vessel and the reaction vessel is a reactor filled (under positive pressure) with an isolating medium such as a gas or a spacer.

GB 1,068,757 describes an external pressure vessel, a reaction vessel made of a corrosion-resistant material disposed in the pressure vessel, a liquid filled in a space between the pressure vessel and the reaction vessel, and a liquid in the liquid and the reaction vessel. The pressure between the internal pressure balances the vessel. The outer pressure vessel and the inner reaction vessel are each composed of a top part and a bottom part (connected with a flange having a diameter equal to the largest reactor cross section).

DE 1 542 005 describes a reaction vessel comprising an external pressure vessel, a corrosion-resistant material arranged in the pressure vessel, wherein the reaction vessel is not in contact with the wall of the pressure vessel, and is filled in the pressure vessel and the reaction vessel. a space between the liquid and a pressure equalization vessel disposed above the highest point of the reactor and pressurized to the liquid by a hydrostatic pressure to a slight positive pressure relative to the interior of the reaction vessel Pressure reactor. In the case of a pressure reactor as disclosed in DE 1 542 005, the reaction vessel is integrally mounted, and the pressure vessel needs to have a corresponding large opening. If the reaction vessel is damaged by corrosion, the pressure vessel needs to be opened and removed from the reaction vessel.

US 7,329,395 describes in FIG. 9 a pressure reactor for treating organic waste with supercritical water comprising an external pressure vessel and a reaction vessel made of a corrosion resistant material disposed within the pressure vessel. The space between the pressure vessel and the reaction vessel is filled with water, and a device for measuring pH or conductivity is used to monitor whether material from the reaction vessel enters the pressure vessel and the reaction vessel via a hole or crack in the reaction vessel. The gap between them. In the reactor shown in the drawings of US 7,329,395, the external pressure vessel is composed of a plurality of components (by having a reaction vessel equal to The flange of the largest cross section is connected).

DE 44 43 078 describes a pressure reactor for oxidation in supercritical water, which comprises an external pressure tube and an internal reaction tube made of a corrosion-resistant material, wherein the annular slit between the two tubes is filled with Corrosive isolating solution. The pressure between the annular slit and the inner reaction tube is balanced via a slit, a bore or a slit, and a spacer flow is passed from the annular gap into the reaction tube through the openings.

US 6,939,521 describes a fluoropolymer reactor having a heat exchanger sleeve for reacting corrosive materials under pressure. The fluoropolymer reactor comprises an external pressure vessel and a reaction vessel disposed therein that may be comprised of a fluoropolymer or a metal container coated internally with a fluoropolymer or containing a lining made of a fluoropolymer. A gap between the pressure vessel and the reaction vessel is cooled or heated to flow therethrough. The reactor can include a pressure equalization device to effect a pressure balance between the reaction vessel and the gap. The exterior of the reaction vessel may have a baffle that is fused to the other, and the baffles may contact the inner wall of the pressure vessel. This document additionally describes a tool for monitoring the liquid in the gap to detect leakage.

These prior art reactors have the disadvantage that the reaction vessel needs to be integrally introduced into the pressure vessel. The pressure vessel therefore needs to include a flange having a diameter greater than the diameter of the reaction vessel. In the event that the reaction vessel is subject to corrosion damage, the flange needs to be opened and the reaction vessel presented from the pressure vessel. Industrial scale synthesis by direct synthesis of hydrogen peroxide requires a reaction vessel having a large cross section and an inner diameter greater than 1.5 m. For the above configuration, the large flange required makes the pressure vessel expensive and complicated to manufacture.

Thus, the manufacture of hydrogen peroxide by direct synthesis requires a reactor for a pressure reaction in a corrosive liquid, wherein the pressure-bearing vessel is not exposed to the corrosive reaction medium and only needs to contain a small opening for introduction. Internal parts.

It has been found that the above object can be attained by a reactor comprising an external pressure vessel having a plurality of protrusions on an inner wall and a reaction vessel disposed therein, the outer wall of the reaction vessel resting against the protrusion of the outer vessel Above, and wherein the spacer in the gap between the external pressure vessel and the reaction vessel promotes pressure relief of the reaction vessel and detection of corrosion damage to the reaction vessel.

