Pure recovery oil-gas adsorption separation method

Abstract

The invention belongs to the technical field of oil gas recovery, and particularly relates to an oil gas adsorption separation method by a pure recovery method. By reasonably controlling the adsorption flow of the absorption tower, condensing and then carrying out adsorption-regeneration, and finally absorbing and utilizing the high-concentration oil gas generated in the regeneration process, the efficient operation of the absorption process can be ensured, the use amount of an absorbent is reduced, the energy consumption and the cost in the absorption process are reduced, and meanwhile, the quality and the purity of a liquid product are ensured. The carbonized resin taking styrene-4, 4 '-dichloromethyl-1, 1'-biphenyl resin as a matrix material is adopted as the adsorbent, so that the adsorbent has the advantages of high capacity and high speed, is good in regeneration performance and long in service life, and can still keep relatively good adsorption performance after multiple adsorption-desorption cycles.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil and gas recovery, and particularly relates to a method for adsorptive separation of oil and gas by a pure recovery method. Background Art

[0002] Petroleum and its products are mixtures of various hydrocarbons, and the light components therein have strong volatility. During the entire process of oil extraction, refining, sales, and application, there are serious evaporation losses, resulting in losses of oil products and pollution of the atmospheric environment, which are highly harmful. Therefore, oil and gas recovery is a problem that petroleum storage and transportation and environmental protection scientific and technological workers at home and abroad are very concerned about and urgently need to solve.

[0003] In practical applications, since the adsorption material quickly reaches saturation when directly adsorbing oil and gas with a relatively high concentration, higher requirements are put forward for the service life of the adsorption equipment and the safety of the desorption process. Therefore, the application of the adsorption method is subject to certain limitations. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for adsorptive separation of oil and gas by a pure recovery method, which can improve the adsorption efficiency, extend the adsorption life, and improve the regeneration performance of the adsorbent.

[0005] The present invention provides a method for adsorptive separation of oil and gas by a pure recovery method, including the following steps: Pretreatment: Pass the oil and gas through a condenser to condense the high-boiling components to obtain pretreated oil and gas; Adsorption: Pass the pretreated oil and gas into an adsorption tower, and use an adsorbent to adsorb the hydrocarbon components therein; Regeneration: When the adsorbent reaches saturation, evacuate and depressurize the adsorption tower to desorb the hydrocarbon components on the adsorbent to form high-concentration oil and gas; Recovery: Pass the high-concentration oil and gas generated during the regeneration process into an absorption tower, and use an absorbent to absorb the low-boiling hydrocarbon components therein to convert them into liquid products; The adsorbent is a carbonized resin, and the carbonized resin uses styrene-4,4'-dichloromethyl-1,1'-biphenyl resin as the matrix material.

[0006] Preferably, the preparation method of the carbonized resin includes the following steps: Mix styrene, 4,4'-dichloromethyl-1,1'-biphenyl, an initiator, and a pore-forming agent evenly, add them to water containing a dispersant to form a suspension; Heat the suspension to 60°C - 80°C under stirring conditions for a polymerization reaction, and the time of the polymerization reaction is 2 - 4 h; After the reaction is completed, filter, wash, and dry the polymer particles to obtain styrene-4,4'-dichloromethyl-1,1'-biphenyl resin; Thermally cure the styrene-4,4'-dichloromethyl-1,1'-biphenyl resin particles at 150°C - 200°C for 2 - 4 h to obtain the carbonized resin.

[0007] Preferably, based on parts by mass, the amounts of each substance are as follows: 70 - 90 parts of styrene, 5 - 15 parts of 4,4'-bis(chloromethyl)-1,1'-biphenyl, 0.1 - 1 part of initiator, 5 - 10 parts of pore-forming agent, 1 - 3 parts of dispersant, and 10 - 20 parts of water.

[0008] Preferably, the initiator is benzoyl peroxide, the pore-forming agent is toluene and / or n-heptane, and the dispersant is polyvinyl alcohol.

[0009] Preferably, the temperature of condensation is -80°C to -30°C.

[0010] Preferably, the particle size of the carbonized resin is 1 - 3 mm.

[0011] Preferably, the absorbent is N-methylpyrrolidone or sulfolane.

[0012] Preferably, the conditions for vacuum decompression are decompression from -120 kPa to -80 kPa for 20 - 30 min.

