A device for separating byproduct hydrochloric acid by vacuum stripping

Abstract

The utility model discloses a kind of sulfonated by-product hydrochloric acid vacuum stripping separation devices, including sequentially connected raw material hydrochloric acid tank, dichloro dechlorination tower, HCl washing tower, tail gas buffer tank, water ring vacuum unit, waste liquid storage tank and raw lye washing water storage tank;The tower kettle of dichloro dechlorination tower is connected with hydrochloric acid heater, the top of dichloro dechlorination tower is connected with first hydrochloric acid cooler, and first hydrochloric acid cooler is connected with finished product hydrochloric acid tank;The HCl washing tower is respectively connected with second hydrochloric acid cooler and liquid alkali storage tank, and liquid alkali storage tank is connected with process wastewater pool.The utility model provides a kind of sulfonated by-product hydrochloric acid vacuum stripping separation device, by heating stripping of raw material hydrochloric acid in dichloro dechlorination tower, washing and caustic washing etc. a series of processes of HCl washing tower, with the aid of vacuum system guarantee two-phase separation, not only can efficiently separate dichloromethane etc. organic solvent impurities in by-product hydrochloric acid, significantly improve the purity of hydrochloric acid, realize the resource utilization of by-product hydrochloric acid.

Description

Technical Field

[0001] This utility model relates to the technical field, specifically to a vacuum stripping and separation device for hydrochloric acid, a byproduct of sulfonation. Background Technology

[0002] During the sulfonation process, hydrochloric acid is often produced as a byproduct. This byproduct hydrochloric acid usually contains organic solvent impurities such as dichloromethane, which makes it difficult for the quality of the byproduct hydrochloric acid to meet the industrial demand for high-purity hydrochloric acid, limiting its direct application in many fields, and also causing waste of resources and potential environmental problems.

[0003] Traditional hydrochloric acid purification methods, such as simple distillation, have many drawbacks. On the one hand, distillation is energy-intensive, requiring a large amount of energy. On the other hand, for impurities like dichloromethane, which form azeotropes with hydrochloric acid or have unique solubility, the separation effect is not ideal, making it difficult to effectively remove impurities and obtain high-purity hydrochloric acid products. Furthermore, the waste gas and wastewater containing impurities generated during the separation process, if not properly treated, can pollute the environment, failing to meet the requirements of green chemical engineering development.

[0004] Based on the above, this utility model proposes a vacuum stripping separation device for sulfonation by-product hydrochloric acid, which can effectively solve the above problems. Utility Model Content

[0005] This invention addresses the shortcomings of the existing technology by providing a vacuum stripping and separation device for hydrochloric acid produced as a byproduct of sulfonation.

[0006] This utility model is achieved through the following technical solution: A vacuum stripping and separation device for hydrochloric acid as a byproduct of sulfonation includes a raw hydrochloric acid tank, a dichlorination dechlorination tower, an HCl washing tower, a tail gas buffer tank, a water ring vacuum unit, a waste liquid storage tank, and a raw alkali wash water storage tank connected in sequence. The bottom of the dichlorination dechlorination tower is connected to a hydrochloric acid heater, and the top of the dichlorination dechlorination tower is connected to a first hydrochloric acid cooler, which is connected to the finished hydrochloric acid tank. The HCl washing tower is connected to a second hydrochloric acid cooler and a liquid alkali storage tank, which is connected to the wastewater pool of the process section.

[0007] According to the above technical solution, as a further preferred technical solution, the second hydrochloric acid cooler is connected to the dichlorination dechlorination tower through the first reflux pipe.

[0008] According to the above technical solution, as a further preferred technical solution, the liquid alkali storage tank is connected to the HCl washing tower through a second reflux pipe.

[0009] According to the above technical solution, as a further preferred technical solution, the water ring vacuum unit, waste liquid storage tank and liquid alkali storage tank are all connected to the tail gas external pipe.

[0010] Compared with the prior art, this utility model has the following advantages and beneficial effects: This utility model provides a vacuum stripping separation device for sulfonated by-product hydrochloric acid. Through a series of processes such as heating and stripping of raw hydrochloric acid in a dichlorodechlorination tower, washing and alkaline washing in an HCl washing tower, and ensuring two-phase separation with the help of a vacuum system, it can not only efficiently separate organic solvent impurities such as dichloromethane in by-product hydrochloric acid, but also significantly improve the purity of hydrochloric acid and realize the resource utilization of by-product hydrochloric acid. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model. Detailed Implementation

[0012] To enable those skilled in the art to better understand the technical solution of this utility model, the preferred embodiments of this utility model are described below in conjunction with specific examples. However, it should be understood that the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. For better illustration of this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable that some well-known structures and their descriptions may be omitted in the drawings for those skilled in the art. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0013] A vacuum stripping and separation device for hydrochloric acid as a byproduct of sulfonation includes a raw hydrochloric acid tank 1, a dichlorination dechlorination tower 2, an HCl washing tower 3, a tail gas buffer tank 4, a water ring vacuum unit 5, a waste liquid storage tank 6, and a raw alkali washing water storage tank 7 connected in sequence. The bottom of the dichlorination dechlorination tower 2 is connected to a hydrochloric acid heater 8, and the top of the dichlorination dechlorination tower 2 is connected to a first hydrochloric acid cooler 9, which is connected to a finished hydrochloric acid tank 10. The HCl washing tower 3 is connected to a second hydrochloric acid cooler 11 and a liquid alkali storage tank 12, which is connected to a wastewater pool 13.

