Acid-absorbing crystallization device and process flow thereof

Abstract

The invention discloses an acid-absorbing crystallization device comprising a vacuum system, and an acid bath processing system. The device also comprises a sulfuric acid circulation system. The acid bath processing system comprises sequentially connected components of a pre-cooler set, a crystallization machine set, a thickening device, a centrifuge, and a residual heat condenser set. The sulfuric acid circulation system comprises circularly arranged components of a steam absorber set, a sealing tank, an acid tank, an acid pump, and a heat exchanger. The upper part of the crystallization machine set communicates with the steam absorber set. The vacuum system comprises a vacuum water jet used in vacuum pumping of the steam absorber set. Sulfuric acid solution flows in the sulfuric acid circulation system. The lower part of the thickening device is connected with the centrifuge. The residual heat condenser set is connected to the upper part of the thickening device. The upper part of the pre-cooler set is connected with the residual heat condenser set. According to the device, the crystallization process is not dependant on water temperature, the energy consumption is low, and a production capacity is high.

Description

technical field [0001] The invention relates to the technical field of deglauberin in the viscose fiber production process, in particular to an acid absorption crystallization device and a process flow thereof. Background technique [0002] In the production of viscose fiber, to remove excess sodium sulfate in the acid bath, it is necessary to lower the temperature of the acid bath, and crystallize Glauber's salt for separation and removal. [0003] In China, EBNER crystallizers or optimized devices are usually used for cooling. EBNER crystallizer process flow such as figure 2 Shown: The acid bath at about 50°C first enters the pre-cooler VK1, then passes through VK2 and VK3 in turn, and undergoes three stages of pre-cooling under vacuum to reduce the acid bath to 33°C. Continue cooling in the crystallizer K1-K4 until the temperature drops to 18°C, crystallization and precipitation of Glauber's salt. Pump P1 sends the mixed liquid (salt slurry) output from K4 to the thick...

AI Technical Summary

Problems solved by technology

[0005] 1. It depends heavily on the water temperature. When the circulating water temperature is higher than 32°C, the vacuum degree of the device will drop, and the K4 temperature will rise, making crystallization impossible

[0006] 2. The steam injectors on K2-K4 consume a lot of steam

[0008] In order to solve the problem of water temperature, some domestic enterprises use frozen brine instead of MK1 and MK2 to condense the secondary water vapor. This consumes a lot of power, and the production capacity is the same as that of the EBNER crystallizer. The temperature of crystallizer K4 is still about 18°C

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