Method for purifying a synthetic crude oil stream

Abstract

The present invention relates to a method for purifying a synthetic crude oil stream (1), said method comprising the following steps: - providing the synthetic crude oil stream (1), the synthetic crude oil stream (1) containing diene compounds and having a diene number of at least 0.1g / 100g; - contacting the synthetic crude oil stream (1) with a sulphur stream (2) containing at least one sulphur compound in order to form a mixture, thereby converting at least some of the diene compounds into diene-free products; and - obtaining therefrom a synthetic crude oil product stream (3), the diene-free products being dissolved in the synthetic crude oil product stream (3). The invention also relates to a method for producing a synthetic crude oil product stream (3) from an organic material.

Description

[0001] Process for purifying a synthetic crude oil stream

[0002] The present invention relates to processes for purifying a synthetic crude oil stream and to processes for producing a synthetic crude oil product stream from an organic material.

[0003] Synthetic crude oil, sometimes also called syncrude, can be obtained from various processes. For example, synthetic crude oil can be shale oil, which is extracted from oil shale by pyrolysis. Another source is hydrocarbons extracted from oil sands, particularly bitumen, which can be upgraded to produce synthetic crude oil. Furthermore, synthetic crude oil can also be produced from plastic materials, such as plastic waste, through cracking.

[0004] Synthetic crude oils typically contain various impurities that can have adverse effects on refining processes and refinery facilities, or even render the crude oil completely unsuitable for certain refining processes. The type and content of the impurities can vary greatly depending on the source and method used to extract the synthetic crude oil.

[0005] A particularly serious problem in the processing of synthetic crude oils is gum formation. Pyrolysis oils typically contain various chemical compounds that can tend to form deposits. Such deposits can subsequently clog or otherwise damage refinery equipment, increase cleaning requirements, and shorten the service life of the equipment.

[0006] The problem of gum formation in connection with synthetic crude oils has not yet been satisfactorily solved. There continues to be a need for methods to reduce the tendency of synthetic crude oils to gum. It is therefore an object of the present invention to provide processes to reduce gum formation in synthetic crude oils.

[0007] The present invention therefore relates to a process for purifying a synthetic crude oil stream, the process comprising the following steps:

[0008] - providing the synthetic crude oil stream, wherein the synthetic crude oil stream contains diene compounds and has a diene number of at least 0.1 g / 100g;

[0009] - contacting the synthetic crude oil stream with a sulfur stream containing at least one sulfur compound to form a mixture, whereby at least a portion of the diene compounds is converted into diene-free products; and

[0010] - obtaining therefrom a synthetic crude oil product stream, wherein the diene-free products are present in dissolved form in the synthetic crude oil product stream.

[0011] In a further aspect, the invention relates to a process for producing a synthetic crude oil product stream from an organic material, preferably plastic material, comprising the following steps:

[0012] - providing the organic material, wherein the organic material comprises diene compounds;

[0013] - adding a sulfur-containing composition containing at least one sulfur compound to form a mixture;

[0014] - feeding the mixture into a depolymerization reactor and depolymerizing the organic material, wherein at least a portion of the diene compounds reacts with the at least one sulfur compound and is converted into diene-free products; and

[0015] - obtaining therefrom a synthetic crude oil product stream, wherein the diene-free products are present in dissolved form in the synthetic crude oil product stream.

[0016] In a further aspect, the invention relates to a process for producing a synthetic crude oil product stream from an organic material, preferably plastic material, comprising the following steps:

[0017] - providing the organic material, wherein the organic material comprises diene compounds and at least one sulfur source;

[0018] - feeding the organic material into a depolymerization reactor and depolymerizing the organic material, wherein a sulfur compound is obtained from the at least one sulfur source and wherein at least a portion of the diene compounds reacts with the sulfur compound and is converted into diene-free products; and - obtaining therefrom a synthetic crude oil product stream, wherein the diene-free products are present in dissolved form in the synthetic crude oil product stream.

