A process for continuously preparing 1,4-dioxyhexacyclic compound includes such steps as proportioning, internally heating for reaction and distillation, supplementing material, discharge, freeze crystallization, centrifugal or adsorptive drying and dissolving at ordinary temp.
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酸解玉米淀粉经过溶解及冷冻结晶后可形成B型淀粉微晶。
B-Type starch crystallites can be formed from dissolving and frozen-crystallizing the acid-hydrolyzed maize starch.
研究了从八角茴油中分离高纯度茴脑的生产工艺，探讨了冷冻结晶及精馏操作的最佳工艺条件。
The new separation technology of the high-purity anethole from star anise oil was studied, especially on the optimum separation conditions of freezing crystallization and vacuum rectification.
该文研究了在低温条件下，用乙醇作为溶剂，通过冷冻结晶去杂，从粗制大豆磷脂中精制磷脂酰胆碱的方法。
Method was introduced to refine phosphatidylcholine from rude soybean lecithin using alcohol and remove impurity by refrigerating crystal in the condition of low temperature.
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