Energy-saving device for producing hydrogen-containing silicone oil
By designing an energy-saving device including a fixed bed, delowing preheater, evaporator and low molecular weight recovery system, the problem of the heat of high-temperature hydrogen-containing silicone oil not being fully utilized, and efficient energy utilization and production cost reduction are achieved.
Patent Information
- Application Number
- CN202421511029.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-06-28
AI Technical Summary
In the existing hydrogen-containing silicone oil production technology, the heat of hydrogen-containing silicone oil after high temperature treatment cannot be fully utilized, resulting in waste of energy and high production costs.
An energy-saving device including a fixed bed, a delowing preheater, an evaporator and a low molecular weight recovery system was designed. By reusing high-temperature hydrogen-containing silicone oil, the preliminary and secondary utilization of waste heat is achieved, and the dependence on cooling medium and heating medium is reduced.
By reusing the heat of high-temperature hydrogen-containing silicone oil, production costs are reduced, energy consumption is reduced, and the use of cooling media is avoided.
Smart Images
Figure CN222739119U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hydrogen-containing silicone oil production, in particular to an energy-saving device for producing hydrogen-containing silicone oil. Background Art
[0002] Organic silicon material is a new type of material developed in recent decades. It is mainly divided into four categories: silicone rubber, silicone oil, silane coupling agent, and silicone resin. It is widely used in aerospace, pharmaceutical engineering, machinery manufacturing and other industries. The common raw material high hydrogen silicone oil for producing organic silicon downstream products is obtained by hydrolyzing methyl hydrogen chlorosilane to obtain primary hydrogen silicone oil, which is further refined.
[0003] The domestic production process of hydrogenated silicone oil uses steam to preheat the primary hydrolyzate to remove low components, and the bottom material coming out of the evaporator is directly cooled to about 50°C by circulating water and then taken out to the next process. However, the latent heat of the material at the bottom of the evaporator is not utilized, which wastes energy and increases the circulation volume of circulating water. In the past 10 years, the domestic production level of silicone has made great progress, and the gap with foreign advanced technology has become smaller and smaller, but the comprehensive production cost of hydrogenated silicone oil is still quite different. In recent years, the global production capacity of silicone has shifted to China. my country has now become the world's largest producer of silicone, with monomer production capacity accounting for more than 60% of the world. In recent years, the global silicone market has continued to be sluggish, so it is necessary to promote energy conservation and consumption reduction. Reducing production costs is one of the ways out for domestic silicone companies.
[0004] In the existing hydrogenated silicone oil production technology, a large amount of heating medium, steam or heat transfer oil, etc., is required to remove low components from hydrogenated silicone oil in the process of removing low components. The temperature is as high as 150-160°C, and the vacuum negative pressure is above -90Kpa, so as to reduce the low components in the hydrogenated silicone oil to less than 2%. The current technology requires that after the hydrogenated silicone oil is subjected to high temperature to remove low components, it is also necessary to use industrial circulating water and other cooling media to cool it down before entering the next process or storage. The existing technology does not fully utilize the heat of the hydrogenated silicone oil that has been treated at high temperature, but only uses a common medium for cooling treatment. Utility Model Content
[0005] The utility model aims to provide an energy-saving device for producing hydrogen-containing silicone oil, which can fully utilize the heat of the hydrogen-containing silicone oil treated at high temperature, save energy and reduce consumption, and reduce production costs.
[0006] The embodiments of the present invention are implemented by the following technical solutions:
[0007] An energy-saving device for producing hydrogenated silicone oil comprises a fixed bed, a first degassing preheater, a second degassing preheater, an evaporator and a low-molecular recovery system which are connected in sequence, wherein the evaporator is connected to the first degassing preheater, and the fixed bed is connected to the refining system.
[0008] Furthermore, the energy-saving device also includes a fixed bed feed preheater, which is connected to the fixed bed and the refining system respectively, and the first degassing preheater is connected to the fixed bed feed preheater.
[0009] Furthermore, the energy-saving device also includes a hydrolysis reaction system, an acid washing system and a dehydration system which are connected in sequence, and the discharge port of the dehydration system is connected to the fixed bed feed preheater.
[0010] Furthermore, a catalyst is arranged in the fixed bed.
[0011] Furthermore, the first preheater and the second preheater are both shell-and-tube heat exchangers.
[0012] Furthermore, the refining system includes an activated carbon adsorber and a filter connected in sequence.
[0013] Furthermore, the heat source of the second degassing preheater is steam or heat transfer oil of a methylchlorosilane monomer device.