[0013] Advantages of the present invention: By reasonably controlling the adsorption process of the absorption tower, first condensing and then performing adsorption-regeneration, and finally absorbing and utilizing the high-concentration oil and gas generated during the regeneration process, the present invention can ensure the efficient progress of the absorption process, reduce the dosage of the absorbent, lower the energy consumption and cost during the absorption process, and at the same time ensure the quality and purity of the liquid product.

[0014] In the present invention, the high-boiling components in the oil and gas are first condensed and separated, effectively reducing the treatment load of the subsequent adsorption tower, and at the same time improving the purity of the hydrocarbon components in the oil and gas; using a carbonized resin based on styrene-4,4'-bis(chloromethyl)-1,1'-biphenyl resin as the adsorbent has the advantages of high capacity, fast rate, good regeneration performance, and long service life. After multiple adsorption-desorption cycles, it can still maintain good adsorption performance. After the adsorbent is saturated, the hydrocarbon components are desorbed by vacuum decompression to form high-concentration oil and gas. This regeneration method can maximize the recovery of hydrocarbon components on the adsorbent and reduce resource waste.

[0015] After carbonizing the styrene-4,4'-bis(chloromethyl)-1,1'-biphenyl resin, the resin particles can form a stable structure, improving the mechanical strength and thermal stability of the resin, enabling it to operate stably in the adsorption tower for a long time, reducing the loss and replacement frequency of the adsorbent, and lowering the operating cost.

[0016] The equipment involved in the present invention, such as condensers, adsorption towers, absorption towers, etc., are all common chemical engineering equipment, which are easy to purchase and install, and the connection and operation processes between the equipment are simple, facilitating the technical transformation and upgrading of enterprises, and having strong practicability and popularization. Detailed implementation mode

[0017] To further illustrate the present invention, a pure recovery method for oil and gas adsorption separation provided by the present invention will be described in detail below in conjunction with embodiments, but they cannot be understood as limiting the protection scope of the present invention.

[0018] Example 1 1. Preparation of carbonized resin Take 2 parts of polyvinyl alcohol and mix it evenly with 10 parts of water to obtain an aqueous polyvinyl alcohol solution; then take 80 parts of styrene, 10 parts of 4,4'-dichloromethyl-1,1'-biphenyl, 0.5 part of benzoyl peroxide and 8 parts of n-heptane, mix them evenly, and add them to the aqueous polyvinyl alcohol solution to form a suspension; Heat the suspension to 65°C under stirring conditions for a polymerization reaction, and the time of the polymerization reaction is 4 h; after the reaction is completed, filter, wash and dry the polymer particles to obtain styrene-4,4'-dichloromethyl-1,1'-biphenyl resin; Thermally cure the styrene-4,4'-dichloromethyl-1,1'-biphenyl resin particles at 180°C for 3 h to obtain carbonized resin.

[0019] Crush and screen the carbonized resin so that its final particle size is between 1 and 3 mm, and then load 100 g into the adsorption tower.

[0020] 2. Oil and gas recovery Pretreatment: Pass oil and gas into the condenser, and condense high-boiling components at -40°C to obtain pretreated oil and gas; Adsorption: Pass the pretreated oil and gas into the adsorption tower, and use the adsorbent to adsorb the hydrocarbon components therein; weigh the adsorbent before adsorption and after the adsorbent reaches saturation respectively, calculate the difference in the adsorbent before and after adsorption, and obtain the weight gain of the adsorbent; Regeneration: When the adsorbent reaches saturation, evacuate and depressurize the adsorption tower to desorb the hydrocarbon components on the adsorbent to form high-concentration oil and gas; when the mass of the adsorbent no longer changes after 1 h of desorption, it means that the desorption is complete, calculate the difference in the mass of the adsorbent before and after desorption, and obtain the desorption weight; Recovery: Pass the high-concentration oil and gas generated during the regeneration process into the absorption tower, and use the absorbent to absorb the low-boiling hydrocarbon components therein to convert them into liquid products; calculate the mass difference of the absorbent before and after absorption to obtain the mass of the liquid hydrocarbons produced.

