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Methanol-to-olefin alkaline washing tower differential pressure stabilizer composition and method for reducing differential pressure of alkaline washing tower

A stabilizer and composition technology, applied in the direction of hydrocarbons, carbon compound catalysts, chemical instruments and methods, etc., can solve the problems of unstable inhibitory effect of butter inhibitors, reduction of polymer mass content, unsatisfactory butter dispersion effect, etc. , to achieve the effect of solving the pressure difference increase, reducing the polymer mass content, and reducing equipment corrosion

Active Publication Date: 2021-01-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a methanol-to-olefin alkali-washing method to overcome the problems of the prior art that the pressure difference of the alkali-washing tower is difficult to stabilize, the inhibitory effect of the butter inhibitor is unstable, and the dispersion effect of the produced butter is not ideal. A tower pressure difference stabilizer composition and a method for reducing the pressure difference of an alkali-washing tower, the use of the pressure difference stabilizer can reduce the pressure difference of the alkali-washing tower, and can inhibit the production of butter in the alkali-washing tower, which has a positive effect on the produced butter Good dispersing effect, reducing equipment corrosion, and can also reduce the polymer mass content in the lye, and achieved good technical results

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This example is to illustrate the pressure difference stabilizer composition and the method for stabilizing the pressure difference of the present invention.

[0033]The mass content of acetaldehyde in the inlet product gas of the alkali washing tower of the MTO alkali washing system is 100ppm. The formula is: 50 parts by weight of isopropylamine, 0.1 part by weight of sodium thiosulfate, 0.2 part by weight of fatty alcohol polyoxyethylene ether, and 10 parts by weight of deionized water. Add deionized water, isopropylamine, sodium thiosulfate and fatty alcohol polyoxyethylene ether to the stirred tank in sequence, and stir at 25°C for 2 hours to obtain a differential pressure stabilizer.

[0034] The filling amount of this differential pressure stabilizer accounts for 100ppm of total circulating lye mass content, and device operation 150h, sampling is analyzed, calculates polymer content in lye.

[0035] Results: The polymer content in the lye reached 0.49%, and the p...

Embodiment 2

[0037] This example is to illustrate the pressure difference stabilizer composition and the method for stabilizing the pressure difference of the present invention.

[0038] The mass content of acetaldehyde in the inlet product gas of the alkali washing tower of the MTO alkali washing system is 100ppm. The formula is: 10 parts by weight of isopropylamine, 10 parts by weight of diisopropylamine, 2 parts by weight of sodium thiosulfate, 8 parts by weight of fatty alcohol polyoxyethylene ether, and 70 parts by weight of deionized water. Add deionized water, isopropylamine, diisopropylamine, sodium thiosulfate and fatty alcohol polyoxyethylene ether into the stirred tank in sequence, and stir at 25°C for 2 hours to obtain a differential pressure stabilizer with a pH value of 12.

[0039] The filling amount of this differential pressure stabilizer accounts for 100ppm of total circulating lye mass content, and device operation 150h, sampling is analyzed, calculates polymer content i...

Embodiment 3

[0042] This example is to illustrate the pressure difference stabilizer composition and the method for stabilizing the pressure difference of the present invention.

[0043] The mass content of acetaldehyde in the inlet product gas of the alkali washing tower of the MTO alkali washing system is 100ppm. The formula is: 18 parts by weight of isopropylamine, 2 parts by weight of diisopropylamine, 6 parts by weight of sodium thiosulfate, 1 part by weight of fatty alcohol polyoxyethylene ether, and 73 parts by weight of deionized water. Add deionized water, isopropylamine, diisopropylamine, sodium thiosulfate and fatty alcohol polyoxyethylene ether into the stirred tank in sequence, and stir at 25°C for 2 hours to obtain a differential pressure stabilizer with a pH value of 13.5.

[0044] The filling amount of this differential pressure stabilizer accounts for the total circulating lye mass content and is 160ppm, and the device runs for 150h, and sampling is analyzed to calculate t...

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PUM

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Abstract

The invention relates to the field of petrochemical engineering, and discloses a methanol-to-olefin alkaline washing tower differential pressure stabilizer composition and method for reducing differential pressure of alkaline washing tower. The differential pressure stabilizer composition comprises an aliphatic amine compound, thiosulfate, a surfactant and a solvent, the aliphatic amine compound is selected from isopropylamine and / or diisopropylamine, and the thiosulfate is sodium thiosulfate. By adopting the differential pressure stabilizer, the differential pressure of the alkaline washing tower can be reduced, the generation amount of grease in the alkaline washing tower can be inhibited, a good dispersion effect on the generated grease is achieved, equipment corrosion is reduced, the mass content of polymers in alkali liquor can be reduced, and a good technical effect is achieved.

Description

technical field [0001] The invention relates to the field of petrochemical technology, in particular to a pressure difference stabilizer composition for an alkali-washing tower of methanol to olefins and a method for reducing the pressure difference of an alkali-washing tower. Background technique [0002] Methanol-to-Olefin (MTO for short) refers to the technology of producing methanol from natural gas or coal through synthesis gas, and then producing low-carbon olefins such as ethylene and propylene from methanol under the action of a catalyst. Its products have been proved to be fully applicable Used in the production of polyolefin and other products. MTO technology has opened up a new process route for producing chemical products from unconventional petroleum resources, and has become the research focus of olefin synthesis from unconventional petroleum resources. [0003] In the olefin recovery system of the MTO process technology, the alkali washing process is mostly u...

Claims

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Application Information

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IPC IPC(8): C07C1/20C07C11/04C07C11/06C07C7/20
CPCC07C1/20C07C7/20C07C2529/85C07C11/04C07C11/06Y02P30/40
Inventor 王洪涛齐国祯王莉郑毅骏
Owner CHINA PETROLEUM & CHEM CORP
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