JP5643529B2 - Method for producing acetylene - Google Patents

Description

  The present invention relates to an improvement in an acetylene production apparatus and production method.

  The acetylene production method includes a carbide method in which water and calcium carbide are reacted to produce acetylene, as well as a regenerative pyrolysis method using a petroleum hydrocarbon containing natural gas as a raw material, a partial combustion method, and a complete combustion method. The electric arc method is known.

  Among these, the carbide method is that water and calcium carbide as raw materials can be obtained at a relatively low cost, the reaction mechanism is simple, the manufacturing apparatus can be constructed at a low cost, and the manufacturing conditions are compared with other methods. There are advantages such as being gentle and eliminating the need for high temperatures. Therefore, the carbide method is widely used as a method for producing acetylene although it is a classic method.

By the way, the following four systems exist in the acetylene manufacturing apparatus by the carbide method.
The input type manufacturing apparatus, which is the first method, is a method for generating acetylene by introducing a lump of calcium carbide into a tank containing water. In this system, a mixture of by-product calcium hydroxide and a stoichiometric excess of water is generated, resulting in a muddy milk shape.

  The dry manufacturing apparatus that is the second system is a system that controls the water injection so that the amount of water that is reduced is smaller than that of the input manufacturing apparatus and the powdered calcium hydroxide is discharged.

The immersion type manufacturing apparatus which is the third method has a structure in which a cocoon containing calcium carbide is immersed in water.
The water injection type manufacturing apparatus which is the fourth method has a structure for pouring water necessary for generating gas into calcium carbide.

As described above, in any of the methods of the carbide method, acetylene (C ₂ H ₂ ) and a secondary material are obtained from water (H ₂ O) and calcium carbide (CaC ₂ ) as raw materials according to the reaction formula shown in the following formula (1). This is a method for producing raw calcium hydroxide (Ca (OH) ₂ ). Therefore, in order to efficiently consume the entire amount of calcium carbide, it is desirable to add a stoichiometric excess of water as one raw material.
CaC ₂ + 2H ₂ O → CaC ₂ + Ca (OH) ₂ +134 kJ (1)

  When a small amount of calcium carbide is reacted with a large amount of water, there is a merit of absorbing the reaction heat into the water and preventing sudden heat generation, but a large amount of water containing calcium hydroxide is generated as a reaction residue, so sludge treatment Or alkaline wastewater treatment is required.

  On the other hand, when an appropriate amount of water is reacted with calcium carbide, the ambient temperature tends to increase due to reaction heat, and the generated acetylene contains a large amount of water vapor.

By the way, although calcium carbide for acetylene production has a relatively high purity, it contains impurities derived from crustal minerals. Hydrogen sulfide (H ₂ S), phosphine (PH ₃ ) or ammonia (NH ₃ ) is obtained by hydrolysis reaction. It is known that hydride gas such as is generated.

  When these hydride gases react with a large amount of water to generate calcium in a large amount of acetylene, the hydride is purified using alkali cleaning or ricazole (mainly ferric chloride). Method is used. Moreover, in the case of a small scale, the method of removing with activated carbon or a zeolite type adsorbent is known (patent documents 1 and 2).

However, in the method of removing using the adsorbents described in Patent Documents 1 and 2, there is no specific description that acetylene itself is adsorbed on these adsorbents, and acetylene is not discharged until it is saturated. On the other hand, there is a problem that the temperature rises due to heat of adsorption when acetylene itself adsorbs in large quantities.
Further, when the adsorption amount of the adsorbent is saturated, there is a possibility that impurities are discharged without being completely removed, and an excessive adsorbent may be required.

JP 2004-148257 A Japanese Patent Publication No. 8-25917

  The present invention has been made in view of the above circumstances, and provides an apparatus and a method for producing acetylene by which hydride gas can be efficiently removed with an adsorbent and purified high-purity acetylene gas can be easily obtained. The purpose is to provide.

