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Method and special cooling device for recovering pure alkali from molten-state saponifiable waste alkali liquor

A cooling device and waste lye technology, applied in chemical instruments and methods, inorganic chemistry, alkali metal compounds, etc., can solve problems such as temperature difference bumping and splashing, waste water discharge PH value exceeding the standard, safety hazards, etc., and achieve no environmental pollution. , Simple operation, no security risks

Active Publication Date: 2013-01-02
昌德新材科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent "97108274.X" discloses a method and equipment for saponification waste lye incineration to recover soda ash. In this process, because the temperature of the molten sodium carbonate at the bottom of the furnace reaches above 1000°C, the molten sodium carbonate is directly discharged into the water Dissolving in the dissolution tank, there is a phenomenon of bumping splash and explosion due to the large temperature difference between the hot and cold medium and the uneven local heat exchange after the molten sodium carbonate is directly exposed to water and cooled, which has a great safety hazard and also causes waste water discharge The problem of excessive pH value

Method used

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  • Method and special cooling device for recovering pure alkali from molten-state saponifiable waste alkali liquor
  • Method and special cooling device for recovering pure alkali from molten-state saponifiable waste alkali liquor
  • Method and special cooling device for recovering pure alkali from molten-state saponifiable waste alkali liquor

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Embodiment 1

[0014] refer to figure 1 : the cooling device of the present embodiment is a semicircular tubular jacket welded by the lower semicircular tubular steel plate 1 and the upper semicircular tubular steel plate 2, the jacket is divided into 3 sections, the length of the first section is 1 meter, the second section The length is 4 meters, the width is 1.2 meters, the third section is 5 meters in length, 2 meters in width, and the thickness of the jacket is 0.1 meters. The inclination between the first section and the third section is 15°C. The semicircular tubular groove on the jacket forms a high-temperature molten alkali flow channel 3, and flowing cooling water 4 at 28-33°C flows through the jacket. The flow rate of flowing cooling water is 10 tons / h, and the flow rate of flowing cooling water can be measured by a water meter before being introduced.

[0015] The molten alkali in the incinerator flows to the top of the cooling device, and the temperature of the molten alkali is...

Embodiment 2

[0017] The difference from Embodiment 1 is that the cooling device is a groove-shaped jacket welded by the upper concave steel plate and the upper concave steel plate. The circulating water flow rate is 15 tons / h. The molten alkali is cooled into a solid while flowing on the inner surface of the groove on the cooling device, and the solid is manually shoveled into the conveyor belt or loading car in time, and all the molten alkali finally forms solid sodium carbonate with a temperature below 300°C, and all sent To the warehouse for air cooling.

Embodiment 3

[0019] The difference from Embodiment 2 is that the cooling device is a rectangular jacket. A baffle 5 is provided inside the jacket.

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Abstract

The invention discloses a method and a special cooling device for recovering pure alkali from molten-state saponifiable waste alkali liquor. The method includes the steps of leading high-temperature molten-state alkali to flow through a runner of the special cooling device which is inclined in forward-backward direction, cooling during the flowing process, and finally forming solid-state sodium carbonate with a temperature under 300 DEG C. The special cooling device comprises a steel jacket; and the steel jacket is formed by welding a lower layer steel plate and an upper layer steel plate, the total length of the jacket is 5-9 meters, and the forward-backward inclination is 10-30 degrees; the steel plates on the jacket form the runner of the high-temperature molten-state alkali; and the jacket is internally introduced with flowing cooling water, the flow rate of which is 10-20t / h. The invention has no potential safety hazard and no pollution to environment and is simple to operate.

Description

technical field [0001] The present invention relates to a method and device for recovering soda ash, in particular to a method for recovering soda ash from the molten waste lye formed by incineration of the saponification liquid produced in the process of preparing cyclohexanone by oxidation of cyclohexane and a special cooling system. device. Background technique [0002] A kind of saponified waste lye is produced in the production process of preparing cyclohexanone by oxidation of cyclohexane. The saponified liquid contains organic matter and sodium carbonate, etc., and its COD and pH values ​​are much higher than the national standard. Chinese patent "97108274.X" discloses a method and equipment for saponification waste lye incineration to recover soda ash. In this process, because the temperature of the molten sodium carbonate at the bottom of the furnace reaches above 1000°C, the molten sodium carbonate is directly discharged into the water Dissolving in the dissolutio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D7/00
Inventor 姜红军袁年武谢正堂邓永志冯亚军
Owner 昌德新材科技股份有限公司