WO2019206451A1

WO2019206451A1 - Production of a gas product which contains at least carbon monoxide

Info

Publication number: WO2019206451A1
Application number: PCT/EP2019/025094
Authority: WO
Inventors: Andreas Peschel; Benjamin HENTSCHEL
Original assignee: Linde Aktiengesellschaft
Priority date: 2018-04-24
Filing date: 2019-04-02
Publication date: 2019-10-31
Also published as: DE102018003342A1

Abstract

The invention relates to a method for producing a gas product which contains at least carbon monoxide, wherein an electrolysis raw product which contains at least carbon dioxide is formed and is subjected to a low-temperature electrolysis process, thereby obtaining a raw gas which contains at least carbon monoxide and carbon dioxide, and the electrolysis raw product is formed from at least part of a starting mixture which contains carbon dioxide using a first carbon dioxide separation process, and/or the gas product is formed from at least part of the raw gas using a second carbon dioxide separation process. The waste heat of the low-temperature electrolysis process is discharged out of the low-temperature electrolysis process using a heat pump and is at least partly transferred to the first and/or second carbon dioxide separation process. The invention likewise relates to a corresponding system (100).

Description

description

Production of a gas product containing at least carbon monoxide

The present invention relates to a process for producing a gas product containing at least carbon monoxide and a corresponding plant according to the respective preambles of the independent claims.

State of the art

Synthesis gas is a predominantly or exclusively carbon monoxide and hydrogen-containing gas mixture. Synthesis gas is currently produced by various methods, e.g. by steam reforming of natural gas or by

Gasification of input materials such as coal, crude oil or natural gas and a subsequent purification.

Hydrogen can also be produced by means of water electrolysis (for example by means of alkaline electrolysis or using a proton exchange membrane). The production of carbon monoxide is by means of high-temperature electrolysis of

Carbon dioxide possible, as disclosed for example in WO 2013/131778 A2. By mixing appropriately prepared hydrogen and carbon monoxide, a synthesis gas can also be obtained.

Another possibility for the production of synthesis gas is the co-electrolysis of water and carbon dioxide. Depending on the electrolyte used and the catalyst used, different configurations exist, which differ in particular from the operating temperature and the electrochemical reactions taking place at the electrodes.

The reaction principles of co-electrolysis of water and carbon dioxide are described below. Instead of a co-electrolysis of water and carbon dioxide, however, a pure carbon dioxide electrolysis can be used in the context of the present invention in particular. It goes without saying that the reaction equations concerning the electrolysis of water do not apply here or appropriate reactions do not expire. However, a separate explanation is omitted for the sake of clarity.

In the so-called low-temperature (NT) co-electrolysis, a

Proton exchange membrane (English: Proton Exchange Membrane, PEM) can be used. In this case, the following cathode reactions take place:

C0 ₂ + 2 e- + 2 H ⁺ -> CO + H ₂ 0 (1) 2 e ^_ + 2 H ⁺ -> H ₂ (2)

The following anode reaction also proceeds:

H ₂ 0 - ^_{_»1/2} 0 ₂ + ₂ H ⁺ - 2e- (3) In variants of any procedure, other positive charge carriers such as ions of an electrolyte salt formed, transported via a correspondingly shaped membrane at the anode instead of protons, and the Cathode be implemented. An example of an electrolyte salt is potassium hydroxide. In this case, the positive charge carriers are potassium ions. Other variants include, for example, the use of anion exchange membranes (AEM). In all variants, however, the transport of

Charge carriers not, as in the below-explained solid oxide electrolysis cells, in the form of oxygen ions, but in the form of the described charge carriers. For details, see, for example, Delacourt et al. (2008) J. Electrochem. Soc. 155 (1), B42-B49, DOI: 10.1 149/1 .2801871.

