Light-colored low-phosphorous dimer acid production process

Abstract

The invention relates to a light-colored low-phosphorous dimer acid production process, which comprises the steps of: performing polymerization, namely successively adding high-purity distilled water and an acidic kaolin catalyst, and carrying out heating and pressure polymerization; performing acidification and filtration, namely carrying out filtration after acidification, adding high-purity water, heating and stirring, standing, discharging open water, and separating and filtering in a high speed centrifuge; performing molecular distillation (continuous distillation), namely continuously adding crude dimer acid in a film evaporator in multistage Roots high vacuum, removing low boiling point substances and moisture in the materials, and putting in a short-range evaporator so as to distill off the dimer acid and monomer fatty acid; and washing with water, namely, washing the generated dimer acid with ultrapure water so as to obtain the light-colored low-phosphorous dimer acid. Therefore, the process solves the problem that the dimer acid product is low in color and luster as well as transparency. The light-colored low-phosphorous dimer acid production process has the characteristics of high production yield and low energy consumption, improves the color and luster as well as transparency of the dimer acid product, reduces the using amount of the catalyst, improves the yield of the dimer acid, and makes the iron and phosphorous ion content of the dimer acid reduced below 10ppm.

Description

technical field [0001] The invention relates to a production process of light-colored low-phosphorus dimer acid. Background technique [0002] The polymer synthesized by dimer acid, an extended product of oleic acid, has excellent softness, sealing, water resistance and rust resistance, and is widely used in machinery, automobiles, electronics, aerospace, ships, textiles, daily chemicals, coatings, etc. It has been widely used in many industries, and its application fields have been continuously expanded, and it has become an indispensable and important raw material for modern industry. The production of dimer acid in our country began in the 1990s. Up to now, several production enterprises have adopted kettle-type vacuum distillation. This technology is relatively backward, and it is easy to produce polymers. The output is small and the quality is poor. It has not been widely used as a commodity. Going to the market, most of them are self-produced and used for the producti...

AI Technical Summary

Problems solved by technology

The production of dimer acid in our country began in the 1990s. Up to now, several production enterprises have adopted kettle-type vacuum distillation. This technology is relatively backward, and it is easy to produce polymers. The output is small and the quality is poor. It has not been widely used as a commodity. Going to the market, most of them are self-produced and used for the production of low-end polyamide products

Although some scientific research institutions have carried out research and development and made some breakthroughs, they have not yet fully entered industrial production and cannot meet the market's requirements for high-quality and high-purity dimer acid.

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