The invention thus provides a reactor for a pressure reaction of a corrosive liquid comprising a) an external pressure vessel having a plurality of elevations on the inner wall of the pressure vessel, b) a reaction vessel disposed therein The outer pressure vessel and the outer wall thereof abut against the protrusion of the outer pressure vessel, and at least one slot-shaped interspace is formed between the inner wall of the outer pressure vessel and the outer wall of the reaction vessel, c) At least one conduit for feeding reactants into the reaction vessel, and at least one conduit for removing product from the reaction vessel, d) at least one for feeding a barrier liquid into the slit-shaped gap a conduit, and at least one for removing the gap from the slit-shaped gap a chaotropic conduit, e) means for balancing the pressure between the interior of the reaction vessel and the slit-shaped gap, and f) for detecting the supply of reactants to the reaction vessel and/or product in the spacer fluid The device for discharging the reaction vessel.

The present invention further provides a process for producing hydrogen peroxide by using bromide in an aqueous or alcoholic solvent at 10 ^-6 to 10 ^-2 mol/kg in the presence of a noble metal-containing catalyst and/or Hydrogen is reacted with oxygen in the presence of an iodide and an acid of 0.0001 to 0.5 mol/kg at a temperature of from 0 ° C to 90 ° C and a pressure of from 0.5 to 10 MPa, which is carried out in a reaction vessel of the reactor according to the present invention. .

The reactor according to the present invention includes an external pressure vessel having a plurality of protrusions on an inner wall of the pressure vessel; and a reaction vessel disposed in the outer pressure vessel and having an outer wall abutting the protrusion of the outer pressure vessel At least one slit-shaped gap is formed between the inner wall of the outer pressure vessel and the outer wall of the reaction vessel.

The protrusions on the inner wall of the pressure vessel can have any desired geometry. Examples of suitable protrusions include punctiform or linear protrusions, preferably elongate rib shaped protrusions. It is particularly preferred that the outer pressure vessel and the reaction vessel are substantially cylindrical and the projections are constructed as ribs extending substantially parallel to the cylinder axis. The distance between the protrusions is preferably selected to make the reaction vessel and its contents The gravity of the object is transferred to the external pressure vessel via the protrusions, thereby causing the stress in the reaction vessel material to be below a prescribed value. The features of the protrusions are such that the distance between the two protrusions does not exceed 1200 mm, and the preferred line does not exceed 1000 mm. The projections are preferably designed to be separated from each other such that there is a continuous slit-shaped gap between the inner wall of the outer pressure vessel and the outer wall of the reaction vessel. The inner wall of the outer pressure vessel may further have one or more circumferential ribs, which in each case form two or more continuous between the inner wall of the outer pressure vessel and the outer wall of the reaction vessel Slit-shaped gap.

The slit-shaped gap preferably has a slit width (between the inner wall of the outer pressure vessel and the outer wall of the reaction vessel) of 0.5 to 50 mm, more preferably 1 to 30 mm. The protrusions on the inner wall of the pressure vessel are preferably substantially uniform in height and the slit-shaped gap thus has a substantially fixed slit width (on the inner wall of the outer pressure vessel and the outer wall of the reaction vessel) between).

The reactor according to the invention further comprises at least one conduit for feeding reactants into the reaction vessel and at least one conduit for removing product from the reaction vessel. The conduits are preferably constructed such that the material of the outer pressure vessel does not contact the reactants during feeding of the reactants into the reaction vessel and does not contact the product during removal of the product from the reaction vessel.

The reactor according to the present invention further includes at least one conduit for feeding the spacer fluid into the slit-shaped gap, and at least one conduit for removing the spacer fluid from the slit-shaped gap. When the reactor has more than one slit-shaped gap between the inner wall of the outer pressure vessel and the outer wall of the reaction vessel Preferably, each gap is provided with at least one conduit for feeding the spacer fluid and at least one conduit for removing the spacer fluid. The projections on the inner wall of the pressure vessel are preferably constructed such that no dead space is formed between the projections or within the projections during which the spacer fluid cannot flow during the application of the spacer fluid into the slit-shaped gap. . The conduits for feeding the spacer fluid into the slit-shaped gap and the conduits for removing the spacer fluid from the slit-shaped gap are preferably constructed such that they provide a flow of the barrier liquid through the entire slit-shaped gap. Therefore, the conduits for feeding the spacer fluid and for removing the spacer fluid are preferably disposed at opposite ends of the slit-shaped gap. When the outer pressure vessel and the reaction vessel are substantially cylindrical and the protrusions are constructed as ribs extending substantially parallel to a cylinder axis, the spacer fluid is permeable to the slit shape An annular conduit having a gap in the gap and distributed between the ribs. Alternatively, in this embodiment, the distance between the parallel ribs can be made smaller than the slit width and a channel around the reactor can be provided at the feed point of the spacer liquid (the width of the channel is larger than the slit width) to The channel is used as a distributor for the spacer fluid (in parallel channels (between the ribs)).