In order to achieve the above object, the present invention employs the following configuration.
That is, the invention according to claim 1 of the present invention includes an acetylene generation unit, an acetylene purification unit, a purge gas line having a flow rate control mechanism, and an exhaust line having a vacuum device,
The acetylene purification unit has one or more adsorption cylinders filled with an adsorbent for removing hydride gas, a temperature adjustment mechanism for heating or cooling the adsorption cylinder, and a flow rate control mechanism, and has been purified. The crude acetylene gas produced by the acetylene generator is produced using an acetylene production apparatus comprising a supply path for filling the adsorption cylinder with the acetylene and a temperature monitoring mechanism for monitoring the temperature in the adsorption cylinder. A method for producing acetylene purified by an acetylene purification unit, comprising: a first process for desorbing a component adsorbed by the adsorbent from the adsorption cylinder; and a second process for filling the adsorption cylinder with purified acetylene. In the second step, the temperature in the adsorption cylinder is monitored, and when the temperature in the adsorption cylinder reaches a predetermined temperature, the amount of purified acetylene charged into the adsorption cylinder A method for producing acetylene and controls.

According to a second aspect of the present invention, the acetylene purification unit includes two or more adsorption cylinders arranged in series and an impurity monitoring mechanism capable of measuring an impurity component concentration, and is arranged in series. The method for producing acetylene according to claim 1, wherein the impurity monitoring mechanism is disposed between the adsorption cylinders provided.

The invention according to claim 3 of the present invention comprises an acetylene generating section, an acetylene purifying section, a purge gas line having a flow rate control mechanism, and an exhaust line having a vacuum device, wherein the acetylene purifying section has a hydride gas. 2 or more adsorption cylinders arranged in series, a temperature adjustment mechanism for heating or cooling the adsorption cylinder, and a flow rate control mechanism, and the purified acetylene is A supply path for filling the adsorption cylinder, a temperature monitoring mechanism for monitoring the temperature in the adsorption cylinder, and an impurity monitor capable of measuring the concentration of impurity components arranged between the adsorption cylinders arranged in series An acetylene production method using an acetylene production apparatus comprising a mechanism, and measuring an impurity component concentration between adsorption cylinders arranged in series, and when the impurity component reaches a predetermined concentration ,straight Complete removal of the hydride gas by the upstream side of the adsorption cylinder of disposed the adsorption column in a method for producing acetylene, characterized in that to start the removal of the hydride gas by the downstream side of the adsorption cylinder.

  As described above, according to the acetylene production apparatus and production method of the present invention, the acetylene purification unit has one or more adsorption cylinders, a temperature control mechanism, a supply path for filling the adsorption cylinders with the purified acetylene, And a temperature monitoring mechanism for monitoring the temperature in the adsorption cylinder.When the component adsorbed by the adsorbent is desorbed from the adsorption cylinder and then the purified acetylene is filled in the adsorption cylinder, the temperature in the adsorption cylinder is adjusted. Monitoring is performed, and when the temperature in the adsorption cylinder reaches a predetermined temperature, the filling amount of the purified acetylene in the adsorption cylinder is controlled. For this reason, it is possible to suppress runaway heat of adsorption when the regenerated adsorption cylinder is filled with purified acetylene gas, and an acetylene explosive reaction can be prevented. Therefore, it is possible to provide an acetylene production apparatus and production method that can efficiently remove hydride gas with an adsorbent and easily obtain purified high-purity acetylene gas.

  According to the second aspect of the invention, the acetylene purification unit includes two or more adsorption cylinders arranged in series and an impurity monitoring mechanism arranged between the adsorption cylinders. Measures the impurity component concentration between the adsorbing cylinders installed, and completes removal of hydride gas by the upstream adsorbing cylinder among the adsorbing cylinders arranged in series when the impurity component reaches a predetermined concentration Then, the removal of the hydride gas by the downstream adsorption cylinder is started. Thus, by monitoring the adsorption capacity of impurities in the upstream adsorption cylinder between the adsorption cylinders arranged in series, the effective range of the breakthrough zone of the adsorbent can be extended.

FIG. 1 is a schematic view showing an acetylene production apparatus and gas flow according to an embodiment to which the present invention is applied. FIG. 2 is a schematic view showing another gas flow of the acetylene production apparatus as an embodiment to which the present invention is applied.

Hereinafter, an acetylene manufacturing apparatus to which the present invention is applied will be described in detail with reference to the drawings together with an acetylene manufacturing method using the same.
In addition, in the drawings used in the following description, in order to make the features easy to understand, there are cases where the portions that become the features are enlarged for the sake of convenience, and the dimensional ratios of the respective components are not always the same as the actual ones. Absent.

