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Denitration method by dilute salt solution membrane process

A technology of membrane denitrification and light brine, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of high investment costs, high energy consumption and high operating costs, Reach the effect of reducing energy consumption and process cost

Inactive Publication Date: 2009-07-08
莫新来 +1
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Problems solved by technology

This process uses membrane separation and freeze crystallization to convert Na 2 SO 4 Separation without adding additional additives is in line with environmental protection requirements and is conducive to the sustainable development of enterprises. However, the investment cost of the process equipment is high. In addition to the investment in the separation membrane of the MRO process (modified reverse osmosis process), it is also necessary to purchase a large refrigeration unit. The operating temperature of the unit, freezing and crystallization operation is -5°C, and the operating energy consumption and operating cost are high

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  • Denitration method by dilute salt solution membrane process
  • Denitration method by dilute salt solution membrane process
  • Denitration method by dilute salt solution membrane process

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Embodiment Construction

[0014] Sea salt, well salt or brine are used as raw materials. After the raw materials are dissolved, they are pretreated to remove insoluble impurities and hardness ions. The pretreated salt solution (light brine) enters the electrolytic cell for electrolytic separation, and the chlorine ions in it are electrolytically separated in the form of chlorine gas. , sodium ions are separated by ion membrane in the form of sodium hydroxide, and the solution after electrolysis returns to the salt process to add raw materials to adjust to an appropriate concentration and then enters the electrolytic cell for treatment, but the SO in the solution 4 2- It cannot be decomposed and cannot be removed in pretreatment, and will accumulate in light brine.

[0015] Such as figure 1 Shown is the flowchart of the denitrification method of the light brine membrane method of the present invention. The light brine from the electrolytic cell is separated by a primary membrane to concentrate the sul...

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Abstract

The invention belongs to the field of chlor-alkali, and in particular relates to a method for denitrating light salt brine by a membrane method. The denitrating method is to use two membrane treatments to concentrate the light salt brine twice to ensure that the concentration of sulfate ions in the light salt brine approaches to saturation, and freeze and crystallize the light salt brine of which the temperature is improved to 3 to 5 DEG C from the prior 5 DEG C below zero greatly reduce energy consumption and reduce production cost. Furthermore, the method has good denitration effect.

Description

technical field [0001] The invention belongs to the chlor-alkali industry, and in particular relates to a denitrification method of light salt water membrane method. Background technique [0002] In the chlor-alkali industry, the desulfurization (denitrification) methods in light brine mainly include chemical precipitation and membrane separation. The chemical precipitation method uses metal cations such as calcium and barium and sulfate ions to produce barium sulfate or calcium sulfate precipitates, and then clarifies and separates the precipitates to remove sulfate ions. At present, there are mainly the following methods for the relatively mature precipitation method to remove sulfate ions: BaCl 2 method, CaCl 2 method, BaCO 3 method, in which BaCl 2 The effect of removing sulfate radicals is the best, BaCl 2 The reaction rate is high, but BaCl 2 It has strong toxicity and requires high storage conditions. In addition, new impurities will be introduced during the pro...

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Application Information

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IPC IPC(8): C02F9/02C02F1/44
Inventor 莫新来谭子斌
Owner 莫新来