Hydrochloric acid resolving device

Abstract

The utility model relates to the technical field of hydrochloric acid desorption, in particular to a hydrochloric acid desorption device which comprises a hydrochloric acid desorption tower, and the top of the hydrochloric acid desorption tower is sequentially communicated with a primary condensing device, a secondary condensing device, a freezing device, a demister and a hydrogen chloride buffer tank; one side wall of the hydrochloric acid desorption tower is communicated with a hydrochloric acid storage tank; the side wall of the hydrochloric acid desorption tower is also communicated with a calcium chloride solution storage tank; a bottom liquid outlet of the hydrochloric acid desorption tower is communicated with a first inlet of the thermosyphon reboiler, the thermosyphon reboiler is provided with a first outlet and a second outlet, the first outlet is communicated with a liquid inlet of the hydrochloric acid desorption tower, and the second outlet is sequentially communicated with the multi-effect evaporation device and the flash separation tank; and the flash separation tank is respectively communicated with a calcium chloride solution storage tank and a second inlet of the thermosyphon type reboiler. According to the utility model, the equipment investment is reduced, the concentration efficiency of the calcium chloride solution is improved, the energy consumption is reduced, and calcium chloride is prevented from flowing back into the desorption tower to cause blockage.

Description

TECHNICAL FIELD

[0001] The utility model relates to a hydrochloric acid analysis technical field, specifically relates to a hydrochloric acid analysis device. BACKGROUND

[0002] Potassium sulfate is an important non-chlorine potassium fertilizer in agriculture, and is one of the sources of sulfur element supplement in crops. At present, potassium sulfate is mainly prepared by the following three methods in industry: the first method is to prepare potassium sulfate by using sulfuric acid decomposition, such as Mannheim method, sulfuric acid setting method; the second method is to prepare potassium sulfate by using sulfate double decomposition, such as ammoniation method magnesium sulfate method, mirabilite method, ammonium sulfate method and soft potassium magnesium vanadium method; the third method is to prepare potassium sulfate by using salt lake brine and underground brine. Among them, the method of preparing potassium sulfate by using sulfuric acid decomposition and the method of preparing potassium sulfate by using sulfate double decomposition may produce by-product hydrochloric acid. The by-product hydrochloric acid contains impurities such as sulfate, which limits its use.

[0003] In order to improve the utilization rate of by-product hydrochloric acid, the hydrochloric acid analysis process is usually used to extract hydrogen chloride from by-product hydrochloric acid. The currently mature hydrochloric acid analysis process mainly includes sulfuric acid extraction distillation method, calcium chloride extraction distillation method and pressure swing distillation method (pressure difference method). Among them, the calcium chloride extraction distillation method is a method for separating hydrogen chloride gas by adding calcium chloride to hydrochloric acid to break the azeotropic point limitation. This method can effectively remove impurities and other components in hydrochloric acid, but there is a problem of calcium chloride scaling and plugging the analysis tower. The existing technology uses supergravity analysis tower to improve the mixing effect of calcium chloride and hydrochloric acid, thereby reducing the scaling of calcium chloride in the analysis tower. Although this device can reduce the precipitation of calcium chloride to some extent, it has large equipment investment, high energy consumption, and cannot avoid the precipitation of calcium chloride in the evaporation and concentration process, which causes plugging when returning to the analysis tower. UTILITY MODEL CONTENTS

[0004] In view of the problem of calcium chloride scaling and plugging the analysis tower in the existing hydrochloric acid analysis process, the utility model provides a hydrochloric acid analysis device. The heat siphon type reboiler is used to heat the mixed liquid in the hydrochloric acid analysis tower and preheat the mixed liquid entering the multi-effect evaporation device at the same time, which reduces the equipment investment, improves the concentration efficiency of calcium chloride solution, and reduces the energy consumption. The flash separation tank is used to settle the precipitated calcium chloride in the calcium chloride concentration liquid, so as to avoid the precipitation of calcium chloride in the evaporation and concentration process and the return to the analysis tower to cause plugging.

