Method for preparing iso-octyl palmitate

Abstract

The invention relates to a method for preparing iso-octyl palmitate shown in the formula (III), which comprises the following steps: in the nitrogen atmosphere, making palmitic acid shown in the formula (I) and isooctyl alcohol shown in the formula (II) react with a solid-acid catalyst for 2 to 6 hours at a temperature of between 100 and 180 DEG C; using a water segregator to add a water-carrying agent to carry out water carrying in the reaction process; and carrying out post-treatment on reaction solution after the reaction is finished to obtain the iso-octyl palmitate shown in the formula (III), wherein an amount-of-substance ratio of the total charging of the palmitic acid and the isooctyl alcohol is 1:1-4, the solid-acid catalyst is stannous oxalate, SO42- / ZrO2-Al2O3 or SO42- / TiO2-SnO2-Al2O3, and the usage of the solid-acid catalyst is 1 to 5 percent of the total charging mass of the palmitic acid and the isooctyl alcohol. The invention has the advantages of mild reaction condition, adoption of solid acid serving as the catalyst, reusable property, low equipment investment and operation cost and the like.

Description

(1) Technical field [0001] The invention relates to a method for preparing isooctyl palmitate, in particular to a method for preparing isooctyl palmitate by using a solid acid as a catalyst, and stannous oxalate is particularly recommended as a solid acid catalyst to prepare isooctyl palmitate. (2) Background technology [0002] Isooctyl palmitate, the solution is transparent and has no peculiar smell. It can be miscible with vegetable oil or mineral oil. It is not easy to oxidize, does not change color, and has good stability. Irritant, non-ionic surfactant that does not produce allergic reactions. [0003] The skin has a good absorption of isooctyl palmitate, and can closely contact with the hair follicles in the cortex, penetrate deep into the cortex, and bring the active ingredients into it, so as to fully exert the effect of the active ingredients. Adding isooctyl ester to cosmetics (the dosage is 2% to 5%) can make the product evenly spread on the skin, making the ski...

AI Technical Summary

Problems solved by technology

[0004] At present, most of the existing manufacturers of isooctyl palmitate in my country use concentrated sulfuric acid as a catalyst. Although concentrated sulfuric acid has ideal catalytic activity as an esterification catalyst, it has the following disadvantages: (1) concentrated sulfuric acid is strong in acidity, and during the production process The equipment is seriously corroded, which leads to frequent equipment replacement and increased production costs; (2) concentrated sulfuric acid has strong oxidative properties, resulting in alcohol dehydration to generate ether and coke, which affects product quality; (3) a large amount of waste acid and waste water pollution are generated during the production process environment; (4) concentrated sulfuric acid can not be recycled as a catalyst, which increases the production cost accordingly; (5) concentrated sulfuric acid is not easy to separate from the product, the post-treatment process is complicated, and the product cost increases

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