Conversion of waste fish meat to bio-degradable plastics poly lactic acid by sub-critcal water oxidation

对鱼骨、鱼头、鱼肉、鱼内脏等亚临界水水解生产各种有机物质进行了研究。确定了每种产品的最佳反应。还研究了有机酸在离子交换树脂（DIAION WA30 和高孔壳聚糖树脂）中的吸附平衡和传质。通过对废鱼肉、内脏、鱼骨的转化研究，取得了以下显着成果：(1)从100吨鱼骨中，在473K下反应5分钟，提取0.64吨磷酸、0.44吨乳酸，然后提取25吨鱼骨、1.7吨焦谷氨酸、0.8吨丙氨酸、0.8吨丙氨酸、0.8吨乳酸。 543 K 亚临界水水解 20 分钟，得到甘氨酸、0.5 吨胱氨酸和 1.8 吨油。从100吨鱼头中可得到1.5吨鱼骨、0.23吨焦谷氨酸、0.07吨磷酸、4.9吨油和0.2吨脂肪。(2)油中含有宝贵且昂贵的不饱和脂肪酸，如DHA和EPA。(3)由于最佳反应温度取决于产品类型，因此可以形成在不同反应温度下连续生产不同产品的集成工艺。 (4)Langmuir方程很好地解释了乳酸在DIAION WA30离子交换剂和壳聚糖珠上的吸附等温线。(5)乳酸的颗粒内扩散通过固相和大孔扩散解释了并行传输。由于壳聚糖珠的吸附率远大于DIAION WA30，因此壳聚糖珠有利于有机酸的分离。

Production of various organic substances from fish bone, fish head, fish meat and fish entrails by sub-critical water hydrolysis was studied. Optimal reaction was determined for each product. Adsorption equilibrium and mass transfer of organic acid in ion exchange resins (DIAION WA30 and highly porous chitosan resin) were also studied. The following significant results were obtained from the research on conversion of waste fish meat, entrails, and bones.(1) From 100 ton fish bone, 0.64 ton of phosphoric acid, 0.44 ton of lactic acid was extracted by 5 min reaction at 473 K.Then, 25 ton of bone, 1.7 ton of pyroglutamic acid, 0.8 ton of alanine, 0.8 ton of glycine, 0.5 ton of cystine, and 1.8 ton of oil were obtained by sub-critical water hydrolysis at 543 K for 20 min. From 100 ton of fish head, 1.5 ton of bone, 0.23 ton of pyroglutamic acid, 0.07 ton of phosphoric acid, 4.9 ton of oil, and 0.2 ton of fat were obtained.(2) Oil contained valuable and expensive unsaturated fatty acids such as DHA and EPA.(3) Since optimal reaction temperature depends on the type of products, an integrated process which produce different product successively at different reaction temperature can be established.(4) Adsorption isotherm of lactic acid for DIAION WA30 ion exchanger and that for chitosan bead were well explained by Langmuir equation.(5) Intra-particle diffusion of lactic acid was explained parallel transport by solid-phase and macropore diffusion. Since adsorption rate of the chitosan bead was much larger than that of the DIAION WA30, the chitosan bead was favorable for separation of organic acids.