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MTO/MTP Oxygenate Stripper Bottom Liquid Dewaxing and Oil Removal Method

A compound and stripper technology, which is applied in the field of dewaxing and oil removal of MTO/MTP oxygenate stripper tank liquid, can solve problems such as blockage of heat exchangers, achieve improved heat exchange efficiency, long service life, and significant economy benefit effect

Active Publication Date: 2015-11-11
JIANGSU JIUWU HITECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems that emulsified paraffin and yellow-brown oily liquid are constantly enriched in the heat exchanger during the operation of the MTO / MTP oxygenate stripper, and even block the heat exchanger, the present invention proposes a new MTO / MTP containing Method and device for dewaxing and oil removal of oxygenate stripping tower bottom liquid

Method used

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  • MTO/MTP Oxygenate Stripper Bottom Liquid Dewaxing and Oil Removal Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The kettle liquid of the oxygenate stripping tower 1 is driven by the oxygenate stripping tower kettle liquid pump 7 and the ultrafiltration membrane feed pump 9 in turn, and enters the ultrafiltration membrane membrane module 3 with a membrane surface velocity of 5 m / s and a pore size of 200nm, temperature 65℃, recoil pressure 0.3MPa, recoil cycle 30min, recoil time 3s. The ultrafiltration membrane supernatant is returned to the oxygenate absorption tower 2 for recycling. The ultrafiltration membrane concentrate enters the two-phase cyclone separator 4, the pressure drop of the two-phase cyclone separator 4 is 0.20Mpa, and the inlet velocity is 6m / s. The water effluent from the bottom of the two-phase cyclone separator 4 returns to the inlet of the ultrafiltration membrane feed pump 9, and enters the ultrafiltration membrane system for recycling again. The output from the top of the two-phase cyclone separator 4 is a mixture of emulsified paraffin and oil; the separat...

Embodiment 2

[0048] The kettle liquid of the oxygenate stripping tower 1 is driven by the oxygenate stripping tower kettle liquid pump 7 and the ultrafiltration membrane feed pump 9 in turn, and enters the ultrafiltration membrane membrane module 3 with a transmembrane pressure difference of 0.4 MPa and a pore diameter of 200nm, temperature 65℃, recoil pressure 0.3MPa, recoil cycle 20min, recoil time 5s. The ultrafiltration membrane supernatant is returned to the oxygenate absorption tower 2 for recycling. The ultrafiltration membrane concentrate enters the two-phase cyclone separator 4, the pressure drop of the two-phase cyclone separator 4 is 0.15Mpa, and the inlet velocity is 1m / s. The water effluent from the bottom of the two-phase cyclone separator 4 returns to the inlet of the ultrafiltration membrane feed pump 9, and enters the ultrafiltration membrane system for recycling again. The output from the top of the two-phase cyclone separator 4 is a mixture of emulsified paraffin and oi...

Embodiment 3

[0054] The kettle liquid of the oxygenate stripping tower 1 enters the ultrafiltration membrane module 3 under the push of the oxygenate stripping tower kettle liquid pump 7 and the ultrafiltration membrane feed pump 9 in sequence, and the transmembrane pressure difference is 0.4 MPa, and the membrane The surface velocity is 6m / s, the temperature is 65°C, the recoil pressure is 0.3MPa, the recoil cycle is 120min, and the recoil time is 10s. The ultrafiltration membrane supernatant is returned to the oxygenate absorption tower 2 for recycling. The ultrafiltration membrane concentrate enters the two-phase cyclone separator 4, the pressure drop of the two-phase cyclone separator 4 is 0.25Mpa, and the inlet velocity is 3m / s. The water effluent from the bottom of the two-phase cyclone separator 4 returns to the inlet of the ultrafiltration membrane feed pump 9, and enters the ultrafiltration membrane system for recycling again. The output from the top of the two-phase cyclone sepa...

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Abstract

The invention relates to a method for dewaxing and deoiling MTO / MTP oxygen-containing compound stripping tower kettle liquid. The device comprises ultrafiltration membrane equipment, a two-phase cyclone separator, an oil groove and an oil skimmer. The MTO / MTP oxygen-containing compound stripping tower kettle liquid is firstly subjected to ultrafiltration membrane separation; ultrafiltration membrane permeate is returned to an oxygen-containing compound absorption tower to be recycled; ultrafiltration membrane concentrated liquid enters the two-phase cyclone separator; an oil and emulsified wax mixture separated out from the top of the two-phase cyclone separator enters the oil groove; the oil skimmer in the oil groove skims and recovers the oil at the upper layer of the mixture, so as to achieve separation and recovery of oil and wax; the concentrated liquid from which the oil and emulsified wax are removed is returned to the ultrafiltration membrane system to be recycled from the bottom of the cyclone separator. By adopting the method, the oil and emulsified wax in the oxygen-containing compound stripping tower kettle liquid can be effectively removed, and continuous and stable operation of the device is achieved; meanwhile, oil and wax in the kettle liquid are recovered, waste of resources is avoided, and pollution to the environment is also reduced.

Description

technical field [0001] The invention relates to a method for dewaxing and oil-removing the kettle liquid of an MTO / MTP oxygenate stripping tower, and belongs to the field of process water treatment and reuse in the coal chemical process. Background technique [0002] Under the situation of high oil prices in recent years, the technology of producing olefins from coal or natural gas through methanol (MTO / MTP) is at the forefront of technology development in the world, has obvious competitive potential, and has begun to enter the stage of industrial application. [0003] MTO / MTP is a chemical technology that uses methanol as raw material to produce low-carbon olefins through methanol dehydration in a fixed-bed or fluidized-bed reactor. The process mainly includes an MTO feed vaporization unit and a light hydrocarbon recovery and concentration unit. During the MTO / MTP reaction, the products are mainly low-carbon olefins, but by-products such as a large amount of water, mixed a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/02C02F1/40
Inventor 吴正雷彭文博姜海凤项娟王肖虎张建嵩
Owner JIANGSU JIUWU HITECH