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Solid and oil removal method and device for chilled water and washed water in MTO (methanol to olefin) process

A technology for methanol to olefins and quench water, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of incomplete catalyst recovery, paralysis of water treatment system, wear and blockage of pores and other problems, to achieve the effect of reducing the probability of forming large particles, increasing the operating cycle of the equipment, and reducing the cost of membrane replacement.

Active Publication Date: 2014-07-30
JIANGSU JIUWU HITECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above inventions all have the disadvantages of low separation precision, incomplete catalyst recovery, single function, etc.
CN101962235A discloses a method for the treatment and reuse of high-temperature wastewater of MTO process. The invention reports a small amount of high-temperature process of alkali adjustment, aeration, filtration, microfiltration or ultrafiltration membrane system, and high-temperature reverse osmosis system to treat the discharge from the bottom of the stripping tower. The method of waste water mainly removes methanol, dimethyl ether, acetic acid, propionic acid, etc. in waste water, but there is no research and report on the recovery of catalyst and oil from a large amount of quenched water and cooling water in the MTO process, and the method is complicated in process and reagents Large consumption, methanol, dimethyl ether, acetic acid, propionic acid volatilize when the temperature is high
[0004] In the MTO / MTP reaction process, in addition to the target product low-carbon olefins, there are also a large amount of by-products such as water vapor, mixed alkanes, aromatic hydrocarbons, and coke. When the catalyst and by-products coexist in the quenching tower and the water washing tower, the catalyst bridges The action forms large particles, wear and block the pores; untreated quenching water and washing water, recycling will lead to catalyst enrichment in the reactor; untreated quenching water and washing water, direct discharge leads to paralysis of the water treatment system; entering the washing tower In the process, the temperature drops after heat exchange, and oily substances are precipitated to block the pores

Method used

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  • Solid and oil removal method and device for chilled water and washed water in MTO (methanol to olefin) process
  • Solid and oil removal method and device for chilled water and washed water in MTO (methanol to olefin) process

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Effect test

Embodiment 1

[0046] Such as figure 1 In the shown device flow, methanol enters the reactor 1, and reacts under the action of a catalyst to form products and by-products. Products and by-products entrain part of the catalyst in the form of gas and enter the quenching tower 2. The quenching water from the bottom of the quenching tower 2 has a temperature of 115° C., a catalyst content of 189 mg / L, and an oil content of 510 mg / L. Driven by the first ultrafiltration membrane feed pump 4-1, it enters the first ultrafiltration membrane assembly 5-1. The ultrafiltration membrane installed inside is a titanium oxide membrane. The ultrafiltration membrane works under different pressure conditions and also Back pressure can be added to form a transmembrane pressure difference. The membrane surface flow velocity is 5m / s, the pore size is 5nm, the temperature is 87°C, and the permeation side back pressure is 0.2MPa; the recoil condition is 0.8MPa, the recoil cycle is 45min, and the recoil time is 6s. ...

Embodiment 2

[0055] Such as figure 1 In the shown device flow, methanol enters the reactor 1, and reacts under the action of a catalyst to form products and by-products. Products and by-products entrain part of the catalyst in the form of gas and enter the quenching tower 2. The quenching water from the bottom of the quenching tower 2 has a temperature of 115° C., a catalyst content of 189 mg / L, and an oil content of 510 mg / L. Driven by the first ultrafiltration membrane feed pump 4-1, it enters the first ultrafiltration membrane assembly 5-1. The ultrafiltration membrane installed inside is a titanium oxide membrane. The ultrafiltration membrane works under different pressure conditions and also The transmembrane pressure difference can be formed by adding back pressure. The transmembrane pressure difference is 0.4Mpa, the pore size is 20nm, the temperature is 87°C, and the permeation side back pressure is 0.2MPa; the recoil condition is 0.8MPa, the recoil cycle is 45min, and the recoil t...

Embodiment 3

[0064] Such as figure 1 In the shown device flow, methanol enters the reactor 1, and reacts under the action of a catalyst to form products and by-products. Products and by-products entrain part of the catalyst in the form of gas and enter the quenching tower 2. The quenching water from the bottom of the quenching tower 2 has a temperature of 115° C., a catalyst content of 189 mg / L, and an oil content of 510 mg / L. Driven by the first ultrafiltration membrane feed pump 4-1, it enters the first ultrafiltration membrane assembly 5-1. The ultrafiltration membrane installed inside is a titanium oxide membrane. The ultrafiltration membrane works under different pressure conditions and also Back pressure can be added to form a transmembrane pressure difference. The transmembrane pressure difference is 0.4Mpa, the membrane surface flow rate is 3m / s, the temperature is 87°C, and the permeation side back pressure is 0.2MPa; the recoil condition is 0.8MPa, and the recoil cycle is 45min. ...

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Abstract

The invention relates to a solid and oil removal method and device for MTO (methanol to olefin) / MTP (methanol to propylene) chilled water and washed water. The method disclosed by the invention mainly comprises the following steps of carrying out ultrafiltration membrane separation on MTO / MTP chilled water, feeding an ultrafiltration membrane concentrated solution into a three-phase cyclone-separator separation system, and recovering a catalyst and oil; cooling ultrafiltration membrane permeated liquid, and feeding the obtained liquid back to a chilled water system to cyclically reuse; carrying out ultrafiltration membrane separation on MTO / MTP washed water, feeding an ultrafiltration membrane concentrated solution into the three-phase cyclone-separator separation system, and recovering a catalyst and oil; and cooling ultrafiltration membrane permeated liquid and feeding the obtained liquid back to a washed water system to cyclically reuse. The invention also provides a solid and oil removal device for MTO / MTP chilled water and washed water.

Description

technical field [0001] The present invention relates to a method and device for removing solids and oils from quenched water and washing water in the methanol-to-olefins process. The invention relates to a method and a device for processing MTO / MTP quenching water and washing water by an integrated and coupled process of a flow separator, and achieving the purpose of water circulation inside the system, belonging to the field of process water treatment and reuse in the coal chemical process. Background technique [0002] MTO / MTP is a chemical technology that uses methanol as raw material to produce low-carbon olefins by means of a fluidized bed reaction similar to a catalytic cracking unit. The process mainly includes reaction part (reactor and regenerator), product purification part (quick cooling tower, water washing tower, alkali washing tower and drying tower) and product separation part. [0003] US6166282 discloses a MTO fluidized bed reactor, a group of cyclone separ...

Claims

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Application Information

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IPC IPC(8): C02F9/02C07C11/04C07C11/06C07C1/20
CPCY02P20/584Y02P30/20Y02P30/40
Inventor 姜海凤彭文博吴正雷项娟王肖虎张建嵩
Owner JIANGSU JIUWU HITECH
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