[0019] In connection with the present invention, it has been found that synthetic crude oils are particularly prone to gum formation when they have a high content of diene compounds. Reactive dienes can therefore act as gum formers and lead to harmful deposits in refinery plants. For example, dienes can sometimes undergo Diels-Alder reactions, thereby leading to cross-linking between molecules and ultimately to deposits. In addition, dienes can form stable complexes with catalysts in hydrogenation plants. It has therefore proven advantageous within the scope of the invention to reduce the diene content of synthetic crude oils.

[0020] In the process according to the invention, this is achieved in that the synthetic crude oil stream is reacted with a sulfur stream comprising at least one sulfur compound in order to convert the diene compounds into soluble diene-free products. The diene-free products can then be present in dissolved form in the crude oil stream. The reaction products therefore do not have to be removed before further processing, for example in a hydrogenation plant. The present invention therefore makes it possible, to put it simply, to render problematic diene compounds at least partially harmless in a single step, without the need for further purification steps to remove the diene compounds or reaction products thereof. Instead, the diene-free products can simply remain in the synthetic crude oil product stream. The synthetic crude oil product stream has a lower diene content and is therefore subsequently less prone to gum formation.The "synthetic crude oil product stream" may also be referred to as the "refined synthetic crude oil stream".

[0021] The use of sulfur-containing compounds to remove olefins from hydrocarbon products is generally known from the prior art. For example, WO 2021 / 021449 A1 describes processes for removing olefins from light hydrocarbon streams by mercaptanization with hydrogen sulfide in the presence of a catalyst. This involves converting olefins into mercaptans, which are then oxidized in a so-called MEROX process step and finally separated. However, WO 2021 / 021449 A1 does not refer to the treatment of synthetic crude oils or to diene compounds, which are particularly problematic in connection with gum formation.

[0022] The present invention is also based on a completely different approach. It has been found that diene compounds present in a synthetic crude oil stream can be converted directly into diene-free products by reaction with sulfur compounds. These products are soluble in the synthetic crude oil stream and can remain there. Thus, it is even possible to directly process the resulting synthetic crude oil product stream, for example, in a hydrogenation plant, without the need for additional purification or separation steps.

[0023] Further processes related to the processing or purification of crude oil streams, in particular the conversion of diene compounds, or related topics, are known from WO 2021 / 204818 A1, WO 2021 / 201932 A1, US 4,059,504 A, US 3,238,269 A, US 3,595,780 A, US 5,417,844 A, and US 4,734,540 A. The hydrogenation of diene compounds is particularly known from the prior art. Diene compounds are typically reduced with hydrogen (H2) in the presence of a catalyst.

[0024] As described above, the present invention pursues a different approach. In the context of the invention, contacting the synthetic crude oil stream with the sulfur stream preferably takes place in the absence of hydrogen (H2). In particular, it is preferred in all aspects of the invention that the sulfur compound enters into addition reactions with double bonds of the diene compounds, thereby converting at least a portion of the diene compounds into diene-free products.

[0025] In the process according to the invention for producing a synthetic crude oil product stream from an organic material, sulfur compounds are added to the organic material prior to depolymerization, or a sulfur source is already present in the organic material. This makes it possible to convert diene compounds into diene-free products during pyrolysis, which are present in dissolved form in the resulting synthetic crude oil product stream. This has the advantage, among other things, that the high temperatures during depolymerization can also be used for the conversion of the diene compounds, and that no subsequent separate addition of sulfur compounds is required.

[0026] It is particularly advantageous if the organic material already contains a sulfur source. In this case, the sulfur compound can be released by the high temperatures during depolymerization. Therefore, selecting or combining an organic material that already contains a sulfur source in addition to the diene compounds has the advantage that no separate addition of a sulfur-containing compound is required.

