The block polyether demulsifier prepared by ring-opening polymerization of ethylene oxide and propylene oxide under high temperature and high pressure is the most widely used demulsifier for water in crude oil emulsion. It has the high synthesis risk and cost. Therefore, the development of non-block polyether demulsifier has attracted more and more attention. In this article, a new type of demulsifier was sythesized by radical polymerization of acrylate and cationic monomer. It was found that the copolymer PMA-co-PDBC of methyl acrylate (MA) and benzyldimethyl [2-[(1-oxoallyl)oxy] ethyl] ammonium chloride (DBC) synthesized in the mixed solvent of dipropylene glycol methyl ether and water had a good performance. When dosage of PMA-co-PDBC was 200 mg/L, the dehydration rate of water in crude oil emulsion with 50% water content can reach 80% at 80 C within 4 h. Structural and interface properties analysis presented that PMA-co-PDBC had a microblock structure similar with block polyether and it can effectively reduce the strength of W/O interfacial film to realize the demulsification. Although the demulsification performance of PMA-co-PDBC was not better than block polyether, its preparation safety and cost are much better. The results of this article can provide a new option for the development of crude oil demulsifier.
The development of a new crude oil emulsion demulsifier to replace the block polyether has always attracted attention. In this article, a novel crude oil emulsion demulsifier was prepared by dispersion polymerization using a mixture of ether and water as the dispersion medium and acrylate, methacryloxyethylthrimethyl ammonium chloride (DMC), and acrylamide as the comonomers. Taking the stability and demulsification performance as the index, the effects of acrylate type, ether/water mass ratio, monomer mass ratio, monomer concentration, initiator type, ether type, and reaction temperature on the polymerization results were investigated. The experimental results showed that when the acrylate was butyl acrylate (BA), the mass ratio of BA to DMC was 1:1, and dispersion medium was the mixture of dipropylene glycol methyl ether and water (ether/water mass ratio 1.5:1), monomer concentration was 20 wt%, initiator was V50, reaction temperature was in range of 50 to 55 C, and polymerization reaction was 10 h, the product P (BA-DMC-AM) had a good demulsification performance for the crude oil emulsion (crude oil density 0.9625 g/cm 3 , water
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