Batch rectification device for n-butyl alcohol dehydration

Abstract

The batch rectification device comprises a feeding pump, a reboiler, a rectification tower, a condenser, a first phase splitter, a water phase receiving tank, a reflux tank, a transition tank, an n-butyl alcohol tank, a second phase splitter and an organic phase receiving tank, the second phase splitter and the rectifying tower are adopted to treat wastewater generated after n-butyl alcohol is dehydrated, the content of n-butyl alcohol in the wastewater is reduced, the wastewater meets the feeding requirement of a sewage treatment system, convenience and rapidness are achieved, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of n-butanol dehydration and distillation devices, in particular to an intermittent distillation device for n-butanol dehydration. Background Art

[0002] n-Butanol is a colorless liquid with an alcoholic odor. It has a boiling point of 117.7°C and is slightly soluble in water. It is a solvent for a variety of coatings and a raw material for making the plasticizer dibutyl phthalate (see phthalates). It is also used to make butyl acrylate, butyl acetate, ethylene glycol butyl ether, as an organic synthesis intermediate and an extractant for biochemical drugs. It is also used to make surfactants.

[0003] In the prior art, after dehydration of n-butanol, wastewater containing n-butanol is formed. Wastewater containing a high amount of n-butanol cannot be directly introduced into the sewage treatment system. The wastewater needs to be treated by other equipment to reduce the n-butanol content in the wastewater to a level that can be discharged into the sewage treatment system. This not only increases the process equipment, but is also not conducive to improving the process efficiency. Utility Model Content

[0004] The utility model aims to provide an intermittent distillation device for dehydrating n-butanol, which can not only dehydrate n-butanol but also treat residual waste water so that the waste water can meet the requirements for entering a sewage treatment system.

[0005] In order to achieve the above object, an intermittent distillation device for dehydrating n-butanol is provided, comprising a feed pump, a reboiler, a distillation tower, a condenser, a first phase separator, a water phase receiving tank, a reflux tank, a transition tank, a n-butanol tank, a second phase separator, and an organic phase receiving tank; the feed pump is connected to the reboiler, the reboiler is connected to the distillation tower, and the distillation tower is connected to the condenser;

[0006] The condenser is connected to the first phase separator, the reflux tank and the second phase separator respectively, the first phase separator is connected to the first reflux pump, the first reflux pump is connected to the top of the distillation tower, the first phase separator is connected to the water phase extraction pump, the water phase extraction pump is connected to the water phase receiving tank, and the water phase receiving tank is connected to the reboiler;

[0007] The reflux tank is connected to the reflux tank extraction pump and the second reflux pump respectively, the reflux extraction pump is connected to the transition tank and the n-butanol tank respectively, the transition tank is connected to the reboiler, and the second reflux pump is connected to the top of the distillation tower;

[0008] The second phase separator is connected to the third reflux pump and the organic phase extraction pump respectively, the third reflux pump is connected to the top of the distillation tower, the organic phase extraction pump is connected to the organic phase receiving tank, and the organic phase receiving tank is connected to the reboiler.

[0009] Further, the feed pump is connected to the reboiler through a pipeline with a valve, the reboiler is connected to the distillation tower through a pipeline, and the distillation tower is connected to the condenser through a pipeline;

[0010] The condenser is connected to the first phase separator, the reflux tank and the second phase separator respectively through pipelines with valves, the first phase separator is connected to the first reflux pump through a pipeline, the first reflux pump is connected to the top of the distillation tower through a pipeline with a valve, the first phase separator is connected to the water phase extraction pump through a pipeline with a valve, the water phase extraction pump is connected to the water phase receiving tank through a pipeline, and the water phase receiving tank is connected to the reboiler through a pipeline with a valve;

[0011] The reflux tank is connected to the reflux tank extraction pump and the second reflux pump respectively through pipelines with valves, the reflux extraction pump is connected to the transition tank and the n-butanol tank respectively through pipelines with valves, the transition tank is connected to the reboiler through a pipeline with a valve, and the second reflux pump is connected to the top of the distillation tower through a pipeline with a valve;

[0012] The second phase separator is connected to the third reflux pump and the organic phase extraction pump respectively through pipelines with valves, the third reflux pump is connected to the top of the distillation tower through a pipeline with a valve, the organic phase extraction pump is connected to the organic phase receiving tank through a pipeline with a valve, and the organic phase receiving tank is connected to the reboiler through a pipeline with a valve.