[0027] The sulfur source can be any substance from which a sulfur compound as defined herein, such as a thiol or hydrogen sulfide, can be obtained during depolymerization. In one embodiment, the sulfur source can be elemental sulfur. In a preferred embodiment, the sulfur source is sulfur-containing polymers, preferably vulcanized plastics. Under the conditions of depolymerization, such sulfur sources can produce, among other things, hydrogen sulfide but also mercaptans, which can subsequently react with the diene compounds contained in the organic material, as described herein.

[0028] In a preferred embodiment, the concentration of the sulfur source (preferably the sulfur-containing polymers, in particular the vulcanized plastics) in the organic material is at least 0.05 wt.%, more preferably at least 0.1 wt.%, more preferably at least 0.2 wt.%, more preferably at least 0.5 wt.%, more preferably at least 1 wt.%, more preferably at least 2 wt.%, more preferably at least 5 wt.%, more preferably at least 10 wt.%. Preferably, the concentration is from 0.05 to 60 wt.%, more preferably from 0.1 to 50 wt.%, more preferably from 0.2 to 40 wt.%, more preferably from 0.5 to 35 wt.%, more preferably from 1 to 30 wt.%, more preferably from 2 to 25 wt.%, more preferably from 5 to 20 wt.%, more preferably from 10 to 15 wt.%.Higher concentrations of the sulfur source have the advantage that a larger amount of sulfur compounds is obtained during depolymerization and that the reaction with the diene compounds is therefore further favored.

[0029] Preferred embodiments of the process according to the invention for purifying a synthetic crude oil stream and the process according to the invention for producing a synthetic crude oil product stream from an organic material are described jointly below. Thus, preferred embodiments described with reference to one process, for example, for the diene content or for the sulfur compounds, also apply to the other processes.

[0030] The diene compounds present in the synthetic crude oil stream or in the organic material are preferably compounds containing conjugated or cumulative carbon-carbon double bonds, especially conjugated carbon-carbon double bonds. Such compounds are particularly prone to gum formation, for example, through Diels-Alder reactions, and can be removed particularly effectively using the process according to the invention.

[0031] The person skilled in the art is familiar with methods for determining the diene number. The diene number is preferably determined according to ASTM UOP326-07.

[0032] The synthetic crude oil stream has a diene number of at least 0.1 g / 100g, preferably at least 0.2 g / 100g, more preferably at least 0.3 g / 100g, more preferably at least 0.4 g / 100g, more preferably at least 0.5 g / 100g, more preferably at least 0.6 g / 100g, more preferably at least 0.7 g / 100g, more preferably at least 0.8 g / 100g, more preferably at least 0.9 g / 100g, more preferably at least 1.0 g / 100g, more preferably at least 1.1 g / 100g, more preferably at least 1.2 g / 100g, more preferably at least 1.3 g / 100g, more preferably at least 1.4 g / 100g, more preferably at least 1.5 g / 100g, more preferably at least 1.6 g / 100g, more preferably at least 1.7 g / 100g, more preferably at least 1.8 g / 100g, more preferably at least 1.9 g / 100g, more preferably at least 2.0 g / 100g. Preferably, the synthetic crude oil stream orthe organic material has a diene number in the range from 0.1 g / 100 g to 15 g / 100 g, more preferably from 1.0 g / 100 g to 12 g / 100 g, in particular from 1.5 g / 100 g to 10 g / 100 g. With regard to the process according to the invention for producing a synthetic crude oil product stream from an organic material, it is likewise preferred if the organic material has a diene number of at least 0.1 g / 100 g. It is particularly preferred if the organic material has a diene number as described here for the synthetic crude oil stream, ie the preferred values ​​described as being preferred for the synthetic crude oil stream also apply to the organic material.