[0021] Example 2 1. Preparation of carbonized resin Take 2 parts of polyvinyl alcohol and mix it evenly with 10 parts of water to obtain an aqueous polyvinyl alcohol solution; then take 70 parts of styrene, 15 parts of 4,4'-dichloromethyl-1,1'-biphenyl, 0.1 part of benzoyl peroxide and 5 parts of n-heptane, mix them evenly, and add them to the aqueous polyvinyl alcohol solution to form a suspension; Heat the suspension to 70 °C under stirring conditions for a polymerization reaction, and the time of the polymerization reaction is 3 h; after the reaction is completed, filter, wash and dry the polymer particles to obtain styrene-4,4'-dichloromethyl-1,1'-biphenyl resin; Thermally cure the styrene-4,4'-dichloromethyl-1,1'-biphenyl resin particles at 180 °C for 3 h to obtain a carbonized resin.

[0022] Crush and sieve the carbonized resin so that its final particle size is between 1 and 3 mm, and then load 100 g into the adsorption tower.

[0023] 2. Oil and gas recovery Pretreatment: Pass oil and gas into the condenser, and condense high-boiling components at -80 °C to obtain pretreated oil and gas; Adsorption: Pass the pretreated oil and gas into the adsorption tower, and use the adsorbent to adsorb the hydrocarbon components therein; weigh the adsorbent before adsorption and after the adsorbent reaches saturation respectively, calculate the difference in the adsorbent before and after adsorption, and obtain the weight gain of the adsorbent; Regeneration: When the adsorbent reaches saturation, evacuate and depressurize the adsorption tower to desorb the hydrocarbon components on the adsorbent to form high-concentration oil and gas; when the mass of the adsorbent no longer changes after 1 h of desorption, it means that the desorption is complete, calculate the difference in the mass of the adsorbent before and after desorption, and obtain the desorption weight; Recovery: Pass the high-concentration oil and gas generated during the regeneration process into the absorption tower, and use the absorbent to absorb the low-boiling hydrocarbon components therein to convert them into liquid products; calculate the mass difference of the absorbent before and after absorption to obtain the mass of the liquid hydrocarbons produced.

[0024] Example 3 1. Preparation of carbonized resin Take 2 parts of polyvinyl alcohol and mix it evenly with 20 parts of water to obtain an aqueous polyvinyl alcohol solution; then take 90 parts of styrene, 15 parts of 4,4'-dichloromethyl-1,1'-biphenyl, 1 part of benzoyl peroxide and 10 parts of n-heptane, mix them evenly, and add them to the aqueous polyvinyl alcohol solution to form a suspension; Heat the suspension to 80 °C under stirring conditions for a polymerization reaction, and the time of the polymerization reaction is 2 h; after the reaction is completed, filter, wash and dry the polymer particles to obtain styrene-4,4'-dichloromethyl-1,1'-biphenyl resin; The styrene-4,4'-dichloromethyl-1,1'-biphenyl resin particles were thermally cured at 180 °C for 3 h to obtain a carbonized resin.

[0025] The carbonized resin was crushed and sieved to a final particle size between 1 and 3 mm, and then 100 g was loaded into the adsorption tower.

[0026] 2. Oil and gas recovery Pretreatment: Oil and gas were introduced into the condenser, and high-boiling components were condensed at -30 °C to obtain pretreated oil and gas. Adsorption: The pretreated oil and gas were introduced into the adsorption tower, and the hydrocarbon components were adsorbed by the adsorbent; the adsorbent was weighed before adsorption and after reaching saturation, and the difference in the weight of the adsorbent before and after adsorption was calculated to obtain the weight gain of the adsorbent. Regeneration: When the adsorbent reached saturation, the adsorption tower was evacuated to reduce pressure, so that the hydrocarbon components on the adsorbent were desorbed to form high-concentration oil and gas; when the mass of the adsorbent no longer changed after 1 h of desorption, it indicated that the desorption was complete, and the difference in the mass of the adsorbent before and after desorption was calculated to obtain the desorption weight. Recovery: The high-concentration oil and gas generated during the regeneration process were introduced into the absorption tower, and the low-boiling hydrocarbon components were absorbed by the absorbent to be converted into a liquid product; by calculating the difference in the mass of the absorbent before and after absorption, the mass of the liquid hydrocarbons produced was obtained.