The protons or other corresponding charge carriers are selectively transferred via a membrane from the anode to the cathode side. Depending on the chosen catalyst, the respective formation reactions compete at the cathode, resulting in synthesis gases with different hydrogen / carbon monoxide ratios. Depending on the configuration of the catalyst used, other products of value may also be formed in the low-temperature co-electrolysis. In high temperature (HT) co-electrolysis carried out using solid oxide electrolysis cells (SOEC), the following cathode reactions are observed or postulated: C0 ₂ + 2 e - »CO + O ² (4)

H ₂ 0 + 2 e- - »H ₂ + O ² - (5)

The following anodic reaction also proceed: 2 O ² -> 0 ₂ + 4 e- (6)

The oxygen ions are in this case conducted essentially selectively via a ceramic membrane from the anode to the cathode. It is not fully understood whether the reaction proceeds according to reaction equation 4 in the manner shown. It is also possible that only hydrogen is formed electrochemically and carbon monoxide forms according to the reverse water gas shift reaction in the presence of carbon dioxide: C0 ₂ + H ₂ H ₂ 0 + CO (7)

In general, the gas mixture formed in the high-temperature co-electrolysis is in the water gas shift equilibrium (or close to this). However, the concrete nature of the formation of carbon monoxide has no influence on the present invention.

Neither in the high-temperature nor in the low-temperature co-electrolysis i.d.R. a complete conversion of carbon dioxide and water, which is why a separation of carbon dioxide must then take place. The carbon dioxide can be recycled for electrolysis. The product obtained after a corresponding separation is a synthesis gas with different depending on the catalyst used

Hydrogen / carbon monoxide ratio.

The electrolysis of carbon dioxide by means of solid oxide electrolysis cells is described, for example, in WO 2014/154253 A1, WO 2013/131778 A2, WO 2015/014527 A1 and EP 2 940 773 A1. Here, an analogous process for the co-electrolysis and a corresponding production of synthesis gas is mentioned. In the cited documents is also a separation of carbon dioxide and

Carbon monoxide using absorption, adsorption, membrane and cryogenic separation methods disclosed, however, no details of the specific embodiment and in particular a combination of the methods are given.

The co-electrolysis of carbon dioxide by means of solid oxide electrolysis cells to synthesis gas has hitherto only been described on a laboratory scale. In particular, a corresponding article by Foit et al. (2016), Angew. Chem. 129 (20), pages 5488 to 5498, DOI: 10.1002 / anie.201607552.

The present invention has as its object to provide improved measures for the production of carbon monoxide or synthesis gas using an electrolysis, in particular a low-temperature (co-) electrolysis.

Disclosure of the invention

Against this background, the present invention proposes a method for

Preparation of a gas product containing at least carbon monoxide and a corresponding plant with the characteristics of the respective independent

Claims. Preferred embodiments are the subject of the dependent claims and the following description. Before explaining the advantages of the present invention, further basics will be explained below and terms used herein will be defined.

Under a "at least carbon monoxide-containing gas product" is here in particular carbon monoxide different purities or synthesis gas or a comparable gas mixture, ie a gas mixture containing not only carbon monoxide but also significant amounts of hydrogen understood.

For example, the at least carbon monoxide-containing gas product

Hydrogen and carbon monoxide contained in equal or comparable proportions. The molar ratio of hydrogen to carbon monoxide in the gas product can in particular in a range of 1: 10 to 10: 1, 2: 8 to 8: 2 or 4: 6 to 6: 4, wherein the molar fraction of hydrogen and carbon dioxide together exceed 50%, 60%, 70%, 80 %, 90%, 95% or 99% can be and any remaining remainder may be formed in particular from carbon dioxide or inert gases such as nitrogen or noble gases of the air. The molar ratio of hydrogen to carbon monoxide in the gas product may be in particular about 1 or about 2 or about 3, the stoichiometry number in particular at about 2. The stoichiometric number SN expresses the composition of the synthesis gas with respect to the components hydrogen, carbon dioxide and carbon monoxide from, wherein each mole fractions are considered x. It is calculated as SN = (x H ₂ -x C0 ₂ ) / (x CO + x C0 ₂ ).

If there is little or no hydrogen present in the raw gas, the gas product is correspondingly poor or free of hydrogen, ie it is a carbon monoxide-rich gas product or pure carbon monoxide.

In general, streams, gas mixtures, etc. as used herein may be rich or poor in one or more components, with the term "rich" being for a content of at least 50%, 60%, 75%, 80%, 90%, 95%, 98%, 99%, 99.5%, 99.9% or 99.99% and the statement "poor" for a maximum content of 50%, 40%, 25%, 20%, 10%, 5%, 2 %, 1%, 0.5%, 0.1% or 0.01% on molar, weight or

Volume base can stand. If more than one component is specified, the term "rich" or "poor" refers to the sum of all components. If, for example, "carbon monoxide" is mentioned here, it can be a pure gas or a mixture rich in carbon monoxide. A gas mixture containing "predominantly" one or more components is particularly rich in this or this in the sense explained.