[0033] The synthetic crude oil product stream preferably has a lower diene number than the synthetic crude oil stream or the organic material. Preferably, the synthetic crude oil product stream has a diene number of less than 5 g / 100 g, more preferably less than 4 g / 100 g, more preferably less than 3 g / 100 g, more preferably less than 2 g / 100 g, more preferably less than 1.5 g / 100 g, more preferably less than 1 g / 100 g, more preferably less than 0.9 g / 100 g, more preferably less than 0.8 g / 100 g, more preferably less than 0.7 g / 100 g, more preferably less than 0.6 g / 100 g, more preferably less than 0.5 g / 100 g. Preferably, the synthetic crude oil product stream has a diene number in the range from 0.01 g / 100g to 5 g / 100g, more preferably from 0.1 g / 100g to 2 g / 100g, in particular from 0.2 g / 100g to 1 g / 100g.

[0034] The at least one sulfur compound is preferably selected from the group consisting of thiols, thioketones, thioethers, thiocarboxylic acids, mercaptocarboxylic acids, and hydrogen sulfide. Thiols are particularly preferred. Thiols can react with dienes in an addition reaction to form thioethers, which can remain dissolved in the synthetic crude oil stream. The diene is thus removed and can no longer, for example, undergo Diels-Alder reactions, which could lead to gum formation. In a similar manner, the other sulfur compounds mentioned can also react with dienes to form soluble, diene-free and less reactive products. Hydrogen sulfide is also suitable as a sulfur compound in the process according to the invention.However, hydrogen sulfide has the disadvantage that the addition reaction with a diene produces a free thiol, which can itself react further and thus contribute to a certain extent to the cross-linking of molecules and the formation of deposits. Thiols, thioketones, thioethers, thiocarboxylic acids, and mercaptocarboxylic acids have therefore proven particularly advantageous.

[0035] It is particularly preferred if the at least one sulfur compound is selected from the group consisting of methyl mercaptan, ethyl mercaptan, n-propyl mercaptan, isopropyl mercaptan, phenyl mercaptan, ethanedithiol, propanedithiol, mercaptoethanol, mercaptopropanol, thioacetic acid, mercaptoacetic acid, cysteine, methionine, thiourea and hydrogen sulfide. For the reasons stated above, hydrogen sulfide is less preferred among the compounds mentioned. The other compounds mentioned, however, all have the advantage that no free thiols, which can enter into further undesirable reactions, are formed during the reaction with dienes.In connection with the invention, it is therefore particularly preferred if the at least one sulfur compound is selected from the group consisting of methyl mercaptan, ethyl mercaptan, n-propyl mercaptan, isopropyl mercaptan, phenyl mercaptan, ethanedithiol, propanedithiol, mercaptoethanol, mercaptopropanol, thioacetic acid, mercaptoacetic acid, cysteine, methionine and thiourea.

[0036] It has proven advantageous if the synthetic crude oil stream is brought into contact with the sulfur stream at a temperature of at least 80 ° C, preferably at least 100 ° C, more preferably at least 120 ° C, more preferably at least 140 ° C, more preferably at least 160 ° C, more preferably at least 180 ° C, more preferably at least 200 ° C, more preferably at least 220 ° C, more preferably at least 240 ° C. In particular, it is preferred if the synthetic crude oil stream is brought into contact with the sulfur stream at a temperature in the range from 80 to 450 ° C, preferably from 100 to 400 ° C, more preferably from 120 to 350 ° C, more preferably from 140 to 300 ° C, more preferably from 160 to 260 ° C, more preferably from 180 to 220 ° C. A higher temperature may favor the reaction between the diene compounds and the sulfur compounds and therefore lead to an even greater reduction in the diene content.

[0037] Preferably, the synthetic crude oil stream is contacted with the sulfur stream at the stated temperature for a duration of at least 0.5 minutes, preferably at least 1 minute, more preferably at least 2 minutes, even more preferably at least 5 minutes, most preferably at least 12 minutes. Providing a longer duration enables the reactions between the diene compounds and the sulfur compounds to proceed more completely, so that the diene content can be reduced even further. In particular, it is therefore preferred if the duration is between 0.5 and 180 minutes, preferably between 1 and 120 minutes, more preferably between 2 and 60 minutes, even more preferably between 5 and 30 minutes, most preferably between 12 and 20 minutes.

