Process for treating industrial waste water from production of furfural

A technology for industrial wastewater and treatment methods, which is applied in the directions of water/sewage multi-stage treatment, heating water/sewage treatment, adsorption water/sewage treatment, etc. It can solve the problems of large investment, high operating cost, instability, etc., and achieve operating costs Low, reduced extraction volume, small footprint effect

Inactive Publication Date: 2005-08-17
CHANGCHUN JIACHEN ENVIRONMENT PROTECTING EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a treatment method for furfural production industrial wastewater to solve the proble

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1

[0020] Include the following steps:

[0021] 1. Neutralization of waste water: The waste water at the bottom of the tower produced in furfural production passes through a fluidized bed made of limestone, and the contact time is 1 hour, so that the waste water is neutralized to a pH value of 7;

[0022] 2. Concentration of raffinate: After neutralizing the waste water with a pH value of 7, it enters the double-effect evaporation system to evaporate the water in the waste water, and the raffinate is concentrated. When the solid content of the concentrated liquid is 40%, it is discharged;

[0023] 3. Adsorption filtration: move the raffinate discharged in step 2 into the reaction kettle, add 10% powdered activated carbon by weight, heat to boiling, absorb for 1 hour, centrifuge with a centrifuge at 1800 rpm, and filter;

[0024] 4. Dry the filtrate: dry the filtered liquid in step 3 to separate out white calcium acetate.

Example Embodiment

[0025] Example 2

[0026] Include the following steps:

[0027] 1. Neutralization of waste water: The tower bottom waste water generated in furfural production passes through a fluidized bed made of limestone, and the contact time is 1.2 hours, so that the waste water is neutralized to a pH value of 7.5;

[0028] 2. Concentration of raffinate: After neutralizing the waste water with a pH value of 7.5, it enters the double-effect evaporation system to evaporate the water in the waste water, and the raffinate is concentrated. When the solid content of the concentrated liquid is 40%, it is discharged; the furfural production The aldehyde gas generated at 130°C to 150°C is passed into the double-effect evaporation system as a heat source.

[0029] 3. Adsorption filtration: move the raffinate discharged in step 2 into the reactor, add 12% powdered activated carbon by weight, heat to boiling, absorb for 1 hour, centrifuge with a centrifuge at 1860 rpm, and filter;

[0030] 4. Dry ...

Example Embodiment

[0031] Example 3

[0032] In step 2: the water vapor evaporated by the double-effect evaporation system is heat-exchanged through the heat exchanger, and the cooling water is heated to 65°C-75°C as supplementary water for the boiler.

[0033] All the other steps are the same as in Example 1.

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PUM

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Abstract

The process of treating industrial waste water from furfural production includes the following steps: 1) neutralizing tower bottom waste water to pH 7-8 via making it flow through one fluidized bed of limestone; 2) concentrating residual liquid through evaporating water inside one double-effect evaporation system; 3) adsorbing the residual liquid heated to boil with powdered active carbon inside one reactor and eccentrically filtering; and 4) stoving filtrate. The said treating process is completed with the production of furfural. The present invention utilizes waste water as useful resource.

Description

[0001] Technical field [0002] The invention belongs to a treatment method of industrial wastewater, in particular to a treatment method of furfural production industrial wastewater. Background technique [0003] Furfural is an important organic chemical solvent and production raw material, which can be used in the production of synthetic fibers, synthetic rubber, plastics, casting resins, medicines, pesticides, dyes, spices, etc. Furfural, also known as furfuraldehyde, has the molecular formula C 5 h 4 o 2 , the molecular weight is 96.08. Melting point -37.6°C, boiling point 161.8°C. Pure furfural is a colorless transparent liquid with a bitter kernel smell, and it will turn dark brown in contact with air or acid. [0004] The production of furfural by deep processing of corn cobs began in the 1930s and was introduced in my country in the 1950s. The overall development began in the late and mid-1980s. At present, the demand for furfural and its downstream products is in...

Claims

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Application Information

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IPC IPC(8): C02F1/04C02F1/28C02F1/66C02F9/04
Inventor 于广军朱果逸张书义寇艳秋
Owner CHANGCHUN JIACHEN ENVIRONMENT PROTECTING EQUIP
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