Material streams, gas mixtures, etc. may also be "enriched" or "depleted" in one or more components as used herein, which terms refer to a content in a starting mixture. They are "enriched" if they are at least 1, 1, 5, 1, 5, 2, 5, 10, 100, or 1, 000 times, "depleted," if at most 0.9 times, 0.75 times, 0.5 times, 0.1 times, 0.01 times or 0.001 times the content of one or more components, based on the

Starting mixture, contained. Advantages of the invention

In the context of the present invention, it has been found to be particularly advantageous to use waste heat from a low-temperature electrolysis, which can be formed as co-electrolysis of carbon dioxide and water, as explained above or as pure carbon dioxide electrolysis, and which is at least subjected to carbon dioxide to obtain carbon monoxide a heat pump to one or more further process steps to transfer.

The use of a heat pump is particularly advantageous in this context, because by means of this at a relatively low temperature level resulting waste heat of low-temperature electrolysis to a higher

Temperature level can be brought. Through the use of the present invention, therefore, the otherwise hardly usable waste heat of

Low-temperature electrolysis can be used advantageously. In conventional methods, heat is dissipated in particular by means of air coolers or cooling water and discharged from the system. The heat pump used in the context of the present invention may be formed in a fundamentally known manner and operated by means of one or more of the working medium also specified below. The or the working fluid is or will be particularly at low pressure, i. at a lower pressure level, vaporized by the heat of low-temperature electrolysis. The working fluid (s) will then be or will be pressurized to one of greater pressure, i. E., By one or more compressors. to an upper pressure level, compressed. Subsequently, or will the or the work equipment on the upper

Pressure level condenses by heat to the or the following explained consuming processes is transmitted. After the heat transfer, or the working fluid or is relaxed and reached again to the lower pressure level or reach in this way again the initial state. For the different function of sorption heat pumps, which can also be used in the context of the present invention, reference is made to the explanations below. For example, as a working fluid in a compression heat pump

For example, methanol used, and is the lower pressure level at about 2 bar abs. and the upper pressure level at about 6 bar abs., Evaporation of methanol at the lower pressure level at about 82 ° C and the condensation at the upper pressure level at about 1 18 ° C. In this case, for example, 1 kW of heat are removed from the low-temperature electrolysis and to the one or more downstream

Transfer processes. The compression to the upper pressure level here is about 0.15 kW, and as a further cooling capacity for the condensation of methanol evaporating in the expansion to the lower pressure level about 0.15 kW as additional cooling capacity, for example in an air cooler needed. Thus, from the waste heat of the low-temperature electrolysis and about 0.15 kW of additional power, for example electricity, about 1 kW of higher-grade heat is generated. Only a small additional cooling capacity is needed. Overall, the present invention proposes a method for producing a gas product comprising at least carbon monoxide, in which an electrolysis insert comprising at least carbon dioxide is formed and subjected to low-temperature electrolysis to obtain a crude gas containing at least carbon monoxide and carbon dioxide, the electrolysis insert comprising at least part of a carbon dioxide containing starting mixture using a first

Carbon dioxide separation is formed and / or the gas product is formed from at least a portion of the raw gas using a second carbon dioxide separation. The electrolysis insert may in particular also contain other components, depending on the process conditions, in particular water, but it may also consist predominantly or exclusively of carbon dioxide. Accordingly, the raw gas may include various other components, in the case of

Low-temperature co-electrolysis, in particular hydrogen and water.

Corresponding further components can also be separated off. The carbon dioxide removal can be subjected to a portion of the raw gas even after a corresponding separation of other components such as water.

The second separation of carbon dioxide used in the formation of the gas product can in particular also be used to form a fraction containing carbon dioxide, which in turn is at least partly used in the formation of the electrolysis insert can be used. In other words, this can be separated

Carbon dioxide be recycled in the process of the present invention.