[0027] Example 4 1. Preparation of carbonized resin Take 2 parts of polyvinyl alcohol and mix it evenly with 20 parts of water to obtain an aqueous polyvinyl alcohol solution; then take 90 parts of styrene, 15 parts of 4,4'-dichloromethyl-1,1'-biphenyl, 1 part of benzoyl peroxide and 10 parts of n-heptane and mix them evenly, and add them to the aqueous polyvinyl alcohol solution to form a suspension. The suspension was heated to 80 °C under stirring conditions for a polymerization reaction, and the time of the polymerization reaction was 2 h; after the reaction was completed, the polymer particles were filtered, washed and dried to obtain styrene-4,4'-dichloromethyl-1,1'-biphenyl resin. The styrene-4,4'-dichloromethyl-1,1'-biphenyl resin particles were thermally cured at 180 °C for 3 h to obtain a carbonized resin.

[0028] The carbonized resin was crushed and sieved to a final particle size between 1 and 3 mm, and then 100 g was loaded into the adsorption tower.

[0029] 2. Oil and gas recovery Pretreatment: Oil and gas were introduced into the condenser, and high-boiling components were condensed at -60 °C to obtain pretreated oil and gas. Adsorption: Feed the pretreated oil gas into the adsorption tower, and use the adsorbent to adsorb the hydrocarbon components therein; Weigh the adsorbent before adsorption and after it reaches saturation respectively, calculate the difference in the adsorbent before and after adsorption, and obtain the weight gain of the adsorbent. Regeneration: After the adsorbent reaches saturation, evacuate and depressurize the adsorption tower to desorb the hydrocarbon components on the adsorbent, forming high-concentration oil gas; When the mass of the adsorbent no longer changes after 1 hour of desorption, it indicates that the desorption is complete. Calculate the difference in the mass of the adsorbent before and after desorption to obtain the desorption weight. Recovery: Feed the high-concentration oil gas generated during the regeneration process into the absorption tower, and use the absorbent to absorb the low-boiling hydrocarbon components therein, converting them into liquid products; Calculate the difference in the mass of the absorbent before and after absorption to obtain the mass of the liquid hydrocarbons produced.

[0030] Comparative Example 1 The difference from Example 1 is that styrene-divinylbenzene resin is used as the matrix material, specifically as follows: 1. Preparation of carbonized resin Thermally cure the styrene-divinylbenzene resin particles at 180 °C for 3 hours to obtain carbonized resin.

[0031] Crush and screen the carbonized resin so that its final particle size is between 1 and 3 mm, and then load 100 g into the adsorption tower.

[0032] 2. Oil gas recovery Pretreatment: Feed the oil gas into the condenser, and condense the high-boiling components at -40 °C to obtain the pretreated oil gas; Adsorption: Feed the pretreated oil gas into the adsorption tower, and use the adsorbent to adsorb the hydrocarbon components therein; Weigh the adsorbent before adsorption and after it reaches saturation respectively, calculate the difference in the adsorbent before and after adsorption, and obtain the weight gain of the adsorbent. Regeneration: After the adsorbent reaches saturation, evacuate and depressurize the adsorption tower to desorb the hydrocarbon components on the adsorbent, forming high-concentration oil gas; When the mass of the adsorbent no longer changes after 1 hour of desorption, it indicates that the desorption is complete. Calculate the difference in the mass of the adsorbent before and after desorption to obtain the desorption weight. Recovery: Feed the high-concentration oil gas generated during the regeneration process into the absorption tower, and use the absorbent to absorb the low-boiling hydrocarbon components therein, converting them into liquid products; Calculate the difference in the mass of the absorbent before and after absorption to obtain the mass of the liquid hydrocarbons produced.

[0033] Comparative Example 2 The difference from Example 1 is that styrene-4,4'-dichloromethyl-1,1'-biphenyl resin is not carbonized, specifically as follows: 1. Preparation of resin Take 2 parts of polyvinyl alcohol and mix it evenly with 10 parts of water to obtain an aqueous polyvinyl alcohol solution; then take 80 parts of styrene, 10 parts of 4,4'-dichloromethyl-1,1'-biphenyl, 0.5 part of benzoyl peroxide and 8 parts of n-heptane, mix them evenly, and add them to the aqueous polyvinyl alcohol solution to form a suspension; Heat the suspension to 65 °C under stirring conditions for polymerization reaction, and the time of the polymerization reaction is 4 h; after the reaction is completed, filter, wash and dry the polymer particles to obtain styrene-4,4'-dichloromethyl-1,1'-biphenyl resin.