[0005] The utility model technical scheme is as follows:

[0006] The hydrochloric acid resolving device comprises a hydrochloric acid resolving tower, a first-stage condensing device, a second-stage condensing device, a refrigerating device, a mist eliminator and a hydrogen chloride buffer tank are sequentially connected with the top of the hydrochloric acid resolving tower; a side wall of the hydrochloric acid resolving tower is connected with a hydrochloric acid storage tank; the side wall of the hydrochloric acid resolving tower is also connected with a calcium chloride solution storage tank; a liquid outlet at the bottom of the hydrochloric acid resolving tower is connected with a first inlet of a thermosyphon reboiler; the thermosyphon reboiler is provided with a first outlet and a second outlet; the first outlet is connected with a liquid inlet of the hydrochloric acid resolving tower; the second outlet is sequentially connected with a multi-effect evaporation device and a flash separation tank; the flash separation tank is connected with the calcium chloride solution storage tank and a second inlet of the thermosyphon reboiler respectively.

[0007] Further, the hydrogen chloride buffer tank is connected with an original trimethyl acetate salt forming kettle.

[0008] Further, the upper end side wall of the hydrochloric acid resolving tower is connected with the hydrochloric acid storage tank.

[0009] Further, a preheater is arranged between the upper end side wall of the hydrochloric acid resolving tower and the hydrochloric acid storage tank.

[0010] Further, the multi-effect evaporation device is a two-effect evaporation device.

[0011] Further, the two-effect evaporation device comprises a first heating chamber and a second heating chamber.

[0012] Further, the second heating chamber is connected with a condensing device, and the condensing device is connected with a wastewater tank.

[0013] Further, the bottom of the flash separation tank is provided with a cleaning port.

[0014] Further, the hydrochloric acid resolving tower is a tubular resolving tower.

[0015] The hydrochloric acid resolving device comprises a hydrochloric acid resolving tower, a first-stage condensing device, a second-stage condensing device, a refrigerating device, a mist eliminator and a hydrogen chloride buffer tank are sequentially connected with the top of the hydrochloric acid resolving tower; a side wall of the hydrochloric acid resolving tower is connected with a hydrochloric acid storage tank; the side wall of the hydrochloric acid resolving tower is also connected with a calcium chloride solution storage tank; a liquid outlet at the bottom of the hydrochloric acid resolving tower is connected with a first inlet of a thermosyphon reboiler; the thermosyphon reboiler is provided with a first outlet and a second outlet; the first outlet is connected with a liquid inlet of the hydrochloric acid resolving tower; the second outlet is sequentially connected with a multi-effect evaporation device and a flash separation tank; the flash separation tank is connected with the calcium chloride solution storage tank and a second inlet of the thermosyphon reboiler respectively.

[0016] The hydrochloric acid analysis device is characterized in that the top of the hydrochloric acid analysis tower is sequentially connected with a first condensing device, a second condensing device, a refrigerating device, a mist eliminator and a hydrogen chloride buffer tank, water vapor doped in hydrogen chloride gas is graded condensed into liquid water by the first condensing device and the second condensing device, the liquid water is converted into solid water by the refrigerating device, and the solid water is separated from the hydrogen chloride gas by the mist eliminator, so that the purity of the hydrogen chloride gas is improved; the mixed liquid in the hydrochloric acid analysis tower is heated and the mixed liquid entering the multi-effect evaporation device is preheated at the same time by the thermosyphon reboiler, so that the concentration efficiency of the calcium chloride solution is improved while the equipment investment is reduced, and the energy consumption is reduced; the calcium chloride separated out from the calcium chloride concentrated liquid is settled by the flash evaporation separation tank, so that the calcium chloride separated out in the evaporation and concentration process is prevented from flowing back into the analysis tower and causing blockage. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0018] Figure 1 It is a structural schematic view of the hydrochloric acid analysis device.

[0019] In the figure, 1 is a hydrochloric acid analysis tower, 2 is a first condensing device, 3 is a second condensing device, 4 is a refrigerating device, 5 is a high-efficiency mist eliminator, 6 is a hydrogen chloride buffer tank, 7 is a trimethyl orthoacetate salting kettle, 8 is a hydrochloric acid storage tank, 9 is a preheater, 10 is a calcium chloride solution storage tank, 11 is a thermosyphon reboiler, 12 is a one-effect heating chamber, 13 is a two-effect heating chamber, 14 is a condensing device, 15 is a wastewater tank, and 16 is a flash evaporation separation tank. DETAILED DESCRIPTION

[0020] In order to make the personnel in the technical field better understand the technical solutions in the present application, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without any creative effort should belong to the protection scope of the present application.

