Method of processing p-benzene dicarboxylic acid production wastewater

A technology of terephthalic acid and a treatment method, which is applied in the field of industrial wastewater treatment and reuse, can solve the problems of inability to recover organic matter in wastewater, reuse of effluent, etc., and achieves a wide application range of water quality, simple process flow, and improved use efficiency. Effect

Active Publication Date: 2008-04-02
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] The purpose of the present invention is to overcome the deficiency that the existing waste water treatment technology produced by PTA cannot reuse the treated effluent as desalted water required by the process, and cannot recover the organic matter in the waste water, and proposes a method that can not only make most of the PTA produced After the wastewater is treated, it can be reused as desalted water in the process for production, and most of the organic matter in the wastewater can be recovered, so as to realize the resource utilization of PTA wastewater and organic matter in the wastewater

Method used

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  • Method of processing p-benzene dicarboxylic acid production wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. The raw material wastewater is taken from the continuous wastewater of the refining process of the PTA production unit, and its main composition is as follows:

[0037] Terephthalic acid 0.25%

[0038] p-Toluic acid 0.079%

[0039] Benzoic acid 0.007%

[0040] Acetic acid 0.1%~0.2%

[0041] pH ~2.5

[0042] COD ~2800mg / L

[0043] Raw waste water is firstly filtered through a rotary vacuum filter, and the vacuum degree is selected as (0.4~0.8)×10 5 Pa, filtration rate is 1.5m 3 / min. Obtain solid (2) and filtrate (1)

[0044] 2. The filtrate (1) is directly sent to the 5-effect evaporation system, and the condensed water obtained after the multi-effect evaporation has the following composition, which can be used as process water and reused in the refining process, and the recovery rate of desalinated water is 80%.

[0045] Terephthalic acid ~0

[0046] Conductivity ≤1.0μs / cm

[0047] Copper ≤0.2 mg / L

[0048] Iron ≤0.5 mg / L

[0049] Silicide ≤3.0 mg / L

[00...

Embodiment 2

[0060] 1. Raw waste water, taken from the continuous waste water of the refining process of the PTA production unit, is composed as follows:

[0061] Terephthalic acid 0.47%

[0062] p-Toluic acid 0.1%

[0063] Benzoic acid 0.08%

[0064] Acetic acid 0.1%~0.2%

[0065] pH ~2.8

[0066] COD ~2500mg / L

[0067] Raw waste water is filtered through a vacuum filter with a filtration rate of 1.8m 3 / min. Add sodium hydroxide for neutralization, and adjust the pH value of the wastewater to about 7.

[0068] 2. The neutralized filtrate is sent to the 2-effect evaporation system. The composition of the condensed water obtained after the multi-effect evaporation is as follows, which can be used as process water and reused in the refining process. The recovery rate of desalinated water is 50%.

[0069] Terephthalic acid ~0

[0070] Conductivity ≤1.0μs / cm

[0071] Copper ≤0.2 mg / L

[0072] Iron ≤0.5 mg / L

[0073] Silicide ≤2.0mg / L

[0074] Sulfide (as SO 4 2- Count) ≤ 5.0 mg / ...

Embodiment 3

[0084] 1. Raw waste water, taken from the continuous waste water of the refining process of the PTA production unit, is composed as follows:

[0085] Terephthalic acid 0.86%

[0086] p-Toluic acid 0.15%

[0087] Benzoic acid 0.06%

[0088] Acetic acid 0.1%~0.2%

[0089] pH ~2.8

[0090] COD ~2400mg / L

[0091] Raw wastewater is separated from solids by a pressure centrifuge.

[0092] 2. The filtrate is sent to the 10-effect evaporation system. The composition of the condensed water obtained after multi-effect evaporation is as follows, which can be reused as process water in the refining process, and the recovery rate of desalinated water is 90%.

[0093] Terephthalic acid ~0

[0094] Conductivity ≤1.0μs / cm

[0095] Copper ≤0.2 mg / L

[0096] Iron ≤0.5 mg / L

[0097] Silicide ≤3.0 mg / L

[0098] Sulfide (as SO 4 2- Count) ≤60.0mg / L

[0099] Total solids ≤5.0 mg / L

[0100] Total metals (cobalt, manganese, nickel, chromium, etc.), ≤1.5 mg / L

[0101] The resulting conc...

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Abstract

The present invention provides a disposal of the phthalic acid production wastewater. The steps are: a. the process wastewater output from a refining process is filtered; filtrate and a solid-form object are gained; b. the filtrate is sent to and processed in a multi-effect evaporation system; steaming condensation water and condensation water with organic compound are gained; then the steaming condensation water is recycled back to the refining process and is reused; c. a solid-liquid mixture is gained by adding acid to the condensation water and precipitating; the solid-form object and the filtrate are gained by processing a solid-liquid separation to the mixture; d. water and various organic compounds are gained by fractionating the filtrate; the water is recycled back to the refining process and is reused; the organic compounds are recycled back to a xylene oxidation process; e. various organic compounds are gained though the combination and re-crystallization of the solid-form object in the step a and the solid-form object in the step c. With the present invention, the majority of the PTA wastewater is capable of being recycled and reused in the production after being disposed; in addition, the majority of the organic compounds in wastewater are reclaimed. So the economically using of the PTA wastewater and the organic compounds in wastewater is realized.

Description

technical field [0001] The invention relates to a method for treating and reusing industrial wastewater, in particular to a method for recovering desalted water and organic materials in purified terephthalic acid (abbreviated as PTA) production wastewater. Background technique [0002] PTA is an important chemical raw material, which is widely used in the production of various synthetic resins, polyester fibers, plastic films, plasticizers and coatings. The market will become a new consumption growth point, and their raw materials all come from PTA. [0003] At present, the main production process of terephthalic acid is: [0004] 1. Oxidation process: Raw material p-xylene (PX) is catalyzed and oxidized into crude terephthalic acid (CTA) by using cobalt acetate and manganese acetate as catalysts in acetic acid medium. And p-toluic acid (P-TA) and p-carboxybenzaldehyde (4-CBA) intermediate product in CTA have a strong impact on the color and luster of esterification reacti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/04
Inventor 李本高秦冰马欣张利强
Owner CHINA PETROLEUM & CHEM CORP
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