A kind of processing method and processing system of mixed acid

A treatment system and mixed acid technology, applied in chemical instruments and methods, halogen/halogen acid, chlorine/hydrogen chloride, etc., can solve the problems affecting the normal production process of potassium sulfate and the production cost of potassium sulfate, so as to save construction costs and realize The effect of processing utilization and reducing production cost

Active Publication Date: 2021-12-07
青岛碱业钾肥科技有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] With the increasingly stringent environmental protection requirements, the price of hydrochloric acid, a by-product of potassium sulfate, was once at a negative value, and the price of mixed acid was as low as about -300 yuan / t, which had a great impact on the production cost of potassium sulfate
In the case of limited storage space for mixed acid, if the mixed acid produced cannot be disposed of in time, it will also affect the normal production process of potassium sulfate

Method used

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  • A kind of processing method and processing system of mixed acid
  • A kind of processing method and processing system of mixed acid
  • A kind of processing method and processing system of mixed acid

Examples

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Comparison scheme
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Embodiment 1

[0051] The present embodiment provides a kind of processing method of the mixed acid that produces when adopting Mannheim method to produce potassium sulfate, comprises:

[0052] Adopt Mannheim method to produce potassium sulfate, obtain by-product mixed acid;

[0053] Mixing the mixed acid with hydrochloric acid to obtain a mixed solution;

[0054] The limestone is used to react with the mixed solution to produce calcium chloride.

[0055] When the Mannheim method is used to produce potassium sulfate, potassium chloride and sulfuric acid react in the Mannheim furnace to generate potassium sulfate and high-temperature hydrogen chloride gas. Pass the gas containing hydrogen chloride discharged from the reaction chamber into the mixed acid washing tower to wash away the sulfate ions, and then absorb the gas discharged from the mixed acid washing tower with water to obtain hydrochloric acid with high purity. At the same time, mixed acid containing a large amount of chloride ion...

Embodiment 2

[0069] like figure 1 As shown, this embodiment provides a mixed acid treatment system, including a hydrochloric acid delivery unit, a mixed acid addition unit and a calcium chloride production unit.

[0070] Specifically, the hydrochloric acid delivery unit includes a hydrochloric acid delivery pump 1, a first delivery pipeline 11 communicating with the hydrochloric acid storage device and the inlet of the hydrochloric acid delivery pump 1, and a second delivery pipeline 12 communicating with the outlet of the hydrochloric acid delivery pump 1.

[0071] The mixed acid adding unit includes a mixed acid storage device (not shown in the figure) and a mixed acid delivery pipeline 23 . The inlet end of the mixed acid delivery pipeline 23 communicates with the mixed acid storage device, and the outlet end of the mixed acid delivery pipeline 23 communicates with the first delivery pipeline 11 .

[0072] Described calcium chloride production unit comprises the acid calcium reactor 2 ...

Embodiment 3

[0083] like figure 2 As shown, this embodiment is a further limitation of the second embodiment above, and the treatment system further includes a buffer tank 5 for storing hydrochloric acid, and the buffer tank 5 is connected with a buffer inlet pipe 51 and a buffer outlet pipe 52 . Both the buffer inlet pipe 51 and the buffer outlet pipe 52 are in communication with the third delivery pipeline 13 and the fourth delivery pipeline 14, between the inlet ends of the third delivery pipeline 13 and the fourth delivery pipeline 14 and the inlet end of the buffer inlet pipe 51 There is also a valve 53 for cutting off the solution in the pipeline.

[0084] In this embodiment, when the staff closes the valve 53 to stop the mixed solution of mixed acid and hydrochloric acid from passing into the third delivery pipeline 13 and the fourth delivery pipeline 14, because the installation position of the buffer tank 5 is higher, the corresponding buffer tank 5 The hydrochloric acid flows i...

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Abstract

The invention belongs to the technical field of chemical production, and discloses a treatment method and system for mixed acid. The treatment method comprises: producing potassium sulfate by Mannheim method to obtain mixed acid as a by-product; mixing the mixed acid with hydrochloric acid to obtain mixed acid solution; limestone is used to react with the mixed solution to produce calcium chloride. In the present invention, by mixing the by-product mixed acid produced in the production process of potassium sulfate with hydrochloric acid for the production of calcium chloride, the mixed acid produced in the production of potassium sulfate can be consumed, the processing cost of the mixed acid is saved, and the production of potassium sulfate is reduced. At the same time, the mixed acid is mixed with hydrochloric acid and then reused instead of directly mixing with limestone to produce calcium chloride, which avoids the situation that the calcium sulfate content in the obtained calcium chloride product exceeds the standard.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a treatment method and system for mixed acid. Background technique [0002] Potassium sulfate is an important basic chemical raw material. Currently, the production of potassium sulfate is mostly carried out by the Mannheim process. Potassium chloride and sulfuric acid are reacted in a Mannheim furnace to generate potassium sulfate and high-temperature hydrogen chloride gas. Since the reaction tail gas contains a large amount of hydrogen chloride gas, direct discharge will cause environmental pollution and waste of resources. It needs to enter the absorption system for water absorption, and the obtained hydrochloric acid can be used in other production processes. For example, some large chemical companies will adopt the joint production process of potassium sulfate and calcium chloride, and use the high-concentration hydrochloric acid generated in the prod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/28C01B7/03
CPCC01B7/035C01F11/28
Inventor 孙新德代善乐姜杰石信平任兴源刘建波
Owner 青岛碱业钾肥科技有限公司
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