In the context of the present invention, it is provided that waste heat of the

Low-temperature electrolysis using a heat pump from the

Low-temperature electrolysis dissipated and at least partially to the first and / or the second carbon dioxide separation and / or at least one method assigned to the further process step is transferred. The advantages of using a corresponding heat pump have been explained previously. They are, as mentioned, in particular, that by means of the heat pump resulting at a relatively low temperature level waste heat of

Low-temperature electrolysis brought to a higher temperature level and can be used to advantage. In other words, higher-grade heat can be generated from rather low-grade heat.

In the method according to the invention, the first and / or the second

Kohldioxidabtrennung comprise a laundry in which a washing liquid loaded with carbon dioxide and by expelling the carbon dioxide by means of

Washing liquid supplied regeneration heat is regenerated. Corresponding washes are known in principle from the prior art. Reference is made to the relevant literature. In the case of corresponding washes, a fluid to be processed, in the present case the raw gas or a gas mixture formed using a part of the raw gas, is brought into contact with a washing liquid of suitable type. This is typically done in a corresponding column with suitable internals. The washing liquid is chosen so that the component contained in the fluid to be separated, in this case carbon dioxide, dissolves or binds as much as possible in the washing liquid. The

Washing liquid can be regenerated by heating it in another apparatus, in particular another column, whereby the dissolved or bound component is expelled. The heat used in this context is referred to herein as "regeneration heat". It is provided in the context of the present invention, in particular by means of the heat pump using waste heat of low-temperature electrolysis. The achievable temperature level is particularly suitable for a corresponding use. In the context of the present invention, in particular, a so-called direct air capture, ie a direct removal of carbon dioxide can be made. This is an adsorption or a mixture of adsorption and absorption, wherein a liquid absorbent is applied to a solid and is held there by adhesion and / or cohesive forces. One

Corresponding combined separation principle is not limited to the classic direct air capture but can be used in the context of the present invention in other context. Again, there is a regeneration with heat, so "regeneration heat" as already explained above. In addition to the typical for direct air capture amines as adsorbents and ionic liquids can be used in the present invention. For further details regarding any procedure is also on relevant literature, for example, to the publication "Direct Air Capture of C0 ₂ with Chemicals, a technology assessment for the Panel on Public Affairs" of the American Physical Society from the first June 2011 referenced.

In the context of the present invention, alternatively or additionally, it can be provided that the first and / or the second carbon dioxide separation comprises an adsorption in which an adsorbent is charged with carbon dioxide and regenerated by desorbing the carbon dioxide by means of regeneration heat supplied by the adsorbent. The use of adsorptive processes for the removal of certain components from gas mixtures is also known in principle and described in the literature. In the context of the present invention, in particular a

Temperature change adsorption are used. In particular, in the context of the present invention, a combination of adsorption and absorption can also take place, as mentioned above with reference to the example of direct air capture.

The temperature swing adsorption takes advantage of the temperature dependence of adsorption processes. An adsorbent that is in a suitable

Adsorberbehälter is housed, is thereby flows in an operating cycle at a lower temperature level with the gas mixture stream to be separated and in this case with the or each separated components from the

Loading mixed gas stream. In a subsequent operating cycle, the adsorbent can then be largely freed by heating, ie introducing thermal energy, from this or these components and regenerated in this way. For the Therefore, at least two adsorption units are required for continuous operation of a temperature change adsorption system, so that one of the

Adsorption with the gas mixture stream to be separated flows through and thus can be used to separate the gas mixture stream. This too can be done within the scope of the present invention. The heat used in this context is referred to here as "regeneration heat". It can also be provided in the context of the present invention, in particular by means of the heat pump using waste heat of low-temperature electrolysis. The achievable temperature level is also particularly suitable for use in an adsorptive process as explained.

In other words, in the context of the present invention, the

Regeneration heat for absorptive or adsorptive carbon dioxide removal at least part of the heat pump from the

Low-temperature electrolysis transferred waste heat. In the context of the present invention, it is also possible to use different operating medium flows at different temperature levels and in different quantities.