The reactor according to the invention further comprises means for pressure equalization between the interior of the reaction vessel and the slit-shaped gap. The apparatus may include a measurement point for pressure measurement in the interior of the reaction vessel and in the slit-shaped gap, and a means for changing the pressure in the slit-shaped gap, such as a pump for the isolation fluid for raising the pressure ( Pump) and a pressure retention valve of the spacer fluid. However, the means for pressure equalization is preferably included in the counter The conduit should be balanced by the pressure between the interior of the container and the slit-shaped gap. It is particularly preferred that the means for pressure equalization comprises a siphon conduit having an upper end opening into the interior of the reaction vessel and a lower end opening to the slit-shaped gap. The term siphon conduit is used herein to describe that the conduit is shaped such that even if no liquid flows through the conduit and the end of the conduit opens into the gas space, liquid remains in the conduit (over the entire section of the conduit) to prevent gas Free passage through the catheter. Preferably, the upper end of the siphon conduit is open to the interior of the reaction vessel (at the upper end of the reaction vessel) to achieve a pressure balance between the spacer fluid and the gas volume at the upper end of the reaction vessel. Particularly preferably, the reactor has at least one conduit for feeding the spacer fluid to the upper end of the slit-shaped gap, at least one conduit for feeding the spacer fluid to the lower end of the slit-shaped gap, and at least one for A conduit for removing the spacer fluid from the slit-shaped gap (at the height of the opening of the siphon conduit leading to the inside of the reaction vessel). The construction of a pressure equalization tool such as a siphon catheter (with a spacer that does not destroy the reaction carried out in the reaction vessel) enables an operation in which a small amount of spacer fluid is continuously released to the reaction vessel via the siphon. This can enable pressure equalization without a failure-prone moving part and ensure that the external pressure vessel does not come into contact with corrosive liquids present in the reaction vessel.

The reactor according to the present invention further comprises means for detecting the supply of reactants to the reaction vessel and/or product from the reaction vessel in the spacer fluid. Preferably, the device is coupled to a conduit for removing the spacer fluid from the slit-shaped gap. The detection of the reactants and/or products is preferably by measuring the physical parameters of the spacer (eg, transmittance or for aqueous or aqueous spacers) In terms of conductivity, redox potential or pH, this is achieved. The measuring device used is preferably provided in a conduit for removing the spacer fluid from the slit-shaped gap or in a conduit other than the conduit. Preferably, the reactor comprises a pump-operated recirculation circuit for barrier liquid, which is connected to at least one conduit for feeding the spacer fluid into the slit-shaped gap and at least A conduit connection for removing the spacer fluid from the slit-shaped gap, and means for detecting the supply of reactants to the reaction vessel and/or product discharge from the reaction vessel in the spacer fluid is coupled to the recycle line.

In a preferred embodiment of the reactor according to the present invention, the reaction vessel is composed of a plurality of segments, and the external pressure vessel and the reaction vessel each have an opening, the openings, the zones The stage can be introduced into and removed from the reaction vessel. The openings are preferably located at the upper end of the reactor and are sealed by a shared pressure-bearing lid made of a corrosion resistant material. The sections are combined to be permeable to the sealing strip in the reaction vessel (the sections can thus be removed later). However, it is preferred to assemble the segments in the reaction vessel by welding.

The reactor according to the invention may further comprise additional internal parts within the reaction vessel, such as internal parts for gas distribution, internal parts for liquid distribution, for supporting catalysts Internal parts of the fixed bed, and coolers, for example in the form of a pipe coil or a plate cooler Cooler). Preferably, the internal components have a configuration such that they can be introduced into the reaction vessel via openings in the outer pressure vessel and the reaction vessel and assembled there as desired.