FIG. 1 is a schematic view showing an acetylene production apparatus and gas flow according to an embodiment to which the present invention is applied.
As shown in FIG. 1, an acetylene production apparatus (hereinafter simply referred to as “production apparatus”) 1 of the present embodiment includes an acetylene generation unit 2 that generates crude acetylene gas, and an acetylene purification unit 3 that purifies the crude acetylene gas. And a purge gas line L1 for supplying an inert gas such as nitrogen and an exhaust line L2 for discharging combustible exhaust gas out of the system.

  The acetylene generator 2 is not particularly limited as long as it can generate a crude acetylene gas. As the acetylene generator 2 of the present embodiment, it is preferable to use a small-scale acetylene generator that can be used at a use point. Further, the crude acetylene gas generated in the acetylene generator 2 is temporarily stored in the crude acetylene gas storage tank 4.

The acetylene purification unit 3 includes one or more adsorption cylinders filled with a crude acetylene storage tank 4 for temporarily storing the crude acetylene gas generated by the acetylene generation unit 2 and an adsorbent 7 for removing hydride gas. 6 (6A, 6B), a purified acetylene gas storage tank 11 for temporarily storing the purified acetylene gas purified by the adsorption cylinder 6, and paths L3 to L24 for connecting the adsorption cylinder 6 in parallel or in series, Open / close valves V _{1 to} V ₂₀ provided in the path are schematically configured. Further, a supply path for filling the adsorption cylinder 6 with the purified acetylene gas from the purified acetylene gas storage tank 11, and a gas detector (impurity monitoring mechanism) 14 provided in a path L24 between the adsorption cylinders 6A and 6B, I have.

  A flow rate controller 5 for controlling the supply amount of the crude acetylene gas is provided in the path L3 for supplying the crude acetylene gas from the ancestor acetylene storage tank 4 to the adsorption cylinder 6.

  The adsorption cylinder 6 (6A, 6B) is a cylindrical reaction vessel having heat resistance and pressure resistance. The shape of the container is not particularly limited. The adsorbent cylinder 6 is filled with an adsorbent 7 for removing hydride gas. A plurality of thermometers (temperature monitoring mechanisms) 8 are provided on the peripheral wall portion of the adsorption cylinder 6 at predetermined intervals in the height direction of the adsorption cylinder 6 so that the temperature inside the adsorption cylinder 6 can be measured. It is said that. Further, a heating / cooling device (temperature adjustment mechanism) 9 for heating or cooling the adsorption cylinder 6 is provided around the adsorption cylinder 6. Furthermore, the adsorption cylinder 6 is provided with a pressure gauge 10 for confirming the internal pressure.

The adsorbent 7 is not particularly limited as long as it can remove hydride gas such as hydrogen sulfide (H ₂ S), phosphine (PH ₃ ) or ammonia (NH ₃ ) contained in the crude argon gas. is not. Examples of the adsorbent 7 include activated carbon and zeolite.

A supply path for filling the adsorption cylinder 6 with the purified acetylene gas from the purified acetylene gas storage tank 11 can be constructed by appropriately selecting the path and the open / close valve. Specifically, for example, the supply path to the adsorption column 6A selects the path L14, L15, L15, L8, constructed by the _V12, V 14, _{V 7} provided in the middle and open.
Further, a flow rate controller (flow rate control mechanism) 12 is provided in the supply path in order to control the flow rate of the purified acetylene gas from the purified acetylene gas storage tank 11.

  The purge gas line L1 is a path provided for supplying an inert gas such as nitrogen to a predetermined location. The purge gas line L1 is branched into a path L14 and a path L15, and when the adsorption cylinder 6 is regenerated, the inert gas is supplied into the adsorption cylinder 6 through the path 15. Further, as described above, the flow rate of the inert gas can be controlled by the flow rate controller 12 provided in the path 15. The purge gas line L1 may be shared between the acetylene generation unit 2 and the acetylene purification unit 3.

The exhaust line L2 is a path provided for discharging combustible exhaust gas out of the system. In the acetylene refining unit 3, the open / close valves V ₁₉ and V ₂₀ provided in the paths L 22 and L 23 from the adsorption cylinders 6 A and 6 B can be connected to each other to be opened. The exhaust line L2 is provided with a vacuum pump (vacuum device) 13 so that the inside of the diameter can be forcibly exhausted. The exhaust line L2 is connected to a path L25 that bypasses the vacuum pump 13, and is configured so that combustible exhaust gas does not stay in the exhaust line L2. The exhaust line L2 may be shared between the acetylene generation unit 2 and the acetylene purification unit 3.