[0014] Furthermore, in another embodiment, the second hydrochloric acid cooler 11 is connected to the dichlorination dechlorination tower 2 via the first reflux pipe 14.

[0015] Furthermore, in another embodiment, the liquid alkali storage tank 12 is connected to the HCl washing tower 3 via a second reflux pipe 15.

[0016] Furthermore, in another embodiment, the water ring vacuum unit 5, the waste liquid storage tank 6, and the liquid alkali storage tank 12 are all connected to the exhaust gas outer pipe 16.

[0017] The working principle of one embodiment of this utility model is as follows: A 30% concentrated hydrochloric acid solution containing dichloromethane from raw material hydrochloric acid tank 1 enters dichloromethane dechlorination tower 2. The bottom of dichloromethane dechlorination tower 2 is connected to a hydrochloric acid heater 8, which heats the hydrochloric acid with hot water, causing the hydrogen chloride in the hydrochloric acid to react with dichloromethane to form a gas. At the same time, a small amount of nitrogen gas is directly added for stripping, which promotes the separation of dichloromethane from the hydrochloric acid out of the tower.

[0018] The dichloromethane gas exiting from the top of dichloromethane dechlorination tower 2 carries a large amount of hydrogen chloride gas, which enters HCl scrubbing tower 3. In HCl scrubbing tower 3, the hydrogen chloride gas carried in the dichloromethane gas is washed with pure water, and the heat of dissolution of hydrogen chloride is removed from the tower by the second hydrochloric acid cooler 11. The washed dichloromethane tail gas then passes through an alkaline scrubbing section, where the liquid alkali used comes from the liquid alkali storage tank 12. The acidic gases in the tail gas are completely removed through alkaline scrubbing.

[0019] The hydrochloric acid used to remove dichloromethane in the bottom of the dichloromethane dechlorination tower 2 is cooled by cold water in the first hydrochloric acid cooler 9 and then transported to the finished hydrochloric acid tank 10. The alkaline wastewater generated in the alkaline washing section of the HCl washing tower 3 is returned to the liquid alkali storage tank 12 via the second reflux pipe 15 for recycling until the salt content of the circulating liquid reaches the process parameters, after which it is transported to the section wastewater pool 13.

[0020] The entire stripping and absorption system is carried out under vacuum conditions, with negative pressure regulation via the tail gas buffer tank 4 and the water ring vacuum unit 5 to ensure two-phase separation. The stripped tail gas containing a small amount of dichloromethane goes to the tail gas outer pipe 16, while the condensed wastewater containing dichloromethane is transported to the raw alkali washing water storage tank 7.

[0021] Based on the description and drawings of this utility model, those skilled in the art can easily manufacture or use the vacuum stripping separation device for sulfonated by-product hydrochloric acid of this utility model, and can produce the positive effects described in this utility model.

[0022] Unless otherwise specified, in this utility model, terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe orientation or positional relationships in this utility model are for illustrative purposes only and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the accompanying drawings and according to the specific circumstances.

[0023] Unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A vacuum stripping and separation device for hydrochloric acid, a byproduct of sulfonation, characterized in that: The system includes a raw material hydrochloric acid tank (1), a dichloride dechlorination tower (2), an HCl washing tower (3), a tail gas buffer tank (4), a water ring vacuum unit (5), a waste liquid storage tank (6), and a raw alkali washing water storage tank (7) connected in sequence. The bottom of the dichloride dechlorination tower (2) is connected to a hydrochloric acid heater (8), and the top of the dichloride dechlorination tower (2) is connected to a first hydrochloric acid cooler (9), which is connected to the finished product hydrochloric acid tank (10). The HCl washing tower (3) is connected to a second hydrochloric acid cooler (11) and a liquid alkali storage tank (12), which is connected to the section wastewater pool (13).

2. The vacuum stripping and separation device for sulfonation by-product hydrochloric acid according to claim 1, characterized in that: The second hydrochloric acid cooler (11) is connected to the dichlorination dechlorination tower (2) via the first reflux pipe (14).

3. The vacuum stripping and separation device for sulfonation by-product hydrochloric acid according to claim 1, characterized in that: The liquid alkali storage tank (12) is connected to the HCl washing tower (3) through the second reflux pipe (15).

4. The vacuum stripping and separation device for sulfonation by-product hydrochloric acid according to claim 1, characterized in that: The water ring vacuum unit (5), waste liquid storage tank (6) and liquid alkali storage tank (12) are all connected to the tail gas outer pipe (16).

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