Dilute sulfuric acid membrane distillation and concentration device and concentration method

Abstract

The invention discloses a dilute sulfuric acid membrane distillation and concentration device. The dilute sulfuric acid membrane distillation and concentration device comprises a direct contact membrane distillation device, wherein the direct contact membrane distillation device is internally installed with a hollow fiber membrane distillation component, the hollow fiber membrane distillation component is internally installed with a hollow fiber membrane, and is characterized in that the hollow fiber membrane is a hollow hydrophobic polyvinylidene fluoride fiber membrane with a fabric lining. The invention also discloses a dilute sulfuric acid membrane distillation and concentration method by using dilute sulfuric acid membrane distillation and concentration device. By adopting the technical scheme, the dilute sulfuric acid membrane distillation and concentration device and concentration method provided by the invnetion have the advantages that: the hollow hydrophobic polyvinylidene fluoride fiber membrane with the fabric lining has the advantages of high capacity, good separation effect, no fracture and the like in the distillation process of the dilute sulfuric acid membrane; in addition, the energy can be saved, industrial waste heat, moisture heating and the like can be used for constant tempearture heating; when the operation is carried out under the normal pressure and low temperature, the loss of active ingredients is less, the concentration multiple is high, and the chemical stabilization of a thermosensitive substance is ensured.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a dilute sulfuric acid membrane distillation concentration device and a concentration method. Background technique [0002] Sulfuric acid is widely used in chemical, steel and other industries. However, in most applications, the used sulfuric acid becomes dilute sulfuric acid with impurities. If the dilute sulfuric acid is discharged into the environment without treatment, it will cause water or soil acidification, endanger the ecological environment, and waste a lot of resources. In the past, dilute sulfuric acid was often treated by producing gypsum or phosphate fertilizer, but with the development of the chemical industry and the needs of environmental protection, this treatment method can no longer meet the demand. Therefore, dilute sulfuric acid needs to be concentrated and recycled. [0003] At present, there are mainly two methods for dilute sulfuric acid con...

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Problems solved by technology

[0005] In view of the above problems, the object of the present invention is to solve the shortcomings of traditional distillation technology such as high energy consumption, based on membrane distillation technology, to provide a dilute sulfuric acid membrane distillation concentration device and concentration method with low evaporation temperature, low energy consumption, corrosion resistance and good concentration effect

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