A single furnace and double tower device for direct production of industrial naphthalene without washing
By abolishing the washing section in the industrial naphthalene distillation process, using a single furnace and double tower device and a reduced pressure + normal pressure combination process, the problems of high waste liquid treatment and energy consumption in the traditional process are solved, and efficient and environmentally friendly industrial naphthalene production is achieved.
Patent Information
- Application Number
- CN202411986931.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-04-08
AI Technical Summary
The traditional industrial naphthalene distillation process requires a washing process, which makes it difficult to deal with sodium sulfate waste liquid and has the problem of high energy consumption.
The industrial naphthalene single furnace double tower device is used to directly produce industrial naphthalene single furnace and double tower device. Through the combined process of primary distillation tower and rectification tower, the combined process of reduced pressure + normal pressure is used to achieve efficient distillation of industrial naphthalene, and reduce energy consumption through sufficient heat exchange.
The industrial naphthalene production without new wastewater has been achieved, reducing energy consumption, and the energy consumption of industrial naphthalene can be reduced to 78Nm3 gas/t triple mixed oil.
Smart Images
Figure CN119771003A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of coal tar processing, in particular to a single furnace double tower device for directly producing industrial naphthalene without washing. Background Art
[0002] Industrial naphthalene is an important organic chemical raw material, widely used in synthetic fibers, synthetic resins, plasticizers, rubber antioxidants, dye intermediates, medicines, sanitary materials and some new fine chemical industries. It can be used to produce chemical products such as phthalic anhydride, 2-naphthol, α-naphthylamine, diisopropylnaphthalene, diffusers, H-acid, etc. The largest use of naphthalene is to produce phthalic anhydride. Industrial naphthalene accounts for about 10% of coal tar and is one of the most important chemicals in coal tar. Industrial naphthalene is produced by continuous distillation with tubular furnace heating, and there are three processes: double furnace and double tower, single furnace and double tower, and single furnace and single tower.
[0003] The double-furnace double-tower distillation process consists of two distillation towers and two heating furnaces. That is, the phenol oil fraction is cut in the primary distillation tower, and the industrial naphthalene and wash oil fractions are cut in the distillation tower. The two distillation towers are heated by two heating furnaces respectively. The single-furnace double-tower distillation process consists of two distillation towers and a heating furnace. That is, the phenol oil fraction is cut in the primary distillation tower, and the industrial naphthalene and wash oil fractions are cut in the distillation tower. The two distillation towers are heated by a heating furnace. The single-furnace single-tower distillation process consists of a distillation tower and a heating furnace. Industrial naphthalene is extracted from the side line of the distillation tower. The distillation tower is heated by a heating furnace.
[0004] Because tar contains corrosive media such as ammonium salts, which will enter the mixture or naphthalene oil, the traditional industrial naphthalene distillation process needs to be washed by adding alkali, which can recover phenolic substances in the mixture / naphthalene oil on the one hand, and remove corrosive media such as ammonium salts contained therein on the other hand. However, with the increasing environmental protection requirements, the sodium sulfate waste liquid generated during the washing and decomposition process is difficult to handle.
[0005] Therefore, the known industrial naphthalene distillation process has the above-mentioned inconveniences and problems. Summary of the invention
[0006] The purpose of the present invention is to provide a single-furnace double-tower device for directly producing industrial naphthalene without washing, which has a simple process, is safe and reliable.
[0007] To achieve the above purpose, the technical solution of the present invention is: A single furnace double tower device for directly producing industrial naphthalene without washing, comprising a primary distillation tower and a rectifying tower, characterized in that: A feed port is provided on the side of the tower body of the primary distillation tower. The mixed portion from the tank area or tar distillation passes through the mixed portion / wash oil heat exchanger and the mixed portion / industrial naphthalene heat exchanger in sequence, exchanges heat with the wash oil and industrial naphthalene, and then enters the primary distillation tower through the feed port; the phenol oil vapor escaping from the top of the primary distillation tower is condensed and cooled by the phenol oil condenser cooler, and then enters the reflux tank of the primary distillation tower; a part of the naphthalene wash oil at the bottom of the primary distillation tower is sent to the reboiler of the primary distillation tower by the primary distillation tower bottom pump, and is sent to the bottom of the primary distillation tower to supply heat to the whole tower after sufficient heat exchange with the industrial naphthalene at the top of the rectifying tower, and the other part is sent to the rectifying tower; The industrial naphthalene vapor escaping from the top of the distillation tower exchanges heat with the naphthalene wash oil at the bottom of the primary distillation tower in the reboiler of the primary distillation tower, enters the mixed portion / industrial naphthalene heat exchanger and the industrial naphthalene cooler, and enters the reflux tank of the distillation tower after further condensation and cooling; the wash oil at the bottom of the distillation tower is returned to the bottom of the distillation tower after a part of the circulating pump at the bottom of the distillation tower is heated by the industrial naphthalene heating furnace to provide heat for the distillation tower, and the other part exchanges heat with the mixed portion in the mixed portion / wash oil heat exchanger, is cooled in the wash oil cooler, and is sent to the finished product tank area for storage; Wherein: the non-condensable gas at the top of the primary distillation tower is pumped out by a liquid ring vacuum pump, so that the primary distillation tower is operated at negative pressure.
