Two-stage hydrogenation reaction system for C9 hydrogenated petroleum resin

Abstract

The utility model discloses a C9 hydrogenated petroleum resin two-stage hydrogenation reaction system, particularly relates to the technical field of petroleum resin, and comprises a two-stage hydrogenation reactor, a first-stage catalyst bed layer, a second-stage catalyst bed layer and a third-stage catalyst bed layer are arranged in the two-stage hydrogenation reactor, the top end of the second-stage hydrogenation reactor is connected with a first-stage hydrogenation product feeding pipeline, the top end of the second-stage hydrogenation reactor is also connected with a new hydrogen pipeline, the new hydrogen pipeline is connected with a circulating hydrogen pipeline, and the new hydrogen pipeline and the circulating hydrogen pipeline are connected and converged and then are divided into four paths; the bottom of the second-stage hydrogenation reactor is connected with a second-stage hydrogenation product pipeline, and the second-stage hydrogenation product pipeline is connected with a solvent oil injection pipeline. According to the utility model, hydrogen is recycled, so that the addition amount of new hydrogen is reduced, and a first-stage hydrogenation reaction product cooler is saved, thereby reducing the one-time investment cost and the later operation cost of the system.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum resins, and more specifically to a two-stage hydrogenation reaction system for carbon nine hydrogenated petroleum resins. Background Art

[0002] C9 petroleum resin is a polymer made by catalytic low-temperature copolymerization or free radical high-temperature copolymerization under certain conditions using C9 fraction as raw material. It is a light yellow to gray-brown functional resin, viscous liquid or solid, with a softening point between 120℃ and 150℃, and a relative molecular weight generally between 200 and 2000. C9 petroleum resin does not contain polar groups in its molecular structure, and has good compatibility in hydrocarbon solvents. It also has excellent water resistance, acid and alkali resistance, weather resistance, tackification, brittleness, plasticity and other advantages. C9 resin is widely used in adhesives, hot melt adhesives, inks, coatings, rubber and other industries.

[0003] The existing domestic C9 petroleum resins are dark in color and low in quality, and are mainly used as rubber reinforcing agents and concrete additives. With the development of the domestic adhesive market and the intensified competition in the traditional petroleum resin industry, manufacturers are gradually turning their attention to hydrogenated petroleum resins, which are more expensive and more profitable.

[0004] Therefore, a two-stage hydrogenation reaction system for carbon nine hydrogenated petroleum resin is proposed. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the utility model provides a two-stage hydrogenation reaction system for carbon nine hydrogenated petroleum resin, which adopts hydrogen recycling, reduces the amount of new hydrogen added, saves a first-stage hydrogenation reaction product cooler, thereby reducing the system's one-time investment cost and subsequent operating costs to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a two-stage hydrogenation reaction system for carbon nine hydrogenated petroleum resin, comprising a two-stage hydrogenation reactor, wherein a first-stage catalyst bed, a second-stage catalyst bed and a third-stage catalyst bed are arranged in the two-stage hydrogenation reactor, a first-stage hydrogenation product feed pipeline is connected to the top of the two-stage hydrogenation reactor, a new hydrogen pipeline is also connected to the top of the two-stage hydrogenation reactor, the new hydrogen pipeline is connected to a circulating hydrogen pipeline, the new hydrogen pipeline and the circulating hydrogen pipeline are connected and merged to form four routes, the first route is connected to an upper hydrogenation pipeline, the upper hydrogenation pipeline is connected to the top of the two-stage hydrogenation reactor, and the other three routes are respectively connected to the corresponding bottoms of the first-stage catalyst bed, the second-stage catalyst bed and the third-stage catalyst bed, the bottom of the two-stage hydrogenation reactor is connected to a two-stage hydrogenation product pipeline, and the two-stage hydrogenation product pipeline is connected to a solvent oil injection pipeline.