A laundry, which can be used in the context of the present invention in the first and / or in the second carbon dioxide removal, can, as already mentioned, be carried out in particular in the form of a chemical and / or a physical wash. Here, too, combinations in the form of physico-chemical washes are possible. In a chemical washing, a binding of a component contained in the washing liquid with the component to be separated takes place, here carbon dioxide. In a physical wash is a purely physical absorption without chemical bonding. Also

Mixing methods and combination methods are known and can be used in the context of the present invention. In the context of the present invention, the washing can be carried out in particular by using one or more compounds which consist of inorganic carbonates, amines, alcohols (in particular methanol), one or more organic methyl or ethyl esters (in particular methyl or ethyl acetate), one or more organic compounds Methyl or ethyl ethers (especially dimethyl ether), polyethylene glycol, acetone, acetonitrile, n-methylpyrrolidone, dimethylformamide or Acetonitrile are selected. In the context of the present invention, particular preference may be given to using selexol, Genosorb and / or purisol processes as the laundry process.

In the context of the present invention, the low-temperature electrolysis can be carried out in particular at an electrolysis temperature level which is 20 to 100 ° C., in particular 40 to 80 ° C. A low-temperature electrolysis is operated at appropriate temperature levels, in particular with an efficiency of 30 to 80%, in particular 40 to 70%. This entails that typically 20 to 70%, in particular 30 to 60% of the power used must be dissipated as waste heat. Through the use of the heat pump in the context of the present invention, this comparatively large amount of waste heat, but for use in other process steps initially on an unsuitable

Temperature level is present, yet be used. As explained several times, in a method according to the present invention, the waste heat of the low-temperature electrolysis is advantageously transferred using the heat pump by means of one or more working medium flows at one or more temperature levels above the electrolysis temperature level. For details and the advantages associated with a corresponding heat transfer, reference is expressly made to the above explanations. The

Increase in temperature can be done in particular by 20 to 100 K, more particularly by 30 to 50 K, for example by about 40 K. The more the pressure is increased in a corresponding heat pump, the more it increases

Delivery temperature, as is apparent from the known vapor pressure curves, such as methanol. The more the pressure is raised, the more

Compressor energy must be expended. The expert chooses the

Temperature increase therefore as needed and taking into account the

Energy demand. In a corresponding method, all types of heat pumps, in particular conventional (compression) heat pumps, but also so-called sorption heat pumps can basically be used, as they are

For example, in the field of building services are known, but can also be used in other applications. Reference is made to relevant specialist literature, for example to Chapter 7.2.6, "Sorption heat pumps" at Witz, B. (Edit.), "Professional planning and execution of conventional and regenerative Flaustechnik", Forum-Verlag 2015, ISBN 978-3-86586-187-0.

Sorption heat pumps differ from compression heat pumps in that one or more working fluids are not or will be compressed by a mechanical compressor. Instead, a so-called thermal compressor is used. Sorption heat pumps work like

Compression heat pumps based on a cycle process. However, in this case not mechanical drive energy, for example generated by electric current, but heat is used for compression Sorption heat pump can operate on the basic principles of absorption and adsorption and are also referred to as absorption or Adsorptionswärmepumpen.

In an absorption heat exchanger, a working fluid (for example water) is evaporated in an evaporator. The vaporized working fluid is absorbed by means of another working medium, the so-called solvent (for example lithium bromide). By supplying heat, the working fluid is expelled from the solvent at a higher pressure level and thereafter releases the heat in a condenser as heating energy again. In an absorption heat exchanger, for example, ammonia can be used as a working fluid and water as a solvent. Absorption heat exchangers have the particular advantage that only comparatively little additional (electrical) energy is needed for their operation, essentially for a solvent pump, which transports a solvent-solvent mixture from the evaporator to the expeller.

In contrast, an adsorption heat pump relies on the interaction between adsorption and desorption on a porous solid (adsorbent), such as silica gel or zeolite. In an adsorption heat pump enriched with the working fluid (for example, water) adsorbent through

Heat supply dried. Water vapor is released which flows into the condenser where heat energy is delivered to the heating system. Also in one

Adsorption heat pump is essentially only energy needed for the transport of the working fluid, but not for compression. When a compression heat pump is employed, the fluid stream or streams may or may be formed using, in particular, one or more working fluids comprising or comprising at least one hydrocarbon and / or at least one alcohol, for example methanol or ethanol. In particular, propane, butane and / or dimethyl ether are suitable as hydrocarbons. Corresponding hydrocarbons can be used in heat pumps in the temperature ranges in question here. Heat pumps operated with appropriate non-aqueous working fluids are also referred to as Organic Rankine Cycle (ORC) processes.

