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Device and method for separating long chain hydrocarbon in chemical wastewater from methanol to olefin

A methanol-to-olefin and chemical wastewater technology, applied in the field of chemical engineering, can solve the problems of low separation efficiency and high energy consumption, and achieve the effects of improving separation efficiency, reducing back-mixing, and simplifying wastewater treatment process

Active Publication Date: 2014-11-05
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to provide an equipment and method for separating long-chain hydrocarbons from methanol-to-olefins chemical wastewater, so as to overcome the high energy consumption and separation of long-chain hydrocarbons in the recovery of methanol-to-olefins chemical wastewater by traditional recovery and treatment methods. The problem of inefficiency

Method used

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  • Device and method for separating long chain hydrocarbon in chemical wastewater from methanol to olefin

Examples

Experimental program
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Effect test

Embodiment 1

[0049] In the solvent air flotation tower of Example 1, the gas distributor is a sand core with an average aperture of 1mm and a diameter of 6cm, which is a gas distribution plate; it includes a group of hydrophobic coalescence plate components, and the hydrophobic coalescence plate is a polyethylene coalescence The boards are installed at an inclination angle of 30°, and the distance between the boards is 10cm.

[0050] Add 20L of methanol-to-olefins chemical wastewater from the wastewater inlet of the solvent air flotation tower, wherein the concentration of long-chain hydrocarbons in the methanol-to-olefins chemical wastewater is 0.0450wt%, and the volume ratio of wastewater to organic solvent is 400:1. Add 50ml of mixed hydrocarbons (mixed hydrocarbons generated in the process of methanol to olefins) from the solvent inlet above the wastewater phase, adjust the gas flow rate to 0.01cm / s, provide gas from the air cylinder, press it into the tower through the gas distributor,...

Embodiment 2

[0052] In the solvent air flotation tower of embodiment 2, the gas distributor is a sand core with an average aperture of 5 mm and a diameter of 6 cm, which is a gas distribution plate; it includes 5 groups of hydrophobic coalescent plate assemblies, and the hydrophobic coalescent plate is polypropylene polycarbonate The board is installed at an inclination angle of 60°, and the distance between the boards is 30cm.

[0053] Add 20L of methanol-to-olefins chemical wastewater from the wastewater inlet of the solvent air flotation tower, wherein the concentration of long-chain hydrocarbons in the methanol-to-olefins chemical wastewater is 0.0750wt%, and the volume ratio of wastewater to organic solvent is 10:1. Add 2L of a mixture of n-octane and n-hexane above the wastewater phase from the solvent inlet, adjust the gas flow rate to 0.5cm / s, press the pressure from the nitrogen cylinder into the tower through the gas distributor, and start the solvent air flotation operation. The...

Embodiment 3

[0055]In the solvent air flotation tower of embodiment 3, the gas distributor is a sand core with an average aperture of 2.5 mm and a diameter of 6 cm, which is a gas distribution plate; it includes 3 groups of hydrophobic coalescence plate components, and the hydrophobic coalescence plate is polystyrene The coalescing boards are installed at an inclination angle of 45°, and the distance between the boards is 20cm.

[0056] Add 20L of methanol-to-olefins chemical wastewater from the wastewater inlet of the solvent air flotation tower, wherein the concentration of long-chain hydrocarbons in the methanol-to-olefins chemical wastewater is 0.00444wt%, and the volume ratio of wastewater to organic solvent is 100:1. And add 10ml KOH electrolyte solution to the wastewater to reduce the stability of the droplets in the water, add 400ml n-heptanol as the solvent phase from the solvent inlet above the wastewater phase, adjust the gas flow rate to 0.1cm / s, and the pressure provided by the...

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Abstract

The invention discloses a device and method for separating long chain hydrocarbons in chemical wastewater from methanol to olefins. The device includes a solvent air floatation tower and a hydrophobic coalescence board assembly; the wall of the solvent air floatation tower is provided with a wastewater inlet, a wastewater outlet, a gas inlet, a gas outlet, a solvent inlet and a solvent outlet; the position of the wastewater inlet is higher than that of the wastewater outlet; the position of the gas inlet is lower than that of the wastewater outlet; the position of the gas outlet is higher than that of the gas inlet; the solvent inlet and solvent outlet are higher than the wastewater inlet; the hydrophobic coalescence board assembly is arranged in the solvent air floatation tower, and between the wastewater inlet and the wastewater outlet. By setting the hydrophobic coalescence board assembly in the solvent air floatation tower, the increases invention coalescence opportunity of the droplets with long chain hydrocarbon organic solvent, reduces backmixing of water and solvents, improves the fluid mechanical characteristics in the solvent air floatation tower, simplifies the wastewater treatment process, reduces the energy consumption and improves the separation efficiency.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a device and a method for separating long-chain hydrocarbons from methanol-to-olefin chemical wastewater. Background technique [0002] my country has about 1.3 trillion tons of coal reserves. The primary energy structure is characterized by rich coal, poor oil, and little gas. Of the total fossil energy, 95.6% is coal, 3.2% is oil, and 1.2% is natural gas. Coal accounts for 70% of energy consumption, of which 70% of coal production is used for power generation and fuel, coking accounts for 18% to 20%, and chemical utilization accounts for only 5% to 7%. At present, my country's coal chemical industry is gradually transforming from a traditional coal chemical industry dominated by coke, calcium carbide, and coal-based fertilizers to a modern coal chemical industry dominated by petroleum substitute products. It is estimated that in the next 20 years, China's energy c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/24C07C7/00C07C9/14
Inventor 吴勇宋文杰吴月芳夏婷婷尹甜
Owner CHNA ENERGY INVESTMENT CORP LTD
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