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Method for treating polymethoxydialkyl ether production wastewater

A technology for the production of polymethoxydialkyl ethers and waste water, which is applied in natural water treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., and can solve the problems of difficult waste water treatment, high cost, waste of raw materials, etc. , to achieve the effect of reducing wastewater filtration accuracy, reducing raw material consumption, and reducing costs

Active Publication Date: 2020-11-24
SICHUAN DAXING ENERGY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the research on polymethoxydialkyl ethers mainly focuses on the synthesis. , inevitably produce a certain amount of wastewater, this type of wastewater not only contains unreacted aldehydes, alcohols and other raw materials, if not treated, it will cause waste of raw materials, but also because of the existence of aldehydes, the wastewater treatment is difficult and costly; at the same time, Due to the existence of side reactions, wastewater contains a large amount of ultrafine powder, which is suspended in wastewater and is difficult to separate by conventional methods. Therefore, the wastewater treatment of polymethoxydialkyl ethers is whether polymethoxydialkyl ethers can The key to industrialization, but there is no relevant report on the treatment of polymethoxydialkyl ether wastewater

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  • Method for treating polymethoxydialkyl ether production wastewater

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Embodiment 1

[0033] This embodiment provides a method for treating waste water from the production of polymethoxyl dialkyl ethers. body, the alcohol substance with a concentration of 25.74wt% and the aldehyde substance with a concentration of 14.75wt%; the alcohol substance is methanol; the aldehyde substance is formaldehyde.

[0034] The specific steps of wastewater treatment are as follows:

[0035] Step 1. Flocculation process: put polymethoxydialkyl ether production wastewater in a flocculation reactor, add flocculant, stir for 15 minutes and then let stand for 30 minutes. The flocculant is a mixture of polyaluminum chloride and cationic polyacrylamide, the added mass of polyaluminum chloride is 0.05‰ of the total mass of wastewater, and the mass of cationic polyacrylamide added is 0.08‰ of the total mass of wastewater.

[0036] Step 2. Standing process: standing and separating the substances after the flocculation reaction to obtain supernatant I and sludge sediment;

[0037] Step 3...

Embodiment 2

[0043] This embodiment provides a method for treating wastewater produced by polymethoxydialkyl ethers. The polymethoxydialkyl ethers are polymethoxydibutyl ethers, and the wastewater contains powders with a concentration of 95 mg / L, Alcohols with a concentration of 28.22wt% and formaldehydes with a concentration of 10.55wt.%; the alcohols are butanol; the aldehydes are formaldehyde.

[0044] The specific steps of wastewater treatment are as follows:

[0045]Step 1. Flocculation process: put polymethoxydialkyl ether production wastewater in a flocculation reactor, add a flocculant, stir for 15 minutes and then let it stand for 30 minutes to carry out a flocculation reaction. The flocculant is cationic polyaluminum chloride; the added mass of flocculant is 0.15‰ of the total mass of wastewater.

[0046] Step 2. Standing process: standing and separating the substances after the flocculation reaction to obtain supernatant and sediment;

[0047] Step 3. Filtration process: after...

Embodiment 3

[0053] This embodiment provides a method for treating waste water from the production of polymethoxydialkyl ethers. The polymethoxydialkyl ethers are polymethoxydiamyl ethers, and the waste water contains powders with a concentration of 92mg / L, Alcohols with a concentration of 30.17wt.% and formaldehydes with a concentration of 10.96wt.%; the alcohols include amyl alcohol; and the aldehydes are paraformaldehyde.

[0054] The specific steps of wastewater treatment are as follows:

[0055] Step 1. Flocculation process: put polymethoxydialkyl ether production wastewater in a flocculation reactor, add a flocculant, stir for 15 minutes and then let it stand for 30 minutes to carry out a flocculation reaction. The flocculant is polyferric sulfate; the added mass of the flocculant is 0.09‰ of the total mass of wastewater.

[0056] Step 2. Standing process: standing and separating the substances after the flocculation reaction to obtain supernatant and sediment;

[0057] Step 3. Fil...

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Abstract

The invention discloses a method for treating polymethoxydialkyl ether production wastewater. The method comprises the following steps: step 1, putting the polymethoxydialkyl ether production wastewater in a flocculation reactor, and adding a flocculant for flocculation reaction; step 2, leaving a material after the flocculation reaction to stand for separation to obtain a supernatant and a precipitate; step 3, carrying out filter-pressing treatment on the precipitate, and mixing an obtained supernatant with the supernatant obtained in the step 2 for filtration; step 4, enabling a clear liquid obtained after filtration in the step 2 to enter an alcohol distillation recovery tower for rectification separation, obtaining an alcohol product from the top of the alcohol distillation recovery tower, and obtain an aldehyde aqueous solution from the bottom of the tower; enabling the aldehyde aqueous solution to enter the aldehyde distillation recovery tower for distillation separation, and obtaining a concentrated aldehyde solution from the top of the aldehyde rectification recovery tower; and step 5, obtaining wastewater from the bottom of the aldehyde rectification recovery tower, and adding inorganic alkali for saccharification reaction treatment. The method can effectively treat suspended solids in the wastewater, recover alcohol and aldehydes, and reduce raw material consumption.

Description

technical field [0001] The invention relates to the technical field of energy and chemical industry, in particular to a method for treating wastewater produced by polymethoxy dialkyl ethers. Background technique [0002] Polymethoxydialkyl ether is a kind of oxygenated fuel with good performance, its general chemical formula is C n h 2n+1 O(CH 2 O) m CnH 2n+1 (n is an integer from 1 to 10, and m is an integer from 1 to 5), it has outstanding advantages such as high cetane number, high calorific value, low freezing point, low cold filter point, oxygen content and moderate density, and can be used with diesel oil It can be blended in any proportion and can also be used alone as diesel. Especially in the alpine region, it has the incomparable advantages of conventional diesel. Chinese patent CN107446633 discloses a polymethoxydialkyl ether type oxygenated diesel oil. The polymethoxydialkyl ether type oxygenated diesel product of this invention can significantly improve th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/74C07C45/78C07C31/04C07C31/12C07C31/125C07C31/08C07C47/04C07D323/06C02F101/34C02F103/36
CPCC02F9/00C07C29/74C07C45/78C07D323/06C02F2001/007C02F1/001C02F1/04C02F1/5236C02F1/56C02F1/5245C02F2101/34C02F2103/36C07C31/04C07C31/12C07C31/125C07C31/08C07C47/04
Inventor 龙素安张光辉卓立邓凯智李希
Owner SICHUAN DAXING ENERGY
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