申请人:——
公开号:US20030187308A1
公开(公告)日:2003-10-02
A process for production of 1,3-propanediol including the steps: (a) hydrating acrolein in the presence of an acid hydration catalyst; (b) catalytically hydrogenating the reaction mixture of step (a), which reaction mixture comprises 3-hydroxypropionaldehyde and is freed of unreacted acrolein; (c) refining the reaction mixture of step (b) containing water, 1,3-propanediol and the by-products boiling higher than 1,3-propanediol; and (d) treating 4-oxa-1,7-heptanediol to form 1,3-propanediol by (1) removing a boiler sump comprising 4-oxa-1,7-heptanediol from the refining step (c), (2) treating the boiler sump in an aqueous solution in the presence of an acid catalyst at about 200 to about 300° C. to form a solution comprising 1,3-propanediol, (3) neutralizing the solution obtained is step (2), and returning the neutralized solution from step (3) to the refining step (c). In addition, a process for splitting oligomeric water-soluble ether comprising: (a) treating an aqueous solution comprising oligomeric water-soluble ether in the presence of homogeneous acid catalyst at a temperature of from about 200 to about 300 ° C. to form the monomer of the oligomeric water-soluble ether; and (b) neutralizing the solution obtained in step (a),
生产1,3-丙二醇的过程包括以下步骤:(a) 在酸性水合催化剂存在下水合丙烯醛;(b) 在步骤(a)的反应混合物中进行催化加氢,该反应混合物包括3-羟基丙醛并且除去未反应的丙烯醛;(c) 精制步骤(b)的反应混合物,其中包含水、1,3-丙二醇和沸点高于1,3-丙二醇的副产物;以及(d) 通过处理4-氧杂-1,7-庚二醇来形成1,3-丙二醇,方法为:(1) 从精制步骤(c)中去除包含4-氧杂-1,7-庚二醇的锅炉底液,(2) 在酸性催化剂存在下,在约200至约300°C的水溶液中处理锅炉底液以形成包含1,3-丙二醇的溶液,(3) 中和步骤(2)中获得的溶液,并将从步骤(3)中中和的溶液返回到精制步骤(c)。此外,还包括一种分解寡聚水溶性醚的过程,包括:(a) 在均相酸性催化剂存在下处理含有寡聚水溶性醚的水溶液,在约200至约300°C的温度下形成寡聚水溶性醚的单体;以及(b) 中和步骤(a)中获得的溶液。