The reactor according to the present invention makes it possible to carry out a pressure reaction of a corrosive liquid using a material which does not have long-term corrosion resistance, and can reliably avoid corrosion damage to an external pressure vessel subjected to pressure. The outer pressure vessel can be constructed from steel, which is cost effective and optimizes mechanical stability. In the case of internal vessels, construction materials that do not exhibit long-term corrosion resistance to the corrosive liquid may be used (the corrosive perforation may occur in the corrosive liquid due to pitting or stress corrosion cracking during the corrosive liquid. During reactor operation) The corrosion perforation of the internal reaction vessel is detected by the means for detecting the reactants and/or products (in the spacer fluid) before causing corrosion damage to the external vessel under pressure. In the pressure vessel The configuration having a protrusion on the wall and the outer wall of the reaction vessel abutting on the protrusion enables the corrosion damage of the reaction container to be easily repaired by removing or cutting away the perforated container portion and inserting or welding the replacement portion, thereby The original geometry of the reaction vessel can be recovered in a simple manner (due to the displacement of the projection against the inner wall of the pressure vessel). When the portion of the vessel that corrodes the perforation is cut, the wall thickness can only be cut through the reaction vessel. Cutting tool, cutting the corroded perforated container portion and welding replacement portion to avoid damage to the protrusion on the inner wall of the pressure vessel, thus enabling For repair without damage to the spacer fluid and a corrosion monitoring performance.

The method for producing hydrogen peroxide according to the present invention comprises causing hydrogen and oxygen in a catalyst containing a noble metal in a reaction vessel of a reactor according to the present invention. The reaction is carried out in the presence of hydrogen peroxide. All catalysts for direct synthesis of hydrogen peroxide and comprising one or more precious metals can be used as catalysts from the prior art. Particularly suitable catalysts are disclosed in EP-A 1 038 833, page 3, line 10 to page 4, line 14; US 6,168,775, column 5, line 65 to column 6, line 64; and WO 2005/ 009611, page 34, line 19 to page 42, line 20. The catalytically active component of the catalyst comprises one or more precious metals in pure form or in the form of an alloy. Preferred noble metals are platinum group metals, particularly palladium, and gold. There may also be elements from the group consisting of Rh, Ru, Ir, Cu, and Ag. A particularly preferred catalyst comprises (as a catalytically active metal) at least 80% by weight of palladium and from 0 to 20% by weight of platinum.

Preferably, a supported catalyst is used, wherein the (or the) catalytically active precious metal is on the surface of the support material. Preferably, oxidic or silicaic support materials are used, particularly alumina, vermiculite, titania, zirconia and zeolite. Alternatively, a carbon-based carrier such as an activated carbon carrier can be used. The support material can be used in the form of a powder, an extrudate, a pellet or a shaped body having a channel. Preferably, the catalyst is a supported noble metal catalyst disposed in the reaction vessel in the form of a fixed bed. The size of the particles in the fixed bed can be selected in a wide range, especially in the range of 0.1 to 10 mm. Smaller particle sizes can cause a pressure drop, while too large a particle size can make a catalytically-active surface area smaller. A particle size in the range of 0.1 to 5 mm, preferably 1 to 3 mm, results in high productivity.

The reaction is carried out in an aqueous or alcoholic solvent. It is preferred to use an alcohol selected from the group consisting of methanol, ethanol, n-propanol and n-butanol, particularly preferably methanol. The solvent used in the special system is methanol having a water content of 2 to 10% by weight.

The reaction is carried out in the presence of 10 ^-6 to 10 ^-2 mol/kg of bromide and/or iodide and 0.0001 to 0.5 mol/kg of acid. It is preferred to add 10 ^-5 to 10 ^-3 mol/l of bromide and/or iodide, more preferably 10 ^-5 to 5*10 ^-4 mol/l of bromide. A bromide and/or iodide concentration above this preferred range will impair the stability of the resulting hydrogen peroxide solution, while a halide concentration below this preferred range will generally result in hydrogen peroxide selectivity ( Select) falls below the acceptable limit. Further use of the hydrogen peroxide solution formed is considered to be a lower concentration of bromide and/or iodide. The bromide and/or iodide may be added to the reaction medium in the form of an alkali metal or alkaline earth metal salt, preferably NaBr or NaI. HBr or HI can also be added. As the acid, was added pK _a less than preferred system 3, preferably lower than the pK _a of the acid 2. Suitable acids are, in particular, mineral acids such as sulfuric acid, phosphoric acid and nitric acid. Also useful are sulfonic acids and phosphonic acids which are soluble in the medium. The acid concentration is in the range of 0.0001 to 0.5 mol/l, preferably in the range of 0.001 to 0.1 mol/l. Higher acid concentrations can cause the liquid phase to become undesirably corrosive, while lower acid concentrations can cause a decrease in hydrogen peroxide selectivity. Considering the further use of the formed hydrogen peroxide solution, a relatively low acid concentration is preferred.