In the process of the present invention, corresponding waste heat, alternatively or in addition to use in carbon dioxide removal, as mentioned several times, may also be associated with the process in one or more other

Process steps are used. The further method step (s) may be used in particular for the further processing of at least part of the

Gas product can be used. The method step (s) assigned to the method may in particular comprise one or more constituent chemical synthesis reactions or separation steps, the corresponding ones

Synthesis reactions downstream include. These include, for example, the synthesis of oxygenates, such as methanol; Ethanol, dimethyl ether, dimethylformamide, dimethyl carbonate, polyoxymethylene dimethyl ether, formaldehyde,

Methyl methacrylate, formic, acetic and propionic acid. Further, corresponding synthetic reactions may include the generation of long chain alkenes and alkanes as well as typical Fischer-Tropsch products such as kersoin, gasoline, and waxes. Also, a preparation of phosgene or polycarbonates may be provided. The synthesis reaction (s) may in particular comprise a hydroformylation and / or a synthesis of at least one further alcohol. Hydroformylation is also referred to as oxo synthesis and more rarely as Roelen synthesis or Roelen reaction. It is a homogeneously catalyzed reaction of olefins with carbon monoxide and hydrogen to produce aldehydes. By hydrogenating the primary aldehydes, alcohols such as n-butanol can be formed. In particular organometallic cobalt or rhodium compounds can be used as hydroformylation catalysts. The hydroformylation is typically carried out at pressures of about 10 bar to 100 bar and temperatures between 40 and 200 ° C. For further details and the running in the hydroformylation chemical reaction steps refer to relevant literature.

The invention also extends to a plant for producing a gas product containing at least carbon monoxide, comprising means adapted to form an electrolysis insert containing at least carbon dioxide and means adapted to use the electrolysis insert to obtain a raw gas containing at least carbon monoxide and carbon dioxide subject to a low-temperature electrolysis, wherein means are provided which are adapted to form the Elektrolyseeinsatz of at least a portion of a carbon dioxide-containing starting mixture using a first carbon dioxide separation and / or the gas product of at least a portion of the raw gas using a second carbon dioxide separation to build. According to the invention, the plant is characterized in that means are provided which comprise a heat pump and which are adapted to dissipate waste heat from the low-temperature electrolysis using the heat pump and at least partially to the first and / or the second carbon dioxide separation and / or to transfer to at least one further method step assigned to the method.

For features and advantages of a corresponding system is expressly made to the above, the method according to the invention and its embodiments explanations. The same applies to a corresponding system, according to an advantageous embodiment of the invention, which is set up to carry out a corresponding method.

The invention will be explained in more detail below with reference to the accompanying drawings, which illustrate preferred embodiments of the present invention.

Brief description of the drawings

Figure 1 illustrates a system according to an embodiment of the invention in a schematic representation. Detailed description of the drawings

FIG. 1 illustrates a plant according to a particularly preferred embodiment of the invention and designated 100 as a whole.

The central component of the system 100 is an arrangement 10 for carrying out a low-pressure co-electrolysis of the type described above. This is fed to a feed stream A which contains at least carbon dioxide and possibly also water. Optionally, separately from the arrangement 10 for carrying out the low-pressure co-electrolysis supplied water is not illustrated separately in Figure 1.

From the arrangement 10 for carrying out the low-pressure co-electrolysis, a raw gas stream B is carried out, which contains in particular carbon monoxide and unreacted carbon dioxide of the feed stream A. The crude gas stream B may in particular also contain hydrogen and water. The crude gas stream B is fed to an arrangement 20 for carbon dioxide separation.

The carbon dioxide separation assembly 20 may be adapted for adsorptive or absorptive carbon dioxide removal, as is well known in the art. In the absorptive removal may be in particular an amine and / or Laugewäsche. The adsorptive removal can be carried out using a suitable adsorbent material. From the arrangement 20 for carbon dioxide separation can in particular a

C product stream are carried out predominantly or exclusively

Carbon monoxide or carbon monoxide and hydrogen may contain. Furthermore, a carbon dioxide-rich stream D can be discharged from the arrangement 20 and returned to the arrangement 10 for carrying out the low-pressure co-electrolysis.

