Extracting agent for efficiently removing dihydric phenols in coal gasification wastewater and extracting method

A coal gasification wastewater and extraction agent technology, which is applied in chemical instruments and methods, extraction water/sewage treatment, water pollutants, etc., can solve the problem of low distribution coefficient of dihydric phenols, and achieve a wide range of volume ratios and operating conditions The effect of small changes and good removal effect

Active Publication Date: 2018-02-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the extraction performance of methyl isobutyl ketone to dihydric phenols is higher than that of diisopropyl ether, the distribution coefficient of dihydric phenols is still low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 50% methyl isobutyl ketone and 50% n-amyl alcohol are formulated into a composite extractant by volume ratio; the total phenol content is 3000 mg / L, wherein the unit phenol content is 1400 mg / L, and the dihydric phenol content is 1600 mg / L The temperature of coal gasification wastewater in L is controlled at 25°C, and the pH value is adjusted to 7; then, the above-mentioned composite extractant and coal gasification wastewater are subjected to two-stage countercurrent extraction in two separatory funnels at a volume ratio of 1:5, and mixed 30min, stand still for 15min to obtain the extract phase and the raffinate phase.

[0030] The content of total phenols in the raffinate phase was detected to be 99 mg / L, and the contents of unit phenols and dihydric phenols were 15 mg / L and 82 mg / L respectively.

Embodiment 2

[0032] 60% methyl isobutyl ketone and 40% n-amyl alcohol are formulated into a composite extractant by volume ratio; the total phenol content is 15000mg / L, wherein the unit phenol content is 7000mg / L, and the dihydric phenol content is 8000mg / L The temperature of coal gasification wastewater in L is controlled at 25°C, and the pH value is adjusted to 7; then, the above-mentioned composite extractant and coal gasification wastewater are subjected to three-stage countercurrent extraction in three separatory funnels at a volume ratio of 1:4, and mixed 30min, stand still for 15min to obtain the extract phase and the raffinate phase.

[0033] The content of total phenols in the raffinate phase was detected to be 48 mg / L, and the contents of unit phenols and dihydric phenols were 5 mg / L and 40 mg / L respectively.

Embodiment 3

[0035] 70% methyl isobutyl ketone and 30% n-amyl alcohol are formulated into a composite extractant by volume ratio; the total phenol content is 15000mg / L, wherein the unit phenol content is 7000mg / L, and the dihydric phenol content is 8000mg / L The temperature of coal gasification wastewater in L is controlled at 25°C, and the pH value is adjusted to 7; then, the above-mentioned composite extractant and coal gasification wastewater are subjected to three-stage countercurrent extraction in three separatory funnels at a volume ratio of 1:5, and mixed 30min, stand still for 15min to obtain the extract phase and the raffinate phase.

[0036] The content of total phenols in the raffinate phase was detected to be 59 mg / L, wherein the contents of unit phenols and dihydric phenols were 7 mg / L and 49 mg / L respectively.

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Abstract

The invention belongs to the technical field of sewage treatment, and discloses an extracting agent for efficiently removing dihydric phenols in coal gasification wastewater and an extracting method.The method comprises the following steps: preparing a composite extracting agent from 16-99% by volume of methyl isobutyl ketone used as a main extracting agent and 1-84% by volume of n-pentanol usedas a synergistic extracting agent; and performing multistage counter-current extraction on coal gasification wastewater by using the composite extracting agent to obtain an extracting phase and a raffinate phase. The composite extracting agent greatly enhances the extracting effect of the dihydric phenols; and the composite extracting agent has the advantages of wide volume ratio range of the methyl isobutyl ketone and n-pentanol and simple industrial operation, and has favorable prospects in actual industrial application.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to an extraction agent and an extraction method for efficiently removing dihydric phenols in coal gasification wastewater. Background technique [0002] Near-zero emission is a more stringent environmental protection standard proposed by the Ministry of Environmental Protection for new coal chemical industry, requiring new coal chemical industry to ensure that waste water does not discharge outside. The existing near-zero discharge process of coal gasification wastewater consists of dedusting and deoiling, phenol ammonia recovery, biochemical treatment, advanced treatment, reclaimed water reuse and evaporation and crystallization units. At present, there are many problems in the near-zero emission process, and no real near-zero emission has been achieved. One of the more serious problems is that the membrane treatment unit is seriously polluted, resulting in fr...

Claims

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Application Information

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IPC IPC(8): C02F1/26C02F9/14C02F101/34
CPCC02F1/26C02F1/40C02F3/00C02F9/00C02F2101/345C02F2301/08
Inventor 钱宇郭超谭扬通
Owner SOUTH CHINA UNIV OF TECH
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