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

A production system and production process technology, applied in the preparation form of alkali metal sulfite/sulfate, purification of alkali metal sulfite/sulfate, dehydration of alkali metal sulfite/sulfate, etc., can solve the problem of direct application. Problems such as few fields, low degree of automation, and uneven sodium sulfate particles

Inactive Publication Date: 2021-05-07
NANTONG SUNSHINE GRAPHITE EQUIP TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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Effect test

Embodiment 1

[0047] The multi-stage flash evaporation device used in the dilute acid bath is 20 stages of 40t / h flash evaporation, the acid bath is heated to 120°C, and the steam-water ratio reaches 0.15:1; the preheater B uses high heat transfer fiber graphite tubes, and the number of tube passes is 6 , the flow velocity in the tube reaches 1.8m / s, the heat transfer coefficient of the preheater is significantly increased, and the heat exchange area is correspondingly significantly reduced. The diameter of the preheater B is 1600mm.

Embodiment 2

[0049] The dilute acid bath is turned into a concentrated acid bath after being flashed by a multi-stage flash evaporation device. The evaporator used in the concentrated acid bath is a three-effect 3.5t / h evaporator with an evaporation capacity of 10t / h and a unit energy consumption of 1.25:1, that is, the unit Weight Yuan Mingfen consumes 1.25 units of weight steam, which is significantly lower than the current industry average of 1.8-1.9:1. The acid bath flows through the heater A through the forced circulation pump, and the flow rate reaches 2-2.5m / s. The crystals pass through the heating tube quickly without scaling on the surface of the heating tube. The solid-liquid mixture is finally discharged from the first-effect evaporation crystallizer, and the solid content reaches 40-45%.

Embodiment 3

[0051] The concentrated material (solid-liquid mixture) discharged from the secondary thickener is fed from the bottom of the rotary airflow dryer, and an agitator is provided in the dryer cylinder 13 to promote the fluidization of the wet material. The preheated fresh air (150°C) enters the dryer cylinder 13 through the gas distributor, and the hot air flows upward in a spiral shape. Under the joint action of the agitator, the wet material is dispersed into small particles and presents a fluidized state. Determine the particle size of sodium sulfate as required to be 150 μm. At this time, the residence time is controlled at 200-300 s. A classification ring 12 is provided in the dryer cylinder 13. After classification, materials with suitable particles and qualified moisture are discharged from the discharge port 14. The gas is carried to the cyclone separator 26 for gas-solid separation, and unqualified materials fall into the lower part of the dryer and continue to participat...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D5/18C01D5/16
CPCC01D5/004C01D5/16C01D5/18
Inventor 许金成殷禄华冯圣君
Owner NANTONG SUNSHINE GRAPHITE EQUIP TECH
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