[0013] Beneficial effects:

[0014] The utility model adopts a second phase separator and a distillation tower to process wastewater generated after dehydration of n-butanol, reduces the content of n-butanol in the wastewater, and makes the wastewater meet the feeding requirements of the sewage treatment system. There is no need to move the wastewater to other equipment for further treatment, which is convenient and fast and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of an intermittent distillation device for dehydration of n-butanol proposed by the utility model;

[0016] Legend:

[0017] 1. Feed pump; 2. Reboiler; 3. Distillation tower; 4. Condenser; 5. First phase separator; 6. First reflux pump; 7. Water phase extraction pump; 8. Water phase receiving tank; 9. Reflux tank; 10. Second reflux pump; 11. Reflux tank extraction pump; 12. Transition tank; 13. n-butanol tank; 14. Second phase separator; 15. Third reflux pump; 16. Organic phase extraction pump; 17. Organic phase receiving tank. DETAILED DESCRIPTION

[0018] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0019] Reference Figure 1 The utility model embodiment is an intermittent distillation device for dehydrating n-butanol, comprising a feed pump 1, a reboiler 2, a distillation tower 3, a condenser 4, a first phase separator 5, a first reflux pump 6, a water phase extraction pump 7, a water phase receiving tank 8, a reflux tank 9, a second reflux pump 10, a reflux tank extraction pump 11, a transition tank 12, a n-butanol tank 13, a second phase separator 14, a third reflux pump 15, an organic phase extraction pump 16, and an organic phase receiving tank 17.

[0020] The feed pump 1 is connected to the reboiler 2 through a pipeline with a valve, the reboiler 2 is connected to the distillation tower 3 through a pipeline, and the distillation tower 3 is connected to the condenser 4 through a pipeline;

[0021] The condenser 4 is connected to the first phase separator 5, the reflux tank 9 and the second phase separator 14 respectively through pipelines with valves, the first phase separator 5 is connected to the first reflux pump 6 through a pipeline, the first reflux pump 6 is connected to the top of the distillation tower 3 through a pipeline with a valve, the first phase separator 5 is connected to the water phase extraction pump 7 through a pipeline with a valve, the water phase extraction pump 7 is connected to the water phase receiving tank 8 through a pipeline, and the water phase receiving tank 8 is connected to the reboiler 2 through a pipeline with a valve;

[0022] The reflux tank 9 is connected to the reflux tank extraction pump 11 and the second reflux pump 10 respectively through pipelines with valves, the reflux extraction pump 11 is connected to the transition tank 12 and the n-butanol tank 13 respectively through pipelines with valves, the transition tank 12 is connected to the reboiler 2 through a pipeline with a valve, and the second reflux pump 10 is connected to the top of the distillation tower 3 through a pipeline with a valve;

[0023] The second phase separator 14 is connected to the third reflux pump 15 and the organic phase extraction pump 16 respectively through pipelines with valves, the third reflux pump 15 is connected to the top of the distillation tower 3 through a pipeline with a valve, the organic phase extraction pump 16 is connected to the organic phase receiving tank 17 through a pipeline with a valve, and the organic phase receiving tank 17 is connected to the reboiler 2 through a pipeline with a valve.

[0024] Working principle:

[0025] First stage operation: The water-n-butanol solution raw material is pumped into the reboiler 2 at one time by the feed pump 1. After being heated in the reboiler 2, the n-butanol and water are vaporized and enter the distillation tower 3. In the distillation tower 3, the gas phase and liquid phase of the n-butanol and water transfer mass and heat, and an azeotrope of n-butanol and water is formed at the top of the distillation tower 3. After the azeotrope at the top of the distillation tower 3 is condensed by the condenser 4, the condensate first enters the first phase separator 5, and the liquid mixture in the first phase separator 5 is divided into an upper organic phase and a lower aqueous phase. The upper organic phase is returned to the distillation tower 3 from the top of the distillation tower 3 through the first reflux pump 6, and the lower aqueous phase is pumped into the aqueous phase receiving tank 8 for temporary storage through the aqueous phase extraction pump 7; secondly, after the water content of n-butanol in the bottom of the distillation tower 3 reaches the requirement, the condenser 4 is switched to the reflux tank 9, and part of the condensate is returned to the distillation tower 3 from the top of the distillation tower 3 through the second reflux pump 10, and the remaining condensate is pumped into the transition tank 12 for temporary storage through the reflux tank extraction pump 11; finally, after the n-butanol content of the condensate in the reflux tank 9 is increased to the requirement, the n-butanol is sent to the n-butanol tank 13, and the first stage operation is completed after the n-butanol is collected.