[0008] The single-furnace double-tower device for directly producing industrial naphthalene without washing of the present invention can also be further implemented by adopting the following technical measures.
[0009] In the aforementioned single-furnace double-tower device for directly producing industrial naphthalene without washing, a portion of the phenol oil in the reflux tank of the primary distillation tower is sent to the top of the primary distillation tower by a primary distillation tower reflux pump to control the top temperature of the tower, and the remaining phenol oil is sent to the phenol oil tank in the finished product tank area for storage.
[0010] In the aforementioned single-furnace double-tower device for directly producing industrial naphthalene without washing, a portion of the industrial naphthalene in the reflux tank of the distillation tower is sent to the top of the distillation tower by a distillation tower reflux pump to control the top temperature of the tower, and the other portion of the industrial naphthalene is sent to the finished product tank area for storage.
[0011] After adopting the above technical scheme, the single furnace double tower device for directly producing industrial naphthalene without washing of the present invention has the following advantages: 1. Industrial naphthalene distillation uses unwashed mixed parts as raw materials to produce qualified industrial naphthalene. No acid or alkali reagents are added in the whole process, and no additional wastewater is generated; 2. Industrial naphthalene distillation adopts a combination of reduced pressure + normal pressure process. The industrial naphthalene vapor at the top of the distillation tower provides heat source for the primary distillation tower, reducing energy consumption; 3. Full heat exchange between raw materials and products reduces energy consumption. The energy consumption of industrial naphthalene can be reduced to 78Nm 3 Gas / t three-mixed oil. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1This is a process flow chart of a single-furnace double-tower device for directly producing industrial naphthalene without washing according to an embodiment of the present invention. DETAILED DESCRIPTION
[0013] The present invention is further described below in conjunction with embodiments and accompanying drawings.
[0014] Example 1 The single-furnace double-tower device for directly producing industrial naphthalene without washing of the present invention comprises a primary distillation tower and a rectifying tower.
[0015] Please refer to Figure 1 , Figure 1 The process flow chart of the single furnace double tower device for directly producing industrial naphthalene without washing according to the embodiment of the present invention is shown in the figure. As shown in the figure, a feed port is provided on the side of the tower body of the primary distillation tower. The mixed portion from the tank area or tar distillation passes through the mixed portion / wash oil heat exchanger and the mixed portion / industrial naphthalene heat exchanger in sequence, and after heat exchange with the wash oil and industrial naphthalene, enters the primary distillation tower through the feed port; the phenol oil vapor escaping from the top of the primary distillation tower is condensed and cooled by the phenol oil condenser cooler, and then enters the reflux tank of the primary distillation tower; the naphthalene wash oil at the bottom of the primary distillation tower is partially sent to the reboiler of the primary distillation tower by the primary distillation tower bottom pump, and is fully exchanged with the industrial naphthalene at the top of the rectifying tower and sent to the bottom of the primary distillation tower to supply heat to the whole tower, and the other part is sent to the rectifying tower.
[0016] The industrial naphthalene vapor escaping from the top of the distillation tower exchanges heat with the naphthalene wash oil at the bottom of the primary distillation tower in the reboiler of the primary distillation tower, enters the mixed portion / industrial naphthalene heat exchanger and the industrial naphthalene cooler, and enters the reflux tank of the distillation tower after further condensation and cooling; the wash oil at the bottom of the distillation tower is returned to the bottom of the distillation tower after a part of the circulating pump at the bottom of the distillation tower is heated by the industrial naphthalene heating furnace to provide heat for the distillation tower, and the other part exchanges heat with the mixed portion in the mixed portion / wash oil heat exchanger, is cooled in the wash oil cooler, and is sent to the finished product tank area for storage; Wherein: the non-condensable gas at the top of the primary distillation tower is pumped out by a liquid ring vacuum pump, so that the primary distillation tower is operated at negative pressure.
