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Waste water treating and resource recovering method for allomaleic acid production process

A production process and resource recovery technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of undiscovered isomerization wastewater and crystallization mother liquor wastewater treatment and resource recovery use, etc.

Inactive Publication Date: 2004-09-15
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The result of literature search shows: before the present invention is completed, do not find the report that isomerization waste water and crystallization mother liquor waste water are carried out in the production process of fumaric acid and resource recycling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: 10 mL (6.8 grams) of NDA-900 macroporous weakly basic anion exchange resin was loaded into a jacketed glass adsorption column (Φ12×160 mm). Freeze and crystallize the isomerization wastewater and crystallization mother liquor wastewater at 0°C, filter, and mix the filtrates to COD cr 52000mg / L, pass it through the resin bed at 25±5°C at a flow rate of 20mL / h, the treatment capacity is 100mL / batch, after resin treatment, the effluent is colorless and transparent, COD cr Dropped to 1812mg / L.

[0018] Use 12mL 3mol / L NaOH aqueous solution, 10mL 1mol / L NaOH aqueous solution and 30mL water sequentially at a temperature of 30±5°C to flow through the resin bed at a flow rate of 10mL / h for desorption. The desorbed high-concentration NaOH eluent (15mL) was adjusted to pH=0.4 with concentrated sulfuric acid, and after freezing (0°C), light gray solid organic matter was precipitated. The main component was fumaric acid with a purity of more than 60%. Production proces...

Embodiment 2

[0019] Example 2: 100 mL (68 grams) of NDA-900 macroporous weakly basic anion exchange resin was loaded into a jacketed glass adsorption column (Φ32×360 mm). Freeze and crystallize the isomerization wastewater and the crystallization mother liquor wastewater at 0°C, filter, and mix the filtrates of the two wastewater streams to COD cr It is 52000mg / L, at a temperature of 30±5°C, it passes through the resin bed at a flow rate of 150mL / h, and the processing capacity is 1000mL / batch. After resin treatment, the effluent is colorless and transparent, COD cr Dropped to 2106mg / L.

[0020] Sequentially use 90mL 4mol / L NaOH aqueous solution, 100mL 1mol / L NaOH aqueous solution and 300mL water at a temperature of 40±5°C to flow through the resin bed at a flow rate of 100mL / h for desorption. The desorbed high-concentration NaOH eluent (120mL) was adjusted to pH=0.8 with concentrated sulfuric acid, and after freezing (0°C), light gray solid organic matter was precipitated. The main compon...

Embodiment 3

[0021] Embodiment 3; Select three 316L stainless steel adsorption towers (Φ600 * 3500mm) with the same specification, and each tower is filled with 540 kilograms (about 800 L) of NDA-900 macroporous weakly basic complex adsorption resin. Freeze and crystallize the isomerization wastewater and crystallization mother liquor wastewater at 0°C, filter, and mix the filtrates of the two wastewaters in equal volumes to COD cr It is 51500mg / L, at room temperature (20~35℃), at 1.5m 3 The flow rate of / h is pumped into the adsorption tower, and the adsorption adopts the method of I and II towers in series and downstream adsorption, and the processing capacity of each batch is controlled at 8m 3 . After resin treatment, the effluent is colorless and transparent, COD cr Dropped to 1777mg / L.

[0022] Adsorbed over 8m 3 The No. I adsorption tower of the mixed wastewater performs desorption. First drain the residual liquid in the adsorption tower, and use 0.7m 3 4mol / L NaOH aqueous so...

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PUM

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Abstract

The invention discloses an improving and resource-recovering method of the waste water during the course of producing fumaric acid, refrigerating the waste water at -5-5deg.C, filtering to recover, and returning to producing procedure; mixing the filtrate and then passing the filtrate mixed through the absorbing tower filled with macroporous alkalescent ion exchange resin, and then making biochemical advanced treatment on the absorbed water; using dilute alkali and water as desorbing agent, to desorb the macroporous resin; adjust the pH of the high-concentration eluent desorbed by vitriol oil to 0-2, refrigerating and filtering to recover, returning to producing procedure, mixing its mother liquor with the desorbed water for biochemical treatment and low-concentration eluent is used indiscriminately in the next batch of desorbing operations. The CODcr is reduced to below 3000mg / L, and CODcr eliminating rate is greater than 94% and then can reach the effluent standard by biochemical treatment and most recourses in the waste water can be recovered.

Description

1. Technical field [0001] The invention relates to a treatment and resource recovery method of dibasic carboxylic acid-containing wastewater in the production process of chemical raw materials, in particular to a treatment and resource recovery method of wastewater in the production process of fumaric acid. 2. Background technology [0002] Fumaric acid (fumaric acid) is an important pharmaceutical and fine chemical intermediate, widely used in the synthesis of antidote sodium dimercaptosuccinate, unsaturated polyester resin and mordant, and can also be directly Used as a food additive. At present, an important production process of fumaric acid in China is to use the exhaust gas rich in maleic acid (maleic acid) discharged during the catalytic oxidation of o-xylene to produce phthalic anhydride as raw material, which is absorbed by water and catalyzed by thiourea. Isomerization, activated carbon adsorption purification, recrystallization and other steps to produce fumaric ...

Claims

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Application Information

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IPC IPC(8): C02F9/02C02F9/14
Inventor 陈金龙孙越王穆君张全兴周玮李爱民费正皓李晓弢孟凡伟韩丽
Owner NANJING UNIV
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