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Method for inhibiting grease in alkaline washing towers

A technology of alkali washing tower and butter, which is applied in chemical instruments and methods, purification/separation of hydrocarbons, hydrocarbons, etc., and can solve problems such as poor inhibition effect of butter, easy blockage of alkali washing tower, inconvenient operation, etc.

Active Publication Date: 2013-01-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that in the prior art, the butter suppression effect is not good, which leads to the problem that the alkali washing tower is easy to be blocked and the operation is inconvenient, and a new method for inhibiting the butter in the alkali washing tower is provided

Method used

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  • Method for inhibiting grease in alkaline washing towers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Apply the inhibitor to the alkali washing tower of the ETO plant, wherein the molar composition of the materials entering the alkali washing tower is: ethylene 49.1%, water 50.25%, acetaldehyde 0.05%, ether 0.01%, C 3 + Hydrocarbon 0.58%, CO 2 0.01%. Alkali washing tower lye temperature is 45°C, lye (NaOH) concentration is 10%, the inhibitor N-aminopiperidine is continuously injected into the lye circulation line using a piston pump, and the injection concentration is 65ppm. After 30 days of operation of the device, no Tower blocking occurs. Adopt the testing method of GB8978-1996 to test that the COD value in the lye is 991 mg / liter, and the results are shown in Table 1.

Embodiment 2～13

[0014] According to each step of [Example 1], only the inhibitors added and their concentrations are different. The specific results are shown in Table 1.

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PUM

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Abstract

The invention relates to a method for inhibiting grease in alkaline washing towers to mainly solve problems comprising easy alkaline washing tower obstruction and inconvenient operation caused by bad grease inhibition effects in previous technologies. According to the invention, an inhibitor is injected in an online continuous manner, wherein the inhibitor comprises one or two of two compounds having structures shown in the specification; R in the structures is an alkyl group or an aromatic group containing 0-15 carbon atoms. The above technical scheme well solves the problems, and the method can be used in industrial devices the alkaline washing towers for petrochemical ethylene, ethanol-to-ethylene, methanol-to-olefin, methanol-to-propylene, vinyl acetate, dichloroethylene, epoxy propane and the like.

Description

technical field [0001] The invention relates to a method for suppressing butter in an alkali washing tower. Background technique [0002] In the industrial production process of petroleum ethylene, ethanol dehydration to ethylene (ETO), methanol to olefins (MTO), methanol to propylene (MTP), vinyl acetate, ethylene dichloride, propylene oxide, etc., in order to obtain the target product that meets the purity requirements , or the unreacted material is recycled, and the stream flowing out of the reactor needs to go through a series of purification, separation and purification processes. In these industrial production processes, it is inevitable to generate some acidic impurities such as CO 2 Wait. If these acidic substances are not removed, they will cause adverse effects in subsequent production. Therefore, it is necessary to carry out alkali washing on the reaction tail gas to remove the acidic substance CO 2 Etc., this just must use the alkali washing tower that is med...

Claims

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Application Information

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IPC IPC(8): C07C11/04C07C7/20
Inventor 李亚男李玉宁金照生徐菁
Owner CHINA PETROLEUM & CHEM CORP
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