A kind of highly functional amphiphilic copolymer crude oil metal chelating agent and preparation method thereof

Abstract

The invention relates to a high-functionality-degree amphiphilic copolymer metal chelating agent for crude oil and a preparing method thereof. The metal chelating agent has good removing effects on calcium, iron, nickel, vanadium, and other metals in crude oil, and is prepared by subjecting carboxymethyl chitosan, N-isopropylacrylamide and an allyl sulfonic acid type monomer to graft copolymerization. The general structure formula of the metal chelating agent is shown in the specification, wherein R is -H or -CH3, the number m of repeat units is 100-1000, the polymerization degree x is 2-500, and the polymerization degree y is 2-500. According to the metal chelating agent, through molecule designing and structure control of polymerization monomers and the copolymer, a green synthetic process in which graft copolymerization is initiated by microwave assistance is adopted, integration and synergistic effects of a plurality of functional groups such as amino, acylamino, carboxyl, hydroxy, a sulfonic acid group, an ether group and isopropyl are achieved, and the functionality degree and hydrophilic-lipophilic amphipathicity of the metal chelating agent are effectively improved. The calcium removing rate for crude oil is 80% or above, the iron removing rate is 75% or above, the nickel removing rate is 30% or above, and the vanadium removing rate is 35% or above.

Description

technical field [0001] The invention relates to a high-functionality amphiphilic copolymer crude oil metal chelating agent and a preparation method thereof, which are suitable for removing calcium, iron, nickel, vanadium and other metals in crude oil. Background technique [0002] In recent years, with the continuous growth of global oil consumption and the depletion of conventional crude oil resources, people began to focus on unconventional crude oil that is difficult to process but has relatively large reserves. However, the metal content in unconventional crude oil is high. These metals are mainly calcium, iron, nickel, and vanadium. They will damage the catalysts in the catalytic cracking and catalytic hydrogenation processes in the petroleum refining process, and have serious harmful effects. Calcium and iron in crude oil mainly exist in the form of naphthenate and phenoxide; while nickel and vanadium mainly exist in the structure of porphyrin compounds, and their stru...

AI Technical Summary

Problems solved by technology

Inorganic acids have a strong corrosive effect on equipment and are gradually being replaced; organic carboxylic acid demetallizers have a better effect on the removal of calcium and iron, but the removal rate of nickel and vanadium is very low; The removal effect of various metals is good, but it is easy to cause eutrophication of water body, which does not meet the requirements of environmental protection

Chinese patents CN87105863A and CN1657594A use hydroxycarboxylic acid, monocarboxylic acid, dicarboxylic acid and amino acid as chelating agents, which have a certain decalcification effect, but contain a single functional group and have poor removal effect on nickel and vanadium; Chinese patents CN102816586A and CN102443422 B The published chelation removal method uses phosphorus-containing compounds such as phosphoric acid, trimethyl phosphate, and dimethyl phosphite as chelating agents, and has a good removal effect on nickel and vanadium, but the removal agent contains phosphorus, which does not meet environmental protection requirements

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