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Method for inhibiting pressure difference rise of alkaline washing tower for preparing low-carbon olefin from methanol

A carbon olefin alkali and low carbon olefin technology, which is applied in the field of methanol to low carbon olefin, can solve the problems of increased pressure difference and high pressure difference of alkali washing tower, and achieves the effect of solving more butter and good technical effect.

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

[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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preparation example Construction

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

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

[0040] According to the method of the present invention, preferably, the conditions for the second stirring include: the temperature is 10-48° C., and the time is 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 co-solvent and an antioxidant, stirring at 10-48°C for 0.2-0.5h to obtain a mixture; The mixture is sequentially mixed with a solvent, an anti-corrosion agent, an anti-polymerization agent and a surfactant, and stirred at 10-48° C. for 0.5-2.5 hours to obtain an inhibitor composition.

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

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

[0044] (Formula I)

Embodiment 1

[0046] (A) 25 parts by weight of propylene glycol and 6 parts by weight of tert-butyl-p-hydroxyanisole were mixed, stirred at 25°C for 0.4h to obtain a mixture; the mixture was mixed with 50 parts by weight of deionized water, 10 parts by weight, Mix parts by weight of triisopropanolamine, 30 parts by weight of ethanolamine, 6 parts by weight of hydrazine hydrate, and 8 parts by weight of sodium lauryl sulfate, and stir at 25°C for 2 hours to obtain an inhibitor composition, recorded as is C1, wherein the ammonia nitrogen content in the inhibitor composition C1 is 3.2 mg / L.

[0047] (B) The operating conditions of the alkali 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.

[0048] The flow rate of the product gas at the inlet of the alkali washing tower is 90t / h, and the mass concentration of oxygenated compounds in the product gas at the inlet of the alkali washing tower is 100ppm, wherein the oxy...

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Abstract

The invention relates to the field of preparation of low-carbon alkene from methanol, and discloses a method for inhibiting pressure difference rise of an alkaline washing tower for preparing low-carbon alkene from methanol. The method comprises the steps that an inhibitor composition is injected into the alkaline washing tower of a methanol-to-light olefin separation unit, the inhibitor composition contains an anti-polymerization agent, an antioxidant, a corrosion inhibitor, a surfactant, a cosolvent and a solvent, the anti-polymerization agent is an alcohol amine compound and / or a hydrazinecompound, and the antioxidant is one or more of diisopropanolamine, tert-butyl p-hydroxy anisd and N, N-di-sec-butyl p-phenylenediamine. The method can effectively inhibit the increase of the pressuredifference of the alkaline washing tower for preparing low-carbon alkene from methanol.

Description

technical field [0001] The invention relates to the field of methanol-to-low-carbon olefins, in particular to a method for suppressing the increase in pressure difference of a methanol-to-low-carbon olefins 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 the production of chemical products from unconventional petroleum resources, and has become the focus of research on the synthesis of olefins from unconventional petroleum resources. [0003] Methanol to low-carbon olefins is based on SAPO-34 molecular sieve catalyst and catalyst continuous reaction-regeneration fluidiz...

Claims

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Application Information

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Patent Type & Authority Applications(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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