A kind of production system and production process for continuously producing sodium sulfate in acid bath

Abstract

The invention discloses a production system and production process for continuously producing sodium sulfate in an acid bath. The production system includes a multi-stage flash device, an evaporator, and a rotary airflow dryer; the multi-stage flash device passes through a preheater A and an evaporation The evaporator is connected with the aging tank, the curing tank is connected with the primary thickener; the primary thickener is connected with the primary centrifuge, and the primary centrifuge is connected with the neutralization tank; the neutralization tank It is connected with the secondary thickener, and the secondary thickener is connected with the rotary airflow dryer; the production method of the production system completes the production of Yuanming powder through multiple steps. The production system of the present invention adopts multi-stage flash evaporation device, evaporator to cooperate rotary airflow drier to produce Yuanming powder, has shortened technological process route, and has reduced energy consumption, and the sodium sulfate crystal particle size that produces simultaneously is bigger, and crystal particle Uniform and plump, the apparent quality of Yuanmingfen is high.

Description

technical field [0001] The invention relates to a production system and a production process, in particular to a production system and a production process for continuously producing sodium sulfate in an acid bath. Background technique [0002] The raw material of viscose fiber is cellulose fiber, which generally comes from wood pulp or cotton pulp; cellulose reacts with sulfuric acid in the spinning bath, so that it can be regenerated and restored to a fiber state; since the spinning bath uses sulfuric acid as the main medium, the industry It is generally called "acid bath" in China. [0003] When the fiber reacts with the acid bath, the sulfuric acid reacts with the sodium hydroxide to give water and sodium sulfate. To maintain a constant acid bath composition, it is necessary to remove water and remove sodium sulfate, the whole process is called acid bath regeneration. Sodium sulfate is also called sodium sulfate, and recovery of sodium sulfate from the acid bath can no...

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Problems solved by technology

[0005] The advantage of the above-mentioned first process route is that the obtained sodium sulfate particles are uniform, the process is mature, the degree of automation is high, and the process operation and process control are convenient; Sodium sulfate with 1 crystal water molecule, Glauber's salt is easy to deliquescence and inconvenient to store, and there are few fields of direct application. Generally, it needs to continue to process to remove the crystal water in Glauber's salt molecule to obtain Yuanming powder. This process requires a large number of equipment configurations. , large investment in equipment

[0006] The advantage of the above-mentioned second process route is that the process flow is short, and the disadvantage is that the process is unstable. The step-by-step cooling curve of multi-stage flash evaporation is just opposite to the solubility curve of sodium sulfate, resulting in uneven sodium sulfate particles and most of the crystals The size is small, the process can only run intermittently, the degree of automation is low, the labor intensity of the operators is high, the fine crystals are not easy to achieve solid-liquid separation, and it is easy to block the pipeline and separation equipment; the workload of operating and maintaining these equipment is large, and the The dismantling of the field resulted in severe acid leakage, poor working environment, and intermittent operation seriously affected the normal service life of dynamic and static equipment.

[0007] Both of the above two process routes are separated by centrifuge first, and then ordinary airflow dryer or fluidized bed dryer is used. Not only the process is long, the number of equipment is large, the height of the plant is high, the floor area is large, and the energy consumption is high. , the moisture content is not easy to control, resulting in frequent agglomeration or even blockage of Yuanming powder

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