[0014] The technical solution of the embodiment of the utility model has at least the following advantages and beneficial effects:
[0015] In the utility model, the crude hydrogenated silicone oil is telopolymerized by a fixed bed, the molecular weight of the polymer (hydrogenated silicone oil) is adjusted, and the molecular weight is averaged. The hydrogenated silicone oil after the telopolymerization reaction still contains some low-component substances (short-chain hydrogenated silicone oil and other low-components), and needs to go through a low-molecular-weight removal process, and the hydrogenated silicone oil coming out of the fixed bed is heated by the first de-lowering preheater and the second de-lowering preheater, and then the low-molecular-weight components are removed in the evaporator. The low-molecular-weight components removed by the evaporator enter the low-molecular-weight recovery system for recovery. The high-molecular-weight components (i.e., high-temperature hydrogenated silicone oil) after the evaporator is removed enter the first de-lowering preheater to heat the hydrogenated silicone oil coming out of the fixed bed for the first time, so as to realize the initial utilization of the waste heat, and then enter the fixed bed, and heat the crude hydrogenated silicone oil in the fixed bed to make it undergo a telopolymerization reaction, so as to realize the secondary utilization of the waste heat, and finally the high-molecular-weight components enter the refining system for refining. The energy-saving device reduces the temperature of the hydrogenated silicone oil by reusing the heat of the high-temperature treated hydrogenated silicone oil, without the need to use a cooling medium for cooling. It can also reduce the use of heating medium, thereby saving energy and reducing consumption and production costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0017] Figure 1 A schematic diagram of the structure of an energy-saving device for producing hydrogenated silicone oil provided in Example 1 of the utility model;
[0018] Figure 2 Another structural schematic diagram of the energy-saving device for producing hydrogenated silicone oil provided in Example 1 of the utility model.
[0019] Icons: 1- hydrolysis reaction system, 2- acid washing system, 3- dehydration system, 4- fixed bed feed preheater, 5- fixed bed, 6- first dehydration preheater, 7- second dehydration preheater, 8- evaporator, 9- low molecular weight recovery system, 10- refining system. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0022] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0023] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0024] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0025] Example 1
[0026] like Figure 1 As shown, this embodiment provides an energy-saving device for producing hydrogenated silicone oil, comprising a fixed bed 5, a first degassing preheater 6, a second degassing preheater 7, an evaporator 9 and a low molecular weight recovery system 9 connected in sequence, and the evaporator 8 is connected to the first degassing preheater 6, and the fixed bed 5 is connected to the refining system 10.
[0027] The crude hydrogenated silicone oil is added into the fixed bed 5. Initially, the fixed bed 5 is heated by an external heat source to make the temperature in the fixed bed 5 reach 50-60°C. The crude hydrogenated silicone oil undergoes a telomerization reaction in the fixed bed 5 to adjust the molecular weight of the polymer (hydrogenated silicone oil) and average the molecular weight. The hydrogenated silicone oil after the telomerization reaction still contains some low-component substances (short-chain hydrogenated silicone oil and other low-components), and needs to go through a low-molecular weight removal process. The hydrogenated silicone oil coming out of the fixed bed 5 is heated by the first preheater 6 and the second preheater 7, and then the low-molecular weight components are removed in the evaporator 8. The low-molecular weight components removed by the evaporator 8 enter the low-molecular weight recovery system 9 for recovery. The high molecular weight components (high temperature hydrogenated silicone oil) after degassing in the evaporator 8 enter the first degassing preheater 6 to heat the hydrogenated silicone oil coming out of the fixed bed 5 for the first time, realizing the initial utilization of the waste heat, and then enter the fixed bed 5 to heat the crude hydrogenated silicone oil in the fixed bed 5 to make it undergo a telomerization reaction (no external heat source is required for heating at this time), realizing the secondary utilization of the waste heat, and finally the high molecular weight components enter the refining system 10 for refining. The energy-saving device reduces the temperature of the hydrogenated silicone oil by reusing the heat of the high temperature treated hydrogenated silicone oil, without using a cooling medium for cooling, and can also reduce the use of heating medium, saving energy and reducing production costs.
[0028] Before entering the evaporator 8 for degassing, it needs to pass through the first degassing preheater 6 and use the high-temperature hydrogenated silicone oil (150-160°C) coming out from the bottom of the evaporator 8 for the first heating. According to calculations, the hydrogenated silicone oil fed into the first degassing preheater 6 can be heated to 96°C, and then heated to 145-150°C in the second degassing preheater 7 using S10 steam or the heat transfer oil of the methylchlorosilane monomer device, and then enter the evaporator 8 for degassing components.
[0029] like Figure 2As shown, the energy-saving device also includes a fixed bed feed preheater 4, which is connected to the fixed bed 5 and the refining system 10 respectively, and the first degassing preheater 6 is connected to the fixed bed feed preheater 4. A catalyst is arranged in the fixed bed 5, and the upper and lower parts of the fixed bed 5 are fixed by balls. The fixed bed 5 is mainly used to adjust the molecular weight of the polymer (hydrogen-containing silicone oil) and average the molecular weight. Because the optimal catalytic temperature of the catalyst of the fixed bed 5 is 50-60°C, the hydrogen-containing silicone oil that is about to enter the fixed bed 5 needs to be heated to the optimal temperature before entering the fixed bed for telomerization reaction. Therefore, the fixed bed feed preheater 4 is used to heat the crude hydrogen-containing silicone oil first, and then the heated crude hydrogen-containing silicone oil is added to the fixed bed 5, and the telomerization reaction occurs under the action of the catalyst. In addition, the high molecular weight component (high temperature hydrogenated silicone oil) entering the first degassing preheater 6 then enters the fixed bed feed preheater 4, and the waste heat of the high molecular weight component is used to heat the crude hydrogenated silicone oil, thereby achieving full utilization of the heat of the high molecular weight component (high temperature hydrogenated silicone oil).
