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Process for recycling wastewater containing low boiling-point organism such as formaldehyde and high-concentration inorganic salt

A technology of organic matter and inorganic salt, which is applied in the field of recycling technology and can solve problems such as environmental pollution

Inactive Publication Date: 2014-01-29
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At the same time, if this type of industrial wastewater containing low-boiling point organic matter and high-concentration inorganic salts is discharged directly, it will cause great pollution to the environment

Method used

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  • Process for recycling wastewater containing low boiling-point organism such as formaldehyde and high-concentration inorganic salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The technological process of recycling waste water containing formaldehyde and other low-boiling point organic substances and high-concentration inorganic salts produced in the flavor and fragrance industry is shown in the attachment figure 1 shown. The system is mainly composed of rectification system and multi-effect evaporation system. There are metering and control instruments and pipelines between each equipment. The waste water containing 0.01% low-boiling point organic mixture (including formaldehyde, methanol, chloromethane, etc.) and 10% inorganic salts enters the neutralization tank V-1 from pipeline 1 for alkali neutralization, and the solution becomes neutral. After that, preheat three times through heat exchangers E-1, E-2 and E-3. The heat source of heat exchanger A E-1 is the mixed solution in intermediate tank V-2, and the heat source of heat exchanger B E-2 is The steam at the top of the third-stage evaporator T-5, and the heat source of E-3 is the st...

Embodiment 2

[0027] The mode of operation is as in Example 1.

[0028] Wastewater containing 4.2% low-boiling organic mixtures (including formaldehyde, methanol, ethanol, chloromethane, etc.) and 23% inorganic salts produced in the pharmaceutical industry enters the neutralization storage tank V-1 through pipeline 1 for alkali neutralization And, the solution becomes neutral, and then preheated three times through heat exchangers A, B and C E-1, E-2 and E-3, and the heat source of heat exchanger A E-1 is intermediate tank V-2 The mixed solution in the heat exchanger B E-2 heat source is the steam at the top of the third pole evaporator T-5, and the heat source of heat exchanger C E-3 is the steam at the top of the atmospheric distillation column T-1. The raw material that has been preheated three times enters the atmospheric rectification tower T-1 through the pipeline 33, and the steam at the top of the atmospheric distillation tower T-1 passes through the heat exchanger C E-3 to preheat ...

Embodiment 3

[0033] The mode of operation is as in Example 1.

[0034] Wastewater containing 10% low-boiling point organic compounds (including formaldehyde, methanol, methylene chloride, etc.) and 40% inorganic salts produced in the leather industry enters the neutralization storage tank V-1 through pipeline 1 for alkali neutralization, Turn the solution into neutral, then preheat three times through heat exchangers A, B and C E-1, E-2 and E-3, the heat source of heat exchanger A E-1 is the intermediate tank V-2 For the mixed solution, the heat source of heat exchanger B E-2 is the steam at the top of the third-stage evaporator T-5, and the heat source of heat exchanger C E-3 is the steam at the top of the atmospheric distillation tower T-1. The raw material that has been preheated three times enters the atmospheric rectification tower T-1 through the pipeline 33, and the steam at the top of the atmospheric distillation tower T-1 passes through the heat exchanger C E-3 to preheat and cond...

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Abstract

The invention relates to a process for recycling wastewater containing low-boiling-point organisms such as formaldehyde and high-concentration inorganic salt. The process mainly adopts equipment such as a refining tower and a multiple-effect evaporation system, and an inorganic salt solution with high concentration and organisms such as methanol and formaldehyde in the wastewater are obtained by processing the wastewater containing low-boiling-point organisms with the concentration of 0.01-10% or higher and inorganic salts such as NaCl, Na2SO4 or NH4Cl and the like with the concentration of 1-40% or higher by using the refining tower and the multiple-effect evaporation system. In the process, preheating of raw materials and heating in the middle process are realized by utilizing waste heat of tower top steam and tower bottom material liquid in the distillation process, so as to form a thermal coupling network, and therefore the energy consumption for treating wastewater per unit mass is greatly reduced as compared with that of the conventional processes. The process has the outstanding advantages of low energy consumption, high efficiency and the like.

Description

technical field [0001] The invention relates to a recycling process of waste water containing formaldehyde and other low-boiling point organic matters and high-concentration inorganic salts. Background technique [0002] Wastewater containing formaldehyde and other low-boiling organic matter and high-concentration inorganic salts refers to the waste water containing formaldehyde, methanol, ethanol, methane, ethyl acetate, methyl acetate, etc. Organic matter lower than water, and also contain high concentration of ammonium chloride, potassium chloride, sodium chloride, ammonium sulfate, potassium sulfate, sodium sulfate and other inorganic salts, or contain high concentration of Cl - , or SO 4 = , or NO 3 - Wastewater such as inorganic acid ions. These low-boiling point organics and inorganic salts are valuable resources and are worth recycling. For example, formaldehyde, methanol and ethanol are commonly used chemical industry basic raw materials and clean liquid fuels...

Claims

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Application Information

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IPC IPC(8): C02F9/10C07C47/058C02F1/04
Inventor 周政张志炳孟为民杨高东
Owner NANJING UNIV
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