[0034] Crush and sieve the styrene-4,4'-dichloromethyl-1,1'-biphenyl resin so that its final particle size is between 1 and 3 mm, and then load 100 g into the adsorption tower.

[0035] 2. Oil and gas recovery Pretreatment: Pass oil and gas into the condenser, and condense high-boiling components at -40 °C to obtain pretreated oil and gas; Adsorption: Pass the pretreated oil and gas into the adsorption tower, and use the adsorbent to adsorb the hydrocarbon components therein; weigh the adsorbent before adsorption and after the adsorbent reaches saturation respectively, calculate the difference in the adsorbent before and after adsorption, and obtain the weight gain of the adsorbent; Regeneration: When the adsorbent reaches saturation, evacuate and depressurize the adsorption tower to desorb the hydrocarbon components on the adsorbent to form high-concentration oil and gas; when the mass of the adsorbent no longer changes after 1 h of desorption, it means that the desorption is complete, calculate the difference in the mass of the adsorbent before and after desorption, and obtain the desorption weight; Recovery: Pass the high-concentration oil and gas generated during the regeneration process into the absorption tower, and use the absorbent to absorb the low-boiling hydrocarbon components therein to convert them into liquid products; calculate the mass difference of the absorbent before and after absorption to obtain the mass of the liquid hydrocarbons produced.

[0036] Comparative Example 3 The difference from Example 1 is that no condensation treatment is carried out, and the details are as follows: 1. Preparation of carbonized resin Take 2 parts of polyvinyl alcohol and mix it evenly with 10 parts of water to obtain an aqueous polyvinyl alcohol solution; then take 80 parts of styrene, 10 parts of 4,4'-dichloromethyl-1,1'-biphenyl, 0.5 part of benzoyl peroxide and 8 parts of n-heptane, mix them evenly, and add them to the aqueous polyvinyl alcohol solution to form a suspension; Heat the suspension to 65 °C under stirring conditions for polymerization reaction, and the time of the polymerization reaction is 4 h; after the reaction is completed, filter, wash and dry the polymer particles to obtain styrene-4,4'-dichloromethyl-1,1'-biphenyl resin; Thermally cure the styrene-4,4'-dichloromethyl-1,1'-biphenyl resin particles at 180 °C for 3 h to obtain carbonized resin.

[0037] The carbonized resin is crushed and sieved so that its final particle size is between 1 and 3 mm, and then 100 g is loaded into the adsorption tower.

[0038] 2. Oil and gas recovery Adsorption: The oil and gas is passed into the adsorption tower, and the hydrocarbon components therein are adsorbed by the adsorbent; the adsorbent is weighed before adsorption and after it reaches saturation, and the difference in the weight of the adsorbent before and after adsorption is calculated to obtain the weight gain of the adsorbent. Regeneration: When the adsorbent reaches saturation, the adsorption tower is evacuated and depressurized to desorb the hydrocarbon components on the adsorbent to form high-concentration oil and gas; when the mass of the adsorbent no longer changes after 1 h of desorption, it indicates that the desorption is complete, and the difference in the mass of the adsorbent before and after desorption is calculated to obtain the desorption weight. Recovery: The high-concentration oil and gas generated during the regeneration process is passed into the absorption tower, and the low-boiling hydrocarbon components therein are absorbed by the absorbent to be converted into a liquid product; by calculating the difference in the mass of the absorbent before and after absorption, the mass of the liquid hydrocarbons produced is obtained.

[0039] Comparative Example 4 The difference from Example 1 is that the carbonized resin is not sieved, and the details are as follows: 1. Preparation of carbonized resin Take 2 parts of polyvinyl alcohol and mix it evenly with 10 parts of water to obtain an aqueous polyvinyl alcohol solution; then take 80 parts of styrene, 10 parts of 4,4'-dichloromethyl-1,1'-biphenyl, 0.5 part of benzoyl peroxide, and 8 parts of n-heptane and mix them evenly, and add them to the aqueous polyvinyl alcohol solution to form a suspension. The suspension is heated to 65 °C under stirring conditions for a polymerization reaction, and the time of the polymerization reaction is 4 h; after the reaction is completed, the polymer particles are filtered, washed, and dried to obtain styrene-4,4'-dichloromethyl-1,1'-biphenyl resin. The styrene-4,4'-dichloromethyl-1,1'-biphenyl resin particles are thermally cured at 180 °C for 3 h to obtain carbonized resin.

