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Method for controlling liquid caustic soda addition amount in ammonia distillation process based on conductivity change

A technology of conductivity and variation, applied in the field of ammonia distillation process

Pending Publication Date: 2021-07-13
JIANGSU RUIDA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for controlling the amount of liquid caustic soda added in the ammonia distillation process based on the change of electrical conductivity, which solves the problem of controlling the amount of liquid caustic soda added in the ammonia distilled process

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  • Method for controlling liquid caustic soda addition amount in ammonia distillation process based on conductivity change
  • Method for controlling liquid caustic soda addition amount in ammonia distillation process based on conductivity change
  • Method for controlling liquid caustic soda addition amount in ammonia distillation process based on conductivity change

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Embodiment 1

[0025] refer to Figure 1-4 , a method for controlling the addition of liquid caustic soda in the ammonia distillation process based on changes in electrical conductivity, comprising the following steps:

[0026] The first step: gradually add 30wt% sodium hydroxide solution dropwise to the ammonium sulfate solution with a mass of m and a concentration of 0.3896mol / L, measure and record the pH of the solution throughout the process of adding 30wt% sodium hydroxide solution Value change, the conductivity change of solution and the input amount of 30wt% sodium hydroxide solution;

[0027] The second step: After the ammonium sulfate solution with a concentration of 0.3896mol / L and the sodium hydroxide solution of 30wt% are mixed to reach the reaction equivalence point, continue to add 30wt% sodium hydroxide solution to the mixed solution and continuously measure the pH of the solution value, the conductivity of the solution and the dosage of 30wt% sodium hydroxide solution;

[0...

Embodiment 2

[0036] refer to Figure 1-4 , a method for controlling the addition of liquid caustic soda in the ammonia distillation process based on changes in electrical conductivity, comprising the following steps:

[0037] The first step: gradually add 30wt% sodium hydroxide solution dropwise to the ammonium sulfate solution with a mass of m and a concentration of 0.3896mol / L, measure and record the pH of the solution throughout the process of adding 30wt% sodium hydroxide solution Value change, the conductivity change of solution and the input amount of 30wt% sodium hydroxide solution;

[0038] The second step: After the ammonium sulfate solution with a concentration of 0.3896mol / L and the sodium hydroxide solution of 30wt% are mixed to reach the reaction equivalence point, continue to add 30wt% sodium hydroxide solution to the mixed solution and continuously measure the pH of the solution value, the conductivity of the solution and the dosage of 30wt% sodium hydroxide solution;

[0...

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Abstract

The invention relates to the technical field of ammonia distillation processes, in particular to a method for controlling the liquid caustic soda addition amount in an ammonia distillation process based on conductivity change, and solves the problem of control of the liquid caustic soda addition amount in the ammonia distillation process. The method for controlling the liquid caustic soda addition amount in the ammonia distillation process based on the conductivity change comprises the following steps: 1, gradually adding liquid caustic soda into an ammonium sulfate solution in a dropwise manner, determining and recording the pH value change of the solution, the conductivity change of the solution and the liquid caustic soda input amount in the whole process of adding the liquid caustic soda; 2, after the ammonium sulfate solution and the caustic soda liquid are mixed to reach a reaction equivalent point, continuously adding the caustic soda liquid into the mixed solution, and continuously determining the pH value of the solution, the conductivity of the solution and the addition amount of the caustic soda liquid. According to the invention, two ammonium sulfate solutions with different concentrations and a sodium hydroxide solution are adopted to carry out a variable control experiment, and the method for controlling the liquid caustic soda addition amount in the ammonia distillation process based on the conductivity change is provided according to the change relationship between the solution conductivity and the liquid caustic soda addition amount in the ammonia distillation process.

Description

technical field [0001] The invention relates to the technical field of ammonia distillation process, in particular to a method for controlling the addition of liquid caustic soda in the ammonia distillation process based on the change of electrical conductivity. Background technique [0002] During the coking process of coal, a certain amount of residual ammonia water with high concentration of ammonia nitrogen, cyanide, sulfide, phenol and COD is produced, and the residual ammonia water generally needs to undergo treatment processes such as oil removal, ammonia distillation, and phenol removal. At the same time as ammonia nitrogen in the remaining ammonia water, cyanide and sulfide in the remaining ammonia water can also be removed, so that the ammonia distillation wastewater can meet the water quality requirements of biological dephenolization. Common ammonia distillation technologies include the following six types: thermal oil ammonia distillation technology , negative p...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F101/16
CPCC02F1/048C02F1/66C02F2101/16C02F2209/06C02F2209/05
Inventor 马晨皓周乔谢闯邱丽娟丁华业许晓燕蒋新娣
Owner JIANGSU RUIDA TECH CO LTD