[0007] Preferably, the new hydrogen pipeline and the circulating hydrogen pipeline are connected and merged to form four pipelines, namely, a first pipeline, a second pipeline, a third pipeline and a fourth pipeline;

[0008] The first pipeline is connected to the second stage hydrogenation reactor after being connected to the upper hydrogenation pipeline and the first stage hydrogenation product feed pipeline;

[0009] The second pipeline is connected to a middle-upper hydrogenation pipeline, and one end of the middle-upper hydrogenation pipeline is connected between the first stage catalyst bed and the second stage catalyst bed;

[0010] The third pipeline is connected to a middle and lower hydrogenation pipeline, and one end of the middle and lower hydrogenation pipeline is connected between the second stage catalyst bed and the third stage catalyst bed;

[0011] The fourth pipeline is connected to a lower hydrogenation pipeline, and the lower hydrogenation pipeline is connected to one side of the bottom of the third stage catalyst bed.

[0012] Preferably, the second-stage hydrogenation reactor is a fixed bed reactor using a supported metal catalyst.

[0013] Preferably, after the new hydrogen pipeline and the circulating hydrogen pipeline are connected, the first of the four pipelines is connected to the first-stage hydrogenation product feed pipeline, and the connected pipelines are connected to the top of the second-stage hydrogenation reactor.

[0014] Preferably, the solvent oil injection pipeline is connected to the second-stage hydrogenation product pipeline at the bottom end of the second-stage hydrogenation reactor.

[0015] Beneficial effects of the utility model:

[0016] The utility model divides the two-stage hydrogenation reactor into three sections, introduces circulating hydrogen with a lower temperature at the reactor hydrogenation material inlet, between the three-stage catalyst bed sections, and at the third-stage catalyst outlet, so that the circulating hydrogen is mixed with the hydrogenation material in sections to control the reaction rate. At the same time, the reaction heat between the catalyst sections can be removed in time to control the reaction temperature, and the hydrogenation and decolorization reaction is controllable as a whole, which prolongs the service life of the catalyst and ensures the product quality. The recycling of hydrogen reduces the amount of new hydrogen added, eliminates the need for a hydrogenation product cooler, and reduces the system's one-time investment cost and later operating cost. The hydrogenated carbon nine petroleum resin has the advantages of low chroma, no odor, high adhesion, high stability, good compatibility, etc. It is widely used in high-end environmental protection and sanitation industries. Its price is 1.5 to 2.0 times that of ordinary carbon nine petroleum resin, and its application value is significantly improved, creating higher economic value, thus having good economic benefits and industrial application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0018] The accompanying drawings are marked as follows: 1. new hydrogen pipeline; 2. circulating hydrogen pipeline; 3. upper hydrogenation pipeline; 4. middle-upper hydrogenation pipeline; 5. middle-lower hydrogenation pipeline; 6. lower hydrogenation pipeline; 7. first-stage hydrogenation product feed pipeline; 8. solvent oil injection pipeline; 9. second-stage hydrogenation product pipeline; 10. second-stage hydrogenation reactor; 11. first-stage catalyst bed; 12. second-stage catalyst bed; 13. third-stage catalyst bed. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] Embodiment 1

[0021] As attached Figure 1 The two-stage hydrogenation reaction system of a carbon nine hydrogenated petroleum resin shown in the figure mainly includes a two-stage hydrogenation reactor 10. The catalyst bed of the two-stage hydrogenation reactor 10 is divided into three sections: a first-stage catalyst bed 11, a second-stage catalyst bed 12, and a third-stage catalyst bed 13. The direction of the hydrogenated material is "up in and down out". The first-stage hydrogenation product is injected from the upper part of the two-stage hydrogenation reactor 10 through a first-stage hydrogenation product feed pipeline 7; the new hydrogen in the new hydrogen pipeline 1 and the circulating hydrogen in the circulating hydrogen pipeline 2 are divided into four routes after merging. The first route of circulating hydrogen is merged with the first-stage hydrogenation product at the inlet of the two-stage hydrogenation reactor 10 through the upper hydrogenation pipeline 3, and the second route of circulating hydrogen is injected from the first-stage catalyst bed through the middle-upper hydrogenation pipeline 4. The second stage hydrogenation reactor 10 is injected between the second stage catalyst bed 11 and the second stage catalyst bed 12, the third circulating hydrogen is injected into the second stage hydrogenation reactor 10 from between the second stage catalyst bed 12 and the third stage catalyst bed 13 through the middle and lower hydrogenation pipeline 5, and the fourth circulating hydrogen is injected into the second stage hydrogenation reactor 10 from behind the third stage catalyst bed 13 through the lower hydrogenation pipeline 6; the second stage hydrogenation product is sent to the subsequent processing system from the bottom of the second stage hydrogenation reactor 10 through the second stage hydrogenation product pipeline 9; the solvent oil is merged with the second stage hydrogenation product pipeline 9 at the bottom of the second stage hydrogenation reactor 10 through the solvent oil injection pipeline 8.