The reaction is carried out at a temperature of from 0 ° C to 90 ° C, preferably from 20 ° C to 50 ° C, and at a pressure of from 0.5 to 10 MPa, preferably from 0.5 to 6 MPa.

The reaction is preferably carried out with a gas mixture comprising hydrogen and oxygen (a composition selected such that the gas mixture does not explode). It is preferred to use a gas mixture that is reliably outside the explosion range even considering the established partial pressure of the solvent. The gas mixture advantageously further comprises, in addition to hydrogen and oxygen, one or more inert gases, preferably nitrogen and/or carbon dioxide, more preferably carbon dioxide. The hydrogen content of the gas mixture is preferably limited to not more than 6% by volume, more preferably not more than 5% by volume. More specifically, the hydrogen content is in the range of 3 to 5% by volume. The oxygen content of the gas mixture can be stoichiometric or superstoichiometric, preferably in the range of 10 to 50% by volume, more particularly 15 to 45% by volume. Hydrogen and oxygen are preferably supplied to the reactor separately. Oxygen can be supplied in pure form or in the form of air or in the form of oxygen-enriched air. It is preferred to use oxygen in pure form. The residual gas obtained at the outlet of the reactor can be completely or partially recycled to the reactor to reduce the cost and complexity of recovering unconverted hydrogen.

The method according to the invention preferably comprises operating the reactor as a packed bubble-column by placing a fixed bed containing a noble metal-loaded catalyst in the reaction vessel, from the fixed bed The solvent/reaction medium used is supplied, and the liquid reaction mixture containing the formed hydrogen peroxide is withdrawn on the fixed bed so that a gas space having a gas-liquid phase interface is formed on the fixed bed (on the fixed bed) And dispersing hydrogen and oxygen in the form of bubbles under the fixed bed.

The method for producing hydrogen peroxide according to the present invention preferably uses water, A water-miscible alcohol or a mixture of water and such an alcohol acts as a spacer. Particularly preferred is the use of an aqueous or alcoholic solvent for the reaction of hydrogen with oxygen (but without the addition of bromide, iodide or acid) as the spacer. The advantage is that the spacer entering the reaction vessel does not destroy the reaction, and the leak can be easily detected by changing the conductivity, pH or redox potential by entering the spacer by bromide or iodide ions or acid. .

Preferably, the apparatus according to the present invention is carried out in a reactor according to the present invention, wherein the apparatus for balancing the pressure between the interior of the reaction vessel and the slit-shaped gap comprises the above-described siphon conduit, and the reaction system The gas space is formed above the liquid reaction mixture in the reaction vessel and the upper end of the siphon conduit is opened to the gas space. This promotes a simple pressure balance between the reaction vessel and the slit-shaped gap and prevents liquid from entering the slit-shaped gap from the reaction vessel and causing corrosion detection errors. In this embodiment, it is preferred to use a reactor comprising a recycle line for the spacer fluid, an aqueous or alcoholic solvent to which no bromide, iodide or acid is added as a spacer, and to isolate during the reaction. The liquid system is continuously supplied to the circulation line. These features create a continuous flow of spacer fluid into the reaction vessel through the siphon conduit, which prevents HBr or HI from the gas space in the reaction vessel from entering the slit-shaped gap.

Experiments have shown that the acid content and bromide and/or iodide content of the reaction medium used in the process according to the invention allows the medium to be used in construction materials commonly used for pressure vessels (such as German material of construction number). ) 1.4571 stainless steel or German material construction number 2.4819 nickel alloy) is corrosive and pitting occurs. This problem cannot be solved by coating the reactor with a corrosion-resistant polymer such as polypropylene, perfluoroalkoxyalkane (PFA) or ethylene chlorotrifluoroethylene copolymer (Halar®). The surface is resolved because the hydrogen peroxide formed under the reaction conditions diffuses through the coating and causes delamination of the coating due to degradation of the underlying metal. In spite of the corrosive reaction medium, the process according to the invention now enables safe hydrogen and oxygen in the presence of a noble metal-containing catalyst in a reaction vessel made of a commercially available material such as stainless steel of the German material construction number 1.4571. The reaction to form hydrogen peroxide. The configuration of the reactor according to the invention makes it possible to use the reaction vessel until the point at which the corrosion actually causes the reaction vessel to leak without any safety risk. This configuration additionally makes it possible to simply repair the reaction vessel damaged by local pitting corrosion.

