Method for automatically controlling material flow in process for preparing monopotassium phosphate by extraction method
A technology of potassium dihydrogen phosphate and extraction method, which is applied in the direction of flow control, flow control using electric devices, non-electric variable control, etc. It can solve the problems of product index fluctuation, individual control, and dosage mismatch, etc., to improve production efficiency, Improve the level of control, improve the effect of dosage linkage and matching
Pending Publication Date: 2021-08-06
云南云天化红磷化工有限公司
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[0009] The purpose of the present invention is to provide a method for automatic control of material flow in the process of preparing potassium dihydrogen phosphate by extraction method, so as to solve the problems that in the existing process, the flow of each material is individually controlled, resulting in mismatching dosage and fluctuating product indicators
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[0029] figure 2 The automatic control process of the amount of potassium chloride solution is shown. First, it is clear that the main control flow is the amount of phosphoric acid added to the dissolving tank, and the secondary control flow is the flow of potassium chloride solution in the desalting washing tank, realizing the desalting washing tank. The flow rate of the potassium chloride solution and the amount of phosphoric acid added to the dissolving tank maintain a certain flow rate ratio for automatic control. The calculation formula is: the amount of potassium chloride solution added (m 3 / h)=[add phosphoric acid flow rate in dissolving tank (m 3 / h)×specific gravity of phosphoric acid×P in phosphoric acid 2 o 5 Concentration (%)] ÷ [ratio Ⅰ × specific gravity of potassium chloride solution × Cl in potassium chloride solution -1 concentration(%)].
[0030] In order to realize the above automatic control scheme, two independent PID single-loop control modules are ...
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The invention discloses a method for automatically controlling material flow in a process for preparing monopotassium phosphate by an extraction method, and relates to the technical field of monopotassium phosphate production processes. A ratio control system is adopted to control the automatic control of the potassium chloride addition amount, the automatic control of the extraction agent addition amount, the automatic control of the salt washing liquid circulation amount, the automatic control of the strip liquor circulation amount and the automatic control of the water washing liquid circulation amount. Through a ratio control system, the flow of each material in the working procedures of solution preparation, extraction, salt washing, reverse extraction and water washing is accurately and automatically controlled according to a calculation formula, so that a plurality of process control variables are systematically and accurately controlled, the linkage and matching of the use amount of an extracting agent and each material are greatly improved, the accurate dynamic flow ratio relationship is realized, the control level is greatly improved, process control parameters are stabilized, the production efficiency is improved, fluctuation of process indexes is effectively controlled, and the quality of finished product materials is improved.
Description
technical field [0001] The invention relates to the technical field of potassium dihydrogen phosphate production technology, in particular to a method for automatic control of material flow in the process of preparing potassium dihydrogen phosphate by an extraction method. Background technique [0002] Extraction method prepares the process flow of potassium dihydrogen phosphate as figure 1 As shown, the organic solvent M is used to carry out extraction and separation to produce potassium dihydrogen phosphate. Specifically, phosphoric acid and potassium chloride are added to water to prepare a certain proportion of dissolving liquid in the dissolving tank. The dissolving liquid and organic solvent M is extracted in the extraction tank. After extraction, phase separation is carried out to obtain potassium dihydrogen phosphate solution and extracted organic phase solution (M HCl). The potassium dihydrogen phosphate solution is evaporated and concentrated, then crystallized and...
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Login to View More IPC IPC(8): C01B25/30G05D7/06
CPCC01B25/301C01B25/303G05D7/0635
Inventor 王文毓赵劲松马姜维周秀梅张恒孙贵兴董志波张士磊刘先明晏瑞和莫志强
Owner 云南云天化红磷化工有限公司