[0022] In specific implementation, the first-stage hydrogenation product in the first-stage hydrogenation reactor is mixed with the new hydrogen in the new hydrogen pipeline 1 and the circulating hydrogen in the circulating hydrogen pipeline 2 through the first-stage hydrogenation product feed pipeline 7 and then enters from the upper part of the second-stage hydrogenation reactor 10, the first-stage hydrogenation product has an operating temperature of 220-240° C. and an operating pressure of 13.0-15.0 MPaG; the circulating hydrogen has an operating temperature of 40° C.-60° C. and an operating pressure of 14.0-15.0 MPaG; the temperature of the first-stage hydrogenation product after mixing is controlled at 220-240° C. and the pressure is controlled at 14.0-15.0 MPaG;

[0023] The second-stage hydrogenation decolorization reaction is an exothermic reaction. The temperature of the hydrogenated material increases after passing through the first-stage catalyst bed. Circulating hydrogen at 40°C to 60°C is added between the first-stage catalyst bed and the second-stage catalyst bed to reduce the temperature of the hydrogenated material to 230-250°C. Similarly, circulating hydrogen at 40°C to 60°C is added between the second-stage catalyst bed and the third-stage catalyst bed and after the third-stage catalyst bed, and solvent oil at 30°C to 45°C is added to the second-stage hydrogenation product pipeline at the bottom of the second-stage reactor. The temperature of the second-stage hydrogenation product is controlled at 230-250°C before entering the subsequent process stage.

[0024] It can be seen that by dividing the two-stage hydrogenation reactor 10 into three sections, circulating hydrogen with a lower temperature is introduced into the reactor hydrogenation material inlet, between the three-stage catalyst bed sections, and at the third-stage catalyst outlet, so that the circulating hydrogen is mixed with the hydrogenation material in sections, thereby controlling the reaction rate.

[0025] Embodiment 2

[0026] The second-stage hydrogenation reactor 10 is a fixed bed reactor, which uses a loaded metal catalyst for the purpose of decolorizing carbon nine petroleum resin. The hydrogenation reaction is an exothermic reaction. In order to remove the reaction heat in time, the catalyst bed is divided into three sections, and cooling circulating hydrogen and solvent oil are respectively introduced into the reactor inlet, between catalyst sections, and the reactor outlet.

[0027] The staged addition of circulating hydrogen to the second-stage hydrogenation reactor 10 has two functions. One function is to timely withdraw the reaction heat between reactor stages; the other function is to mix the hydrogenated oil and hydrogen in stages to avoid uneven mixing and local generation of a large amount of reaction heat, which affects the product quality and the stability of the reaction system.

[0028] In the specific implementation, the second-stage hydrogenation reactor 10 uses a hydrogenation decolorization catalyst, which is a supported metal catalyst, the carrier is a metal oxide, the effective component content is 45% to 60%, the catalyst bed is divided into three sections, the hydrogen partial pressure is controlled at 14.0 to 15.0 MPaG, the hydrogen-oil volume ratio is 400 to 600:1, and the volume space velocity is controlled at 1.5 to 2.0 h-1;

[0029] After the second stage hydrogenation decolorization, the color of the first stage hydrogenation product can be reduced from 8 to 0, the product is improved from light yellow to gray brown to water white, and the relative molecular weight range is reduced from the original 200-2000 to 1000-1500, thereby increasing the product stability.

[0030] It can be seen that the addition of circulating hydrogen between catalyst bed sections can timely remove the reaction heat between catalyst sections, control the reaction temperature, and make the hydrogenation and decolorization reaction controllable as a whole, thereby extending the service life of the catalyst and ensuring product quality.