[0040] 100 g of the carbonized resin is loaded into the adsorption tower.

[0041] 2. Oil and gas recovery Pretreatment: The oil and gas is passed into the condenser, and the high-boiling components are condensed at -40 °C to obtain pretreated oil and gas. Adsorption: The pretreated oil and gas is passed into the adsorption tower, and the hydrocarbon components therein are adsorbed by the adsorbent; the adsorbent is weighed before adsorption and after it reaches saturation, and the difference in the weight of the adsorbent before and after adsorption is calculated to obtain the weight gain of the adsorbent. Regeneration: After the adsorbent reaches saturation, the adsorption tower is evacuated and depressurized to desorb the hydrocarbon components on the adsorbent, forming high-concentration oil and gas. When the mass of the adsorbent no longer changes after 1 hour of desorption, it indicates that the desorption is complete. Calculate the difference in the mass of the adsorbent before and after desorption to obtain the desorbed weight. Recovery: The high-concentration oil and gas generated during the regeneration process are introduced into the absorption tower, and the absorbent is used to absorb the low-boiling hydrocarbon components therein, converting them into liquid products. By calculating the difference in the mass of the absorbent before and after absorption, the mass of the liquid hydrocarbons produced is obtained.

[0042] Comparative Example 5 The difference from Example 1 is that the thermal desorption method is used in the regeneration process, which is specifically as follows: 1. Preparation of carbonized resin Take 2 parts of polyvinyl alcohol and mix it evenly with 10 parts of water to obtain an aqueous polyvinyl alcohol solution. Then take 80 parts of styrene, 10 parts of 4,4'-dichloromethyl-1,1'-biphenyl, 0.5 part of benzoyl peroxide, and 8 parts of n-heptane, mix them evenly, and add them to the aqueous polyvinyl alcohol solution to form a suspension. Heat the suspension to 65 °C under stirring conditions for a polymerization reaction, and the time of the polymerization reaction is 4 h. After the reaction is completed, filter, wash, and dry the polymer particles to obtain styrene-4,4'-dichloromethyl-1,1'-biphenyl resin. Thermally cure the styrene-4,4'-dichloromethyl-1,1'-biphenyl resin particles at 180 °C for 3 h to obtain carbonized resin.

[0043] Crush and screen the carbonized resin so that its final particle size is between 1 and 3 mm, and then load 100 g into the adsorption tower.

[0044] 2. Oil and gas recovery Pretreatment: Introduce oil and gas into the condenser, and condense the high-boiling components at -40 °C to obtain pretreated oil and gas. Adsorption: Introduce the pretreated oil and gas into the adsorption tower, and use the adsorbent to adsorb the hydrocarbon components therein. When the mass of the adsorbent no longer changes after 1 hour of desorption, it indicates that the desorption is complete. Calculate the difference in the mass of the adsorbent before and after desorption to obtain the desorbed weight. Regeneration: After the adsorbent reaches saturation, heat the adsorption tower to 180 °C to desorb the hydrocarbon components on the adsorbent, forming high-concentration oil and gas. When the mass of the adsorbent no longer changes after 1 hour of desorption, it indicates that the desorption is complete. Calculate the difference in the mass of the adsorbent before and after desorption to obtain the desorbed weight. Recovery: The high-concentration oil and gas generated during the regeneration process are introduced into the absorption tower, and the absorbent is used to absorb the low-boiling hydrocarbon components therein, converting them into liquid products. By calculating the difference in the mass of the absorbent before and after absorption, the mass of the liquid hydrocarbons produced is obtained.

[0045] Test Example 1 The absorption effects of Examples 1 to 4 and Comparative Examples 1 to 5 were evaluated separately, and the mass of liquid hydrocarbons generated during the absorption process was compared.

[0046] The weight gain of the adsorbent after adsorption and the desorption weight during the regeneration process were measured, and the desorption efficiency was calculated. The results are shown in Table 1.

