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Closed circulation method for sodium hypochlorite waste water treatment of acetylene purification process in polyvinyl chloride (PVC) production by calcium carbide method

A technology for cleaning acetylene and sodium hypochlorite, which is applied in neutralizing water/sewage treatment, water/sewage treatment, natural water treatment, etc., can solve problems such as secondary pollution and waste of resources, improve safety, reduce acetylene loss, and The effect of low consumption

Inactive Publication Date: 2011-02-16
李永定 +2
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of secondary pollution and waste of resources caused by blowing off sub-sodium acetylene in the existing sub-sodium wastewater recycling technology, and to provide a simple treatment process, low operating cost and low energy consumption, which can meet Standard for Hyposodium Solution for Acetylene Purification, by means of which there is no loss of acetylene during its processing

Method used

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  • Closed circulation method for sodium hypochlorite waste water treatment of acetylene purification process in polyvinyl chloride (PVC) production by calcium carbide method
  • Closed circulation method for sodium hypochlorite waste water treatment of acetylene purification process in polyvinyl chloride (PVC) production by calcium carbide method

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Embodiment 1

[0017] Embodiment two, at first the sub-sodium wastewater of the original production unit is sent to the neutralization reactor 1; the sub-sodium wastewater containing acetylene is added with 10% NaOH aqueous solution in the reactor 1, and after reacting for 10 minutes, the adjusted pH value is 11. Pump the effluent to send it to the heat exchanger, and the temperature of the water after heat exchange is 35°C; the effluent enters the reactor 2, and adds 300mg / l chemical agents for sulfur removal, phosphorus removal and phosphate removal to the reactor 2, and Add acetylene stabilizer at a concentration of 20 mg / l; pump the effluent to the settling separation reactor to separate sulfide, phosphorus compounds and other suspended matter from the supernatant. The separation time is 30 minutes. After treatment, the recycled water passes through the sodium preparation tank The device is mixed with 3% fresh hyposodium to obtain the 0.1-0.08% hyposodium solution required by the cleaning...

Embodiment 2

[0018] Embodiment three, at first the sub-sodium wastewater of the original production unit is sent to the neutralization reactor 1; the sub-sodium wastewater containing acetylene is added with 1% NaOH aqueous solution in the reactor 1, and after reacting for 10 minutes, the adjusted pH value is 6. Use the pump to lift the effluent to the heat exchanger, and the temperature of the water after heat exchange is 15°C; the effluent enters the reactor 2, and adds 500mg / l chemical agents for sulfur removal, phosphorus removal and phosphate removal in the reactor 2, and Add acetylene stabilizer at a concentration of 1 mg / l; pump the effluent to the sedimentation separation reactor to separate sulfide, phosphorus compounds and other suspended matter from the supernatant. The separation time is 120 minutes. After treatment, the recycled water passes through the sodium preparation tank The device is mixed with 1% fresh hyposodium to obtain the 0.1-0.08% hyposodium solution required by th...

Embodiment 3

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Abstract

The invention discloses a closed circulation method for sodium hypochlorite waste water treatment of an acetylene purification process in polyvinyl chloride (PVC) production by a calcium carbide method, which comprises the following steps: a. feeding acetylene-containing sodium hypochlorite waste water into a reactor 1; b. adding a NaOH solution, and ensuring that the pH value of waste water at an outlet is 6-12; c. feeding the waste water subject to pH value adjustment into a heat exchanger, and reducing the temperature by 2-20 DEG C; d. feeding the waste water subject to temperature reduction into a reactor 2, and adding chemical agents; e. then feeding the waste water with the chemical agents into a settler, and separating impurities and suspended substances from the supernate to obtain a recyclable sodium hypochlorite prepared water; f. mixing the recyclable water with fresh sodium hypochlorite in a sodium hypochlorite preparation tank to obtain a required sodium hypochlorite solution; and g. feeding the prepared sodium hypochlorite solution into a purification tower, and feeding the sludge concentrated solution separated by a settler into a sludge treatment system. The invention enables the water quality to come up to the standard, greatly lowers the treatment cost and simultaneously achieves the purposes of water saving and acetylene loss reduction, thereby having favorable economic benefits and social benefits.

Description

Technical field: [0001] The invention discloses a method for closed-circuit circulation of waste water after treatment in calcium carbide process PVC production, and particularly relates to a method for recycling waste water containing acetylene, which is energy-saving and free of secondary pollution. Background technique: [0002] In recent years, the construction of calcium carbide route to produce polyvinyl chloride (PVC) projects has developed rapidly across the country. The application of new projects in new technologies has greatly improved the level of technical equipment for energy saving and comprehensive utilization of resources in the industry. Sub-sodium wastewater is not discharged in the traditional process, it is all sent to the acetylene generator, and the supernatant of calcium carbide is discharged to achieve water balance. Due to the supporting construction of calcium carbide slag cement and the new PVC plant, cement products limit the chloride content of ...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F9/04C02F103/38C02F1/58C02F1/66
Inventor 李永定闫绍才李延鼎
Owner 李永定
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