22: 19 molecular formula:

Molecular weight:

CASNo.:

Properties: The carboxyl group of acid is connected with aliphatic hydrocarbon group. According to the different aliphatic hydrocarbon groups, it can be divided into (1) saturated fatty acids (saturated

aliphatic

Acid), an acid containing saturated hydrocarbon groups. For example, HCOOH formate, CH3COOH acetate, CH3 (CH2) stearate16cooh palmitate CH3(CH2) 14COOH. ② Unsaturated fatty acids (unsaturated fatty acids)

aliphatic

Acid), an acid containing unsaturated hydrocarbon groups. For example, acrylic acid CH2=CHCOOH, oleic acid CH3 (CH2) 7ch = CH (CH2) 7cooh. (3) Cyclic acids (alicyclic

Carboxyl

Acid), and the carboxyl group is connected with a cyclic hydrocarbon group. For example, cyclohexane carboxylic acid C6H 1 1COOH. Triglycerides of many fatty acids are the main components of oils and fats, so they can be prepared from oils and fats by hydrolysis. It can also be synthesized artificially. Low carbon number is colorless liquid, with pungent smell and easy to dissolve in water. Carbon number is oily liquid, slightly soluble in water, and it smells of sweat. Those with high carbon number are solid and insoluble in water. Fatty acids can react with alkali to form salts and with alcohol to form esters. Used to make soap, synthetic detergent, lubricant and cosmetics.