Medicament for preventing coking during dry distillation

Abstract

The invention discloses an agent for preventing coking during dry distillation. The agent comprises the following components in percentage by mass: 5-30% of an organosilicon compound; 3-15% by mass of a metal salt coking inhibitor selected from one or more of an aluminum salt, a calcium salt, a magnesium salt and a zinc salt; 0.5-5% by mass of a nonionic surfactant; and 5-20% by mass of a sustained-release agent selected from a polymer sustained-release material. By adopting the composite formula of the organic silicon compound and the metal salt coke inhibitor, a synergistic effect can be achieved, and the coke generation probability is remarkably reduced. Especially at an extremely high temperature, the components can effectively interfere with a molecular structure formed by coke and reduce coke deposition and coking phenomena, so that the clean and efficient operation of equipment is effectively maintained, and the agent is suitable for various raw materials and different reaction conditions, can adapt to various dry distillation reaction systems such as low-rank coal, oil shale and waste tires, and has a wide application prospect. And the method is not limited by reaction raw materials or temperature.

Description

Technical Field

[0001] The invention relates to the technical field of chemical industry, in particular to an agent for preventing dry distillation from coking. Background Art

[0002] Retort coking prevention agents are chemical additives specifically designed to prevent coking caused by high temperatures during retort operations in petroleum, coal chemical, and other production processes. Coking refers to the formation of coke on the surface of equipment during the high-temperature cracking process due to incomplete reaction or pyrolysis of some substances. In severe cases, this can cause equipment blockage, corrosion, and even shutdown. Retort coking prevention agents improve the reaction environment, reduce the tendency to form coke, and reduce coke accumulation at high temperatures, thereby extending equipment life and improving production efficiency. These agents typically have excellent thermal stability, dispersibility, and the ability to inhibit coke formation, which can significantly reduce the risk of coking and improve the stability of processes such as catalytic cracking.

[0003] Although the anti-coking agents in the existing technology can inhibit the coking phenomenon to a certain extent, they still have some shortcomings and limitations, mainly including the following aspects: Limited effect of the agent: The coking inhibition effect of the anti-coking agent may decrease under high temperature and complex reaction environment, especially when the temperature exceeds a certain critical point, the stability and effect of the agent will be significantly reduced, and it is impossible to completely eliminate the formation of coke. Side effects and pollution problems: Some agents may release harmful substances during use, or the residues of the agent itself may cause corrosion to the equipment. Long-term use will increase the maintenance cost of the system. In addition, some agents may pollute the environment and increase the pressure on waste gas and wastewater treatment. Poor adaptability: Some anti-coking agents on the market are often only suitable for specific raw materials or processes. They have poor adaptability to the type of raw materials and changes in operating conditions. They are difficult to cope with different types of dry distillation reactions, resulting in application limitations. High cost of use: High-efficiency anti-coking agents are usually expensive and require precise control of the amount added. Otherwise, insufficient or excessive addition may occur, affecting the use effect and increasing production costs. Accumulation and difficulty in cleaning: After long-term use, anti-coking agents may accumulate in the system, requiring regular cleaning. Failure to do so can affect the effectiveness of the agent and the normal operation of the equipment. This cleaning process can cause unnecessary wear or corrosion to the equipment. Impact on catalysts: In certain high-temperature retorting processes, the addition of anti-coking agents can affect catalyst activity, reduce reaction efficiency, or even alter the reaction path, thereby affecting the quality and yield of the final product.

[0004] For this reason, we propose to prevent the dry distillation coking agent. Summary of the Invention

[0005] To achieve the above object, the present invention provides the following technical solution: an agent for preventing coking from dry distillation, comprising the following components:

[0006] 5-30% by mass of an organosilicon compound;

[0007] 3-15% by weight of a metal salt scorch inhibitor, selected from one or more of aluminum salts, calcium salts, magnesium salts, and zinc salts;

[0008] 0.5-5% by mass of a nonionic surfactant;

[0009] 5-20% by weight of the sustained-release agent is selected from polymer sustained-release materials.

