Preparation method of hydrogenated dimer acid

Abstract

The invention discloses a preparation method of hydrogenated dimer acid. The preparation method comprises the following steps: adding cottonseed oil fatty acid, dimethyl formamide, deionized water, sodium carbonate and a catalyst into a reaction still, introducing nitrogen, carrying out heating and pressurization, stirring for 3 to 4 h, adding a phosphoric acid solution, stirring, then warming, gradually reducing pressure inside the reaction still, discharging water vapor, when the pressure is decreased to be 1 atm, stopping heating, and standing for cooling; then adding the solution into a molecular still, adjusting the vacuum degree, and collecting residual liquid inside the molecular still 1 to 2 h later; adding the residual liquid into a high pressure still, adding the solvent and thecatalyst in sequence, introducing hydrogen, adjusting pressure and temperature, and stirring until the iodine value is smaller than or equal to 8 g per 100 g so as to obtain the hydrogenated dimer acid. The hydrogenated dimer acid prepared by the method has the character high dimer content, low in color and luster, low in iodine value, high in flash pint, high ignition point and high heat stability, and can be widely applied to mineral oil additives, surface active agents, waterproof agents, rocket propellants and the like.

Description

technical field [0001] The invention relates to the field of dimer acid preparation, in particular to a method for preparing hydrogenated dimer acid. Background technique [0002] Dimer acid, whose molecular formula is C 36 h 64 o 4 , usually refers to dimer fatty acid, which is mainly obtained by polymerization of 18-carbon unsaturated fatty acid. Dimer acid is an important chemical raw material, which is widely used in the fields of surfactants, adhesives, oil additives and new materials. The research on dimer acid abroad began at the beginning of the 20th century, and the earliest dimer acid patent was registered in England in 1918. However, it is known that the industrial production of dimer acid began in the early 1940s. At that time, it was mainly for the development of synthetic rubber to replace the scarce natural rubber in World War II. Our country started the research and development of dimer acid in 1984, but the development is very slow. At present, there ar...

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Problems solved by technology

European and American countries began research as early as the 1960s. At present, the Netherlands, Japan and other countries have industrialized. my country cannot produce large-scale production. It can only produce ordinary unsaturated dimer acid, which is only suitable for low-grade inks and other products. The added value is not high. High, only further processing can increase its value

At present, some institutions have begun to study the preparation of hydrogenated dimer acid, but often the prepared hydrogenated dimer acid has low dimer content, low flash point, low ignition point, deep color, and high iodine value, which is not suitable for the preparation of high-grade polymeric acid. Amide resin, lubricating oil, polyester resin, etc.

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