[0038] In a preferred embodiment, the contacting takes place in the presence of at least one radical initiator and / or catalyst. The presence of a radical initiator and / or a catalyst can promote the addition of sulfur compounds to double bonds and thus lead to an even more thorough removal of diene compounds. In particular, a radical initiator and / or a catalyst has the advantage that a lower activation energy has to be applied and that the reactions of the diene compounds therefore also proceed quickly if the contacting of the synthetic crude oil stream with the sulfur stream takes place at lower temperatures. Preferably, the at least one radical initiator and / or catalyst is selected from the group consisting of UV light, azobis(isobutyronitrile), dibenzoyl peroxide, amine compounds and heavy metal salts.

[0039] Preferably, the concentration of sulfur compounds in the sulfur stream is at least 0.01 wt.%, more preferably at least 0.5 wt.%, more preferably at least 2 wt.%, more preferably at least 10 wt.%. A higher concentration of sulfur compounds can favor the reaction with diene compounds.

[0040] It is further preferred if the concentration of the sulfur compounds in the mixture formed from the synthetic crude oil stream and the sulfur stream is at least 0.05 wt.%, preferably at least 0.1 wt.%, more preferably at least 1 wt.%. In particular, it is preferred if the concentration of the sulfur compounds in the mixture formed from the synthetic crude oil stream and the sulfur stream is in the range from 0.05 to 10 wt.%, preferably from 0.1 to 5 wt.%, more preferably from 0.2 to 2 wt.%.

[0041] In a preferred embodiment, the volumetric mixing ratio between the synthetic crude oil stream and the sulfur stream is from 1000:1 to 10:1, preferably from 200:1 to 50:1. A mixing ratio in this range has proven particularly suitable because it can ensure a sufficient concentration of sulfur compounds without excessively diluting the synthetic crude oil stream.

[0042] In a preferred embodiment of the process according to the invention for purifying a synthetic crude oil stream or for producing a synthetic crude oil stream from an organic material, the synthetic crude oil product stream is fed to a liquid-gas separation. Preferably, at least a portion of unused sulfur compounds is separated off via the gas phase. This has the advantage, among other things, that the sulfur content in the synthetic crude oil product stream is reduced, even when large amounts of sulfur compounds are used. It is particularly advantageous if at least a portion of the sulfur compounds separated off via the gas phase is recycled to the sulfur stream. This allows even better utilization of the sulfur compounds. In addition, this enables a higher concentration of sulfur compounds in the mixture of synthetic crude oil stream and sulfur stream, which in turn promotes the reaction of the diene compounds.

[0043] In a preferred embodiment of the process according to the invention for purifying a synthetic crude oil stream or for producing a synthetic crude oil stream from an organic material, the synthetic crude oil product stream is fed to a hydrogenation plant. It has been found that reducing the diene content in the synthetic crude oil stream is particularly advantageous, particularly during hydrogenation in a hydrogenation plant, since dienes can form stable complexes with catalysts in such plants. The use of the process according to the invention in combination with hydrogenation can thus significantly improve the service life of the hydrogenation plants and in particular of the catalysts used.

[0044] In the context of the invention, a "synthetic crude oil stream" is preferably understood to mean a material stream comprising a synthetic crude oil or a fraction of a synthetic crude oil. The synthetic crude oil stream preferably consists of synthetic crude oil or a fraction thereof. Within the scope of the invention, it is particularly preferred if the synthetic crude oil stream comprises, in particular consists of, a pyrolysis oil or a fraction thereof. The pyrolysis oil is preferably a pyrolysis oil obtained from biomass, in particular wood, and / or plastic. The process according to the invention has proven particularly suitable if the synthetic crude oil stream is a hydrocarbon mixture obtained from the depolymerization of biomass or plastic material, in particular plastic material.The synthetic crude oil stream is therefore preferably a plastic pyrolysate or a fraction thereof, or a biomass, in particular wood, pyrolysate or a fraction thereof. However, the process according to the invention is also well suited for other synthetic crude oils and fractions thereof. In further preferred embodiments, the synthetic crude oil stream therefore comprises shale oil or upgraded bitumen, preferably consisting thereof.