[0010] Preferably, the organosilicon compound is one or more selected from silane and siloxane.

[0011] Preferably, the metal salt scorch inhibitor is one or more of aluminum chloride, calcium chloride, magnesium chloride and zinc chloride.

[0012] Preferably, the nonionic surfactant is one or more of polyvinyl alcohol, fatty alcohol polyether or alkylbenzene polyether.

[0013] Preferably, the sustained-release agent is one or more of polyvinyl alcohol, polyacrylate, polyurethane or modified starch.

[0014] Compared with the prior art, the present invention provides an agent for preventing coking by dry distillation, which has the following beneficial effects:

[0015] 1. This anti-coking agent for retorting uses a composite formula of an organosilicon compound and a metal salt coke inhibitor, which works synergistically to significantly reduce the probability of coke formation. Especially at extremely high temperatures, these ingredients effectively disrupt the molecular structure of coke formation, reducing coke deposition and coking, thereby effectively maintaining cleanliness and efficient operation of equipment. This not only enhances coke inhibition but also provides antioxidant and corrosion resistance. Furthermore, it decomposes at high temperatures to produce cleansing free radicals, thereby preventing coke deposition and improving system stability.

[0016] 2. The organosilicon compounds, metal salts, and nonionic surfactants used in this anti-coking agent are all low-toxic and harmless, causing no pollution to the production environment. Furthermore, no volatile toxic gases are released, complying with environmental protection requirements. The addition of a sustained-release agent slowly releases the coking-inhibiting components under high-temperature conditions, ensuring the agent's continued effectiveness over a long period of time, avoiding the inconvenience of frequent additions and reducing costs. This sustained-release property is particularly suitable for continuous production processes, ensuring the agent's stability throughout the entire retorting process.

[0017] 3. This anti-coking agent for dry distillation is suitable for a variety of raw materials and different reaction conditions. It can adapt to a variety of dry distillation reaction systems such as low-rank coal, oil shale, and waste tires, and is not limited by the reaction raw materials or temperature. At the same time, it will not negatively affect the activity of the catalyst, ensuring the stability of the catalytic reaction.

[0018] 4. The ingredients in this anti-coking agent will not corrode the surface of the retort reactor and other equipment, reducing the frequency of equipment maintenance and extending the service life of the equipment. Due to its excellent thermal stability, it can maintain long-term stability at extremely high temperatures, ensuring the long-term and efficient operation of the equipment. DETAILED DESCRIPTION

[0019] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0020] Example

[0021] Embodiment of the agent for preventing dry distillation coking

[0022] An agent for preventing dry distillation coking comprises the following components:

[0023] 5-30% by mass of an organosilicon compound;

[0024] 3-15% by weight of a metal salt scorch inhibitor, selected from one or more of aluminum salts, calcium salts, magnesium salts, and zinc salts;

[0025] 0.5-5% by mass of a nonionic surfactant;

[0026] 5-20% by weight of the sustained-release agent is selected from polymer sustained-release materials.

[0027] Specifically, the organosilicon compound is one or more selected from silane and siloxane.

[0028] Specifically, the metal salt scorch inhibitor is one or more of aluminum chloride, calcium chloride, magnesium chloride, and zinc chloride.

[0029] Specifically, the nonionic surfactant is one or more of polyvinyl alcohol, fatty alcohol polyether or alkylbenzene polyether.

[0030] Specifically, the sustained-release agent is one or more of polyvinyl alcohol, polyacrylate, polyurethane or modified starch.