<First Embodiment>
A method for producing acetylene according to the first embodiment using the production apparatus 1 (hereinafter simply referred to as “production method”) will be described.
In the manufacturing method of this embodiment, the acetylene gas is continuously purified as a whole by connecting the adsorption cylinders 6A and 6B in parallel and switching between the purification process and the regeneration process. In the present embodiment, as shown in FIG. 1, a method of regenerating the adsorption cylinder 6B while purifying the crude acetylene gas in the adsorption cylinder 6A will be described as an example.

(Purification process)
As shown in FIG. 1, first, the opening / closing valves V ₁ , V ₃ , V ₅ , V ₇ , V 9, V ₁₁ of the acetylene purification unit 3 are opened, and the opening / closing valves V ₂ , V ₁₀ , V ₁₄ , V ₁₆ , V ₁₈ and V ₂₀ are closed. Thus, the crude acetylene gas is supplied from the coarse acetylene gas storage tank 4 via the flow rate controller 5 into the adsorption cylinder 6A from the path L6 side. The acetylene gas purified by removing the hydride gas by the adsorbent 7 is stored in the purified acetylene gas storage tank 11 via the paths L8, L10, and L12. Incidentally, purified acetylene gas by opening and closing valve V ₁₁ provided in the path L13, it can be supplied from the manufacturing apparatus 1 in the point of use.

(Regeneration process)
On the other hand, in the adsorption cylinder 6B in which the adsorption amount of the filled adsorbent 7 is saturated with the impurity component, a regeneration process is performed.
The regeneration process of the present embodiment is roughly configured to include a first process for desorbing the component adsorbed by the adsorbent 7 from the adsorption cylinder 6B and a second process for filling the adsorption cylinder 6B with purified acetylene. Yes.

(First process)
In the first process, the adsorbed components are heated to a temperature at which they are desorbed, and these components are removed by extruding or pulling out the desorbed components. The manufacturing apparatus 1 used in the manufacturing method of the present embodiment is provided with a heating / cooling apparatus 9 that can heat the adsorption cylinder 6 until the impurity component is desorbed. Moreover, it has the purge gas line L1 for extruding the component desorbed from the adsorbent 7. Furthermore, after introducing the purge gas into the adsorption cylinder 6, it has an exhaust line L2 provided with a vacuum pump 13 for pulling out.
By appropriately operating these, the components adsorbed by the adsorbent 7 can be desorbed and removed from the adsorption cylinder 6B.

(Second process)
In the second process, purified acetylene is filled into the adsorption cylinder 6B after the first process. Specifically, the opening / closing valves V ₈ , V ₁₂ , V ₁₃ are opened, and the opening / closing valves V ₆ , V ₁₀ , V ₁₄ , V ₁₅ , V ₂₁ are closed. As a result, a portion of the purified acetylene gas stored in the purified acetylene tank 11 is filled into the adsorption cylinder 6B via the paths L9, L14, L15, and L16.

  By the way, the adsorbent 7 in the adsorption cylinder 6B after the first process is in a state of high purification capacity. And the activated carbon, zeolite, etc. which comprise the adsorbent 7 are in the state which tends to adsorb | suck acetylene gas more. In such a case, if the acetylene gas is allowed to flow through the regenerated adsorption cylinder 6B, the acetylene gas is adsorbed to the adsorbent 7 until the total amount reaches the adsorption equilibrium. Therefore, the temperature rise in the adsorption cylinder 6B due to the adsorption heat of acetylene Will continue. Here, since acetylene is a gas with high explosive properties, there is a risk that the risk of explosion may increase due to such a temperature rise in the adsorption cylinder 6B.

  Therefore, in the manufacturing method of the present embodiment, in the second process described above, the temperature in the adsorption cylinder 6B is monitored by a plurality of thermometers (temperature monitoring mechanisms) 8, and the temperature in the adsorption cylinder 6B becomes a predetermined temperature. When it reaches, the filling amount of the purified acetylene from the purified acetylene gas storage tank 11 into the adsorption cylinder 6B is controlled by the flow meter 12.

Thereby, since the excessive temperature rise in adsorption cylinder 6B by adsorption heat can be controlled, the danger that acetylene will explode can be reduced.
It is also effective to cool the adsorption cylinder 6B by a heating / cooling device (temperature adjusting mechanism) 9 in order to suppress the temperature rise in the adsorption cylinder 6B.

