Method for inhibiting generation of grease in alkaline tower

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 the butter suppression effect in the prior art is not good, which leads to the problems of easy blockage of the alkali washing tower and inconvenient operation, and a new method for inhibiting the production of butter in the alkali washing tower is provided

Method used

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  • Method for inhibiting generation of grease in alkaline tower

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The inhibitor is applied to the caustic scrubber of the ETO unit, where the molar composition of the materials entering the caustic scrubber is: ethylene 49.1%, water 50.25%, acetaldehyde 0.05%, ether 0.01%, C 3 + W hydrocarbon 0.58%, CO 2 0.01%. The lye temperature of the caustic washing tower is 45℃, and the concentration of lye (NaOH) is 10%. The inhibitor diethylenetriamine is continuously injected into the lye circulation line using a piston pump, and the injection concentration is 85ppm. After 30 days of operation, there is no blockage. The tower phenomenon occurs. The test method of GB8978-1996 was used to test the COD value of lye in 759 mg / L. The results are shown in Table 1.

Embodiment 2～12

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

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Abstract

The invention relates to a method for inhibiting generation of grease in an alkaline tower, and mainly solves the problems that the alkaline tower is easy to block and is inconvenient for operation caused by poor grease inhibiting effect in a conventional technology. The technical solution of the method solves the problems well by employing on-line continuously injecting inhibitor, wherein the inhibitor is at least one selected from diethylenetriamine, triethylenetetramine, tetraethylenepentamine, dipropylenetriamine, tripropylenetetramine, tetrapropylenepentamine. The method can be applied to alkaline towers of industrial apparatuses of preparing ethane from petroleum, preparing ethylene from ethanol, preparing alkene from methanol, and preparing propylene, vinyl acetate, dichloroethylene and epoxypropane from methanol, etc.

Description

Technical field [0001] The invention relates to a method for inhibiting the formation of butter in a caustic 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 recycling of unreacted materials, the flow from the reactor needs to go through a series of purification, separation and purification processes. In these industrial production processes, some acid impurities such as CO are inevitable 2 Wait. If these acidic substances are not removed, they will cause adverse effects in subsequent production. Therefore, it is necessary to alkali wash the reaction tail gas to remove the acidic CO 2 And so on, it is necessary to use a caustic washing tower with sodium hydroxide aqueous solution as the medium. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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