Treatment process and treatment system for producing styrene high-concentration wastewater from methanol toluene

A high-concentration wastewater treatment technology, applied in the purification/separation of hydrocarbons, hydrocarbons, chemical instruments and methods, etc., can solve the problems of increasing the difficulty of wastewater treatment, reduce the difficulty of treatment, and realize the effect of economic benefits

Active Publication Date: 2019-04-19
YANGZHOU TIANLONG ENVIRONMENTAL PROTECTION EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the production of styrene by this process is the same as other catalytic reactions, and process water vapor containing catalyst powder, raw materials (methanol and toluene), styrene and ethylbenzene will be obtained, and the temperature is as high as 200 ° C. If it is directly lowered to a lower temperature , the process wastewater will contain higher organic matter, which increases the difficulty of wastewater treatment. The current wastewater treatment is usually a single wastewater discharge and then sent to an independent wastewater treatment system. After the treatment reaches the standard, it is discharged or discharged into the industrial park. sewage treatment system

Method used

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  • Treatment process and treatment system for producing styrene high-concentration wastewater from methanol toluene
  • Treatment process and treatment system for producing styrene high-concentration wastewater from methanol toluene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Add a certain amount of anionic polyacrylamide (molecular weight 6 million to 20 million) solution to the high-concentration styrene production wastewater from methanol toluene for flocculation and precipitation. The mass concentration of the polyacrylamide solution is 0.1wt%, and the addition ratio is 1:2000. The flocculation time is 4h, and the stirring speed is 200r / min.

[0066] The wastewater after flocculation and sedimentation is filtered through a mechanical filter with a filtration rate of 5m 3 / h, remove and collect the filter residue, the obtained filtrate enters the filter screen filter for filtration, the mesh number of the filter screen is 500 mesh, remove and collect the filter residue, and then send the obtained filtrate into a security filter with a precision of 5-20 μm for filtration and Send to the next stage, the activated sludge concentration of the obtained filtrate is 21.0mg / L.

[0067] The filtrate obtained from the security filter is separated ...

Embodiment 2

[0071] Add a certain amount of aluminum sulfate solution to styrene high-concentration wastewater produced by methanol toluene for flocculation and precipitation, the mass concentration of ferrous sulfate solution is 0.4wt%, the addition ratio is 1:5000, the flocculation time is 10h, and the stirring speed is 250r / min.

[0072] The wastewater after flocculation and sedimentation is filtered through a mechanical filter with a filtration rate of 20m 3 / h, remove and collect the filter residue, the obtained filtrate enters the filter screen filter for filtration, the mesh number of the filter screen is 200 mesh, remove and collect the filter residue, and then send the obtained filtrate into a security filter with a precision of 5-20 μm for filtration and Send to the next stage, the activated sludge concentration of the obtained filtrate is 20.2mg / L.

[0073] The filtrate obtained by the security filter is separated through a primary rectification tower. The top temperature of t...

Embodiment 3

[0077] Add a certain amount of ferric sulfate solution to carry out flocculation precipitation in methanol toluene production styrene high-concentration wastewater, the mass concentration of polyaluminum chloride solution is 0.25wt%, the addition ratio is 1:400, the flocculation time is 0.5h, and the stirring speed is 10r / min.

[0078] The wastewater after flocculation and sedimentation is filtered through a mechanical filter with a filtration rate of 1m 3 / h, remove and collect the filter residue, the obtained filtrate enters the filter screen filter for filtration, the mesh number of the filter screen is 1000 mesh, remove and collect the filter residue in the same way, and then send the obtained filtrate into a security filter with a precision of 5-20 μm for filtration and Send to the next stage, the activated sludge concentration of the obtained filtrate is 20.5mg / L.

[0079] The filtrate obtained by the security filter is separated through a primary rectification tower. T...

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Abstract

The invention discloses a treatment process and treatment system for producing styrene high-concentration wastewater from methanol toluene, wherein the treatment process comprises the following steps:adding a flocculating agent into the styrene high-concentration wastewater from the methanol toluene for flocculation, carrying out triple filtration on the obtained flocculated wastewater to obtainfiltrate and filter residue with the activated sludge concentration of 19-21mg / L; carrying out primary rectification separation on the filtrate, and respectively obtaining an ethylbenzene solution anda styrene solution at the top of the tower and the bottom of the tower; carrying out secondary rectification separation on the ethylbenzene solution, and respectively obtaining methanol-toluene mixedsolution and high-concentration ethylbenzene at the top of the tower and the bottom of the tower; carrying out styrene rectification separation on the styrene solution to obtain high-purity styrene and catalyst powder rich in tar; removing excessive moisture from the high-purity styrene to obtain a high-purity styrene product. The treatment system comprises a flocculation unit, a filtration unit,a rectification separation unit, a filter residue recovery unit and a purification unit. The treatment process and treatment system can achieve zero discharge of inorganic / organic waste and is environment friendly.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and more specifically relates to a treatment process and a treatment system for producing high-concentration styrene wastewater from methanol toluene. Background technique [0002] In the contemporary chemical industry, styrene, as an important raw material for organic synthesis, is widely used in the production of polystyrene, styrene-butadiene rubber, ion exchange resins, medicines and dyes, etc. The output of its series of chemical materials is second only to that of the world's high-yield polymers. The output ranks in the forefront of the synthetic resin production in the world. [0003] The traditional styrene production process mostly uses benzene and ethylene to produce ethylbenzene, and then catalyzes dehydrogenation to produce styrene products. This process has disadvantages such as long route, high catalyst bed temperature (600-660°C), high energy consumption and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/00C07C7/04C07C7/08C07C15/46
CPCC07C7/005C07C7/04C07C7/08C07C15/46
Inventor 谭亚南庞胜翠谢春蓉
Owner YANGZHOU TIANLONG ENVIRONMENTAL PROTECTION EQUIP
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