The present invention relates to a method of manufacturing a paste-like composition including performing decarboxylative dimerization with respect to a fatty acid composition in which a fatty acid is composed such that (1) the amount of a branched-chain fatty acid is equal to or greater than 70 % by mass to a total mass of a total fatty acids, (2) the amount of a liquid type branched-chain fatty acid having a carboxylic acid at 25℃ is equal to or less than 65% by mass to a total mass of a total fatty acids, and (3) the content ratio of a liquid type branched-chain fatty acid having two or three carboxylic acids at 25℃ to a total mass of the branched-chain fatty acid is equal to or greater than 10 % by mass； and then performing a hydrogenation and deoxidation reaction to an obtained aliphatic ketone. According to the present invention, it is possible to provide a hydrocarbon composition and a method of manufacturing thereof, the hydrocarbon composition having a decreased amount of impurities excluding desired components； having excellent preservation stability, slipperiness (smoothness) during application, gloss after application, stability under light irradiation, lubricity, and release characteristics； and placing minimal burden on the environment, in comparison with an existing hydrocarbon composition.本發明係有關於一種糊狀組成物之製造方法，其特徵在於：對脂肪酸組成物進行脫碳酸的二聚化反應之後，對所得到的脂肪族酮進行氫化脫氧反應，其中該脂肪酸組成物之脂肪酸組成係(1)相對於總脂肪酸的合計質量，分枝鏈脂肪酸之含量為70質量%以上，(2)相對於總脂肪酸的合計質量，具有1個羧酸之於25℃為液狀的分枝鏈脂肪酸之含量為65質量%以下，且(3)相對於分枝鏈脂肪酸的合計質量，具有2或3個羧酸之於25℃為液狀的分枝鏈脂肪酸之含有比率為10質量%以上。依照本發明，能夠提供一種烴組成物及其製造方法，該烴組成物相較於既有的烴組成物，能夠減低目標成分以外的夾雜物含量，且保存安定性、塗布時的滑性(滑溜度)、塗布後的光澤、在光照射下之安定性、潤滑性及脫模性優異，而且能夠減低環境負荷。
