Production of fish meal and oil

摘要

Uncrushed fish material (including material from marine animals) in the form of whole fish or fragments of appreciable size is treated with formaldehyde or acetaldehyde to fix partially the solid constituents of the material and to release partially the liquids therefrom, the treated material is heated to fix further the solid constituents and release further the liquids, and then the liquids are expressed from the material and the oil is separated from the liquids. The aldehydes may be used in the form of their aqueous solutions. The material may be rendered neutral or slightly acid, for example by the addition of sulphuric, hydrochloric, or nitric acid before the addition of the aldehyde. The process may be conducted in the apparatus set forth in Specification 461,411. Specification 218,680, [Class 91], also is referred to.ALSO:Uncrushed fish material (including material from marine animals) in the form of whole fish or fragments of appreciable size is treated with formaldehyde or acetaldehyde to fix partially the solid constituents of the material and release partially the liquids therefrom, the treated material is heated to fix further the solid constituents and release further the liquids, and then the liquids are expressed from the material and the oil is separated from the liquids. The aldehydes may be used in the form of their aqueous solutions. The material may be rendered neutral or slightly acid, for example by the addition of sulphuric, hydrochloric or nitric acid, before the addition of the aldehyde. The process may be conducted in the apparatus set forth in Specification 461,411. Specification 218,680, [Class 5 (ii)], also is referred to.