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Method for inhibiting the rise of pressure difference in alkali washing tower of methanol to low-carbon olefins

A technology of carbon olefin base and low-carbon olefins, which is applied in the field of methanol to low-carbon olefins, can solve the problems of high pressure difference and increase in pressure difference in the alkali washing tower, and achieve the effect of solving more butter and good technical effects

Active Publication Date: 2022-07-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of high pressure difference in the alkali washing tower existing in the prior art, and provide a method for suppressing the pressure difference increase of the alkali washing tower for the production of low-carbon olefins from methanol, which can effectively inhibit the production of low-carbon olefins from methanol Olefin alkali washing tower pressure difference rises

Method used

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Examples

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Effect test

preparation example Construction

[0038] According to the method of the present invention, preferably, the preparation method of the inhibitor composition includes: mixing a cosolvent and an antioxidant and first stirring to obtain a mixture; and then mixing the mixture with a solvent, an anticorrosion agent, and an antipolymerization agent in sequence. Mix with surfactant and stir a second time.

[0039] According to the method of the present invention, preferably, the conditions for the first stirring include: a temperature of 10-48° C. and a time of 0.2-0.5 h.

[0040] According to the method of the present invention, preferably, the conditions for the second stirring include: a temperature of 10-48° C. and a time of 0.5-2.5 h.

specific Embodiment approach

[0041] According to a specific embodiment of the present invention, a method for preparing an inhibitor composition includes: mixing a cosolvent and an antioxidant, and stirring at 10-48° C. for 0.2-0.5 h to obtain a mixture; and then mixing the The mixture is sequentially mixed with a solvent, an anti-corrosion agent, an anti-polymerization agent and a surfactant, and the inhibitor composition is obtained after stirring at 10-48° C. for 0.5-2.5 h.

[0042] The present invention will be described in detail below by means of examples.

[0043] % of polymer content in lye = weight of dry material (M 1 ) / weight of the sample (M 0 )×100% (Formula I)

Embodiment 1

[0045] (A) Mix 25 parts by weight of propylene glycol and 6 parts by weight of tert-butyl-p-hydroxyanisole, and stir at 25° C. for 0.4 h to obtain a mixture; mix the mixture with 50 parts by weight of deionized water, 10 Triisopropanolamine in parts by weight, ethanolamine in 30 parts by weight, hydrazine hydrate in 6 parts by weight, and sodium dodecyl sulfate in 8 parts by weight were mixed, and stirred at 25° C. for 2 hours to obtain an inhibitor composition, denoted as is C1, wherein the ammonia nitrogen content in the inhibitor composition C1 is 3.2 mg / L.

[0046] (B) The operating conditions of the alkaline washing tower include: the temperature at the top of the tower is 42° C., and the pressure at the top of the tower is 1.35 MPa.

[0047] The flow rate of the product gas at the inlet of the caustic washing tower is 90t / h, and the mass concentration of oxygen-containing compounds in the product gas at the inlet of the caustic washing tower is 100 ppm, wherein the oxyge...

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PUM

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Abstract

The invention relates to the field of methanol-to-low olefin production, and discloses a method for inhibiting the increase of pressure difference of methanol-to-low olefin alkali washing tower. The method comprises: injecting an inhibitor composition into an alkali washing tower of a methanol-to-light olefin separation unit, wherein the inhibitor composition contains an anti-polymerization agent, an antioxidant, an anti-corrosion agent, a surfactant, a cosolvent and a solvent, wherein , the anti-polymerization agent is an alcohol amine compound and / or a hydrazine compound, and the antioxidant is a mixture of diisopropanolamine, tert-butyl-p-hydroxyanisole and N,N-di-sec-butyl-p-phenylenediamine one or more of. The method can effectively suppress the increase of pressure difference in the alkali washing tower of methanol to light olefins.

Description

technical field [0001] The invention relates to the field of methanol-to-low olefin production, in particular to a method for inhibiting the increase of pressure difference of methanol-to-low olefin alkaline washing tower. Background technique [0002] Methanol-To-Olefin (MTO for short) refers to the production of methanol from natural gas or coal as raw material through synthesis gas, and then methanol generates low-carbon olefins such as ethylene and propylene under the action of a catalyst. Its products have been proved to be fully applicable. In the production of polyolefins 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] Methanol to light olefins is based on SAPO-34 molecular sieve catalyst and catalyst continuous reaction-regeneration fluidization technology, which converts...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/20C07C11/04C07C11/06
CPCC07C7/20C07C11/04C07C11/06Y02P30/40
Inventor 王洪涛齐国祯王莉李晓红
Owner CHINA PETROLEUM & CHEM CORP
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