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Preprocessing method of neopentyl glycol production wastewater

A technology for the production of wastewater and neopentyl glycol, which is applied in natural water treatment, water/sewage treatment, water/sludge/sewage treatment, etc., and can solve problems such as no economical and effective treatment methods

Inactive Publication Date: 2010-01-06
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the inhibitory effect of formaldehyde on microorganisms, neopentyl glycol production wastewater containing a high concentration of formaldehyde is not suitable for direct biological treatment, and there is currently no economical and effective treatment method

Method used

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  • Preprocessing method of neopentyl glycol production wastewater
  • Preprocessing method of neopentyl glycol production wastewater
  • Preprocessing method of neopentyl glycol production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take 100mL of 300mg / L simulated formaldehyde waste water in an Erlenmeyer flask, add 0.28g of calcium oxide according to the calcium oxide / formaldehyde molar ratio of 5:1, and control the reaction temperature to 70°C under the vibration condition of 150r / min. Changes in formaldehyde concentration.

[0041] The current treatment effect is: under the condition of 70°C, when the reaction time is 60 minutes, the formaldehyde removal rate is 99.8%, and the formaldehyde concentration after treatment is 0.65mg / L, which is lower than the maximum allowable formaldehyde emission stipulated in the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" concentration limit.

Embodiment 2

[0043] Take 100mL of 500mg / L simulated formaldehyde waste water in a conical flask, add 0.187g of calcium oxide according to the calcium oxide / formaldehyde molar ratio of 2:1, and control the reaction temperature at 70°C under the vibration condition of a rotating speed of 150r / min. The concentration of formaldehyde varies with time.

[0044] The current treatment effect is: under the condition of 70°C, the removal rate of formaldehyde rises rapidly to nearly 90% in the vicinity of 40 minutes. When the reaction time is 50 minutes, the formaldehyde concentration is 0.73mg / L, and the pretreatment effect can be achieved in a short period of time.

Embodiment 3

[0046] Take 100mL of representative neopentyl glycol production wastewater (formaldehyde concentration is about 310mg / L) in an Erlenmeyer flask, under the vibration condition of 150r / min, control the reaction temperature at 70°C, according to the calcium oxide / formaldehyde molar ratio Add 0.158g of calcium oxide at a ratio of 5:1, measure formaldehyde concentration, CODcr and SS after a reaction time of 60min.

[0047] The current treatment effect is: at a reaction temperature of 70°C, when the molar ratio of calcium oxide / formaldehyde is 5:1, the removal rate of formaldehyde within 60 minutes is close to 99.9%, and the concentration of formaldehyde after pretreatment is 0.37mg / L; There is no obvious change in the process. The pretreatment of neopentyl glycol by calcium oxide alkaline catalyzed polymerization only changes the form of formaldehyde and does not completely remove it. However, after pretreatment, neopentyl glycol production wastewater can relieve the toxicity inhib...

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Abstract

A preprocessing method of neopentyl glycol production wastewater belongs to the technical field of environment governance wastewater processing. In the processing method, preprocessing is carried out on the neopentyl glycol production wastewater by utilizing calcium oxide alkaline catalysis polymerization method, so that the inhibiting effect of formaldehyde on the microorganism can be effectively removed, meanwhile, the effect of flocculating setting is given play to, biodegradability of the neopentyl glycol production wastewater can be effectively improved. The preprocessing method can be applicable to disproporation for synthesizing the wastewater generated in the production of neopentyl glycol, and can remove methanal in the wastewater on the condition that lower temperature is 40 DEG C or 50 DEG C and molar ratio of calcium oxide to methanal is 1:1, and can exert flocculating setting effect at the same time, the removal rate of methanal can reach more than 95%, the removal rate of suspended particles can reach more than 90%; the reaction time is shorter, the process effect can be reached after reacting for 60 minutes; the neopentyl glycol production wastewater after being preprocessed can be thoroughly governed by common biological method.

Description

technical field [0001] The invention belongs to the technical field of environmental treatment sewage treatment, and relates to a pretreatment method for neopentyl glycol production wastewater, in particular to a method for pretreating neopentyl glycol production wastewater synthesized by a disproportionation process by a calcium oxide alkaline catalytic polymerization method. Background technique [0002] Neopentyl glycol (Neopentyl glycol, NPG) is a white crystal, mainly used in the production of saturated polyester resins, unsaturated polyester resins, polyester polyols and esters used in synthetic lubricants (Neol brand of BASF) Neopentyl glycol is used in the manufacture of diesters used in the production of synthetic lubricants), polymer plasticizers and alkyd resins, among others. Neopentyl glycol derivatives are widely used in the fields of automobiles, textiles, medicine, coatings, pesticides, plastics and petroleum. The United States, Japan and other countries are...

Claims

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Application Information

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IPC IPC(8): C02F1/58C02F1/52C02F103/36C02F101/34
Inventor 魏琴吴丹郑显鹏王晓东杜斌魏东姚振兴司维
Owner UNIV OF JINAN
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