  As described above, according to the acetylene production method of the present embodiment, the acetylene purification unit 3 has one or more adsorption cylinders 6 (6A, 6B), the heating / cooling device 9, and the purified acetylene adsorption cylinder. 6 and a plurality of thermometers 8 for monitoring the temperature in the adsorption cylinder 6, and the components adsorbed by the adsorbent 7 are desorbed from the adsorption cylinder 6. Thereafter, when the purified acetylene is filled in the adsorption cylinder 6, the temperature in the adsorption cylinder 6 is monitored, and when the temperature in the adsorption cylinder 6 reaches a predetermined temperature, the purified acetylene enters the adsorption cylinder 6. The filling amount is controlled. For this reason, it becomes possible to suppress the runaway heat of adsorption when the regenerated adsorption cylinder 6 is filled with the purified acetylene gas, and an acetylene explosive reaction can be prevented. Therefore, it is possible to provide an acetylene production apparatus 1 and a production method that can efficiently remove hydride gas with an adsorbent and easily obtain purified high-purity acetylene gas.

<Second Embodiment>
A manufacturing method of the second embodiment using the manufacturing apparatus 1 will be described.
In the manufacturing method of this embodiment, the adsorption cylinders 6A and 6B are connected in series, and a gas detector (impurity monitoring mechanism) 14 is installed between them to purify acetylene gas while lengthening the adsorption cylinder switching cycle. To do. In the present embodiment, as shown in FIG. 2, a case where the suction cylinder 6B is connected in series so that the suction cylinder 6B is on the upstream side and the suction cylinder 6A is on the downstream side will be described as an example.

As shown in FIG. 2, in the manufacturing method of the present embodiment, the on-off valves V ₂ , V _{4 to} V ₉ , V ₁₁ , V ₁₅ , V ₁₈ , V ₂₂ are opened, and the other on-off valves are closed. Thus, the crude acetylene gas is supplied from the crude acetylene gas storage tank 4 into the adsorption cylinder 6B. The acetylene gas purified by removing the hydride gas by the adsorbent 7 passes through the gas detectors 14, L20, L6 and the adsorption cylinders 6A, L8, L10, L12 provided in the paths L9, L18, L24, L24. It is stored in the purified acetylene gas storage tank 11.

  By the way, when two or more adsorption cylinders are connected in parallel and the acetylene gas is continuously purified by switching between the two cylinders, the crude acetylene gas is purified in one adsorption cylinder for a certain period of time and then switched to the other adsorption cylinder. To do. In this method, if impurities are detected in the subsequent stage of the adsorption cylinder, they are mixed in the purified acetylene as they are, so that an adsorbent margin is required. In addition, when an adsorbent having a long breakthrough zone is filled, there is a problem that even if the adsorbing capacity of the adsorbent remains, the remaining adsorbing capacity must be discarded.

  Therefore, in the manufacturing method of the present embodiment, the impurity component concentration between the adsorption cylinders 6A and 6B arranged in series is measured by the gas detector 14, and when the impurity component reaches a predetermined concentration, it is arranged in series. Of the provided adsorption cylinders, the removal of the hydride gas by the upstream adsorption cylinder 6B is completed, and the removal of the hydride gas by the downstream adsorption cylinder 6A is started. As a result, the adsorbent 7 filled in the upstream adsorption cylinder 6B can be used until the impurity concentration is saturated. Therefore, it is possible to efficiently purify the argon gas by fully using the adsorption performance of the adsorbent 7.

  As described above, according to the manufacturing method of the present embodiment, the acetylene purification unit 3 has two or more adsorption cylinders 6A and 6B arranged in series and the gas arranged in the path L24 between the adsorption cylinders. A detector 14, and measures the concentration of the impurity component between the adsorption cylinders 6A and 6B arranged in series. When the impurity component reaches a predetermined concentration, the adsorption cylinder arranged in series. Among them, the removal of the hydride gas by the upstream adsorption cylinder 6B is completed, and the removal of the hydride gas by the downstream adsorption cylinder 6A is started. Thus, by monitoring the adsorption capacity of impurities in the upstream adsorption cylinder 6B between the adsorption cylinders 6A and 6B arranged in series, the effective range of the breakthrough zone of the adsorbent 7 can be extended. Become.