[0021] Embodiment 1

[0022] The application relates to a hydrochloric acid resolving device, which comprises a hydrochloric acid resolving tower 1, wherein the hydrochloric acid resolving tower 1 is a column-tube type resolving tower. The top exhaust port of the hydrochloric acid resolving tower 1 is sequentially connected with a first-stage condensing device 2, a second-stage condensing device 3, a refrigerating device 4, a high-efficiency demister 5 and a hydrogen chloride buffer tank 6 through pipelines, and the hydrogen chloride buffer tank 6 is connected with an original acetic acid trimethyl ester salt forming kettle 7 through a pipeline. A hydrochloric acid feeding port is arranged on the upper end side wall of the hydrochloric acid resolving tower 1, the hydrochloric acid feeding port is connected with the outlet of a preheater 9 through a pipeline, the inlet of the preheater 9 is connected with a hydrochloric acid storage tank 8 through a pipeline, and a hydrochloric acid pressurizing pump is arranged on the pipeline between the inlet of the preheater 9 and the hydrochloric acid storage tank 8.

[0023] A calcium chloride solution feeding port is arranged on the middle side wall of the hydrochloric acid resolving tower 1, the calcium chloride solution feeding port is connected with a calcium chloride solution storage tank 10 through a pipeline, and a calcium chloride solution circulating pump is arranged on the pipeline between the calcium chloride solution feeding port and the calcium chloride solution storage tank 10. The bottom liquid outlet of the hydrochloric acid resolving tower 1 is connected with the first inlet of a thermosyphon type reboiler 11 through a pipeline, the thermosyphon type reboiler 11 is provided with a first outlet and a second outlet, the first outlet is connected with the liquid inlet of the hydrochloric acid resolving tower 1 through a pipeline, and the second outlet is sequentially connected with a first-stage heating chamber 12, a second-stage heating chamber 13 and a flash separation tank 16 through pipelines. The heat source of the first-stage heating chamber 12 is fresh steam from a heat company, the heat source of the second-stage heating chamber 13 is secondary steam flashed out of the first-stage heating chamber 12, the flash separation tank 16 is provided with a first discharge port and a second discharge port, the first discharge port is connected with the calcium chloride solution storage tank 10 through a pipeline, the second discharge port is connected with the second inlet of the thermosyphon type reboiler 11 through a pipeline, and a cleaning port is arranged on the bottom of the flash separation tank 16 for taking out the sediment. The steam outlet of the second-stage heating chamber 13 is connected with a condensing device 14 through a pipeline, and the condensing device 14 is connected with a wastewater tank 15.

[0024] Working principle: the calcium chloride solution circulating pump is used to pump the calcium chloride solution with a concentration of 40wt%-45wt% into the hydrochloric acid stripping tower, the hot siphon reboiler is used to heat the calcium chloride solution in the hydrochloric acid stripping tower, when the temperature of the calcium chloride solution in the hydrochloric acid stripping tower reaches 140-150℃, the hydrochloric acid pressurizing pump is used to pump the hydrochloric acid with a concentration of 31wt% into the hydrochloric acid stripping tower, the calcium chloride solution and the hydrochloric acid flow downwards and mix under the action of gravity, the solution reaching the bottom of the hydrochloric acid stripping tower is heated by the hot siphon reboiler, the temperature in the hydrochloric acid stripping tower is controlled to be 130-148℃, the hydrogen chloride gas generated by the stripping is separated by distillation and rises to the top of the hydrochloric acid stripping tower, and is sequentially introduced into the primary condensing device and the secondary condensing device through the exhaust port at the top of the hydrochloric acid stripping tower to reduce pressure and temperature, so that the water vapor in the hydrogen chloride gas is condensed into liquid drops and separated out, wherein the condensing temperature of the primary condensing device and the secondary condensing device is 10-15℃, and the pressure is 0.0035MPa, the hydrogen chloride gas enters the refrigeration device from the secondary condensing device to be further dehydrated and dried, and then passes through the high-efficiency demister, wherein the temperature of the refrigeration device is-10℃, and the pressure is-0.0026MPa. The hydrogen chloride gas after demisting is introduced into the hydrogen chloride buffer tank and temporarily stored as raw material for the original acetic acid trimethyl ester salification reaction.

