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Back washing method for ceramic micro-filtration membrane for low-temperature purification combined-soda process mother liquid II

A technology of ceramic microfiltration and low temperature, which is applied in the field of membrane separation technology and inorganic chemical industry. It can solve the problems of high material requirements, damage to the balance of mother liquor, and separate preparation, etc., and achieve the effect of high backwashing efficiency.

Active Publication Date: 2015-03-25
TIANJIN BOHUA YONGLI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in these studies, an acid solution with a certain pH value was often used to backwash the membrane. Although a good backwashing effect can be obtained, the backwashing solution needs to be prepared separately, and the backwashing solution flows into the system, destroying the balance of the mother liquor. In addition, Acidic backwash liquid also has relatively high requirements on the material of the pipelines and valves connecting the membrane modules

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Select the ceramic microfiltration membrane module with a pore size of 0.5 μm to filter the mother II liquid in the production process of combined alkali. When the water insoluble substances including calcium, magnesium and sediment adhere to the ceramic microfiltration membrane, the membrane flux will drop to a stable level. When the value is 50% of the value, use the heat AII whose temperature is controlled at 42°C-44°C in the production process of the combined alkali to pass between the membrane core and the membrane shell of the ceramic microfiltration membrane module to backwash the membrane. When backwashing, supplemented with The compressed air of 0.3MPa aerates the hot AI, and the aeration interval is 5s. The amount of hot AI per square meter of membrane is 600L / h, and the backwashing time is 25min.

[0014] Tested: After backwashing, the membrane flux returns to 98% of the initial value.

Embodiment 2

[0016] Choose a ceramic microfiltration membrane module with a pore size of 1 μm to filter the mother II liquor in the production process of combined alkali. When water-insoluble substances including calcium, magnesium, and sediment adhere to the ceramic microfiltration membrane, the membrane flux will drop to a stable value. When the temperature is 50% of the combined alkali production process, the temperature is controlled at 43°C-45°C in the process of backwashing the membrane through the membrane core and the membrane shell of the ceramic microfiltration membrane module. When backwashing, supplemented with 0.2 The compressed air of MPa aerates the hot AI, and the aeration interval is 7s. The amount of hot AI per square meter of film is 250L / h, and the backwashing time is 15min.

[0017] Tested: After backwashing, the membrane flux returns to 99% of the initial value.

Embodiment 3

[0019] Select the ceramic microfiltration membrane module with a pore size of 0.5 μm to filter the mother II liquid in the production process of combined alkali. When the water insoluble substances including calcium, magnesium and sediment adhere to the ceramic microfiltration membrane, the membrane flux will drop to a stable level. When the value is 50% of the value, use the heat AII whose temperature is controlled at 42°C-43°C in the production process of the combined alkali to pass between the membrane core and the membrane shell of the ceramic microfiltration membrane module to backwash the membrane. When backwashing, supplemented with The compressed air of 0.25MPa aerates the hot AI, and the aeration interval is 6s. The dosage of heat AI per square meter is 350L / h, and the backwashing time is 20min.

[0020] Tested: After backwashing, the membrane flux returns to 98.5% of the initial value.

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Abstract

The invention discloses a back washing method for a ceramic micro-filtration membrane for a low-temperature purification combined-soda process mother liquid II. The back washing method comprises the following steps: when a mother liquid II in a combined-soda process is filtered by utilizing a ceramic micro-filtration membrane assembly, water insoluble matters including calcium, magnesium and sediments are attached to the ceramic micro-filtration membrane attaches, and the membrane flux is reduced by 50% of a stable value, hot AI in the combined-soda process as a back washing liquid is charged to a membrane body between a membrane core and a membrane shell of the ceramic micro-filtration membrane assembly to perform back washing on the membrane body, and during the back washing, compressed air of 0.2-0.3MPa is discontinuously charged between the membrane core and the membrane shell to aerate the hot AI. The back washing method for the ceramic micro-filtration membrane for the low-temperature purification combined-soda process mother liquid II has the following advantages that the back washing efficiency is high, and the mother liquid balance of a combined-soda process system is not influenced; furthermore, the preparation process of the complex back washing liquid can be omitted; after the back washing, the membrane flux can recover to more than 98%.

Description

technical field [0001] The invention relates to the field of membrane separation technology and inorganic chemical industry, in particular to a membrane backwashing method for removing water-insoluble substances such as calcium, magnesium, and sand in the mother liquor of combined alkali II by using a ceramic microfiltration membrane. Background technique [0002] Compared with traditional separation methods, membrane separation has a series of advantages such as low investment, simple operation, low energy consumption, corrosion resistance, and large operating flexibility. At present, some people have successively studied the method of filtering water-insoluble substances such as calcium, magnesium, and sediment in Lianba II by using membrane separation technology, and some progress has been made. However, in these studies, an acid solution with a certain pH value was often used to backwash the membrane. Although a good backwashing effect can be obtained, the backwashing so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/02
Inventor 庞栓林谢智勇马敬环李治水张波王洪超
Owner TIANJIN BOHUA YONGLI CHEM IND
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