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A kind of improved treatment process of mto alkaline washing waste lye

A treatment process and technology for waste lye, applied in water/sewage multi-stage treatment, neutralized water/sewage treatment, heating water/sewage treatment, etc. problems, to achieve the effect of low cost, ease of process operating conditions, and control of energy consumption

Active Publication Date: 2020-04-07
SINOPEC ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biological treatment process inevitably has the disadvantages of long process, large floor area, low treatment efficiency, high operating costs (requires regular supplementation of bacteria), etc., which limits the application of biological methods to a certain extent
At the same time, the use of biological methods will produce a certain amount of sludge, and the treatment of sludge is becoming more and more restricted.
[0009] In summary, for MTO waste lye, the current various treatment methods have many problems such as inapplicability, large investment, high operating cost, and low efficiency.

Method used

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  • A kind of improved treatment process of mto alkaline washing waste lye

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Experimental program
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Effect test

Embodiment 1

[0033] A stream of waste lye discharged from the bottom of the MTO alkali washing tower, wherein: COD is 8000mg / l, Na 2 CO 3 The concentration is 7.6 wt%, the NaOH concentration is 1.6 wt%, the free oil is 250 mg / l, the methanol concentration is 0.03 mol%, and the dimethyl ether concentration is 0.01 mol%.

[0034] use figure 1 The processing flow chart shown, the processing steps are as follows:

[0035] (1) Oil washing and degassing: Utilizing the difference in solubility, washing oil is used to wash MTO waste lye, and by standing and stratifying, the washing oil and waste lye are separated, and the oil entrained in waste lye is initially removed Carry out decompression treatment to the waste lye after oil washing to reduce its pressure from 1.4MPaG to 0.05MPaG; through oil washing and degassing, the oil content and dissolved organic matter content in the waste lye are reduced to about 4000mg / l;

[0036] (2) The storage tank is left standing: the spent lye after prelimina...

Embodiment 2

[0040] A stream of waste lye discharged from the bottom of the MTO alkali washing tower, wherein: COD is 15000mg / l, Na 2 CO 3 The concentration is 6.7wt%, the NaOH concentration is 1.5wt%, the free oil is 1000mg / l, the methanol concentration is 0.04mol%, and the dimethyl ether concentration is 0.02mol%.

[0041] use figure 1 The processing flow chart shown, the processing steps are as follows:

[0042] (1) Oil washing and degassing: Utilizing the difference in solubility, washing oil is used to wash MTO waste lye, and by standing and stratifying, the washing oil and waste lye are separated, and the oil entrained in waste lye is initially removed Carry out decompression treatment to the waste lye after oil washing to reduce its pressure from 1.3MPaG to 0.05MPaG; through oil washing and degassing, the oil content and dissolved organic matter content in the waste lye are reduced to about 4000mg / l;

[0043] (2) the storage tank is left standing: the spent lye after preliminary ...

Embodiment 3

[0047] A stream of waste lye discharged from the bottom of the MTO alkali washing tower, wherein: COD is 8000mg / l, Na 2 CO 3 The concentration is 7.6 wt%, the NaOH concentration is 1.6 wt%, the free oil is 250 mg / l, the methanol concentration is 0.03 mol%, and the dimethyl ether concentration is 0.01 mol%.

[0048] use figure 1 The processing flow chart shown, the processing steps are as follows:

[0049] (1) Oil washing and degassing: Utilizing the difference in solubility, washing oil is used to wash MTO waste lye, and by standing and stratifying, the washing oil and waste lye are separated, and the oil entrained in waste lye is initially removed Carry out decompression treatment to the waste lye after oil washing to reduce its pressure from 1.4MPaG to 0.15MPaG; through oil washing and degassing, the oil content and dissolved organic matter content in the waste lye are reduced to about 6100mg / l;

[0050] (2) The storage tank is left standing: the spent lye after prelimina...

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Abstract

The invention provides an improved treatment technology of MTO alkali washing waste lye. The improved treatment technology comprises the following steps: (1) performing oil washing and degassing: washing the MTO waste lye by using washing oil so as to primarily remove oils entrained in the waste lye, and then lowering the pressure to 0.15 MPaG-flare pressure; (2) allowing standing still in a storage tank: allowing the waste lye obtained after primary oil removal and pressure reduction to stay and stand still in the storage tank, and further removing floating oil after layering of oil and water; (3) neutralizing: adding inorganic acid into the waste lye obtained after standing, and controlling the PH value to be 7-9; (4) performing gas stripping on organic matters: performing gas stripping on the waste lye obtained after neutralization in a gas stripping tower system so as to remove the organic matters dissolved in the waste lye. After application of the treatment technology, the COD removal rate can reach 92% or above; organic oxides difficultly degraded in a sewage plant can be removed till the content is 20 mg / l or below, so that requirements of the conventional sewage treatment can be met.

Description

technical field [0001] The invention relates to the field of petrochemical wastewater treatment, and more specifically, relates to an improved treatment process for MTO alkaline washing waste lye. Background technique [0002] MTO plant product gas contains CO 2 and other acid gases, the process requires the CO in the product gas 2 Remove to 10 -6 (VOL) or less. At present, it is widely used to set up an alkali washing tower to remove CO by washing the product gas with NaOH solution. 2 . During the scrubbing process, the acid gas reacts with NaOH to remove it, and waste lye is generated at the same time. [0003] Unlike the waste lye produced by ethylene plants, MTO waste lye does not contain sulfur, but contains organic oxides such as dimethyl ether and methanol. The existence of organic matter will lead to high COD of spent caustic soda, and in the subsequent treatment process, it is difficult to degrade such organic oxides by traditional biochemical sewage treatment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10
CPCC02F1/02C02F1/40C02F1/66C02F9/00
Inventor 段波赵百仁王振维雷正香陈海潘珂
Owner SINOPEC ENG