[0025] The calcium chloride diluent with a concentration of 36wt%-40wt% discharged from the bottom of the hydrochloric acid stripping tower is sequentially introduced into the primary heating chamber and the secondary heating chamber through the hot siphon reboiler to evaporate and concentrate, the low-temperature steam with a temperature of 70-90℃ flashed out from the secondary heating chamber is cooled by the condensing device and then introduced into the wastewater tank, the temperature of the condensing device is controlled to be 0-26℃, the calcium chloride concentrated solution obtained by flashing the secondary heating chamber is introduced into the flash separation tank to settle, and the precipitated calcium chloride, calcium sulfate and other water-insoluble impurities are removed, the calcium chloride concentrated solution after the settlement treatment can be recycled into the hydrochloric acid stripping tower through the hot siphon reboiler or can be transported to the calcium chloride solution storage tank for storage, and the precipitated calcium chloride, calcium sulfate and other water-insoluble impurities in the flash separation tank can be taken out through the cleaning port for reuse.

[0026] Although the utility model has been described in detail by referring to the drawings and combining the preferred embodiments, the utility model is not limited to this. The ordinary skilled in the art can make various equivalent modifications or replacements to the embodiments of the utility model without departing from the spirit and essence of the utility model, and these modifications or replacements should be within the scope of the utility model. Any skilled in the art within the technical range disclosed by the utility model can easily think of changes or replacements, which should be within the protection scope of the utility model.

Claims

1. A hydrochloric acid resolution apparatus comprising a hydrochloric acid resolution column, characterized by, The top of the hydrochloric acid resolving tower is connected with a first-stage condensing device, a second-stage condensing device, a refrigerating device, a mist eliminator and a hydrogen chloride buffer tank in sequence; one side wall of the hydrochloric acid resolving tower is connected with a hydrochloric acid storage tank; the side wall of the hydrochloric acid resolving tower is also connected with a calcium chloride solution storage tank; the bottom liquid outlet of the hydrochloric acid resolving tower is connected with a first inlet of a thermosyphon reboiler; the thermosyphon reboiler is provided with a first outlet and a second outlet; the first outlet is connected with a liquid inlet of the hydrochloric acid resolving tower; the second outlet is connected with a multi-effect evaporation device and a flash separation tank in sequence; the flash separation tank is connected with the calcium chloride solution storage tank and a second inlet of the thermosyphon reboiler respectively.

2. The hydrochloric acid resolution apparatus of claim 1, wherein The hydrogen chloride buffer tank is connected with an original acetic acid trimethyl ester salt forming kettle.

3. The hydrochloric acid resolution apparatus of claim 1, wherein The upper end side wall of the hydrochloric acid resolving tower is connected with the hydrochloric acid storage tank.

4. The hydrochloric acid resolution apparatus of claim 3, wherein A preheater is arranged between the upper end side wall of the hydrochloric acid resolving tower and the hydrochloric acid storage tank.

5. The hydrochloric acid resolution apparatus of claim 1, wherein The multi-effect evaporation device is a two-effect evaporation device.

6. The hydrochloric acid resolution apparatus of claim 5, wherein The two-effect evaporation device comprises a first-effect heating chamber and a second-effect heating chamber; the heat source of the first-effect heating chamber is fresh steam.

7. The hydrochloric acid resolution apparatus of claim 6, wherein The second-effect heating chamber is connected with a condensing device; the condensing device is connected with a wastewater tank.

8. The hydrochloric acid resolution apparatus of claim 1, wherein A cleaning port is arranged at the bottom of the flash separation tank.

9. The hydrochloric acid resolution apparatus of claim 1, wherein The hydrochloric acid resolving tower is a tube-type resolving tower.

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