FOERFARANDE Foer FRAMSTAELLNING AV KITOSAN PRODUKTER OCH ANDRA FRAON SKAL AV ORGANISMER, ISYNNERHET FRAON SKAL AV HAVSORGANISMER.

摘要

The invention relates to a method of manufacture of chitosan and other products, such as chitin and proteins, from the shells of organisms, especially marine organisms, as a result of the reaction stages of deproteinization by alkaline solutions, demineralization by acidic solutions and deacetylation by concentrated alkaline solutions. The method comprises at least two successive stages of said three stages. The chitosan is manufactured so that in the shells of organisms, especially marine organisms, such as crabs or shrimps, are placed in a space in a reactor limited by a wall pervious to reaction liquids but retaining said shells of organisms. Thereafter they are subjected to a continuous action of reaction liquids, especially in a recirculation system flowing through the reactor and said space. After every reaction stage the solid product obtained is optionally washed by water using a continuous flow of water through the reactor to remove the residual reaction liquids. Thereafter the solid end product is optionally dried, preferably in an air flow at a temperature of 40-100 DEG C.