[0031] Through the above technical solution, in the present invention, by adopting a composite formula of organosilicon compounds and metal salt coke inhibitors, a synergistic effect can be achieved, significantly reducing the probability of coke formation. Especially at extremely high temperatures, these ingredients can effectively interfere with the molecular structure of coke formation, reducing coke deposition and coking, thereby effectively keeping the equipment clean and running efficiently, not only enhancing the coke suppression effect, but also providing antioxidant and corrosion resistance. Free radicals with a cleaning effect are generated, thereby preventing the deposition of coke and improving system stability. The organosilicon compounds, metal salts, and non-ionic surfactants used are all low-toxic and harmless ingredients and will not pollute the production environment. The addition of a sustained-release agent can slowly release the coke suppression ingredients under high temperature conditions, ensuring that the agent remains effective for a long time, avoiding the trouble of frequent addition of the agent, and reducing the cost of use. The sustained-release property is particularly suitable for continuous production processes and can ensure the stabilizing effect of the agent throughout the distillation process. The agent is suitable for a variety of raw materials and different reaction conditions, and can adapt to a variety of distillation reaction systems such as low-rank coal, oil shale, and waste tires, without being limited by the reaction raw materials or temperature. At the same time, it will not negatively affect the activity of the catalyst, ensuring the stability of the catalytic reaction. The ingredients in the reagent will not corrode the surface of the distillation reactor and other equipment, reducing the frequency of equipment maintenance and extending the service life of the equipment. Due to its excellent thermal stability, it can maintain long-term stability at extremely high temperatures, ensuring the long-term and efficient operation of the equipment.

[0032] Preparation of anti-coking agent for dry distillation:

[0033] Mix 15g of silane (organic silicon compound) and 2g of polyvinyl alcohol (non-ionic surfactant), heat to 60°C, and stir evenly to form a silane solution;

[0034] 5 g of polyvinyl alcohol (sustained-release agent) was added, and the mixture was concentrated at 80° C. until a suitable preparation was obtained.

[0035] Applied to petroleum cracking reaction:

[0036] In the oil cracking unit, 1.5% (mass ratio) of the anti-coking agent during dry distillation is added to the crude oil;

[0037] The reaction temperature was set at 500°C, and the cracking gas products were collected through a condensation device. It was observed that there was almost no coke accumulation on the inner wall of the device, and the equipment operated stably.

[0038] Test and effect:

[0039] After the reaction was completed, the coking situation in the device was checked and it was found that the coking phenomenon was significantly reduced, and the amount of coke accumulation was reduced by about 80%;

[0040] The quality and yield of the cleavage products were comparable to those of the control group without the addition of the drug, and there were no adverse effects.

[0041] Preparation of anti-coking agent for dry distillation:

[0042] Dissolve 20g of siloxane (organic silicon compound) and 3g of fatty alcohol polyether (non-ionic surfactant), and add 5g of calcium chloride (calcium salt);

[0043] Then add 6 g of polyacrylic acid salt (sustained-release agent), stir evenly, and obtain the medicine.

[0044] Applied to coal gasification reaction:

[0045] 2% (mass ratio) of the agent was added to a coal gasification reactor and the reaction was carried out under gasification conditions of 700°C;

[0046] There is almost no coking inside the gasifier, the reactor walls remain clean, the operating temperature is stable, and there is no equipment damage.

[0047] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An agent for preventing dry distillation coking, characterized by: Includes the following components: 5-30% by mass of an organosilicon compound; 3-15% by weight of a metal salt scorch inhibitor, selected from one or more of aluminum salts, calcium salts, magnesium salts, and zinc salts; 0.5-5% by mass of a nonionic surfactant; 5-20% by weight of the sustained-release agent is selected from polymer sustained-release materials.

2. The agent for preventing dry distillation coking according to claim 1, wherein: The organosilicon compound is one or more selected from silane and siloxane.

3. The agent for preventing dry distillation coking according to claim 1, wherein: The metal salt scorch inhibitor is one or more of aluminum chloride, calcium chloride, magnesium chloride and zinc chloride.

4. The agent for preventing coking by dry distillation according to claim 1, wherein: The nonionic surfactant is one or more of polyvinyl alcohol, fatty alcohol polyether or alkylbenzene polyether.

5. The agent for preventing dry distillation coking according to claim 1, wherein: The sustained-release agent is one or more of polyvinyl alcohol, polyacrylate, polyurethane or modified starch.