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A device for reducing the acidity and moisture of dichloromethane waste liquid

A dichloromethane and acidity technology, applied in the field of dichloromethane waste liquid recovery, to achieve the effects of reducing production costs, energy consumption, low requirements, and low corrosion

Active Publication Date: 2016-06-22
SUZHOU JIMCEL ELECTRONICS NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there is no relevant report on the problem of high acidity and moisture in the dichloromethane waste liquid

Method used

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  • A device for reducing the acidity and moisture of dichloromethane waste liquid
  • A device for reducing the acidity and moisture of dichloromethane waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of solid base loaded on mesoporous molecular sieve SBA-15: immerse 30g of mesoporous molecular sieve SBA-15 in 20mL magnesium nitrate solution with a concentration of 0.3mol / L, soak overnight at room temperature and normal pressure; evaporate to dryness in a constant temperature water bath at 95°C , placed in an oven at 120°C for 6 hours, and then baked in a muffle furnace, rising to 550°C at 10°C / min and maintaining for 3 hours. Investigate the treatment effect of different treatment temperatures on the acidity of dichloromethane waste liquid, the space velocity is controlled at 4 ~ 5h -1 , see Table 1 for details of the treatment effect.

[0029] Table 1

Embodiment 2

[0031] Preparation of solid base loaded on mesoporous molecular sieve SBA-15: immerse 20g of mesoporous molecular sieve SBA-15 in 20mL potassium hydroxide solution with a concentration of 0.1mol / L, soak overnight at room temperature and normal pressure; Dry it in an oven at 120°C for 6 hours, then bake it in a muffle furnace, raise it to 550°C at 10°C / min, and keep it for 3 hours. Investigate the treatment effects of different space velocities on the acidity of dichloromethane waste liquid. The treatment temperature is 60°C. See Table 2 for the treatment effects.

[0032] Table 2

Embodiment 3

[0034] Preparation of solid base loaded on mesoporous molecular sieve SBA-15: immerse 40g of mesoporous molecular sieve SBA-15 in 20mL sodium carbonate solution with a concentration of 0.5mol / L, soak overnight at room temperature and normal pressure; evaporate to dryness in a constant temperature water bath at 95°C , placed in an oven at 120°C for 6 hours, and then baked in a muffle furnace, rising to 550°C at 10°C / min and maintaining for 3 hours.

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Abstract

The invention relates to a device capable of reducing acidity and moisture of a dichloromethane waste liquid and belongs to the technical field of recovery of the dichloromethane waste liquid. A raw material storage tank of the device is respectively connected with a first solid alkali fixed bed, a second solid alkali fixed bed and a water absorbent fixed bed through a circulation pump by virtue of control valves; a finished product storage tank is connected with the water absorbent fixed bed by virtue of a control valve; and an on-line acidity detector is connected with the raw material storage tank. A solid alkali-loaded mesoporous molecular sieve SBA-15, which is adopted in the device, has the large specific surface area and good hydrothermal stability, can be in full contact with acidic substances in the dichloromethane waste liquid and can be regenerated, and thus the utilization efficiency of the solid alkali-loaded mesoporous molecular sieve SBA-15 is increased. By mixing nanometer calcium carbonate in the process for preparing the solid alkali-loaded mesoporous molecular sieve SBA-15, the acidity-reducing performance of the molecular sieve SBA-15 can be improved.

Description

technical field [0001] The invention relates to a device for reducing the acidity and moisture of dichloromethane waste liquid, and belongs to the technical field of dichloromethane waste liquid recovery. Background technique [0002] Dichloromethane has good dissolving power. It is a common industrial solvent with low toxicity and non-flammability. It has good dissolving power for many resins, paraffins and fats. It is a widely used industrial solvent. The pH of the dichloromethane should be neutral. If the acidity of dichloromethane is too high, it will affect the effect of dichloromethane in practical application, and it will also cause corrosion to storage and production equipment. [0003] At present, the acidic substances of industrial-grade dichloromethane are mainly removed by the sodium hydroxide method, and the acidic substances are neutralized by sodium hydroxide to reduce the acidity of dichloromethane. Industrial-grade dichloromethane removes acidic substances...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 刘鸣刘利娟孙宇亮黄成于楼云
Owner SUZHOU JIMCEL ELECTRONICS NEW MATERIAL
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