Claims (13)

A reactor for a pressure reaction of a corrosive liquid, comprising: a) an external pressure vessel having a plurality of elevations on an inner wall of the pressure vessel, b) a reaction vessel disposed at the external pressure The inside of the container and the outer wall thereof abut against the protrusion of the outer pressure vessel, and at least one slit-shaped gap is formed between the inner wall of the outer pressure vessel and the outer wall of the reaction vessel, and c) at least one for feeding the reactants a conduit into the reaction vessel, and at least one conduit for removing product from the reaction vessel, d) at least one conduit for feeding a barrier liquid into the slit-shaped gap, and at least one for a slit-shaped gap for removing the conduit of the spacer fluid, e) means for balancing the pressure between the interior of the reaction vessel and the slit-shaped gap, and f) for detecting the supply of reactants to the reaction in the spacer fluid A device for discharging the container and/or product from the reaction vessel. The reactor of claim 1, wherein the slit-shaped gap has a slit width between the inner wall of the outer pressure vessel and the outer wall of the reaction vessel of 0.5 to 50 mm, more preferably 1 to 30 mm. . The reactor of claim 1 or 2, wherein the protrusions have a long rib shape. The reactor of any one of claims 1 to 3, wherein the reaction vessel is composed of a plurality of sections, and the external pressure vessel and The reaction vessels each have an opening through which the sections can be introduced into and removed from the reaction vessel. The reactor of any one of claims 1 to 4, wherein the reactor further comprises a pump-operated recirculation circuit for isolating liquid, which is connected to at least one for a conduit for the spacer fluid to feed the slit-shaped gap and a conduit connected to the at least one spacer for removing the spacer fluid from the slit-shaped gap, and for detecting the supply of reactants to the reaction vessel and/or product in the spacer fluid A device discharged from the reaction vessel is connected to the circulation line. The reactor of any one of claims 1 to 5, wherein the conduit for feeding the spacer fluid into the slit-shaped gap and the conduit for removing the spacer fluid from the slit-shaped gap are provided Isolation flow of the overall slit-shaped gap. The reactor of any one of claims 1 to 6, wherein the means for balancing the pressure between the inside of the reaction vessel and the slit-shaped gap comprises opening at an upper end thereof to the inside of the reaction vessel And a siphon catheter that opens to the slit-shaped gap at its lower end. The reactor of claim 7, wherein the reactor has at least one conduit for feeding the spacer fluid to the upper end of the slit-shaped gap, and at least one for feeding the spacer fluid into the slit-shaped gap. a conduit at the lower end, and at least one conduit for removing the spacer fluid from the slit-shaped gap at a height that opens into the interior of the siphon conduit inside the reaction vessel. A method for producing hydrogen peroxide by using bromide and/or iodide in an aqueous or alcoholic solvent at 10 ^-6 to 10 ^-2 mol/kg in the presence of a noble metal-containing catalyst and Hydrogen is reacted with oxygen in the presence of an acid of 0.0001 to 0.5 mol/kg at a temperature of from 0 ° C to 90 ° C and a pressure of from 0.5 to 10 MPa, characterized in that the reaction is in any of claims 1 to 8 of the patent application. A reactor is carried out in a reaction vessel. The method of claim 9, wherein an aqueous or alcoholic solvent to which no bromide, iodide or acid is added is used as the spacer. The method of claim 9 or 10, wherein the reaction is carried out in a reactor according to claim 7 or 8 in the following manner: a gas space is formed in the reaction vessel above the liquid reaction mixture, And the means for balancing the pressure between the interior of the reaction vessel and the slit-shaped gap is constructed as a siphon conduit opening at its upper end to the gas space. The method of claim 11, wherein the reactor comprises a circulation line for the spacer liquid, and an aqueous or alcohol solvent which does not add bromide, iodide or acid is used as the spacer liquid, and the spacer liquid is The circulation line is continuously supplied during the reaction. The method of any one of claims 9 to 12, wherein a supported noble metal catalyst disposed in the reaction vessel in the form of a fixed bed is used as a catalyst.