Preparation method of ethidene diamine type polyether demulsifying agent

An ethylenediamine type, polyether technology, applied in the field of preparation of demulsifier, to achieve the effect of good broad-spectrum and ideal dehydration effect

Active Publication Date: 2011-05-18
JURONG NINGWU CHEM
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Problems solved by technology

[0003] In order to overcome the problems existing in the existing polyether demulsifiers, the object of the present invention is to provide a preparation method of ethylenediamine polyether demulsifiers. On the basis of preparing the poly...

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Embodiment Construction

[0017] The following further describes the present invention through specific embodiments, but the embodiments are not a limitation of the present invention.

[0018] A preparation method of ethylenediamine type polyether demulsifier includes the following steps:

[0019] ①Synthesis of polyether demulsifier A: 50 grams of ethylenediamine and 35 grams of potassium hydroxide are added to the reactor, heated to increase the temperature, and 5063 grams of propylene oxide are introduced, the temperature is controlled at 115~165℃, and the pressure is maintained below 0.6MPa , And make the first stage fully react, vacuum for 1 hour. Then 3200 grams of ethylene oxide was introduced, the temperature was controlled at 115-165°C, the pressure was maintained below 0.3 MPa, and the reaction was fully carried out, and vacuum was applied for 1 hour. Then pass in 1687 propylene oxide, control the temperature at 115-165°C, maintain the pressure below 0.3 MPa, and make it undergo the second stage f...

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Abstract

The invention discloses a preparation method of ethidene diamine type polyether demulsifying agent. The ethidene diamine type polyethers demulsifying agent is prepared by that ethidene diamine serving as a raw material is subjected to crosslinking modification after reacting with ethylene oxide and epoxypropane. The preparation method comprises the following steps: in the presence of base catalyst, causing the ethidene diamine serving as an initiator to react with propylene oxide and ethylene oxide to prepare polyethers demulsifying agent A by two stages; then, in the presence of catalyst, carrying out selfcrosslinking reaction on the polyethers demulsifying agent A by utilizing polycarboxylic acid, thus preparing a product B; and finally, carrying out selfcrosslinking reaction on the polyethers demulsifying agent A and the product B by toluene diisocynate in the solvent, thus preparing the final product of the ethidene diamine type polyethers demulsifying agent. The demulsifying agent prepared by the preparation method has the advantages of higher relative molecular weight, ideal dehydration effect, good broad spectrum and small use amount, and is suitable for demulsifying and dehydrating crude oil in oil fields, and the removed water has good quality.

Description

Technical field [0001] The invention relates to a method for preparing a demulsifier, in particular to a method for preparing an ethylenediamine type polyether demulsifier. Background technique [0002] Moisture is often mixed in the oil extraction process, and the crude oil must be dehydrated before it is transported to reduce transportation costs. The free water in crude oil is easy to separate and remove, while the removal of emulsified water in crude oil generally requires the addition of demulsifiers. At present, polyether demulsifiers are mainly used in China, and most of these demulsifiers contain active The hydrogen compound is the initiator, and it undergoes anionic ring-opening polymerization reaction with the olefin oxide under the action of the alkali metal catalyst to prepare the polyoxyethylene polyoxypropylene ether demulsifier. This process has many side reactions in the preparation of higher molecular weight polyethers, the prepared polyethers have a relatively ...

Claims

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Application Information

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IPC IPC(8): C08G18/50C08G65/26C08G65/332C10G33/04
Inventor 应珏翟洪金应军
Owner JURONG NINGWU CHEM
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