Specific examples are shown below.
Example 1
The acetylene production apparatus 1 in the gas flow state shown in FIG. 1 was used to regenerate the adsorption cylinder and to fill with purified acetylene. Acetylene was continuously passed through the adsorption cylinder filled with the regenerated activated carbon at an empty cylinder speed of 30 cm / sec. When the temperature rise width becomes 15 ° C./sec or more, the filling of the purified acetylene gas is stopped, and when the temperature rise width becomes −0.1 ° C./sec or less, the filling of the purified acetylene gas is performed. Repeated to start. As a result, the maximum rising temperature was about 90 ° C.

(Example 2)
Using the acetylene production apparatus 1 in the gas flow state shown in FIG. 2, crude acetylene gas is introduced into the adsorption cylinder at an empty cylinder speed of 30 cm / sec, and the impurity component at the outlet of the adsorption cylinder is fixed to hydrogen sulfide (H ₂ S). Then, concentration measurement was performed. As a result, it is possible to use twice as much time as the time management when connecting two cylinders in parallel until the hydrogen sulfide between the adsorption cylinders is detected. It took about an hour. In the time management method in the case where two cylinders are connected in parallel, the adsorption capacity of this difference was discarded, and it was confirmed that the adsorbent can be used efficiently.

DESCRIPTION OF SYMBOLS 1 ... Manufacturing apparatus of acetylene 2 ... Acetylene generation part 3 ... Acetylene refinement | purification part 4 ... Coarse acetylene gas storage tank 5 ... Flow controller 6 (6A, 6B) ... Adsorption cylinder 7. ..Adsorbent 8 ... Thermometer (temperature monitoring mechanism)
9 ... Heating / cooling device (temperature control mechanism)
10 ... Pressure gauge 11 ... Purified acetylene gas storage tank 12 ... Flow rate controller (flow rate control mechanism)
13 ... Vacuum pump (vacuum device)
14 ... Gas detector (impurity monitoring mechanism)
L1 · · · purge gas line L2 · · · exhaust line L3～L25 · · · route _V 1 _{~V 23} ··· off valve

Claims (3)

An acetylene generation unit, an acetylene purification unit, a purge gas line having a flow rate control mechanism, and an exhaust line having a vacuum device,
The acetylene purification unit has one or more adsorption cylinders filled with an adsorbent for removing hydride gas, a temperature adjustment mechanism for heating or cooling the adsorption cylinder, and a flow rate control mechanism, and has been purified. The crude acetylene gas produced by the acetylene generator is produced using an acetylene production apparatus comprising a supply path for filling the adsorption cylinder with the acetylene and a temperature monitoring mechanism for monitoring the temperature in the adsorption cylinder. a method for manufacturing acetylene purified by acetylene purification unit,
A first step of desorbing a component adsorbed by the adsorbent from the adsorption cylinder;
A second step of filling the adsorption cylinder with purified acetylene,
In the second process, the temperature in the adsorption cylinder is monitored,
A method for producing acetylene, comprising controlling a filling amount of purified acetylene into the adsorption cylinder when the temperature in the adsorption cylinder reaches a predetermined temperature. The acetylene purification unit includes two or more adsorption cylinders arranged in series, and an impurity monitoring mechanism capable of measuring an impurity component concentration,
The method for producing acetylene according to claim 1, wherein the impurity monitoring mechanism is arranged between the adsorption cylinders arranged in series. An acetylene generation unit, an acetylene purification unit, a purge gas line having a flow rate control mechanism, and an exhaust line having a vacuum device,
The acetylene refining unit is filled with an adsorbent for removing hydride gas and has two or more adsorption cylinders arranged in series, a temperature adjustment mechanism for heating or cooling the adsorption cylinder, and a flow rate control mechanism. And a supply path for filling the adsorption cylinder with the purified acetylene, a temperature monitoring mechanism for monitoring the temperature in the adsorption cylinder, and impurities arranged between the adsorption cylinders arranged in series An acetylene production method using an acetylene production apparatus comprising an impurity monitoring mechanism capable of measuring a component concentration ,
The impurity component concentration between the adsorption cylinders arranged in series is measured, and when the impurity component reaches a predetermined concentration, the hydride gas of the adsorption cylinder upstream from the adsorption cylinders arranged in series is measured. A method for producing acetylene, characterized in that the removal is completed and the removal of hydride gas by an adsorption cylinder on the downstream side is started.

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