In order to provide the feed stream A, it is possible in particular to use a further device 30 for separating off carbon dioxide, to which is supplied a carbon dioxide-containing output stream E, for example a flue gas stream. The further arrangement 30 for separating off carbon dioxide can likewise be designed for the adsorptive and / or absorptive removal of carbon dioxide. In the arrangement 10 for performing the low-pressure co-electrolysis resulting waste heat, here illustrated with F, can by using a heat pump 40, which can be operated using a suitable working medium in the means 20 for carbon dioxide separation and / or the further means 30 for Carbon dioxide separation are transferred, as illustrated with G and H.

Claims

claims

1 . Process for the preparation of an at least carbon monoxide-containing

A gas product in which an at least carbon dioxide-containing Elektrolyseeinsatz is formed and subjected to a at least carbon monoxide and carbon dioxide-containing raw gas of a low-temperature electrolysis, wherein the electrolysis insert from at least a portion of a carbon dioxide-containing starting mixture using a first

Carbon dioxide separation is formed and / or the gas product is formed from at least a portion of the raw gas using a second carbon dioxide separation, characterized in that waste heat of the low-temperature electrolysis using a heat pump from the low-temperature electrolysis removed and at least partially to the first and / or the second carbon dioxide separation and / or at least one further process step associated with the method is transmitted.

2. The method of claim 1, wherein the first and / or the second

Carbon dioxide separation comprises a laundry in which a washing liquid is loaded with carbon dioxide and regenerated by expelling the carbon dioxide by means of the washing liquid supplied heat of regeneration.

3. The method according to claim 1 or 2, wherein the first and / or the second

Carbon dioxide separation comprises an adsorption in which an adsorbent is loaded with carbon dioxide and regenerated by desorbing the carbon dioxide by means of the adsorbent supplied heat of regeneration.

4. The method of claim 2 or 3, wherein the heat of regeneration comprises at least a portion of the transmitted using the heat pump from the low-temperature electrolysis waste heat.

5. The method of claim 2, wherein the laundry is performed as a chemical and / or as a physical wash.

6. A method according to claim 5, wherein the washing is carried out using one or more compounds selected from inorganic carbonates, Amines, alcohols, one or more organic methyl or ethyl esters, one or more organic methyl or ethyl ethers, polyethylene glycol, acetone, acetonitrile, n-methylpyrrolidone and dimethylformamide are selected and / or in which a Selexol, Genosorb and / or Purisolverfahren is carried out.

7. The method according to any one of the preceding claims, wherein the

Low-temperature electrolysis is carried out at an electrolysis temperature level, wherein the electrolysis temperature level is 20 to 100 ° C.

8. The method of claim 7, wherein the waste heat of the low-temperature electrolysis is transmitted using the heat pump by means of one or more working fluid streams at one or more temperature levels above the electrolysis temperature level.

9. The method of claim 8, wherein a compression heat pump is used, wherein the or the working fluid streams is or are formed using one or more working fluid, which comprises or comprise at least one hydrocarbon and / or at least one alcohol and / or in which a sorption heat pump is used.

The process of claim 9 wherein the hydrocarbon (s) comprises or comprises propane, butane and / or dimethyl ether.

1 1. Method according to one of the preceding claims, in which the one or more

Method assigned further method steps for further processing at least a portion of the gas product is or will be used.

12. The method of claim 1 1, wherein the one or more associated with the method further process steps one or more constituent chemical

Synthesis reactions and / or one or more separation steps downstream of the synthesis reaction (s).

13. The method of claim 12, wherein the one or more constituent chemical synthesis reactions comprise or comprise a hydroformylation and / or a synthesis of at least one further alcohol.

14. Plant (100) for producing a carbon monoxide containing at least

A gas product, comprising means adapted to form an at least carbon dioxide-containing electrolysis insert and means adapted to carry out the use of electrolysis to obtain at least carbon monoxide and

Carbon dioxide-containing raw gas to be subjected to a low-temperature electrolysis, wherein means are provided which are adapted to the

Forming electrolysis insert from at least part of a carbon dioxide-containing starting mixture using a first carbon dioxide separation and / or to form the gas product from at least part of the raw gas using a second carbon dioxide separation, characterized in that means are provided which comprise a heat pump, and adapted to dissipate waste heat from the low-temperature electrolysis using the heat pump and at least partially to the first and / or the second carbon dioxide separation and / or at least one assigned to the method further process step.

15. Plant (100) according to claim 14, which is adapted to carry out a method according to one of claims 1 to 12.