According to the supply of stearic acid (octadecanoic acid), the differences in model and grade classification between domestic stearic acid and imported stearic acid are as follows:
1 , Domestic stearic acid model and grade classification:
Domestic model differences: Type 200 is a first-class product, and Type 400 is a second-class product. Type 800 is a third-grade product.
Types 200, 400, and 800 are the original domestic standards, mainly based on To distinguish based on iodine value, usually the lower the better, corresponding to iodine values of 2cg/g, 4cg/g, and 8cg/g respectively. Nowadays, the iodine value of most stearic acid is controlled to be less than 1cg/g, or even less than 0.5. In addition to palm oil, the raw materials of stearic acid also include beef and sheep oil, lard, cottonseed oil, gutter oil, acidified oil and other fats. Usually type 800 stearic acid is produced from beef and mutton fat. Its C18 content is approximately 60-68%.
2. Imported stearic acid model and grade classification:
Differences in imported models: 1801 is a first-grade product, 1820, 1825, etc. are second-grade products, 1810 is a third-grade product, and 1865 is a special grade product.
In addition, imported stearic acid model products include 1803, 1805, 1806, 1809, 1806, 1835, 1836, 1837, 1839, 1840, 1841, 1842 , 1845, 1850, 1855, 1865, 1870, 1885, 1895, 1896.
The 18 mainly refers to C18 stearic acid in stearic acid, This is an important indicator of stearic acid. Generally, the stearic acid obtained by direct hydrogenation-hydrolysis of industrial palm oil usually has a C18 content of 38-42%. Through fractionation, stearic acid with a higher C18 content can be obtained. Fatty acid also produces stearic acid with low C18 content (mainly C16). The higher the C18 content, the higher the price. The higher the C16 content, the lower the price. Of course, high purity (>98%) is excluded. �
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