Synthesis and characterization of PBTCA‐modified hyperbranched polyether corrosion and scale inhibitors

Abstract

In this study, hyperbranched polyether (HBP) with terminal hydroxyl was synthesized from tetrahydrofuran and glycidol by cationic open-loop polymerization and then modified by 2-phosphono-butane-1,2,4-tricarboxylic acid to introduce carboxyl and phosphorus to improve corrosion and scale inhibition. The structure of the products (HBPs) was determined by FTIR and 1 H-NMR. The scale inhibition efficiency (E) of calcium carbonate and calcium sulfate reached 99.74 and 97.10% at a concentration of 20 mg/L. X-ray diffraction and scanning electron microscopy were used to examine crystal type and morphology. The addition of scale inhibitors can inhibit the growth of the calcium scale crystal and destroy the crystal structure. The corrosion inhibition rate of HBPs can reach 72.98% when dosage was 150 mg/L. Polarization curve showed that HBPs was a kind of mixed corrosion inhibitor. The adsorption of HBPs on the surface of carbon steel conformed to Langmuir adsorption, which formed physical adsorption film and inhibited the corrosion process.

Environmentally Friendly Phosphonated Polyetheramine Scale Inhibitors—Excellent Calcium Compatibility for Oilfield Applications

“…Recently, our group has developed a new class of modified aliphatic polycarbonates (PCA–COOH and PCA–PO 3 H 2 –COOH) as environmentally friendly oilfield SIs for carbonate and sulfate scales (Figure ). Also, Wang et al have synthesized a series of 2-phosphono-butane-1,2,4-tricarboxylic acid (PBTCA)-modified hyperbranched polyethers as biodegradable corrosion and scale inhibitors . Furthermore, Liu et al have reported a polyether copolymer as an environmentally friendly scale and corrosion inhibitor …”

“…16 Also, Wang et al have synthesized a series of 2-phosphono-butane-1,2,4tricarboxylic acid (PBTCA)-modified hyperbranched polyethers as biodegradable corrosion and scale inhibitors. 17 Furthermore, Liu et al have reported a polyether copolymer as an environmentally friendly scale and corrosion inhibitor. 18 Polyethers are polymers that contain the C−O−C linkage, as shown in Figure 2.…”

A modified oil‐soluble polyether used as multifunctional ashless additives with enhanced lubricating and corrosion protection performance

“…According to the thermodynamic principle, lower E corr means a greater corrosion tendency. In terms of corrosion kinetics, the larger the I corr , the faster the corrosion reaction 21 …”

“…In terms of corrosion kinetics, the larger the I corr , the faster the corrosion reaction. 21 As shown in Figure 13 and Table 6, the cathodic polarization curves of the three test samples are parallel to each other, so it can be known that the corrosion resistance of the tested samples is mainly controlled by anode. Since there are two passivation regions in the polarization curve, 22 it can be inferred that the sample has a certain degree of selfrepair, 23 which can further play the role of corrosion inhibition.…”

Synthesis of a New Type of 2-Phosphonobutane-1,2,4-tricarboxylic-Acid-Modified Terpolymer Scale Inhibitor and Its Application in the Oil Field

“…5 in high-temperature, high-hardness, and high-alkali environments. 17,18 Therefore, in this paper, hydroxypropyl acrylate (HPA) was modified by the PBTCA molecule and then polymerized with allyl polyethoxyammonium sulfonate (APES). The product (AA−APES−HPAY) has a carboxyl group, sulfonic acid group, and ether bonds as well as a low phosphorus content.…”