[0026] Second stage operation: After the first stage operation is completed, the n-butanol content in the water phase of the water phase receiving tank 8 is relatively high and cannot be directly discharged. The water phase temporarily stored in the water phase receiving tank 8 is placed in the reboiler 2 for the second stage operation. After the water phase placed in the reboiler 2 is heated by the reboiler 2, the n-butanol and water are vaporized and enter the distillation tower 3. In the distillation tower 3, the gas phase and liquid phase of the n-butanol and water transfer mass and heat, and an azeotrope of n-butanol and water is formed at the top of the distillation tower 3. After the azeotrope at the top of the distillation tower 3 is condensed by the condenser 4, the condensate first enters the second phase separator 14, and the liquid mixture in the second phase separator 14 is divided into an upper organic phase and a lower aqueous phase, and the lower aqueous phase is returned to the distillation tower 3 from the top of the distillation tower 3 through the third reflux pump 15, and the upper organic phase is pumped into the organic phase receiving tank 17 for temporary storage through the organic phase extraction pump 16; after the waste water from the bottom of the distillation tower 3 meets the requirements, the condensate is switched to the reflux tank 9, and part of the condensate is returned to the distillation tower 3 from the top of the distillation tower 3 through the second reflux pump 10, and the remaining condensate is pumped into the transition tank 12 for temporary storage through the reflux tank extraction pump 11, and after the n-butanol content of the condensate in the reflux tank 9 drops to the requirement, the aqueous phase treatment is completed, and the second stage operation is ended.

[0027] After the wastewater in the reboiler 2 is cooled, the wastewater is discharged, and then all the temporary storage liquid in the transition tank 12 is put into the reboiler 2, mixed with the next batch of water-n-butanol solution raw materials, and the next batch of dehydration treatment is carried out.

[0028] The utility model adopts the second phase separator 14 and the distillation tower 3 to treat the wastewater generated after the dehydration of n-butanol, reduces the content of n-butanol in the wastewater, and makes the wastewater meet the feeding requirements of the sewage treatment system. There is no need to move the wastewater to other equipment for further treatment, which is convenient and fast and improves work efficiency.

[0029] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. An intermittent distillation device for dehydrating n-butanol, comprising a feed pump, a reboiler, a distillation tower, a condenser, a first phase separator, a water phase receiving tank, a reflux tank, a transition tank, and an n-butanol tank. It is characterized in that It also includes a second phase separator and an organic phase receiving tank; the feed pump is connected to the reboiler, the reboiler is connected to the distillation tower, and the distillation tower is connected to the condenser; The condenser is connected to the first phase separator, the reflux tank and the second phase separator respectively, the first phase separator is connected to the first reflux pump, the first reflux pump is connected to the top of the distillation tower, the first phase separator is connected to the water phase extraction pump, the water phase extraction pump is connected to the water phase receiving tank, and the water phase receiving tank is connected to the reboiler; The reflux tank is connected to the reflux tank extraction pump and the second reflux pump respectively, the reflux tank extraction pump is connected to the transition tank and the n-butanol tank respectively, the transition tank is connected to the reboiler, and the second reflux pump is connected to the top of the distillation tower; The second phase separator is connected to the third reflux pump and the organic phase extraction pump respectively, the third reflux pump is connected to the top of the distillation tower, the organic phase extraction pump is connected to the organic phase receiving tank, and the organic phase receiving tank is connected to the reboiler.

2. A batch distillation device for dehydrating n-butanol according to claim 1, It is characterized in that The feed pump is connected to the reboiler through a pipeline with a valve, the reboiler is connected to the distillation tower through a pipeline, and the distillation tower is connected to the condenser through a pipeline; The condenser is connected to the first phase separator, the reflux tank and the second phase separator respectively through pipelines with valves, the first phase separator is connected to the first reflux pump through a pipeline, the first reflux pump is connected to the top of the distillation tower through a pipeline with a valve, the first phase separator is connected to the water phase extraction pump through a pipeline with a valve, the water phase extraction pump is connected to the water phase receiving tank through a pipeline, and the water phase receiving tank is connected to the reboiler through a pipeline with a valve; The reflux tank is connected to the reflux tank extraction pump and the second reflux pump respectively through pipelines with valves, the reflux tank extraction pump is connected to the transition tank and the n-butanol tank respectively through pipelines with valves, the transition tank is connected to the reboiler through a pipeline with a valve, and the second reflux pump is connected to the top of the distillation tower through a pipeline with a valve; The second phase separator is connected to the third reflux pump and the organic phase extraction pump respectively through pipelines with valves, the third reflux pump is connected to the top of the distillation tower through a pipeline with a valve, the organic phase extraction pump is connected to the organic phase receiving tank through a pipeline with a valve, and the organic phase receiving tank is connected to the reboiler through a pipeline with a valve.

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