パラジウム触媒によるトールロジンの不均斉化反応
スポンサーリンク
概要
- 論文の詳細を見る
Hays, Ball and their co-workers proposed the following equation for estimation of the content of abietic acid in disproportionated product.<BR>Abietic acid %=α<SUB>241</SUB>-α<SUB>248.5</SUB>/27.5×100<BR>where;α<SUB>241</SUB> and α<SUB>248.5</SUB> are the specific adsorption coeffici-ents at 241 mμ and 248.5 mμ respectively. <BR>When disproportionation of tall rosin was carried out using active carbon catalyst only, experiments showed that the content of abietic acid from upper equation was influenced by the unsaponifiable matter. <BR>Because α<SUB>241</SUB> of the unsaponifiable matter was much larger than α<SUB>248.5</SUB>, and the extinction coefficient of disproportionated product was increased as a whole by the unsaponifiable matter. But, in disproportionation with Pd-catalyst, the content of abietic acid was scarecely influenced by the unsaponifiable matter, because α<SUB>241</SUB>-α<SUB>248.5</SUB> was very small. The saponifiable component, which is scarcely soluble in iso-octane was produced in a certain reaction condition of disproportionation. This component having the maximum extinction coefficient at 250 mμ makes larger the extinction coefficient of disproportionated product as a whole, but has influenced little on equation for estimation of content of abietic acid. <BR>The disproportionation of tall rosin with Pd-catalyst was investigated. The active carbon was the best as carrier and 1 part of Pd to about 100 parts of active carbon was suitable ratio. The more catalysts, the lower temperature or the shorter reaction time at the advancing reaction, the larger activity of the recovered catalysts were achieved. In the cyclic reuse of the recovered catalysts, the required amount of the catalysts was about 0.25 % (2 cycles with 0.5%) in the average. In the additional use of catalyst, mixed use of new additional catalyst with the recovered was more effective than that in which the recovered catalyst was used at first and then new catalyst was subsequently added. The requirement of the catalysts were about 0.13% and 0.2% in the average for the former system and the latter respectively.
- 日本油化学会の論文
著者
関連論文
- エピクロルヒドリンの加水分解におけるアルカリ水溶液のpHの影響 : エピクロルヒドリン誘導体に関する研究 (第3報)
- エピクロルヒドリン誘導体に関する研究 (第9報) : グリシジルエステルの合成法 (その1)
- エピクロルヒドリン誘導体に関する研究 (第8報) : ポリグリセリンの直接合成法
- エピクロルヒドリンの加水分解における素反応について : エピクロルヒドリン誘導体に関する研究 (第2報)
- 水酸化ナトリウムによるエピクロルヒドリンの加水分解 : エピクロルヒドリン誘導体に関する研究 (第1報)
- 不均斉化ロジンのカリウムセッケンの性状がスチレン-ブタジエンの乳化重合に及ぼす影響
- 活性炭を触媒とするトールロジンの不均斉化反応
- アルキルケテンダイマーに関する研究-4-
- 水素気流下におけるトールロジンの不均斉化反応
- トールロジンの不均斉化反応における各種触媒の効果
- アルキルケテンダイマーに関する研究-5-
- アルキルケテンダイマーに関する研究-2-
- モノメチルアミンによるアルキルケテンダイマーの定量
- パラジウム触媒によるトールロジンの不均斉化反応
- アルキルケテンダイマーに関する研究-6-
- アルキルケテンダイマーに関する研究-3-