[0030] In this embodiment, the energy-saving device also includes a hydrolysis reaction system 1, an acid washing system 2 and a dehydration system 3 which are connected in sequence, and the discharge port of the dehydration system 3 is connected to the fixed bed feed preheater 4. The hydrolysis reaction system 1 is used to dissolve the hydrogenated silicone oil raw material, the acid washing system 2 is used to elute and separate the acid in the hydrogenated silicone oil to improve the yield of the hydrogenated silicone oil, and the dehydration system 3 is used to dehydrate the hydrogenated silicone oil to improve the purity of the hydrogenated silicone oil to obtain crude hydrogenated silicone oil. The crude hydrogenated silicone oil is then heated by the fixed bed feed preheater 4, and after heating, it is transported to the fixed bed 5 for telomerization reaction.
[0031] In this embodiment, the first degassing preheater 6 and the second degassing preheater 7 are both shell-and-tube heat exchangers.
[0032] In this embodiment, the refining system 10 includes an activated carbon adsorber and a filter connected in sequence. The activated carbon adsorption and filtration can improve the purity of the hydrogen-containing silicone oil finally obtained.
[0033] The hydrogen-containing silicone oil coming out of the evaporator 8 is calculated at 0.3 tons / hour, the temperature is 150°C, the feed temperature of the evaporator 8 (mainly the low-molecular hydrogen-containing silicone oil that has not been removed) is 50°C, and the feed amount is 0.33 tons / hour. The feed to the evaporator 8 is heated once, and the area and type of the heat exchanger need to be designed and set; at the same time, the high-temperature hydrogen-containing silicone oil coming out of the evaporator 8 enters the fixed bed feed preheater 4, and heats the crude hydrogen-containing silicone oil (temperature 25°C, feed amount is 0.33 tons / hour) fed to the fixed bed 5 to ensure that the feed temperature of the fixed bed 5 reaches 55°C.
[0034] After heat exchange calculation, the specific heat exchange values are shown in the following table:
[0035]
[0036] The working principle of an energy-saving device for producing hydrogenated silicone oil is as follows: a hydrolysis reaction system 1 is used to dissolve the hydrogenated silicone oil raw material, an acid washing system 2 is used to elute and separate the acid in the dissolved hydrogenated silicone oil, and a dehydration system 3 is used to dehydrate the washed hydrogenated silicone oil to obtain crude hydrogenated silicone oil. A fixed bed feed preheater 4 is used to heat the crude hydrogenated silicone oil, and after heating, the crude hydrogenated silicone oil is transported to a fixed bed 5 for telomerization reaction. After the telomerization reaction, the hydrogenated silicone oil enters the first dehydrogenation preheater 6 and the second dehydrogenation preheater 7 in turn for heating, and then dehydrogenates components in an evaporator 8, and the low molecular weight components after dehydrogenation enter a low molecular weight recovery system 9. The high molecular weight component (high temperature hydrogenated silicone oil) after degassing enters the first degassing preheater 6 to heat the hydrogenated silicone oil coming out of the fixed bed 5 for the first time, thereby realizing the initial utilization of the waste heat, and then enters the fixed bed 5 to heat the crude hydrogenated silicone oil in the fixed bed 5 to make it undergo a polymerization reaction (no external heat source is required for heating at this time), thereby realizing the secondary utilization of the waste heat, and finally the high molecular weight component enters the refining system 10 for refining.
[0037] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. An energy-saving device for producing hydrogenated silicone oil, characterized in that: The invention comprises a fixed bed, a first degassing preheater, a second degassing preheater, an evaporator and a low-molecular recovery system which are connected in sequence, wherein the evaporator is connected to the first degassing preheater, and the fixed bed is connected to the refining system.
2. The energy-saving device for producing hydrogenated silicone oil according to claim 1, characterized in that: The energy-saving device also includes a fixed bed feed preheater, which is connected to the fixed bed and the refining system respectively, and the first degassing preheater is connected to the fixed bed feed preheater.
3. The energy-saving device for producing hydrogenated silicone oil according to claim 2, characterized in that: The energy-saving device also includes a hydrolysis reaction system, an acid separation washing system and a dehydration system which are connected in sequence, and the discharge port of the dehydration system is connected to the fixed bed feed preheater.
4. The energy-saving device for producing hydrogenated silicone oil according to claim 1, characterized in that: A catalyst is arranged in the fixed bed.
5. The energy-saving device for producing hydrogenated silicone oil according to claim 1, characterized in that: The first preheater and the second preheater are both shell-and-tube heat exchangers.
6. The energy-saving device for producing hydrogenated silicone oil according to claim 1, characterized in that: The refining system comprises an activated carbon adsorber and a filter which are connected in sequence.
7. The energy-saving device for producing hydrogenated silicone oil according to claim 1, characterized in that: The heat source of the second degassing preheater is steam or heat transfer oil of a methylchlorosilane monomer device.