[0045] In a particularly preferred embodiment of the process for purifying a synthetic crude oil stream, the synthetic crude oil stream is therefore produced by depolymerizing plastic material, in particular plastic waste. Those skilled in the art are familiar with the production of a synthetic crude oil stream by depolymerizing plastic material. Such processes are known, for example, from WO 2012 / 149590 A1 and US Pat. No. 6,060,631 A. Likewise, for the process for producing a synthetic crude oil product stream from an organic material, it is preferred if the organic material is plastic material, in particular plastic waste.

[0046] The plastic material preferably comprises polyethylene (PE), polypropylene (PP), polystyrene (PS), polyvinyl chloride (PVC), polyethylene terephthalate (PET), polyamide (PA), styrene-acrylonitrile (SAN), and / or acrylonitrile-butadiene-styrene (ABS). The processes according to the invention have proven particularly suitable for purifying pyrolysis oils from the aforementioned plastic materials.

[0047] In a preferred embodiment of the process for producing a synthetic crude oil product stream from an organic material, the depolymerization of the organic material takes place at a temperature of at least 250 °C, preferably at least 300 °C, more preferably at least 350 °C. Preferably, the depolymerization of the organic material takes place at a temperature in the range from 250 to 550 °C, preferably from 300 to 500 °C, more preferably from 350 to 450 °C, more preferably from 400 to 440 °C. It has been found that these temperatures are well suited both for depolymerizing the organic material, in particular plastic material, and at the same time promote the reaction of the dienes with sulfur compounds.

[0048] Unless otherwise indicated, all parameters mentioned herein refer to SATP conditions according to IUPAC ("Standard Ambient Temperature and Pressure"), in particular to a temperature of 25 °C and a pressure of 101,300 Pa.

[0049] All percentages (%) herein refer to percentages by weight unless otherwise indicated.

[0050] Unless otherwise indicated, all mixing ratios given herein refer to volumetric mixing ratios, i.e. volume ratios (volume : volume).

[0051] The present invention is illustrated by the following figure, to which it is of course not limited.

[0052] Figure 1 shows a process flow diagram of a preferred embodiment of the process according to the invention for purifying a synthetic crude oil stream.

[0053] In the embodiment shown in Figure 1, the synthetic crude oil stream 1 is obtained by depolymerizing plastic material. The plastic material is compacted, degassed, and melted in an extruder 12. The plastic melt emerging from the extruder 12 is mixed in a static mixer 13 with an external solvent 14, preferably heavy oil, and / or with already cracked plastic material, which is recycled as a recycling stream 15, in order to reduce the viscosity of the plastic melt. The resulting mixture is introduced into a depolymerization reactor 16, in which the plastic material is depolymerized, preferably at a temperature between 400°C and 440°C. Cracked plastic material is obtained as the overhead product of a column 17.After separation of a gas stream 18 in a further column 19, the synthetic crude oil stream 1 is obtained, wherein the synthetic crude oil stream 1 has a diene number of at least 0.1 g / 100 g. The synthetic crude oil stream 1 is then brought into contact with a sulfur stream 2 comprising at least one sulfur compound, preferably a thiol. At least some of the diene compounds present in the synthetic crude oil stream 1 react with the sulfur compounds and are converted to diene-free products. This gives a synthetic crude oil product stream 3 in which the diene-free products are present in dissolved form.

Claims

Patent claims:

1. A process for purifying a synthetic crude oil stream (1), the process comprising the following steps: - providing the synthetic crude oil stream (1), wherein the synthetic crude oil stream (1) contains diene compounds and has a diene number of at least 0.1 g / 100 g; - contacting the synthetic crude oil stream (1) with a sulfur stream (2) containing at least one sulfur compound to form a mixture, whereby at least a portion of the diene compounds is converted into diene-free products; and - obtaining therefrom a synthetic crude oil product stream (3), wherein the diene-free products are present in dissolved form in the synthetic crude oil product stream (3).

