马占相思栲胶浓胶波美度与浓度换算关系及浸提、磺化工艺研究

研究了马占相思栲胶主要生产工序的工艺参数。结果得出：马占相思栲胶浓胶在20 ℃时的波美度（y，°Bé）与浓度（x，kg/L）的关系式为： y=1.2+40x。不同温度（T，℃）下，实测波美度（y’）换算为20 ℃时的波美度（y，°Bé）与温度的关系式为： y=y’+（T-20）/15；浸提工艺：马占相思树皮400 g，吸水率210%，头步加水1 200 mL，以后每步加水800 mL，浸提首罐温度100 ℃，尾罐温度128 ℃，浸提时间12 h，添加焦亚硫酸钠量助浸为气干原料质量的1.8%，栲胶得率为 81.9%，单宁得率为90.6%。磺化工艺：在 85 ℃下，添加焦亚硫酸钠（Na₂S₂O₅）量为栲胶绝干质量的6%，反应时间为 2 h，磺化后得栲胶产品的单宁含量为67.8%，不溶物为3.2%，pH值为4.5，总色度为9.6。其他工艺同杨梅栲胶生产工艺。

Extraction and Sulfonation Technology of Acacia mangium Tannin Extracts,and the Correlation Between Baume Degree of Tannin Extracts and Concentration

Acacia mangium tannin extract is a new tannin variety developed in recent years.The process parameters of A.mangium tannin extract are studied in this paper.The results show thas the relation of the baume degree（ y,° Bé） and concentration（ kg /L） at 20 ℃ is： y = 1.2 ＋ 40x.And the relation of the baume degree（ y） and concentration at different temperature（ y’） is： y = y’ ＋（ T- 20） /15.Extraction process was that 400 g of A.mangium barks with water absorption rate of210% were extracted with 1 200 mL water and then 800 mL of water in the following steps.First digestion extract temperature is100 ℃,and last digestion extract temperature is 128 ℃.The extract time is 12 h,sodium pyrosulfite which is 1.8% of gas dried materials weight is added.The yield of tannin extract is 81.9%,and the sield of tannins is 90.6%.Sulfonation process is that sodium pyrosulfite（ Na2S2O5） which is 6% of extract solution oven dried weight is added,and the reaction is carried on at 85 ℃for 2 h.The tannin content of sulphonated tannin extract is 67.8%,insoluble content is 3.2%,pH value is 4.5,and Lovibond color is 9.6.Other processes are the same as Waxberry tannin extracts production.