[0047] Desorption efficiency = desorption weight / weight gain of adsorbent × 100% Table 1 Desorption Efficiency

[0048] As can be seen from Table 1, the weight gain of the adsorbent and the desorption efficiency of Example 1 were significantly higher than those of Comparative Example 1, indicating that the carbonized resin with styrene-4,4'-dichloromethyl-1,1'-biphenyl resin as the matrix material of the present invention as an adsorbent has higher adsorption capacity and good regeneration performance compared with the traditional styrene-divinylbenzene resin; the weight gain of the adsorbent and the desorption efficiency of Comparative Example 4 were significantly lower than those of Example 1, indicating that when the particle size of the carbonized resin is uniform, it is more conducive to increasing the adsorption capacity; by comparing the mass of liquid hydrocarbons generated during the absorption process between Comparative Example 3 and Example 1, it can be seen that pre-cooling the oil and gas is beneficial to recovering more hydrocarbon substances and improving the recovery efficiency.

[0049] Test Example 2 The oil and gas recovery operations were repeated using the schemes of Examples 1 to 4 and Comparative Examples 1 to 5 respectively, and the weight gain of the adsorbent at different repetition times was recorded to evaluate the change in the absorption performance of the adsorbent. The results are shown in Table 2.

[0050] Table 2 Changes in Adsorbent Performance at Different Repetition Times

[0051] As can be seen from Table 2, after 6 repeated adsorption-desorption cycles of the adsorbents in Examples 1 to 4, the weight gain of the adsorbent did not show a significant decrease, indicating that the carbonized resin prepared by the present invention has a long service life and can still maintain good adsorption performance after multiple adsorption-desorption cycles. After 6 oil and gas recoveries, the weight gain of the adsorbents in Comparative Example 1, Comparative Example 2, Comparative Example 4, and Comparative Example 5 all showed obvious decreases, indicating that the type of resin, the treatment method of the resin, and the desorption method all have different degrees of influence on the service life of the adsorbent.

[0052] Although the above embodiments have described the present invention in detail, they are only a part of the embodiments of the present invention, not all of them. People can also obtain other embodiments without creative work based on these embodiments, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A pure recovery method for oil and gas adsorption separation, characterized in that, It includes the following steps: Pretreatment: Pass the oil and gas through a condenser to condense the high-boiling components, obtaining pretreated oil and gas; Adsorption: Pass the pretreated oil and gas into an adsorption tower, and use an adsorbent to adsorb the hydrocarbon components therein; Regeneration: When the adsorbent reaches saturation, evacuate and depressurize the adsorption tower to desorb the hydrocarbon components on the adsorbent, forming high-concentration oil and gas; Recovery: Pass the high-concentration oil and gas generated during the regeneration process into an absorption tower, and use an absorbent to absorb the low-boiling hydrocarbon components therein to convert them into liquid products; The adsorbent is a carbonized resin, and the carbonized resin uses styrene-4,4'-dichloromethyl-1,1'-biphenyl resin as the matrix material.

2. The method according to claim 1, wherein The preparation method of the carbonized resin includes the following steps: Mix styrene, 4,4'-dichloromethyl-1,1'-biphenyl, an initiator, and a pore-forming agent evenly, and add them to water containing a dispersant to form a suspension; Heat the suspension to 60°C - 80°C under stirring conditions for polymerization reaction. The time of the polymerization reaction is 2 - 4 h; after the reaction is completed, filter, wash, and dry the polymer particles to obtain styrene-4,4'-dichloromethyl-1,1'-biphenyl resin; Thermally cure the styrene-4,4'-dichloromethyl-1,1'-biphenyl resin particles at 150°C - 200°C for 2 - 4 h to obtain the carbonized resin.

3. The method according to claim 2, wherein By mass, the dosage of each substance is: 70 - 90 parts of styrene, 5 - 15 parts of 4,4'-dichloromethyl-1,1'-biphenyl, 0.1 - 1 part of initiator, 5 - 10 parts of pore-forming agent, 1 - 3 parts of dispersant, and 10 - 20 parts of water.

4. The method according to claim 2, wherein The initiator is benzoyl peroxide, the pore-forming agent is toluene and / or n-heptane, and the dispersant is polyvinyl alcohol.

5. The method according to claim 1, characterized in that, The temperature of the condensation is -80°C - -30°C.

6. The method according to claim 1, characterized in that, The particle size of the carbonized resin is 1 - 3 mm.

7. The method according to claim 1, characterized in that, The absorbent is N-methylpyrrolidone or sulfolane.

8. The method according to claim 1, characterized in that The conditions of the evacuation and depressurization are -120 kPa - -80 kPa for 20 - 30 min.

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