2. The process according to claim 1, wherein the contacting of the synthetic crude oil stream (1) with the sulfur stream (2) takes place at a temperature of at least 80 °C.

3. The process according to claim 1 or 2, wherein the contacting takes place in the presence of at least one radical initiator and / or catalyst, preferably wherein the at least one radical initiator and / or catalyst is selected from the group consisting of UV light, azobis(isobutyronitrile), dibenzoyl peroxide, amine compounds and heavy metal salts.

4. The process according to any one of claims 1 to 3, wherein the concentration of the sulfur compounds in the mixture formed from the synthetic crude oil stream (1) and the sulfur stream (2) is at least 0.05 wt.%.

5. The process according to any one of claims 1 to 4, wherein the concentration of the sulfur compounds in the mixture formed from the synthetic crude oil stream (1) and the sulfur stream (2) is in the range of 0.05 to 10 wt.%.

6. The process according to any one of claims 1 to 5, wherein the volumetric mixing ratio between the synthetic crude oil stream (1) and the sulfur stream (2) is from 1000:1 to 10:

1.

1. The process according to any one of claims 1 to 6, wherein the synthetic crude oil stream (1) is produced by depolymerization of plastic material, in particular plastic waste.

8. A process for producing a synthetic crude oil product stream (3) from an organic material, preferably plastic material, comprising the following steps: - providing the organic material, wherein the organic material comprises diene compounds; - adding a sulfur-containing composition containing at least one sulfur compound to form a mixture; - feeding the mixture into a depolymerization reactor (16) and depolymerizing the organic material, wherein at least a portion of the diene compounds reacts with the at least one sulfur compound and is converted into diene-free products; and - obtaining therefrom a synthetic crude oil product stream (3), wherein the diene-free products are present in dissolved form in the synthetic crude oil product stream (3).

9. A process for producing a synthetic crude oil product stream (3) from an organic material, preferably plastic material, comprising the following steps: - providing the organic material, wherein the organic material comprises diene compounds and at least one sulfur source; - feeding the organic material into a depolymerization reactor (16) and depolymerizing the organic material, wherein a sulfur compound is obtained from the at least one sulfur source and wherein at least a portion of the diene compounds reacts with the sulfur compound and is converted into diene-free products; and - obtaining therefrom a synthetic crude oil product stream (3), wherein the diene-free products are present in dissolved form in the synthetic crude oil product stream (3).

10. The process according to any one of claims 1 to 9, wherein the at least one sulfur compound is selected from the group consisting of thiols, thioketones, thioethers, Thiocarboxylic acids, mercaptocarboxylic acids, and hydrogen sulfide.

11. The method according to any one of claims 1 to 10, wherein the at least one sulfur compound is selected from the group consisting of methyl mercaptan, ethyl mercaptan, n-propyl mercaptan, iso-propyl mercaptan, phenyl mercaptan, ethanedithiol, propanedithiol, mercaptoethanol, mercaptopropanol, thioacetic acid, mercaptoacetic acid, cysteine, methionine and thiourea.

12. The method according to one of claims 1 to 11, wherein the plastic material comprises polyethylene (PE), polypropylene (PP), polystyrene (PS), polyvinyl chloride (PVC), polyethylene terephthalate (PET), polyamide (PA), styrene-acrylonitrile (SAN) and / or acrylonitrile-butadiene-styrene (ABS).

13. The process according to any one of claims 8 to 12, wherein the depolymerization of the organic material takes place at a temperature of at least 250°C.

14. The process according to any one of claims 8 to 13, wherein the depolymerization of the organic material takes place at a temperature in the range of 250 to 550 °C.

15. The process according to any one of claims 1 to 14, wherein the synthetic crude oil product stream (3) containing the diene-free products is fed to a hydrogenation plant.

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