[0017] The present invention has substantial characteristics and significant technical progress. The single furnace double tower device for directly producing industrial naphthalene without washing of the present invention is the best process choice to solve the sodium sulfate waste liquid that is difficult to handle generated during the washing and decomposition process, eliminate the washing section, simplify the tar processing process, and reduce the generation of waste liquid. Through the corrosion of the unwashed mixed portion, it is found that the corrosion has certain rules and is closely related to the equipment and pipeline materials, process flow, operating temperature, pressure and operation mode. The single furnace double tower device for directly producing industrial naphthalene without washing of the present invention uses the industrial naphthalene distillation of the unwashed mixed portion as raw material to produce qualified industrial naphthalene. The whole process does not add any acid and alkali reagents, and no new wastewater is generated; the industrial naphthalene distillation adopts a combined process of reduced pressure + normal pressure. The industrial naphthalene vapor at the top of the distillation tower provides a heat source for the primary distillation tower, reducing energy consumption. The raw materials and products fully exchange heat to reduce energy consumption.
[0018] The single furnace double tower device for direct production of industrial naphthalene without washing is used in the industrial naphthalene project of Baotou Baokai Carbon Material Co., Ltd. with remarkable effect. The energy consumption of industrial naphthalene can be reduced to 78Nm 3 Gas / t three-mixed oil.
[0019] The above embodiments are only for the purpose of illustrating the present invention, but not for limiting the present invention. A person skilled in the art may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention and should be defined by the claims.
Claims
1. A single furnace double tower device for directly producing industrial naphthalene without washing, comprising a primary distillation tower and a rectifying tower, characterized in that: A feed port is provided on the side of the tower body of the primary distillation tower. The mixed portion from the tank area or tar distillation passes through the mixed portion / wash oil heat exchanger and the mixed portion / industrial naphthalene heat exchanger in sequence, exchanges heat with the wash oil and industrial naphthalene, and then enters the primary distillation tower through the feed port; the phenol oil vapor escaping from the top of the primary distillation tower is condensed and cooled by the phenol oil condenser cooler, and then enters the reflux tank of the primary distillation tower; a part of the naphthalene wash oil at the bottom of the primary distillation tower is sent to the reboiler of the primary distillation tower by the primary distillation tower bottom pump, and is sent to the bottom of the primary distillation tower to supply heat to the whole tower after sufficient heat exchange with the industrial naphthalene at the top of the rectifying tower, and the other part is sent to the rectifying tower; The industrial naphthalene vapor escaping from the top of the distillation tower exchanges heat with the naphthalene wash oil at the bottom of the primary distillation tower in the reboiler of the primary distillation tower, enters the mixed portion / industrial naphthalene heat exchanger and the industrial naphthalene cooler, and enters the reflux tank of the distillation tower after further condensation and cooling; the wash oil at the bottom of the distillation tower is returned to the bottom of the distillation tower after a part of the circulating pump at the bottom of the distillation tower is heated by the industrial naphthalene heating furnace to provide heat for the distillation tower, and the other part exchanges heat with the mixed portion in the mixed portion / wash oil heat exchanger, is cooled in the wash oil cooler, and is sent to the finished product tank area for storage; Wherein: the non-condensable gas at the top of the primary distillation tower is pumped out by a liquid ring vacuum pump, so that the primary distillation tower is operated at negative pressure.
2. The single furnace double tower device for directly producing industrial naphthalene without washing as claimed in claim 1, characterized in that: A portion of the phenol oil in the reflux tank of the primary distillation tower is sent to the top of the primary distillation tower by a primary distillation tower reflux pump to control the top temperature, and the remaining phenol oil is sent to the phenol oil tank in the finished product tank area for storage.
3. The single furnace double tower device for directly producing industrial naphthalene without washing as claimed in claim 1, characterized in that: A part of the industrial naphthalene in the reflux tank of the distillation tower is sent to the top of the distillation tower by a distillation tower reflux pump to control the top temperature of the tower, and the other part of the industrial naphthalene is sent to the finished product tank area for storage.