[0031] Embodiment 3

[0032] The second-stage hydrogenation reactor 10 uses circulating hydrogen mixed with new hydrogen and circulating hydrogen to recycle hydrogen, which not only reduces the amount of new hydrogen added, but also reduces the temperature of the first-stage hydrogenation product, eliminates the first-stage hydrogenation product inlet cooler, reduces the initial investment cost and operating cost of the device, and achieves energy saving and consumption reduction.

[0033] During specific implementation, both the circulating hydrogen and the new hydrogen come from the compressor, and the compressor outlet pressure is controlled at 14.0-15.0 MPaG, which matches the operating conditions of the first-stage hydrogenation product and the second-stage hydrogenation reactor. While ensuring the smooth injection of the circulating hydrogen, pulses will not be generated due to excessive pressure difference between hydrogen and hydrogenation materials, thereby avoiding damage to the continuous steady-state reaction system of the second-stage hydrogenation reactor.

[0034] It can be seen that the recycling of hydrogen reduces the amount of new hydrogen added, saves a hydrogenation product cooler, and reduces the system's initial investment cost and subsequent operating costs.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A two-stage hydrogenation reaction system for a carbon nine hydrogenated petroleum resin, comprising a two-stage hydrogenation reactor (10), characterized in that: The second-stage hydrogenation reactor (10) is provided with a first-stage catalyst bed (11), a second-stage catalyst bed (12) and a third-stage catalyst bed (13). The top of the second-stage hydrogenation reactor (10) is connected to a first-stage hydrogenation product feed pipeline (7). The top of the second-stage hydrogenation reactor (10) is also connected to a new hydrogen pipeline (1). The new hydrogen pipeline (1) is connected to a circulating hydrogen pipeline (2). After the new hydrogen pipeline (1) and the circulating hydrogen pipeline (2) are connected and merged, The method is divided into four routes, the first route is connected to an upper hydrogenation pipeline (3), the upper hydrogenation pipeline (3) is connected to the top of a second-stage hydrogenation reactor (10), and the other three routes are respectively connected to the bottom of a corresponding first-stage catalyst bed (11), a second-stage catalyst bed (12) and a third-stage catalyst bed (13). The bottom of the second-stage hydrogenation reactor (10) is connected to a second-stage hydrogenation product pipeline (9), and the second-stage hydrogenation product pipeline (9) is connected to a solvent oil injection pipeline (8).

2. A two-stage hydrogenation reaction system for a carbon nine hydrogenated petroleum resin according to claim 1, characterized in that: The new hydrogen pipeline (1) and the circulating hydrogen pipeline (2) are connected and merged to form four pipelines, namely a first pipeline, a second pipeline, a third pipeline and a fourth pipeline; The first pipeline is connected to the second-stage hydrogenation reactor (10) after being connected to the upper hydrogenation pipeline (3) and the first-stage hydrogenation product feed pipeline (7); The second pipeline is connected to a middle-upper hydrogenation pipeline (4), and one end of the middle-upper hydrogenation pipeline (4) is connected between the first-stage catalyst bed (11) and the second-stage catalyst bed (12); The third pipeline is connected to a middle and lower hydrogenation pipeline (5), and one end of the middle and lower hydrogenation pipeline (5) is connected between the second stage catalyst bed (12) and the third stage catalyst bed (13); The fourth pipeline is connected to a lower hydrogenation pipeline (6), and the lower hydrogenation pipeline (6) is connected to one side of the bottom of the third stage catalyst bed (13).

3. A two-stage hydrogenation reaction system for a carbon nine hydrogenated petroleum resin according to claim 2, characterized in that: The second-stage hydrogenation reactor (10) is a fixed bed reactor using a supported metal catalyst.

4. A two-stage hydrogenation reaction system for a carbon nine hydrogenated petroleum resin according to claim 3, characterized in that: After the new hydrogen pipeline (1) and the circulating hydrogen pipeline (2) are connected, the first of the four pipelines is connected to the first stage hydrogenation product feed pipeline (7), and the connected pipelines are connected to the top of the second stage hydrogenation reactor (10).

5. A two-stage hydrogenation reaction system for a C9 hydrogenated petroleum resin according to claim 4, characterized in that: The solvent oil injection pipeline (8) is connected to the second-stage hydrogenation product pipeline (9) at the bottom end of the second-stage hydrogenation reactor (10).

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